ReleaseNotes 279 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050105110521053105410551056105710581059106010611062106310641065106610671068106910701071107210731074107510761077107810791080108110821083108410851086108710881089109010911092109310941095109610971098109911001101110211031104110511061107110811091110111111121113111411151116111711181119112011211122112311241125112611271128112911301131113211331134113511361137113811391140114111421143114411451146114711481149115011511152115311541155115611571158115911601161116211631164116511661167116811691170117111721173117411751176117711781179118011811182118311841185118611871188118911901191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260126112621263126412651266126712681269127012711272127312741275127612771278127912801281128212831284128512861287128812891290129112921293129412951296129712981299130013011302130313041305130613071308130913101311131213131314131513161317131813191320132113221323132413251326132713281329133013311332133313341335133613371338133913401341134213431344134513461347134813491350135113521353135413551356135713581359136013611362136313641365136613671368136913701371137213731374137513761377137813791380138113821383138413851386138713881389139013911392139313941395139613971398139914001401140214031404140514061407140814091410141114121413141414151416141714181419142014211422142314241425142614271428142914301431143214331434143514361437143814391440144114421443144414451446144714481449145014511452145314541455145614571458145914601461146214631464146514661467146814691470147114721473147414751476147714781479148014811482148314841485148614871488148914901491149214931494149514961497149814991500150115021503150415051506150715081509151015111512151315141515151615171518151915201521152215231524152515261527152815291530153115321533153415351536153715381539154015411542154315441545154615471548154915501551155215531554155515561557155815591560156115621563156415651566156715681569157015711572157315741575157615771578157915801581158215831584158515861587158815891590159115921593159415951596159715981599160016011602160316041605160616071608160916101611161216131614161516161617161816191620162116221623162416251626162716281629163016311632163316341635163616371638163916401641164216431644164516461647164816491650165116521653165416551656165716581659166016611662166316641665166616671668166916701671167216731674167516761677167816791680168116821683168416851686168716881689169016911692169316941695169616971698169917001701170217031704170517061707170817091710171117121713171417151716171717181719172017211722172317241725172617271728172917301731173217331734173517361737173817391740174117421743174417451746174717481749175017511752175317541755175617571758175917601761176217631764176517661767176817691770177117721773177417751776177717781779178017811782178317841785178617871788178917901791179217931794179517961797179817991800180118021803180418051806180718081809181018111812181318141815181618171818181918201821182218231824182518261827182818291830183118321833183418351836183718381839184018411842184318441845184618471848184918501851185218531854185518561857185818591860186118621863186418651866186718681869187018711872187318741875187618771878187918801881188218831884188518861887188818891890189118921893189418951896189718981899190019011902190319041905190619071908190919101911191219131914191519161917191819191920192119221923192419251926192719281929193019311932193319341935193619371938193919401941194219431944194519461947194819491950195119521953195419551956195719581959196019611962196319641965196619671968196919701971197219731974197519761977197819791980198119821983198419851986198719881989199019911992199319941995199619971998199920002001200220032004200520062007200820092010201120122013201420152016201720182019202020212022202320242025202620272028202920302031203220332034203520362037203820392040204120422043204420452046204720482049205020512052205320542055205620572058205920602061206220632064206520662067206820692070207120722073207420752076207720782079208020812082208320842085208620872088208920902091209220932094209520962097209820992100210121022103210421052106210721082109211021112112211321142115211621172118211921202121212221232124212521262127212821292130213121322133213421352136213721382139214021412142214321442145214621472148214921502151215221532154215521562157215821592160216121622163216421652166216721682169217021712172217321742175217621772178217921802181218221832184218521862187218821892190219121922193219421952196219721982199220022012202220322042205220622072208220922102211221222132214221522162217221822192220222122222223222422252226222722282229223022312232223322342235223622372238223922402241224222432244224522462247224822492250225122522253225422552256225722582259226022612262226322642265226622672268226922702271227222732274227522762277227822792280228122822283228422852286228722882289229022912292229322942295229622972298229923002301230223032304230523062307230823092310231123122313231423152316231723182319232023212322232323242325232623272328232923302331233223332334233523362337233823392340234123422343234423452346234723482349235023512352235323542355235623572358235923602361236223632364236523662367236823692370237123722373237423752376237723782379238023812382238323842385238623872388238923902391239223932394239523962397239823992400240124022403240424052406240724082409241024112412241324142415241624172418241924202421242224232424242524262427242824292430243124322433243424352436243724382439244024412442244324442445244624472448244924502451245224532454245524562457245824592460246124622463246424652466246724682469247024712472247324742475247624772478247924802481248224832484248524862487248824892490249124922493249424952496249724982499250025012502250325042505250625072508250925102511251225132514251525162517251825192520252125222523252425252526252725282529253025312532253325342535253625372538253925402541254225432544254525462547254825492550255125522553255425552556255725582559256025612562256325642565256625672568256925702571257225732574257525762577257825792580258125822583258425852586258725882589259025912592259325942595259625972598259926002601260226032604260526062607260826092610261126122613261426152616261726182619262026212622262326242625262626272628262926302631263226332634263526362637263826392640264126422643264426452646264726482649265026512652265326542655265626572658265926602661266226632664266526662667266826692670267126722673267426752676267726782679268026812682268326842685268626872688268926902691269226932694269526962697269826992700270127022703270427052706270727082709271027112712271327142715271627172718271927202721272227232724272527262727272827292730273127322733273427352736273727382739274027412742274327442745274627472748274927502751275227532754275527562757275827592760276127622763276427652766276727682769277027712772277327742775277627772778277927802781278227832784278527862787278827892790279127922793279427952796279727982799280028012802280328042805280628072808280928102811281228132814281528162817281828192820282128222823282428252826282728282829283028312832283328342835283628372838283928402841284228432844284528462847284828492850285128522853285428552856285728582859286028612862286328642865286628672868286928702871287228732874287528762877287828792880288128822883288428852886288728882889289028912892289328942895289628972898289929002901290229032904290529062907290829092910291129122913291429152916291729182919292029212922292329242925292629272928292929302931293229332934293529362937293829392940294129422943294429452946294729482949295029512952295329542955295629572958295929602961296229632964296529662967296829692970297129722973297429752976297729782979298029812982298329842985298629872988298929902991299229932994299529962997299829993000300130023003300430053006300730083009301030113012301330143015301630173018301930203021302230233024302530263027302830293030303130323033303430353036303730383039304030413042304330443045304630473048304930503051305230533054305530563057305830593060306130623063306430653066306730683069307030713072307330743075307630773078307930803081308230833084308530863087308830893090309130923093309430953096309730983099310031013102310331043105310631073108310931103111311231133114311531163117311831193120312131223123312431253126312731283129313031313132313331343135313631373138313931403141314231433144314531463147314831493150315131523153315431553156315731583159316031613162316331643165316631673168316931703171317231733174317531763177317831793180318131823183318431853186318731883189319031913192319331943195319631973198319932003201320232033204320532063207320832093210321132123213321432153216321732183219322032213222322332243225322632273228322932303231323232333234323532363237323832393240324132423243324432453246324732483249325032513252325332543255325632573258325932603261326232633264326532663267326832693270327132723273327432753276327732783279328032813282328332843285328632873288328932903291329232933294329532963297329832993300330133023303330433053306330733083309331033113312331333143315331633173318331933203321332233233324332533263327332833293330333133323333333433353336333733383339334033413342334333443345334633473348334933503351335233533354335533563357335833593360336133623363336433653366336733683369337033713372337333743375337633773378337933803381338233833384338533863387338833893390339133923393339433953396339733983399340034013402340334043405340634073408340934103411341234133414341534163417341834193420342134223423342434253426342734283429343034313432343334343435343634373438343934403441344234433444344534463447344834493450345134523453345434553456345734583459346034613462346334643465346634673468346934703471347234733474347534763477347834793480348134823483348434853486348734883489349034913492349334943495349634973498349935003501350235033504350535063507350835093510351135123513351435153516351735183519352035213522352335243525352635273528352935303531353235333534353535363537353835393540354135423543354435453546354735483549355035513552355335543555355635573558355935603561356235633564356535663567356835693570357135723573357435753576357735783579358035813582358335843585358635873588358935903591359235933594359535963597359835993600360136023603360436053606360736083609361036113612361336143615361636173618361936203621362236233624362536263627362836293630363136323633363436353636363736383639364036413642364336443645364636473648364936503651365236533654365536563657365836593660366136623663366436653666366736683669367036713672367336743675367636773678367936803681368236833684368536863687368836893690369136923693369436953696369736983699370037013702370337043705370637073708370937103711371237133714371537163717371837193720372137223723372437253726372737283729373037313732373337343735373637373738373937403741374237433744374537463747374837493750375137523753375437553756375737583759376037613762376337643765376637673768376937703771377237733774377537763777377837793780378137823783378437853786378737883789379037913792379337943795379637973798379938003801380238033804380538063807380838093810381138123813381438153816381738183819382038213822382338243825382638273828382938303831383238333834383538363837383838393840384138423843384438453846384738483849385038513852385338543855385638573858385938603861386238633864386538663867386838693870387138723873387438753876387738783879388038813882388338843885388638873888388938903891389238933894389538963897389838993900390139023903390439053906390739083909391039113912391339143915391639173918391939203921392239233924392539263927392839293930393139323933393439353936393739383939394039413942394339443945394639473948394939503951395239533954395539563957395839593960396139623963396439653966396739683969397039713972397339743975397639773978397939803981398239833984398539863987398839893990399139923993399439953996399739983999400040014002400340044005400640074008400940104011401240134014401540164017401840194020402140224023402440254026402740284029403040314032403340344035403640374038403940404041404240434044404540464047404840494050405140524053405440554056405740584059406040614062406340644065406640674068406940704071407240734074407540764077407840794080408140824083408440854086408740884089409040914092409340944095409640974098409941004101410241034104410541064107410841094110411141124113411441154116411741184119412041214122412341244125412641274128412941304131413241334134413541364137413841394140414141424143414441454146414741484149415041514152415341544155415641574158415941604161416241634164416541664167416841694170417141724173417441754176417741784179418041814182418341844185418641874188418941904191419241934194419541964197419841994200420142024203420442054206420742084209421042114212421342144215421642174218421942204221422242234224422542264227422842294230423142324233423442354236423742384239424042414242424342444245424642474248424942504251425242534254425542564257425842594260426142624263426442654266426742684269427042714272427342744275427642774278427942804281428242834284428542864287428842894290429142924293429442954296429742984299430043014302430343044305430643074308430943104311431243134314431543164317431843194320432143224323432443254326432743284329433043314332433343344335433643374338433943404341434243434344434543464347434843494350435143524353435443554356435743584359436043614362436343644365436643674368436943704371437243734374437543764377437843794380438143824383438443854386438743884389439043914392439343944395439643974398439944004401440244034404440544064407440844094410441144124413441444154416441744184419442044214422442344244425442644274428442944304431443244334434443544364437443844394440444144424443444444454446444744484449445044514452445344544455445644574458445944604461446244634464446544664467446844694470447144724473447444754476447744784479448044814482448344844485448644874488448944904491449244934494449544964497449844994500450145024503450445054506450745084509451045114512451345144515451645174518451945204521452245234524452545264527452845294530453145324533453445354536453745384539454045414542454345444545454645474548454945504551455245534554455545564557455845594560456145624563456445654566456745684569457045714572457345744575457645774578457945804581458245834584458545864587458845894590459145924593459445954596459745984599460046014602460346044605460646074608460946104611461246134614461546164617461846194620462146224623462446254626462746284629463046314632463346344635463646374638463946404641464246434644464546464647464846494650465146524653465446554656465746584659466046614662466346644665466646674668466946704671467246734674467546764677467846794680468146824683468446854686468746884689469046914692469346944695469646974698469947004701470247034704470547064707470847094710471147124713471447154716471747184719472047214722472347244725472647274728472947304731473247334734473547364737473847394740474147424743474447454746474747484749475047514752475347544755475647574758475947604761476247634764476547664767476847694770477147724773477447754776477747784779478047814782478347844785478647874788478947904791479247934794479547964797479847994800480148024803480448054806480748084809481048114812481348144815481648174818481948204821482248234824482548264827482848294830483148324833483448354836483748384839484048414842484348444845484648474848484948504851485248534854485548564857485848594860486148624863486448654866486748684869487048714872487348744875487648774878487948804881488248834884488548864887488848894890489148924893489448954896489748984899490049014902490349044905490649074908490949104911491249134914491549164917491849194920492149224923492449254926492749284929493049314932493349344935493649374938493949404941494249434944494549464947494849494950495149524953495449554956495749584959496049614962496349644965496649674968496949704971497249734974497549764977497849794980498149824983498449854986498749884989499049914992499349944995499649974998499950005001500250035004500550065007500850095010501150125013501450155016501750185019502050215022502350245025502650275028502950305031503250335034503550365037503850395040504150425043504450455046504750485049505050515052505350545055505650575058505950605061506250635064506550665067506850695070507150725073507450755076507750785079508050815082508350845085508650875088508950905091509250935094509550965097509850995100510151025103510451055106510751085109511051115112511351145115511651175118511951205121512251235124512551265127512851295130513151325133513451355136513751385139514051415142514351445145514651475148514951505151515251535154515551565157515851595160516151625163516451655166516751685169517051715172517351745175517651775178517951805181518251835184518551865187518851895190519151925193519451955196519751985199520052015202520352045205520652075208520952105211521252135214521552165217521852195220522152225223
  1. This document summarizes new features and bugfixes in each stable release
  2. of Tor. If you want to see more detailed descriptions of the changes in
  3. each development snapshot, see the ChangeLog file.
  4. Changes in version 0.2.1.29 - 2011-01-15
  5. Tor 0.2.1.29 continues our recent code security audit work. The main
  6. fix resolves a remote heap overflow vulnerability that can allow remote
  7. code execution. Other fixes address a variety of assert and crash bugs,
  8. most of which we think are hard to exploit remotely.
  9. o Major bugfixes (security):
  10. - Fix a heap overflow bug where an adversary could cause heap
  11. corruption. This bug probably allows remote code execution
  12. attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
  13. 0.1.2.10-rc.
  14. - Prevent a denial-of-service attack by disallowing any
  15. zlib-compressed data whose compression factor is implausibly
  16. high. Fixes part of bug 2324; reported by "doorss".
  17. - Zero out a few more keys in memory before freeing them. Fixes
  18. bug 2384 and part of bug 2385. These key instances found by
  19. "cypherpunks", based on Andrew Case's report about being able
  20. to find sensitive data in Tor's memory space if you have enough
  21. permissions. Bugfix on 0.0.2pre9.
  22. o Major bugfixes (crashes):
  23. - Prevent calls to Libevent from inside Libevent log handlers.
  24. This had potential to cause a nasty set of crashes, especially
  25. if running Libevent with debug logging enabled, and running
  26. Tor with a controller watching for low-severity log messages.
  27. Bugfix on 0.1.0.2-rc. Fixes bug 2190.
  28. - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
  29. underflow errors there too. Fixes the other part of bug 2324.
  30. - Fix a bug where we would assert if we ever had a
  31. cached-descriptors.new file (or another file read directly into
  32. memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
  33. on 0.2.1.25. Found by doorss.
  34. - Fix some potential asserts and parsing issues with grossly
  35. malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
  36. Found by doorss.
  37. o Minor bugfixes (other):
  38. - Fix a bug with handling misformed replies to reverse DNS lookup
  39. requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
  40. bug reported by doorss.
  41. - Fix compilation on mingw when a pthreads compatibility library
  42. has been installed. (We don't want to use it, so we shouldn't
  43. be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
  44. - Fix a bug where we would declare that we had run out of virtual
  45. addresses when the address space was only half-exhausted. Bugfix
  46. on 0.1.2.1-alpha.
  47. - Correctly handle the case where AutomapHostsOnResolve is set but
  48. no virtual addresses are available. Fixes bug 2328; bugfix on
  49. 0.1.2.1-alpha. Bug found by doorss.
  50. - Correctly handle wrapping around to when we run out of virtual
  51. address space. Found by cypherpunks, bugfix on 0.2.0.5-alpha.
  52. - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
  53. because we built it with a too-old version of automake. Thus that
  54. release broke ./configure --enable-openbsd-malloc, which is popular
  55. among really fast exit relays on Linux.
  56. o Minor features:
  57. - Update to the January 1 2011 Maxmind GeoLite Country database.
  58. - Introduce output size checks on all of our decryption functions.
  59. o Build changes:
  60. - Tor does not build packages correctly with Automake 1.6 and earlier;
  61. added a check to Makefile.am to make sure that we're building with
  62. Automake 1.7 or later.
  63. Changes in version 0.2.1.28 - 2010-12-17
  64. Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
  65. exploitable bugs. We also took this opportunity to change the IP address
  66. for one of our directory authorities, and to update the geoip database
  67. we ship.
  68. o Major bugfixes:
  69. - Fix a remotely exploitable bug that could be used to crash instances
  70. of Tor remotely by overflowing on the heap. Remote-code execution
  71. hasn't been confirmed, but can't be ruled out. Everyone should
  72. upgrade. Bugfix on the 0.1.1 series and later.
  73. o Directory authority changes:
  74. - Change IP address and ports for gabelmoo (v3 directory authority).
  75. o Minor features:
  76. - Update to the December 1 2010 Maxmind GeoLite Country database.
  77. Changes in version 0.2.1.27 - 2010-11-23
  78. Yet another OpenSSL security patch broke its compatibility with Tor:
  79. Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
  80. also took this opportunity to fix several crash bugs, integrate a new
  81. directory authority, and update the bundled GeoIP database.
  82. o Major bugfixes:
  83. - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
  84. No longer set the tlsext_host_name extension on server SSL objects;
  85. but continue to set it on client SSL objects. Our goal in setting
  86. it was to imitate a browser, not a vhosting server. Fixes bug 2204;
  87. bugfix on 0.2.1.1-alpha.
  88. - Do not log messages to the controller while shrinking buffer
  89. freelists. Doing so would sometimes make the controller connection
  90. try to allocate a buffer chunk, which would mess up the internals
  91. of the freelist and cause an assertion failure. Fixes bug 1125;
  92. fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
  93. - Learn our external IP address when we're a relay or bridge, even if
  94. we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
  95. where we introduced bridge relays that don't need to publish to
  96. be useful. Fixes bug 2050.
  97. - Do even more to reject (and not just ignore) annotations on
  98. router descriptors received anywhere but from the cache. Previously
  99. we would ignore such annotations at first, but cache them to disk
  100. anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
  101. - When you're using bridges and your network goes away and your
  102. bridges get marked as down, recover when you attempt a new socks
  103. connection (if the network is back), rather than waiting up to an
  104. hour to try fetching new descriptors for your bridges. Bugfix on
  105. 0.2.0.3-alpha; fixes bug 1981.
  106. o Major features:
  107. - Move to the November 2010 Maxmind GeoLite country db (rather
  108. than the June 2009 ip-to-country GeoIP db) for our statistics that
  109. count how many users relays are seeing from each country. Now we'll
  110. have more accurate data, especially for many African countries.
  111. o New directory authorities:
  112. - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
  113. authority.
  114. o Minor bugfixes:
  115. - Fix an assertion failure that could occur in directory caches or
  116. bridge users when using a very short voting interval on a testing
  117. network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
  118. 0.2.0.8-alpha.
  119. - Enforce multiplicity rules when parsing annotations. Bugfix on
  120. 0.2.0.8-alpha. Found by piebeer.
  121. - Allow handshaking OR connections to take a full KeepalivePeriod
  122. seconds to handshake. Previously, we would close them after
  123. IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
  124. were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
  125. for analysis help.
  126. - When building with --enable-gcc-warnings on OpenBSD, disable
  127. warnings in system headers. This makes --enable-gcc-warnings
  128. pass on OpenBSD 4.8.
  129. o Minor features:
  130. - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
  131. and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
  132. stream ending reason for this case: END_STREAM_REASON_NOROUTE.
  133. Servers can start sending this code when enough clients recognize
  134. it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
  135. - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
  136. Patch from mingw-san.
  137. o Removed files:
  138. - Remove the old debian/ directory from the main Tor distribution.
  139. The official Tor-for-debian git repository lives at the URL
  140. https://git.torproject.org/debian/tor.git
  141. - Stop shipping the old doc/website/ directory in the tarball. We
  142. changed the website format in late 2010, and what we shipped in
  143. 0.2.1.26 really wasn't that useful anyway.
  144. Changes in version 0.2.1.26 - 2010-05-02
  145. Tor 0.2.1.26 addresses the recent connection and memory overload
  146. problems we've been seeing on relays, especially relays with their
  147. DirPort open. If your relay has been crashing, or you turned it off
  148. because it used too many resources, give this release a try.
  149. This release also fixes yet another instance of broken OpenSSL libraries
  150. that was causing some relays to drop out of the consensus.
  151. o Major bugfixes:
  152. - Teach relays to defend themselves from connection overload. Relays
  153. now close idle circuits early if it looks like they were intended
  154. for directory fetches. Relays are also more aggressive about closing
  155. TLS connections that have no circuits on them. Such circuits are
  156. unlikely to be re-used, and tens of thousands of them were piling
  157. up at the fast relays, causing the relays to run out of sockets
  158. and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
  159. their directory fetches over TLS).
  160. - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
  161. that claim to be earlier than 0.9.8m, but which have in reality
  162. backported huge swaths of 0.9.8m or 0.9.8n renegotiation
  163. behavior. Possible fix for some cases of bug 1346.
  164. - Directory mirrors were fetching relay descriptors only from v2
  165. directory authorities, rather than v3 authorities like they should.
  166. Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
  167. to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
  168. o Minor bugfixes:
  169. - Finally get rid of the deprecated and now harmful notion of "clique
  170. mode", where directory authorities maintain TLS connections to
  171. every other relay.
  172. o Testsuite fixes:
  173. - In the util/threads test, no longer free the test_mutex before all
  174. worker threads have finished. Bugfix on 0.2.1.6-alpha.
  175. - The master thread could starve the worker threads quite badly on
  176. certain systems, causing them to run only partially in the allowed
  177. window. This resulted in test failures. Now the master thread sleeps
  178. occasionally for a few microseconds while the two worker-threads
  179. compete for the mutex. Bugfix on 0.2.0.1-alpha.
  180. Changes in version 0.2.1.25 - 2010-03-16
  181. Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
  182. prevent relays from guessing their IP address correctly. It also fixes
  183. several minor potential security bugs.
  184. o Major bugfixes:
  185. - Fix a regression from our patch for bug 1244 that caused relays
  186. to guess their IP address incorrectly if they didn't set Address
  187. in their torrc and/or their address fails to resolve. Bugfix on
  188. 0.2.1.23; fixes bug 1269.
  189. - When freeing a session key, zero it out completely. We only zeroed
  190. the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
  191. patched by ekir. Fixes bug 1254.
  192. o Minor bugfixes:
  193. - Fix a dereference-then-NULL-check sequence when publishing
  194. descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
  195. bug 1255.
  196. - Fix another dereference-then-NULL-check sequence. Bugfix on
  197. 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
  198. - Make sure we treat potentially not NUL-terminated strings correctly.
  199. Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
  200. Changes in version 0.2.1.24 - 2010-02-21
  201. Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
  202. for sure!
  203. o Minor bugfixes:
  204. - Work correctly out-of-the-box with even more vendor-patched versions
  205. of OpenSSL. In particular, make it so Debian and OS X don't need
  206. customized patches to run/build.
  207. Changes in version 0.2.1.23 - 2010-02-13
  208. Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
  209. again on the latest OS X, and updates the location of a directory
  210. authority.
  211. o Major bugfixes (performance):
  212. - We were selecting our guards uniformly at random, and then weighting
  213. which of our guards we'd use uniformly at random. This imbalance
  214. meant that Tor clients were severely limited on throughput (and
  215. probably latency too) by the first hop in their circuit. Now we
  216. select guards weighted by currently advertised bandwidth. We also
  217. automatically discard guards picked using the old algorithm. Fixes
  218. bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
  219. o Major bugfixes:
  220. - Make Tor work again on the latest OS X: when deciding whether to
  221. use strange flags to turn TLS renegotiation on, detect the OpenSSL
  222. version at run-time, not compile time. We need to do this because
  223. Apple doesn't update its dev-tools headers when it updates its
  224. libraries in a security patch.
  225. - Fix a potential buffer overflow in lookup_last_hid_serv_request()
  226. that could happen on 32-bit platforms with 64-bit time_t. Also fix
  227. a memory leak when requesting a hidden service descriptor we've
  228. requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
  229. by aakova.
  230. o Minor bugfixes:
  231. - Refactor resolve_my_address() to not use gethostbyname() anymore.
  232. Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
  233. o Minor features:
  234. - Avoid a mad rush at the beginning of each month when each client
  235. rotates half of its guards. Instead we spread the rotation out
  236. throughout the month, but we still avoid leaving a precise timestamp
  237. in the state file about when we first picked the guard. Improves
  238. over the behavior introduced in 0.1.2.17.
  239. Changes in version 0.2.1.22 - 2010-01-19
  240. Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
  241. authorities -- it would tell you its whole history of bridge descriptors
  242. if you make the right directory request. This stable update also
  243. rotates two of the seven v3 directory authority keys and locations.
  244. o Directory authority changes:
  245. - Rotate keys (both v3 identity and relay identity) for moria1
  246. and gabelmoo.
  247. o Major bugfixes:
  248. - Stop bridge directory authorities from answering dbg-stability.txt
  249. directory queries, which would let people fetch a list of all
  250. bridge identities they track. Bugfix on 0.2.1.6-alpha.
  251. Changes in version 0.2.1.21 - 2009-12-21
  252. Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
  253. library. If you use Tor on Linux / Unix and you're getting SSL
  254. renegotiation errors, upgrading should help. We also recommend an
  255. upgrade if you're an exit relay.
  256. o Major bugfixes:
  257. - Work around a security feature in OpenSSL 0.9.8l that prevents our
  258. handshake from working unless we explicitly tell OpenSSL that we
  259. are using SSL renegotiation safely. We are, of course, but OpenSSL
  260. 0.9.8l won't work unless we say we are.
  261. - Avoid crashing if the client is trying to upload many bytes and the
  262. circuit gets torn down at the same time, or if the flip side
  263. happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
  264. o Minor bugfixes:
  265. - Do not refuse to learn about authority certs and v2 networkstatus
  266. documents that are older than the latest consensus. This bug might
  267. have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
  268. Spotted and fixed by xmux.
  269. - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
  270. trigger platform-specific option misparsing case found by Coverity
  271. Scan.
  272. - Fix a compilation warning on Fedora 12 by removing an impossible-to-
  273. trigger assert. Fixes bug 1173.
  274. Changes in version 0.2.1.20 - 2009-10-15
  275. Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
  276. services at once, prepares for more performance improvements, and
  277. fixes a bunch of smaller bugs.
  278. The Windows and OS X bundles also include a more recent Vidalia,
  279. and switch from Privoxy to Polipo.
  280. The OS X installers are now drag and drop. It's best to un-install
  281. Tor/Vidalia and then install this new bundle, rather than upgrade. If
  282. you want to upgrade, you'll need to update the paths for Tor and Polipo
  283. in the Vidalia Settings window.
  284. o Major bugfixes:
  285. - Send circuit or stream sendme cells when our window has decreased
  286. by 100 cells, not when it has decreased by 101 cells. Bug uncovered
  287. by Karsten when testing the "reduce circuit window" performance
  288. patch. Bugfix on the 54th commit on Tor -- from July 2002,
  289. before the release of Tor 0.0.0. This is the new winner of the
  290. oldest-bug prize.
  291. - Fix a remotely triggerable memory leak when a consensus document
  292. contains more than one signature from the same voter. Bugfix on
  293. 0.2.0.3-alpha.
  294. - Avoid segfault in rare cases when finishing an introduction circuit
  295. as a client and finding out that we don't have an introduction key
  296. for it. Fixes bug 1073. Reported by Aaron Swartz.
  297. o Major features:
  298. - Tor now reads the "circwindow" parameter out of the consensus,
  299. and uses that value for its circuit package window rather than the
  300. default of 1000 cells. Begins the implementation of proposal 168.
  301. o New directory authorities:
  302. - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
  303. authority.
  304. - Move moria1 and tonga to alternate IP addresses.
  305. o Minor bugfixes:
  306. - Fix a signed/unsigned compile warning in 0.2.1.19.
  307. - Fix possible segmentation fault on directory authorities. Bugfix on
  308. 0.2.1.14-rc.
  309. - Fix an extremely rare infinite recursion bug that could occur if
  310. we tried to log a message after shutting down the log subsystem.
  311. Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
  312. - Fix an obscure bug where hidden services on 64-bit big-endian
  313. systems might mis-read the timestamp in v3 introduce cells, and
  314. refuse to connect back to the client. Discovered by "rotor".
  315. Bugfix on 0.2.1.6-alpha.
  316. - We were triggering a CLOCK_SKEW controller status event whenever
  317. we connect via the v2 connection protocol to any relay that has
  318. a wrong clock. Instead, we should only inform the controller when
  319. it's a trusted authority that claims our clock is wrong. Bugfix
  320. on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
  321. - We were telling the controller about CHECKING_REACHABILITY and
  322. REACHABILITY_FAILED status events whenever we launch a testing
  323. circuit or notice that one has failed. Instead, only tell the
  324. controller when we want to inform the user of overall success or
  325. overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
  326. by SwissTorExit.
  327. - Don't warn when we're using a circuit that ends with a node
  328. excluded in ExcludeExitNodes, but the circuit is not used to access
  329. the outside world. This should help fix bug 1090. Bugfix on
  330. 0.2.1.6-alpha.
  331. - Work around a small memory leak in some versions of OpenSSL that
  332. stopped the memory used by the hostname TLS extension from being
  333. freed.
  334. o Minor features:
  335. - Add a "getinfo status/accepted-server-descriptor" controller
  336. command, which is the recommended way for controllers to learn
  337. whether our server descriptor has been successfully received by at
  338. least on directory authority. Un-recommend good-server-descriptor
  339. getinfo and status events until we have a better design for them.
  340. Changes in version 0.2.1.19 - 2009-07-28
  341. Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
  342. services.
  343. o Major bugfixes:
  344. - Make accessing hidden services on 0.2.1.x work right again.
  345. Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
  346. part of patch provided by "optimist".
  347. o Minor features:
  348. - When a relay/bridge is writing out its identity key fingerprint to
  349. the "fingerprint" file and to its logs, write it without spaces. Now
  350. it will look like the fingerprints in our bridges documentation,
  351. and confuse fewer users.
  352. o Minor bugfixes:
  353. - Relays no longer publish a new server descriptor if they change
  354. their MaxAdvertisedBandwidth config option but it doesn't end up
  355. changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
  356. fixes bug 1026. Patch from Sebastian.
  357. - Avoid leaking memory every time we get a create cell but we have
  358. so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
  359. fixes bug 1034. Reported by BarkerJr.
  360. Changes in version 0.2.1.18 - 2009-07-24
  361. Tor 0.2.1.18 lays the foundations for performance improvements,
  362. adds status events to help users diagnose bootstrap problems, adds
  363. optional authentication/authorization for hidden services, fixes a
  364. variety of potential anonymity problems, and includes a huge pile of
  365. other features and bug fixes.
  366. o Major features (clients):
  367. - Start sending "bootstrap phase" status events to the controller,
  368. so it can keep the user informed of progress fetching directory
  369. information and establishing circuits. Also inform the controller
  370. if we think we're stuck at a particular bootstrap phase. Implements
  371. proposal 137.
  372. - Clients replace entry guards that were chosen more than a few months
  373. ago. This change should significantly improve client performance,
  374. especially once more people upgrade, since relays that have been
  375. a guard for a long time are currently overloaded.
  376. - Network status consensus documents and votes now contain bandwidth
  377. information for each relay. Clients use the bandwidth values
  378. in the consensus, rather than the bandwidth values in each
  379. relay descriptor. This approach opens the door to more accurate
  380. bandwidth estimates once the directory authorities start doing
  381. active measurements. Implements part of proposal 141.
  382. o Major features (relays):
  383. - Disable and refactor some debugging checks that forced a linear scan
  384. over the whole server-side DNS cache. These accounted for over 50%
  385. of CPU time on a relatively busy exit node's gprof profile. Also,
  386. disable some debugging checks that appeared in exit node profile
  387. data. Found by Jacob.
  388. - New DirPortFrontPage option that takes an html file and publishes
  389. it as "/" on the DirPort. Now relay operators can provide a
  390. disclaimer without needing to set up a separate webserver. There's
  391. a sample disclaimer in contrib/tor-exit-notice.html.
  392. o Major features (hidden services):
  393. - Make it possible to build hidden services that only certain clients
  394. are allowed to connect to. This is enforced at several points,
  395. so that unauthorized clients are unable to send INTRODUCE cells
  396. to the service, or even (depending on the type of authentication)
  397. to learn introduction points. This feature raises the bar for
  398. certain kinds of active attacks against hidden services. Design
  399. and code by Karsten Loesing. Implements proposal 121.
  400. - Relays now store and serve v2 hidden service descriptors by default,
  401. i.e., the new default value for HidServDirectoryV2 is 1. This is
  402. the last step in proposal 114, which aims to make hidden service
  403. lookups more reliable.
  404. o Major features (path selection):
  405. - ExitNodes and Exclude*Nodes config options now allow you to restrict
  406. by country code ("{US}") or IP address or address pattern
  407. ("255.128.0.0/16"). Patch from Robert Hogan. It still needs some
  408. refinement to decide what config options should take priority if
  409. you ask to both use a particular node and exclude it.
  410. o Major features (misc):
  411. - When building a consensus, do not include routers that are down.
  412. This cuts down 30% to 40% on consensus size. Implements proposal
  413. 138.
  414. - New TestingTorNetwork config option to allow adjustment of
  415. previously constant values that could slow bootstrapping. Implements
  416. proposal 135. Patch from Karsten.
  417. - Convert many internal address representations to optionally hold
  418. IPv6 addresses. Generate and accept IPv6 addresses in many protocol
  419. elements. Make resolver code handle nameservers located at IPv6
  420. addresses.
