{"id":34921,"date":"2019-10-31T22:01:17","date_gmt":"2019-10-31T19:01:17","guid":{"rendered":"https:\/\/prohoster.info\/blog\/est-mnenie-tehnologiya-dane-dlya-brauzerov-provalilas\/"},"modified":"2019-10-31T22:01:17","modified_gmt":"2019-10-31T19:01:17","slug":"est-mnenie-tehnologiya-dane-dlya-brauzerov-provalilas","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/est-mnenie-tehnologiya-dane-dlya-brauzerov-provalilas","title":{"rendered":"H\u00e1 uma opini\u00e3o: a tecnologia DANE para navegadores falhou","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Falamos sobre o que \u00e9 a tecnologia DANE para autentica\u00e7\u00e3o de nomes de dom\u00ednio via DNS e por que ela n\u00e3o se popularizou nos navegadores.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/454322\/\"><img decoding=\"async\" alt=\"H\u00e1 uma opini\u00e3o: a tecnologia DANE para navegadores falhou\" src=\"\/wp-content\/uploads\/2019\/06\/61c8c36b748ad8fd0711336e517f9cae.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<i>\/ Unsplash \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/unsplash.com\/photos\/uw_NWjC1mBE\">Paulius Dragunas<\/a><\/noindex><\/i><\/p>\n<h2>O que \u00e9 DANE<\/h2>\n<p>\nAutoridades certificadoras (CA) s\u00e3o organiza\u00e7\u00f5es que <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/blog\/sozdat-ili-kupit-ssl?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=dane&amp;utm_content=site\">lidam com<\/a><\/noindex> a valida\u00e7\u00e3o de credenciais criptogr\u00e1ficas <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/services\/ssl?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=dane&amp;utm_content=site\">de certificados SSL<\/a><\/noindex>. Elas colocam sua assinatura eletr\u00f4nica nelas, confirmando a autenticidade. No entanto, \u00e0s vezes surgem situa\u00e7\u00f5es em que os certificados s\u00e3o emitidos com viola\u00e7\u00f5es. Por exemplo, no ano passado, o Google iniciou um \"processo de revoga\u00e7\u00e3o de confian\u00e7a\" em rela\u00e7\u00e3o aos certificados da Symantec devido \u00e0 sua compromiss\u00e3o (detalhes dessa hist\u00f3ria foram discutidos em nosso blog \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/349382\/\">um<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/350768\/\">dois<\/a><\/noindex>).<\/p>\n<p>Para evitar tais situa\u00e7\u00f5es, h\u00e1 alguns anos, a IETF <noindex><a rel=\"nofollow\" href=\"https:\/\/www.ietfjournal.org\/dane-taking-tls-authentication-to-the-next-level-using-dnssec\/\">come\u00e7ou a desenvolver<\/a><\/noindex> a tecnologia DANE (mas ela n\u00e3o se popularizou nos navegadores \u2014 por que isso aconteceu, falaremos a seguir).<\/p>\n<p>DANE (Autentica\u00e7\u00e3o Baseada em DNS de Entidades Nomeadas) \u00e9 um conjunto de especifica\u00e7\u00f5es que permite usar DNSSEC (Extens\u00f5es de Seguran\u00e7a do Sistema de Nomes) para controlar a validade de certificados SSL. O DNSSEC \u00e9 uma extens\u00e3o para o sistema de nomes de dom\u00ednio que minimiza ataques relacionados \u00e0 substitui\u00e7\u00e3o de endere\u00e7os. Ao usar essas duas tecnologias, o webmaster ou cliente pode consultar um dos operadores de zonas DNS e confirmar a validade do certificado utilizado.<\/p>\n<p>Essencialmente, DANE atua como um certificado autoassinado (garantido pela seguran\u00e7a do DNSSEC) e complementa as fun\u00e7\u00f5es das CAs.