{"id":103112,"date":"2022-01-27T15:37:02","date_gmt":"2022-01-27T13:37:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-dns-servera-bind-9-18-0-s-podderzhkoj-dns-over-tls-i-dns-over-https"},"modified":"2022-01-27T15:37:02","modified_gmt":"2022-01-27T13:37:02","slug":"vypusk-dns-servera-bind-9-18-0-s-podderzhkoj-dns-over-tls-i-dns-over-https","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/vypusk-dns-servera-bind-9-18-0-s-podderzhkoj-dns-over-tls-i-dns-over-https","title":{"rendered":"A BIND 9.18.0 DNS-szerver kiad\u00e1sa DNS-over-TLS \u00e9s DNS-over-HTTPS t\u00e1mogat\u00e1ssal.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>K\u00e9t \u00e9v fejleszt\u00e9s ut\u00e1n az ISC konzorcium bemutatta a BIND 9.18 \u00faj, jelent\u0151s \u00e1g\u00e1nak els\u0151 stabil kiad\u00e1s\u00e1t. A 9.18 \u00e1g t\u00e1mogat\u00e1sa h\u00e1rom \u00e9ven \u00e1t, 2025 m\u00e1sodik negyed\u00e9v\u00e9ig fog zajlani a kib\u0151v\u00edtett fenntart\u00e1si ciklus keret\u00e9ben. A 9.11 \u00e1g t\u00e1mogat\u00e1sa m\u00e1rciusban, a 9.16 \u00e1g t\u00e1mogat\u00e1sa pedig 2023 k\u00f6zep\u00e9n fog megsz\u0171nni. A k\u00f6vetkez\u0151 stabil verzi\u00f3 funkcionalit\u00e1s\u00e1nak fejleszt\u00e9se \u00e9rdek\u00e9ben l\u00e9trej\u00f6tt a BIND 9.19.0 k\u00eds\u00e9rleti \u00e1ga.    <\/p>\n<p>A BIND 9.18.0 release is notable for its implementation of support for DNS over HTTPS (DoH) and DNS over TLS (DoT) technologies, as well as the XoT (XFR-over-TLS) mechanism for secure transmission of DNS zone contents between servers (supporting both the transfer and reception of zones via XoT). With appropriate settings, a single named process can now handle not only traditional DNS queries but also those sent using DNS-over-HTTPS and DNS-over-TLS. Client support for DNS-over-TLS is built into the dig utility, which can be used to send requests over TLS by specifying the '+tls' flag.     <\/p>\n<p>A DoH-ban haszn\u00e1lt HTTP\/2 protokoll megval\u00f3s\u00edt\u00e1sa az nghttp2 k\u00f6nyvt\u00e1r alkalmaz\u00e1s\u00e1n alapul, amely az opcion\u00e1lis build f\u00fcgg\u0151s\u00e9gek k\u00f6z\u00e9 tartozik. A DoH \u00e9s DoT sz\u00e1m\u00e1ra a tan\u00fas\u00edtv\u00e1nyokat a felhaszn\u00e1l\u00f3 biztos\u00edthatja, vagy automatikusan gener\u00e1lhat\u00f3k az ind\u00edt\u00e1s sor\u00e1n.         <\/p>\n<p>Processing requests using DoH and DoT is enabled by adding the 'http' and 'tls' options to the listen-on directive. To support unencrypted DNS-over-HTTP, the configuration should specify 'tls none'. Keys are defined in the 'tls' section. The standard network ports 853 for DoT, 443 for DoH, and 80 for DNS-over-HTTP can be overridden using the tls-port, https-port, and http-port parameters. For example:  <\/p>\n<p>     tls local-tls {         key-file '\/path\/to\/priv_key.pem';         cert-file '\/path\/to\/cert_chain.pem';     };     http local-http-server {        endpoints { '\/dns-query';  };     };     options {        https-port 443;        listen-on port 443 tls local-tls http myserver {any;};     }        <\/p>\n<p>A DoH megval\u00f3s\u00edt\u00e1s\u00e1nak jellemz\u0151je a TLS titkos\u00edt\u00e1si m\u0171veletek egy m\u00e1sik szerverre val\u00f3 \u00e1thelyez\u00e9se, ami akkor lehet sz\u00fcks\u00e9ges, ha a TLS