  421. - More work on making our TLS handshake blend in: modify the list
  422. of ciphers advertised by OpenSSL in client mode to even more
  423. closely resemble a common web browser. We cheat a little so that
  424. we can advertise ciphers that the locally installed OpenSSL doesn't
  425. know about.
  426. - Use the TLS1 hostname extension to more closely resemble browser
  427. behavior.
  428. o Security fixes (anonymity/entropy):
  429. - Never use a connection with a mismatched address to extend a
  430. circuit, unless that connection is canonical. A canonical
  431. connection is one whose address is authenticated by the router's
  432. identity key, either in a NETINFO cell or in a router descriptor.
  433. - Implement most of proposal 110: The first K cells to be sent
  434. along a circuit are marked as special "early" cells; only K "early"
  435. cells will be allowed. Once this code is universal, we can block
  436. certain kinds of denial-of-service attack by requiring that EXTEND
  437. commands must be sent using an "early" cell.
  438. - Resume using OpenSSL's RAND_poll() for better (and more portable)
  439. cross-platform entropy collection again. We used to use it, then
  440. stopped using it because of a bug that could crash systems that
  441. called RAND_poll when they had a lot of fds open. It looks like the
  442. bug got fixed in late 2006. Our new behavior is to call RAND_poll()
  443. at startup, and to call RAND_poll() when we reseed later only if
  444. we have a non-buggy OpenSSL version.
  445. - When the client is choosing entry guards, now it selects at most
  446. one guard from a given relay family. Otherwise we could end up with
  447. all of our entry points into the network run by the same operator.
  448. Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
  449. - Do not use or believe expired v3 authority certificates. Patch
  450. from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
  451. - Drop begin cells to a hidden service if they come from the middle
  452. of a circuit. Patch from lark.
  453. - When we erroneously receive two EXTEND cells for the same circuit
  454. ID on the same connection, drop the second. Patch from lark.
  455. - Authorities now vote for the Stable flag for any router whose
  456. weighted MTBF is at least 5 days, regardless of the mean MTBF.
  457. - Clients now never report any stream end reason except 'MISC'.
  458. Implements proposal 148.
  459. o Major bugfixes (crashes):
  460. - Parse dates and IPv4 addresses in a locale- and libc-independent
  461. manner, to avoid platform-dependent behavior on malformed input.
  462. - Fix a crash that occurs on exit nodes when a nameserver request
  463. timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
  464. been suppressing the bug since 0.1.2.10-alpha. Partial fix for
  465. bug 929.
  466. - Do not assume that a stack-allocated character array will be
  467. 64-bit aligned on platforms that demand that uint64_t access is
  468. aligned. Possible fix for bug 604.
  469. - Resolve a very rare crash bug that could occur when the user forced
  470. a nameserver reconfiguration during the middle of a nameserver
  471. probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
  472. - Avoid a "0 divided by 0" calculation when calculating router uptime
  473. at directory authorities. Bugfix on 0.2.0.8-alpha.
  474. - Fix an assertion bug in parsing policy-related options; possible fix
  475. for bug 811.
  476. - Rate-limit too-many-sockets messages: when they happen, they happen
  477. a lot and end up filling up the disk. Resolves bug 748.
  478. - Fix a race condition that could cause crashes or memory corruption
  479. when running as a server with a controller listening for log
  480. messages.
  481. - Avoid crashing when we have a policy specified in a DirPolicy or
  482. SocksPolicy or ReachableAddresses option with ports set on it,
  483. and we re-load the policy. May fix bug 996.
  484. - Fix an assertion failure on 64-bit platforms when we allocated
  485. memory right up to the end of a memarea, then realigned the memory
  486. one step beyond the end. Fixes a possible cause of bug 930.
  487. - Protect the count of open sockets with a mutex, so we can't
  488. corrupt it when two threads are closing or opening sockets at once.
  489. Fix for bug 939. Bugfix on 0.2.0.1-alpha.
  490. o Major bugfixes (clients):
  491. - Discard router descriptors as we load them if they are more than
  492. five days old. Otherwise if Tor is off for a long time and then
  493. starts with cached descriptors, it will try to use the onion keys
  494. in those obsolete descriptors when building circuits. Fixes bug 887.
  495. - When we choose to abandon a new entry guard because we think our
  496. older ones might be better, close any circuits pending on that
  497. new entry guard connection. This fix should make us recover much
  498. faster when our network is down and then comes back. Bugfix on
  499. 0.1.2.8-beta; found by lodger.
  500. - When Tor clients restart after 1-5 days, they discard all their
  501. cached descriptors as too old, but they still use the cached
  502. consensus document. This approach is good for robustness, but
  503. bad for performance: since they don't know any bandwidths, they
  504. end up choosing at random rather than weighting their choice by
  505. speed. Fixed by the above feature of putting bandwidths in the
  506. consensus.
  507. o Major bugfixes (relays):
  508. - Relays were falling out of the networkstatus consensus for
  509. part of a day if they changed their local config but the
  510. authorities discarded their new descriptor as "not sufficiently
  511. different". Now directory authorities accept a descriptor as changed
  512. if BandwidthRate or BandwidthBurst changed. Partial fix for bug 962;
  513. patch by Sebastian.
  514. - Ensure that two circuits can never exist on the same connection
  515. with the same circuit ID, even if one is marked for close. This
  516. is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
  517. - Directory authorities were neglecting to mark relays down in their
  518. internal histories if the relays fall off the routerlist without
  519. ever being found unreachable. So there were relays in the histories
  520. that haven't been seen for eight months, and are listed as being
  521. up for eight months. This wreaked havoc on the "median wfu" and
  522. "median mtbf" calculations, in turn making Guard and Stable flags
  523. wrong, hurting network performance. Fixes bugs 696 and 969. Bugfix
  524. on 0.2.0.6-alpha.
  525. o Major bugfixes (hidden services):
  526. - When establishing a hidden service, introduction points that
  527. originate from cannibalized circuits were completely ignored
  528. and not included in rendezvous service descriptors. This might
  529. have been another reason for delay in making a hidden service
  530. available. Bugfix from long ago (0.0.9.x?)
  531. o Major bugfixes (memory and resource management):
  532. - Fixed some memory leaks -- some quite frequent, some almost
  533. impossible to trigger -- based on results from Coverity.
  534. - Speed up parsing and cut down on memory fragmentation by using
  535. stack-style allocations for parsing directory objects. Previously,
  536. this accounted for over 40% of allocations from within Tor's code
  537. on a typical directory cache.
  538. - Use a Bloom filter rather than a digest-based set to track which
  539. descriptors we need to keep around when we're cleaning out old
  540. router descriptors. This speeds up the computation significantly,
  541. and may reduce fragmentation.
  542. o New/changed config options:
  543. - Now NodeFamily and MyFamily config options allow spaces in
  544. identity fingerprints, so it's easier to paste them in.
  545. Suggested by Lucky Green.
  546. - Allow ports 465 and 587 in the default exit policy again. We had
  547. rejected them in 0.1.0.15, because back in 2005 they were commonly
  548. misconfigured and ended up as spam targets. We hear they are better
  549. locked down these days.
  550. - Make TrackHostExit mappings expire a while after their last use, not
  551. after their creation. Patch from Robert Hogan.
  552. - Add an ExcludeExitNodes option so users can list a set of nodes
  553. that should be be excluded from the exit node position, but
  554. allowed elsewhere. Implements proposal 151.
  555. - New --hush command-line option similar to --quiet. While --quiet
  556. disables all logging to the console on startup, --hush limits the
  557. output to messages of warning and error severity.
  558. - New configure/torrc options (--enable-geoip-stats,
  559. DirRecordUsageByCountry) to record how many IPs we've served
  560. directory info to in each country code, how many status documents
  561. total we've sent to each country code, and what share of the total
  562. directory requests we should expect to see.
  563. - Make outbound DNS packets respect the OutboundBindAddress setting.
  564. Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
  565. - Allow separate log levels to be configured for different logging
  566. domains. For example, this allows one to log all notices, warnings,
  567. or errors, plus all memory management messages of level debug or
  568. higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
  569. - Update to the "June 3 2009" ip-to-country file.
  570. o Minor features (relays):
  571. - Raise the minimum rate limiting to be a relay from 20000 bytes
  572. to 20480 bytes (aka 20KB/s), to match our documentation. Also
  573. update directory authorities so they always assign the Fast flag
  574. to relays with 20KB/s of capacity. Now people running relays won't
  575. suddenly find themselves not seeing any use, if the network gets
  576. faster on average.
  577. - If we're a relay and we change our IP address, be more verbose
  578. about the reason that made us change. Should help track down
  579. further bugs for relays on dynamic IP addresses.
  580. - Exit servers can now answer resolve requests for ip6.arpa addresses.
  581. - Implement most of Proposal 152: allow specialized servers to permit
  582. single-hop circuits, and clients to use those servers to build
  583. single-hop circuits when using a specialized controller. Patch
  584. from Josh Albrecht. Resolves feature request 768.
  585. - When relays do their initial bandwidth measurement, don't limit
  586. to just our entry guards for the test circuits. Otherwise we tend
  587. to have multiple test circuits going through a single entry guard,
  588. which makes our bandwidth test less accurate. Fixes part of bug 654;
  589. patch contributed by Josh Albrecht.
  590. o Minor features (directory authorities):
  591. - Try not to open more than one descriptor-downloading connection
  592. to an authority at once. This should reduce load on directory
  593. authorities. Fixes bug 366.
  594. - Add cross-certification to newly generated certificates, so that
  595. a signing key is enough information to look up a certificate. Start
  596. serving certificates by <identity digest, signing key digest>
  597. pairs. Implements proposal 157.
  598. - When a directory authority downloads a descriptor that it then
  599. immediately rejects, do not retry downloading it right away. Should
  600. save some bandwidth on authorities. Fix for bug 888. Patch by
  601. Sebastian Hahn.
  602. - Directory authorities now serve a /tor/dbg-stability.txt URL to
  603. help debug WFU and MTBF calculations.
  604. - In directory authorities' approved-routers files, allow
  605. fingerprints with or without space.
  606. o Minor features (directory mirrors):
  607. - When a download gets us zero good descriptors, do not notify
  608. Tor that new directory information has arrived.
  609. - Servers support a new URL scheme for consensus downloads that
  610. allows the client to specify which authorities are trusted.
  611. The server then only sends the consensus if the client will trust
  612. it. Otherwise a 404 error is sent back. Clients use this
  613. new scheme when the server supports it (meaning it's running
  614. 0.2.1.1-alpha or later). Implements proposal 134.
  615. o Minor features (bridges):
  616. - If the bridge config line doesn't specify a port, assume 443.
  617. This makes bridge lines a bit smaller and easier for users to
  618. understand.
  619. - If we're using bridges and our network goes away, be more willing
  620. to forgive our bridges and try again when we get an application
  621. request.
  622. o Minor features (hidden services):
  623. - When the client launches an introduction circuit, retry with a
  624. new circuit after 30 seconds rather than 60 seconds.
  625. - Launch a second client-side introduction circuit in parallel
  626. after a delay of 15 seconds (based on work by Christian Wilms).
  627. - Hidden services start out building five intro circuits rather
  628. than three, and when the first three finish they publish a service
  629. descriptor using those. Now we publish our service descriptor much
  630. faster after restart.
  631. - Drop the requirement to have an open dir port for storing and
  632. serving v2 hidden service descriptors.
  633. o Minor features (build and packaging):
  634. - On Linux, use the prctl call to re-enable core dumps when the User
  635. option is set.
  636. - Try to make sure that the version of Libevent we're running with
  637. is binary-compatible with the one we built with. May address bug
  638. 897 and others.
  639. - Add a new --enable-local-appdata configuration switch to change
  640. the default location of the datadir on win32 from APPDATA to
  641. LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
  642. entirely. Patch from coderman.
  643. - Build correctly against versions of OpenSSL 0.9.8 or later that
  644. are built without support for deprecated functions.
  645. - On platforms with a maximum syslog string length, truncate syslog
  646. messages to that length ourselves, rather than relying on the
  647. system to do it for us.
  648. - Automatically detect MacOSX versions earlier than 10.4.0, and
  649. disable kqueue from inside Tor when running with these versions.
  650. We previously did this from the startup script, but that was no
  651. help to people who didn't use the startup script. Resolves bug 863.
  652. - Build correctly when configured to build outside the main source
  653. path. Patch from Michael Gold.
  654. - Disable GCC's strict alias optimization by default, to avoid the
  655. likelihood of its introducing subtle bugs whenever our code violates
  656. the letter of C99's alias rules.
  657. - Change the contrib/tor.logrotate script so it makes the new
  658. logs as "_tor:_tor" rather than the default, which is generally
  659. "root:wheel". Fixes bug 676, reported by Serge Koksharov.
  660. - Change our header file guard macros to be less likely to conflict
  661. with system headers. Adam Langley noticed that we were conflicting
  662. with log.h on Android.
  663. - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
  664. and stop using a warning that had become unfixably verbose under
  665. GCC 4.3.
  666. - Use a lockfile to make sure that two Tor processes are not
  667. simultaneously running with the same datadir.
  668. - Allow OpenSSL to use dynamic locks if it wants.
  669. - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
  670. o Minor features (controllers):
  671. - When generating circuit events with verbose nicknames for
  672. controllers, try harder to look up nicknames for routers on a
  673. circuit. (Previously, we would look in the router descriptors we had
  674. for nicknames, but not in the consensus.) Partial fix for bug 941.
  675. - New controller event NEWCONSENSUS that lists the networkstatus
  676. lines for every recommended relay. Now controllers like Torflow
  677. can keep up-to-date on which relays they should be using.
  678. - New controller event "clients_seen" to report a geoip-based summary
  679. of which countries we've seen clients from recently. Now controllers
  680. like Vidalia can show bridge operators that they're actually making
  681. a difference.
  682. - Add a 'getinfo status/clients-seen' controller command, in case
  683. controllers want to hear clients_seen events but connect late.
  684. - New CONSENSUS_ARRIVED event to note when a new consensus has
  685. been fetched and validated.
  686. - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
  687. controllers to prevent SIGHUP from reloading the configuration.
  688. Fixes bug 856.
  689. - Return circuit purposes in response to GETINFO circuit-status.
  690. Fixes bug 858.
  691. - Serve the latest v3 networkstatus consensus via the control
  692. port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
  693. - Add a "GETINFO /status/bootstrap-phase" controller option, so the
  694. controller can query our current bootstrap state in case it attaches
  695. partway through and wants to catch up.
  696. - Provide circuit purposes along with circuit events to the controller.
  697. o Minor features (tools):
  698. - Do not have tor-resolve automatically refuse all .onion addresses;
  699. if AutomapHostsOnResolve is set in your torrc, this will work fine.
  700. - Add a -p option to tor-resolve for specifying the SOCKS port: some
  701. people find host:port too confusing.
  702. - Print the SOCKS5 error message string as well as the error code
  703. when a tor-resolve request fails. Patch from Jacob.
  704. o Minor bugfixes (memory and resource management):
  705. - Clients no longer cache certificates for authorities they do not
  706. recognize. Bugfix on 0.2.0.9-alpha.
  707. - Do not use C's stdio library for writing to log files. This will
  708. improve logging performance by a minute amount, and will stop
  709. leaking fds when our disk is full. Fixes bug 861.
  710. - Stop erroneous use of O_APPEND in cases where we did not in fact
  711. want to re-seek to the end of a file before every last write().
  712. - Fix a small alignment and memory-wasting bug on buffer chunks.
  713. Spotted by rovv.
  714. - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
  715. to avoid unused RAM in buffer chunks and memory pools.
  716. - Reduce the default smartlist size from 32 to 16; it turns out that
  717. most smartlists hold around 8-12 elements tops.
  718. - Make dumpstats() log the fullness and size of openssl-internal
  719. buffers.
  720. - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
  721. patch to their OpenSSL, turn it on to save memory on servers. This
  722. patch will (with any luck) get included in a mainline distribution
  723. before too long.
  724. - Fix a memory leak when v3 directory authorities load their keys
  725. and cert from disk. Bugfix on 0.2.0.1-alpha.
  726. - Stop using malloc_usable_size() to use more area than we had
  727. actually allocated: it was safe, but made valgrind really unhappy.
  728. - Make the assert_circuit_ok() function work correctly on circuits that
  729. have already been marked for close.
  730. - Fix uninitialized size field for memory area allocation: may improve
  731. memory performance during directory parsing.
  732. o Minor bugfixes (clients):
  733. - Stop reloading the router list from disk for no reason when we
  734. run out of reachable directory mirrors. Once upon a time reloading
  735. it would set the 'is_running' flag back to 1 for them. It hasn't
  736. done that for a long time.
  737. - When we had picked an exit node for a connection, but marked it as
  738. "optional", and it turned out we had no onion key for the exit,
  739. stop wanting that exit and try again. This situation may not
  740. be possible now, but will probably become feasible with proposal
  741. 158. Spotted by rovv. Fixes another case of bug 752.
  742. - Fix a bug in address parsing that was preventing bridges or hidden
  743. service targets from being at IPv6 addresses.
  744. - Do not remove routers as too old if we do not have any consensus
  745. document. Bugfix on 0.2.0.7-alpha.
  746. - When an exit relay resolves a stream address to a local IP address,
  747. do not just keep retrying that same exit relay over and
  748. over. Instead, just close the stream. Addresses bug 872. Bugfix
  749. on 0.2.0.32. Patch from rovv.
  750. - Made Tor a little less aggressive about deleting expired
  751. certificates. Partial fix for bug 854.
  752. - Treat duplicate certificate fetches as failures, so that we do
  753. not try to re-fetch an expired certificate over and over and over.
  754. - Do not say we're fetching a certificate when we'll in fact skip it
  755. because of a pending download.
  756. - If we have correct permissions on $datadir, we complain to stdout
  757. and fail to start. But dangerous permissions on
  758. $datadir/cached-status/ would cause us to open a log and complain
  759. there. Now complain to stdout and fail to start in both cases. Fixes
  760. bug 820, reported by seeess.
  761. o Minor bugfixes (bridges):
  762. - When we made bridge authorities stop serving bridge descriptors over
  763. unencrypted links, we also broke DirPort reachability testing for
  764. bridges. So bridges with a non-zero DirPort were printing spurious
  765. warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
  766. - Don't allow a bridge to publish its router descriptor to a
  767. non-bridge directory authority. Fixes part of bug 932.
  768. - When we change to or from being a bridge, reset our counts of
  769. client usage by country. Fixes bug 932.
  770. o Minor bugfixes (relays):
  771. - Log correct error messages for DNS-related network errors on
  772. Windows.
  773. - Actually return -1 in the error case for read_bandwidth_usage().
  774. Harmless bug, since we currently don't care about the return value
  775. anywhere. Bugfix on 0.2.0.9-alpha.
  776. - Provide a more useful log message if bug 977 (related to buffer
  777. freelists) ever reappears, and do not crash right away.
  778. - We were already rejecting relay begin cells with destination port
  779. of 0. Now also reject extend cells with destination port or address
  780. of 0. Suggested by lark.
  781. - When we can't transmit a DNS request due to a network error, retry
  782. it after a while, and eventually transmit a failing response to
  783. the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
  784. - Solve a bug that kept hardware crypto acceleration from getting
  785. enabled when accounting was turned on. Fixes bug 907. Bugfix on
  786. 0.0.9pre6.
  787. - When a canonical connection appears later in our internal list
  788. than a noncanonical one for a given OR ID, always use the
  789. canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
  790. Spotted by rovv.
  791. - Avoid some nasty corner cases in the logic for marking connections
  792. as too old or obsolete or noncanonical for circuits. Partial
  793. bugfix on bug 891.
  794. - Fix another interesting corner-case of bug 891 spotted by rovv:
  795. Previously, if two hosts had different amounts of clock drift, and
  796. one of them created a new connection with just the wrong timing,
  797. the other might decide to deprecate the new connection erroneously.
  798. Bugfix on 0.1.1.13-alpha.
  799. - If one win32 nameserver fails to get added, continue adding the
  800. rest, and don't automatically fail.
  801. - Fix a bug where an unreachable relay would establish enough
  802. reachability testing circuits to do a bandwidth test -- if
  803. we already have a connection to the middle hop of the testing
  804. circuit, then it could establish the last hop by using the existing
  805. connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
  806. circuits no longer use entry guards in 0.2.1.3-alpha.
  807. o Minor bugfixes (directory authorities):
  808. - Limit uploaded directory documents to be 16M rather than 500K.
  809. The directory authorities were refusing v3 consensus votes from
  810. other authorities, since the votes are now 504K. Fixes bug 959;
  811. bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
  812. - Directory authorities should never send a 503 "busy" response to
  813. requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
  814. bug 959.
  815. - Fix code so authorities _actually_ send back X-Descriptor-Not-New
  816. headers. Bugfix on 0.2.0.10-alpha.
  817. o Minor bugfixes (hidden services):
  818. - When we can't find an intro key for a v2 hidden service descriptor,
  819. fall back to the v0 hidden service descriptor and log a bug message.
  820. Workaround for bug 1024.
  821. - In very rare situations new hidden service descriptors were
  822. published earlier than 30 seconds after the last change to the
  823. service. (We currently think that a hidden service descriptor
  824. that's been stable for 30 seconds is worth publishing.)
  825. - If a hidden service sends us an END cell, do not consider
  826. retrying the connection; just close it. Patch from rovv.
  827. - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
  828. service directories if they have no advertised dir port. Bugfix
  829. on 0.2.0.10-alpha.
  830. o Minor bugfixes (tools):
  831. - In the torify(1) manpage, mention that tsocks will leak your
  832. DNS requests.
  833. o Minor bugfixes (controllers):
  834. - If the controller claimed responsibility for a stream, but that
  835. stream never finished making its connection, it would live
  836. forever in circuit_wait state. Now we close it after SocksTimeout
  837. seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
  838. - Make DNS resolved controller events into "CLOSED", not
  839. "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
  840. bug 807.
  841. - The control port would close the connection before flushing long
  842. replies, such as the network consensus, if a QUIT command was issued
  843. before the reply had completed. Now, the control port flushes all
  844. pending replies before closing the connection. Also fix a spurious
  845. warning when a QUIT command is issued after a malformed or rejected
  846. AUTHENTICATE command, but before the connection was closed. Patch
  847. by Marcus Griep. Fixes bugs 1015 and 1016.
  848. - Fix a bug that made stream bandwidth get misreported to the
  849. controller.
  850. o Deprecated and removed features:
  851. - The old "tor --version --version" command, which would print out
  852. the subversion "Id" of most of the source files, is now removed. It
  853. turned out to be less useful than we'd expected, and harder to
  854. maintain.
  855. - RedirectExits has been removed. It was deprecated since
  856. 0.2.0.3-alpha.
  857. - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
  858. has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
  859. - Cell pools are now always enabled; --disable-cell-pools is ignored.
  860. - Directory mirrors no longer fetch the v1 directory or
  861. running-routers files. They are obsolete, and nobody asks for them
  862. anymore. This is the first step to making v1 authorities obsolete.
  863. - Take out the TestVia config option, since it was a workaround for
  864. a bug that was fixed in Tor 0.1.1.21.
  865. - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
  866. HiddenServiceExcludeNodes as obsolete: they never worked properly,
  867. and nobody seems to be using them. Fixes bug 754. Bugfix on
  868. 0.1.0.1-rc. Patch from Christian Wilms.
  869. - Remove all backward-compatibility code for relays running
  870. versions of Tor so old that they no longer work at all on the
  871. Tor network.
  872. o Code simplifications and refactoring:
  873. - Tool-assisted documentation cleanup. Nearly every function or
  874. static variable in Tor should have its own documentation now.
  875. - Rename the confusing or_is_obsolete field to the more appropriate
  876. is_bad_for_new_circs, and move it to or_connection_t where it
  877. belongs.
  878. - Move edge-only flags from connection_t to edge_connection_t: not
  879. only is this better coding, but on machines of plausible alignment,
  880. it should save 4-8 bytes per connection_t. "Every little bit helps."
  881. - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
  882. for consistency; keep old option working for backward compatibility.
  883. - Simplify the code for finding connections to use for a circuit.
  884. - Revise the connection_new functions so that a more typesafe variant
  885. exists. This will work better with Coverity, and let us find any
  886. actual mistakes we're making here.
  887. - Refactor unit testing logic so that dmalloc can be used sensibly
  888. with unit tests to check for memory leaks.
  889. - Move all hidden-service related fields from connection and circuit
  890. structure to substructures: this way they won't eat so much memory.
  891. - Squeeze 2-5% out of client performance (according to oprofile) by
  892. improving the implementation of some policy-manipulation functions.
  893. - Change the implementation of ExcludeNodes and ExcludeExitNodes to
  894. be more efficient. Formerly it was quadratic in the number of
  895. servers; now it should be linear. Fixes bug 509.
  896. - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
  897. and n_conn_id_digest fields into a separate structure that's
  898. only needed when the circuit has not yet attached to an n_conn.
  899. - Optimize out calls to time(NULL) that occur for every IO operation,
  900. or for every cell. On systems like Windows where time() is a
  901. slow syscall, this fix will be slightly helpful.
  902. Changes in version 0.2.0.35 - 2009-06-24
  903. o Security fix:
  904. - Avoid crashing in the presence of certain malformed descriptors.
  905. Found by lark, and by automated fuzzing.
  906. - Fix an edge case where a malicious exit relay could convince a
  907. controller that the client's DNS question resolves to an internal IP
  908. address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
  909. o Major bugfixes:
  910. - Finally fix the bug where dynamic-IP relays disappear when their
  911. IP address changes: directory mirrors were mistakenly telling
  912. them their old address if they asked via begin_dir, so they
  913. never got an accurate answer about their new address, so they
  914. just vanished after a day. For belt-and-suspenders, relays that
  915. don't set Address in their config now avoid using begin_dir for
  916. all direct connections. Should fix bugs 827, 883, and 900.
  917. - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
  918. that would occur on some exit nodes when DNS failures and timeouts
  919. occurred in certain patterns. Fix for bug 957.
  920. o Minor bugfixes:
  921. - When starting with a cache over a few days old, do not leak
  922. memory for the obsolete router descriptors in it. Bugfix on
  923. 0.2.0.33; fixes bug 672.
  924. - Hidden service clients didn't use a cached service descriptor that
  925. was older than 15 minutes, but wouldn't fetch a new one either,
  926. because there was already one in the cache. Now, fetch a v2
  927. descriptor unless the same descriptor was added to the cache within
  928. the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
  929. Changes in version 0.2.0.34 - 2009-02-08
  930. Tor 0.2.0.34 features several more security-related fixes. You should
  931. upgrade, especially if you run an exit relay (remote crash) or a
  932. directory authority (remote infinite loop), or you're on an older
  933. (pre-XP) or not-recently-patched Windows (remote exploit).
  934. This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
  935. have many known flaws, and nobody should be using them. You should
  936. upgrade. If you're using a Linux or BSD and its packages are obsolete,
  937. stop using those packages and upgrade anyway.
  938. o Security fixes:
  939. - Fix an infinite-loop bug on handling corrupt votes under certain
  940. circumstances. Bugfix on 0.2.0.8-alpha.
  941. - Fix a temporary DoS vulnerability that could be performed by
  942. a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
  943. - Avoid a potential crash on exit nodes when processing malformed
  944. input. Remote DoS opportunity. Bugfix on 0.2.0.33.
  945. - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
  946. Spec conformance issue. Bugfix on Tor 0.0.2pre27.
  947. o Minor bugfixes:
  948. - Fix compilation on systems where time_t is a 64-bit integer.
  949. Patch from Matthias Drochner.
  950. - Don't consider expiring already-closed client connections. Fixes
  951. bug 893. Bugfix on 0.0.2pre20.
  952. Changes in version 0.2.0.33 - 2009-01-21
  953. Tor 0.2.0.33 fixes a variety of bugs that were making relays less
  954. useful to users. It also finally fixes a bug where a relay or client
  955. that's been off for many days would take a long time to bootstrap.
  956. This update also fixes an important security-related bug reported by
  957. Ilja van Sprundel. You should upgrade. (We'll send out more details
  958. about the bug once people have had some time to upgrade.)
  959. o Security fixes:
  960. - Fix a heap-corruption bug that may be remotely triggerable on
  961. some platforms. Reported by Ilja van Sprundel.
  962. o Major bugfixes:
  963. - When a stream at an exit relay is in state "resolving" or
  964. "connecting" and it receives an "end" relay cell, the exit relay
  965. would silently ignore the end cell and not close the stream. If
  966. the client never closes the circuit, then the exit relay never
  967. closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
  968. reported by "wood".
  969. - When sending CREATED cells back for a given circuit, use a 64-bit
  970. connection ID to find the right connection, rather than an addr:port
  971. combination. Now that we can have multiple OR connections between
  972. the same ORs, it is no longer possible to use addr:port to uniquely
  973. identify a connection.
  974. - Bridge relays that had DirPort set to 0 would stop fetching
  975. descriptors shortly after startup, and then briefly resume
  976. after a new bandwidth test and/or after publishing a new bridge
  977. descriptor. Bridge users that try to bootstrap from them would
  978. get a recent networkstatus but would get descriptors from up to
  979. 18 hours earlier, meaning most of the descriptors were obsolete
  980. already. Reported by Tas; bugfix on 0.2.0.13-alpha.
  981. - Prevent bridge relays from serving their 'extrainfo' document
  982. to anybody who asks, now that extrainfo docs include potentially
  983. sensitive aggregated client geoip summaries. Bugfix on
  984. 0.2.0.13-alpha.
  985. - If the cached networkstatus consensus is more than five days old,
  986. discard it rather than trying to use it. In theory it could be
  987. useful because it lists alternate directory mirrors, but in practice
  988. it just means we spend many minutes trying directory mirrors that
  989. are long gone from the network. Also discard router descriptors as
  990. we load them if they are more than five days old, since the onion
  991. key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
  992. o Minor bugfixes:
  993. - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
  994. could make gcc generate non-functional binary search code. Bugfix
  995. on 0.2.0.10-alpha.
  996. - Build correctly on platforms without socklen_t.
  997. - Compile without warnings on solaris.
  998. - Avoid potential crash on internal error during signature collection.
  999. Fixes bug 864. Patch from rovv.
  1000. - Correct handling of possible malformed authority signing key
  1001. certificates with internal signature types. Fixes bug 880.
  1002. Bugfix on 0.2.0.3-alpha.
  1003. - Fix a hard-to-trigger resource leak when logging credential status.
  1004. CID 349.
  1005. - When we can't initialize DNS because the network is down, do not
  1006. automatically stop Tor from starting. Instead, we retry failed
  1007. dns_init() every 10 minutes, and change the exit policy to reject
  1008. *:* until one succeeds. Fixes bug 691.
  1009. - Use 64 bits instead of 32 bits for connection identifiers used with
  1010. the controller protocol, to greatly reduce risk of identifier reuse.
  1011. - When we're choosing an exit node for a circuit, and we have
  1012. no pending streams, choose a good general exit rather than one that
  1013. supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
  1014. - Fix another case of assuming, when a specific exit is requested,
  1015. that we know more than the user about what hosts it allows.
  1016. Fixes one case of bug 752. Patch from rovv.
  1017. - Clip the MaxCircuitDirtiness config option to a minimum of 10
  1018. seconds. Warn the user if lower values are given in the
  1019. configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
  1020. - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
  1021. user if lower values are given in the configuration. Bugfix on
  1022. 0.1.1.17-rc. Patch by Sebastian.
  1023. - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
  1024. the cache because we already had a v0 descriptor with the same ID.
  1025. Bugfix on 0.2.0.18-alpha.
  1026. - Fix a race condition when freeing keys shared between main thread
  1027. and CPU workers that could result in a memory leak. Bugfix on
  1028. 0.1.0.1-rc. Fixes bug 889.
  1029. - Send a valid END cell back when a client tries to connect to a
  1030. nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
  1031. 840. Patch from rovv.
  1032. - Check which hops rendezvous stream cells are associated with to
  1033. prevent possible guess-the-streamid injection attacks from
  1034. intermediate hops. Fixes another case of bug 446. Based on patch
  1035. from rovv.
  1036. - If a broken client asks a non-exit router to connect somewhere,
  1037. do not even do the DNS lookup before rejecting the connection.
  1038. Fixes another case of bug 619. Patch from rovv.
  1039. - When a relay gets a create cell it can't decrypt (e.g. because it's
  1040. using the wrong onion key), we were dropping it and letting the
  1041. client time out. Now actually answer with a destroy cell. Fixes
  1042. bug 904. Bugfix on 0.0.2pre8.
  1043. o Minor bugfixes (hidden services):
  1044. - Do not throw away existing introduction points on SIGHUP. Bugfix on
  1045. 0.0.6pre1. Patch by Karsten. Fixes bug 874.
  1046. o Minor features:
  1047. - Report the case where all signatures in a detached set are rejected
  1048. differently than the case where there is an error handling the
  1049. detached set.
  1050. - When we realize that another process has modified our cached
  1051. descriptors, print out a more useful error message rather than
  1052. triggering an assertion. Fixes bug 885. Patch from Karsten.
  1053. - Implement the 0x20 hack to better resist DNS poisoning: set the
  1054. case on outgoing DNS requests randomly, and reject responses that do
  1055. not match the case correctly. This logic can be disabled with the
  1056. ServerDNSRamdomizeCase setting, if you are using one of the 0.3%
  1057. of servers that do not reliably preserve case in replies. See
  1058. "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
  1059. for more info.
  1060. - Check DNS replies for more matching fields to better resist DNS
  1061. poisoning.
  1062. - Never use OpenSSL compression: it wastes RAM and CPU trying to
  1063. compress cells, which are basically all encrypted, compressed, or
  1064. both.
  1065. Changes in version 0.2.0.32 - 2008-11-20
  1066. Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
  1067. packages (and maybe other packages) noticed by Theo de Raadt, fixes
  1068. a smaller security flaw that might allow an attacker to access local
  1069. services, further improves hidden service performance, and fixes a
  1070. variety of other issues.
