{"id":36194,"date":"2019-10-31T22:10:13","date_gmt":"2019-10-31T19:10:13","guid":{"rendered":"https:\/\/prohoster.info\/blog\/reliz-powerdns-recursor-4-2-i-initsiativa-dns-flag-day-2020\/"},"modified":"2019-10-31T22:10:13","modified_gmt":"2019-10-31T19:10:13","slug":"reliz-powerdns-recursor-4-2-i-initsiativa-dns-flag-day-2020","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/reliz-powerdns-recursor-4-2-i-initsiativa-dns-flag-day-2020","title":{"rendered":"Udgivelsen af PowerDNS Recursor 4.2 og initiativet DNS flag dag 2020","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Efter halvandet \u00e5rs udvikling <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.powerdns.com\/2019\/07\/15\/powerdns-recursor-4-2-0-released\/\">pr\u00e6senteret<\/a><\/noindex> udgivelsen af den cachede DNS-server <noindex><a rel=\"nofollow\" href=\"https:\/\/www.powerdns.com\/recursor.html\">PowerDNS Recursor 4.2<\/a><\/noindex>, som er ansvarlig for rekursiv navneomdannelse. PowerDNS Recursor er bygget p\u00e5 et f\u00e6lles kodegrundlag med PowerDNS Authoritative Server, men de rekursive og autoritative DNS-servere fra PowerDNS udvikles under forskellige udviklingscyklusser og frigives som separate produkter. Koden for projektet <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/PowerDNS\/pdns\">distribueres<\/a><\/noindex> er under GPLv2-licensen. <\/p>\n<p>I den nye version er alle bem\u00e6rkninger vedr\u00f8rende behandling af DNS-pakker med EDNS-flag fjernet. I \u00e6ldre versioner af PowerDNS Recursor f\u00f8r 2016 blev pakker med ikke-underst\u00f8ttede EDNS-flag ignoreret uden at sende svar i det gamle format, ved at kassere EDNS-flagene som foreskrevet af specifikationen. Tidligere blev denne ikke-standardiserede adf\u00e6rd underst\u00f8ttet i BIND i form af en omg\u00e5else, men i <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49999\">den gennemf\u00f8rte<\/a><\/noindex> februar <noindex><a rel=\"nofollow\" href=\"https:\/\/dnsflagday.net\/2020\/\">DNS flag day<\/a><\/noindex>, har udviklerne af DNS-servere besluttet at opgive denne hack. <\/p>\n<p>I PowerDNS blev de vigtigste problemer med behandling af pakker med EDNS stadig l\u00f8st tilbage i 2017 i version 4.1, og i den version 4.0, der blev udgivet i 2016, opstod der enkle inkompatibiliteter, som i almindelighed ikke h\u00e6mmede normal drift. I PowerDNS Recursor 4.2, som i <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50372\">BIND 9.14<\/a><\/noindex>, er omg\u00e5elser for st\u00f8tte af autoritative servere, der svarer forkert p\u00e5 foresp\u00f8rgsler med EDNS-flag, blevet fjernet. Hidtil, hvis der ikke kom et svar efter at have sendt en foresp\u00f8rgsel med EDNS-flag efter et bestemt tidsrum, betragtede DNS-serveren, at de udvidede flag ikke blev underst\u00f8ttet og sendte en gentaget foresp\u00f8rgsel uden EDNS-flag. Fremadrettet er denne adf\u00e6rd deaktiveret, da tilstedev\u00e6relsen af s\u00e5dan kode f\u00f8rte til \u00f8get latency p\u00e5 grund af gentagne pakkeoverf\u00f8rsler, \u00f8get belastning p\u00e5 netv\u00e6rket og tvetydighed i mangel af svar p\u00e5 grund af netv\u00e6rksfejl samt besv\u00e6rliggjorde implementeringen af EDNS-baserede funktioner, s\u00e5som brugen af DNS Cookies til at beskytte mod DDoS-angreb. <\/p>\n<p>Det n\u00e6ste \u00e5r er det besluttet at afholde et arrangement <noindex><a rel=\"nofollow\" href=\"https:\/\/dnsflagday.net\/2020\/\">DNS flag day 2020<\/a><\/noindex>, der har til form\u00e5l at fokusere opm\u00e6rksomheden p\u00e5 <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-bonica-intarea-frag-fragile-03\">l\u00f8sningen<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.potaroo.net\/ispcol\/2017-08\/xtn-hdrs.html\">problemer<\/a><\/noindex> om IP-fragmentering ved behandling af store DNS-beskeder. I rammerne af initiativet <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.dns-oarc.net\/pipermail\/dns-operations\/2019-May\/018721.htm\">er planlagt<\/a><\/noindex>  fastsl\u00e5 de anbefalede bufferst\u00f8rrelser for EDNS til niveauer p\u00e5 1200 byte samt  <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/dns-violations\/dnsflagday\/issues\/89\">at g\u00f8re<\/a><\/noindex> behandling af foresp\u00f8rgsler over TCP som obligatorisk underst\u00f8ttet p\u00e5 serverne. I \u00f8jeblikket er st\u00f8tte til behandling af foresp\u00f8rgsler over UDP obligatorisk, mens TCP er \u00f8nskeligt, men ikke obligatorisk for driften (standarden foreskriver muligheden for at deaktivere TCP). Det foresl\u00e5s at fjerne muligheden for at deaktivere TCP fra standarden og standardisere overgangen fra at sende foresp\u00f8rgsler over UDP til at anvende TCP i de tilf\u00e6lde, hvor den fastsatte bufferst\u00f8rrelse for EDNS ikke er tilstr\u00e6kkelig.