{"id":54351,"date":"2019-12-24T00:00:00","date_gmt":"2019-12-23T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/istoriya-sistemy-domennyh-imen-pervye-dns-servery"},"modified":"2020-02-18T14:02:21","modified_gmt":"2020-02-18T11:02:21","slug":"istoriya-sistemy-domennyh-imen-pervye-dns-servery","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/istoriya-sistemy-domennyh-imen-pervye-dns-servery","title":{"rendered":"Hist\u00f3ria do sistema de nomes de dom\u00ednio: primeiros servidores DNS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Na \u00faltima vez, n\u00f3s <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/479452\/\">come\u00e7amos a contar a hist\u00f3ria do DNS<\/a><\/noindex> \u2014 lembramos de como o projeto come\u00e7ou e quais problemas ele foi projetado para resolver na rede ARPANET. Hoje, vamos falar sobre o primeiro servidor DNS, o BIND.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/480514\/\"><img decoding=\"async\" alt=\"Hist\u00f3ria do sistema de nomes de dom\u00ednio: primeiros servidores DNS\" src=\"\/wp-content\/uploads\/2019\/12\/c1e95bf16c7a3b9481ca75d102ac3edc.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<i>Foto \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flickr.com\/photos\/nhoj\/8856003234\">John Markos O'Neill<\/a><\/noindex> \u2014 CC BY-SA<\/i><\/p>\n<h2>Os primeiros servidores DNS<\/h2>\n<p>\nDepois que, em 1983, Paul Mockapetris e Jon Postel\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc882\">propuseram o conceito<\/a><\/noindex>\u00a0de nomes de dom\u00ednio para a rede ARPANET, ele rapidamente ganhou a aprova\u00e7\u00e3o da comunidade de TI. Um dos primeiros a implement\u00e1-lo na pr\u00e1tica foram os engenheiros da Universidade da Calif\u00f3rnia, em Berkeley. Em 1984, quatro estudantes apresentaram o primeiro servidor DNS \u2014 Berkeley Internet Name Domain (BIND). Eles trabalhavam no \u00e2mbito de uma concess\u00e3o dada pela DARPA (Ag\u00eancia de Projetos de Pesquisa Avan\u00e7ada de Defesa dos EUA).<\/p>\n<p>O sistema desenvolvido pelos alunos da universidade automaticamente convertia nomes DNS em endere\u00e7os IP e vice-versa. Curiosamente, quando seu c\u00f3digo foi carregado no <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/BSD\">BSD<\/a><\/noindex> (sistema de distribui\u00e7\u00e3o de software), os primeiros c\u00f3digos-fonte j\u00e1 tinham o n\u00famero da vers\u00e3o 4.3. Inicialmente, o servidor DNS era usado por funcion\u00e1rios dos laborat\u00f3rios da universidade. At\u00e9 a vers\u00e3o 4.8.3, o desenvolvimento do BIND estava a cargo dos membros do grupo de pesquisa da Universidade de Berkeley \u2014 Computer Systems Research Group (CSRG), mas na segunda metade dos anos 1980, o servidor DNS saiu do ambiente acad\u00eamico \u2014 ele foi entregue a Paul Vixie, da\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Digital_Equipment_Corporation\">DEC<\/a><\/noindex>. Paul lan\u00e7ou as atualiza\u00e7\u00f5es 4.9 e 4.9.1, e depois fundou a Internet Software Consortium (ISC), que desde ent\u00e3o \u00e9 respons\u00e1vel pelo suporte ao BIND. Segundo Paul, todas as vers\u00f5es anteriores se baseavam no c\u00f3digo dos alunos de Berkeley, e nos quinze anos que se passaram, ele esgotou todas as possibilidades de moderniza\u00e7\u00e3o. Portanto, em 2000, o BIND foi reescrito do zero.<\/p>\n<blockquote><p>O servidor BIND inclui v\u00e1rias bibliotecas e componentes que implementam a arquitetura 'cliente-servidor' do DNS e s\u00e3o respons\u00e1veis pela configura\u00e7\u00e3o das fun\u00e7\u00f5es do servidor DNS. O BIND \u00e9 amplamente utilizado, especialmente no Linux, e continua a ser a implementa\u00e7\u00e3o popular do servidor DNS. Isso <noindex><a rel=\"nofollow\" href=\"https:\/\/www.isc.org\/download\/\">uma solu\u00e7\u00e3o<\/a><\/noindex> est\u00e1 instalado em servidores que fornecem suporte \u00e0 <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9A%D0%BE%D1%80%D0%BD%D0%B5%D0%B2%D1%8B%D0%B5_%D1%81%D0%B5%D1%80%D0%B2%D0%B5%D1%80%D1%8B_DNS\">zona raiz<\/a><\/noindex>.