  1071. o Security fixes:
  1072. - The "User" and "Group" config options did not clear the
  1073. supplementary group entries for the Tor process. The "User" option
  1074. is now more robust, and we now set the groups to the specified
  1075. user's primary group. The "Group" option is now ignored. For more
  1076. detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
  1077. in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
  1078. and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
  1079. - The "ClientDNSRejectInternalAddresses" config option wasn't being
  1080. consistently obeyed: if an exit relay refuses a stream because its
  1081. exit policy doesn't allow it, we would remember what IP address
  1082. the relay said the destination address resolves to, even if it's
  1083. an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
  1084. o Major bugfixes:
  1085. - Fix a DOS opportunity during the voting signature collection process
  1086. at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
  1087. o Major bugfixes (hidden services):
  1088. - When fetching v0 and v2 rendezvous service descriptors in parallel,
  1089. we were failing the whole hidden service request when the v0
  1090. descriptor fetch fails, even if the v2 fetch is still pending and
  1091. might succeed. Similarly, if the last v2 fetch fails, we were
  1092. failing the whole hidden service request even if a v0 fetch is
  1093. still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
  1094. - When extending a circuit to a hidden service directory to upload a
  1095. rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
  1096. requests failed, because the router descriptor has not been
  1097. downloaded yet. In these cases, do not attempt to upload the
  1098. rendezvous descriptor, but wait until the router descriptor is
  1099. downloaded and retry. Likewise, do not attempt to fetch a rendezvous
  1100. descriptor from a hidden service directory for which the router
  1101. descriptor has not yet been downloaded. Fixes bug 767. Bugfix
  1102. on 0.2.0.10-alpha.
  1103. o Minor bugfixes:
  1104. - Fix several infrequent memory leaks spotted by Coverity.
  1105. - When testing for libevent functions, set the LDFLAGS variable
  1106. correctly. Found by Riastradh.
  1107. - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
  1108. bootstrapping with tunneled directory connections. Bugfix on
  1109. 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
  1110. - When asked to connect to A.B.exit:80, if we don't know the IP for A
  1111. and we know that server B rejects most-but-not all connections to
  1112. port 80, we would previously reject the connection. Now, we assume
  1113. the user knows what they were asking for. Fixes bug 752. Bugfix
  1114. on 0.0.9rc5. Diagnosed by BarkerJr.
  1115. - If we overrun our per-second write limits a little, count this as
  1116. having used up our write allocation for the second, and choke
  1117. outgoing directory writes. Previously, we had only counted this when
  1118. we had met our limits precisely. Fixes bug 824. Patch from by rovv.
  1119. Bugfix on 0.2.0.x (??).
  1120. - Remove the old v2 directory authority 'lefkada' from the default
  1121. list. It has been gone for many months.
  1122. - Stop doing unaligned memory access that generated bus errors on
  1123. sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
  1124. - Make USR2 log-level switch take effect immediately. Bugfix on
  1125. 0.1.2.8-beta.
  1126. o Minor bugfixes (controller):
  1127. - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
  1128. 0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
  1129. Changes in version 0.2.0.31 - 2008-09-03
  1130. Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
  1131. a big bug we're seeing where in rare cases traffic from one Tor stream
  1132. gets mixed into another stream, and fixes a variety of smaller issues.
  1133. o Major bugfixes:
  1134. - Make sure that two circuits can never exist on the same connection
  1135. with the same circuit ID, even if one is marked for close. This
  1136. is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
  1137. - Relays now reject risky extend cells: if the extend cell includes
  1138. a digest of all zeroes, or asks to extend back to the relay that
  1139. sent the extend cell, tear down the circuit. Ideas suggested
  1140. by rovv.
  1141. - If not enough of our entry guards are available so we add a new
  1142. one, we might use the new one even if it overlapped with the
  1143. current circuit's exit relay (or its family). Anonymity bugfix
  1144. pointed out by rovv.
  1145. o Minor bugfixes:
  1146. - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
  1147. 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
  1148. - Correctly detect the presence of the linux/netfilter_ipv4.h header
  1149. when building against recent kernels. Bugfix on 0.1.2.1-alpha.
  1150. - Pick size of default geoip filename string correctly on windows.
  1151. Fixes bug 806. Bugfix on 0.2.0.30.
  1152. - Make the autoconf script accept the obsolete --with-ssl-dir
  1153. option as an alias for the actually-working --with-openssl-dir
  1154. option. Fix the help documentation to recommend --with-openssl-dir.
  1155. Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
  1156. - When using the TransPort option on OpenBSD, and using the User
  1157. option to change UID and drop privileges, make sure to open
  1158. /dev/pf before dropping privileges. Fixes bug 782. Patch from
  1159. Christopher Davis. Bugfix on 0.1.2.1-alpha.
  1160. - Try to attach connections immediately upon receiving a RENDEZVOUS2
  1161. or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
  1162. on the client side when connecting to a hidden service. Bugfix
  1163. on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
  1164. - When closing an application-side connection because its circuit is
  1165. getting torn down, generate the stream event correctly. Bugfix on
  1166. 0.1.2.x. Anonymous patch.
  1167. Changes in version 0.2.0.30 - 2008-07-15
  1168. This new stable release switches to a more efficient directory
  1169. distribution design, adds features to make connections to the Tor
  1170. network harder to block, allows Tor to act as a DNS proxy, adds separate
  1171. rate limiting for relayed traffic to make it easier for clients to
  1172. become relays, fixes a variety of potential anonymity problems, and
  1173. includes the usual huge pile of other features and bug fixes.
  1174. o New v3 directory design:
  1175. - Tor now uses a new way to learn about and distribute information
  1176. about the network: the directory authorities vote on a common
  1177. network status document rather than each publishing their own
  1178. opinion. Now clients and caches download only one networkstatus
  1179. document to bootstrap, rather than downloading one for each
  1180. authority. Clients only download router descriptors listed in
  1181. the consensus. Implements proposal 101; see doc/spec/dir-spec.txt
  1182. for details.
  1183. - Set up moria1, tor26, and dizum as v3 directory authorities
  1184. in addition to being v2 authorities. Also add three new ones:
  1185. ides (run by Mike Perry), gabelmoo (run by Karsten Loesing), and
  1186. dannenberg (run by CCC).
  1187. - Switch to multi-level keys for directory authorities: now their
  1188. long-term identity key can be kept offline, and they periodically
  1189. generate a new signing key. Clients fetch the "key certificates"
  1190. to keep up to date on the right keys. Add a standalone tool
  1191. "tor-gencert" to generate key certificates. Implements proposal 103.
  1192. - Add a new V3AuthUseLegacyKey config option to make it easier for
  1193. v3 authorities to change their identity keys if another bug like
  1194. Debian's OpenSSL RNG flaw appears.
  1195. - Authorities and caches fetch the v2 networkstatus documents
  1196. less often, now that v3 is recommended.
  1197. o Make Tor connections stand out less on the wire:
  1198. - Use an improved TLS handshake designed by Steven Murdoch in proposal
  1199. 124, as revised in proposal 130. The new handshake is meant to
  1200. be harder for censors to fingerprint, and it adds the ability
  1201. to detect certain kinds of man-in-the-middle traffic analysis
  1202. attacks. The new handshake format includes version negotiation for
  1203. OR connections as described in proposal 105, which will allow us
  1204. to improve Tor's link protocol more safely in the future.
  1205. - Enable encrypted directory connections by default for non-relays,
  1206. so censor tools that block Tor directory connections based on their
  1207. plaintext patterns will no longer work. This means Tor works in
  1208. certain censored countries by default again.
  1209. - Stop including recognizeable strings in the commonname part of
  1210. Tor's x509 certificates.
  1211. o Implement bridge relays:
  1212. - Bridge relays (or "bridges" for short) are Tor relays that aren't
  1213. listed in the main Tor directory. Since there is no complete public
  1214. list of them, even an ISP that is filtering connections to all the
  1215. known Tor relays probably won't be able to block all the bridges.
  1216. See doc/design-paper/blocking.pdf and proposal 125 for details.
  1217. - New config option BridgeRelay that specifies you want to be a
  1218. bridge relay rather than a normal relay. When BridgeRelay is set
  1219. to 1, then a) you cache dir info even if your DirPort ins't on,
  1220. and b) the default for PublishServerDescriptor is now "bridge"
  1221. rather than "v2,v3".
  1222. - New config option "UseBridges 1" for clients that want to use bridge
  1223. relays instead of ordinary entry guards. Clients then specify
  1224. bridge relays by adding "Bridge" lines to their config file. Users
  1225. can learn about a bridge relay either manually through word of
  1226. mouth, or by one of our rate-limited mechanisms for giving out
  1227. bridge addresses without letting an attacker easily enumerate them
  1228. all. See https://www.torproject.org/bridges for details.
  1229. - Bridge relays behave like clients with respect to time intervals
  1230. for downloading new v3 consensus documents -- otherwise they
  1231. stand out. Bridge users now wait until the end of the interval,
  1232. so their bridge relay will be sure to have a new consensus document.
  1233. o Implement bridge directory authorities:
  1234. - Bridge authorities are like normal directory authorities, except
  1235. they don't serve a list of known bridges. Therefore users that know
  1236. a bridge's fingerprint can fetch a relay descriptor for that bridge,
  1237. including fetching updates e.g. if the bridge changes IP address,
  1238. yet an attacker can't just fetch a list of all the bridges.
  1239. - Set up Tonga as the default bridge directory authority.
  1240. - Bridge authorities refuse to serve bridge descriptors or other
  1241. bridge information over unencrypted connections (that is, when
  1242. responding to direct DirPort requests rather than begin_dir cells.)
  1243. - Bridge directory authorities do reachability testing on the
  1244. bridges they know. They provide router status summaries to the
  1245. controller via "getinfo ns/purpose/bridge", and also dump summaries
  1246. to a file periodically, so we can keep internal stats about which
  1247. bridges are functioning.
  1248. - If bridge users set the UpdateBridgesFromAuthority config option,
  1249. but the digest they ask for is a 404 on the bridge authority,
  1250. they fall back to contacting the bridge directly.
  1251. - Bridges always use begin_dir to publish their server descriptor to
  1252. the bridge authority using an anonymous encrypted tunnel.
  1253. - Early work on a "bridge community" design: if bridge authorities set
  1254. the BridgePassword config option, they will serve a snapshot of
  1255. known bridge routerstatuses from their DirPort to anybody who
  1256. knows that password. Unset by default.
  1257. - Tor now includes an IP-to-country GeoIP file, so bridge relays can
  1258. report sanitized aggregated summaries in their extra-info documents
  1259. privately to the bridge authority, listing which countries are
  1260. able to reach them. We hope this mechanism will let us learn when
  1261. certain countries start trying to block bridges.
  1262. - Bridge authorities write bridge descriptors to disk, so they can
  1263. reload them after a reboot. They can also export the descriptors
  1264. to other programs, so we can distribute them to blocked users via
  1265. the BridgeDB interface, e.g. via https://bridges.torproject.org/
  1266. and bridges@torproject.org.
  1267. o Tor can be a DNS proxy:
  1268. - The new client-side DNS proxy feature replaces the need for
  1269. dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
  1270. for DNS requests on port 9999, use the Tor network to resolve them
  1271. anonymously, and send the reply back like a regular DNS server.
  1272. The code still only implements a subset of DNS.
  1273. - Add a new AutomapHostsOnResolve option: when it is enabled, any
  1274. resolve request for hosts matching a given pattern causes Tor to
  1275. generate an internal virtual address mapping for that host. This
  1276. allows DNSPort to work sensibly with hidden service users. By
  1277. default, .exit and .onion addresses are remapped; the list of
  1278. patterns can be reconfigured with AutomapHostsSuffixes.
  1279. - Add an "-F" option to tor-resolve to force a resolve for a .onion
  1280. address. Thanks to the AutomapHostsOnResolve option, this is no
  1281. longer a completely silly thing to do.
  1282. o Major features (relay usability):
  1283. - New config options RelayBandwidthRate and RelayBandwidthBurst:
  1284. a separate set of token buckets for relayed traffic. Right now
  1285. relayed traffic is defined as answers to directory requests, and
  1286. OR connections that don't have any local circuits on them. See
  1287. proposal 111 for details.
  1288. - Create listener connections before we setuid to the configured
  1289. User and Group. Now non-Windows users can choose port values
  1290. under 1024, start Tor as root, and have Tor bind those ports
  1291. before it changes to another UID. (Windows users could already
  1292. pick these ports.)
  1293. - Added a new ConstrainedSockets config option to set SO_SNDBUF and
  1294. SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
  1295. on "vserver" accounts. Patch from coderman.
  1296. o Major features (directory authorities):
  1297. - Directory authorities track weighted fractional uptime and weighted
  1298. mean-time-between failures for relays. WFU is suitable for deciding
  1299. whether a node is "usually up", while MTBF is suitable for deciding
  1300. whether a node is "likely to stay up." We need both, because
  1301. "usually up" is a good requirement for guards, while "likely to
  1302. stay up" is a good requirement for long-lived connections.
  1303. - Directory authorities use a new formula for selecting which relays
  1304. to advertise as Guards: they must be in the top 7/8 in terms of
  1305. how long we have known about them, and above the median of those
  1306. nodes in terms of weighted fractional uptime.
  1307. - Directory authorities use a new formula for selecting which relays
  1308. to advertise as Stable: when we have 4 or more days of data, use
  1309. median measured MTBF rather than median declared uptime. Implements
  1310. proposal 108.
  1311. - Directory authorities accept and serve "extra info" documents for
  1312. routers. Routers now publish their bandwidth-history lines in the
  1313. extra-info docs rather than the main descriptor. This step saves
  1314. 60% (!) on compressed router descriptor downloads. Servers upload
  1315. extra-info docs to any authority that accepts them; directory
  1316. authorities now allow multiple router descriptors and/or extra
  1317. info documents to be uploaded in a single go. Authorities, and
  1318. caches that have been configured to download extra-info documents,
  1319. download them as needed. Implements proposal 104.
  1320. - Authorities now list relays who have the same nickname as
  1321. a different named relay, but list them with a new flag:
  1322. "Unnamed". Now we can make use of relays that happen to pick the
  1323. same nickname as a server that registered two years ago and then
  1324. disappeared. Implements proposal 122.
  1325. - Store routers in a file called cached-descriptors instead of in
  1326. cached-routers. Initialize cached-descriptors from cached-routers
  1327. if the old format is around. The new format allows us to store
  1328. annotations along with descriptors, to record the time we received
  1329. each descriptor, its source, and its purpose: currently one of
  1330. general, controller, or bridge.
  1331. o Major features (other):
  1332. - New config options WarnPlaintextPorts and RejectPlaintextPorts so
  1333. Tor can warn and/or refuse connections to ports commonly used with
  1334. vulnerable-plaintext protocols. Currently we warn on ports 23,
  1335. 109, 110, and 143, but we don't reject any. Based on proposal 129
  1336. by Kevin Bauer and Damon McCoy.
  1337. - Integrate Karsten Loesing's Google Summer of Code project to publish
  1338. hidden service descriptors on a set of redundant relays that are a
  1339. function of the hidden service address. Now we don't have to rely
  1340. on three central hidden service authorities for publishing and
  1341. fetching every hidden service descriptor. Implements proposal 114.
  1342. - Allow tunnelled directory connections to ask for an encrypted
  1343. "begin_dir" connection or an anonymized "uses a full Tor circuit"
  1344. connection independently. Now we can make anonymized begin_dir
  1345. connections for (e.g.) more secure hidden service posting and
  1346. fetching.
  1347. o Major bugfixes (crashes and assert failures):
  1348. - Stop imposing an arbitrary maximum on the number of file descriptors
  1349. used for busy servers. Bug reported by Olaf Selke; patch from
  1350. Sebastian Hahn.
  1351. - Avoid possible failures when generating a directory with routers
  1352. with over-long versions strings, or too many flags set.
  1353. - Fix a rare assert error when we're closing one of our threads:
  1354. use a mutex to protect the list of logs, so we never write to the
  1355. list as it's being freed. Fixes the very rare bug 575, which is
  1356. kind of the revenge of bug 222.
  1357. - Avoid segfault in the case where a badly behaved v2 versioning
  1358. directory sends a signed networkstatus with missing client-versions.
  1359. - When we hit an EOF on a log (probably because we're shutting down),
  1360. don't try to remove the log from the list: just mark it as
  1361. unusable. (Bulletproofs against bug 222.)
  1362. o Major bugfixes (code security fixes):
  1363. - Detect size overflow in zlib code. Reported by Justin Ferguson and
  1364. Dan Kaminsky.
  1365. - Rewrite directory tokenization code to never run off the end of
  1366. a string. Fixes bug 455. Patch from croup.
  1367. - Be more paranoid about overwriting sensitive memory on free(),
  1368. as a defensive programming tactic to ensure forward secrecy.
  1369. o Major bugfixes (anonymity fixes):
  1370. - Reject requests for reverse-dns lookup of names that are in
  1371. a private address space. Patch from lodger.
  1372. - Never report that we've used more bandwidth than we're willing to
  1373. relay: it leaks how much non-relay traffic we're using. Resolves
  1374. bug 516.
  1375. - As a client, do not believe any server that tells us that an
  1376. address maps to an internal address space.
  1377. - Warn about unsafe ControlPort configurations.
  1378. - Directory authorities now call routers Fast if their bandwidth is
  1379. at least 100KB/s, and consider their bandwidth adequate to be a
  1380. Guard if it is at least 250KB/s, no matter the medians. This fix
  1381. complements proposal 107.
  1382. - Directory authorities now never mark more than 2 servers per IP as
  1383. Valid and Running (or 5 on addresses shared by authorities).
  1384. Implements proposal 109, by Kevin Bauer and Damon McCoy.
  1385. - If we're a relay, avoid picking ourselves as an introduction point,
  1386. a rendezvous point, or as the final hop for internal circuits. Bug
  1387. reported by taranis and lodger.
  1388. - Exit relays that are used as a client can now reach themselves
  1389. using the .exit notation, rather than just launching an infinite
  1390. pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
  1391. - Fix a bug where, when we were choosing the 'end stream reason' to
  1392. put in our relay end cell that we send to the exit relay, Tor
  1393. clients on Windows were sometimes sending the wrong 'reason'. The
  1394. anonymity problem is that exit relays may be able to guess whether
  1395. the client is running Windows, thus helping partition the anonymity
  1396. set. Down the road we should stop sending reasons to exit relays,
  1397. or otherwise prevent future versions of this bug.
  1398. - Only update guard status (usable / not usable) once we have
  1399. enough directory information. This was causing us to discard all our
  1400. guards on startup if we hadn't been running for a few weeks. Fixes
  1401. bug 448.
  1402. - When our directory information has been expired for a while, stop
  1403. being willing to build circuits using it. Fixes bug 401.
  1404. o Major bugfixes (peace of mind for relay operators)
  1405. - Non-exit relays no longer answer "resolve" relay cells, so they
  1406. can't be induced to do arbitrary DNS requests. (Tor clients already
  1407. avoid using non-exit relays for resolve cells, but now servers
  1408. enforce this too.) Fixes bug 619. Patch from lodger.
  1409. - When we setconf ClientOnly to 1, close any current OR and Dir
  1410. listeners. Reported by mwenge.
  1411. o Major bugfixes (other):
  1412. - If we only ever used Tor for hidden service lookups or posts, we
  1413. would stop building circuits and start refusing connections after
  1414. 24 hours, since we falsely believed that Tor was dormant. Reported
  1415. by nwf.
  1416. - Add a new __HashedControlSessionPassword option for controllers
  1417. to use for one-off session password hashes that shouldn't get
  1418. saved to disk by SAVECONF --- Vidalia users were accumulating a
  1419. pile of HashedControlPassword lines in their torrc files, one for
  1420. each time they had restarted Tor and then clicked Save. Make Tor
  1421. automatically convert "HashedControlPassword" to this new option but
  1422. only when it's given on the command line. Partial fix for bug 586.
  1423. - Patch from "Andrew S. Lists" to catch when we contact a directory
  1424. mirror at IP address X and he says we look like we're coming from
  1425. IP address X. Otherwise this would screw up our address detection.
  1426. - Reject uploaded descriptors and extrainfo documents if they're
  1427. huge. Otherwise we'll cache them all over the network and it'll
  1428. clog everything up. Suggested by Aljosha Judmayer.
  1429. - When a hidden service was trying to establish an introduction point,
  1430. and Tor *did* manage to reuse one of the preemptively built
  1431. circuits, it didn't correctly remember which one it used,
  1432. so it asked for another one soon after, until there were no
  1433. more preemptive circuits, at which point it launched one from
  1434. scratch. Bugfix on 0.0.9.x.
  1435. o Rate limiting and load balancing improvements:
  1436. - When we add data to a write buffer in response to the data on that
  1437. write buffer getting low because of a flush, do not consider the
  1438. newly added data as a candidate for immediate flushing, but rather
  1439. make it wait until the next round of writing. Otherwise, we flush
  1440. and refill recursively, and a single greedy TLS connection can
  1441. eat all of our bandwidth.
  1442. - When counting the number of bytes written on a TLS connection,
  1443. look at the BIO actually used for writing to the network, not
  1444. at the BIO used (sometimes) to buffer data for the network.
  1445. Looking at different BIOs could result in write counts on the
  1446. order of ULONG_MAX. Fixes bug 614.
  1447. - If we change our MaxAdvertisedBandwidth and then reload torrc,
  1448. Tor won't realize it should publish a new relay descriptor. Fixes
  1449. bug 688, reported by mfr.
  1450. - Avoid using too little bandwidth when our clock skips a few seconds.
  1451. - Choose which bridge to use proportional to its advertised bandwidth,
  1452. rather than uniformly at random. This should speed up Tor for
  1453. bridge users. Also do this for people who set StrictEntryNodes.
  1454. o Bootstrapping faster and building circuits more intelligently:
  1455. - Fix bug 660 that was preventing us from knowing that we should
  1456. preemptively build circuits to handle expected directory requests.
  1457. - When we're checking if we have enough dir info for each relay
  1458. to begin establishing circuits, make sure that we actually have
  1459. the descriptor listed in the consensus, not just any descriptor.
  1460. - Correctly notify one-hop connections when a circuit build has
  1461. failed. Possible fix for bug 669. Found by lodger.
  1462. - Clients now hold circuitless TLS connections open for 1.5 times
  1463. MaxCircuitDirtiness (15 minutes), since it is likely that they'll
  1464. rebuild a new circuit over them within that timeframe. Previously,
  1465. they held them open only for KeepalivePeriod (5 minutes).
  1466. o Performance improvements (memory):
  1467. - Add OpenBSD malloc code from "phk" as an optional malloc
  1468. replacement on Linux: some glibc libraries do very poorly with
  1469. Tor's memory allocation patterns. Pass --enable-openbsd-malloc to
  1470. ./configure to get the replacement malloc code.
  1471. - Switch our old ring buffer implementation for one more like that
  1472. used by free Unix kernels. The wasted space in a buffer with 1mb
  1473. of data will now be more like 8k than 1mb. The new implementation
  1474. also avoids realloc();realloc(); patterns that can contribute to
  1475. memory fragmentation.
  1476. - Change the way that Tor buffers data that it is waiting to write.
  1477. Instead of queueing data cells in an enormous ring buffer for each
  1478. client->OR or OR->OR connection, we now queue cells on a separate
  1479. queue for each circuit. This lets us use less slack memory, and
  1480. will eventually let us be smarter about prioritizing different kinds
  1481. of traffic.
  1482. - Reference-count and share copies of address policy entries; only 5%
  1483. of them were actually distinct.
  1484. - Tune parameters for cell pool allocation to minimize amount of
  1485. RAM overhead used.
  1486. - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
  1487. for every single inactive connection_t. Free items from the
  1488. 4k/16k-buffer free lists when they haven't been used for a while.
  1489. - Make memory debugging information describe more about history
  1490. of cell allocation, so we can help reduce our memory use.
  1491. - Be even more aggressive about releasing RAM from small
  1492. empty buffers. Thanks to our free-list code, this shouldn't be too
  1493. performance-intensive.
  1494. - Log malloc statistics from mallinfo() on platforms where it exists.
  1495. - Use memory pools to allocate cells with better speed and memory
  1496. efficiency, especially on platforms where malloc() is inefficient.
  1497. - Add a --with-tcmalloc option to the configure script to link
  1498. against tcmalloc (if present). Does not yet search for non-system
  1499. include paths.
  1500. o Performance improvements (socket management):
  1501. - Count the number of open sockets separately from the number of
  1502. active connection_t objects. This will let us avoid underusing
  1503. our allocated connection limit.
  1504. - We no longer use socket pairs to link an edge connection to an
  1505. anonymous directory connection or a DirPort test connection.
  1506. Instead, we track the link internally and transfer the data
  1507. in-process. This saves two sockets per "linked" connection (at the
  1508. client and at the server), and avoids the nasty Windows socketpair()
  1509. workaround.
  1510. - We were leaking a file descriptor if Tor started with a zero-length
  1511. cached-descriptors file. Patch by "freddy77".
  1512. o Performance improvements (CPU use):
  1513. - Never walk through the list of logs if we know that no log target
  1514. is interested in a given message.
  1515. - Call routerlist_remove_old_routers() much less often. This should
  1516. speed startup, especially on directory caches.
  1517. - Base64 decoding was actually showing up on our profile when parsing
  1518. the initial descriptor file; switch to an in-process all-at-once
  1519. implementation that's about 3.5x times faster than calling out to
  1520. OpenSSL.
  1521. - Use a slightly simpler string hashing algorithm (copying Python's
  1522. instead of Java's) and optimize our digest hashing algorithm to take
  1523. advantage of 64-bit platforms and to remove some possibly-costly
  1524. voodoo.
  1525. - When implementing AES counter mode, update only the portions of the
  1526. counter buffer that need to change, and don't keep separate
  1527. network-order and host-order counters on big-endian hosts (where
  1528. they are the same).
  1529. - Add an in-place version of aes_crypt() so that we can avoid doing a
  1530. needless memcpy() call on each cell payload.
  1531. - Use Critical Sections rather than Mutexes for synchronizing threads
  1532. on win32; Mutexes are heavier-weight, and designed for synchronizing
  1533. between processes.
  1534. o Performance improvements (bandwidth use):
  1535. - Don't try to launch new descriptor downloads quite so often when we
  1536. already have enough directory information to build circuits.
  1537. - Version 1 directories are no longer generated in full. Instead,
  1538. authorities generate and serve "stub" v1 directories that list
  1539. no servers. This will stop Tor versions 0.1.0.x and earlier from
  1540. working, but (for security reasons) nobody should be running those
  1541. versions anyway.
  1542. - Avoid going directly to the directory authorities even if you're a
  1543. relay, if you haven't found yourself reachable yet or if you've
  1544. decided not to advertise your dirport yet. Addresses bug 556.
  1545. - If we've gone 12 hours since our last bandwidth check, and we
  1546. estimate we have less than 50KB bandwidth capacity but we could
  1547. handle more, do another bandwidth test.
  1548. - Support "If-Modified-Since" when answering HTTP requests for
  1549. directories, running-routers documents, and v2 and v3 networkstatus
  1550. documents. (There's no need to support it for router descriptors,
  1551. since those are downloaded by descriptor digest.)
  1552. - Stop fetching directory info so aggressively if your DirPort is
  1553. on but your ORPort is off; stop fetching v2 dir info entirely.
  1554. You can override these choices with the new FetchDirInfoEarly
  1555. config option.
  1556. o Changed config option behavior (features):
  1557. - Configuration files now accept C-style strings as values. This
  1558. helps encode characters not allowed in the current configuration
  1559. file format, such as newline or #. Addresses bug 557.
  1560. - Add hidden services and DNSPorts to the list of things that make
  1561. Tor accept that it has running ports. Change starting Tor with no
  1562. ports from a fatal error to a warning; we might change it back if
  1563. this turns out to confuse anybody. Fixes bug 579.
  1564. - Make PublishServerDescriptor default to 1, so the default doesn't
  1565. have to change as we invent new directory protocol versions.
  1566. - Allow people to say PreferTunnelledDirConns rather than
  1567. PreferTunneledDirConns, for those alternate-spellers out there.
  1568. - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
  1569. accommodate the growing number of servers that use the default
  1570. and are reaching it.
  1571. - Make it possible to enable HashedControlPassword and
  1572. CookieAuthentication at the same time.
  1573. - When a TrackHostExits-chosen exit fails too many times in a row,
  1574. stop using it. Fixes bug 437.
  1575. o Changed config option behavior (bugfixes):
  1576. - Do not read the configuration file when we've only been told to
  1577. generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
  1578. based on patch from Sebastian Hahn.
  1579. - Actually validate the options passed to AuthDirReject,
  1580. AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
  1581. - Make "ClientOnly 1" config option disable directory ports too.
  1582. - Don't stop fetching descriptors when FetchUselessDescriptors is
  1583. set, even if we stop asking for circuits. Bug reported by tup
  1584. and ioerror.
  1585. - Servers used to decline to publish their DirPort if their
  1586. BandwidthRate or MaxAdvertisedBandwidth were below a threshold. Now
  1587. they look only at BandwidthRate and RelayBandwidthRate.
  1588. - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
  1589. minus 1 byte: the actual maximum declared bandwidth.
  1590. - Make "TrackHostExits ." actually work. Bugfix on 0.1.0.x.
  1591. - Make the NodeFamilies config option work. (Reported by
  1592. lodger -- it has never actually worked, even though we added it
  1593. in Oct 2004.)
  1594. - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
  1595. now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
  1596. o New config options:
  1597. - New configuration options AuthDirMaxServersPerAddr and
  1598. AuthDirMaxServersperAuthAddr to override default maximum number
  1599. of servers allowed on a single IP address. This is important for
  1600. running a test network on a single host.
  1601. - Three new config options (AlternateDirAuthority,
  1602. AlternateBridgeAuthority, and AlternateHSAuthority) that let the
  1603. user selectively replace the default directory authorities by type,
  1604. rather than the all-or-nothing replacement that DirServer offers.
  1605. - New config options AuthDirBadDir and AuthDirListBadDirs for
  1606. authorities to mark certain relays as "bad directories" in the
  1607. networkstatus documents. Also supports the "!baddir" directive in
  1608. the approved-routers file.
  1609. - New config option V2AuthoritativeDirectory that all v2 directory
  1610. authorities must set. This lets v3 authorities choose not to serve
  1611. v2 directory information.
  1612. o Minor features (other):
  1613. - When we're not serving v2 directory information, there is no reason
  1614. to actually keep any around. Remove the obsolete files and directory
  1615. on startup if they are very old and we aren't going to serve them.
  1616. - When we negotiate a v2 link-layer connection (not yet implemented),
  1617. accept RELAY_EARLY cells and turn them into RELAY cells if we've
  1618. negotiated a v1 connection for their next step. Initial steps for
  1619. proposal 110.
  1620. - When we have no consensus, check FallbackNetworkstatusFile (defaults
  1621. to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
  1622. we can start out knowing some directory caches. We don't ship with
  1623. a fallback consensus by default though, because it was making
  1624. bootstrapping take too long while we tried many down relays.
  1625. - Authorities send back an X-Descriptor-Not-New header in response to
  1626. an accepted-but-discarded descriptor upload. Partially implements
  1627. fix for bug 535.
  1628. - If we find a cached-routers file that's been sitting around for more
  1629. than 28 days unmodified, then most likely it's a leftover from
  1630. when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
  1631. routers anyway.
  1632. - When we (as a cache) download a descriptor because it was listed
  1633. in a consensus, remember when the consensus was supposed to expire,
  1634. and don't expire the descriptor until then.
  1635. - Optionally (if built with -DEXPORTMALLINFO) export the output
  1636. of mallinfo via http, as tor/mallinfo.txt. Only accessible
  1637. from localhost.
  1638. - Tag every guard node in our state file with the version that
  1639. we believe added it, or with our own version if we add it. This way,
  1640. if a user temporarily runs an old version of Tor and then switches
  1641. back to a new one, she doesn't automatically lose her guards.
  1642. - When somebody requests a list of statuses or servers, and we have
  1643. none of those, return a 404 rather than an empty 200.
  1644. - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
  1645. from croup.)
  1646. - Add an HSAuthorityRecordStats option that hidden service authorities
  1647. can use to track statistics of overall hidden service usage without
  1648. logging information that would be as useful to an attacker.
  1649. - Allow multiple HiddenServicePort directives with the same virtual
  1650. port; when they occur, the user is sent round-robin to one
  1651. of the target ports chosen at random. Partially fixes bug 393 by
  1652. adding limited ad-hoc round-robining.
  1653. - Revamp file-writing logic so we don't need to have the entire
  1654. contents of a file in memory at once before we write to disk. Tor,
  1655. meet stdio.
  1656. o Minor bugfixes (other):
  1657. - Alter the code that tries to recover from unhandled write
  1658. errors, to not try to flush onto a socket that's given us
  1659. unhandled errors.
  1660. - Directory mirrors no longer include a guess at the client's IP
  1661. address if the connection appears to be coming from the same /24
  1662. network; it was producing too many wrong guesses.
  1663. - If we're trying to flush the last bytes on a connection (for
  1664. example, when answering a directory request), reset the
  1665. time-to-give-up timeout every time we manage to write something
  1666. on the socket.
  1667. - Reject router descriptors with out-of-range bandwidthcapacity or
  1668. bandwidthburst values.
  1669. - If we can't expand our list of entry guards (e.g. because we're
  1670. using bridges or we have StrictEntryNodes set), don't mark relays
  1671. down when they fail a directory request. Otherwise we're too quick
  1672. to mark all our entry points down.
  1673. - Authorities no longer send back "400 you're unreachable please fix
  1674. it" errors to Tor servers that aren't online all the time. We're
  1675. supposed to tolerate these servers now.
  1676. - Let directory authorities startup even when they can't generate
  1677. a descriptor immediately, e.g. because they don't know their
  1678. address.
  1679. - Correctly enforce that elements of directory objects do not appear
  1680. more often than they are allowed to appear.
  1681. - Stop allowing hibernating servers to be "stable" or "fast".
  1682. - On Windows, we were preventing other processes from reading
  1683. cached-routers while Tor was running. (Reported by janbar)
  1684. - Check return values from pthread_mutex functions.
  1685. - When opening /dev/null in finish_daemonize(), do not pass the
  1686. O_CREAT flag. Fortify was complaining, and correctly so. Fixes
  1687. bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
  1688. o Controller features:
  1689. - The GETCONF command now escapes and quotes configuration values
  1690. that don't otherwise fit into the torrc file.