<\/p>\n<p>De foresl\u00e5ede \u00e6ndringer vil fjerne forvirringen omkring valg af EDNS-bufferst\u00f8rrelse og l\u00f8se problemet med fragmentering af store UDP-beskeder, hvis behandling ofte f\u00f8rer til tab af pakker og timeout p\u00e5 klientens side. P\u00e5 klientsiden vil EDNS-bufferst\u00f8rrelsen v\u00e6re konstant, og store svar vil straks blive sendt til klienten via TCP. Undtagelsen for at sende store beskeder via UDP vil ogs\u00e5 muligg\u00f8re blokering <noindex><a rel=\"nofollow\" href=\"https:\/\/indico.dns-oarc.net\/event\/31\/contributions\/692\/attachments\/660\/1115\/fujiwara-5.pdf\">angreb<\/a><\/noindex> af DNS-cache-forgiftning baseret p\u00e5 manipulation af fragmenterede UDP-pakker (ved fragmentering inkluderer det andet fragment ikke overskriften med identificeringen, hvorfor det kan forfalskes, s\u00e5 l\u00e6nge kontrolsummen passer).<\/p>\n<p>I PowerDNS Recursor 4.2 er der taget h\u00f8jde for problemer med store UDP-pakker, og der er sket et skift til at bruge en EDNS-bufferst\u00f8rrelse (edns-outgoing-bufsize) p\u00e5 1232 bytes i stedet for den tidligere anvendte gr\u00e6nse p\u00e5 1680 bytes, hvilket b\u00f8r reducere sandsynligheden for tab af UDP-pakker betydeligt. V\u00e6rdien 1232 er valgt, da den er maksimum, hvor DNS-svarst\u00f8rrelsen under hensyntagen til IPv6 passer inden for den minimale MTU-v\u00e6rdi (1280). V\u00e6rdien for parameteren truncation-threshold, som styrer besk\u00e6ringen af svar til klienten, er ogs\u00e5 reduceret til 1232.<\/p>\n<p>Andre \u00e6ndringer i PowerDNS Recursor 4.2:<\/p>\n<ul>\n<li class=\"l\"> Tilf\u00f8jet support for mekanismen <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-bellis-dnsop-xpf-04\">XPF<\/a><\/noindex> (X-Proxied-For), der fungerer som en \u00e6kvivalent til HTTP-headeren X-Forwarded-For for DNS, som muligg\u00f8r overf\u00f8rsel af oplysninger om IP-adressen og portnummeret fra den oprindelige initiator af anmodningen, der omdirigeres gennem mellemliggende proxyer og load balancere (f.eks. dnsdist). For at aktivere XPF er der muligheder &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/doc.powerdns.com\/recursor\/settings.html#xpf-allow-from\">xpf-allow-from<\/a><\/noindex>&#187; og &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/doc.powerdns.com\/recursor\/settings.html#xpf-rr-code\">xpf-rr-code<\/a><\/noindex>&#171;;\n<li class=\"l\"> Forbedret support til EDNS-udvidelsen <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc7871.html\">Client Subnet<\/a><\/noindex> (ECS), der g\u00f8r det muligt at overf\u00f8re oplysninger om det subnet, som den oprindelige anmodning blev sendt fra, til en autoritativ DNS-server i DNS-anmodninger (data om klientens oprindelige subnet er n\u00f8dvendige for effektiv drift af indholdsleveringsnetv\u00e6rk). I den nye udgave er der tilf\u00f8jet indstillinger for selektiv kontrol af anvendelsen af EDNS Client Subnet: &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/doc.powerdns.com\/recursor\/settings.html#ecs-add-for\">ecs-add-for<\/a><\/noindex>&#187; med en liste over netv\u00e6rksmasker, for hvilke IP'en vil blive brugt i ECS i udg\u00e5ende anmodninger. For adresser, der ikke falder ind under de angivne masker, vil den generelle adresse angivet i direktivet &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/doc.powerdns.com\/recursor\/settings.html#ecs-scope-zero-address\">ecs-scope-zero-address<\/a><\/noindex>&#171;. Gennem direktivet &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/doc.powerdns.com\/recursor\/settings.html#use-incoming-edns-subnet\">use-incoming-edns-subnet<\/a><\/noindex>&#187; kan der bestemmes subnet, hvor indg\u00e5ende anmodninger med udfyldte ECS-v\u00e6rdier ikke vil blive erstattet;\n<li class=\"l\"> For servere, der behandler et stort antal anmodninger pr. sekund (mere end 100.000), er der foresl\u00e5et et direktiv &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/doc.powerdns.com\/recursor\/settings.html#distributor-threads\">distributor-threads<\/a><\/noindex>&#171;, der definerer antallet af tr\u00e5de til modtagelse af indg\u00e5ende anmodninger og deres fordeling mellem arbejds-tr\u00e5de (giver kun mening ved brug af tilstanden &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/doc.powerdns.com\/recursor\/settings.html#pdns-distributes-queries\">pdns-distributes-queries=yes<\/a><\/noindex>&#171;).