<\/p>\n<h2>Como funciona<\/h2>\n<p>\nA especifica\u00e7\u00e3o DANE est\u00e1 descrita em <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc6698\">RFC6698<\/a><\/noindex>. De acordo com o documento, foi adicionado um novo tipo de registro a <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%A2%D0%B8%D0%BF%D1%8B_%D1%80%D0%B5%D1%81%D1%83%D1%80%D1%81%D0%BD%D1%8B%D1%85_%D0%B7%D0%B0%D0%BF%D0%B8%D1%81%D0%B5%D0%B9_DNS\">registros de recursos DNS<\/a><\/noindex> \u2014 TLSA. Ele cont\u00e9m informa\u00e7\u00f5es sobre o certificado transmitido, dimens\u00f5es e tipo de dados transmitidos, bem como os dados em si. O webmaster cria uma impress\u00e3o digital do certificado, assina-a usando DNSSEC e a publica no registro TLSA.<\/p>\n<blockquote><p>O cliente se conecta ao site na Internet e compara seu certificado com a \"c\u00f3pia\" recebida do operador DNS. Se eles coincidirem, o recurso \u00e9 considerado confi\u00e1vel.<\/p><\/blockquote>\n<p>\nNa p\u00e1gina wiki de DANE, est\u00e1 o seguinte exemplo de consulta DNS ao servidor example.org pela porta TCP 443:<\/p>\n<pre><code class=\"xml\">IN TLSA _443._tcp.example.org<\/code><\/pre>\n<p>\nA resposta a essa consulta \u00e9:<\/p>\n<pre><code class=\"xml\"> _443._tcp.example.com. IN TLSA (\n   3 0 0 30820307308201efa003020102020... )\n<\/code><\/pre>\n<p>\nDANE possui v\u00e1rias extens\u00f5es que trabalham com outros registros DNS al\u00e9m do TLSA. A primeira \u00e9 o registro DNS SSHFP para verificar chaves em conex\u00f5es SSH. Isso est\u00e1 descrito em <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc4255\">RFC4255<\/a><\/noindex>,\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc6594\">RFC6594<\/a><\/noindex>\u00a0e\u00a0<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc7479\">RFC7479<\/a><\/noindex>. O segundo \u00e9 o registro OPENPGPKEY para troca de chaves via PGP (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc7929\">RFC7929<\/a><\/noindex>). Finalmente, o terceiro \u00e9 o registro SMIMEA (o padr\u00e3o n\u00e3o est\u00e1 formalizado no RFC, existe apenas <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-dane-smime-16\">um rascunho<\/a><\/noindex>) para a troca criptogr\u00e1fica de chaves via S\/MIME.<\/p>\n<h2>Qual \u00e9 o problema com o DANE<\/h2>\n<p>\nEm meados de maio, ocorreu a confer\u00eancia DNS-OARC (uma organiza\u00e7\u00e3o sem fins lucrativos que trata de quest\u00f5es de seguran\u00e7a, estabilidade e desenvolvimento do sistema de nomes de dom\u00ednio). Em um dos pain\u00e9is, especialistas <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.apnic.net\/2019\/05\/27\/dns-oarc-30-bad-news-for-dane\/\">conclu\u00edram<\/a><\/noindex>, que a tecnologia DANE falhou nos navegadores (pelo menos, na sua implementa\u00e7\u00e3o atual). O participante da confer\u00eancia, Geoff Huston, principal cientista <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Asia-Pacific_Network_Information_Centre\">APNIC<\/a><\/noindex>, de um dos cinco registradores de internet regionais, <noindex><a rel=\"nofollow\" href=\"https:\/\/afaae.com\/germany\/dnssec-dane-chain-for-browsers-is-practically-dead\/\">se referiu<\/a><\/noindex> ao DANE como uma \"tecnologia morta\".<\/p>\n<blockquote><p>Os navegadores populares n\u00e3o suportam a autentica\u00e7\u00e3o de certificados via DANE. No mercado <noindex><a rel=\"nofollow\" href=\"https:\/\/superuser.com\/questions\/1273058\/browser-plugin-enabling-dane-protocol-with-firefox-chrome-or-other-browser\">h\u00e1 plugins espec\u00edficos<\/a><\/noindex>, que revelam a funcionalidade dos registros TLSA, mas seu suporte <noindex><a rel=\"nofollow\" href=\"https:\/\/www.dnssec-validator.cz\/2018-10-16-end-of-support.html\">est\u00e1 gradualmente sendo descontinuado.<\/a><\/noindex>.