  1691. - The SETCONF command now handles quoted values correctly.
  1692. - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
  1693. ask about source, timestamp of arrival, purpose, etc. We need
  1694. something like this to help Vidalia not do GeoIP lookups on bridge
  1695. addresses.
  1696. - Allow multiple HashedControlPassword config lines, to support
  1697. multiple controller passwords.
  1698. - Accept LF instead of CRLF on controller, since some software has a
  1699. hard time generating real Internet newlines.
  1700. - Add GETINFO values for the server status events
  1701. "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
  1702. Robert Hogan.
  1703. - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
  1704. GETINFO for Torstat to use until it can switch to using extrainfos.
  1705. - New config option CookieAuthFile to choose a new location for the
  1706. cookie authentication file, and config option
  1707. CookieAuthFileGroupReadable to make it group-readable.
  1708. - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
  1709. match requests to applications. Patch from Robert Hogan.
  1710. - Add a RESOLVE command to launch hostname lookups. Original patch
  1711. from Robert Hogan.
  1712. - Add GETINFO status/enough-dir-info to let controllers tell whether
  1713. Tor has downloaded sufficient directory information. Patch from Tup.
  1714. - You can now use the ControlSocket option to tell Tor to listen for
  1715. controller connections on Unix domain sockets on systems that
  1716. support them. Patch from Peter Palfrader.
  1717. - New "GETINFO address-mappings/*" command to get address mappings
  1718. with expiry information. "addr-mappings/*" is now deprecated.
  1719. Patch from Tup.
  1720. - Add a new config option __DisablePredictedCircuits designed for
  1721. use by the controller, when we don't want Tor to build any circuits
  1722. preemptively.
  1723. - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
  1724. so we can exit from the middle of the circuit.
  1725. - Implement "getinfo status/circuit-established".
  1726. - Implement "getinfo status/version/..." so a controller can tell
  1727. whether the current version is recommended, and whether any versions
  1728. are good, and how many authorities agree. Patch from "shibz".
  1729. - Controllers should now specify cache=no or cache=yes when using
  1730. the +POSTDESCRIPTOR command.
  1731. - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
  1732. Robert Hogan. Fixes the first part of bug 681.
  1733. - When reporting clock skew, and we know that the clock is _at least
  1734. as skewed_ as some value, but we don't know the actual value,
  1735. report the value as a "minimum skew."
  1736. o Controller bugfixes:
  1737. - Generate "STATUS_SERVER" events rather than misspelled
  1738. "STATUS_SEVER" events. Caught by mwenge.
  1739. - Reject controller commands over 1MB in length, so rogue
  1740. processes can't run us out of memory.
  1741. - Change the behavior of "getinfo status/good-server-descriptor"
  1742. so it doesn't return failure when any authority disappears.
  1743. - Send NAMESERVER_STATUS messages for a single failed nameserver
  1744. correctly.
  1745. - When the DANGEROUS_VERSION controller status event told us we're
  1746. running an obsolete version, it used the string "OLD" to describe
  1747. it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
  1748. "OBSOLETE" in both cases.
  1749. - Respond to INT and TERM SIGNAL commands before we execute the
  1750. signal, in case the signal shuts us down. We had a patch in
  1751. 0.1.2.1-alpha that tried to do this by queueing the response on
  1752. the connection's buffer before shutting down, but that really
  1753. isn't the same thing at all. Bug located by Matt Edman.
  1754. - Provide DNS expiry times in GMT, not in local time. For backward
  1755. compatibility, ADDRMAP events only provide GMT expiry in an extended
  1756. field. "GETINFO address-mappings" always does the right thing.
  1757. - Use CRLF line endings properly in NS events.
  1758. - Make 'getinfo fingerprint' return a 551 error if we're not a
  1759. server, so we match what the control spec claims we do. Reported
  1760. by daejees.
  1761. - Fix a typo in an error message when extendcircuit fails that
  1762. caused us to not follow the \r\n-based delimiter protocol. Reported
  1763. by daejees.
  1764. - When tunneling an encrypted directory connection, and its first
  1765. circuit fails, do not leave it unattached and ask the controller
  1766. to deal. Fixes the second part of bug 681.
  1767. - Treat some 403 responses from directory servers as INFO rather than
  1768. WARN-severity events.
  1769. o Portability / building / compiling:
  1770. - When building with --enable-gcc-warnings, check for whether Apple's
  1771. warning "-Wshorten-64-to-32" is available.
  1772. - Support compilation to target iPhone; patch from cjacker huang.
  1773. To build for iPhone, pass the --enable-iphone option to configure.
  1774. - Detect non-ASCII platforms (if any still exist) and refuse to
  1775. build there: some of our code assumes that 'A' is 65 and so on.
  1776. - Clear up some MIPSPro compiler warnings.
  1777. - Make autoconf search for libevent, openssl, and zlib consistently.
  1778. - Update deprecated macros in configure.in.
  1779. - When warning about missing headers, tell the user to let us
  1780. know if the compile succeeds anyway, so we can downgrade the
  1781. warning.
  1782. - Include the current subversion revision as part of the version
  1783. string: either fetch it directly if we're in an SVN checkout, do
  1784. some magic to guess it if we're in an SVK checkout, or use
  1785. the last-detected version if we're building from a .tar.gz.
  1786. Use this version consistently in log messages.
  1787. - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
  1788. - Read resolv.conf files correctly on platforms where read() returns
  1789. partial results on small file reads.
  1790. - Build without verbose warnings even on gcc 4.2 and 4.3.
  1791. - On Windows, correctly detect errors when listing the contents of
  1792. a directory. Fix from lodger.
  1793. - Run 'make test' as part of 'make dist', so we stop releasing so
  1794. many development snapshots that fail their unit tests.
  1795. - Add support to detect Libevent versions in the 1.4.x series
  1796. on mingw.
  1797. - Add command-line arguments to unit-test executable so that we can
  1798. invoke any chosen test from the command line rather than having
  1799. to run the whole test suite at once; and so that we can turn on
  1800. logging for the unit tests.
  1801. - Do not automatically run configure from autogen.sh. This
  1802. non-standard behavior tended to annoy people who have built other
  1803. programs.
  1804. - Fix a macro/CPP interaction that was confusing some compilers:
  1805. some GCCs don't like #if/#endif pairs inside macro arguments.
  1806. Fixes bug 707.
  1807. - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
  1808. Fixes bug 704; fix from Steven Murdoch.
  1809. - Correctly detect transparent proxy support on Linux hosts that
  1810. require in.h to be included before netfilter_ipv4.h. Patch
  1811. from coderman.
  1812. o Logging improvements:
  1813. - When we haven't had any application requests lately, don't bother
  1814. logging that we have expired a bunch of descriptors.
  1815. - When attempting to open a logfile fails, tell us why.
  1816. - Only log guard node status when guard node status has changed.
  1817. - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
  1818. make "INFO" 75% less verbose.
  1819. - When SafeLogging is disabled, log addresses along with all TLS
  1820. errors.
  1821. - Report TLS "zero return" case as a "clean close" and "IO error"
  1822. as a "close". Stop calling closes "unexpected closes": existing
  1823. Tors don't use SSL_close(), so having a connection close without
  1824. the TLS shutdown handshake is hardly unexpected.
  1825. - When we receive a consensus from the future, warn about skew.
  1826. - Make "not enough dir info yet" warnings describe *why* Tor feels
  1827. it doesn't have enough directory info yet.
  1828. - On the USR1 signal, when dmalloc is in use, log the top 10 memory
  1829. consumers. (We already do this on HUP.)
  1830. - Give more descriptive well-formedness errors for out-of-range
  1831. hidden service descriptor/protocol versions.
  1832. - Stop recommending that every server operator send mail to tor-ops.
  1833. Resolves bug 597. Bugfix on 0.1.2.x.
  1834. - Improve skew reporting: try to give the user a better log message
  1835. about how skewed they are, and how much this matters.
  1836. - New --quiet command-line option to suppress the default console log.
  1837. Good in combination with --hash-password.
  1838. - Don't complain that "your server has not managed to confirm that its
  1839. ports are reachable" if we haven't been able to build any circuits
  1840. yet.
  1841. - Detect the reason for failing to mmap a descriptor file we just
  1842. wrote, and give a more useful log message. Fixes bug 533.
  1843. - Always prepend "Bug: " to any log message about a bug.
  1844. - When dumping memory usage, list bytes used in buffer memory
  1845. free-lists.
  1846. - When running with dmalloc, dump more stats on hup and on exit.
  1847. - Put a platform string (e.g. "Linux i686") in the startup log
  1848. message, so when people paste just their logs, we know if it's
  1849. OpenBSD or Windows or what.
  1850. - When logging memory usage, break down memory used in buffers by
  1851. buffer type.
  1852. - When we are reporting the DirServer line we just parsed, we were
  1853. logging the second stanza of the key fingerprint, not the first.
  1854. - Even though Windows is equally happy with / and \ as path separators,
  1855. try to use \ consistently on Windows and / consistently on Unix: it
  1856. makes the log messages nicer.
  1857. - On OSX, stop warning the user that kqueue support in libevent is
  1858. "experimental", since it seems to have worked fine for ages.
  1859. o Contributed scripts and tools:
  1860. - Update linux-tor-prio.sh script to allow QoS based on the uid of
  1861. the Tor process. Patch from Marco Bonetti with tweaks from Mike
  1862. Perry.
  1863. - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
  1864. Unix users an easy way to script their Tor process (e.g. by
  1865. adjusting bandwidth based on the time of the day).
  1866. - In the exitlist script, only consider the most recently published
  1867. server descriptor for each server. Also, when the user requests
  1868. a list of servers that _reject_ connections to a given address,
  1869. explicitly exclude the IPs that also have servers that accept
  1870. connections to that address. Resolves bug 405.
  1871. - Include a new contrib/tor-exit-notice.html file that exit relay
  1872. operators can put on their website to help reduce abuse queries.
  1873. o Newly deprecated features:
  1874. - The status/version/num-versioning and status/version/num-concurring
  1875. GETINFO controller options are no longer useful in the v3 directory
  1876. protocol: treat them as deprecated, and warn when they're used.
  1877. - The RedirectExits config option is now deprecated.
  1878. o Removed features:
  1879. - Drop the old code to choke directory connections when the
  1880. corresponding OR connections got full: thanks to the cell queue
  1881. feature, OR conns don't get full any more.
  1882. - Remove the old "dns worker" server DNS code: it hasn't been default
  1883. since 0.1.2.2-alpha, and all the servers are using the new
  1884. eventdns code.
  1885. - Remove the code to generate the oldest (v1) directory format.
  1886. - Remove support for the old bw_accounting file: we've been storing
  1887. bandwidth accounting information in the state file since
  1888. 0.1.2.5-alpha. This may result in bandwidth accounting errors
  1889. if you try to upgrade from 0.1.1.x or earlier, or if you try to
  1890. downgrade to 0.1.1.x or earlier.
  1891. - Drop support for OpenSSL version 0.9.6. Just about nobody was using
  1892. it, it had no AES, and it hasn't seen any security patches since
  1893. 2004.
  1894. - Stop overloading the circuit_t.onionskin field for both "onionskin
  1895. from a CREATE cell that we are waiting for a cpuworker to be
  1896. assigned" and "onionskin from an EXTEND cell that we are going to
  1897. send to an OR as soon as we are connected". Might help with bug 600.
  1898. - Remove the tor_strpartition() function: its logic was confused,
  1899. and it was only used for one thing that could be implemented far
  1900. more easily.
  1901. - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
  1902. and TorControl.py, as they use the old v0 controller protocol,
  1903. and are obsoleted by TorFlow anyway.
  1904. - Drop support for v1 rendezvous descriptors, since we never used
  1905. them anyway, and the code has probably rotted by now. Based on
  1906. patch from Karsten Loesing.
  1907. - Stop allowing address masks that do not correspond to bit prefixes.
  1908. We have warned about these for a really long time; now it's time
  1909. to reject them. (Patch from croup.)
  1910. - Remove an optimization in the AES counter-mode code that assumed
  1911. that the counter never exceeded 2^68. When the counter can be set
  1912. arbitrarily as an IV (as it is by Karsten's new hidden services
  1913. code), this assumption no longer holds.
  1914. - Disable the SETROUTERPURPOSE controller command: it is now
  1915. obsolete.
  1916. Changes in version 0.1.2.19 - 2008-01-17
  1917. Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
  1918. exit policy a little bit more conservative so it's safer to run an
  1919. exit relay on a home system, and fixes a variety of smaller issues.
  1920. o Security fixes:
  1921. - Exit policies now reject connections that are addressed to a
  1922. relay's public (external) IP address too, unless
  1923. ExitPolicyRejectPrivate is turned off. We do this because too
  1924. many relays are running nearby to services that trust them based
  1925. on network address.
  1926. o Major bugfixes:
  1927. - When the clock jumps forward a lot, do not allow the bandwidth
  1928. buckets to become negative. Fixes bug 544.
  1929. - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
  1930. on every successful resolve. Reported by Mike Perry.
  1931. - Purge old entries from the "rephist" database and the hidden
  1932. service descriptor database even when DirPort is zero.
  1933. - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
  1934. requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
  1935. crashing or mis-answering these requests.
  1936. - When we decide to send a 503 response to a request for servers, do
  1937. not then also send the server descriptors: this defeats the whole
  1938. purpose. Fixes bug 539.
  1939. o Minor bugfixes:
  1940. - Changing the ExitPolicyRejectPrivate setting should cause us to
  1941. rebuild our server descriptor.
  1942. - Fix handling of hex nicknames when answering controller requests for
  1943. networkstatus by name, or when deciding whether to warn about
  1944. unknown routers in a config option. (Patch from mwenge.)
  1945. - Fix a couple of hard-to-trigger autoconf problems that could result
  1946. in really weird results on platforms whose sys/types.h files define
  1947. nonstandard integer types.
  1948. - Don't try to create the datadir when running --verify-config or
  1949. --hash-password. Resolves bug 540.
  1950. - If we were having problems getting a particular descriptor from the
  1951. directory caches, and then we learned about a new descriptor for
  1952. that router, we weren't resetting our failure count. Reported
  1953. by lodger.
  1954. - Although we fixed bug 539 (where servers would send HTTP status 503
  1955. responses _and_ send a body too), there are still servers out there
  1956. that haven't upgraded. Therefore, make clients parse such bodies
  1957. when they receive them.
  1958. - Run correctly on systems where rlim_t is larger than unsigned long.
  1959. This includes some 64-bit systems.
  1960. - Run correctly on platforms (like some versions of OS X 10.5) where
  1961. the real limit for number of open files is OPEN_FILES, not rlim_max
  1962. from getrlimit(RLIMIT_NOFILES).
  1963. - Avoid a spurious free on base64 failure.
  1964. - Avoid segfaults on certain complex invocations of
  1965. router_get_by_hexdigest().
  1966. - Fix rare bug on REDIRECTSTREAM control command when called with no
  1967. port set: it could erroneously report an error when none had
  1968. happened.
  1969. Changes in version 0.1.2.18 - 2007-10-28
  1970. Tor 0.1.2.18 fixes many problems including crash bugs, problems with
  1971. hidden service introduction that were causing huge delays, and a big
  1972. bug that was causing some servers to disappear from the network status
  1973. lists for a few hours each day.
  1974. o Major bugfixes (crashes):
  1975. - If a connection is shut down abruptly because of something that
  1976. happened inside connection_flushed_some(), do not call
  1977. connection_finished_flushing(). Should fix bug 451:
  1978. "connection_stop_writing: Assertion conn->write_event failed"
  1979. Bugfix on 0.1.2.7-alpha.
  1980. - Fix possible segfaults in functions called from
  1981. rend_process_relay_cell().
  1982. o Major bugfixes (hidden services):
  1983. - Hidden services were choosing introduction points uniquely by
  1984. hexdigest, but when constructing the hidden service descriptor
  1985. they merely wrote the (potentially ambiguous) nickname.
  1986. - Clients now use the v2 intro format for hidden service
  1987. connections: they specify their chosen rendezvous point by identity
  1988. digest rather than by (potentially ambiguous) nickname. These
  1989. changes could speed up hidden service connections dramatically.
  1990. o Major bugfixes (other):
  1991. - Stop publishing a new server descriptor just because we get a
  1992. HUP signal. This led (in a roundabout way) to some servers getting
  1993. dropped from the networkstatus lists for a few hours each day.
  1994. - When looking for a circuit to cannibalize, consider family as well
  1995. as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
  1996. circuit cannibalization).
  1997. - When a router wasn't listed in a new networkstatus, we were leaving
  1998. the flags for that router alone -- meaning it remained Named,
  1999. Running, etc -- even though absence from the networkstatus means
  2000. that it shouldn't be considered to exist at all anymore. Now we
  2001. clear all the flags for routers that fall out of the networkstatus
  2002. consensus. Fixes bug 529.
  2003. o Minor bugfixes:
  2004. - Don't try to access (or alter) the state file when running
  2005. --list-fingerprint or --verify-config or --hash-password. Resolves
  2006. bug 499.
  2007. - When generating information telling us how to extend to a given
  2008. router, do not try to include the nickname if it is
  2009. absent. Resolves bug 467.
  2010. - Fix a user-triggerable segfault in expand_filename(). (There isn't
  2011. a way to trigger this remotely.)
  2012. - When sending a status event to the controller telling it that an
  2013. OR address is reachable, set the port correctly. (Previously we
  2014. were reporting the dir port.)
  2015. - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
  2016. command. Bugfix on 0.1.2.17.
  2017. - When loading bandwidth history, do not believe any information in
  2018. the future. Fixes bug 434.
  2019. - When loading entry guard information, do not believe any information
  2020. in the future.
  2021. - When we have our clock set far in the future and generate an
  2022. onion key, then re-set our clock to be correct, we should not stop
  2023. the onion key from getting rotated.
  2024. - On some platforms, accept() can return a broken address. Detect
  2025. this more quietly, and deal accordingly. Fixes bug 483.
  2026. - It's not actually an error to find a non-pending entry in the DNS
  2027. cache when canceling a pending resolve. Don't log unless stuff
  2028. is fishy. Resolves bug 463.
  2029. - Don't reset trusted dir server list when we set a configuration
  2030. option. Patch from Robert Hogan.
  2031. Changes in version 0.1.2.17 - 2007-08-30
  2032. Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
  2033. X bundles. Vidalia 0.0.14 makes authentication required for the
  2034. ControlPort in the default configuration, which addresses important
  2035. security risks. Everybody who uses Vidalia (or another controller)
  2036. should upgrade.
  2037. In addition, this Tor update fixes major load balancing problems with
  2038. path selection, which should speed things up a lot once many people
  2039. have upgraded.
  2040. o Major bugfixes (security):
  2041. - We removed support for the old (v0) control protocol. It has been
  2042. deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
  2043. become more of a headache than it's worth.
  2044. o Major bugfixes (load balancing):
  2045. - When choosing nodes for non-guard positions, weight guards
  2046. proportionally less, since they already have enough load. Patch
  2047. from Mike Perry.
  2048. - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
  2049. will allow fast Tor servers to get more attention.
  2050. - When we're upgrading from an old Tor version, forget our current
  2051. guards and pick new ones according to the new weightings. These
  2052. three load balancing patches could raise effective network capacity
  2053. by a factor of four. Thanks to Mike Perry for measurements.
  2054. o Major bugfixes (stream expiration):
  2055. - Expire not-yet-successful application streams in all cases if
  2056. they've been around longer than SocksTimeout. Right now there are
  2057. some cases where the stream will live forever, demanding a new
  2058. circuit every 15 seconds. Fixes bug 454; reported by lodger.
  2059. o Minor features (controller):
  2060. - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
  2061. is valid before any authentication has been received. It tells
  2062. a controller what kind of authentication is expected, and what
  2063. protocol is spoken. Implements proposal 119.
  2064. o Minor bugfixes (performance):
  2065. - Save on most routerlist_assert_ok() calls in routerlist.c, thus
  2066. greatly speeding up loading cached-routers from disk on startup.
  2067. - Disable sentinel-based debugging for buffer code: we squashed all
  2068. the bugs that this was supposed to detect a long time ago, and now
  2069. its only effect is to change our buffer sizes from nice powers of
  2070. two (which platform mallocs tend to like) to values slightly over
  2071. powers of two (which make some platform mallocs sad).
  2072. o Minor bugfixes (misc):
  2073. - If exit bandwidth ever exceeds one third of total bandwidth, then
  2074. use the correct formula to weight exit nodes when choosing paths.
  2075. Based on patch from Mike Perry.
  2076. - Choose perfectly fairly among routers when choosing by bandwidth and
  2077. weighting by fraction of bandwidth provided by exits. Previously, we
  2078. would choose with only approximate fairness, and correct ourselves
  2079. if we ran off the end of the list.
  2080. - If we require CookieAuthentication but we fail to write the
  2081. cookie file, we would warn but not exit, and end up in a state
  2082. where no controller could authenticate. Now we exit.
  2083. - If we require CookieAuthentication, stop generating a new cookie
  2084. every time we change any piece of our config.
  2085. - Refuse to start with certain directory authority keys, and
  2086. encourage people using them to stop.
  2087. - Terminate multi-line control events properly. Original patch
  2088. from tup.
  2089. - Fix a minor memory leak when we fail to find enough suitable
  2090. servers to choose a circuit.
  2091. - Stop leaking part of the descriptor when we run into a particularly
  2092. unparseable piece of it.
  2093. Changes in version 0.1.2.16 - 2007-08-01
  2094. Tor 0.1.2.16 fixes a critical security vulnerability that allows a
  2095. remote attacker in certain situations to rewrite the user's torrc
  2096. configuration file. This can completely compromise anonymity of users
  2097. in most configurations, including those running the Vidalia bundles,
  2098. TorK, etc. Or worse.
  2099. o Major security fixes:
  2100. - Close immediately after missing authentication on control port;
  2101. do not allow multiple authentication attempts.
  2102. Changes in version 0.1.2.15 - 2007-07-17
  2103. Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
  2104. problems, fixes compilation on BSD, and fixes a variety of other
  2105. bugs. Everybody should upgrade.
  2106. o Major bugfixes (compilation):
  2107. - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
  2108. o Major bugfixes (crashes):
  2109. - Try even harder not to dereference the first character after
  2110. an mmap(). Reported by lodger.
  2111. - Fix a crash bug in directory authorities when we re-number the
  2112. routerlist while inserting a new router.
  2113. - When the cached-routers file is an even multiple of the page size,
  2114. don't run off the end and crash. (Fixes bug 455; based on idea
  2115. from croup.)
  2116. - Fix eventdns.c behavior on Solaris: It is critical to include
  2117. orconfig.h _before_ sys/types.h, so that we can get the expected
  2118. definition of _FILE_OFFSET_BITS.
  2119. o Major bugfixes (security):
  2120. - Fix a possible buffer overrun when using BSD natd support. Bug
  2121. found by croup.
  2122. - When sending destroy cells from a circuit's origin, don't include
  2123. the reason for tearing down the circuit. The spec says we didn't,
  2124. and now we actually don't. Reported by lodger.
  2125. - Keep streamids from different exits on a circuit separate. This
  2126. bug may have allowed other routers on a given circuit to inject
  2127. cells into streams. Reported by lodger; fixes bug 446.
  2128. - If there's a never-before-connected-to guard node in our list,
  2129. never choose any guards past it. This way we don't expand our
  2130. guard list unless we need to.
  2131. o Minor bugfixes (guard nodes):
  2132. - Weight guard selection by bandwidth, so that low-bandwidth nodes
  2133. don't get overused as guards.
  2134. o Minor bugfixes (directory):
  2135. - Correctly count the number of authorities that recommend each
  2136. version. Previously, we were under-counting by 1.
  2137. - Fix a potential crash bug when we load many server descriptors at
  2138. once and some of them make others of them obsolete. Fixes bug 458.
  2139. o Minor bugfixes (hidden services):
  2140. - Stop tearing down the whole circuit when the user asks for a
  2141. connection to a port that the hidden service didn't configure.
  2142. Resolves bug 444.
  2143. o Minor bugfixes (misc):
  2144. - On Windows, we were preventing other processes from reading
  2145. cached-routers while Tor was running. Reported by janbar.
  2146. - Fix a possible (but very unlikely) bug in picking routers by
  2147. bandwidth. Add a log message to confirm that it is in fact
  2148. unlikely. Patch from lodger.
  2149. - Backport a couple of memory leak fixes.
  2150. - Backport miscellaneous cosmetic bugfixes.
  2151. Changes in version 0.1.2.14 - 2007-05-25
  2152. Tor 0.1.2.14 changes the addresses of two directory authorities (this
  2153. change especially affects those who serve or use hidden services),
  2154. and fixes several other crash- and security-related bugs.
  2155. o Directory authority changes:
  2156. - Two directory authorities (moria1 and moria2) just moved to new
  2157. IP addresses. This change will particularly affect those who serve
  2158. or use hidden services.
  2159. o Major bugfixes (crashes):
  2160. - If a directory server runs out of space in the connection table
  2161. as it's processing a begin_dir request, it will free the exit stream
  2162. but leave it attached to the circuit, leading to unpredictable
  2163. behavior. (Reported by seeess, fixes bug 425.)
  2164. - Fix a bug in dirserv_remove_invalid() that would cause authorities
  2165. to corrupt memory under some really unlikely scenarios.
  2166. - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
  2167. - Avoid segfaults when reading from mmaped descriptor file. (Reported
  2168. by lodger.)
  2169. o Major bugfixes (security):
  2170. - When choosing an entry guard for a circuit, avoid using guards
  2171. that are in the same family as the chosen exit -- not just guards
  2172. that are exactly the chosen exit. (Reported by lodger.)
  2173. o Major bugfixes (resource management):
  2174. - If a directory authority is down, skip it when deciding where to get
  2175. networkstatus objects or descriptors. Otherwise we keep asking
  2176. every 10 seconds forever. Fixes bug 384.
  2177. - Count it as a failure if we fetch a valid network-status but we
  2178. don't want to keep it. Otherwise we'll keep fetching it and keep
  2179. not wanting to keep it. Fixes part of bug 422.
  2180. - If all of our dirservers have given us bad or no networkstatuses
  2181. lately, then stop hammering them once per minute even when we
  2182. think they're failed. Fixes another part of bug 422.
  2183. o Minor bugfixes:
  2184. - Actually set the purpose correctly for descriptors inserted with
  2185. purpose=controller.
  2186. - When we have k non-v2 authorities in our DirServer config,
  2187. we ignored the last k authorities in the list when updating our
  2188. network-statuses.
  2189. - Correctly back-off from requesting router descriptors that we are
  2190. having a hard time downloading.
  2191. - Read resolv.conf files correctly on platforms where read() returns
  2192. partial results on small file reads.
  2193. - Don't rebuild the entire router store every time we get 32K of
  2194. routers: rebuild it when the journal gets very large, or when
  2195. the gaps in the store get very large.
  2196. o Minor features:
  2197. - When routers publish SVN revisions in their router descriptors,
  2198. authorities now include those versions correctly in networkstatus
  2199. documents.
  2200. - Warn when using a version of libevent before 1.3b to run a server on
  2201. OSX or BSD: these versions interact badly with userspace threads.
  2202. Changes in version 0.1.2.13 - 2007-04-24
  2203. This release features some major anonymity fixes, such as safer path
  2204. selection; better client performance; faster bootstrapping, better
  2205. address detection, and better DNS support for servers; write limiting as
  2206. well as read limiting to make servers easier to run; and a huge pile of
  2207. other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
  2208. Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
  2209. of the Freenode IRC network, remembering his patience and vision for
  2210. free speech on the Internet.
  2211. o Major features, client performance:
  2212. - Weight directory requests by advertised bandwidth. Now we can
  2213. let servers enable write limiting but still allow most clients to
  2214. succeed at their directory requests. (We still ignore weights when
  2215. choosing a directory authority; I hope this is a feature.)
  2216. - Stop overloading exit nodes -- avoid choosing them for entry or
  2217. middle hops when the total bandwidth available from non-exit nodes
  2218. is much higher than the total bandwidth available from exit nodes.
  2219. - Rather than waiting a fixed amount of time between retrying
  2220. application connections, we wait only 10 seconds for the first,
  2221. 10 seconds for the second, and 15 seconds for each retry after
  2222. that. Hopefully this will improve the expected user experience.
  2223. - Sometimes we didn't bother sending a RELAY_END cell when an attempt
  2224. to open a stream fails; now we do in more cases. This should
  2225. make clients able to find a good exit faster in some cases, since
  2226. unhandleable requests will now get an error rather than timing out.
  2227. o Major features, client functionality:
  2228. - Implement BEGIN_DIR cells, so we can connect to a directory
  2229. server via TLS to do encrypted directory requests rather than
  2230. plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
  2231. config options if you like. For now, this feature only works if
  2232. you already have a descriptor for the destination dirserver.
  2233. - Add support for transparent application connections: this basically
  2234. bundles the functionality of trans-proxy-tor into the Tor
  2235. mainline. Now hosts with compliant pf/netfilter implementations
  2236. can redirect TCP connections straight to Tor without diverting
  2237. through SOCKS. (Based on patch from tup.)
  2238. - Add support for using natd; this allows FreeBSDs earlier than
  2239. 5.1.2 to have ipfw send connections through Tor without using
  2240. SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
  2241. o Major features, servers:
  2242. - Setting up a dyndns name for your server is now optional: servers
  2243. with no hostname or IP address will learn their IP address by
  2244. asking the directory authorities. This code only kicks in when you
  2245. would normally have exited with a "no address" error. Nothing's
  2246. authenticated, so use with care.
  2247. - Directory servers now spool server descriptors, v1 directories,
  2248. and v2 networkstatus objects to buffers as needed rather than en
  2249. masse. They also mmap the cached-routers files. These steps save
  2250. lots of memory.
  2251. - Stop requiring clients to have well-formed certificates, and stop
  2252. checking nicknames in certificates. (Clients have certificates so
  2253. that they can look like Tor servers, but in the future we might want
  2254. to allow them to look like regular TLS clients instead. Nicknames
  2255. in certificates serve no purpose other than making our protocol
  2256. easier to recognize on the wire.) Implements proposal 106.
  2257. o Improvements on DNS support:
  2258. - Add "eventdns" asynchronous dns library originally based on code
  2259. from Adam Langley. Now we can discard the old rickety dnsworker
  2260. concept, and support a wider variety of DNS functions. Allows
  2261. multithreaded builds on NetBSD and OpenBSD again.
  2262. - Add server-side support for "reverse" DNS lookups (using PTR
  2263. records so clients can determine the canonical hostname for a given
  2264. IPv4 address). Only supported by servers using eventdns; servers
  2265. now announce in their descriptors if they don't support eventdns.
  2266. - Workaround for name servers (like Earthlink's) that hijack failing
  2267. DNS requests and replace the no-such-server answer with a "helpful"
  2268. redirect to an advertising-driven search portal. Also work around
  2269. DNS hijackers who "helpfully" decline to hijack known-invalid
  2270. RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
  2271. lets you turn it off.
  2272. - Servers now check for the case when common DNS requests are going to
  2273. wildcarded addresses (i.e. all getting the same answer), and change
  2274. their exit policy to reject *:* if it's happening.
  2275. - When asked to resolve a hostname, don't use non-exit servers unless
  2276. requested to do so. This allows servers with broken DNS to be
  2277. useful to the network.
  2278. - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
  2279. useless IPv6 DNS resolves.
  2280. - Specify and implement client-side SOCKS5 interface for reverse DNS
  2281. lookups (see doc/socks-extensions.txt). Also cache them.
  2282. - When we change nameservers or IP addresses, reset and re-launch
  2283. our tests for DNS hijacking.
  2284. o Improvements on reachability testing:
  2285. - Servers send out a burst of long-range padding cells once they've
  2286. established that they're reachable. Spread them over 4 circuits,
  2287. so hopefully a few will be fast. This exercises bandwidth and
  2288. bootstraps them into the directory more quickly.
  2289. - When we find our DirPort to be reachable, publish a new descriptor
  2290. so we'll tell the world (reported by pnx).
  2291. - Directory authorities now only decide that routers are reachable
  2292. if their identity keys are as expected.
  2293. - Do DirPort reachability tests less often, since a single test
  2294. chews through many circuits before giving up.
  2295. - Avoid some false positives during reachability testing: don't try
  2296. to test via a server that's on the same /24 network as us.
  2297. - Start publishing one minute or so after we find our ORPort
  2298. to be reachable. This will help reduce the number of descriptors
  2299. we have for ourselves floating around, since it's quite likely
  2300. other things (e.g. DirPort) will change during that minute too.
  2301. - Routers no longer try to rebuild long-term connections to directory
  2302. authorities, and directory authorities no longer try to rebuild
  2303. long-term connections to all servers. We still don't hang up
  2304. connections in these two cases though -- we need to look at it
  2305. more carefully to avoid flapping, and we likely need to wait til
  2306. 0.1.1.x is obsolete.
  2307. o Improvements on rate limiting:
  2308. - Enable write limiting as well as read limiting. Now we sacrifice
  2309. capacity if we're pushing out lots of directory traffic, rather
  2310. than overrunning the user's intended bandwidth limits.
  2311. - Include TLS overhead when counting bandwidth usage; previously, we
  2312. would count only the bytes sent over TLS, but not the bytes used
  2313. to send them.
  2314. - Servers decline directory requests much more aggressively when
  2315. they're low on bandwidth. Otherwise they end up queueing more and
  2316. more directory responses, which can't be good for latency.
  2317. - But never refuse directory requests from local addresses.
  2318. - Be willing to read or write on local connections (e.g. controller
  2319. connections) even when the global rate limiting buckets are empty.
  2320. - Flush local controller connection buffers periodically as we're
  2321. writing to them, so we avoid queueing 4+ megabytes of data before
  2322. trying to flush.
  2323. - Revise and clean up the torrc.sample that we ship with; add
  2324. a section for BandwidthRate and BandwidthBurst.
  2325. o Major features, NT services:
  2326. - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
  2327. command-line flag so that admins can override the default by saying
  2328. "tor --service install --user "SomeUser"". This will not affect
  2329. existing installed services. Also, warn the user that the service
  2330. will look for its configuration file in the service user's
  2331. %appdata% directory. (We can't do the "hardwire the user's appdata
  2332. directory" trick any more, since we may not have read access to that
  2333. directory.)
