{"id":34775,"date":"2019-10-31T22:00:18","date_gmt":"2019-10-31T19:00:18","guid":{"rendered":"https:\/\/prohoster.info\/blog\/eksperiment-kak-zamaskirovat-ispolzovanie-tor-dlya-obhoda-blokirovok\/"},"modified":"2019-10-31T22:00:18","modified_gmt":"2019-10-31T19:00:18","slug":"eksperiment-kak-zamaskirovat-ispolzovanie-tor-dlya-obhoda-blokirovok","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/eksperiment-kak-zamaskirovat-ispolzovanie-tor-dlya-obhoda-blokirovok","title":{"rendered":"Eksperiment: Kuidas maskeerida Tor'i kasutust plokiahelate \u00fcletamiseks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infatica\/blog\/454002\/\"><img decoding=\"async\" alt=\"Eksperiment: Kuidas maskeerida Tor&#039;i kasutust plokiahelate \u00fcletamiseks\" src=\"\/wp-content\/uploads\/2019\/05\/35921a936c3b9237cb346e52899dfdc8.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p>Internetisensor hakkab olema \u00fcha olulisem probleem \u00fcle kogu maailma. See toob kaasa relvastumisv\u00f5idujooksu \u2013 riigiasutused ja erasektor eri riikides p\u00fc\u00fcavad blokeerida erinevat sisu ning v\u00f5idelda selliste piirangute \u00fcletamise vahenditega, samas kui arendajad ja teadlased p\u00fc\u00fcavad luua t\u00f5husaid t\u00f6\u00f6riistu tsensuuri vastu. <\/p>\n<p>Carnegie Melloni, Stanfordi \u00dclikooli ja SRI Internationali teadlased viisid l\u00e4bi <noindex><a rel=\"nofollow\" href=\"https:\/\/www.frankwang.org\/files\/papers\/ccs2012.pdf\">katse<\/a><\/noindex>, mille k\u00e4igus t\u00f6\u00f6tati v\u00e4lja spetsiaalne teenus Tor'i kasutamise maskeerimiseks \u2013 \u00fcks populaarsemaid t\u00f6\u00f6riistu blokeeringute \u00fcletamiseks. Meie toome teieni jutustuse teadlaste tehtud t\u00f6\u00f6st.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Tor blokeeringute vastu<\/h2>\n<p>\nTor tagab kasutajate anon\u00fc\u00fcmsust, kasutades spetsiaalseid erinevaid ristmikke \u2013 vaheserverite vahel kasutaja ja soovitud saidi vahel. Tavaliselt asub kasutaja ja saidi vahel mitu ristmikku, millest iga\u00fcks suudab dekr\u00fcpteerida vaid v\u00e4ikese hulga andmeid edastatavas paketis \u2013 piisavalt, et teada j\u00e4rgmise punkti ahelas ja saata see sinna. Seet\u00f5ttu, isegi kui ahelasse lisatakse r\u00ebleid, mida kontrollivad kurjategijad v\u00f5i tsensorid, ei \u00f5nnestu neil teada saada esimest adressaati ega sihtkohta. <\/p>\n<p>T\u00f6\u00f6riistana tsensuuri vastu toimib Tor t\u00f5husalt, kuid tsensoritel on endiselt v\u00f5imalus seda t\u00e4ielikult blokeerida. Iraan ja Hiina on teinud edukaid blokeerimiskampaaniaid. Neil on \u00f5nnestunud tuvastada Tor-i liiklus, skaneerides TLS k\u00e4sitlemisi ja muid Tor-i tunnusjooni. <\/p>\n<p>Hiljem suutsid arendajad s\u00fcsteemi kohandada takistuste \u00fcletamiseks. Tsensuurid vastasid HTTPS-\u00fchenduste blokeerimisega paljudele saitidele, sealhulgas Torile. Projekti arendajad l\u00f5id programmi obfsproxy, mis kr\u00fcpteerib liiklust t\u00e4iendavalt. See v\u00f5istlus kestab pidevalt.