<\/p><\/blockquote>\n<p>\nOs problemas com a dissemina\u00e7\u00e3o do DANE nos navegadores est\u00e3o relacionados \u00e0 dura\u00e7\u00e3o do processo de valida\u00e7\u00e3o pelo DNSSEC. O sistema precisa realizar c\u00e1lculos criptogr\u00e1ficos para confirmar a autenticidade do certificado SSL e passar por toda a cadeia de servidores DNS (da zona raiz at\u00e9 o dom\u00ednio do host) na primeira conex\u00e3o ao recurso.<\/p>\n<p><img decoding=\"async\" alt=\"H\u00e1 uma opini\u00e3o: a tecnologia DANE para navegadores falhou\" src=\"\/wp-content\/uploads\/2019\/06\/2d57dce196f8f6dac9c79f89f7d7bc15.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>\/ Unsplash \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/unsplash.com\/photos\/gtVrejEGdmM\">Kaley Dykstra<\/a><\/noindex><\/i><\/p>\n<p>Essa desvantagem foi tentada ser corrigida na Mozilla com o mecanismo <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-tls-dnssec-chain-extension-07\">DNSSEC Chain Extension<\/a><\/noindex> para TLS. Ele deveria reduzir o n\u00famero de registros DNS que o cliente precisaria consultar durante a autentica\u00e7\u00e3o. No entanto, surgiram diverg\u00eancias dentro do grupo de desenvolvedores que n\u00e3o puderam ser resolvidas. O projeto foi abandonado, embora tenha sido aprovado pelo IETF em mar\u00e7o de 2018.<\/p>\n<p>Outra raz\u00e3o para a baixa popularidade do DANE \u00e9 a fraca dissemina\u00e7\u00e3o do DNSSEC no mundo \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/stats.labs.apnic.net\/dnssec\">apenas 19% dos recursos<\/a><\/noindex>. Especialistas acreditam que isso n\u00e3o \u00e9 suficiente para uma promo\u00e7\u00e3o ativa do DANE.<\/p>\n<p>\u00c9 mais prov\u00e1vel que a ind\u00fastria se desenvolva em outra dire\u00e7\u00e3o. Em vez de usar DNS para a verifica\u00e7\u00e3o de certificados SSL\/TLS, os players do mercado, ao contr\u00e1rio, promover\u00e3o os protocolos DNS-over-TLS (DoT) e DNS-over-HTTPS (DoH). O \u00faltimo foi mencionado em um de nossos <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/439426\/\">materiais anteriores<\/a><\/noindex> na Habr\u00e9. Eles criptografam e verificam as solicita\u00e7\u00f5es dos usu\u00e1rios ao servidor DNS, impedindo que atacantes substituam dados. No in\u00edcio do ano, o DoT j\u00e1 <noindex><a rel=\"nofollow\" href=\"https:\/\/security.googleblog.com\/2019\/01\/google-public-dns-now-supports-dns-over.html\">implementaram<\/a><\/noindex> no Google para o seu DNS P\u00fablico. Quanto ao DANE \u2014 ser\u00e1 que a tecnologia conseguir\u00e1 'voltar ao jogo' e se tornar realmente popular, teremos que ver no futuro.<\/p>\n<blockquote><p><b>O que mais temos para leitura adicional:<\/b><\/p>\n<p><img decoding=\"async\" alt=\"H\u00e1 uma opini\u00e3o: a tecnologia DANE para navegadores falhou\" src=\"\/wp-content\/uploads\/2019\/06\/6f7a2dcecf5bb98f0e6808550d343521.jpg\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/453326\/\">Como automatizar a gest\u00e3o da infraestrutura de TI \u2014 discutindo tr\u00eas tend\u00eancias<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"H\u00e1 uma opini\u00e3o: a tecnologia DANE para navegadores falhou\" src=\"\/wp-content\/uploads\/2019\/06\/53815bb3b535a4f041c03df97b59c8c2.jpg\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/452958\/\">JMAP \u2014 um protocolo aberto que substituir\u00e1 o IMAP na troca de e-mails<\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"H\u00e1 uma opini\u00e3o: a tecnologia DANE para navegadores falhou\" src=\"\/wp-content\/uploads\/2019\/06\/62b2366e32f3db04c0b217e625e88888.jpg\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/blog\/ekonomiya-na-api?