  2334. - Support running the Tor service with a torrc not in the same
  2335. directory as tor.exe and default to using the torrc located in
  2336. the %appdata%\Tor\ of the user who installed the service. Patch
  2337. from Matt Edman.
  2338. - Add an --ignore-missing-torrc command-line option so that we can
  2339. get the "use sensible defaults if the configuration file doesn't
  2340. exist" behavior even when specifying a torrc location on the
  2341. command line.
  2342. - When stopping an NT service, wait up to 10 sec for it to actually
  2343. stop. (Patch from Matt Edman; resolves bug 295.)
  2344. o Directory authority improvements:
  2345. - Stop letting hibernating or obsolete servers affect uptime and
  2346. bandwidth cutoffs.
  2347. - Stop listing hibernating servers in the v1 directory.
  2348. - Authorities no longer recommend exits as guards if this would shift
  2349. too much load to the exit nodes.
  2350. - Authorities now specify server versions in networkstatus. This adds
  2351. about 2% to the size of compressed networkstatus docs, and allows
  2352. clients to tell which servers support BEGIN_DIR and which don't.
  2353. The implementation is forward-compatible with a proposed future
  2354. protocol version scheme not tied to Tor versions.
  2355. - DirServer configuration lines now have an orport= option so
  2356. clients can open encrypted tunnels to the authorities without
  2357. having downloaded their descriptors yet. Enabled for moria1,
  2358. moria2, tor26, and lefkada now in the default configuration.
  2359. - Add a BadDirectory flag to network status docs so that authorities
  2360. can (eventually) tell clients about caches they believe to be
  2361. broken. Not used yet.
  2362. - Allow authorities to list nodes as bad exits in their
  2363. approved-routers file by fingerprint or by address. If most
  2364. authorities set a BadExit flag for a server, clients don't think
  2365. of it as a general-purpose exit. Clients only consider authorities
  2366. that advertise themselves as listing bad exits.
  2367. - Patch from Steve Hildrey: Generate network status correctly on
  2368. non-versioning dirservers.
  2369. - Have directory authorities allow larger amounts of drift in uptime
  2370. without replacing the server descriptor: previously, a server that
  2371. restarted every 30 minutes could have 48 "interesting" descriptors
  2372. per day.
  2373. - Reserve the nickname "Unnamed" for routers that can't pick
  2374. a hostname: any router can call itself Unnamed; directory
  2375. authorities will never allocate Unnamed to any particular router;
  2376. clients won't believe that any router is the canonical Unnamed.
  2377. o Directory mirrors and clients:
  2378. - Discard any v1 directory info that's over 1 month old (for
  2379. directories) or over 1 week old (for running-routers lists).
  2380. - Clients track responses with status 503 from dirservers. After a
  2381. dirserver has given us a 503, we try not to use it until an hour has
  2382. gone by, or until we have no dirservers that haven't given us a 503.
  2383. - When we get a 503 from a directory, and we're not a server, we no
  2384. longer count the failure against the total number of failures
  2385. allowed for the object we're trying to download.
  2386. - Prepare for servers to publish descriptors less often: never
  2387. discard a descriptor simply for being too old until either it is
  2388. recommended by no authorities, or until we get a better one for
  2389. the same router. Make caches consider retaining old recommended
  2390. routers for even longer.
  2391. - Directory servers now provide 'Pragma: no-cache' and 'Expires'
  2392. headers for content, so that we can work better in the presence of
  2393. caching HTTP proxies.
  2394. - Stop fetching descriptors if you're not a dir mirror and you
  2395. haven't tried to establish any circuits lately. (This currently
  2396. causes some dangerous behavior, because when you start up again
  2397. you'll use your ancient server descriptors.)
  2398. o Major fixes, crashes:
  2399. - Stop crashing when the controller asks us to resetconf more than
  2400. one config option at once. (Vidalia 0.0.11 does this.)
  2401. - Fix a longstanding obscure crash bug that could occur when we run
  2402. out of DNS worker processes, if we're not using eventdns. (Resolves
  2403. bug 390.)
  2404. - Fix an assert that could trigger if a controller quickly set then
  2405. cleared EntryNodes. (Bug found by Udo van den Heuvel.)
  2406. - Avoid crash when telling controller about stream-status and a
  2407. stream is detached.
  2408. - Avoid sending junk to controllers or segfaulting when a controller
  2409. uses EVENT_NEW_DESC with verbose nicknames.
  2410. - Stop triggering asserts if the controller tries to extend hidden
  2411. service circuits (reported by mwenge).
  2412. - If we start a server with ClientOnly 1, then set ClientOnly to 0
  2413. and hup, stop triggering an assert based on an empty onion_key.
  2414. - Mask out all signals in sub-threads; only the libevent signal
  2415. handler should be processing them. This should prevent some crashes
  2416. on some machines using pthreads. (Patch from coderman.)
  2417. - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
  2418. o Major fixes, anonymity/security:
  2419. - Automatically avoid picking more than one node from the same
  2420. /16 network when constructing a circuit. Add an
  2421. "EnforceDistinctSubnets" option to let people disable it if they
  2422. want to operate private test networks on a single subnet.
  2423. - When generating bandwidth history, round down to the nearest
  2424. 1k. When storing accounting data, round up to the nearest 1k.
  2425. - When we're running as a server, remember when we last rotated onion
  2426. keys, so that we will rotate keys once they're a week old even if
  2427. we never stay up for a week ourselves.
  2428. - If a client asked for a server by name, and there's a named server
  2429. in our network-status but we don't have its descriptor yet, we
  2430. could return an unnamed server instead.
  2431. - Reject (most) attempts to use Tor circuits with length one. (If
  2432. many people start using Tor as a one-hop proxy, exit nodes become
  2433. a more attractive target for compromise.)
  2434. - Just because your DirPort is open doesn't mean people should be
  2435. able to remotely teach you about hidden service descriptors. Now
  2436. only accept rendezvous posts if you've got HSAuthoritativeDir set.
  2437. - Fix a potential race condition in the rpm installer. Found by
  2438. Stefan Nordhausen.
  2439. - Do not log IPs with TLS failures for incoming TLS
  2440. connections. (Fixes bug 382.)
  2441. o Major fixes, other:
  2442. - If our system clock jumps back in time, don't publish a negative
  2443. uptime in the descriptor.
  2444. - When we start during an accounting interval before it's time to wake
  2445. up, remember to wake up at the correct time. (May fix bug 342.)
  2446. - Previously, we would cache up to 16 old networkstatus documents
  2447. indefinitely, if they came from nontrusted authorities. Now we
  2448. discard them if they are more than 10 days old.
  2449. - When we have a state file we cannot parse, tell the user and
  2450. move it aside. Now we avoid situations where the user starts
  2451. Tor in 1904, Tor writes a state file with that timestamp in it,
  2452. the user fixes her clock, and Tor refuses to start.
  2453. - Publish a new descriptor after we hup/reload. This is important
  2454. if our config has changed such that we'll want to start advertising
  2455. our DirPort now, etc.
  2456. - If we are using an exit enclave and we can't connect, e.g. because
  2457. its webserver is misconfigured to not listen on localhost, then
  2458. back off and try connecting from somewhere else before we fail.
  2459. o New config options or behaviors:
  2460. - When EntryNodes are configured, rebuild the guard list to contain,
  2461. in order: the EntryNodes that were guards before; the rest of the
  2462. EntryNodes; the nodes that were guards before.
  2463. - Do not warn when individual nodes in the configuration's EntryNodes,
  2464. ExitNodes, etc are down: warn only when all possible nodes
  2465. are down. (Fixes bug 348.)
  2466. - Put a lower-bound on MaxAdvertisedBandwidth.
  2467. - Start using the state file to store bandwidth accounting data:
  2468. the bw_accounting file is now obsolete. We'll keep generating it
  2469. for a while for people who are still using 0.1.2.4-alpha.
  2470. - Try to batch changes to the state file so that we do as few
  2471. disk writes as possible while still storing important things in
  2472. a timely fashion.
  2473. - The state file and the bw_accounting file get saved less often when
  2474. the AvoidDiskWrites config option is set.
  2475. - Make PIDFile work on Windows.
  2476. - Add internal descriptions for a bunch of configuration options:
  2477. accessible via controller interface and in comments in saved
  2478. options files.
  2479. - Reject *:563 (NNTPS) in the default exit policy. We already reject
  2480. NNTP by default, so this seems like a sensible addition.
  2481. - Clients now reject hostnames with invalid characters. This should
  2482. avoid some inadvertent info leaks. Add an option
  2483. AllowNonRFC953Hostnames to disable this behavior, in case somebody
  2484. is running a private network with hosts called @, !, and #.
  2485. - Check for addresses with invalid characters at the exit as well,
  2486. and warn less verbosely when they fail. You can override this by
  2487. setting ServerDNSAllowNonRFC953Addresses to 1.
  2488. - Remove some options that have been deprecated since at least
  2489. 0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
  2490. SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
  2491. to set log options. Mark PathlenCoinWeight as obsolete.
  2492. - Stop accepting certain malformed ports in configured exit policies.
  2493. - When the user uses bad syntax in the Log config line, stop
  2494. suggesting other bad syntax as a replacement.
  2495. - Add new config option "ResolvConf" to let the server operator
  2496. choose an alternate resolve.conf file when using eventdns.
  2497. - If one of our entry guards is on the ExcludeNodes list, or the
  2498. directory authorities don't think it's a good guard, treat it as
  2499. if it were unlisted: stop using it as a guard, and throw it off
  2500. the guards list if it stays that way for a long time.
  2501. - Allow directory authorities to be marked separately as authorities
  2502. for the v1 directory protocol, the v2 directory protocol, and
  2503. as hidden service directories, to make it easier to retire old
  2504. authorities. V1 authorities should set "HSAuthoritativeDir 1"
  2505. to continue being hidden service authorities too.
  2506. - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
  2507. - Make TrackExitHosts case-insensitive, and fix the behavior of
  2508. ".suffix" TrackExitHosts items to avoid matching in the middle of
  2509. an address.
  2510. - New DirPort behavior: if you have your dirport set, you download
  2511. descriptors aggressively like a directory mirror, whether or not
  2512. your ORPort is set.
  2513. o Docs:
  2514. - Create a new file ReleaseNotes which was the old ChangeLog. The
  2515. new ChangeLog file now includes the notes for all development
  2516. versions too.
  2517. - Add a new address-spec.txt document to describe our special-case
  2518. addresses: .exit, .onion, and .noconnnect.
  2519. - Fork the v1 directory protocol into its own spec document,
  2520. and mark dir-spec.txt as the currently correct (v2) spec.
  2521. o Packaging, porting, and contrib
  2522. - "tor --verify-config" now exits with -1(255) or 0 depending on
  2523. whether the config options are bad or good.
  2524. - The Debian package now uses --verify-config when (re)starting,
  2525. to distinguish configuration errors from other errors.
  2526. - Adapt a patch from goodell to let the contrib/exitlist script
  2527. take arguments rather than require direct editing.
  2528. - Prevent the contrib/exitlist script from printing the same
  2529. result more than once.
  2530. - Add support to tor-resolve tool for reverse lookups and SOCKS5.
  2531. - In the hidden service example in torrc.sample, stop recommending
  2532. esoteric and discouraged hidden service options.
  2533. - Patch from Michael Mohr to contrib/cross.sh, so it checks more
  2534. values before failing, and always enables eventdns.
  2535. - Try to detect Windows correctly when cross-compiling.
  2536. - Libevent-1.2 exports, but does not define in its headers, strlcpy.
  2537. Try to fix this in configure.in by checking for most functions
  2538. before we check for libevent.
  2539. - Update RPMs to require libevent 1.2.
  2540. - Experimentally re-enable kqueue on OSX when using libevent 1.1b
  2541. or later. Log when we are doing this, so we can diagnose it when
  2542. it fails. (Also, recommend libevent 1.1b for kqueue and
  2543. win32 methods; deprecate libevent 1.0b harder; make libevent
  2544. recommendation system saner.)
  2545. - Build with recent (1.3+) libevents on platforms that do not
  2546. define the nonstandard types "u_int8_t" and friends.
  2547. - Remove architecture from OS X builds. The official builds are
  2548. now universal binaries.
  2549. - Run correctly on OS X platforms with case-sensitive filesystems.
  2550. - Correctly set maximum connection limit on Cygwin. (This time
  2551. for sure!)
  2552. - Start compiling on MinGW on Windows (patches from Mike Chiussi
  2553. and many others).
  2554. - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
  2555. - Finally fix the openssl warnings from newer gccs that believe that
  2556. ignoring a return value is okay, but casting a return value and
  2557. then ignoring it is a sign of madness.
  2558. - On architectures where sizeof(int)>4, still clamp declarable
  2559. bandwidth to INT32_MAX.
  2560. o Minor features, controller:
  2561. - Warn the user when an application uses the obsolete binary v0
  2562. control protocol. We're planning to remove support for it during
  2563. the next development series, so it's good to give people some
  2564. advance warning.
  2565. - Add STREAM_BW events to report per-entry-stream bandwidth
  2566. use. (Patch from Robert Hogan.)
  2567. - Rate-limit SIGNEWNYM signals in response to controllers that
  2568. impolitely generate them for every single stream. (Patch from
  2569. mwenge; closes bug 394.)
  2570. - Add a REMAP status to stream events to note that a stream's
  2571. address has changed because of a cached address or a MapAddress
  2572. directive.
  2573. - Make REMAP stream events have a SOURCE (cache or exit), and
  2574. make them generated in every case where we get a successful
  2575. connected or resolved cell.
  2576. - Track reasons for OR connection failure; make these reasons
  2577. available via the controller interface. (Patch from Mike Perry.)
  2578. - Add a SOCKS_BAD_HOSTNAME client status event so controllers
  2579. can learn when clients are sending malformed hostnames to Tor.
  2580. - Specify and implement some of the controller status events.
  2581. - Have GETINFO dir/status/* work on hosts with DirPort disabled.
  2582. - Reimplement GETINFO so that info/names stays in sync with the
  2583. actual keys.
  2584. - Implement "GETINFO fingerprint".
  2585. - Implement "SETEVENTS GUARD" so controllers can get updates on
  2586. entry guard status as it changes.
  2587. - Make all connections to addresses of the form ".noconnect"
  2588. immediately get closed. This lets application/controller combos
  2589. successfully test whether they're talking to the same Tor by
  2590. watching for STREAM events.
  2591. - Add a REASON field to CIRC events; for backward compatibility, this
  2592. field is sent only to controllers that have enabled the extended
  2593. event format. Also, add additional reason codes to explain why
  2594. a given circuit has been destroyed or truncated. (Patches from
  2595. Mike Perry)
  2596. - Add a REMOTE_REASON field to extended CIRC events to tell the
  2597. controller why a remote OR told us to close a circuit.
  2598. - Stream events also now have REASON and REMOTE_REASON fields,
  2599. working much like those for circuit events.
  2600. - There's now a GETINFO ns/... field so that controllers can ask Tor
  2601. about the current status of a router.
  2602. - A new event type "NS" to inform a controller when our opinion of
  2603. a router's status has changed.
  2604. - Add a GETINFO events/names and GETINFO features/names so controllers
  2605. can tell which events and features are supported.
  2606. - A new CLEARDNSCACHE signal to allow controllers to clear the
  2607. client-side DNS cache without expiring circuits.
  2608. - Fix CIRC controller events so that controllers can learn the
  2609. identity digests of non-Named servers used in circuit paths.
  2610. - Let controllers ask for more useful identifiers for servers. Instead
  2611. of learning identity digests for un-Named servers and nicknames
  2612. for Named servers, the new identifiers include digest, nickname,
  2613. and indication of Named status. Off by default; see control-spec.txt
  2614. for more information.
  2615. - Add a "getinfo address" controller command so it can display Tor's
  2616. best guess to the user.
  2617. - New controller event to alert the controller when our server
  2618. descriptor has changed.
  2619. - Give more meaningful errors on controller authentication failure.
  2620. - Export the default exit policy via the control port, so controllers
  2621. don't need to guess what it is / will be later.
  2622. o Minor bugfixes, controller:
  2623. - When creating a circuit via the controller, send a 'launched'
  2624. event when we're done, so we follow the spec better.
  2625. - Correct the control spec to match how the code actually responds
  2626. to 'getinfo addr-mappings/*'. Reported by daejees.
  2627. - The control spec described a GUARDS event, but the code
  2628. implemented a GUARD event. Standardize on GUARD, but let people
  2629. ask for GUARDS too. Reported by daejees.
  2630. - Give the controller END_STREAM_REASON_DESTROY events _before_ we
  2631. clear the corresponding on_circuit variable, and remember later
  2632. that we don't need to send a redundant CLOSED event. (Resolves part
  2633. 3 of bug 367.)
  2634. - Report events where a resolve succeeded or where we got a socks
  2635. protocol error correctly, rather than calling both of them
  2636. "INTERNAL".
  2637. - Change reported stream target addresses to IP consistently when
  2638. we finally get the IP from an exit node.
  2639. - Send log messages to the controller even if they happen to be very
  2640. long.
  2641. - Flush ERR-level controller status events just like we currently
  2642. flush ERR-level log events, so that a Tor shutdown doesn't prevent
  2643. the controller from learning about current events.
  2644. - Report the circuit number correctly in STREAM CLOSED events. Bug
  2645. reported by Mike Perry.
  2646. - Do not report bizarre values for results of accounting GETINFOs
  2647. when the last second's write or read exceeds the allotted bandwidth.
  2648. - Report "unrecognized key" rather than an empty string when the
  2649. controller tries to fetch a networkstatus that doesn't exist.
  2650. - When the controller does a "GETINFO network-status", tell it
  2651. about even those routers whose descriptors are very old, and use
  2652. long nicknames where appropriate.
  2653. - Fix handling of verbose nicknames with ORCONN controller events:
  2654. make them show up exactly when requested, rather than exactly when
  2655. not requested.
  2656. - Controller signals now work on non-Unix platforms that don't define
  2657. SIGUSR1 and SIGUSR2 the way we expect.
  2658. - Respond to SIGNAL command before we execute the signal, in case
  2659. the signal shuts us down. Suggested by Karsten Loesing.
  2660. - Handle reporting OR_CONN_EVENT_NEW events to the controller.
  2661. o Minor features, code performance:
  2662. - Major performance improvement on inserting descriptors: change
  2663. algorithm from O(n^2) to O(n).
  2664. - Do not rotate onion key immediately after setting it for the first
  2665. time.
  2666. - Call router_have_min_dir_info half as often. (This is showing up in
  2667. some profiles, but not others.)
  2668. - When using GCC, make log_debug never get called at all, and its
  2669. arguments never get evaluated, when no debug logs are configured.
  2670. (This is showing up in some profiles, but not others.)
  2671. - Statistics dumped by -USR2 now include a breakdown of public key
  2672. operations, for profiling.
  2673. - Make the common memory allocation path faster on machines where
  2674. malloc(0) returns a pointer.
  2675. - Split circuit_t into origin_circuit_t and or_circuit_t, and
  2676. split connection_t into edge, or, dir, control, and base structs.
  2677. These will save quite a bit of memory on busy servers, and they'll
  2678. also help us track down bugs in the code and bugs in the spec.
  2679. - Use OpenSSL's AES implementation on platforms where it's faster.
  2680. This could save us as much as 10% CPU usage.
  2681. o Minor features, descriptors and descriptor handling:
  2682. - Avoid duplicate entries on MyFamily line in server descriptor.
  2683. - When Tor receives a router descriptor that it asked for, but
  2684. no longer wants (because it has received fresh networkstatuses
  2685. in the meantime), do not warn the user. Cache the descriptor if
  2686. we're a cache; drop it if we aren't.
  2687. - Servers no longer ever list themselves in their "family" line,
  2688. even if configured to do so. This makes it easier to configure
  2689. family lists conveniently.
  2690. o Minor fixes, confusing/misleading log messages:
  2691. - Display correct results when reporting which versions are
  2692. recommended, and how recommended they are. (Resolves bug 383.)
  2693. - Inform the server operator when we decide not to advertise a
  2694. DirPort due to AccountingMax enabled or a low BandwidthRate.
  2695. - Only include function names in log messages for info/debug messages.
  2696. For notice/warn/err, the content of the message should be clear on
  2697. its own, and printing the function name only confuses users.
  2698. - Remove even more protocol-related warnings from Tor server logs,
  2699. such as bad TLS handshakes and malformed begin cells.
  2700. - Fix bug 314: Tor clients issued "unsafe socks" warnings even
  2701. when the IP address is mapped through MapAddress to a hostname.
  2702. - Fix misleading log messages: an entry guard that is "unlisted",
  2703. as well as not known to be "down" (because we've never heard
  2704. of it), is not therefore "up".
  2705. o Minor fixes, old/obsolete behavior:
  2706. - Start assuming we can use a create_fast cell if we don't know
  2707. what version a router is running.
  2708. - We no longer look for identity and onion keys in "identity.key" and
  2709. "onion.key" -- these were replaced by secret_id_key and
  2710. secret_onion_key in 0.0.8pre1.
  2711. - We no longer require unrecognized directory entries to be
  2712. preceded by "opt".
  2713. - Drop compatibility with obsolete Tors that permit create cells
  2714. to have the wrong circ_id_type.
  2715. - Remove code to special-case "-cvs" ending, since it has not
  2716. actually mattered since 0.0.9.
  2717. - Don't re-write the fingerprint file every restart, unless it has
  2718. changed.
  2719. o Minor fixes, misc client-side behavior:
  2720. - Always remove expired routers and networkstatus docs before checking
  2721. whether we have enough information to build circuits. (Fixes
  2722. bug 373.)
  2723. - When computing clock skew from directory HTTP headers, consider what
  2724. time it was when we finished asking for the directory, not what
  2725. time it is now.
  2726. - Make our socks5 handling more robust to broken socks clients:
  2727. throw out everything waiting on the buffer in between socks
  2728. handshake phases, since they can't possibly (so the theory
  2729. goes) have predicted what we plan to respond to them.
  2730. - Expire socks connections if they spend too long waiting for the
  2731. handshake to finish. Previously we would let them sit around for
  2732. days, if the connecting application didn't close them either.
  2733. - And if the socks handshake hasn't started, don't send a
  2734. "DNS resolve socks failed" handshake reply; just close it.
  2735. - If the user asks to use invalid exit nodes, be willing to use
  2736. unstable ones.
  2737. - Track unreachable entry guards correctly: don't conflate
  2738. 'unreachable by us right now' with 'listed as down by the directory
  2739. authorities'. With the old code, if a guard was unreachable by us
  2740. but listed as running, it would clog our guard list forever.
  2741. - Behave correctly in case we ever have a network with more than
  2742. 2GB/s total advertised capacity.
  2743. - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
  2744. - Fix a memory leak when we ask for "all" networkstatuses and we
  2745. get one we don't recognize.
  2746. Changes in version 0.1.1.26 - 2006-12-14
  2747. o Security bugfixes:
  2748. - Stop sending the HttpProxyAuthenticator string to directory
  2749. servers when directory connections are tunnelled through Tor.
  2750. - Clients no longer store bandwidth history in the state file.
  2751. - Do not log introduction points for hidden services if SafeLogging
  2752. is set.
  2753. o Minor bugfixes:
  2754. - Fix an assert failure when a directory authority sets
  2755. AuthDirRejectUnlisted and then receives a descriptor from an
  2756. unlisted router (reported by seeess).
  2757. Changes in version 0.1.1.25 - 2006-11-04
  2758. o Major bugfixes:
  2759. - When a client asks us to resolve (rather than connect to)
  2760. an address, and we have a cached answer, give them the cached
  2761. answer. Previously, we would give them no answer at all.
  2762. - We were building exactly the wrong circuits when we predict
  2763. hidden service requirements, meaning Tor would have to build all
  2764. its circuits on demand.
  2765. - If none of our live entry guards have a high uptime, but we
  2766. require a guard with a high uptime, try adding a new guard before
  2767. we give up on the requirement. This patch should make long-lived
  2768. connections more stable on average.
  2769. - When testing reachability of our DirPort, don't launch new
  2770. tests when there's already one in progress -- unreachable
  2771. servers were stacking up dozens of testing streams.
  2772. o Security bugfixes:
  2773. - When the user sends a NEWNYM signal, clear the client-side DNS
  2774. cache too. Otherwise we continue to act on previous information.
  2775. o Minor bugfixes:
  2776. - Avoid a memory corruption bug when creating a hash table for
  2777. the first time.
  2778. - Avoid possibility of controller-triggered crash when misusing
  2779. certain commands from a v0 controller on platforms that do not
  2780. handle printf("%s",NULL) gracefully.
  2781. - Avoid infinite loop on unexpected controller input.
  2782. - Don't log spurious warnings when we see a circuit close reason we
  2783. don't recognize; it's probably just from a newer version of Tor.
  2784. - Add Vidalia to the OS X uninstaller script, so when we uninstall
  2785. Tor/Privoxy we also uninstall Vidalia.
  2786. Changes in version 0.1.1.24 - 2006-09-29
  2787. o Major bugfixes:
  2788. - Allow really slow clients to not hang up five minutes into their
  2789. directory downloads (suggested by Adam J. Richter).
  2790. - Fix major performance regression from 0.1.0.x: instead of checking
  2791. whether we have enough directory information every time we want to
  2792. do something, only check when the directory information has changed.
  2793. This should improve client CPU usage by 25-50%.
  2794. - Don't crash if, after a server has been running for a while,
  2795. it can't resolve its hostname.
  2796. - When a client asks us to resolve (not connect to) an address,
  2797. and we have a cached answer, give them the cached answer.
  2798. Previously, we would give them no answer at all.
  2799. o Minor bugfixes:
  2800. - Allow Tor to start when RunAsDaemon is set but no logs are set.
  2801. - Don't crash when the controller receives a third argument to an
  2802. "extendcircuit" request.
  2803. - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
  2804. response; fix error code when "getinfo dir/status/" fails.
  2805. - Fix configure.in to not produce broken configure files with
  2806. more recent versions of autoconf. Thanks to Clint for his auto*
  2807. voodoo.
  2808. - Fix security bug on NetBSD that could allow someone to force
  2809. uninitialized RAM to be sent to a server's DNS resolver. This
  2810. only affects NetBSD and other platforms that do not bounds-check
  2811. tolower().
  2812. - Warn user when using libevent 1.1a or earlier with win32 or kqueue
  2813. methods: these are known to be buggy.
  2814. - If we're a directory mirror and we ask for "all" network status
  2815. documents, we would discard status documents from authorities
  2816. we don't recognize.
  2817. Changes in version 0.1.1.23 - 2006-07-30
  2818. o Major bugfixes:
  2819. - Fast Tor servers, especially exit nodes, were triggering asserts
  2820. due to a bug in handling the list of pending DNS resolves. Some
  2821. bugs still remain here; we're hunting them.
  2822. - Entry guards could crash clients by sending unexpected input.
  2823. - More fixes on reachability testing: if you find yourself reachable,
  2824. then don't ever make any client requests (so you stop predicting
  2825. circuits), then hup or have your clock jump, then later your IP
  2826. changes, you won't think circuits are working, so you won't try to
  2827. test reachability, so you won't publish.
  2828. o Minor bugfixes:
  2829. - Avoid a crash if the controller does a resetconf firewallports
  2830. and then a setconf fascistfirewall=1.
  2831. - Avoid an integer underflow when the dir authority decides whether
  2832. a router is stable: we might wrongly label it stable, and compute
  2833. a slightly wrong median stability, when a descriptor is published
  2834. later than now.
  2835. - Fix a place where we might trigger an assert if we can't build our
  2836. own server descriptor yet.
  2837. Changes in version 0.1.1.22 - 2006-07-05
  2838. o Major bugfixes:
  2839. - Fix a big bug that was causing servers to not find themselves
  2840. reachable if they changed IP addresses. Since only 0.1.1.22+
  2841. servers can do reachability testing correctly, now we automatically
  2842. make sure to test via one of these.
  2843. - Fix to allow clients and mirrors to learn directory info from
  2844. descriptor downloads that get cut off partway through.
  2845. - Directory authorities had a bug in deciding if a newly published
  2846. descriptor was novel enough to make everybody want a copy -- a few
  2847. servers seem to be publishing new descriptors many times a minute.
  2848. o Minor bugfixes:
  2849. - Fix a rare bug that was causing some servers to complain about
  2850. "closing wedged cpuworkers" and skip some circuit create requests.
  2851. - Make the Exit flag in directory status documents actually work.
  2852. Changes in version 0.1.1.21 - 2006-06-10
  2853. o Crash and assert fixes from 0.1.1.20:
  2854. - Fix a rare crash on Tor servers that have enabled hibernation.
  2855. - Fix a seg fault on startup for Tor networks that use only one
  2856. directory authority.
  2857. - Fix an assert from a race condition that occurs on Tor servers
  2858. while exiting, where various threads are trying to log that they're
  2859. exiting, and delete the logs, at the same time.
  2860. - Make our unit tests pass again on certain obscure platforms.
  2861. o Other fixes:
  2862. - Add support for building SUSE RPM packages.
  2863. - Speed up initial bootstrapping for clients: if we are making our
  2864. first ever connection to any entry guard, then don't mark it down
  2865. right after that.
  2866. - When only one Tor server in the network is labelled as a guard,
  2867. and we've already picked him, we would cycle endlessly picking him
  2868. again, being unhappy about it, etc. Now we specifically exclude
  2869. current guards when picking a new guard.
  2870. - Servers send create cells more reliably after the TLS connection
  2871. is established: we were sometimes forgetting to send half of them
  2872. when we had more than one pending.
  2873. - If we get a create cell that asks us to extend somewhere, but the
  2874. Tor server there doesn't match the expected digest, we now send
  2875. a destroy cell back, rather than silently doing nothing.
  2876. - Make options->RedirectExit work again.
  2877. - Make cookie authentication for the controller work again.
  2878. - Stop being picky about unusual characters in the arguments to
  2879. mapaddress. It's none of our business.
  2880. - Add a new config option "TestVia" that lets you specify preferred
  2881. middle hops to use for test circuits. Perhaps this will let me
  2882. debug the reachability problems better.
  2883. o Log / documentation fixes:
  2884. - If we're a server and some peer has a broken TLS certificate, don't
  2885. log about it unless ProtocolWarnings is set, i.e., we want to hear
  2886. about protocol violations by others.
  2887. - Fix spelling of VirtualAddrNetwork in man page.
  2888. - Add a better explanation at the top of the autogenerated torrc file
  2889. about what happened to our old torrc.
  2890. Changes in version 0.1.1.20 - 2006-05-23
  2891. o Crash and assert fixes from 0.1.0.17:
  2892. - Fix assert bug in close_logs() on exit: when we close and delete
  2893. logs, remove them all from the global "logfiles" list.
  2894. - Fix an assert error when we're out of space in the connection_list
  2895. and we try to post a hidden service descriptor (reported by Peter
  2896. Palfrader).
  2897. - Fix a rare assert error when we've tried all intro points for
  2898. a hidden service and we try fetching the service descriptor again:
  2899. "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed".
  2900. - Setconf SocksListenAddress kills Tor if it fails to bind. Now back
  2901. out and refuse the setconf if it would fail.
  2902. - If you specify a relative torrc path and you set RunAsDaemon in
  2903. your torrc, then it chdir()'s to the new directory. If you then
  2904. HUP, it tries to load the new torrc location, fails, and exits.
  2905. The fix: no longer allow a relative path to torrc when using -f.
  2906. - Check for integer overflows in more places, when adding elements
  2907. to smartlists. This could possibly prevent a buffer overflow
  2908. on malicious huge inputs.
  2909. o Security fixes, major:
  2910. - When we're printing strings from the network, don't try to print
  2911. non-printable characters. Now we're safer against shell escape
  2912. sequence exploits, and also against attacks to fool users into
  2913. misreading their logs.
  2914. - Implement entry guards: automatically choose a handful of entry
  2915. nodes and stick with them for all circuits. Only pick new guards
  2916. when the ones you have are unsuitable, and if the old guards
  2917. become suitable again, switch back. This will increase security
  2918. dramatically against certain end-point attacks. The EntryNodes
  2919. config option now provides some hints about which entry guards you
  2920. want to use most; and StrictEntryNodes means to only use those.
  2921. Fixes CVE-2006-0414.
  2922. - Implement exit enclaves: if we know an IP address for the
  2923. destination, and there's a running Tor server at that address
  2924. which allows exit to the destination, then extend the circuit to
  2925. that exit first. This provides end-to-end encryption and end-to-end
  2926. authentication. Also, if the user wants a .exit address or enclave,
  2927. use 4 hops rather than 3, and cannibalize a general circ for it
  2928. if you can.
  2929. - Obey our firewall options more faithfully:
  2930. . If we can't get to a dirserver directly, try going via Tor.
  2931. . Don't ever try to connect (as a client) to a place our
  2932. firewall options forbid.
  2933. . If we specify a proxy and also firewall options, obey the
  2934. firewall options even when we're using the proxy: some proxies
  2935. can only proxy to certain destinations.
  2936. - Make clients regenerate their keys when their IP address changes.
  2937. - For the OS X package's modified privoxy config file, comment
  2938. out the "logfile" line so we don't log everything passed
  2939. through privoxy.
  2940. - Our TLS handshakes were generating a single public/private
  2941. keypair for the TLS context, rather than making a new one for
  2942. each new connection. Oops. (But we were still rotating them
  2943. periodically, so it's not so bad.)
  2944. - When we were cannibalizing a circuit with a particular exit
  2945. node in mind, we weren't checking to see if that exit node was
  2946. already present earlier in the circuit. Now we are.
  2947. - Require server descriptors to list IPv4 addresses -- hostnames
  2948. are no longer allowed. This also fixes potential vulnerabilities
  2949. to servers providing hostnames as their address and then
  2950. preferentially resolving them so they can partition users.
  2951. - Our logic to decide if the OR we connected to was the right guy
  2952. was brittle and maybe open to a mitm for invalid routers.
  2953. o Security fixes, minor:
  2954. - Adjust tor-spec.txt to parameterize cell and key lengths. Now
  2955. Ian Goldberg can prove things about our handshake protocol more
  2956. easily.