<\/p>\n<h2>Eksperimendi algandmed<\/h2>\n<p>\nUurijad otsustasid v\u00e4lja t\u00f6\u00f6tada t\u00f6\u00f6riista, mis v\u00f5imaldaks maskeerida Tor'i kasutamise, et muuta selle rakendamine v\u00f5imalikuks ka piirkondades, kus s\u00fcsteem on t\u00e4ielikult blokeeritud. <\/p>\n<ul>\n<li>V\u00f5ttes aluseks teadlaste tehtud eeldused, esitasid nad j\u00e4rgmised:<\/li>\n<li>Tsensuur kontrollib isoleeritud sisemist v\u00f5rguosa, mis on \u00fchendatud v\u00e4listest tsenseerimata interneti kohtadest.<\/li>\n<li>Blokeeringutega tegelevad asutused kontrollivad kogu v\u00f5rgu infrastruktuuri tsenseeritavas v\u00f5rguosas, kuid mitte l\u00f5ppkasutajate arvutites olevaid tarkvarasid. <\/li>\n<li>Tsensuur p\u00fc\u00fcab takistada kasutajatel ligip\u00e4\u00e4su soovimatutele materjalidele, eeldades, et k\u00f5ik sellised materjalid asuvad kontrollitud v\u00f5rguosa v\u00e4lises serveris. <\/li>\n<li>Selle segmenti piires olevad ruuterid anal\u00fc\u00fcsivad k\u00f5ikide pakettide dekr\u00fcpteerimata andmeid, et blokeerida soovimatu sisu ja v\u00e4ltida vastavaid pakette perimeetri sissep\u00e4\u00e4sust.<\/li>\n<li>K\u00f5ik Tor-\u00fclekanded asuvad perimeetri v\u00e4lispinnal. <\/li>\n<\/ul>\n<p><\/p>\n<h2>Kuidas see toimib<\/h2>\n<p>\nTor kasutamise maskeerimiseks l\u00f5id teadlased t\u00f6\u00f6riista StegoTorus. Selle peamine \u00fclesanne on parandada Tor'i v\u00f5imet vastupidada automatiseeritud protokolli anal\u00fc\u00fcsile. T\u00f6\u00f6riist paikneb kliendi ja esimese \u00fclekande vahel ning kasutab oma kr\u00fcptimisprotokolli ja steganograafia mooduleid, et raskendada Tor-i liikluse tuvastamist.<\/p>\n<p>Esimesena asub t\u00f6\u00f6le moodul nimega chopper \u2013 see muudab liikluse erineva pikkusega plokkide j\u00e4rjekorraks, mis saadetakse edasi mittej\u00e4rjekorras. <\/p>\n<p><img decoding=\"async\" alt=\"Eksperiment: Kuidas maskeerida Tor&#039;i kasutust plokiahelate \u00fcletamiseks\" src=\"\/wp-content\/uploads\/2019\/05\/f229ce95f4ed0513d091a43d6d868850.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAndmed kr\u00fcpteeritakse AES-i GCM-re\u017eiimis. Bloki p\u00e4is sisaldab 32-bitist j\u00e4rjestuse numbrit, kahte pikkuse v\u00e4lja (d ja p) \u2013 need t\u00e4histavad andmete mahtu, erilist v\u00e4lja F ja 56-bitist kontrollv\u00e4li, mille v\u00e4\u00e4rtus peab olema null. Minimaalne bloki pikkus on 32 baiti ja maksimaalne 217+32 baiti. Pikkust kontrollivad steganograafia moodulid. <\/p>\n<p>\u00dchenduse loomisel on esimesed mitmed biteid infot handshake-s\u00f5num, millega server m\u00f5istab, kas tegemist on juba olemasoleva v\u00f5i uue \u00fchendusega. Kui \u00fchendus kuulub uuele lingile, siis vastab server handshake'iga ning iga osaline vahetuses eraldab sellest sessiooniv\u00f5tmed. Lisaks sellele on s\u00fcsteemis rakendatud rekeying-mehhanism \u2013 see sarnaneb sessiooniv\u00f5tme eraldamisega, kuid handshake-s\u00f5numite asemel kasutatakse blokke. See mehhanism muudab j\u00e4rjestuse numbri, kuid ei puutu lingi ID-sse. <\/p>\n<p>Kui m\u00f5lemad andmevahetuse osalised on saatnud ja saanud blokki fin, suletakse link. Replay-r\u00fcnnakute v\u00f5i bloki edastamise viivituste kaitsmiseks peavad m\u00f5lemad osalised m\u00e4letama