<\/p><\/blockquote>\n<p>\nExistem alternativas ao BIND. Por exemplo, o PowerDNS, que vem inclu\u00eddo nas distribui\u00e7\u00f5es Linux. Foi criado por Bert Hubert, da empresa holandesa PowerDNS.COM, e \u00e9 mantido pela comunidade de c\u00f3digo aberto. Em 2005, o PowerDNS foi implementado nos servidores da Funda\u00e7\u00e3o Wikimedia. Essa solu\u00e7\u00e3o tamb\u00e9m \u00e9 utilizada por grandes provedores de nuvem, empresas de telecomunica\u00e7\u00f5es europeias e organiza\u00e7\u00f5es da lista Fortune 500.<\/p>\n<p>BIND e PowerDNS s\u00e3o alguns dos servidores DNS mais populares, mas n\u00e3o os \u00fanicos. Tamb\u00e9m vale a pena mencionar\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/NLnetLabs\/unbound\">Unbound<\/a><\/noindex>,\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Djbdns\">djbdns<\/a><\/noindex> e\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Dnsmasq\">Dnsmasq<\/a><\/noindex>.<\/p>\n<h2>Desenvolvimento do sistema de nomes de dom\u00ednio<\/h2>\n<p>\nAo longo da hist\u00f3ria do DNS, muitas altera\u00e7\u00f5es foram feitas em suas especifica\u00e7\u00f5es. Uma das primeiras e mais importantes atualiza\u00e7\u00f5es\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc1996\">adicionaram<\/a><\/noindex>\u00a0foi a implementa\u00e7\u00e3o dos mecanismos NOTIFY e IXFR em 1996. Eles simplificaram a replica\u00e7\u00e3o de bancos de dados do sistema de nomes de dom\u00ednio entre servidores prim\u00e1rios e secund\u00e1rios. A nova solu\u00e7\u00e3o permitiu a configura\u00e7\u00e3o de notifica\u00e7\u00f5es sobre altera\u00e7\u00f5es em registros DNS. Essa abordagem garantiu a identidade das zonas DNS secund\u00e1rias e prim\u00e1rias, al\u00e9m de economizar tr\u00e1fego \u2014 a sincroniza\u00e7\u00e3o ocorria apenas quando necess\u00e1rio, e n\u00e3o em intervalos fixos.<\/p>\n<p><img decoding=\"async\" alt=\"Hist\u00f3ria do sistema de nomes de dom\u00ednio: primeiros servidores DNS\" src=\"\/wp-content\/uploads\/2019\/12\/f9c27f2dfe738274503bdd95ca32bce5.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Foto \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flickr.com\/photos\/bike\/266453254\">Richard Masoner<\/a><\/noindex> \u2014 CC BY-SA<\/i><\/p>\n<p>Inicialmente, a rede DNS n\u00e3o estava dispon\u00edvel para o p\u00fablico em geral e potenciais problemas de seguran\u00e7a da informa\u00e7\u00e3o n\u00e3o eram uma prioridade durante o desenvolvimento do sistema, mas essa abordagem se mostrou problem\u00e1tica posteriormente. Com o desenvolvimento da internet, vulnerabilidades no sistema come\u00e7aram a ser exploradas \u2014 por exemplo, surgiram ataques como o spoofing de DNS. Nesse caso, o cache dos servidores DNS \u00e9 preenchido com dados que n\u00e3o t\u00eam uma fonte autorizada, redirecionando as solicita\u00e7\u00f5es para servidores maliciosos.<\/p>\n<p>Para resolver o problema, no DNS\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/www.icann.org\/resources\/pages\/dnssec-what-is-it-why-important-2019-03-05-en\">implementaram<\/a><\/noindex>\u00a0as assinaturas criptogr\u00e1ficas para respostas DNS (DNSSEC) \u2014 um mecanismo que permite construir uma cadeia de confian\u00e7a para o dom\u00ednio a partir da zona raiz. Observe que um mecanismo semelhante foi adicionado para a autentica\u00e7\u00e3o de hosts durante a transmiss\u00e3o da zona DNS \u2014 ele recebeu o nome de TSIG.