  2957. - Make directory authorities generate a separate "guard" flag to
  2958. mean "would make a good entry guard". Clients now honor the
  2959. is_guard flag rather than looking at is_fast or is_stable.
  2960. - Try to list MyFamily elements by key, not by nickname, and warn
  2961. if we've not heard of a server.
  2962. - Start using RAND_bytes rather than RAND_pseudo_bytes from
  2963. OpenSSL. Also, reseed our entropy every hour, not just at
  2964. startup. And add entropy in 512-bit chunks, not 160-bit chunks.
  2965. - Refuse server descriptors where the fingerprint line doesn't match
  2966. the included identity key. Tor doesn't care, but other apps (and
  2967. humans) might actually be trusting the fingerprint line.
  2968. - We used to kill the circuit when we receive a relay command we
  2969. don't recognize. Now we just drop that cell.
  2970. - Fix a bug found by Lasse Overlier: when we were making internal
  2971. circuits (intended to be cannibalized later for rendezvous and
  2972. introduction circuits), we were picking them so that they had
  2973. useful exit nodes. There was no need for this, and it actually
  2974. aids some statistical attacks.
  2975. - Start treating internal circuits and exit circuits separately.
  2976. It's important to keep them separate because internal circuits
  2977. have their last hops picked like middle hops, rather than like
  2978. exit hops. So exiting on them will break the user's expectations.
  2979. - Fix a possible way to DoS dirservers.
  2980. - When the client asked for a rendezvous port that the hidden
  2981. service didn't want to provide, we were sending an IP address
  2982. back along with the end cell. Fortunately, it was zero. But stop
  2983. that anyway.
  2984. o Packaging improvements:
  2985. - Implement --with-libevent-dir option to ./configure. Improve
  2986. search techniques to find libevent, and use those for openssl too.
  2987. - Fix a couple of bugs in OpenSSL detection. Deal better when
  2988. there are multiple SSLs installed with different versions.
  2989. - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
  2990. - On non-gcc compilers (e.g. Solaris's cc), use "-g -O" instead of
  2991. "-Wall -g -O2".
  2992. - Make unit tests (and other invocations that aren't the real Tor)
  2993. run without launching listeners, creating subdirectories, and so on.
  2994. - The OS X installer was adding a symlink for tor_resolve but
  2995. the binary was called tor-resolve (reported by Thomas Hardly).
  2996. - Now we can target arch and OS in rpm builds (contributed by
  2997. Phobos). Also make the resulting dist-rpm filename match the
  2998. target arch.
  2999. - Apply Matt Ghali's --with-syslog-facility patch to ./configure
  3000. if you log to syslog and want something other than LOG_DAEMON.
  3001. - Fix the torify (tsocks) config file to not use Tor for localhost
  3002. connections.
  3003. - Start shipping socks-extensions.txt, tor-doc-unix.html,
  3004. tor-doc-server.html, and stylesheet.css in the tarball.
  3005. - Stop shipping tor-doc.html, INSTALL, and README in the tarball.
  3006. They are useless now.
  3007. - Add Peter Palfrader's contributed check-tor script. It lets you
  3008. easily check whether a given server (referenced by nickname)
  3009. is reachable by you.
  3010. - Add BSD-style contributed startup script "rc.subr" from Peter
  3011. Thoenen.
  3012. o Directory improvements -- new directory protocol:
  3013. - See tor/doc/dir-spec.txt for all the juicy details. Key points:
  3014. - Authorities and caches publish individual descriptors (by
  3015. digest, by fingerprint, by "all", and by "tell me yours").
  3016. - Clients don't download or use the old directory anymore. Now they
  3017. download network-statuses from the directory authorities, and
  3018. fetch individual server descriptors as needed from mirrors.
  3019. - Clients don't download descriptors of non-running servers.
  3020. - Download descriptors by digest, not by fingerprint. Caches try to
  3021. download all listed digests from authorities; clients try to
  3022. download "best" digests from caches. This avoids partitioning
  3023. and isolating attacks better.
  3024. - Only upload a new server descriptor when options change, 18
  3025. hours have passed, uptime is reset, or bandwidth changes a lot.
  3026. - Directory authorities silently throw away new descriptors that
  3027. haven't changed much if the timestamps are similar. We do this to
  3028. tolerate older Tor servers that upload a new descriptor every 15
  3029. minutes. (It seemed like a good idea at the time.)
  3030. - Clients choose directory servers from the network status lists,
  3031. not from their internal list of router descriptors. Now they can
  3032. go to caches directly rather than needing to go to authorities
  3033. to bootstrap the first set of descriptors.
  3034. - When picking a random directory, prefer non-authorities if any
  3035. are known.
  3036. - Add a new flag to network-status indicating whether the server
  3037. can answer v2 directory requests too.
  3038. - Directory mirrors now cache up to 16 unrecognized network-status
  3039. docs, so new directory authorities will be cached too.
  3040. - Stop parsing, storing, or using running-routers output (but
  3041. mirrors still cache and serve it).
  3042. - Clients consider a threshold of "versioning" directory authorities
  3043. before deciding whether to warn the user that he's obsolete.
  3044. - Authorities publish separate sorted lists of recommended versions
  3045. for clients and for servers.
  3046. - Change DirServers config line to note which dirs are v1 authorities.
  3047. - Put nicknames on the DirServer line, so we can refer to them
  3048. without requiring all our users to memorize their IP addresses.
  3049. - Remove option when getting directory cache to see whether they
  3050. support running-routers; they all do now. Replace it with one
  3051. to see whether caches support v2 stuff.
  3052. - Stop listing down or invalid nodes in the v1 directory. This
  3053. reduces its bulk by about 1/3, and reduces load on mirrors.
  3054. - Mirrors no longer cache the v1 directory as often.
  3055. - If we as a directory mirror don't know of any v1 directory
  3056. authorities, then don't try to cache any v1 directories.
  3057. o Other directory improvements:
  3058. - Add lefkada.eecs.harvard.edu and tor.dizum.com as fourth and
  3059. fifth authoritative directory servers.
  3060. - Directory authorities no longer require an open connection from
  3061. a server to consider him "reachable". We need this change because
  3062. when we add new directory authorities, old servers won't know not
  3063. to hang up on them.
  3064. - Dir authorities now do their own external reachability testing
  3065. of each server, and only list as running the ones they found to
  3066. be reachable. We also send back warnings to the server's logs if
  3067. it uploads a descriptor that we already believe is unreachable.
  3068. - Spread the directory authorities' reachability testing over the
  3069. entire testing interval, so we don't try to do 500 TLS's at once
  3070. every 20 minutes.
  3071. - Make the "stable" router flag in network-status be the median of
  3072. the uptimes of running valid servers, and make clients pay
  3073. attention to the network-status flags. Thus the cutoff adapts
  3074. to the stability of the network as a whole, making IRC, IM, etc
  3075. connections more reliable.
  3076. - Make the v2 dir's "Fast" flag based on relative capacity, just
  3077. like "Stable" is based on median uptime. Name everything in the
  3078. top 7/8 Fast, and only the top 1/2 gets to be a Guard.
  3079. - Retry directory requests if we fail to get an answer we like
  3080. from a given dirserver (we were retrying before, but only if
  3081. we fail to connect).
  3082. - Return a robots.txt on our dirport to discourage google indexing.
  3083. o Controller protocol improvements:
  3084. - Revised controller protocol (version 1) that uses ascii rather
  3085. than binary: tor/doc/control-spec.txt. Add supporting libraries
  3086. in python and java and c# so you can use the controller from your
  3087. applications without caring how our protocol works.
  3088. - Allow the DEBUG controller event to work again. Mark certain log
  3089. entries as "don't tell this to controllers", so we avoid cycles.
  3090. - New controller function "getinfo accounting", to ask how
  3091. many bytes we've used in this time period.
  3092. - Add a "resetconf" command so you can set config options like
  3093. AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
  3094. a config option in the torrc with no value, then it clears it
  3095. entirely (rather than setting it to its default).
  3096. - Add a "getinfo config-file" to tell us where torrc is. Also
  3097. expose guard nodes, config options/names.
  3098. - Add a "quit" command (when when using the controller manually).
  3099. - Add a new signal "newnym" to "change pseudonyms" -- that is, to
  3100. stop using any currently-dirty circuits for new streams, so we
  3101. don't link new actions to old actions. This also occurs on HUP
  3102. or "signal reload".
  3103. - If we would close a stream early (e.g. it asks for a .exit that
  3104. we know would refuse it) but the LeaveStreamsUnattached config
  3105. option is set by the controller, then don't close it.
  3106. - Add a new controller event type "authdir_newdescs" that allows
  3107. controllers to get all server descriptors that were uploaded to
  3108. a router in its role as directory authority.
  3109. - New controller option "getinfo desc/all-recent" to fetch the
  3110. latest server descriptor for every router that Tor knows about.
  3111. - Fix the controller's "attachstream 0" command to treat conn like
  3112. it just connected, doing address remapping, handling .exit and
  3113. .onion idioms, and so on. Now we're more uniform in making sure
  3114. that the controller hears about new and closing connections.
  3115. - Permit transitioning from ORPort==0 to ORPort!=0, and back, from
  3116. the controller. Also, rotate dns and cpu workers if the controller
  3117. changes options that will affect them; and initialize the dns
  3118. worker cache tree whether or not we start out as a server.
  3119. - Add a new circuit purpose 'controller' to let the controller ask
  3120. for a circuit that Tor won't try to use. Extend the "extendcircuit"
  3121. controller command to let you specify the purpose if you're starting
  3122. a new circuit. Add a new "setcircuitpurpose" controller command to
  3123. let you change a circuit's purpose after it's been created.
  3124. - Let the controller ask for "getinfo dir/server/foo" so it can ask
  3125. directly rather than connecting to the dir port. "getinfo
  3126. dir/status/foo" also works, but currently only if your DirPort
  3127. is enabled.
  3128. - Let the controller tell us about certain router descriptors
  3129. that it doesn't want Tor to use in circuits. Implement
  3130. "setrouterpurpose" and modify "+postdescriptor" to do this.
  3131. - If the controller's *setconf commands fail, collect an error
  3132. message in a string and hand it back to the controller -- don't
  3133. just tell them to go read their logs.
  3134. o Scalability, resource management, and performance:
  3135. - Fix a major load balance bug: we were round-robin reading in 16 KB
  3136. chunks, and servers with bandwidthrate of 20 KB, while downloading
  3137. a 600 KB directory, would starve their other connections. Now we
  3138. try to be a bit more fair.
  3139. - Be more conservative about whether to advertise our DirPort.
  3140. The main change is to not advertise if we're running at capacity
  3141. and either a) we could hibernate ever or b) our capacity is low
  3142. and we're using a default DirPort.
  3143. - We weren't cannibalizing circuits correctly for
  3144. CIRCUIT_PURPOSE_C_ESTABLISH_REND and
  3145. CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
  3146. build those from scratch. This should make hidden services faster.
  3147. - Predict required circuits better, with an eye toward making hidden
  3148. services faster on the service end.
  3149. - Compress exit policies even more: look for duplicate lines and
  3150. remove them.
  3151. - Generate 18.0.0.0/8 address policy format in descs when we can;
  3152. warn when the mask is not reducible to a bit-prefix.
  3153. - There used to be two ways to specify your listening ports in a
  3154. server descriptor: on the "router" line and with a separate "ports"
  3155. line. Remove support for the "ports" line.
  3156. - Reduce memory requirements in our structs by changing the order
  3157. of fields. Replace balanced trees with hash tables. Inline
  3158. bottleneck smartlist functions. Add a "Map from digest to void*"
  3159. abstraction so we can do less hex encoding/decoding, and use it
  3160. in router_get_by_digest(). Many other CPU and memory improvements.
  3161. - Allow tor_gzip_uncompress to extract as much as possible from
  3162. truncated compressed data. Try to extract as many
  3163. descriptors as possible from truncated http responses (when
  3164. purpose is DIR_PURPOSE_FETCH_ROUTERDESC).
  3165. - Make circ->onionskin a pointer, not a static array. moria2 was using
  3166. 125000 circuit_t's after it had been up for a few weeks, which
  3167. translates to 20+ megs of wasted space.
  3168. - The private half of our EDH handshake keys are now chosen out
  3169. of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
  3170. - Stop doing the complex voodoo overkill checking for insecure
  3171. Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
  3172. - Do round-robin writes for TLS of at most 16 kB per write. This
  3173. might be more fair on loaded Tor servers.
  3174. - Do not use unaligned memory access on alpha, mips, or mipsel.
  3175. It *works*, but is very slow, so we treat them as if it doesn't.
  3176. o Other bugfixes and improvements:
  3177. - Start storing useful information to $DATADIR/state, so we can
  3178. remember things across invocations of Tor. Retain unrecognized
  3179. lines so we can be forward-compatible, and write a TorVersion line
  3180. so we can be backward-compatible.
  3181. - If ORPort is set, Address is not explicitly set, and our hostname
  3182. resolves to a private IP address, try to use an interface address
  3183. if it has a public address. Now Windows machines that think of
  3184. themselves as localhost can guess their address.
  3185. - Regenerate our local descriptor if it's dirty and we try to use
  3186. it locally (e.g. if it changes during reachability detection).
  3187. This was causing some Tor servers to keep publishing the same
  3188. initial descriptor forever.
  3189. - Tor servers with dynamic IP addresses were needing to wait 18
  3190. hours before they could start doing reachability testing using
  3191. the new IP address and ports. This is because they were using
  3192. the internal descriptor to learn what to test, yet they were only
  3193. rebuilding the descriptor once they decided they were reachable.
  3194. - It turns out we couldn't bootstrap a network since we added
  3195. reachability detection in 0.1.0.1-rc. Good thing the Tor network
  3196. has never gone down. Add an AssumeReachable config option to let
  3197. servers and authorities bootstrap. When we're trying to build a
  3198. high-uptime or high-bandwidth circuit but there aren't enough
  3199. suitable servers, try being less picky rather than simply failing.
  3200. - Newly bootstrapped Tor networks couldn't establish hidden service
  3201. circuits until they had nodes with high uptime. Be more tolerant.
  3202. - Really busy servers were keeping enough circuits open on stable
  3203. connections that they were wrapping around the circuit_id
  3204. space. (It's only two bytes.) This exposed a bug where we would
  3205. feel free to reuse a circuit_id even if it still exists but has
  3206. been marked for close. Try to fix this bug. Some bug remains.
  3207. - When we fail to bind or listen on an incoming or outgoing
  3208. socket, we now close it before refusing, rather than just
  3209. leaking it. (Thanks to Peter Palfrader for finding.)
  3210. - Fix a file descriptor leak in start_daemon().
  3211. - On Windows, you can't always reopen a port right after you've
  3212. closed it. So change retry_listeners() to only close and re-open
  3213. ports that have changed.
  3214. - Workaround a problem with some http proxies that refuse GET
  3215. requests that specify "Content-Length: 0". Reported by Adrian.
  3216. - Recover better from TCP connections to Tor servers that are
  3217. broken but don't tell you (it happens!); and rotate TLS
  3218. connections once a week.
  3219. - Fix a scary-looking but apparently harmless bug where circuits
  3220. would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
  3221. servers, and never switch to state CIRCUIT_STATE_OPEN.
  3222. - Check for even more Windows version flags when writing the platform
  3223. string in server descriptors, and note any we don't recognize.
  3224. - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
  3225. get a better idea of why their circuits failed. Not used yet.
  3226. - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
  3227. We don't use them yet, but maybe one day our DNS resolver will be
  3228. able to discover them.
  3229. - Let people type "tor --install" as well as "tor -install" when they
  3230. want to make it an NT service.
  3231. - Looks like we were never delivering deflated (i.e. compressed)
  3232. running-routers lists, even when asked. Oops.
  3233. - We were leaking some memory every time the client changed IPs.
  3234. - Clean up more of the OpenSSL memory when exiting, so we can detect
  3235. memory leaks better.
  3236. - Never call free() on tor_malloc()d memory. This will help us
  3237. use dmalloc to detect memory leaks.
  3238. - Some Tor servers process billions of cells per day. These
  3239. statistics are now uint64_t's.
  3240. - Check [X-]Forwarded-For headers in HTTP requests when generating
  3241. log messages. This lets people run dirservers (and caches) behind
  3242. Apache but still know which IP addresses are causing warnings.
  3243. - Fix minor integer overflow in calculating when we expect to use up
  3244. our bandwidth allocation before hibernating.
  3245. - Lower the minimum required number of file descriptors to 1000,
  3246. so we can have some overhead for Valgrind on Linux, where the
  3247. default ulimit -n is 1024.
  3248. - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
  3249. and its existence is confusing some users.
  3250. o Config option fixes:
  3251. - Add a new config option ExitPolicyRejectPrivate which defaults
  3252. to on. Now all exit policies will begin with rejecting private
  3253. addresses, unless the server operator explicitly turns it off.
  3254. - Bump the default bandwidthrate to 3 MB, and burst to 6 MB.
  3255. - Add new ReachableORAddresses and ReachableDirAddresses options
  3256. that understand address policies. FascistFirewall is now a synonym
  3257. for "ReachableORAddresses *:443", "ReachableDirAddresses *:80".
  3258. - Start calling it FooListenAddress rather than FooBindAddress,
  3259. since few of our users know what it means to bind an address
  3260. or port.
  3261. - If the user gave Tor an odd number of command-line arguments,
  3262. we were silently ignoring the last one. Now we complain and fail.
  3263. This wins the oldest-bug prize -- this bug has been present since
  3264. November 2002, as released in Tor 0.0.0.
  3265. - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
  3266. torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
  3267. it would silently ignore the 6668.
  3268. - If we get a linelist or linelist_s config option from the torrc,
  3269. e.g. ExitPolicy, and it has no value, warn and skip rather than
  3270. silently resetting it to its default.
  3271. - Setconf was appending items to linelists, not clearing them.
  3272. - Add MyFamily to torrc.sample in the server section, so operators
  3273. will be more likely to learn that it exists.
  3274. - Make ContactInfo mandatory for authoritative directory servers.
  3275. - MaxConn has been obsolete for a while now. Document the ConnLimit
  3276. config option, which is a *minimum* number of file descriptors
  3277. that must be available else Tor refuses to start.
  3278. - Get rid of IgnoreVersion undocumented config option, and make us
  3279. only warn, never exit, when we're running an obsolete version.
  3280. - Make MonthlyAccountingStart config option truly obsolete now.
  3281. - Correct the man page entry on TrackHostExitsExpire.
  3282. - Let directory authorities start even if they don't specify an
  3283. Address config option.
  3284. - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
  3285. reflect the updated flags in our v2 dir protocol.
  3286. o Config option features:
  3287. - Add a new config option FastFirstHopPK (on by default) so clients
  3288. do a trivial crypto handshake for their first hop, since TLS has
  3289. already taken care of confidentiality and authentication.
  3290. - Let the user set ControlListenAddress in the torrc. This can be
  3291. dangerous, but there are some cases (like a secured LAN) where it
  3292. makes sense.
  3293. - New config options to help controllers: FetchServerDescriptors
  3294. and FetchHidServDescriptors for whether to fetch server
  3295. info and hidserv info or let the controller do it, and
  3296. PublishServerDescriptor and PublishHidServDescriptors.
  3297. - Also let the controller set the __AllDirActionsPrivate config
  3298. option if you want all directory fetches/publishes to happen via
  3299. Tor (it assumes your controller bootstraps your circuits).
  3300. - Add "HardwareAccel" config option: support for crypto hardware
  3301. accelerators via OpenSSL. Off by default, until we find somebody
  3302. smart who can test it for us. (It appears to produce seg faults
  3303. in at least some cases.)
  3304. - New config option "AuthDirRejectUnlisted" for directory authorities
  3305. as a panic button: if we get flooded with unusable servers we can
  3306. revert to only listing servers in the approved-routers file.
  3307. - Directory authorities can now reject/invalidate by key and IP,
  3308. with the config options "AuthDirInvalid" and "AuthDirReject", or
  3309. by marking a fingerprint as "!reject" or "!invalid" (as its
  3310. nickname) in the approved-routers file. This is useful since
  3311. currently we automatically list servers as running and usable
  3312. even if we know they're jerks.
  3313. - Add a new config option TestSocks so people can see whether their
  3314. applications are using socks4, socks4a, socks5-with-ip, or
  3315. socks5-with-fqdn. This way they don't have to keep mucking
  3316. with tcpdump and wondering if something got cached somewhere.
  3317. - Add "private:*" as an alias in configuration for policies. Now
  3318. you can simplify your exit policy rather than needing to list
  3319. every single internal or nonroutable network space.
  3320. - Accept "private:*" in routerdesc exit policies; not generated yet
  3321. because older Tors do not understand it.
  3322. - Add configuration option "V1AuthoritativeDirectory 1" which
  3323. moria1, moria2, and tor26 have set.
  3324. - Implement an option, VirtualAddrMask, to set which addresses
  3325. get handed out in response to mapaddress requests. This works
  3326. around a bug in tsocks where 127.0.0.0/8 is never socksified.
  3327. - Add a new config option FetchUselessDescriptors, off by default,
  3328. for when you plan to run "exitlist" on your client and you want
  3329. to know about even the non-running descriptors.
  3330. - SocksTimeout: How long do we let a socks connection wait
  3331. unattached before we fail it?
  3332. - CircuitBuildTimeout: Cull non-open circuits that were born
  3333. at least this many seconds ago.
  3334. - CircuitIdleTimeout: Cull open clean circuits that were born
  3335. at least this many seconds ago.
  3336. - New config option SafeSocks to reject all application connections
  3337. using unsafe socks protocols. Defaults to off.
  3338. o Improved and clearer log messages:
  3339. - Reduce clutter in server logs. We're going to try to make
  3340. them actually usable now. New config option ProtocolWarnings that
  3341. lets you hear about how _other Tors_ are breaking the protocol. Off
  3342. by default.
  3343. - Divide log messages into logging domains. Once we put some sort
  3344. of interface on this, it will let people looking at more verbose
  3345. log levels specify the topics they want to hear more about.
  3346. - Log server fingerprint on startup, so new server operators don't
  3347. have to go hunting around their filesystem for it.
  3348. - Provide dire warnings to any users who set DirServer manually;
  3349. move it out of torrc.sample and into torrc.complete.
  3350. - Make the log message less scary when all the dirservers are
  3351. temporarily unreachable.
  3352. - When tor_socketpair() fails in Windows, give a reasonable
  3353. Windows-style errno back.
  3354. - Improve tor_gettimeofday() granularity on windows.
  3355. - We were printing the number of idle dns workers incorrectly when
  3356. culling them.
  3357. - Handle duplicate lines in approved-routers files without warning.
  3358. - We were whining about using socks4 or socks5-with-local-lookup
  3359. even when it's an IP address in the "virtual" range we designed
  3360. exactly for this case.
  3361. - Check for named servers when looking them up by nickname;
  3362. warn when we're calling a non-named server by its nickname;
  3363. don't warn twice about the same name.
  3364. - Downgrade the dirserver log messages when whining about
  3365. unreachability.
  3366. - Correct "your server is reachable" log entries to indicate that
  3367. it was self-testing that told us so.
  3368. - If we're trying to be a Tor server and running Windows 95/98/ME
  3369. as a server, explain that we'll likely crash.
  3370. - Provide a more useful warn message when our onion queue gets full:
  3371. the CPU is too slow or the exit policy is too liberal.
  3372. - Don't warn when we receive a 503 from a dirserver/cache -- this
  3373. will pave the way for them being able to refuse if they're busy.
  3374. - When we fail to bind a listener, try to provide a more useful
  3375. log message: e.g., "Is Tor already running?"
  3376. - Only start testing reachability once we've established a
  3377. circuit. This will make startup on dir authorities less noisy.
  3378. - Don't try to upload hidden service descriptors until we have
  3379. established a circuit.
  3380. - Tor didn't warn when it failed to open a log file.
  3381. - Warn when listening on a public address for socks. We suspect a
  3382. lot of people are setting themselves up as open socks proxies,
  3383. and they have no idea that jerks on the Internet are using them,
  3384. since they simply proxy the traffic into the Tor network.
  3385. - Give a useful message when people run Tor as the wrong user,
  3386. rather than telling them to start chowning random directories.
  3387. - Fix a harmless bug that was causing Tor servers to log
  3388. "Got an end because of misc error, but we're not an AP. Closing."
  3389. - Fix wrong log message when you add a "HiddenServiceNodes" config
  3390. line without any HiddenServiceDir line (reported by Chris Thomas).
  3391. - Directory authorities now stop whining so loudly about bad
  3392. descriptors that they fetch from other dirservers. So when there's
  3393. a log complaint, it's for sure from a freshly uploaded descriptor.
  3394. - When logging via syslog, include the pid whenever we provide
  3395. a log entry. Suggested by Todd Fries.
  3396. - When we're shutting down and we do something like try to post a
  3397. server descriptor or rendezvous descriptor, don't complain that
  3398. we seem to be unreachable. Of course we are, we're shutting down.
  3399. - Change log line for unreachability to explicitly suggest /etc/hosts
  3400. as the culprit. Also make it clearer what IP address and ports we're
  3401. testing for reachability.
  3402. - Put quotes around user-supplied strings when logging so users are
  3403. more likely to realize if they add bad characters (like quotes)
  3404. to the torrc.
  3405. - NT service patch from Matt Edman to improve error messages on Win32.
  3406. Changes in version 0.1.0.17 - 2006-02-17
  3407. o Crash bugfixes on 0.1.0.x:
  3408. - When servers with a non-zero DirPort came out of hibernation,
  3409. sometimes they would trigger an assert.
  3410. o Other important bugfixes:
  3411. - On platforms that don't have getrlimit (like Windows), we were
  3412. artificially constraining ourselves to a max of 1024
  3413. connections. Now just assume that we can handle as many as 15000
  3414. connections. Hopefully this won't cause other problems.
  3415. o Backported features:
  3416. - When we're a server, a client asks for an old-style directory,
  3417. and our write bucket is empty, don't give it to him. This way
  3418. small servers can continue to serve the directory *sometimes*,
  3419. without getting overloaded.
  3420. - Whenever you get a 503 in response to a directory fetch, try
  3421. once more. This will become important once servers start sending
  3422. 503's whenever they feel busy.
  3423. - Fetch a new directory every 120 minutes, not every 40 minutes.
  3424. Now that we have hundreds of thousands of users running the old
  3425. directory algorithm, it's starting to hurt a lot.
  3426. - Bump up the period for forcing a hidden service descriptor upload
  3427. from 20 minutes to 1 hour.
  3428. Changes in version 0.1.0.16 - 2006-01-02
  3429. o Crash bugfixes on 0.1.0.x:
  3430. - On Windows, build with a libevent patch from "I-M Weasel" to avoid
  3431. corrupting the heap, losing FDs, or crashing when we need to resize
  3432. the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
  3433. - It turns out sparc64 platforms crash on unaligned memory access
  3434. too -- so detect and avoid this.
  3435. - Handle truncated compressed data correctly (by detecting it and
  3436. giving an error).
  3437. - Fix possible-but-unlikely free(NULL) in control.c.
  3438. - When we were closing connections, there was a rare case that
  3439. stomped on memory, triggering seg faults and asserts.
  3440. - Avoid potential infinite recursion when building a descriptor. (We
  3441. don't know that it ever happened, but better to fix it anyway.)
  3442. - We were neglecting to unlink marked circuits from soon-to-close OR
  3443. connections, which caused some rare scribbling on freed memory.
  3444. - Fix a memory stomping race bug when closing the joining point of two
  3445. rendezvous circuits.
  3446. - Fix an assert in time parsing found by Steven Murdoch.
  3447. o Other bugfixes on 0.1.0.x:
  3448. - When we're doing reachability testing, provide more useful log
  3449. messages so the operator knows what to expect.
  3450. - Do not check whether DirPort is reachable when we are suppressing
  3451. advertising it because of hibernation.
  3452. - When building with -static or on Solaris, we sometimes needed -ldl.
  3453. - One of the dirservers (tor26) changed its IP address.
  3454. - When we're deciding whether a stream has enough circuits around
  3455. that can handle it, count the freshly dirty ones and not the ones
  3456. that are so dirty they won't be able to handle it.
  3457. - When we're expiring old circuits, we had a logic error that caused
  3458. us to close new rendezvous circuits rather than old ones.
  3459. - Give a more helpful log message when you try to change ORPort via
  3460. the controller: you should upgrade Tor if you want that to work.
  3461. - We were failing to parse Tor versions that start with "Tor ".
  3462. - Tolerate faulty streams better: when a stream fails for reason
  3463. exitpolicy, stop assuming that the router is lying about his exit
  3464. policy. When a stream fails for reason misc, allow it to retry just
  3465. as if it was resolvefailed. When a stream has failed three times,
  3466. reset its failure count so we can try again and get all three tries.
  3467. Changes in version 0.1.0.15 - 2005-09-23
  3468. o Bugfixes on 0.1.0.x:
  3469. - Reject ports 465 and 587 (spam targets) in default exit policy.
  3470. - Don't crash when we don't have any spare file descriptors and we
  3471. try to spawn a dns or cpu worker.
  3472. - Get rid of IgnoreVersion undocumented config option, and make us
  3473. only warn, never exit, when we're running an obsolete version.
  3474. - Don't try to print a null string when your server finds itself to
  3475. be unreachable and the Address config option is empty.
  3476. - Make the numbers in read-history and write-history into uint64s,
  3477. so they don't overflow and publish negatives in the descriptor.
  3478. - Fix a minor memory leak in smartlist_string_remove().
  3479. - We were only allowing ourselves to upload a server descriptor at
  3480. most every 20 minutes, even if it changed earlier than that.
  3481. - Clean up log entries that pointed to old URLs.
  3482. Changes in version 0.1.0.14 - 2005-08-08
  3483. o Bugfixes on 0.1.0.x:
  3484. - Fix the other half of the bug with crypto handshakes
  3485. (CVE-2005-2643).
  3486. - Fix an assert trigger if you send a 'signal term' via the
  3487. controller when it's listening for 'event info' messages.
  3488. Changes in version 0.1.0.13 - 2005-08-04
  3489. o Bugfixes on 0.1.0.x:
  3490. - Fix a critical bug in the security of our crypto handshakes.
  3491. - Fix a size_t underflow in smartlist_join_strings2() that made
  3492. it do bad things when you hand it an empty smartlist.
  3493. - Fix Windows installer to ship Tor license (thanks to Aphex for
  3494. pointing out this oversight) and put a link to the doc directory
  3495. in the start menu.
  3496. - Explicitly set no-unaligned-access for sparc: it turns out the
  3497. new gcc's let you compile broken code, but that doesn't make it
  3498. not-broken.
  3499. Changes in version 0.1.0.12 - 2005-07-18
  3500. o New directory servers:
  3501. - tor26 has changed IP address.
  3502. o Bugfixes on 0.1.0.x:
  3503. - Fix a possible double-free in tor_gzip_uncompress().
  3504. - When --disable-threads is set, do not search for or link against
  3505. pthreads libraries.
  3506. - Don't trigger an assert if an authoritative directory server
  3507. claims its dirport is 0.
  3508. - Fix bug with removing Tor as an NT service: some people were
  3509. getting "The service did not return an error." Thanks to Matt
  3510. Edman for the fix.
  3511. Changes in version 0.1.0.11 - 2005-06-30
  3512. o Bugfixes on 0.1.0.x:
  3513. - Fix major security bug: servers were disregarding their
  3514. exit policies if clients behaved unexpectedly.
  3515. - Make OS X init script check for missing argument, so we don't
  3516. confuse users who invoke it incorrectly.
  3517. - Fix a seg fault in "tor --hash-password foo".
  3518. - The MAPADDRESS control command was broken.
  3519. Changes in version 0.1.0.10 - 2005-06-14
  3520. o Fixes on Win32:
  3521. - Make NT services work and start on startup on Win32 (based on
  3522. patch by Matt Edman). See the FAQ entry for details.
  3523. - Make 'platform' string in descriptor more accurate for Win32
  3524. servers, so it's not just "unknown platform".
  3525. - REUSEADDR on normal platforms means you can rebind to the port
  3526. right after somebody else has let it go. But REUSEADDR on Win32
  3527. means you can bind to the port _even when somebody else already
  3528. has it bound_! So, don't do that on Win32.
  3529. - Clean up the log messages when starting on Win32 with no config
  3530. file.
  3531. - Allow seeding the RNG on Win32 even when you're not running as
  3532. Administrator. If seeding the RNG on Win32 fails, quit.
  3533. o Assert / crash bugs:
  3534. - Refuse relay cells that claim to have a length larger than the
  3535. maximum allowed. This prevents a potential attack that could read
  3536. arbitrary memory (e.g. keys) from an exit server's process
  3537. (CVE-2005-2050).
  3538. - If unofficial Tor clients connect and send weird TLS certs, our
  3539. Tor server triggers an assert. Stop asserting, and start handling
  3540. TLS errors better in other situations too.
  3541. - Fix a race condition that can trigger an assert when we have a
  3542. pending create cell and an OR connection attempt fails.
  3543. o Resource leaks:
  3544. - Use pthreads for worker processes rather than forking. This was
  3545. forced because when we forked, we ended up wasting a lot of
  3546. duplicate ram over time.
  3547. - Also switch to foo_r versions of some library calls to allow
  3548. reentry and threadsafeness.
  3549. - Implement --disable-threads configure option. Disable threads on
  3550. netbsd and openbsd by default, because they have no reentrant
  3551. resolver functions (!), and on solaris since it has other
  3552. threading issues.
  3553. - Fix possible bug on threading platforms (e.g. win32) which was
  3554. leaking a file descriptor whenever a cpuworker or dnsworker died.
  3555. - Fix a minor memory leak when somebody establishes an introduction
  3556. point at your Tor server.
  3557. - Fix possible memory leak in tor_lookup_hostname(). (Thanks to
  3558. Adam Langley.)
  3559. - Add ./configure --with-dmalloc option, to track memory leaks.
  3560. - And try to free all memory on closing, so we can detect what
  3561. we're leaking.
  3562. o Protocol correctness:
  3563. - When we've connected to an OR and handshaked but didn't like
  3564. the result, we were closing the conn without sending destroy
  3565. cells back for pending circuits. Now send those destroys.
