{"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\/sq\/blog\/novosti-interneta\/opredelenie-seansov-openvpn-v-tranzitnom-trafike","title":{"rendered":"Definimi i seancave OpenVPN n\u00eb trafikun transit","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Nj\u00eb grup hulumtuesish nga Universiteti i Mi\u00e7iganit publikoi rezultatet e nj\u00eb studimi mbi mund\u00ebsin\u00eb e identifikimit (VPN Fingerprinting) t\u00eb lidhjeve me serverat q\u00eb bazohen n\u00eb OpenVPN gjat\u00eb monitorimit t\u00eb trafikut tranzit. Nga ky studim u identifikuan tre metoda identifikimi t\u00eb protokollit OpenVPN n\u00eb mesin e paketave t\u00eb tjera rrjetore q\u00eb mund t\u00eb p\u00ebrdoren n\u00eb sistemet e inspektimit t\u00eb trafikut p\u00ebr t\u00eb bllokuar rrjetet virtuale q\u00eb p\u00ebrdorin OpenVPN. <\/p>\n

Testimi i metodeve t\u00eb propozuara n\u00eb rrjetin e ofruesit t\u00eb internetit Merit, i cili ka m\u00eb shum\u00eb se nj\u00eb milion p\u00ebrdorues, tregoi mund\u00ebsin\u00eb e identifikimit t\u00eb 85% t\u00eb seancave OpenVPN me nj\u00eb nivel t\u00eb ul\u00ebt t\u00eb njoftimeve t\u00eb rreme. P\u00ebr kontroll, u p\u00ebrgatit nj\u00eb veg\u00ebl q\u00eb fillimisht n\u00eb m\u00ebnyr\u00eb pasive, n\u00eb koh\u00eb reale, identifikonte trafikun OpenVPN dhe m\u00eb pas konfirmonte sakt\u00ebsin\u00eb e rezultatit p\u00ebrmes nj\u00eb verifikimi aktiv t\u00eb serverit. N\u00eb analizatorin e krijuar nga hulumtuesit, u pasqyrua nj\u00eb fluks trafiku me intensitet prej rreth 20 Gbps.

\"Definimi<\/center> <\/p>\n

Gjat\u00eb eksperimentit, analizeri arriti t\u00eb p\u00ebrcaktoj\u00eb me sukses 1718 nga 2000 lidhjet testuese t\u00eb OpenVPN, t\u00eb vendosura nga nj\u00eb klient t\u00eb rrem\u00eb, p\u00ebr t\u00eb cilin u p\u00ebrdor\u00ebn 40 konfigurime t\u00eb ndryshme tipike t\u00eb OpenVPN (metoda funksionoi me sukses p\u00ebr 39 nga 40 konfigurime). P\u00ebr m\u00eb tep\u00ebr, gjat\u00eb tet\u00eb dit\u00ebve t\u00eb zhvillimit t\u00eb eksperimentit n\u00eb trafikun tranzit u identifikuan 3638 seanca OpenVPN, prej t\u00eb cilave u konfirmuan 3245 seanca. Vlen t\u00eb theksohet se kufiri i sip\u00ebrm i gabimeve false t\u00eb metod\u00ebs s\u00eb propozuar \u00ebsht\u00eb tre her\u00eb m\u00eb i ul\u00ebt se metoda e m\u00ebparshme, e cila bazohej n\u00eb p\u00ebrdorimin e m\u00ebsimit t\u00eb makineris\u00eb. <\/p>\n

Ve\u00e7mas u vler\u00ebsua funksionimi i metodave t\u00eb mbrojtjes nga ndjekja e trafikut OpenVPN n\u00eb sh\u00ebrbimet komerciale \u2014 nga 41 t\u00eb testuar. VPN<\/a>Metodat e p\u00ebrdorura p\u00ebr identifikimin bazohen n\u00eb lidhjen me modele specifike p\u00ebr OpenVPN n\u00eb kokat e paketave t\u00eb paenkriptuara, madh\u00ebsin\u00eb e paketave ACK dhe p\u00ebrgjigjet e serverit. N\u00eb rastin e par\u00eb, si objekt p\u00ebr identifikim n\u00eb faz\u00ebn e negociat\u00ebs s\u00eb lidhjes mund t\u00eb p\u00ebrdoret lidhja me fush\u00ebn \"opcode\" n\u00eb kok\u00ebn e paketave, e cila merr nj\u00eb gam\u00eb fikse vlerash dhe ndryshon n\u00eb nj\u00eb m\u00ebnyr\u00eb t\u00eb caktuar n\u00eb p\u00ebrputhje me faz\u00ebn e vendosjes s\u00eb lidhjes. Identifikimi q\u00ebndron n\u00eb p\u00ebrcaktimin e nj\u00eb sekuence t\u00eb caktuar t\u00eb ndryshimeve t\u00eb opcode n\u00eb paketa t\u00eb para N t\u00eb fluksit. serveri<\/a>. <\/p>\n

Metodat e angazhuara p\u00ebr identifikim bazohen n\u00eb lidhjen me modele specifike p\u00ebr OpenVPN n\u00eb titujt e pakove t\u00eb pa\u0161ifruara, madh\u00ebsin\u00eb e ACK-pakove dhe p\u00ebrgjigjet e serverit. N\u00eb rastin e par\u00eb, si objekt p\u00ebr identifikim n\u00eb faz\u00ebn e negociatave t\u00eb lidhjes mund t\u00eb p\u00ebrdoret lidhja me fush\u00ebn \u00abopcode\u00bb n\u00eb titullin e pakove, e cila pranon nj\u00eb gam\u00eb t\u00eb caktuar vlerash dhe ndryshon n\u00eb m\u00ebnyr\u00eb t\u00eb caktuar n\u00eb var\u00ebsi t\u00eb faz\u00ebs s\u00eb krijimit t\u00eb lidhjes. Identifikimi p\u00ebrfshin identifikimin e nj\u00eb sekuence t\u00eb caktuar t\u00eb ndryshimit t\u00eb opcode n\u00eb pakot e para N t\u00eb fluksit. <\/p>\n

Metoda e tret\u00eb \u00ebsht\u00eb nj\u00eb verifikim aktiv dhe bazohet n\u00eb faktin se, n\u00eb p\u00ebrgjigje t\u00eb nj\u00eb k\u00ebrkese p\u00ebr t\u00eb rikthyer lidhjen, serveri OpenVPN d\u00ebrgon nj\u00eb paket\u00eb specifike RST (kontrolli nuk funksionon kur p\u00ebrdoret moda \"tls-auth\", pasi serveri OpenVPN n\u00eb k\u00ebt\u00eb rast injoron k\u00ebrkesat nga klient\u00ebt q\u00eb nuk jan\u00eb autentikuar p\u00ebrmes TLS).

\"Definimi<\/center> <\/p>\n

Metoda e tret\u00eb \u00ebsht\u00eb nj\u00eb verifikim aktiv dhe bazohet n\u00eb faktin se n\u00eb p\u00ebrgjigje ndaj nj\u00eb k\u00ebrkese p\u00ebr t\u00eb riaktivizuar lidhjen, serveri OpenVPN d\u00ebrgon nj\u00eb paket\u00eb RST t\u00eb caktuar (verifikimi nuk funksionon n\u00ebse p\u00ebrdoret moda \u00abtls-auth\u00bb, pasi serveri OpenVPN e injoron k\u00ebrkesat nga klient\u00ebt q\u00eb nuk jan\u00eb autentikuar n\u00ebp\u00ebrmjet TLS).

\"Definimi<\/center>
\n
Burimi: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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