{"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\/it\/blog\/novosti-interneta\/opredelenie-seansov-openvpn-v-tranzitnom-trafike","title":{"rendered":"Definizione delle sessioni OpenVPN nel traffico di transito","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Un gruppo di ricercatori dell'Universit\u00e0 del Michigan ha pubblicato i risultati di uno studio sulla possibilit\u00e0 di identificare le connessioni ai server basati su OpenVPN mediante VPN Fingerprinting durante il monitoraggio del traffico di transito. Sono stati identificati tre metodi per riconoscere il protocollo OpenVPN tra altri pacchetti di rete, utilizzabili in sistemi di ispezione del traffico per bloccare le reti virtuali basate su OpenVPN.      <\/p>\n<p>Il test dei metodi proposti nella rete del provider internet Merit, con oltre un milione di utenti, ha dimostrato la possibilit\u00e0 di identificare l'85% delle sessioni OpenVPN con un basso livello di falsi positivi. Per la verifica \u00e8 stato sviluppato un toolkit che inizialmente in modalit\u00e0 passiva identificava il traffico OpenVPN in tempo reale e successivamente validava la correttezza del risultato tramite un controllo attivo del server. Il traffico \u00e8 stato duplicato su un analizzatore creato dai ricercatori, con un'intensit\u00e0 di circa 20 Gbps.       <center><img decoding=\"async\" alt=\"Definizione delle sessioni OpenVPN nel traffico di transito\" src=\"\/wp-content\/uploads\/2024\/03\/93c8725aa3fcf684521b87c8d7caaac4.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>Durante l'esperimento, l'analizzatore \u00e8 riuscito a identificare con successo 1718 di 2000 connessioni OpenVPN di test impostate da un cliente fittizio, utilizzando 40 diverse configurazioni standard di OpenVPN (il metodo ha funzionato con successo per 39 su 40 configurazioni). Inoltre, nei sette giorni dell'esperimento, sono stati rilevati 3638 sessioni OpenVPN nel traffico di transito, di cui 3245 sono state confermate. Si nota che il limite superiore dei falsi positivi nel metodo proposto \u00e8 tre ordini di grandezza inferiore rispetto ai metodi precedentemente suggeriti, basati su tecniche di apprendimento automatico.        <\/p>\n<p>\u00c8 stata inoltre valutata l'efficacia dei metodi di protezione contro il tracciamento del traffico OpenVPN nei servizi commerciali - su 41 testati. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"110\">VPN<\/a>-servizio che utilizza metodi di occultamento del traffico OpenVPN, il traffico \u00e8 stato identificato in 34 casi. I servizi che non sono stati rilevati, oltre a OpenVPN, utilizzavano strati aggiuntivi per mascherare il traffico (ad esempio, instradando il traffico OpenVPN attraverso un ulteriore tunnel crittografato). Nella maggior parte dei servizi identificati con successo veniva utilizzata la distorsione del traffico mediante operazioni XOR, strati di offuscamento aggiuntivi senza un adeguato riempimento casuale del traffico o la presenza di servizi OpenVPN non offuscati sulla stessa <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-dronten\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2579\">server<\/a>.      <\/p>\n<p> I metodi di identificazione utilizzati si basano sulla correlazione con schemi specifici di OpenVPN nei pacchetti di intestazione non crittografati, sulla dimensione dei pacchetti ACK e sulle risposte del server. Nel primo caso, come oggetto di identificazione nella fase di negoziazione della connessione pu\u00f2 essere utilizzata la correlazione con il campo \u2018opcode\u2019 nell'intestazione dei pacchetti, il quale assume un intervallo fisso di valori e cambia in modo specifico a seconda della fase di stabilimento della connessione. L'identificazione si riduce all'individuazione di una certa sequenza di variazione dell'opcode nei primi N pacchetti del flusso.     <\/p>\n<p>Il secondo metodo si basa sul fatto che i pacchetti ACK vengono utilizzati in OpenVPN solo nella fase di negoziazione della connessione e hanno una dimensione specifica. L'identificazione si basa sul fatto che i pacchetti ACK di dimensioni specifiche si trovano solo in determinate parti della sessione (ad esempio, in OpenVPN, il primo pacchetto ACK \u00e8 di solito il terzo pacchetto con i dati trasmessi nella sessione).     <center><img decoding=\"async\" alt=\"Definizione delle sessioni OpenVPN nel traffico di transito\" src=\"\/wp-content\/uploads\/2024\/03\/d601d7c0466a9ca3c58f5984c1387305.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>Il terzo metodo \u00e8 un controllo attivo ed \u00e8 dovuto al fatto che in risposta a una richiesta di reset della connessione, il server OpenVPN invia un pacchetto RST specifico (il controllo non funziona quando si utilizza la modalit\u00e0 \u2018tls-auth\u2019 poich\u00e9 il server OpenVPN ignora le richieste da parte dei client non autenticati tramite TLS).    <center><img decoding=\"async\" alt=\"Definizione delle sessioni OpenVPN nel traffico di transito\" src=\"\/wp-content\/uploads\/2024\/03\/8a26964bce850fcd60b1cf467d715cf5.png\" style=\"display:block;margin: 0 auto;\" \/><\/center><br \/>\n<br \/>Fonte: <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, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0433\u0443\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0438\u043d\u0441\u043f\u0435\u043a\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0442\u0440\u0430\u0444\u0438\u043a\u0430 \u0434\u043b\u044f \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u0441\u0435\u0442\u0435\u0439 \u043d\u0430 \u0431\u0430\u0437\u0435 OpenVPN. \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 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":114375,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-114374","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 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identificare le connessioni ai server basati su OpenVPN tramite il monitoraggio del traffico transitario. Sono stati identificati tre modi per riconoscere il protocollo OpenVPN tra gli altri pacchetti di rete, che possono essere utilizzati nei sistemi di ispezione del traffico per bloccare le reti virtuali basate su OpenVPN. 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