  3566. - Start sending 'truncated' cells back rather than destroy cells
  3567. if the circuit closes in front of you. This means we won't have
  3568. to abandon partially built circuits.
  3569. - Handle changed router status correctly when dirserver reloads
  3570. fingerprint file. We used to be dropping all unverified descriptors
  3571. right then. The bug was hidden because we would immediately
  3572. fetch a directory from another dirserver, which would include the
  3573. descriptors we just dropped.
  3574. - Revise tor-spec to add more/better stream end reasons.
  3575. - Revise all calls to connection_edge_end to avoid sending 'misc',
  3576. and to take errno into account where possible.
  3577. - Client now retries when streams end early for 'hibernating' or
  3578. 'resource limit' reasons, rather than failing them.
  3579. - Try to be more zealous about calling connection_edge_end when
  3580. things go bad with edge conns in connection.c.
  3581. o Robustness improvements:
  3582. - Better handling for heterogeneous / unreliable nodes:
  3583. - Annotate circuits with whether they aim to contain high uptime
  3584. nodes and/or high capacity nodes. When building circuits, choose
  3585. appropriate nodes.
  3586. - This means that every single node in an intro rend circuit,
  3587. not just the last one, will have a minimum uptime.
  3588. - New config option LongLivedPorts to indicate application streams
  3589. that will want high uptime circuits.
  3590. - Servers reset uptime when a dir fetch entirely fails. This
  3591. hopefully reflects stability of the server's network connectivity.
  3592. - If somebody starts his tor server in Jan 2004 and then fixes his
  3593. clock, don't make his published uptime be a year.
  3594. - Reset published uptime when we wake up from hibernation.
  3595. - Introduce a notion of 'internal' circs, which are chosen without
  3596. regard to the exit policy of the last hop. Intro and rendezvous
  3597. circs must be internal circs, to avoid leaking information. Resolve
  3598. and connect streams can use internal circs if they want.
  3599. - New circuit pooling algorithm: keep track of what destination ports
  3600. we've used recently (start out assuming we'll want to use 80), and
  3601. make sure to have enough circs around to satisfy these ports. Also
  3602. make sure to have 2 internal circs around if we've required internal
  3603. circs lately (and with high uptime if we've seen that lately too).
  3604. - Turn addr_policy_compare from a tristate to a quadstate; this should
  3605. help address our "Ah, you allow 1.2.3.4:80. You are a good choice
  3606. for google.com" problem.
  3607. - When a client asks us for a dir mirror and we don't have one,
  3608. launch an attempt to get a fresh one.
  3609. - First cut at support for "create-fast" cells. Clients can use
  3610. these when extending to their first hop, since the TLS already
  3611. provides forward secrecy and authentication. Not enabled on
  3612. clients yet.
  3613. o Reachability testing.
  3614. - Your Tor server will automatically try to see if its ORPort and
  3615. DirPort are reachable from the outside, and it won't upload its
  3616. descriptor until it decides at least ORPort is reachable (when
  3617. DirPort is not yet found reachable, publish it as zero).
  3618. - When building testing circs for ORPort testing, use only
  3619. high-bandwidth nodes, so fewer circuits fail.
  3620. - Notice when our IP changes, and reset stats/uptime/reachability.
  3621. - Authdirservers don't do ORPort reachability detection, since
  3622. they're in clique mode, so it will be rare to find a server not
  3623. already connected to them.
  3624. - Authdirservers now automatically approve nodes running 0.1.0.2-rc
  3625. or later.
  3626. o Dirserver fixes:
  3627. - Now we allow two unverified servers with the same nickname
  3628. but different keys. But if a nickname is verified, only that
  3629. nickname+key are allowed.
  3630. - If you're an authdirserver connecting to an address:port,
  3631. and it's not the OR you were expecting, forget about that
  3632. descriptor. If he *was* the one you were expecting, then forget
  3633. about all other descriptors for that address:port.
  3634. - Allow servers to publish descriptors from 12 hours in the future.
  3635. Corollary: only whine about clock skew from the dirserver if
  3636. he's a trusted dirserver (since now even verified servers could
  3637. have quite wrong clocks).
  3638. - Require servers that use the default dirservers to have public IP
  3639. addresses. We have too many servers that are configured with private
  3640. IPs and their admins never notice the log entries complaining that
  3641. their descriptors are being rejected.
  3642. o Efficiency improvements:
  3643. - Use libevent. Now we can use faster async cores (like epoll, kpoll,
  3644. and /dev/poll), and hopefully work better on Windows too.
  3645. - Apple's OS X 10.4.0 ships with a broken kqueue API, and using
  3646. kqueue on 10.3.9 causes kernel panics. Don't use kqueue on OS X.
  3647. - Find libevent even if it's hiding in /usr/local/ and your
  3648. CFLAGS and LDFLAGS don't tell you to look there.
  3649. - Be able to link with libevent as a shared library (the default
  3650. after 1.0d), even if it's hiding in /usr/local/lib and even
  3651. if you haven't added /usr/local/lib to your /etc/ld.so.conf,
  3652. assuming you're running gcc. Otherwise fail and give a useful
  3653. error message.
  3654. - Switch to a new buffer management algorithm, which tries to avoid
  3655. reallocing and copying quite as much. In first tests it looks like
  3656. it uses *more* memory on average, but less cpu.
  3657. - Switch our internal buffers implementation to use a ring buffer,
  3658. to hopefully improve performance for fast servers a lot.
  3659. - Reenable the part of the code that tries to flush as soon as an
  3660. OR outbuf has a full TLS record available. Perhaps this will make
  3661. OR outbufs not grow as huge except in rare cases, thus saving lots
  3662. of CPU time plus memory.
  3663. - Improve performance for dirservers: stop re-parsing the whole
  3664. directory every time you regenerate it.
  3665. - Keep a big splay tree of (circid,orconn)->circuit mappings to make
  3666. it much faster to look up a circuit for each relay cell.
  3667. - Remove most calls to assert_all_pending_dns_resolves_ok(),
  3668. since they're eating our cpu on exit nodes.
  3669. - Stop wasting time doing a case insensitive comparison for every
  3670. dns name every time we do any lookup. Canonicalize the names to
  3671. lowercase when you first see them.
  3672. o Hidden services:
  3673. - Handle unavailable hidden services better. Handle slow or busy
  3674. hidden services better.
  3675. - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
  3676. circ as necessary, if there are any completed ones lying around
  3677. when we try to launch one.
  3678. - Make hidden services try to establish a rendezvous for 30 seconds
  3679. after fetching the descriptor, rather than for n (where n=3)
  3680. attempts to build a circuit.
  3681. - Adjust maximum skew and age for rendezvous descriptors: let skew
  3682. be 48 hours rather than 90 minutes.
  3683. - Reject malformed .onion addresses rather then passing them on as
  3684. normal web requests.
  3685. o Controller:
  3686. - More Tor controller support. See
  3687. http://tor.eff.org/doc/control-spec.txt for all the new features,
  3688. including signals to emulate unix signals from any platform;
  3689. redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
  3690. closestream; closecircuit; etc.
  3691. - Encode hashed controller passwords in hex instead of base64,
  3692. to make it easier to write controllers.
  3693. - Revise control spec and implementation to allow all log messages to
  3694. be sent to controller with their severities intact (suggested by
  3695. Matt Edman). Disable debug-level logs while delivering a debug-level
  3696. log to the controller, to prevent loop. Update TorControl to handle
  3697. new log event types.
  3698. o New config options/defaults:
  3699. - Begin scrubbing sensitive strings from logs by default. Turn off
  3700. the config option SafeLogging if you need to do debugging.
  3701. - New exit policy: accept most low-numbered ports, rather than
  3702. rejecting most low-numbered ports.
  3703. - Put a note in the torrc about abuse potential with the default
  3704. exit policy.
  3705. - Add support for CONNECTing through https proxies, with "HttpsProxy"
  3706. config option.
  3707. - Add HttpProxyAuthenticator and HttpsProxyAuthenticator support
  3708. based on patch from Adam Langley (basic auth only).
  3709. - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
  3710. the fast servers that have been joining lately. (Clients are now
  3711. willing to load balance over up to 2 MB of advertised bandwidth
  3712. capacity too.)
  3713. - New config option MaxAdvertisedBandwidth which lets you advertise
  3714. a low bandwidthrate (to not attract as many circuits) while still
  3715. allowing a higher bandwidthrate in reality.
  3716. - Require BandwidthRate to be at least 20kB/s for servers.
  3717. - Add a NoPublish config option, so you can be a server (e.g. for
  3718. testing running Tor servers in other Tor networks) without
  3719. publishing your descriptor to the primary dirservers.
  3720. - Add a new AddressMap config directive to rewrite incoming socks
  3721. addresses. This lets you, for example, declare an implicit
  3722. required exit node for certain sites.
  3723. - Add a new TrackHostExits config directive to trigger addressmaps
  3724. for certain incoming socks addresses -- for sites that break when
  3725. your exit keeps changing (based on patch from Mike Perry).
  3726. - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
  3727. which describes how often we retry making new circuits if current
  3728. ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
  3729. how long we're willing to make use of an already-dirty circuit.
  3730. - Change compiled-in SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to
  3731. a config option "ShutdownWaitLength" (when using kill -INT on
  3732. servers).
  3733. - Fix an edge case in parsing config options: if they say "--"
  3734. on the commandline, it's not a config option (thanks weasel).
  3735. - New config option DirAllowPrivateAddresses for authdirservers.
  3736. Now by default they refuse router descriptors that have non-IP or
  3737. private-IP addresses.
  3738. - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
  3739. smart" default value: low for servers and high for clients.
  3740. - Some people were putting "Address " in their torrc, and they had
  3741. a buggy resolver that resolved " " to 0.0.0.0. Oops.
  3742. - If DataDir is ~/.tor, and that expands to /.tor, then default to
  3743. LOCALSTATEDIR/tor instead.
  3744. - Implement --verify-config command-line option to check if your torrc
  3745. is valid without actually launching Tor.
  3746. o Logging improvements:
  3747. - When dirservers refuse a server descriptor, we now log its
  3748. contactinfo, platform, and the poster's IP address.
  3749. - Only warn once per nickname from add_nickname_list_to_smartlist()
  3750. per failure, so an entrynode or exitnode choice that's down won't
  3751. yell so much.
  3752. - When we're connecting to an OR and he's got a different nickname/key
  3753. than we were expecting, only complain loudly if we're an OP or a
  3754. dirserver. Complaining loudly to the OR admins just confuses them.
  3755. - Whine at you if you're a server and you don't set your contactinfo.
  3756. - Warn when exit policy implicitly allows local addresses.
  3757. - Give a better warning when some other server advertises an
  3758. ORPort that is actually an apache running ssl.
  3759. - If we get an incredibly skewed timestamp from a dirserver mirror
  3760. that isn't a verified OR, don't warn -- it's probably him that's
  3761. wrong.
  3762. - When a dirserver causes you to give a warn, mention which dirserver
  3763. it was.
  3764. - Initialize libevent later in the startup process, so the logs are
  3765. already established by the time we start logging libevent warns.
  3766. - Use correct errno on win32 if libevent fails.
  3767. - Check and warn about known-bad/slow libevent versions.
  3768. - Stop warning about sigpipes in the logs. We're going to
  3769. pretend that getting these occassionally is normal and fine.
  3770. o New contrib scripts:
  3771. - New experimental script tor/contrib/exitlist: a simple python
  3772. script to parse directories and find Tor nodes that exit to listed
  3773. addresses/ports.
  3774. - New experimental script tor/contrib/ExerciseServer.py (needs more
  3775. work) that uses the controller interface to build circuits and
  3776. fetch pages over them. This will help us bootstrap servers that
  3777. have lots of capacity but haven't noticed it yet.
  3778. - New experimental script tor/contrib/PathDemo.py (needs more work)
  3779. that uses the controller interface to let you choose whole paths
  3780. via addresses like
  3781. "<hostname>.<path,separated by dots>.<length of path>.path"
  3782. - New contributed script "privoxy-tor-toggle" to toggle whether
  3783. Privoxy uses Tor. Seems to be configured for Debian by default.
  3784. - Have torctl.in/tor.sh.in check for location of su binary (needed
  3785. on FreeBSD)
  3786. o Misc bugfixes:
  3787. - chdir() to your datadirectory at the *end* of the daemonize process,
  3788. not the beginning. This was a problem because the first time you
  3789. run tor, if your datadir isn't there, and you have runasdaemon set
  3790. to 1, it will try to chdir to it before it tries to create it. Oops.
  3791. - Fix several double-mark-for-close bugs, e.g. where we were finding
  3792. a conn for a cell even if that conn is already marked for close.
  3793. - Stop most cases of hanging up on a socks connection without sending
  3794. the socks reject.
  3795. - Fix a bug in the RPM package: set home directory for _tor to
  3796. something more reasonable when first installing.
  3797. - Stop putting nodename in the Platform string in server descriptors.
  3798. It doesn't actually help, and it is confusing/upsetting some people.
  3799. - When using preferred entry or exit nodes, ignore whether the
  3800. circuit wants uptime or capacity. They asked for the nodes, they
  3801. get the nodes.
  3802. - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
  3803. artificially capped at 500kB.
  3804. - Cache local dns resolves correctly even when they're .exit
  3805. addresses.
  3806. - If we're hibernating and we get a SIGINT, exit immediately.
  3807. - tor-resolve requests were ignoring .exit if there was a working circuit
  3808. they could use instead.
  3809. - Pay more attention to the ClientOnly config option.
  3810. - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in certain
  3811. installer screens; and don't put stuff into StartupItems unless
  3812. the user asks you to.
  3813. o Misc features:
  3814. - Rewrite address "serifos.exit" to "externalIP.serifos.exit"
  3815. rather than just rejecting it.
  3816. - If our clock jumps forward by 100 seconds or more, assume something
  3817. has gone wrong with our network and abandon all not-yet-used circs.
  3818. - When an application is using socks5, give him the whole variety of
  3819. potential socks5 responses (connect refused, host unreachable, etc),
  3820. rather than just "success" or "failure".
  3821. - A more sane version numbering system. See
  3822. http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
  3823. - Change version parsing logic: a version is "obsolete" if it is not
  3824. recommended and (1) there is a newer recommended version in the
  3825. same series, or (2) there are no recommended versions in the same
  3826. series, but there are some recommended versions in a newer series.
  3827. A version is "new" if it is newer than any recommended version in
  3828. the same series.
  3829. - Report HTTP reasons to client when getting a response from directory
  3830. servers -- so you can actually know what went wrong.
  3831. - Reject odd-looking addresses at the client (e.g. addresses that
  3832. contain a colon), rather than having the server drop them because
  3833. they're malformed.
  3834. - Stop publishing socksport in the directory, since it's not
  3835. actually meant to be public. For compatibility, publish a 0 there
  3836. for now.
  3837. - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
  3838. cookies to disk and doesn't log each web request to disk. (Thanks
  3839. to Brett Carrington for pointing this out.)
  3840. - Add OSX uninstall instructions. An actual uninstall script will
  3841. come later.
  3842. - Add "opt hibernating 1" to server descriptor to make it clearer
  3843. whether the server is hibernating.
  3844. Changes in version 0.0.9.10 - 2005-06-16
  3845. o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
  3846. - Refuse relay cells that claim to have a length larger than the
  3847. maximum allowed. This prevents a potential attack that could read
  3848. arbitrary memory (e.g. keys) from an exit server's process
  3849. (CVE-2005-2050).
  3850. Changes in version 0.0.9.9 - 2005-04-23
  3851. o Bugfixes on 0.0.9.x:
  3852. - If unofficial Tor clients connect and send weird TLS certs, our
  3853. Tor server triggers an assert. This release contains a minimal
  3854. backport from the broader fix that we put into 0.1.0.4-rc.
  3855. Changes in version 0.0.9.8 - 2005-04-07
  3856. o Bugfixes on 0.0.9.x:
  3857. - We have a bug that I haven't found yet. Sometimes, very rarely,
  3858. cpuworkers get stuck in the 'busy' state, even though the cpuworker
  3859. thinks of itself as idle. This meant that no new circuits ever got
  3860. established. Here's a workaround to kill any cpuworker that's been
  3861. busy for more than 100 seconds.
  3862. Changes in version 0.0.9.7 - 2005-04-01
  3863. o Bugfixes on 0.0.9.x:
  3864. - Fix another race crash bug (thanks to Glenn Fink for reporting).
  3865. - Compare identity to identity, not to nickname, when extending to
  3866. a router not already in the directory. This was preventing us from
  3867. extending to unknown routers. Oops.
  3868. - Make sure to create OS X Tor user in <500 range, so we aren't
  3869. creating actual system users.
  3870. - Note where connection-that-hasn't-sent-end was marked, and fix
  3871. a few really loud instances of this harmless bug (it's fixed more
  3872. in 0.1.0.x).
  3873. Changes in version 0.0.9.6 - 2005-03-24
  3874. o Bugfixes on 0.0.9.x (crashes and asserts):
  3875. - Add new end stream reasons to maintainance branch. Fix bug where
  3876. reason (8) could trigger an assert. Prevent bug from recurring.
  3877. - Apparently win32 stat wants paths to not end with a slash.
  3878. - Fix assert triggers in assert_cpath_layer_ok(), where we were
  3879. blowing away the circuit that conn->cpath_layer points to, then
  3880. checking to see if the circ is well-formed. Backport check to make
  3881. sure we dont use the cpath on a closed connection.
  3882. - Prevent circuit_resume_edge_reading_helper() from trying to package
  3883. inbufs for marked-for-close streams.
  3884. - Don't crash on hup if your options->address has become unresolvable.
  3885. - Some systems (like OS X) sometimes accept() a connection and tell
  3886. you the remote host is 0.0.0.0:0. If this happens, due to some
  3887. other mis-features, we get confused; so refuse the conn for now.
  3888. o Bugfixes on 0.0.9.x (other):
  3889. - Fix harmless but scary "Unrecognized content encoding" warn message.
  3890. - Add new stream error reason: TORPROTOCOL reason means "you are not
  3891. speaking a version of Tor I understand; say bye-bye to your stream."
  3892. - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
  3893. into the future, now that we are more tolerant of skew. This
  3894. resolves a bug where a Tor server would refuse to cache a directory
  3895. because all the directories it gets are too far in the future;
  3896. yet the Tor server never logs any complaints about clock skew.
  3897. - Mac packaging magic: make man pages useable, and do not overwrite
  3898. existing torrc files.
  3899. - Make OS X log happily to /var/log/tor/tor.log
  3900. Changes in version 0.0.9.5 - 2005-02-22
  3901. o Bugfixes on 0.0.9.x:
  3902. - Fix an assert race at exit nodes when resolve requests fail.
  3903. - Stop picking unverified dir mirrors--it only leads to misery.
  3904. - Patch from Matt Edman to make NT services work better. Service
  3905. support is still not compiled into the executable by default.
  3906. - Patch from Dmitri Bely so the Tor service runs better under
  3907. the win32 SYSTEM account.
  3908. - Make tor-resolve actually work (?) on Win32.
  3909. - Fix a sign bug when getrlimit claims to have 4+ billion
  3910. file descriptors available.
  3911. - Stop refusing to start when bandwidthburst == bandwidthrate.
  3912. - When create cells have been on the onion queue more than five
  3913. seconds, just send back a destroy and take them off the list.
  3914. Changes in version 0.0.9.4 - 2005-02-03
  3915. o Bugfixes on 0.0.9:
  3916. - Fix an assert bug that took down most of our servers: when
  3917. a server claims to have 1 GB of bandwidthburst, don't
  3918. freak out.
  3919. - Don't crash as badly if we have spawned the max allowed number
  3920. of dnsworkers, or we're out of file descriptors.
  3921. - Block more file-sharing ports in the default exit policy.
  3922. - MaxConn is now automatically set to the hard limit of max
  3923. file descriptors we're allowed (ulimit -n), minus a few for
  3924. logs, etc.
  3925. - Give a clearer message when servers need to raise their
  3926. ulimit -n when they start running out of file descriptors.
  3927. - SGI Compatibility patches from Jan Schaumann.
  3928. - Tolerate a corrupt cached directory better.
  3929. - When a dirserver hasn't approved your server, list which one.
  3930. - Go into soft hibernation after 95% of the bandwidth is used,
  3931. not 99%. This is especially important for daily hibernators who
  3932. have a small accounting max. Hopefully it will result in fewer
  3933. cut connections when the hard hibernation starts.
  3934. - Load-balance better when using servers that claim more than
  3935. 800kB/s of capacity.
  3936. - Make NT services work (experimental, only used if compiled in).
  3937. Changes in version 0.0.9.3 - 2005-01-21
  3938. o Bugfixes on 0.0.9:
  3939. - Backport the cpu use fixes from main branch, so busy servers won't
  3940. need as much processor time.
  3941. - Work better when we go offline and then come back, or when we
  3942. run Tor at boot before the network is up. We do this by
  3943. optimistically trying to fetch a new directory whenever an
  3944. application request comes in and we think we're offline -- the
  3945. human is hopefully a good measure of when the network is back.
  3946. - Backport some minimal hidserv bugfixes: keep rend circuits open as
  3947. long as you keep using them; actually publish hidserv descriptors
  3948. shortly after they change, rather than waiting 20-40 minutes.
  3949. - Enable Mac startup script by default.
  3950. - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
  3951. - When you update AllowUnverifiedNodes or FirewallPorts via the
  3952. controller's setconf feature, we were always appending, never
  3953. resetting.
  3954. - When you update HiddenServiceDir via setconf, it was screwing up
  3955. the order of reading the lines, making it fail.
  3956. - Do not rewrite a cached directory back to the cache; otherwise we
  3957. will think it is recent and not fetch a newer one on startup.
  3958. - Workaround for webservers that lie about Content-Encoding: Tor
  3959. now tries to autodetect compressed directories and compression
  3960. itself. This lets us Proxypass dir fetches through apache.
  3961. Changes in version 0.0.9.2 - 2005-01-04
  3962. o Bugfixes on 0.0.9 (crashes and asserts):
  3963. - Fix an assert on startup when the disk is full and you're logging
  3964. to a file.
  3965. - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
  3966. style address, then we'd crash.
  3967. - Fix an assert trigger when the running-routers string we get from
  3968. a dirserver is broken.
  3969. - Make worker threads start and run on win32. Now win32 servers
  3970. may work better.
  3971. - Bandaid (not actually fix, but now it doesn't crash) an assert
  3972. where the dns worker dies mysteriously and the main Tor process
  3973. doesn't remember anything about the address it was resolving.
  3974. o Bugfixes on 0.0.9 (Win32):
  3975. - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
  3976. name out of the warning/assert messages.
  3977. - Fix a superficial "unhandled error on read" bug on win32.
  3978. - The win32 installer no longer requires a click-through for our
  3979. license, since our Free Software license grants rights but does not
  3980. take any away.
  3981. - Win32: When connecting to a dirserver fails, try another one
  3982. immediately. (This was already working for non-win32 Tors.)
  3983. - Stop trying to parse $HOME on win32 when hunting for default
  3984. DataDirectory.
  3985. - Make tor-resolve.c work on win32 by calling network_init().
  3986. o Bugfixes on 0.0.9 (other):
  3987. - Make 0.0.9.x build on Solaris again.
  3988. - Due to a fencepost error, we were blowing away the \n when reporting
  3989. confvalue items in the controller. So asking for multiple config
  3990. values at once couldn't work.
  3991. - When listing circuits that are pending on an opening OR connection,
  3992. if we're an OR we were listing circuits that *end* at us as
  3993. being pending on every listener, dns/cpu worker, etc. Stop that.
  3994. - Dirservers were failing to create 'running-routers' or 'directory'
  3995. strings if we had more than some threshold of routers. Fix them so
  3996. they can handle any number of routers.
  3997. - Fix a superficial "Duplicate mark for close" bug.
  3998. - Stop checking for clock skew for OR connections, even for servers.
  3999. - Fix a fencepost error that was chopping off the last letter of any
  4000. nickname that is the maximum allowed nickname length.
  4001. - Update URLs in log messages so they point to the new website.
  4002. - Fix a potential problem in mangling server private keys while
  4003. writing to disk (not triggered yet, as far as we know).
  4004. - Include the licenses for other free software we include in Tor,
  4005. now that we're shipping binary distributions more regularly.
  4006. Changes in version 0.0.9.1 - 2004-12-15
  4007. o Bugfixes on 0.0.9:
  4008. - Make hibernation actually work.
  4009. - Make HashedControlPassword config option work.
  4010. - When we're reporting event circuit status to a controller,
  4011. don't use the stream status code.
  4012. Changes in version 0.0.9 - 2004-12-12
  4013. o Bugfixes on 0.0.8.1 (Crashes and asserts):
  4014. - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
  4015. write() call will fail and we handle it there.
  4016. - When we run out of disk space, or other log writing error, don't
  4017. crash. Just stop logging to that log and continue.
  4018. - Fix isspace() and friends so they still make Solaris happy
  4019. but also so they don't trigger asserts on win32.
  4020. - Fix assert failure on malformed socks4a requests.
  4021. - Fix an assert bug where a hidden service provider would fail if
  4022. the first hop of his rendezvous circuit was down.
  4023. - Better handling of size_t vs int, so we're more robust on 64
  4024. bit platforms.
  4025. o Bugfixes on 0.0.8.1 (Win32):
  4026. - Make windows sockets actually non-blocking (oops), and handle
  4027. win32 socket errors better.
  4028. - Fix parse_iso_time on platforms without strptime (eg win32).
  4029. - win32: when being multithreaded, leave parent fdarray open.
  4030. - Better handling of winsock includes on non-MSV win32 compilers.
  4031. - Change our file IO stuff (especially wrt OpenSSL) so win32 is
  4032. happier.
  4033. - Make unit tests work on win32.
  4034. o Bugfixes on 0.0.8.1 (Path selection and streams):
  4035. - Calculate timeout for waiting for a connected cell from the time
  4036. we sent the begin cell, not from the time the stream started. If
  4037. it took a long time to establish the circuit, we would time out
  4038. right after sending the begin cell.
  4039. - Fix router_compare_addr_to_addr_policy: it was not treating a port
  4040. of * as always matching, so we were picking reject *:* nodes as
  4041. exit nodes too. Oops.
  4042. - When read() failed on a stream, we would close it without sending
  4043. back an end. So 'connection refused' would simply be ignored and
  4044. the user would get no response.
  4045. - Stop a sigpipe: when an 'end' cell races with eof from the app,
  4046. we shouldn't hold-open-until-flush if the eof arrived first.
  4047. - Let resolve conns retry/expire also, rather than sticking around
  4048. forever.
  4049. - Fix more dns related bugs: send back resolve_failed and end cells
  4050. more reliably when the resolve fails, rather than closing the
  4051. circuit and then trying to send the cell. Also attach dummy resolve
  4052. connections to a circuit *before* calling dns_resolve(), to fix
  4053. a bug where cached answers would never be sent in RESOLVED cells.
  4054. o Bugfixes on 0.0.8.1 (Circuits):
  4055. - Finally fix a bug that's been plaguing us for a year:
  4056. With high load, circuit package window was reaching 0. Whenever
  4057. we got a circuit-level sendme, we were reading a lot on each
  4058. socket, but only writing out a bit. So we would eventually reach
  4059. eof. This would be noticed and acted on even when there were still
  4060. bytes sitting in the inbuf.
  4061. - Use identity comparison, not nickname comparison, to choose which
  4062. half of circuit-ID-space each side gets to use. This is needed
  4063. because sometimes we think of a router as a nickname, and sometimes
  4064. as a hex ID, and we can't predict what the other side will do.
  4065. o Bugfixes on 0.0.8.1 (Other):
  4066. - Fix a whole slew of memory leaks.
  4067. - Disallow NDEBUG. We don't ever want anybody to turn off debug.
  4068. - If we are using select, make sure we stay within FD_SETSIZE.
  4069. - When poll() is interrupted, we shouldn't believe the revents values.
  4070. - Add a FAST_SMARTLIST define to optionally inline smartlist_get
  4071. and smartlist_len, which are two major profiling offenders.
  4072. - If do_hup fails, actually notice.
  4073. - Flush the log file descriptor after we print "Tor opening log file",
  4074. so we don't see those messages days later.
  4075. - Hidden service operators now correctly handle version 1 style
  4076. INTRODUCE1 cells (nobody generates them still, so not a critical
  4077. bug).
  4078. - Handle more errnos from accept() without closing the listener.
  4079. Some OpenBSD machines were closing their listeners because
  4080. they ran out of file descriptors.
  4081. - Some people had wrapped their tor client/server in a script
  4082. that would restart it whenever it died. This did not play well
  4083. with our "shut down if your version is obsolete" code. Now people
  4084. don't fetch a new directory if their local cached version is
  4085. recent enough.
  4086. - Make our autogen.sh work on ksh as well as bash.
  4087. - Better torrc example lines for dirbindaddress and orbindaddress.
  4088. - Improved bounds checking on parsed ints (e.g. config options and
  4089. the ones we find in directories.)
  4090. - Stop using separate defaults for no-config-file and
  4091. empty-config-file. Now you have to explicitly turn off SocksPort,
  4092. if you don't want it open.
  4093. - We were starting to daemonize before we opened our logs, so if
  4094. there were any problems opening logs, we would complain to stderr,
  4095. which wouldn't work, and then mysteriously exit.
  4096. - If a verified OR connects to us before he's uploaded his descriptor,
  4097. or we verify him and hup but he still has the original TLS
  4098. connection, then conn->nickname is still set like he's unverified.
  4099. o Code security improvements, inspired by Ilja:
  4100. - tor_snprintf wrapper over snprintf with consistent (though not C99)
  4101. overflow behavior.
  4102. - Replace sprintf with tor_snprintf. (I think they were all safe, but
  4103. hey.)
  4104. - Replace strcpy/strncpy with strlcpy in more places.
  4105. - Avoid strcat; use tor_snprintf or strlcat instead.
  4106. o Features (circuits and streams):
  4107. - New circuit building strategy: keep a list of ports that we've
  4108. used in the past 6 hours, and always try to have 2 circuits open
  4109. or on the way that will handle each such port. Seed us with port
  4110. 80 so web users won't complain that Tor is "slow to start up".
  4111. - Make kill -USR1 dump more useful stats about circuits.
  4112. - When warning about retrying or giving up, print the address, so
  4113. the user knows which one it's talking about.
  4114. - If you haven't used a clean circuit in an hour, throw it away,
  4115. just to be on the safe side. (This means after 6 hours a totally
  4116. unused Tor client will have no circuits open.)
  4117. - Support "foo.nickname.exit" addresses, to let Alice request the
  4118. address "foo" as viewed by exit node "nickname". Based on a patch
  4119. from Geoff Goodell.
  4120. - If your requested entry or exit node has advertised bandwidth 0,
  4121. pick it anyway.
  4122. - Be more greedy about filling up relay cells -- we try reading again
  4123. once we've processed the stuff we read, in case enough has arrived
  4124. to fill the last cell completely.
  4125. - Refuse application socks connections to port 0.
  4126. - Use only 0.0.9pre1 and later servers for resolve cells.
  4127. o Features (bandwidth):
  4128. - Hibernation: New config option "AccountingMax" lets you
  4129. set how many bytes per month (in each direction) you want to
  4130. allow your server to consume. Rather than spreading those
  4131. bytes out evenly over the month, we instead hibernate for some
  4132. of the month and pop up at a deterministic time, work until
  4133. the bytes are consumed, then hibernate again. Config option
  4134. "MonthlyAccountingStart" lets you specify which day of the month
  4135. your billing cycle starts on.
  4136. - Implement weekly/monthly/daily accounting: now you specify your
  4137. hibernation properties by
  4138. AccountingMax N bytes|KB|MB|GB|TB
  4139. AccountingStart day|week|month [day] HH:MM
  4140. Defaults to "month 1 0:00".
  4141. - Let bandwidth and interval config options be specified as 5 bytes,
  4142. kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
  4143. o Features (directories):
  4144. - New "router-status" line in directory, to better bind each verified
  4145. nickname to its identity key.
  4146. - Clients can ask dirservers for /dir.z to get a compressed version
  4147. of the directory. Only works for servers running 0.0.9, of course.
  4148. - Make clients cache directories and use them to seed their router
  4149. lists at startup. This means clients have a datadir again.
  4150. - Respond to content-encoding headers by trying to uncompress as
  4151. appropriate.
  4152. - Clients and servers now fetch running-routers; cache
  4153. running-routers; compress running-routers; serve compressed
  4154. running-routers.z
  4155. - Make moria2 advertise a dirport of 80, so people behind firewalls
  4156. will be able to get a directory.
  4157. - Http proxy support
  4158. - Dirservers translate requests for http://%s:%d/x to /x
  4159. - You can specify "HttpProxy %s[:%d]" and all dir fetches will
  4160. be routed through this host.
  4161. - Clients ask for /tor/x rather than /x for new enough dirservers.
  4162. This way we can one day coexist peacefully with apache.
  4163. - Clients specify a "Host: %s%d" http header, to be compatible
  4164. with more proxies, and so running squid on an exit node can work.
  4165. - Protect dirservers from overzealous descriptor uploading -- wait
  4166. 10 seconds after directory gets dirty, before regenerating.
  4167. o Features (packages and install):
  4168. - Add NSI installer contributed by J Doe.
  4169. - Apply NT service patch from Osamu Fujino. Still needs more work.
  4170. - Commit VC6 and VC7 workspace/project files.
  4171. - Commit a tor.spec for making RPM files, with help from jbash.
  4172. - Add contrib/torctl.in contributed by Glenn Fink.
  4173. - Make expand_filename handle ~ and ~username.
  4174. - Use autoconf to enable largefile support where necessary. Use
  4175. ftello where available, since ftell can fail at 2GB.
  4176. - Ship src/win32/ in the tarball, so people can use it to build.
  4177. - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
  4178. is broken.
  4179. o Features (ui controller):
  4180. - Control interface: a separate program can now talk to your
  4181. client/server over a socket, and get/set config options, receive
  4182. notifications of circuits and streams starting/finishing/dying,
  4183. bandwidth used, etc. The next step is to get some GUIs working.