tan\u00fas\u00edtv\u00e1nyokat egy m\u00e1sik rendszeren t\u00e1rolj\u00e1k (p\u00e9ld\u00e1ul webkiszolg\u00e1l\u00f3s infrastrukt\u00far\u00e1ban), \u00e9s m\u00e1s szem\u00e9lyzet kezeli. A nem titkos\u00edtott DNS-over-HTTP t\u00e1mogat\u00e1sa a hibakeres\u00e9s megk\u00f6nny\u00edt\u00e9se \u00e9rdek\u00e9ben \u00e9s mint szint a bels\u0151 h\u00e1l\u00f3zaton val\u00f3 tov\u00e1bb\u00edt\u00e1shoz (a titkos\u00edt\u00e1s m\u00e1sik szerverre val\u00f3 \u00e1thelyez\u00e9s\u00e9hez) val\u00f3sult meg. A TLS forgalom l\u00e9trehoz\u00e1s\u00e1hoz a kivezetett szerveren nginx alkalmazhat\u00f3, hasonl\u00f3an ahhoz, ahogyan a HTTPS k\u00f6t\u0151d\u00e9s t\u00f6rt\u00e9nik a webhelyek eset\u00e9ben.    <\/p>\n<p>Egy m\u00e1sik jellemz\u0151 a DoH integr\u00e1ci\u00f3ja, mint egy \u00e1ltal\u00e1nos sz\u00e1ll\u00edt\u00e1si m\u00f3dszer, amely nemcsak a kliens k\u00e9r\u00e9sek feldolgoz\u00e1s\u00e1ra szolg\u00e1l a felold\u00f3hoz, hanem a szerverek k\u00f6z\u00f6tti adatcser\u00e9ben, az \u00f6vezetek \u00e1tad\u00e1s\u00e1n szint\u00e9n az illet\u00e9kes DNS-kiszolg\u00e1l\u00f3 \u00e1ltal, \u00e9s b\u00e1rmilyen, m\u00e1s DNS sz\u00e1ll\u00edt\u00e1sok \u00e1ltal t\u00e1mogatott k\u00e9r\u00e9sek feldolgoz\u00e1sa sor\u00e1n is alkalmazhat\u00f3.      <\/p>\n<p>Among the drawbacks that can be mitigated by disabling the DoH\/DoT build or offloading encryption to another server is the overall complexity of the code base \u2014 with an integrated HTTP server and TLS library added, which potentially may contain vulnerabilities and act as additional attack vectors. Additionally, using DoH increases traffic.    <\/p>\n<p>Ne feledj\u00fck, hogy a DNS-over-HTTPS hasznos lehet a szolg\u00e1ltat\u00f3k DNS szerverei \u00e1ltal t\u00f6rt\u00e9n\u0151 h\u00edvott hostnevek adatainak kisziv\u00e1rg\u00e1s\u00e1nak megakad\u00e1lyoz\u00e1s\u00e1ra, a MITM t\u00e1mad\u00e1sokkal \u00e9s a DNS forgalom hamis\u00edt\u00e1s\u00e1val szembeni v\u00e9dekez\u00e9sre (p\u00e9ld\u00e1ul nyilv\u00e1nos Wi-Fi haszn\u00e1latakor), valamint a DNS szint\u0171 blokkol\u00e1sokkal szembeni k\u00fczdelemre (a DNS-over-HTTPS nem helyettes\u00edthet\u0151 a blokkol\u00e1sok megker\u00fcl\u00e9s\u00e9ben, amelyeket a DPI szintj\u00e9n val\u00f3s\u00edtanak meg) vagy a DNS szerverekhez val\u00f3 k\u00f6zvetlen csatlakoz\u00e1s hi\u00e1ny\u00e1ban val\u00f3 m\u0171k\u00f6d\u00e9s megszervez\u00e9s\u00e9re (p\u00e9ld\u00e1ul proxy-n kereszt\u00fcli m\u0171k\u00f6d\u00e9s eset\u00e9n). Ha a norm\u00e1l helyzetben a DNS lek\u00e9rdez\u00e9sek k\u00f6zvetlen\u00fcl a rendszer konfigur\u00e1ci\u00f3j\u00e1ban megadott DNS szerverekre ker\u00fclnek, akkor DNS-over-HTTPS eset\u00e9n a lek\u00e9rdez\u00e9s a <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"199\">VPN<\/a> hostot a HTTPS forgalom keretein bel\u00fcl kapszul\u00e1zva \u00e9s egy HTTP szerverre k\u00fcldve, amelyen a resolver a web API-n kereszt\u00fcl dolgozza fel a lek\u00e9rdez\u00e9seket. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/lir\/ipv4\/\"   title=\"IP address\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"697\">IP address<\/a> A \u201eDNS over TLS\u201d a \u201eDNS over HTTPS\u201d-t\u0151l abban k\u00fcl\u00f6nb\u00f6zik, hogy a szok\u00e1sos DNS protokollt (amely \u00e1ltal\u00e1ban a 853-as portot haszn\u00e1lja) titkos\u00edtott kapcsolaton kereszt\u00fcl val\u00f3s\u00edtja meg, amelyet a TLS protokoll seg\u00edts\u00e9g\u00e9vel alak\u00edtanak ki, a host \u00e9rv\u00e9nyes\u00edt\u00e9se TLS\/SSL tan\u00fas\u00edtv\u00e1nyokkal, amelyeket egy hiteles\u00edt\u00e9si k\u00f6zpont igazolt. Az egy l\u00e9tez\u0151 DNSSEC szabv\u00e1ny csak az \u00fcgyf\u00e9l \u00e9s a szerver hiteles\u00edt\u00e9s\u00e9nek biztos\u00edt\u00e1s\u00e1ra haszn\u00e1l titkos\u00edt\u00e1st, de nem v\u00e9di a forgalmat a lehallgat\u00e1st\u00f3l \u00e9s nem garant\u00e1lja a lek\u00e9rdez\u00e9sek titkoss\u00e1g\u00e1t.     <\/p>\n<p>&#171;DNS over TLS&#187; differs from &#171;DNS over HTTPS&#187; by applying the standard DNS protocol (usually using network port 853), wrapped in an encrypted communication channel established via the TLS protocol with host validation through TLS\/SSL certificates issued by a certificate authority. The existing DNSSEC standard uses encryption only for client and server authentication, but does not protect traffic from interception and does not guarantee the confidentiality of requests.         <\/p>\n<p>N\u00e9h\u00e1ny egy\u00e9b \u00fajdons\u00e1g:  <\/p>\n<ul>\n<li class=\"l\"> New settings for tcp-receive-buffer, tcp-send-buffer, udp-receive-buffer, and udp-send-buffer have been added to specify the sizes of buffers used for sending and receiving requests over TCP and UDP. On busy servers, increasing incoming buffers can help avoid packet loss during traffic peaks, while decreasing can help eliminate memory clutter from old requests.\n<li class=\"l\"> A new log category 'rpz-passthru' has been added, allowing for separate logging of RPZ (Response Policy Zones) passthrough actions.\n<li class=\"l\"> A response-policy szekci\u00f3hoz hozz\u00e1adtuk az \u00abnsdname-wait-recurse\u00bb opci\u00f3t, amelynek no \u00e9rt\u00e9k\u00e9nek be\u00e1ll\u00edt\u00e1sakor a RPZ NSDNAME szab\u00e1lyok csak akkor alkalmazand\u00f3k, ha az adott lek\u00e9rdez\u00e9shez megtal\u00e1lhat\u00f3k a gyors\u00edt\u00f3t\u00e1rban l\u00e9v\u0151 szakmai n\u00e9vszerverek, ellenkez\u0151 esetben a RPZ NSDNAME szab\u00e1ly figyelmen k\u00edv\u00fcl marad, de az inform\u00e1ci\u00f3 a h\u00e1tt\u00e9rben kinyer\u00e9sre ker\u00fcl \u00e9s alkalmaz\u00e1sra ker\u00fcl a k\u00f6vetkez\u0151 lek\u00e9rdez\u00e9sekhez.\n<li class=\"l\"> HTTPS \u00e9s SVCB t\u00edpus\u00fa rekordok eset\u00e9n megval\u00f3s\u00edtottuk az \u00abADDITIONAL\u00bb szekci\u00f3 feldolgoz\u00e1s\u00e1t.\n<li class=\"l\"> \u00daj egy\u00e9ni update-policy szab\u00e1lyt\u00edpusok lettek hozz\u00e1adva \u2014 krb5-subdomain-self-rhs \u00e9s ms-subdomain-self-rhs, amelyek lehet\u0151v\u00e9 teszik a SRV \u00e9s PTR rekordok friss\u00edt\u00e9s\u00e9nek korl\u00e1toz\u00e1s\u00e1t. Az update-policy blokkokban lehet\u0151s\u00e9g ny\u00edlik a rekordok sz\u00e1m\u00e1nak korl\u00e1toz\u00e1s\u00e1ra, k\u00fcl\u00f6n-k\u00fcl\u00f6n minden t\u00edpus sz\u00e1m\u00e1ra.\n<li class=\"l\"> A dig eszk\u00f6z kimenet\u00e9hez inform\u00e1ci\u00f3k ker\u00fcltek hozz\u00e1ad\u00e1sra a sz\u00e1ll\u00edt\u00e1si protokollr\u00f3l (UDP, TCP, TLS, HTTPS) \u00e9s a DNS64 el\u0151tagokr\u00f3l. Hibakeres\u00e9si c\u00e9lokra a dig rendszerbe ker\u00fclt a lehet\u0151s\u00e9g, hogy megadjuk a k\u00e9r\u00e9s azonos\u00edt\u00f3j\u00e1t (dig +qid=).