{"id":114374,"date":"2024-03-17T12:25:42","date_gmt":"2024-03-17T10:25:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/opredelenie-seansov-openvpn-v-tranzitnom-trafike"},"modified":"2024-03-17T12:25:42","modified_gmt":"2024-03-17T10:25:44","slug":"opredelenie-seansov-openvpn-v-tranzitnom-trafike","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/opredelenie-seansov-openvpn-v-tranzitnom-trafike","title":{"rendered":"Definition av OpenVPN-sessioner i transittrafik","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>En grupp forskare fr\u00e5n Michigan University har publicerat resultaten av en studie om m\u00f6jligheten att identifiera (VPN Fingerprinting) anslutningar till servrar baserade p\u00e5 OpenVPN vid \u00f6vervakning av transit trafik. Resultatet visade tre s\u00e4tt att identifiera OpenVPN-protokollet bland andra n\u00e4tverkspaket, som kan anv\u00e4ndas i system f\u00f6r trafikinspektion f\u00f6r att blockera virtuella n\u00e4tverk baserade p\u00e5 OpenVPN.      <\/p>\n<p>\u0422\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0432 \u0441\u0435\u0442\u0438 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442-\u043f\u0440\u043e\u0432\u0430\u0439\u0434\u0435\u0440\u0430 Merit, \u043d\u0430\u0441\u0447\u0438\u0442\u044b\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0431\u043e\u043b\u0435\u0435 \u043c\u0438\u043b\u043b\u0438\u043e\u043d\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439, \u043f\u043e\u043a\u0430\u0437\u0430\u043b\u043e \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 85% OpenVPN-\u0441\u0435\u0430\u043d\u0441\u043e\u0432 \u043f\u0440\u0438 \u043d\u0435\u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u043c \u0443\u0440\u043e\u0432\u043d\u0435 \u043b\u043e\u0436\u043d\u044b\u0445 \u0441\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u043d\u0438\u0439. \u0414\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0431\u044b\u043b \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0439, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0432\u043d\u0430\u0447\u0430\u043b\u0435 \u0432 \u043f\u0430\u0441\u0441\u0438\u0432\u043d\u043e\u043c \u0440\u0435\u0436\u0438\u043c\u0435 \u043d\u0430 \u043b\u0435\u0442\u0443 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u043b \u0442\u0440\u0430\u0444\u0438\u043a OpenVPN, \u0430 \u0437\u0430\u0442\u0435\u043c \u0443\u0434\u043e\u0441\u0442\u043e\u0432\u0435\u0440\u044f\u0435\u0442\u0441\u044f \u0432 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e\u0441\u0442\u0438 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0430 \u0447\u0435\u0440\u0435\u0437 \u0430\u043a\u0442\u0438\u0432\u043d\u0443\u044e \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0443 \u0441\u0435\u0440\u0432\u0435\u0440\u0430. \u041d\u0430 \u0441\u043e\u0437\u0434\u0430\u043d\u043d\u044b\u0439 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c\u0438 \u0430\u043d\u0430\u043b\u0438\u0437\u0430\u0442\u043e\u0440 \u0431\u044b\u043b \u043e\u0442\u0437\u0435\u0440\u043a\u0430\u043b\u0438\u0440\u043e\u0432\u0430\u043d \u043f\u043e\u0442\u043e\u043a \u0442\u0440\u0430\u0444\u0438\u043a\u0430, \u0438\u043d\u0442\u0435\u0440\u0441\u0438\u0432\u043d\u043e\u0441\u0442\u044c\u044e \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e 20&#8201;Gbps.       <center><img decoding=\"async\" alt=\"Definition av OpenVPN-sessioner i transittrafik\" src=\"\/wp-content\/uploads\/2024\/03\/93c8725aa3fcf684521b87c8d7caaac4.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>Under experimentet kunde analyseraren framg\u00e5ngsrikt identifiera 1718 av 2000 testade OpenVPN-anslutningar, etablerade av en falsk klient, d\u00e4r 40 olika standardkonfigurationer av OpenVPN anv\u00e4ndes (metoden fungerade framg\u00e5ngsrikt f\u00f6r 39 av 40 konfigurationer). Dessutom uppt\u00e4cktes under de \u00e5tta dagar som experimentet p\u00e5gick 3638 OpenVPN-sessioner i transittrafiken, av vilka 3245 sessioner bekr\u00e4ftades. Det observeras att den \u00f6vre gr\u00e4nsen f\u00f6r falska positiva i den f\u00f6reslagna metoden \u00e4r tre ordningar l\u00e4gre \u00e4n i tidigare f\u00f6reslagna metoder baserade p\u00e5 maskininl\u00e4rning.        <\/p>\n<p>\u041e\u0442\u0434\u0435\u043b\u044c\u043d\u043e \u0431\u044b\u043b\u0430 \u043e\u0446\u0435\u043d\u0435\u043d\u0430 \u0440\u0430\u0431\u043e\u0442\u0430 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u044f \u0442\u0440\u0430\u0444\u0438\u043a\u0430 OpenVPN \u0432 \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0445 \u0441\u0435\u0440\u0432\u0438\u0441\u0430\u0445 &#8212; \u0438\u0437 41 \u043f\u0440\u043e\u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"110\">VPN<\/a>-tj\u00e4nster som anv\u00e4nder metoder f\u00f6r att d\u00f6lja OpenVPN-trafik lyckades trafiken identifieras i 34 fall. Tj\u00e4nster som inte kunde uppt\u00e4ckas anv\u00e4nde, f\u00f6rutom OpenVPN, ytterligare lager f\u00f6r att d\u00f6lja trafiken (t.ex. genom att k\u00f6ra OpenVPN-trafik genom en ytterligare krypterad tunnel). I de flesta av de framg\u00e5ngsrikt identifierade tj\u00e4nsterna anv\u00e4ndes trafikdistorision genom XOR-operation, ytterligare lager av obfuskering utan tillr\u00e4cklig slumpm\u00e4ssig komplettering av trafiken eller f\u00f6rekomsten av obfuskade OpenVPN-tj\u00e4nster p\u00e5 samma <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/server\/dts-dronten\/\"   title=\"servern\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2579\">servern<\/a>.      <\/p>\n<p> \u0417\u0430\u0434\u0435\u0439\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u0441\u043f\u043e\u0441\u043e\u0431\u044b \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u043e\u0441\u043d\u043e\u0432\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u043d\u0430 \u043f\u0440\u0438\u0432\u044f\u0437\u043a\u0435 \u043a \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u043d\u044b\u043c \u0434\u043b\u044f OpenVPN \u0448\u0430\u0431\u043b\u043e\u043d\u0430\u043c \u0432 \u043d\u0435\u0437\u0430\u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043a\u0430\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432, \u0440\u0430\u0437\u043c\u0435\u0440\u0443 ACK-\u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0438 \u043e\u0442\u0432\u0435\u0442\u0430\u043c \u0441\u0435\u0440\u0432\u0435\u0440\u0430. \u0412 \u043f\u0435\u0440\u0432\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435, \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0431\u044a\u0435\u043a\u0442\u0430 \u0434\u043b\u044f \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u043d\u0430 \u0441\u0442\u0430\u0434\u0438\u0438 \u0441\u043e\u0433\u043b\u0430\u0441\u043e\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f  \u043f\u0440\u0438\u0432\u044f\u0437\u043a\u0430 \u043a \u043f\u043e\u043b\u044e &#171;opcode&#187; \u0432 \u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043a\u0435 \u043f\u0430\u043a\u0435\u0442\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u043e\u0435  \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0435\u0442 \u0444\u0438\u043a\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u0432 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442 \u0441\u0442\u0430\u0434\u0438\u0438 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f. \u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044f \u0441\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u0432 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044e \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f opcode \u0432 \u043f\u0435\u0440\u0432\u044b\u0445 N-\u043f\u0430\u043a\u0435\u0442\u0430\u0445 \u043f\u043e\u0442\u043e\u043a\u0430.     <\/p>\n<p>Den andra metoden baseras p\u00e5 att ACK-paket endast anv\u00e4nds i OpenVPN under f\u00f6rhandlingsfasen av anslutningen och dessutom har en specifik storlek. Identifikationen baseras p\u00e5 att ACK-paket av den angivna storleken endast f\u00f6rekommer i specifika delar av sessionen (till exempel \u00e4r det f\u00f6rsta ACK-paketet vanligtvis det tredje paketet med data som \u00f6verf\u00f6rs under sessionen).     <center><img decoding=\"async\" alt=\"Definition av OpenVPN-sessioner i transittrafik\" src=\"\/wp-content\/uploads\/2024\/03\/d601d7c0466a9ca3c58f5984c1387305.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>\u0422\u0440\u0435\u0442\u0438\u0439 \u043c\u0435\u0442\u043e\u0434 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0430\u043a\u0442\u0438\u0432\u043d\u043e\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u043e\u0439 \u0438 \u043e\u0431\u0443\u0441\u043b\u043e\u0432\u043b\u0435\u043d \u0442\u0435\u043c, \u0447\u0442\u043e \u0432 \u043e\u0442\u0432\u0435\u0442 \u043d\u0430 \u0437\u0430\u043f\u0440\u043e\u0441 \u0441\u0431\u0440\u043e\u0441\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0441\u0435\u0440\u0432\u0435\u0440 OpenVPN \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u044f\u0435\u0442  \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0439 RST-\u043f\u0430\u043a\u0435\u0442 (\u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u043d\u0435 \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0440\u0435\u0436\u0438\u043c\u0430 &#171;tls-auth&#187; \u0442\u0430\u043a \u043a\u0430\u043a OpenVPN-\u0441\u0435\u0440\u0432\u0435\u0440 \u043f\u0440\u0438 \u043d\u0451\u043c \u0438\u0433\u043d\u043e\u0440\u0438\u0440\u0443\u0435\u0442 \u0437\u0430\u043f\u0440\u043e\u0441\u044b \u043e\u0442 \u043a\u043b\u0438\u0435\u043d\u0442\u043e\u0432, \u043d\u0435 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0447\u0435\u0440\u0435\u0437 TLS).    <center><img decoding=\"async\" alt=\"Definition av OpenVPN-sessioner i transittrafik\" src=\"\/wp-content\/uploads\/2024\/03\/8a26964bce850fcd60b1cf467d715cf5.png\" style=\"display:block;margin: 0 auto;\" \/><\/center><br \/>\n<br \/>K\u00e4lla: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60795\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u041c\u0438\u0447\u0438\u0433\u0430\u043d\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 (VPN Fingerprinting) \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0439 \u043a \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u043c \u043d\u0430 \u0431\u0430\u0437\u0435 OpenVPN \u043f\u0440\u0438 \u043c\u043e\u043d\u0438\u0442\u043e\u0440\u0438\u043d\u0433\u0435 \u0442\u0440\u0430\u043d\u0437\u0438\u0442\u043d\u043e\u0433\u043e \u0442\u0440\u0430\u0444\u0438\u043a\u0430. \u0412 \u0438\u0442\u043e\u0433\u0435 \u0431\u044b\u043b\u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e \u0442\u0440\u0438 \u0441\u043f\u043e\u0441\u043e\u0431\u0430 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 OpenVPN \u0441\u0440\u0435\u0434\u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432, 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