\n<li class=\"l\"> Tilf\u00f8jet indstilling <noindex><a rel=\"nofollow\" href=\"https:\/\/doc.powerdns.com\/recursor\/settings.html#public-suffix-list-file\">public-suffix-list-file<\/a><\/noindex> til at definere sin egen fil med <noindex><a rel=\"nofollow\" href=\"https:\/\/publicsuffix.org\/\">listen over offentlige suffikser<\/a><\/noindex> af dom\u00e6ner, hvor brugere kan registrere deres underdom\u00e6ner i stedet for den indbyggede liste i PowerDNS Recursor.\n<\/ul>\n<p>PowerDNS-projektet har ogs\u00e5 annonceret overgangen til en seks-m\u00e5neders udviklingscyklus, hvor den n\u00e6ste store version af PowerDNS Recursor 4.3 forventes i januar 2020. Opdateringer til betydelige udgivelser vil blive dannet i l\u00f8bet af \u00e5ret, hvorefter der vil blive udgivet sikkerhedsrettelser i yderligere seks m\u00e5neder. Dermed vil supporten for versionen PowerDNS Recursor 4.2 str\u00e6kke sig til januar 2021. Tilsvarende \u00e6ndringer i udviklingscyklussen er blevet vedtaget for produktet PowerDNS Authoritative Server, hvis version 4.2 forventes snart.<\/p>\n<p>Hovedfunktionerne i PowerDNS Recursor:<\/p>\n<ul>\n<li class=\"l\"> V\u00e6rkt\u00f8jer til fjernindhentning af statistikker;\n<li class=\"l\"> \u00d8jeblikkelig genstart;\n<li class=\"l\"> Indbygget motor til tilslutning af h\u00e5ndteringsprogrammer p\u00e5 Lua-sprog;\n<li class=\"l\"> Fuldt support for DNSSEC og <noindex><a rel=\"nofollow\" href=\"https:\/\/doc.powerdns.com\/recursor\/dns64.html\">DNS64<\/a><\/noindex>;\n<li class=\"l\"> Support for RPZ (Response Policy Zones) og mulighed for at definere sortlister;\n<li class=\"l\"> Mekanismer til at bek\u00e6mpe spoofing;\n<li class=\"l\"> Mulighed for at gemme resultaterne af opl\u00f8sning som BIND zonefiler.\n<li class=\"l\"> For at sikre h\u00f8j ydeevne anvendes moderne mekanismer til multiplexing af forbindelser i FreeBSD, Linux og Solaris (kqueue, epoll, \/dev\/poll), samt en h\u00f8jtydende DNS-pakker-parser, der kan h\u00e5ndtere titusinder af parallelle foresp\u00f8rgsler.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Kilde: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51102\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u043f\u043e\u043b\u0443\u0442\u043e\u0440\u0430 \u043b\u0435\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u043a\u044d\u0448\u0438\u0440\u0443\u044e\u0448\u0435\u0433\u043e DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 PowerDNS Recursor 4.2, \u043e\u0442\u0432\u0435\u0447\u0430\u044e\u0449\u0435\u0433\u043e \u0437\u0430 \u0440\u0435\u043a\u0443\u0440\u0441\u0438\u0432\u043d\u043e\u0435 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0438\u043c\u0451\u043d. PowerDNS Recursor \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d \u043d\u0430 \u043e\u0434\u043d\u043e\u0439 \u043a\u043e\u0434\u043e\u0432\u043e\u0439 \u0431\u0430\u0437\u0435 \u0441 PowerDNS Authoritative Server, \u043d\u043e \u0440\u0435\u043a\u0443\u0440\u0441\u0438\u0432\u043d\u044b\u0439 \u0438 \u0430\u0432\u0442\u043e\u0440\u0438\u0442\u0435\u0442\u043d\u044b\u0439 DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u044b PowerDNS \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0442\u0441\u044f \u0432 \u0440\u0430\u043c\u043a\u0430\u0445 \u0440\u0430\u0437\u043d\u044b\u0445 \u0446\u0438\u043a\u043b\u043e\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0438 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u044e\u0442\u0441\u044f \u0432 \u0444\u043e\u0440\u043c\u0435 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u043f\u0440\u043e\u0434\u0443\u043a\u0442\u043e\u0432. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 GPLv2. \u0412 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b [&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-36194","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=\"\u041f\u043e\u0441\u043b\u0435 \u043f\u043e\u043b\u0443\u0442\u043e\u0440\u0430 \u043b\u0435\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 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