\n<li class=\"l\"> Hozz\u00e1adtuk az OpenSSL 3.0 k\u00f6nyvt\u00e1r t\u00e1mogat\u00e1s\u00e1t.\n<li class=\"l\"> A DNS \u00fczenetek nagy m\u00e9ret\u0171 feldolgoz\u00e1s\u00e1val kapcsolatos IP-fragment\u00e1ci\u00f3s probl\u00e9m\u00e1k megold\u00e1sa \u00e9rdek\u00e9ben, a DNS Flag Day 2020 kezdem\u00e9nyez\u00e9s keret\u00e9ben, a resolverb\u0151l elt\u00e1vol\u00edtottuk a k\u00f3dot, amely az EDNS puffer m\u00e9ret\u00e9nek m\u00f3dos\u00edt\u00e1s\u00e1t v\u00e9gezte, ha nem \u00e9rkezett v\u00e1lasz a k\u00e9r\u00e9sre. Az EDNS puffer m\u00e9rete mostant\u00f3l \u00e1lland\u00f3 (edns-udp-size) minden kimen\u0151 k\u00e9r\u00e9sn\u00e9l.\n<li class=\"l\"> A build rendszer autoconf, automake \u00e9s libtool csomagok haszn\u00e1lat\u00e1ra lett \u00e1t\u00e1ll\u00edtva.\n<li class=\"l\"> A \u00abmap\u00bb form\u00e1tum\u00fa z\u00f3naf\u00e1jlok t\u00e1mogat\u00e1sa megsz\u0171nt (masterfile-format map). A form\u00e1tumot haszn\u00e1l\u00f3 felhaszn\u00e1l\u00f3knak javasolt a z\u00f3n\u00e1kat \u00e1tkonvert\u00e1lni raw form\u00e1tumba a named-compilezone eszk\u00f6z seg\u00edts\u00e9g\u00e9vel.\n<li class=\"l\"> A r\u00e9gi DLZ (Dynamically Loadable Zones) illeszt\u0151programok t\u00e1mogat\u00e1sa megsz\u0171nt, helyett\u00fck a DLZ modulok ker\u00fcltek bevezet\u00e9sre.\n<li class=\"l\"> A Windows platformra vonatkoz\u00f3 \u00e9p\u00edt\u00e9si \u00e9s futtat\u00e1si t\u00e1mogat\u00e1s megsz\u0171nt. Az utols\u00f3 verzi\u00f3, amely telep\u00edthet\u0151 Windows-ra, a BIND 9.16 maradt.                   <\/ul>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56589\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0434\u0432\u0443\u0445 \u043b\u0435\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043a\u043e\u043d\u0441\u043e\u0440\u0446\u0438\u0443\u043c ISC \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b \u043f\u0435\u0440\u0432\u044b\u0439 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0439 \u0440\u0435\u043b\u0438\u0437 \u043d\u043e\u0432\u043e\u0439 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 BIND 9.18. \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u0432\u0435\u0442\u043a\u0438 9.18 \u0431\u0443\u0434\u0435\u0442 \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0442\u044c\u0441\u044f \u0432 \u0442\u0435\u0447\u0435\u043d\u0438\u0435 \u0442\u0440\u0451\u0445 \u043b\u0435\u0442 \u0434\u043e 2 \u043a\u0432\u0430\u0440\u0442\u0430\u043b\u0430 2025 \u0433\u043e\u0434\u0430 \u0432 \u0440\u0430\u043c\u043a\u0430\u0445 \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u043d\u043e\u0433\u043e \u0446\u0438\u043a\u043b\u0430 \u0441\u043e\u043f\u0440\u043e\u0432\u043e\u0436\u0434\u0435\u043d\u0438\u044f. \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u0432\u0435\u0442\u043a\u0438 9.11 \u043f\u0440\u0435\u043a\u0440\u0430\u0442\u0438\u0442\u0441\u044f \u0432 \u043c\u0430\u0440\u0442\u0435, \u0430 \u0432\u0435\u0442\u043a\u0438 9.16 \u0432 \u0441\u0435\u0440\u0435\u0434\u0438\u043d\u0435 2023 \u0433\u043e\u0434\u0430. \u0414\u043b\u044f \u0440\u0430\u0437\u0432\u0438\u0442\u0438\u044f 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