{"id":37892,"date":"2019-10-31T22:20:24","date_gmt":"2019-10-31T19:20:24","guid":{"rendered":"https:\/\/prohoster.info\/blog\/mozilla-perehodit-k-vklyucheniyu-po-umolchaniyu-dns-over-https-v-firefox\/"},"modified":"2019-10-31T22:20:24","modified_gmt":"2019-10-31T19:20:24","slug":"mozilla-perehodit-k-vklyucheniyu-po-umolchaniyu-dns-over-https-v-firefox","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/mozilla-perehodit-k-vklyucheniyu-po-umolchaniyu-dns-over-https-v-firefox","title":{"rendered":"A Mozilla a DNS-over-HTTPS alap\u00e9rtelmez\u00e9s szerint t\u00f6rt\u00e9n\u0151 enged\u00e9lyez\u00e9s\u00e9re v\u00e1lt a Firefoxban","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A Firefox fejleszt\u0151i <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.mozilla.org\/futurereleases\/2019\/09\/06\/whats-next-in-making-dns-over-https-the-default\/\">bejelentett\u00e9k<\/a><\/noindex> a DNS over HTTPS (DoH) t\u00e1mogat\u00e1s\u00e1nak tesztel\u00e9s\u00e9nek befejez\u00e9s\u00e9r\u0151l \u00e9s arr\u00f3l, hogy a h\u00f3nap v\u00e9g\u00e9n az Egyes\u00fclt \u00c1llamokban a technol\u00f3gi\u00e1t alap\u00e9rtelmezett\u00e9 k\u00edv\u00e1nj\u00e1k tenni a felhaszn\u00e1l\u00f3k sz\u00e1m\u00e1ra. A bekapcsol\u00e1s fokozatosan t\u00f6rt\u00e9nik, el\u0151sz\u00f6r csak a felhaszn\u00e1l\u00f3k n\u00e9h\u00e1ny sz\u00e1zal\u00e9k\u00e1n\u00e1l, majd probl\u00e9mamentess\u00e9g eset\u00e9n fokozatosan 100%-ra n\u00f6velik. Az Egyes\u00fclt \u00c1llamok ut\u00e1n megfontolj\u00e1k a DoH m\u00e1s orsz\u00e1gokban val\u00f3 aktiv\u00e1l\u00e1s\u00e1t is.<\/p>\n<p>Az \u00e9v sor\u00e1n v\u00e9gzett tesztek bizony\u00edtott\u00e1k a szolg\u00e1ltat\u00e1s megb\u00edzhat\u00f3s\u00e1g\u00e1t \u00e9s j\u00f3 teljes\u00edtm\u00e9ny\u00e9t, valamint lehet\u0151s\u00e9get adtak arra, hogy azonos\u00edts\u00e1k azokat a helyzeteket, amikor a DoH probl\u00e9m\u00e1khoz vezethet, \u00e9s kidolgozz\u00e1k a megold\u00e1sokat ezek elker\u00fcl\u00e9s\u00e9re (p\u00e9ld\u00e1ul elemezve <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50448\">probl\u00e9ma<\/a><\/noindex> a tartalomeloszt\u00f3 h\u00e1l\u00f3zatok forgalomoptimaliz\u00e1l\u00e1sa, a sz\u00fcl\u0151i fel\u00fcgyelet \u00e9s a v\u00e1llalati bels\u0151 DNS-z\u00f3n\u00e1k). <\/p>\n<p>A DNS-forgalom titkos\u00edt\u00e1s\u00e1nak fontoss\u00e1g\u00e1t alapvet\u0151 felhaszn\u00e1l\u00f3i v\u00e9delmi t\u00e9nyez\u0151k\u00e9nt \u00e9rt\u00e9kelik, ez\u00e9rt a DoH-t alap\u00e9rtelmezettk\u00e9nt k\u00edv\u00e1nj\u00e1k aktiv\u00e1lni, de az els\u0151 szakaszban csak az Egyes\u00fclt \u00c1llamokban \u00e9l\u0151 felhaszn\u00e1l\u00f3k sz\u00e1m\u00e1ra. A DoH aktiv\u00e1l\u00e1sa ut\u00e1n a felhaszn\u00e1l\u00f3 figyelmeztet\u00e9st kap, amely lehet\u0151v\u00e9 teszi, hogy k\u00e9r\u00e9s\u00e9re lemondjon a k\u00f6zpontos\u00edtott DoH DNS-szerverekhez val\u00f3 csatlakoz\u00e1sr\u00f3l, \u00e9s visszat\u00e9rjen a hagyom\u00e1nyos, titkos\u00edtatlan DNS-k\u00e9relmek k\u00fcld\u00e9s\u00e9re a szolg\u00e1ltat\u00f3 DNS-szerver\u00e9hez (ellent\u00e9tben a DoH-ban haszn\u00e1lt elosztott DNS-rezolvert-infrastrukt\u00far\u00e1val, amelyet egy adott DoH-szolg\u00e1ltat\u00e1shoz val\u00f3 k\u00f6t\u0151d\u00e9s jellemez, ami egys\u00e9ges hibapontk\u00e9nt is \u00e9rtelmezhet\u0151).