  4184. Let us know if you want to help out. See doc/control-spec.txt .
  4185. - Ship a contrib/tor-control.py as an example script to interact
  4186. with the control port.
  4187. - "tor --hash-password zzyxz" will output a salted password for
  4188. use in authenticating to the control interface.
  4189. - Implement the control-spec's SAVECONF command, to write your
  4190. configuration to torrc.
  4191. - Get cookie authentication for the controller closer to working.
  4192. - When set_conf changes our server descriptor, upload a new copy.
  4193. But don't upload it too often if there are frequent changes.
  4194. o Features (config and command-line):
  4195. - Deprecate unofficial config option abbreviations, and abbreviations
  4196. not on the command line.
  4197. - Configuration infrastructure support for warning on obsolete
  4198. options.
  4199. - Give a slightly more useful output for "tor -h".
  4200. - Break DirFetchPostPeriod into:
  4201. - DirFetchPeriod for fetching full directory,
  4202. - StatusFetchPeriod for fetching running-routers,
  4203. - DirPostPeriod for posting server descriptor,
  4204. - RendPostPeriod for posting hidden service descriptors.
  4205. - New log format in config:
  4206. "Log minsev[-maxsev] stdout|stderr|syslog" or
  4207. "Log minsev[-maxsev] file /var/foo"
  4208. - DirPolicy config option, to let people reject incoming addresses
  4209. from their dirserver.
  4210. - "tor --list-fingerprint" will list your identity key fingerprint
  4211. and then exit.
  4212. - Make tor --version --version dump the cvs Id of every file.
  4213. - New 'MyFamily nick1,...' config option for a server to
  4214. specify other servers that shouldn't be used in the same circuit
  4215. with it. Only believed if nick1 also specifies us.
  4216. - New 'NodeFamily nick1,nick2,...' config option for a client to
  4217. specify nodes that it doesn't want to use in the same circuit.
  4218. - New 'Redirectexit pattern address:port' config option for a
  4219. server to redirect exit connections, e.g. to a local squid.
  4220. - Add "pass" target for RedirectExit, to make it easier to break
  4221. out of a sequence of RedirectExit rules.
  4222. - Make the dirservers file obsolete.
  4223. - Include a dir-signing-key token in directories to tell the
  4224. parsing entity which key is being used to sign.
  4225. - Remove the built-in bulky default dirservers string.
  4226. - New config option "Dirserver %s:%d [fingerprint]", which can be
  4227. repeated as many times as needed. If no dirservers specified,
  4228. default to moria1,moria2,tor26.
  4229. - Make 'Routerfile' config option obsolete.
  4230. - Discourage people from setting their dirfetchpostperiod more often
  4231. than once per minute.
  4232. o Features (other):
  4233. - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
  4234. get back to normal.)
  4235. - Accept *:706 (silc) in default exit policy.
  4236. - Implement new versioning format for post 0.1.
  4237. - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
  4238. log more informatively.
  4239. - Check clock skew for verified servers, but allow unverified
  4240. servers and clients to have any clock skew.
  4241. - Make sure the hidden service descriptors are at a random offset
  4242. from each other, to hinder linkability.
  4243. - Clients now generate a TLS cert too, in preparation for having
  4244. them act more like real nodes.
  4245. - Add a pure-C tor-resolve implementation.
  4246. - Use getrlimit and friends to ensure we can reach MaxConn (currently
  4247. 1024) file descriptors.
  4248. - Raise the max dns workers from 50 to 100.
  4249. Changes in version 0.0.8.1 - 2004-10-13
  4250. o Bugfixes:
  4251. - Fix a seg fault that can be triggered remotely for Tor
  4252. clients/servers with an open dirport.
  4253. - Fix a rare assert trigger, where routerinfos for entries in
  4254. our cpath would expire while we're building the path.
  4255. - Fix a bug in OutboundBindAddress so it (hopefully) works.
  4256. - Fix a rare seg fault for people running hidden services on
  4257. intermittent connections.
  4258. - Fix a bug in parsing opt keywords with objects.
  4259. - Fix a stale pointer assert bug when a stream detaches and
  4260. reattaches.
  4261. - Fix a string format vulnerability (probably not exploitable)
  4262. in reporting stats locally.
  4263. - Fix an assert trigger: sometimes launching circuits can fail
  4264. immediately, e.g. because too many circuits have failed recently.
  4265. - Fix a compile warning on 64 bit platforms.
  4266. Changes in version 0.0.8 - 2004-08-25
  4267. o Bugfixes:
  4268. - Made our unit tests compile again on OpenBSD 3.5, and tor
  4269. itself compile again on OpenBSD on a sparc64.
  4270. - We were neglecting milliseconds when logging on win32, so
  4271. everything appeared to happen at the beginning of each second.
  4272. - Check directory signature _before_ you decide whether you're
  4273. you're running an obsolete version and should exit.
  4274. - Check directory signature _before_ you parse the running-routers
  4275. list to decide who's running.
  4276. - Check return value of fclose while writing to disk, so we don't
  4277. end up with broken files when servers run out of disk space.
  4278. - Port it to SunOS 5.9 / Athena
  4279. - Fix two bugs in saving onion keys to disk when rotating, so
  4280. hopefully we'll get fewer people using old onion keys.
  4281. - Remove our mostly unused -- and broken -- hex_encode()
  4282. function. Use base16_encode() instead. (Thanks to Timo Lindfors
  4283. for pointing out this bug.)
  4284. - Only pick and establish intro points after we've gotten a
  4285. directory.
  4286. - Fix assert triggers: if the other side returns an address 0.0.0.0,
  4287. don't put it into the client dns cache.
  4288. - If a begin failed due to exit policy, but we believe the IP
  4289. address should have been allowed, switch that router to exitpolicy
  4290. reject *:* until we get our next directory.
  4291. o Protocol changes:
  4292. - 'Extend' relay cell payloads now include the digest of the
  4293. intended next hop's identity key. Now we can verify that we're
  4294. extending to the right router, and also extend to routers we
  4295. hadn't heard of before.
  4296. o Features:
  4297. - Tor nodes can now act as relays (with an advertised ORPort)
  4298. without being manually verified by the dirserver operators.
  4299. - Uploaded descriptors of unverified routers are now accepted
  4300. by the dirservers, and included in the directory.
  4301. - Verified routers are listed by nickname in the running-routers
  4302. list; unverified routers are listed as "$<fingerprint>".
  4303. - We now use hash-of-identity-key in most places rather than
  4304. nickname or addr:port, for improved security/flexibility.
  4305. - AllowUnverifiedNodes config option to let circuits choose no-name
  4306. routers in entry,middle,exit,introduction,rendezvous positions.
  4307. Allow middle and rendezvous positions by default.
  4308. - When picking unverified routers, skip those with low uptime and/or
  4309. low bandwidth, depending on what properties you care about.
  4310. - ClientOnly option for nodes that never want to become servers.
  4311. - Directory caching.
  4312. - "AuthoritativeDir 1" option for the official dirservers.
  4313. - Now other nodes (clients and servers) will cache the latest
  4314. directory they've pulled down.
  4315. - They can enable their DirPort to serve it to others.
  4316. - Clients will pull down a directory from any node with an open
  4317. DirPort, and check the signature/timestamp correctly.
  4318. - Authoritative dirservers now fetch directories from other
  4319. authdirservers, to stay better synced.
  4320. - Running-routers list tells who's down also, along with noting
  4321. if they're verified (listed by nickname) or unverified (listed
  4322. by hash-of-key).
  4323. - Allow dirservers to serve running-router list separately.
  4324. This isn't used yet.
  4325. - You can now fetch $DIRURL/running-routers to get just the
  4326. running-routers line, not the whole descriptor list. (But
  4327. clients don't use this yet.)
  4328. - Clients choose nodes proportional to advertised bandwidth.
  4329. - Clients avoid using nodes with low uptime as introduction points.
  4330. - Handle servers with dynamic IP addresses: don't just replace
  4331. options->Address with the resolved one at startup, and
  4332. detect our address right before we make a routerinfo each time.
  4333. - 'FascistFirewall' option to pick dirservers and ORs on specific
  4334. ports; plus 'FirewallPorts' config option to tell FascistFirewall
  4335. which ports are open. (Defaults to 80,443)
  4336. - Try other dirservers immediately if the one you try is down. This
  4337. should tolerate down dirservers better now.
  4338. - ORs connect-on-demand to other ORs
  4339. - If you get an extend cell to an OR you're not connected to,
  4340. connect, handshake, and forward the create cell.
  4341. - The authoritative dirservers stay connected to everybody,
  4342. and everybody stays connected to 0.0.7 servers, but otherwise
  4343. clients/servers expire unused connections after 5 minutes.
  4344. - When servers get a sigint, they delay 30 seconds (refusing new
  4345. connections) then exit. A second sigint causes immediate exit.
  4346. - File and name management:
  4347. - Look for .torrc if no CONFDIR "torrc" is found.
  4348. - If no datadir is defined, then choose, make, and secure ~/.tor
  4349. as datadir.
  4350. - If torrc not found, exitpolicy reject *:*.
  4351. - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
  4352. - If no nickname is defined, derive default from hostname.
  4353. - Rename secret key files, e.g. identity.key -> secret_id_key,
  4354. to discourage people from mailing their identity key to tor-ops.
  4355. - Refuse to build a circuit before the directory has arrived --
  4356. it won't work anyway, since you won't know the right onion keys
  4357. to use.
  4358. - Parse tor version numbers so we can do an is-newer-than check
  4359. rather than an is-in-the-list check.
  4360. - New socks command 'resolve', to let us shim gethostbyname()
  4361. locally.
  4362. - A 'tor_resolve' script to access the socks resolve functionality.
  4363. - A new socks-extensions.txt doc file to describe our
  4364. interpretation and extensions to the socks protocols.
  4365. - Add a ContactInfo option, which gets published in descriptor.
  4366. - Write tor version at the top of each log file
  4367. - New docs in the tarball:
  4368. - tor-doc.html.
  4369. - Document that you should proxy your SSL traffic too.
  4370. - Log a warning if the user uses an unsafe socks variant, so people
  4371. are more likely to learn about privoxy or socat.
  4372. - Log a warning if you're running an unverified server, to let you
  4373. know you might want to get it verified.
  4374. - Change the default exit policy to reject the default edonkey,
  4375. kazaa, gnutella ports.
  4376. - Add replace_file() to util.[ch] to handle win32's rename().
  4377. - Publish OR uptime in descriptor (and thus in directory) too.
  4378. - Remember used bandwidth (both in and out), and publish 15-minute
  4379. snapshots for the past day into our descriptor.
  4380. - Be more aggressive about trying to make circuits when the network
  4381. has changed (e.g. when you unsuspend your laptop).
  4382. - Check for time skew on http headers; report date in response to
  4383. "GET /".
  4384. - If the entrynode config line has only one node, don't pick it as
  4385. an exitnode.
  4386. - Add strict{entry|exit}nodes config options. If set to 1, then
  4387. we refuse to build circuits that don't include the specified entry
  4388. or exit nodes.
  4389. - OutboundBindAddress config option, to bind to a specific
  4390. IP address for outgoing connect()s.
  4391. - End truncated log entries (e.g. directories) with "[truncated]".
  4392. Changes in version 0.0.7.3 - 2004-08-12
  4393. o Stop dnsworkers from triggering an assert failure when you
  4394. ask them to resolve the host "".
  4395. Changes in version 0.0.7.2 - 2004-07-07
  4396. o A better fix for the 0.0.0.0 problem, that will hopefully
  4397. eliminate the remaining related assertion failures.
  4398. Changes in version 0.0.7.1 - 2004-07-04
  4399. o When an address resolves to 0.0.0.0, treat it as a failed resolve,
  4400. since internally we use 0.0.0.0 to signify "not yet resolved".
  4401. Changes in version 0.0.7 - 2004-06-07
  4402. o Fixes for crashes and other obnoxious bugs:
  4403. - Fix an epipe bug: sometimes when directory connections failed
  4404. to connect, we would give them a chance to flush before closing
  4405. them.
  4406. - When we detached from a circuit because of resolvefailed, we
  4407. would immediately try the same circuit twice more, and then
  4408. give up on the resolve thinking we'd tried three different
  4409. exit nodes.
  4410. - Limit the number of intro circuits we'll attempt to build for a
  4411. hidden service per 15-minute period.
  4412. - Check recommended-software string *early*, before actually parsing
  4413. the directory. Thus we can detect an obsolete version and exit,
  4414. even if the new directory format doesn't parse.
  4415. o Fixes for security bugs:
  4416. - Remember which nodes are dirservers when you startup, and if a
  4417. random OR enables his dirport, don't automatically assume he's
  4418. a trusted dirserver.
  4419. o Other bugfixes:
  4420. - Directory connections were asking the wrong poll socket to
  4421. start writing, and not asking themselves to start writing.
  4422. - When we detached from a circuit because we sent a begin but
  4423. didn't get a connected, we would use it again the first time;
  4424. but after that we would correctly switch to a different one.
  4425. - Stop warning when the first onion decrypt attempt fails; they
  4426. will sometimes legitimately fail now that we rotate keys.
  4427. - Override unaligned-access-ok check when $host_cpu is ia64 or
  4428. arm. Apparently they allow it but the kernel whines.
  4429. - Dirservers try to reconnect periodically too, in case connections
  4430. have failed.
  4431. - Fix some memory leaks in directory servers.
  4432. - Allow backslash in Win32 filenames.
  4433. - Made Tor build complain-free on FreeBSD, hopefully without
  4434. breaking other BSD builds. We'll see.
  4435. - Check directory signatures based on name of signer, not on whom
  4436. we got the directory from. This will let us cache directories more
  4437. easily.
  4438. - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
  4439. settings too.
  4440. o Features:
  4441. - Doxygen markup on all functions and global variables.
  4442. - Make directory functions update routerlist, not replace it. So
  4443. now directory disagreements are not so critical a problem.
  4444. - Remove the upper limit on number of descriptors in a dirserver's
  4445. directory (not that we were anywhere close).
  4446. - Allow multiple logfiles at different severity ranges.
  4447. - Allow *BindAddress to specify ":port" rather than setting *Port
  4448. separately. Allow multiple instances of each BindAddress config
  4449. option, so you can bind to multiple interfaces if you want.
  4450. - Allow multiple exit policy lines, which are processed in order.
  4451. Now we don't need that huge line with all the commas in it.
  4452. - Enable accept/reject policies on SOCKS connections, so you can bind
  4453. to 0.0.0.0 but still control who can use your OP.
  4454. - Updated the man page to reflect these features.
  4455. Changes in version 0.0.6.2 - 2004-05-16
  4456. o Our integrity-checking digest was checking only the most recent cell,
  4457. not the previous cells like we'd thought.
  4458. Thanks to Stefan Mark for finding the flaw!
  4459. Changes in version 0.0.6.1 - 2004-05-06
  4460. o Fix two bugs in our AES counter-mode implementation (this affected
  4461. onion-level stream encryption, but not TLS-level). It turns
  4462. out we were doing something much more akin to a 16-character
  4463. polyalphabetic cipher. Oops.
  4464. Thanks to Stefan Mark for finding the flaw!
  4465. o Retire moria3 as a directory server, and add tor26 as a directory
  4466. server.
  4467. Changes in version 0.0.6 - 2004-05-02
  4468. o Features:
  4469. - Hidden services and rendezvous points are implemented. Go to
  4470. http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
  4471. hidden services. (This only works via a socks4a proxy such as
  4472. Privoxy, and currently it's quite slow.)
  4473. - We now rotate link (tls context) keys and onion keys.
  4474. - CREATE cells now include oaep padding, so you can tell
  4475. if you decrypted them correctly.
  4476. - Retry stream correctly when we fail to connect because of
  4477. exit-policy-reject (should try another) or can't-resolve-address.
  4478. - When we hup a dirserver and we've *removed* a server from the
  4479. approved-routers list, now we remove that server from the
  4480. in-memory directories too.
  4481. - Add bandwidthburst to server descriptor.
  4482. - Directories now say which dirserver signed them.
  4483. - Use a tor_assert macro that logs failed assertions too.
  4484. - Since we don't support truncateds much, don't bother sending them;
  4485. just close the circ.
  4486. - Fetch randomness from /dev/urandom better (not via fopen/fread)
  4487. - Better debugging for tls errors
  4488. - Set Content-Type on the directory and hidserv descriptor.
  4489. - Remove IVs from cipher code, since AES-ctr has none.
  4490. o Bugfixes:
  4491. - Fix an assert trigger for exit nodes that's been plaguing us since
  4492. the days of 0.0.2prexx (thanks weasel!)
  4493. - Fix a bug where we were closing tls connections intermittently.
  4494. It turns out openssl keeps its errors around -- so if an error
  4495. happens, and you don't ask about it, and then another openssl
  4496. operation happens and succeeds, and you ask if there was an error,
  4497. it tells you about the first error.
  4498. - Fix a bug that's been lurking since 27 may 03 (!)
  4499. When passing back a destroy cell, we would use the wrong circ id.
  4500. - Don't crash if a conn that sent a begin has suddenly lost its circuit.
  4501. - Some versions of openssl have an SSL_pending function that erroneously
  4502. returns bytes when there is a non-application record pending.
  4503. - Win32 fixes. Tor now compiles on win32 with no warnings/errors.
  4504. o We were using an array of length zero in a few places.
  4505. o Win32's gethostbyname can't resolve an IP to an IP.
  4506. o Win32's close can't close a socket.
  4507. o Handle windows socket errors correctly.
  4508. o Portability:
  4509. - check for <sys/limits.h> so we build on FreeBSD again, and
  4510. <machine/limits.h> for NetBSD.
  4511. Changes in version 0.0.5 - 2004-03-30
  4512. o Install torrc as torrc.sample -- we no longer clobber your
  4513. torrc. (Woo!)
  4514. o Fix mangled-state bug in directory fetching (was causing sigpipes).
  4515. o Only build circuits after we've fetched the directory: clients were
  4516. using only the directory servers before they'd fetched a directory.
  4517. This also means longer startup time; so it goes.
  4518. o Fix an assert trigger where an OP would fail to handshake, and we'd
  4519. expect it to have a nickname.
  4520. o Work around a tsocks bug: do a socks reject when AP connection dies
  4521. early, else tsocks goes into an infinite loop.
  4522. o Hold socks connection open until reply is flushed (if possible)
  4523. o Make exit nodes resolve IPs to IPs immediately, rather than asking
  4524. the dns farm to do it.
  4525. o Fix c99 aliasing warnings in rephist.c
  4526. o Don't include server descriptors that are older than 24 hours in the
  4527. directory.
  4528. o Give socks 'reject' replies their whole 15s to attempt to flush,
  4529. rather than seeing the 60s timeout and assuming the flush had failed.
  4530. o Clean automake droppings from the cvs repository
  4531. o Add in a 'notice' log level for things the operator should hear
  4532. but that aren't warnings
  4533. Changes in version 0.0.4 - 2004-03-26
  4534. o When connecting to a dirserver or OR and the network is down,
  4535. we would crash.
  4536. Changes in version 0.0.3 - 2004-03-26
  4537. o Warn and fail if server chose a nickname with illegal characters
  4538. o Port to Solaris and Sparc:
  4539. - include missing header fcntl.h
  4540. - have autoconf find -lsocket -lnsl automatically
  4541. - deal with hardware word alignment
  4542. - make uname() work (solaris has a different return convention)
  4543. - switch from using signal() to sigaction()
  4544. o Preliminary work on reputation system:
  4545. - Keep statistics on success/fail of connect attempts; they're published
  4546. by kill -USR1 currently.
  4547. - Add a RunTesting option to try to learn link state by creating test
  4548. circuits, even when SocksPort is off.
  4549. - Remove unused open circuits when there are too many.
  4550. Changes in version 0.0.2 - 2004-03-19
  4551. - Include strlcpy and strlcat for safer string ops
  4552. - define INADDR_NONE so we compile (but still not run) on solaris
  4553. Changes in version 0.0.2pre27 - 2004-03-14
  4554. o Bugfixes:
  4555. - Allow internal tor networks (we were rejecting internal IPs,
  4556. now we allow them if they're set explicitly).
  4557. - And fix a few endian issues.
  4558. Changes in version 0.0.2pre26 - 2004-03-14
  4559. o New features:
  4560. - If a stream times out after 15s without a connected cell, don't
  4561. try that circuit again: try a new one.
  4562. - Retry streams at most 4 times. Then give up.
  4563. - When a dirserver gets a descriptor from an unknown router, it
  4564. logs its fingerprint (so the dirserver operator can choose to
  4565. accept it even without mail from the server operator).
  4566. - Inform unapproved servers when we reject their descriptors.
  4567. - Make tor build on Windows again. It works as a client, who knows
  4568. about as a server.
  4569. - Clearer instructions in the torrc for how to set up a server.
  4570. - Be more efficient about reading fd's when our global token bucket
  4571. (used for rate limiting) becomes empty.
  4572. o Bugfixes:
  4573. - Stop asserting that computers always go forward in time. It's
  4574. simply not true.
  4575. - When we sent a cell (e.g. destroy) and then marked an OR connection
  4576. expired, we might close it before finishing a flush if the other
  4577. side isn't reading right then.
  4578. - Don't allow dirservers to start if they haven't defined
  4579. RecommendedVersions
  4580. - We were caching transient dns failures. Oops.
  4581. - Prevent servers from publishing an internal IP as their address.
  4582. - Address a strcat vulnerability in circuit.c
  4583. Changes in version 0.0.2pre25 - 2004-03-04
  4584. o New features:
  4585. - Put the OR's IP in its router descriptor, not its fqdn. That way
  4586. we'll stop being stalled by gethostbyname for nodes with flaky dns,
  4587. e.g. poblano.
  4588. o Bugfixes:
  4589. - If the user typed in an address that didn't resolve, the server
  4590. crashed.
  4591. Changes in version 0.0.2pre24 - 2004-03-03
  4592. o Bugfixes:
  4593. - Fix an assertion failure in dns.c, where we were trying to dequeue
  4594. a pending dns resolve even if it wasn't pending
  4595. - Fix a spurious socks5 warning about still trying to write after the
  4596. connection is finished.
  4597. - Hold certain marked_for_close connections open until they're finished
  4598. flushing, rather than losing bytes by closing them too early.
  4599. - Correctly report the reason for ending a stream
  4600. - Remove some duplicate calls to connection_mark_for_close
  4601. - Put switch_id and start_daemon earlier in the boot sequence, so it
  4602. will actually try to chdir() to options.DataDirectory
  4603. - Make 'make test' exit(1) if a test fails; fix some unit tests
  4604. - Make tor fail when you use a config option it doesn't know about,
  4605. rather than warn and continue.
  4606. - Make --version work
  4607. - Bugfixes on the rpm spec file and tor.sh, so it's more up to date
  4608. Changes in version 0.0.2pre23 - 2004-02-29
  4609. o New features:
  4610. - Print a statement when the first circ is finished, so the user
  4611. knows it's working.
  4612. - If a relay cell is unrecognized at the end of the circuit,
  4613. send back a destroy. (So attacks to mutate cells are more
  4614. clearly thwarted.)
  4615. - New config option 'excludenodes' to avoid certain nodes for circuits.
  4616. - When it daemonizes, it chdir's to the DataDirectory rather than "/",
  4617. so you can collect coredumps there.
  4618. o Bugfixes:
  4619. - Fix a bug in tls flushing where sometimes data got wedged and
  4620. didn't flush until more data got sent. Hopefully this bug was
  4621. a big factor in the random delays we were seeing.
  4622. - Make 'connected' cells include the resolved IP, so the client
  4623. dns cache actually gets populated.
  4624. - Disallow changing from ORPort=0 to ORPort>0 on hup.
  4625. - When we time-out on a stream and detach from the circuit, send an
  4626. end cell down it first.
  4627. - Only warn about an unknown router (in exitnodes, entrynodes,
  4628. excludenodes) after we've fetched a directory.
  4629. Changes in version 0.0.2pre22 - 2004-02-26
  4630. o New features:
  4631. - Servers publish less revealing uname information in descriptors.
  4632. - More memory tracking and assertions, to crash more usefully when
  4633. errors happen.
  4634. - If the default torrc isn't there, just use some default defaults.
  4635. Plus provide an internal dirservers file if they don't have one.
  4636. - When the user tries to use Tor as an http proxy, give them an http
  4637. 501 failure explaining that we're a socks proxy.
  4638. - Dump a new router.desc on hup, to help confused people who change
  4639. their exit policies and then wonder why router.desc doesn't reflect
  4640. it.
  4641. - Clean up the generic tor.sh init script that we ship with.
  4642. o Bugfixes:
  4643. - If the exit stream is pending on the resolve, and a destroy arrives,
  4644. then the stream wasn't getting removed from the pending list. I
  4645. think this was the one causing recent server crashes.
  4646. - Use a more robust poll on OSX 10.3, since their poll is flaky.
  4647. - When it couldn't resolve any dirservers, it was useless from then on.
  4648. Now it reloads the RouterFile (or default dirservers) if it has no
  4649. dirservers.
  4650. - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
  4651. many users don't even *have* a /usr/local/sbin/.
  4652. Changes in version 0.0.2pre21 - 2004-02-18
  4653. o New features:
  4654. - There's a ChangeLog file that actually reflects the changelog.
  4655. - There's a 'torify' wrapper script, with an accompanying
  4656. tor-tsocks.conf, that simplifies the process of using tsocks for
  4657. tor. It even has a man page.
  4658. - The tor binary gets installed to sbin rather than bin now.
  4659. - Retry streams where the connected cell hasn't arrived in 15 seconds
  4660. - Clean up exit policy handling -- get the default out of the torrc,
  4661. so we can update it without forcing each server operator to fix
  4662. his/her torrc.
  4663. - Allow imaps and pop3s in default exit policy
  4664. o Bugfixes:
  4665. - Prevent picking middleman nodes as the last node in the circuit
  4666. Changes in version 0.0.2pre20 - 2004-01-30
  4667. o New features:
  4668. - We now have a deb package, and it's in debian unstable. Go to
  4669. it, apt-getters. :)
  4670. - I've split the TotalBandwidth option into BandwidthRate (how many
  4671. bytes per second you want to allow, long-term) and
  4672. BandwidthBurst (how many bytes you will allow at once before the cap
  4673. kicks in). This better token bucket approach lets you, say, set
  4674. BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
  4675. performance while not exceeding your monthly bandwidth quota.
  4676. - Push out a tls record's worth of data once you've got it, rather
  4677. than waiting until you've read everything waiting to be read. This
  4678. may improve performance by pipelining better. We'll see.
  4679. - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
  4680. from failed circuits (if they haven't been connected yet) and attach
  4681. to new ones.
  4682. - Expire old streams that haven't managed to connect. Some day we'll
  4683. have them reattach to new circuits instead.
  4684. o Bugfixes:
  4685. - Fix several memory leaks that were causing servers to become bloated
  4686. after a while.
  4687. - Fix a few very rare assert triggers. A few more remain.
  4688. - Setuid to User _before_ complaining about running as root.
  4689. Changes in version 0.0.2pre19 - 2004-01-07
  4690. o Bugfixes:
  4691. - Fix deadlock condition in dns farm. We were telling a child to die by
  4692. closing the parent's file descriptor to him. But newer children were
  4693. inheriting the open file descriptor from the parent, and since they
  4694. weren't closing it, the socket never closed, so the child never read
  4695. eof, so he never knew to exit. Similarly, dns workers were holding
  4696. open other sockets, leading to all sorts of chaos.
  4697. - New cleaner daemon() code for forking and backgrounding.
  4698. - If you log to a file, it now prints an entry at the top of the
  4699. logfile so you know it's working.
  4700. - The onionskin challenge length was 30 bytes longer than necessary.
  4701. - Started to patch up the spec so it's not quite so out of date.
  4702. Changes in version 0.0.2pre18 - 2004-01-02
  4703. o Bugfixes:
  4704. - Fix endian issues with the 'integrity' field in the relay header.
  4705. - Fix a potential bug where connections in state
  4706. AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
  4707. Changes in version 0.0.2pre17 - 2003-12-30
  4708. o Bugfixes:
  4709. - Made --debuglogfile (or any second log file, actually) work.
  4710. - Resolved an edge case in get_unique_circ_id_by_conn where a smart
  4711. adversary could force us into an infinite loop.
  4712. o Features:
  4713. - Each onionskin handshake now includes a hash of the computed key,
  4714. to prove the server's identity and help perfect forward secrecy.
  4715. - Changed cell size from 256 to 512 bytes (working toward compatibility
  4716. with MorphMix).
  4717. - Changed cell length to 2 bytes, and moved it to the relay header.
  4718. - Implemented end-to-end integrity checking for the payloads of
  4719. relay cells.
  4720. - Separated streamid from 'recognized' (otherwise circuits will get
  4721. messed up when we try to have streams exit from the middle). We
  4722. use the integrity-checking to confirm that a cell is addressed to
  4723. this hop.
  4724. - Randomize the initial circid and streamid values, so an adversary who
  4725. breaks into a node can't learn how many circuits or streams have
  4726. been made so far.
  4727. Changes in version 0.0.2pre16 - 2003-12-14
  4728. o Bugfixes:
  4729. - Fixed a bug that made HUP trigger an assert
  4730. - Fixed a bug where a circuit that immediately failed wasn't being
  4731. counted as a failed circuit in counting retries.
  4732. o Features:
  4733. - Now we close the circuit when we get a truncated cell: otherwise we're
  4734. open to an anonymity attack where a bad node in the path truncates
  4735. the circuit and then we open streams at him.
  4736. - Add port ranges to exit policies
  4737. - Add a conservative default exit policy
  4738. - Warn if you're running tor as root
  4739. - on HUP, retry OR connections and close/rebind listeners
  4740. - options.EntryNodes: try these nodes first when picking the first node
  4741. - options.ExitNodes: if your best choices happen to include any of
  4742. your preferred exit nodes, you choose among just those preferred
  4743. exit nodes.
  4744. - options.ExcludedNodes: nodes that are never picked in path building
  4745. Changes in version 0.0.2pre15 - 2003-12-03
  4746. o Robustness and bugfixes:
  4747. - Sometimes clients would cache incorrect DNS resolves, which would
  4748. really screw things up.
  4749. - An OP that goes offline would slowly leak all its sockets and stop
  4750. working.
  4751. - A wide variety of bugfixes in exit node selection, exit policy
  4752. handling, and processing pending streams when a new circuit is
  4753. established.
  4754. - Pick nodes for a path only from those the directory says are up
  4755. - Choose randomly from all running dirservers, not always the first one
  4756. - Increase allowed http header size for directory fetch.
  4757. - Stop writing to stderr (if we're daemonized it will be closed).
  4758. - Enable -g always, so cores will be more useful to me.
  4759. - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
  4760. o Documentation:
  4761. - Wrote a man page. It lists commonly used options.
  4762. o Configuration:
  4763. - Change default loglevel to warn.
  4764. - Make PidFile default to null rather than littering in your CWD.
  4765. - OnionRouter config option is now obsolete. Instead it just checks
  4766. ORPort>0.
  4767. - Moved to a single unified torrc file for both clients and servers.
  4768. Changes in version 0.0.2pre14 - 2003-11-29
  4769. o Robustness and bugfixes:
  4770. - Force the admin to make the DataDirectory himself
  4771. - to get ownership/permissions right
  4772. - so clients no longer make a DataDirectory and then never use it
  4773. - fix bug where a client who was offline for 45 minutes would never
  4774. pull down a directory again
  4775. - fix (or at least hide really well) the dns assert bug that was
  4776. causing server crashes
  4777. - warnings and improved robustness wrt clockskew for certs
  4778. - use the native daemon(3) to daemonize, when available
  4779. - exit if bind() fails
  4780. - exit if neither socksport nor orport is defined
  4781. - include our own tor_timegm (Win32 doesn't have its own)
  4782. - bugfix for win32 with lots of connections
  4783. - fix minor bias in PRNG
  4784. - make dirserver more robust to corrupt cached directory
  4785. o Documentation:
  4786. - Wrote the design document (woo)
  4787. o Circuit building and exit policies:
  4788. - Circuits no longer try to use nodes that the directory has told them
  4789. are down.
  4790. - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
  4791. bitcounts (18.0.0.0/8).
  4792. - Make AP connections standby for a circuit if no suitable circuit
  4793. exists, rather than failing
  4794. - Circuits choose exit node based on addr/port, exit policies, and
  4795. which AP connections are standing by
  4796. - Bump min pathlen from 2 to 3
  4797. - Relay end cells have a payload to describe why the stream ended.
  4798. - If the stream failed because of exit policy, try again with a new
  4799. circuit.
  4800. - Clients have a dns cache to remember resolved addresses.
  4801. - Notice more quickly when we have no working circuits
  4802. o Configuration:
  4803. - APPort is now called SocksPort
  4804. - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
  4805. where to bind
  4806. - RecommendedVersions is now a config variable rather than
  4807. hardcoded (for dirservers)
  4808. - Reloads config on HUP
  4809. - Usage info on -h or --help
  4810. - If you set User and Group config vars, it'll setu/gid to them.
  4811. Changes in version 0.0.2pre13 - 2003-10-19
  4812. o General stability:
  4813. - SSL_write no longer fails when it returns WANTWRITE and the number
  4814. of bytes in the buf has changed by the next SSL_write call.
  4815. - Fix segfault fetching directory when network is down
  4816. - Fix a variety of minor memory leaks
  4817. - Dirservers reload the fingerprints file on HUP, so I don't have
  4818. to take down the network when I approve a new router
  4819. - Default server config file has explicit Address line to specify fqdn
  4820. o Buffers:
  4821. - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
  4822. - Make listener connections not ever alloc bufs
  4823. o Autoconf improvements:
  4824. - don't clobber an external CFLAGS in ./configure
  4825. - Make install now works
  4826. - create var/lib/tor on make install
  4827. - autocreate a tor.sh initscript to help distribs
  4828. - autocreate the torrc and sample-server-torrc with correct paths
  4829. o Log files and Daemonizing now work:
  4830. - If --DebugLogFile is specified, log to it at -l debug
  4831. - If --LogFile is specified, use it instead of commandline
  4832. - If --RunAsDaemon is set, tor forks and backgrounds on startup