{"id":34402,"date":"2019-10-31T21:58:08","date_gmt":"2019-10-31T18:58:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/osobennosti-nastrojki-dpi\/"},"modified":"2019-10-31T21:58:08","modified_gmt":"2019-10-31T18:58:08","slug":"osobennosti-nastrojki-dpi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/osobennosti-nastrojki-dpi","title":{"rendered":"Caracteristicile configur\u0103rii DPI","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Aceast\u0103 articol nu examineaz\u0103 configurarea complet\u0103 a DPI \u0219i valoarea \u0219tiin\u021bific\u0103 a textului este minim\u0103. \u00cens\u0103, descrie o metod\u0103 simpl\u0103 de a ocoli DPI, care nu a fost considerat\u0103 de multe companii.<\/p>\n<p><img decoding=\"async\" alt=\"Caracteristicile configur\u0103rii DPI\" src=\"\/wp-content\/uploads\/2019\/05\/5fbb9d8c80da69f6d0058871953a095f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<i>Avertisment nr. 1: acest articol are un caracter investigativ, nu \u00eencurajeaz\u0103 pe nimeni s\u0103 \u00eentreprind\u0103 ac\u021biuni sau s\u0103 utilizeze informa\u021biile. Ideea se bazeaz\u0103 pe experien\u021ba personal\u0103, iar orice asem\u0103n\u0103ri sunt \u00eent\u00e2mpl\u0103toare.<\/i><\/p>\n<p><i>Avertisment nr. 2: articolul nu dezv\u0103luie secretele Atlantidei, c\u0103utarea Sf\u00e2ntului Graal sau alte enigme ale universului, \u00eentregul material fiind \u00een acces liber \u0219i disponibil, posibil descris anterior pe Habr. (nu am g\u0103sit, apreciez un link)<\/i><\/p>\n<p>Pentru cei care au citit avertismentele, s\u0103 \u00eencepem.<\/p>\n<h3>Ce este DPI?<\/h3>\n<p>\nDPI sau Deep Packet Inspection este o tehnologie de colectare a datelor statistice, verificare \u0219i filtrare a pachetelor de re\u021bea, analiz\u00e2nd nu doar anteturile pachetelor, ci \u0219i con\u021binutul complet al traficului la nivelurile modelului OSI de la al doilea \u00een sus, permi\u021b\u00e2nd detectarea \u0219i blocarea viru\u0219ilor, filtrarea informa\u021biilor care nu \u00eendeplinesc criteriile specificate.<\/p>\n<p>Exist\u0103 dou\u0103 tipuri de conectare DPI, care sunt descrise <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/users\/valdikss\/\" class=\"user_link\">ValdikSS<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/ValdikSS\/blockcheck\/wiki\/%D0%A2%D0%B8%D0%BF%D1%8B-DPI\">pe github<\/a><\/noindex>:<\/p>\n<blockquote><p><b>DPI pasiv <\/b><\/p>\n<p>DPI conectat \u00een re\u021beaua furnizorului \u00een paralel (nu \u00een serie) fie printr-un splitter optic pasiv, fie prin utilizarea mirror-ului traficului rezultat de utilizatori. Aceast\u0103 conectare nu \u00eencetine\u0219te viteza de func\u021bionare a re\u021belei furnizorului \u00een cazul unei performan\u021be insuficiente a DPI, motiv pentru care este utilizat\u0103 de marii furnizori. DPI cu acest tip de conectare poate doar detecta o tentativ\u0103 de a accesa con\u021binut interzis, dar nu o poate opri. Pentru a ocoli aceast\u0103 limitare \u0219i a bloca accesul la un site interzis, DPI trimite utilizatorului care solicit\u0103 un URL blocat un pachet HTTP special formulat cu redirec\u021bionare c\u0103tre o pagin\u0103 de \u021bepu\u0219\u0103 a furnizorului, de parc\u0103 un astfel de r\u0103spuns ar fi fost trimis de resursa solicitat\u0103 (falsific\u00e2nd adresa IP a expeditorului \u0219i secven\u021ba TCP). Av\u00e2nd \u00een vedere c\u0103 DPI este situat fizic mai aproape de utilizator dec\u00e2t site-ul solicitat, r\u0103spunsul falsificat ajunge la dispozitivul utilizatorului mai repede dec\u00e2t r\u0103spunsul real de la site.