<\/p>\n<p>A DoH aktiv\u00e1l\u00e1sa eset\u00e9n a sz\u00fcl\u0151i fel\u00fcgyelet \u00e9s a v\u00e1llalati h\u00e1l\u00f3zatok m\u0171k\u00f6d\u00e9se megs\u00e9r\u00fclhet, amelyek kiz\u00e1r\u00f3lag a bels\u0151 h\u00e1l\u00f3zat sz\u00e1m\u00e1ra el\u00e9rhet\u0151 DNS-n\u00e9vstrukt\u00far\u00e1t haszn\u00e1lnak intranet-c\u00edmek \u00e9s v\u00e1llalati hosztok \u00e1talak\u00edt\u00e1s\u00e1ra. Az ilyen rendszerek probl\u00e9m\u00e1inak megold\u00e1s\u00e1ra egy ellen\u0151rz\u00e9si rendszert vezettek be, amely automatikusan lekapcsolja a DoH-t. Az ellen\u0151rz\u00e9sek minden b\u00f6ng\u00e9sz\u0151ind\u00edt\u00e1skor vagy egy alh\u00e1l\u00f3zat megv\u00e1ltoztat\u00e1s\u00e1nak \u00e9szlel\u00e9sekor v\u00e9grehajt\u00e1sra ker\u00fclnek.<\/p>\n<p>A rendszer automatikus vissza\u00e1ll\u00edt\u00e1sa a norm\u00e1l oper\u00e1ci\u00f3s rendszer felold\u00f3ra szint\u00e9n el\u0151 van \u00edrva, ha a DNS-alap\u00fa felold\u00e1s (DoH) sor\u00e1n hiba l\u00e9p fel (p\u00e9ld\u00e1ul, ha a DoH szolg\u00e1ltat\u00f3val val\u00f3 h\u00e1l\u00f3zati el\u00e9rhet\u0151s\u00e9g megszakad, vagy hib\u00e1k l\u00e9pnek fel az infrastrukt\u00far\u00e1j\u00e1ban). Az ilyen ellen\u0151rz\u00e9sek \u00e9rtelme megk\u00e9rd\u0151jelezhet\u0151, mivel senki sem akad\u00e1lyozza meg a t\u00e1mad\u00f3kat, akik ir\u00e1ny\u00edtj\u00e1k a felold\u00f3t vagy k\u00e9pesek beavatkozni a forgalomba, hogy szimul\u00e1lj\u00e1k ezt a viselked\u00e9st a DNS-forgalom titkos\u00edt\u00e1s\u00e1nak kikapcsol\u00e1s\u00e1hoz. A probl\u00e9ma megold\u00e1s\u00e1ra egy \u00faj be\u00e1ll\u00edt\u00e1s ker\u00fclt bevezet\u00e9sre, az &#171;DoH always&#187; opci\u00f3 (alap\u00e9rtelmez\u00e9s szerint nem akt\u00edv), amelynek aktiv\u00e1l\u00e1s\u00e1val az automatikus kikapcsol\u00e1s nem \u00e9rv\u00e9nyes\u00fcl, ez pedig \u00e9sszer\u0171 kompromisszumnak sz\u00e1m\u00edt.<\/p>\n<p>A v\u00e1llalati felold\u00f3k m\u0171k\u00f6d\u00e9s\u00e9nek meghat\u00e1roz\u00e1s\u00e1ra a nem szokv\u00e1nyos fels\u0151 szint\u0171 domainek (TLD) ellen\u0151rz\u00e9se \u00e9s az intranet-c\u00edmek visszaad\u00e1sa t\u00f6rt\u00e9nik a rendszerszint\u0171 felold\u00f3 \u00e1ltal. A sz\u00fcl\u0151i kontroll aktiv\u00e1l\u00e1s\u00e1nak meg\u00e1llap\u00edt\u00e1s\u00e1hoz megpr\u00f3b\u00e1lnak feloldani egy p\u00e9ld\u00e1hoz hasonl\u00f3 nevet, mint az exampleadultsite.com, \u00e9s ha az eredm\u00e9ny nem egyezik a t\u00e9nyleges IP-c\u00edmmel, akkor az DNS szinten akt\u00edvnak tekintik a feln\u0151tt tartalom blokkol\u00e1s\u00e1t. Tov\u00e1bbi jelekk\u00e9nt az IP-c\u00edmek Google \u00e9s YouTube vonatkoz\u00e1s\u00e1ban az \u0151 helyettes\u00edt\u00e9s\u00fck ellen\u0151rz\u00e9s\u00e9re is t\u00f6rt\u00e9nik, mint pl. restrict.youtube.com, forcesafesearch.google.com \u00e9s restrictmoderate.youtube.com. Tov\u00e1bb\u00e1 a Mozilla <noindex><a