ID-d teatud aja jooksul p\u00e4rast sulgemist. <\/p>\n<p>Sisseehitatud steganograafia moodul peidab Tor'i liiklust p2p-protokolli sisse \u2013 sarnaselt Skype'i t\u00f6\u00f6le kaitstud VoIP-kommunikatsioonide puhul. HTTP-steganograafia moodul simuleerib kr\u00fcpteerimata HTTP-liiklust. S\u00fcsteem j\u00e4ljendab reaalset kasutajat tavalise brauseriga. <\/p>\n<h2>R\u00fcnnakute suhtes vastupidavus<\/h2>\n<p>\nKuna uurijad soovisid kontrollida, kui t\u00f5husalt suurendab pakutud meetod Tor'i efektiivsust, arendasid nad v\u00e4lja kahte t\u00fc\u00fcpi r\u00fcnnakud. <\/p>\n<p>Esimene neist seisneb Tor'i voogude eristamises TCP-voogudest p\u00f5hinedes Tor'i protokolli p\u00f5hijoontele \u2013 just seda meetodit kasutas Hiina valitsuse s\u00fcsteemi blokeerimiseks. Teine r\u00fcnnak seisneb juba tuntud Tor'i voogude uurimises, et saada teavet selle kohta, milliseid saite kasutaja k\u00fclastas. <\/p>\n<p>Uurijad kinnitasid r\u00fcnnaku esimest t\u00fc\u00fcpi t\u00f5husust \"vanilla Tor\" vastu \u2013 selleks kogusid nad k\u00fclastatavuste j\u00e4lgi top-10 Alexa.com saitidest kaksk\u00fcmmend korda l\u00e4bi tavalise Tor, obfsproxy ja StegoTorus koos HTTP-steganograafia mooduliga. V\u00f5rdluseks kasutati CAIDA andmestikku, kus andmed ports 80 \u2013 peaaegu k\u00f5ik need on HTTP-\u00fchendused.<\/p>\n<p>Eksperiment n\u00e4itas, et tavalist Tor'i on suhteliselt lihtne tuvastada. Tor protokoll on liiga spetsiifiline ning sellel on mitmeid omadusi, mis on kergesti tuvastatavad \u2013 n\u00e4iteks, kui seda kasutatakse, kestavad TCP-\u00fchendused 20-30 sekundit. Obfsproxy t\u00f6\u00f6riist ei varja ka neid ilmselgeid aspekti peaaegu \u00fcldse. StegoTorus genereerib aga liiklust, mis on palju l\u00e4hemal CAIDA viitele.<\/p>\n<p><img decoding=\"async\" alt=\"Eksperiment: Kuidas maskeerida Tor&#039;i kasutust plokiahelate \u00fcletamiseks\" src=\"\/wp-content\/uploads\/2019\/05\/bc75182d731dc854d96d8041d3a2d494.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nK\u00fclastatud veebisaitide paljastamise r\u00fcnnaku korral v\u00f5rdsustasid teadlased t\u00f5en\u00e4osuse, et selline andmete avalikustamine juhtub \"vanilla Tor\" puhul ja nende lahenduses StegoTorus. Hindamiseks kasutati skaalat <noindex><a rel=\"nofollow\" href=\"http:\/\/fastml.com\/what-you-wanted-to-know-about-auc\/\">AUC<\/a><\/noindex> (Area Under Curve). Anal\u00fc\u00fcsi tulemuste p\u00f5hjal selgus, et tavalise Tor'i puhul, ilma lisakaitseta, on k\u00fclastatud veebisaitide andmete avalikustamise t\u00f5en\u00e4osus m\u00e4rkimisv\u00e4\u00e4rselt k\u00f5rgem.<\/p>\n<p><img decoding=\"async\" alt=\"Eksperiment: Kuidas maskeerida Tor&#039;i kasutust plokiahelate \u00fcletamiseks\" src=\"\/wp-content\/uploads\/2019\/05\/74dc8cc047ef7a38d7ae6947e23e8aa9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h2>Kokkuv\u00f5te<\/h2>\n<p>\nRiigiv\u00f5imude ja veebitsensuuri \u00fcletamise s\u00fcsteemide arendajate vastasseis n\u00e4itab, et t\u00f5husad v\u00f5ivad olla vaid kompleksed kaitsemeetmed. Ainult \u00fche t\u00f6\u00f6riista kasutamine ei saa garanteerida juurdep\u00e4\u00e4su vajalikele andmetele ega seda, et teave blokeeringute \u00fcletamise kohta ei saaks sensuuriv\u00f5imudele teada. <\/p>\n<p>Seet\u00f5ttu on oluline, et k\u00f5ikide privaatsuse ja sisu juurde p\u00e4\u00e4semise tagamise t\u00f6\u00f6riistade kasutamisel meeles pidada, et ideaalseid lahendusi ei ole, ja v\u00f5imalusel kombineerida erinevaid meetodeid maksimaalse t\u00f5hususe saavutamiseks.