<\/p>\n<p><b>DPI activ<\/b><\/p>\n<p>DPI activ \u2014 DPI conectat la re\u021beaua furnizorului \u00eentr-un mod obi\u0219nuit, la fel ca orice alt dispozitiv de re\u021bea. Furnizorul configureaz\u0103 rutarea astfel \u00eenc\u00e2t DPI s\u0103 primeasc\u0103 trafic de la utilizatori c\u0103tre IP-urile sau domeniile blocate, iar DPI ia decizia de a permite sau bloca traficul. DPI activ poate verifica at\u00e2t traficul de ie\u0219ire, c\u00e2t \u0219i cel de intrare, totu\u0219i, dac\u0103 furnizorul aplic\u0103 DPI doar pentru a bloca site-uri din registru, de obicei, este configurat pentru a verifica doar traficul de ie\u0219ire.<\/p><\/blockquote>\n<p>\nTipul de conectare influen\u021beaz\u0103 nu doar eficien\u021ba bloc\u0103rii traficului, ci \u0219i sarcina pe DPI, prin urmare exist\u0103 posibilitatea de a nu verifica tot traficul, ci doar un anumit tip:<\/p>\n<blockquote><p><b>DPI \u201eobi\u0219nuit\u201d<\/b><\/p>\n<p>Prin \u201eDPI obi\u0219nuit\u201d se \u00een\u021belege un DPI care filtreaz\u0103 un anumit tip de trafic doar pe cele mai comune porturi pentru acest tip. De exemplu, \u201eDPI obi\u0219nuit\u201d identific\u0103 \u0219i blocheaz\u0103 traficul HTTP interzis doar pe portul 80, iar traficul HTTPS pe portul 443. Acest tip de DPI nu va urm\u0103ri con\u021binutul interzis dac\u0103 trimite\u021bi o cerere cu un URL blocat pe un IP neblocat sau pe un port neobi\u0219nuit.<\/p>\n<p><b>DPI \u201ecomplet\u201d<\/b><\/p>\n<p>Spre deosebire de DPI \u201eobi\u0219nuit\u201d, acest tip de DPI clasific\u0103 traficul indiferent de IP \u0219i port. Astfel, site-urile blocate nu vor fi accesibile, chiar dac\u0103 utiliza\u021bi un server proxy pe un port complet diferit \u0219i pe un IP neblocat.<\/p><\/blockquote>\n<p><\/p>\n<h3>Utilizarea DPI<\/h3>\n<p>\nPentru a nu reduce viteza de transfer a datelor, este necesar s\u0103 se utilizeze DPI \u201eobi\u0219nuit\u201d pasiv, care permite blocarea eficient\u0103 a oric\u0103ror resurse; \u00een mod implicit, configura\u021bia arat\u0103 astfel:<\/p>\n<ul>\n<li>HTTP filtreaz\u0103 doar pe portul 80<\/li>\n<li>HTTPS doar pe portul 443<\/li>\n<li>BitTorrent doar pe porturile 6881-6889<\/li>\n<\/ul>\n<p>\nDar problemele \u00eencep atunci c\u00e2nd <b>resursa va folosi un alt port pentru a nu pierde utilizatorii<\/b>, atunci va trebui s\u0103 verifica\u021bi fiecare pachet; un exemplu poate fi adus:<\/p>\n<ul>\n<li>HTTP func\u021bioneaz\u0103 pe porturile 80 \u0219i 8080<\/li>\n<li>HTTPS pe porturile 443 \u0219i 8443<\/li>\n<li>BitTorrent pe orice alt\u0103 gam\u0103<\/li>\n<\/ul>\n<p>\nDin aceast\u0103 cauz\u0103, va trebui fie s\u0103 trece\u021bi la DPI \u201eactiv\u201d, fie s\u0103 utiliza\u021bi blocarea prin intermediul unui server DNS suplimentar.