<\/p>\n<p>As modifica\u00e7\u00f5es que simplificaram a replica\u00e7\u00e3o de bancos de dados DNS e corrigiram problemas de seguran\u00e7a foram bem recebidas pela comunidade de TI. Mas houve tamb\u00e9m mudan\u00e7as que foram vistas de forma negativa pela comunidade. Em particular, a transi\u00e7\u00e3o de nomes de dom\u00ednio gratuitos para pagos. E este \u00e9 apenas um exemplo de uma 'guerra' na hist\u00f3ria do DNS. Faremos uma an\u00e1lise mais detalhada sobre isso no pr\u00f3ximo material.<\/p>\n<p><img decoding=\"async\" alt=\"Hist\u00f3ria do sistema de nomes de dom\u00ednio: primeiros servidores DNS\" src=\"\/wp-content\/uploads\/2019\/12\/1f42acb7d2b0e01063a51c01ecc08be6.jpg\" style=\"display:block;margin: 0 auto;\" \/>Na 1cloud, oferecemos o servi\u00e7o \u201c<noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/services\/vps-vds?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=dns2&amp;utm_content=site\">Servidor virtual<\/a><\/noindex>\u201d. Com ele, voc\u00ea pode alugar e configurar um servidor VDS\/VPS remoto em poucos minutos.<br \/>\n<img decoding=\"async\" alt=\"Hist\u00f3ria do sistema de nomes de dom\u00ednio: primeiros servidores DNS\" src=\"\/wp-content\/uploads\/2019\/12\/83e0fdbcbe67addee00c0938949e6f7e.jpg\" style=\"display:block;margin: 0 auto;\" \/>H\u00e1 tamb\u00e9m uma <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/conditions\/referral?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=dns2&amp;utm_content=site\">programa de afiliados<\/a><\/noindex> para todos os usu\u00e1rios. Publique links de refer\u00eancia para o nosso servi\u00e7o e ganhe recompensas por clientes trazidos.<\/p>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/480514\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u0440\u043e\u0448\u043b\u044b\u0439 \u0440\u0430\u0437 \u043c\u044b \u043d\u0430\u0447\u0430\u043b\u0438 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u044b\u0432\u0430\u0442\u044c \u0438\u0441\u0442\u043e\u0440\u0438\u044e DNS \u2014 \u0432\u0441\u043f\u043e\u043c\u043d\u0438\u043b\u0438, \u0441 \u0447\u0435\u0433\u043e \u0441\u0442\u0430\u0440\u0442\u043e\u0432\u0430\u043b \u043f\u0440\u043e\u0435\u043a\u0442, \u0438 \u043a\u0430\u043a\u0438\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0431\u044b\u043b \u043f\u0440\u0438\u0437\u0432\u0430\u043d \u0440\u0435\u0448\u0438\u0442\u044c \u0432 \u0441\u0435\u0442\u0438 ARPANET. \u0421\u0435\u0433\u043e\u0434\u043d\u044f \u043f\u043e\u0433\u043e\u0432\u043e\u0440\u0438\u043c \u043e \u043f\u0435\u0440\u0432\u043e\u043c DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0435 BIND. \u0424\u043e\u0442\u043e \u2014 John Markos O&#8217;Neill \u2014 CC BY-SA \u041f\u0435\u0440\u0432\u044b\u0435 DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u044b \u041f\u043e\u0441\u043b\u0435 \u0442\u043e\u0433\u043e \u043a\u0430\u043a \u0432 1983 \u0433\u043e\u0434\u0443 \u041f\u043e\u043b \u041c\u043e\u043a\u0430\u043f\u0435\u0442\u0440\u0438\u0441 (Paul Mockapetris) \u0438 \u0414\u0436\u043e\u043d \u041f\u043e\u0441\u0442\u0435\u043b (Jon Postel)\u00a0\u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b\u0438 \u043a\u043e\u043d\u0446\u0435\u043f\u0446\u0438\u044e\u00a0\u0434\u043e\u043c\u0435\u043d\u043d\u044b\u0445 [&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":[688],"tags":[],"class_list":["post-54351","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043f\u0440\u043e\u0448\u043b\u044b\u0439 \u0440\u0430\u0437 \u043c\u044b \u043d\u0430\u0447\u0430\u043b\u0438 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u044b\u0432\u0430\u0442\u044c \u0438\u0441\u0442\u043e\u0440\u0438\u044e DNS \u2014 \u0432\u0441\u043f\u043e\u043c\u043d\u0438\u043b\u0438, \u0441 \u0447\u0435\u0433\u043e \u0441\u0442\u0430\u0440\u0442\u043e\u0432\u0430\u043b \u043f\u0440\u043e\u0435\u043a\u0442, \u0438 \u043a\u0430\u043a\u0438\u0435 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