rel=\"nofollow\" href=\"https:\/\/support.mozilla.org\/en-US\/kb\/configuring-networks-disable-dns-over-https\">aj\u00e1nlatot tesz<\/a><\/noindex> bevezetni egy egys\u00e9ges ellen\u0151rz\u0151 hosztot <noindex><a rel=\"nofollow\" href=\"https:\/\/use-application-dns.net\/\">use-application-dns.net<\/a><\/noindex>, amelyet az internetszolg\u00e1ltat\u00f3k \u00e9s a sz\u00fcl\u0151i ellen\u0151rz\u00e9si szolg\u00e1ltat\u00e1sok a DoH letilt\u00e1s\u00e1ra haszn\u00e1lnak (ha a hoszt nem tal\u00e1lhat\u00f3, a Firefox letiltja a DoH-t).<\/p>\n<p>Egyetlen DoH-szolg\u00e1ltat\u00f3 haszn\u00e1lata potenci\u00e1lisan probl\u00e9m\u00e1kat okozhat a forgalom optimaliz\u00e1l\u00e1s\u00e1ban a tartalomell\u00e1t\u00f3 h\u00e1l\u00f3zatokban, amelyek DNS-alap\u00fa terhel\u00e9seloszt\u00e1st v\u00e9geznek (a CDN-h\u00e1l\u00f3zat DNS-szervere v\u00e1lasz\u00e1t a felold\u00f3 c\u00edm\u00e9re figyelembe v\u00e9ve adja meg, \u00e9s a tartalom el\u00e9r\u00e9s\u00e9hez legk\u00f6zelebbi hoszt c\u00edm\u00e9t adja). A DNS-lek\u00e9rdez\u00e9s elk\u00fcld\u00e9se a felhaszn\u00e1l\u00f3hoz legk\u00f6zelebbi felold\u00f3r\u00f3l ilyen CDN eset\u00e9ben a felhaszn\u00e1l\u00f3hoz legk\u00f6zelebbi hoszt c\u00edm\u00e9nek visszaad\u00e1s\u00e1hoz vezet, de a k\u00f6zpontos\u00edtott felold\u00f3r\u00f3l elk\u00fcld\u00f6tt DNS-lek\u00e9rdez\u00e9s a DNS-over-HTTPS szerverhez legk\u00f6zelebbi hoszt c\u00edm\u00e9t adja meg. A gyakorlati tesztel\u00e9s azt mutatta, hogy a DNS-over-HTTP haszn\u00e1lata a CDN-ek mellett gyakorlatilag nem okozott k\u00e9sleltet\u00e9seket a tartalom \u00e1tvitele el\u0151tt (gyors kapcsolatok eset\u00e9n a k\u00e9sleltet\u00e9sek nem haladt\u00e1k meg a 10 milliszekundumot, m\u00edg lass\u00fa kapcsolatokn\u00e1l a m\u0171k\u00f6d\u00e9s felgyorsul\u00e1s\u00e1t is \u00e9szlelt\u00e9k). A CDN-nek a kliens tart\u00f3zkod\u00e1si hely\u00e9r\u0151l val\u00f3 inform\u00e1ci\u00f3k \u00e1tad\u00e1s\u00e1hoz az EDNS Client Subnet kiterjeszt\u00e9s alkalmaz\u00e1sa is figyelembe volt v\u00e9ve.<\/p>\n<p>Eml\u00e9keztet\u00fcnk, hogy a DoH hasznos lehet az inform\u00e1ci\u00f3k kiker\u00fcl\u00e9s\u00e9nek megakad\u00e1lyoz\u00e1s\u00e1ra a DNS-szerverek \u00e1ltal, a MITM-t\u00e1mad\u00e1sok \u00e9s a DNS-trafik manipul\u00e1l\u00e1s\u00e1nak ellen\u00e1ll\u00e1s\u00e1ra, a DNS-szint\u0171 blokkok ellen\u00e1ll\u00e1s\u00e1ra, vagy a DNS-szerverek k\u00f6zvetlen el\u00e9r\u00e9s\u00e9nek lehetetlens\u00e9ge eset\u00e9n (p\u00e9ld\u00e1ul proxy haszn\u00e1lata mellett). Norm\u00e1lis esetben a DNS-lek\u00e9rdez\u00e9sek k\u00f6zvetlen\u00fcl az oper\u00e1ci\u00f3s rendszer konfigur\u00e1ci\u00f3j\u00e1ban megadott DNS-szerverekhez ker\u00fclnek elk\u00fcld\u00e9sre, azonban DoH eset\u00e9n a hoszt IP-c\u00edm\u00e9nek meghat\u00e1roz\u00e1s\u00e1ra ir\u00e1nyul\u00f3 k\u00e9r\u00e9s az HTTPS forgalomba van be\u00e1gyazva, \u00e9s egy HTTP-szerverhez ker\u00fcl elk\u00fcld\u00e9sre, ahol a felold\u00f3 Web API-n kereszt\u00fcl dolgozza fel a lek\u00e9rdez\u00e9seket. A l\u00e9tez\u0151 DNSSEC szabv\u00e1ny csak az \u00fcgyf\u00e9l \u00e9s a szerver azonos\u00edt\u00e1s\u00e1ra haszn\u00e1l titkos\u00edt\u00e1st, de nem v\u00e9di meg a forgalmat a lehallgat\u00e1st\u00f3l, \u00e9s nem garant\u00e1lja a lek\u00e9rdez\u00e9sek titkoss\u00e1g\u00e1t. <\/p>\n<p>A DoH enged\u00e9lyez\u00e9s\u00e9hez az about:config oldalon meg kell v\u00e1ltoztatni a network.trr.mode v\u00e1ltoz\u00f3 \u00e9rt\u00e9k\u00e9t, amely a Firefox 60-t\u00f3l kezdve t\u00e1mogatott. A 0 \u00e9rt\u00e9k teljesen letiltja a DoH-t; 1 - a DNS vagy a DoH haszn\u00e1lata a gyorsabb elj\u00e1r\u00e1st\u00f3l f\u00fcgg; 2 - alap\u00e9rtelmezettk\u00e9nt a DoH haszn\u00e1lata, DNS mint tartal\u00e9k; 3 - csak a DoH haszn\u00e1lata; 4 - t\u00fck\u00f6r m\u00f3d, ahol a DoH \u00e9s a DNS p\u00e1rhuzamosan aktiv\u00e1lva van. Alap\u00e9rtelmez\u00e9s szerint a CloudFlare DNS-szerver haszn\u00e1latos, de a network.trr.uri param\u00e9teren kereszt\u00fcl m\u00f3dos\u00edthat\u00f3, p\u00e9ld\u00e1ul be\u00e1ll\u00edthat\u00f3 a &#171;https:\/\/dns.google.com\/experimental&#187; vagy a &#171;https:\/\/9.9.9.9\/dns-query&#187;.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51439\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 Firefox \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0438 \u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u0438 \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 DNS \u043f\u043e\u0432\u0435\u0440\u0445 HTTPS (DoH, DNS over HTTPS) \u0438 \u043d\u0430\u043c\u0435\u0440\u0435\u043d\u0438\u0438 \u0432 \u043a\u043e\u043d\u0446\u0435 \u0441\u0435\u043d\u0442\u044f\u0431\u0440\u044f \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u0434\u0430\u043d\u043d\u0443\u044e \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044e \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0434\u043b\u044f \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0421\u0428\u0410. \u0412\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u044c\u0441\u044f \u043f\u043e\u0441\u0442\u0443\u043f\u0430\u0442\u0435\u043b\u044c\u043d\u043e, \u0432\u043d\u0430\u0447\u0430\u043b\u0435 \u0434\u043b\u044f \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u043f\u0440\u043e\u0446\u0435\u043d\u0442\u043e\u0432 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439, \u0430 \u0432 \u0441\u043b\u0443\u0447\u0430\u0435 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u043f\u043e\u0441\u0442\u0435\u043f\u0435\u043d\u043d\u043e \u0434\u043e\u0432\u043e\u0434\u044f \u0434\u043e 100%. \u041f\u043e\u0441\u043b\u0435 \u043e\u0445\u0432\u0430\u0442\u0430 \u0421\u0428\u0410 \u0431\u0443\u0434\u0435\u0442 \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0435\u043d\u0430 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f DoH \u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-37892","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 Firefox \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0438 \u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u0438 \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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