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=jmap&amp;utm_content=blog\">Como economizar usando uma interface de programa\u00e7\u00e3o de aplicativos<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"H\u00e1 uma opini\u00e3o: a tecnologia DANE para navegadores falhou\" src=\"\/wp-content\/uploads\/2019\/06\/0cda9d4071b16d44978d1d8ac38a8c80.jpg\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/blog\/devops-v-razrabotke-oblaka-1cloud?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=jmap&amp;utm_content=blog\">DevOps em servi\u00e7os de nuvem com o exemplo do 1cloud.ru<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"H\u00e1 uma opini\u00e3o: a tecnologia DANE para navegadores falhou\" src=\"\/wp-content\/uploads\/2019\/06\/6455b1a4c3a02fd6a1295dcd1855f6b3.jpg\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/blog\/our-system-architecture-evolution?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=jmap&amp;utm_content=blog\">A evolu\u00e7\u00e3o da arquitetura em nuvem da 1cloud<\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"H\u00e1 uma opini\u00e3o: a tecnologia DANE para navegadores falhou\" src=\"\/wp-content\/uploads\/2019\/06\/32f570bb5171bd23cda18ffc1c058524.jpg\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.facebook.com\/1cloudru\/posts\/2334655376856969\">Como funciona o suporte t\u00e9cnico da 1cloud<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"H\u00e1 uma opini\u00e3o: a tecnologia DANE para navegadores falhou\" src=\"\/wp-content\/uploads\/2019\/06\/aa6a3fa2d5fd4c1f0815165089ea2980.jpg\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.facebook.com\/1cloudru\/posts\/2329624197360087\">Mitos sobre tecnologias em nuvem<\/a><\/noindex><\/p><\/blockquote>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/454322\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u043e\u0432\u043e\u0440\u0438\u043c \u043e \u0442\u043e\u043c, \u0447\u0442\u043e \u0441\u043e\u0431\u043e\u0439 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044f DANE \u0434\u043b\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0434\u043e\u043c\u0435\u043d\u043d\u044b\u0445 \u0438\u043c\u0435\u043d \u043f\u043e DNS \u0438 \u043f\u043e\u0447\u0435\u043c\u0443 \u043e\u043d\u0430 \u043d\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u0448\u0438\u0440\u043e\u043a\u043e\u0433\u043e \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0432 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430\u0445. \/ Unsplash \/ Paulius Dragunas \u0427\u0442\u043e \u0442\u0430\u043a\u043e\u0435 DANE \u0421\u0435\u0440\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0435 \u0446\u0435\u043d\u0442\u0440\u044b (CA) \u2014 \u044d\u0442\u043e \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0437\u0430\u043d\u0438\u043c\u0430\u044e\u0442\u0441\u044f \u0443\u0434\u043e\u0441\u0442\u043e\u0432\u0435\u0440\u0435\u043d\u0438\u0435\u043c \u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u0447\u0435\u0441\u043a\u0438\u0445 SSL-\u0441\u0435\u0440\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0432. \u041e\u043d\u0438 \u0441\u0442\u0430\u0432\u044f\u0442 \u043d\u0430 \u043d\u0438\u0445 \u0441\u0432\u043e\u044e \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u043d\u0443\u044e \u043f\u043e\u0434\u043f\u0438\u0441\u044c, \u043f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0430\u044f \u043f\u043e\u0434\u043b\u0438\u043d\u043d\u043e\u0441\u0442\u044c. \u041e\u0434\u043d\u0430\u043a\u043e \u043f\u043e\u0440\u043e\u0439 \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u044e\u0442 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u0438, 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