<\/p>\n<h3>Blocarea prin DNS<\/h3>\n<p>\nUna dintre metodele de blocare a accesului la resurse este interceptarea cererilor DNS cu ajutorul unui server DNS local \u0219i returnarea utilizatorului a unei adrese IP de \u201eplaceholder\u201d, nu a resursei solicitate. \u00cens\u0103, aceasta nu garanteaz\u0103 un rezultat sigur, deoarece exist\u0103 posibilitatea de a preveni \u00eenlocuirea adresei:<\/p>\n<p><b>Op\u021biunea 1: Editarea fi\u0219ierului hosts (pentru desktop)<\/b><\/p>\n<p>Fi\u0219ierul hosts este o parte integrant\u0103 a oric\u0103rui sistem de operare, ceea ce permite utilizarea acestuia \u00een permanen\u021b\u0103. Pentru a accesa resursa, utilizatorul trebuie s\u0103:<\/p>\n<ol>\n<li>Afl\u0103 adresa IP a resursei solicitate<\/li>\n<li>Deschide fi\u0219ierul hosts pentru editare (se necesit\u0103 drepturi de administrator), situat \u00een:\n<ul>\n<li>Linux: \/etc\/hosts<\/li>\n<li>Windows: %WinDir%System32driversetchosts<\/li>\n<\/ul>\n<\/li>\n<li>Adaug\u0103 o linie \u00een formatul:<\/li>\n<li>Salveaz\u0103 modific\u0103rile<\/li>\n<\/ol>\n<p>\nAvantajul acestei metode este complexitatea sa \u0219i cerin\u021ba de a avea drepturi de administrator.<\/p>\n<p><b>Op\u021biunea 2: DoH (DNS over HTTPS) sau DoT (DNS over TLS)<\/b><\/p>\n<p>Aceste metode permit protejarea \u00eempotriva \u00eenlocuirii cererilor DNS prin criptare, \u00eens\u0103 implementarea nu este sus\u021binut\u0103 de toate aplica\u021biile. S\u0103 analiz\u0103m simplitatea configur\u0103rii DoH pentru Mozilla Firefox versiunea 66 din perspectiva utilizatorului:<\/p>\n<ol>\n<li>Accesa\u021bi adresa <noindex><a rel=\"nofollow\" href=\"http:\/\/about:config\">about:config<\/a><\/noindex> \u00een Firefox<\/li>\n<li>Confirm\u0103 c\u0103 utilizatorul \u00ee\u0219i asum\u0103 toate riscurile<\/li>\n<li>Schimb\u0103 valoarea parametrului <b>network.trr.mode<\/b> la:\n<ul>\n<li>0 \u2014 dezactiveaz\u0103 TRR<\/li>\n<li>1 \u2014 alegere automat\u0103<\/li>\n<li>2 \u2014 activeaz\u0103 DoH implicit<\/li>\n<\/ul>\n<\/li>\n<li>Schimb\u0103 parametrul <b>network.trr.uri<\/b> aleg\u00e2nd serverul DNS\n<ul>\n<li>Cloudflare DNS: <noindex>mozilla.cloudflare-dns.com\/dns-query<\/noindex><\/li>\n<li>Google DNS: <noindex>dns.google.com\/experimental<\/noindex><\/li>\n<\/ul>\n<\/li>\n<li>Schimb\u0103 parametrul <b>network.trr.boostrapAddress<\/b> la:\n<ul>\n<li>Dac\u0103 a fost ales Cloudflare DNS: 1.1.1.1<\/li>\n<li>Dac\u0103 a fost ales Google DNS: 8.8.8.8<\/li>\n<\/ul>\n<\/li>\n<li>Schimb\u0103 valoarea parametrului <b>network.security.esni.enabled<\/b> pe <b>true<\/b><\/li>\n<li>Verific\u0103 corectitudinea configur\u0103rii folosind <noindex><a rel=\"nofollow\" href=\"https:\/\/www.cloudflare.com\/ssl\/encrypted-sni\/\">serviciul Cloudflare<\/a><\/noindex><\/li>\n<\/ol>\n<p>\nDe\u0219i aceast\u0103 metod\u0103 este mai complex\u0103, nu necesit\u0103 drepturi de administrator din partea utilizatorului, iar exist\u0103 multe alte metode de protec\u021bie a cererilor DNS, nefiind descrise \u00een acest articol.<\/p>\n<p><b>Op\u021biunea 3 (pentru dispozitive mobile):<\/b> <\/p>\n<p>Folosirea aplica\u021biei de la Cloudflare pentru <noindex><a rel=\"nofollow\" href=\"https:\/\/play.google.com\/store\/apps\/details?id=com.cloudflare.onedotonedotonedotone\">Android<\/a><\/noindex> \u0219i <noindex><a rel=\"nofollow\" href=\"https:\/\/itunes.apple.com\/us\/app\/1-1-1-1-faster-internet\/id1423538627?mt=8\">iOS<\/a><\/noindex>.<\/p>\n<h3>Testare<\/h3>\n<p>\nPentru a verifica absen\u021ba accesului la resurse, a fost achizi\u021bionat temporar un domeniu blocat pe teritoriul RF:<\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"http:\/\/1winu.xyz:80\">Verificare HTTP + port 80<\/a><\/noindex><\/li>\n<li><noindex>Verificare HTTP + port 8080<\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/1winu.xyz:443\">Verificare HTTPS + port 443<\/a><\/noindex><\/li>\n<li><noindex>Verificare HTTPS + port 8443<\/noindex><\/li>\n<\/ul>\n<p><\/p>\n<h3>Concluzie<\/h3>\n<p>\nSper c\u0103 acest articol va fi util \u0219i va \u00eencuraja nu doar administratorii s\u0103 se aprofundeze \u00een subiect, ci va oferi \u0219i \u00een\u021belegerea c\u0103 <b>resursele vor fi \u00eentotdeauna de partea utilizatorului, iar c\u0103utarea de noi solu\u021bii trebuie s\u0103 fie o parte esen\u021bial\u0103 pentru ei.