<\/p>\n<h2>Kasulikud lingid ja materjalid <noindex><a rel=\"nofollow\" href=\"https:\/\/infatica.io\">Infatica<\/a><\/noindex>:<\/h2>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infatica\/blog\/453168\/\">Uuring: blokeeringutele vastupidava proxy-teenuse loomine m\u00e4nguteooria p\u00f5hjal<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infatica\/blog\/452438\/\">Ajalugu tsensuuriga v\u00f5itlemisest: kuidas toimib MIT ja Stanfordi teadlaste loodud flash proxy meetod<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infatica\/blog\/451832\/\">Kuidas m\u00f5ista, millal proksid valetavad: v\u00f5rguprokside f\u00fc\u00fcsiliste asukohtade verifitseerimine aktiivse geolokatsiooni algoritmiga<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infatica\/blog\/452334\/\">Kuidas internetis varjata oma kohta: v\u00f5rdleme serverip\u00f5hiseid ja residentse proksi<\/a><\/noindex><\/li>\n<\/ul>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infatica\/blog\/454002\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0426\u0435\u043d\u0437\u0443\u0440\u0430 \u0432 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0435 \u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u0441\u044f \u0432\u0441\u0435 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\u0431\u043e\u0440\u044e\u0442\u0441\u044f \u0441\u043e \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430\u043c\u0438 \u043e\u0431\u0445\u043e\u0434\u0430 \u0442\u0430\u043a\u0438\u0445 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0439, \u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0438 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0441\u0442\u0440\u0435\u043c\u044f\u0442\u0441\u044f \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u044b\u0435 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u044b \u0431\u043e\u0440\u044c\u0431\u044b \u0441 \u0446\u0435\u043d\u0437\u0443\u0440\u043e\u0439. \u0423\u0447\u0435\u043d\u044b\u0435 \u0438\u0437 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u043e\u0432 Carnegie Mellon, \u0421\u0442\u0435\u043d\u0444\u043e\u0440\u0434\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":26200,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-34775","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0426\u0435\u043d\u0437\u0443\u0440\u0430 \u0432 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0435 \u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u0441\u044f \u0432\u0441\u0435 \u0431\u043e\u043b\u0435\u0435 \u0432\u0430\u0436\u043d\u043e\u0439 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u043e\u0439 \u0432\u043e \u0432\u0441\u0435\u043c \u043c\u0438\u0440\u0435. 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