<\/b><\/p>\n<h4>Linkuri utile<\/h4>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/globalsign\/blog\/427563\/\">Implementarea standardului Encrypted SNI \u00een Firefox<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/335436\/\">Metod\u0103 autonom\u0103 de ocolire a DPI<\/a><\/noindex><\/li>\n<\/ul>\n<p>\n<b class=\"spoiler_title\">Supliment la articol<\/b>Testul pe Cloudflare nu poate fi efectuat \u00een re\u021beaua operatorului Tele2, iar un DPI configurat corect blocheaz\u0103 accesul la platforma de testare. <br \/>\nP.S. Acesta este primul provider care blocheaz\u0103 corect resursele.<\/p>\n<p>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/453260\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0434\u0430\u043d\u043d\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043d\u0435 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043f\u043e\u043b\u043d\u0430\u044f \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430 DPI \u0438 \u0432\u0441\u0435 \u0432\u043c\u0435\u0441\u0442\u0435 \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u043e\u0435, \u0430 \u043d\u0430\u0443\u0447\u043d\u0430\u044f \u0446\u0435\u043d\u043d\u043e\u0441\u0442\u044c \u0442\u0435\u043a\u0441\u0442\u0430 \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u0430. \u041d\u043e \u0432 \u043d\u0435\u0439 \u043e\u043f\u0438\u0441\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0441\u0442\u0435\u0439\u0448\u0438\u0439 \u0441\u043f\u043e\u0441\u043e\u0431 \u043e\u0431\u0445\u043e\u0434\u0430 DPI, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043d\u0435 \u0443\u0447\u043b\u0438 \u043c\u043d\u043e\u0433\u0438\u0435 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438. \u041f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u0435 \u21161: \u0434\u0430\u043d\u043d\u0430\u044f \u0441\u0442\u0430\u0442\u044c\u044f \u043d\u0435\u0441\u0435\u0442 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u0438\u0445 \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440, \u043d\u0435 \u043f\u043e\u0431\u0443\u0436\u0434\u0430\u0435\u0442 \u043d\u0438\u043a\u043e\u0433\u043e \u0447\u0442\u043e-\u043b\u0438\u0431\u043e \u043f\u0440\u0435\u0434\u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0442\u044c \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c. \u0418\u0434\u0435\u044f \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 \u043b\u0438\u0447\u043d\u043e\u043c \u043e\u043f\u044b\u0442\u0435, \u0430 \u043b\u044e\u0431\u044b\u0435 \u0441\u043e\u0432\u043f\u0430\u0434\u0435\u043d\u0438\u044f \u0441\u043b\u0443\u0447\u0430\u0439\u043d\u044b. \u041f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u0435 \u21162: [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":25916,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-34402","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u0434\u0430\u043d\u043d\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043d\u0435 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