{"id":52438,"date":"2019-11-08T00:00:00","date_gmt":"2019-11-07T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/udp-flood-ot-google-ili-kak-ne-lishit-vseh-youtube"},"modified":"2020-02-18T14:00:09","modified_gmt":"2020-02-18T11:00:09","slug":"udp-flood-ot-google-ili-kak-ne-lishit-vseh-youtube","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/udp-flood-ot-google-ili-kak-ne-lishit-vseh-youtube","title":{"rendered":"UDP Flood do Google ou como n\u00e3o privar todos do Youtube","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Numa bela noite de primavera, quando eu n\u00e3o queria ir para casa, e o desejo incontrol\u00e1vel de viver e conhecer queimava como ferro em brasa, surgiu a ideia de explorar uma tentadora novidade no firewall chamada \u201c<b>pol\u00edtica de IP DOS<\/b>&#171;.<br \/>\nAp\u00f3s algumas preliminares e me familiarizar com o manual, configurei em modo <b>Pass-and-Log<\/b>, para ver o resultado e a utilidade duvidosa dessa configura\u00e7\u00e3o.<br \/>\nDepois de alguns dias (para que a estat\u00edstica fosse compilada, claro, e n\u00e3o porque eu havia esquecido), olhei os logs e, dan\u00e7ando no lugar, bati palmas \u2014 as entradas se acumularam a um n\u00edvel consider\u00e1vel. \u00c0 primeira vista, parecia simples \u2014 ative a pol\u00edtica em modo bloqueio de todos os flooders, scanners, estabelecendo <b>sess\u00f5es half-open<\/b> com banimento de uma hora e durma tranquilo sabendo que a fronteira est\u00e1 protegida. Mas aos 34 anos de vida, ultrapassei o maximalismo juvenil e, em algum lugar na parte de tr\u00e1s da minha mente, uma vozinha fina falou: \"Por que n\u00e3o abrimos os olhos e vemos quais endere\u00e7os nosso querido firewall identificou como os mais pesados flooders? Apenas por curiosidade.\"<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nCome\u00e7amos a analisar os dados obtidos da lista de anomalias. Passei os endere\u00e7os por um script simples <b>Powershell<\/b> e meus olhos caem em letras conhecidas <b>google<\/b>. <\/p>\n<p><img decoding=\"async\" alt=\"UDP Flood do Google ou como n\u00e3o privar todos do Youtube\" src=\"\/wp-content\/uploads\/2019\/11\/6485a1c1177757e963e047cc72fd1183.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEsfrego os olhos, pisco por cinco minutos, para me certificar de que n\u00e3o estou imaginando \u2014 realmente na lista dos que o firewall considerou como flooders perigosos, o tipo de ataque \u00e9 <b>udp flood<\/b>, endere\u00e7os pertencentes \u00e0 corpora\u00e7\u00e3o do bem. <\/p>\n<p><img decoding=\"async\" alt=\"UDP Flood do Google ou como n\u00e3o privar todos do Youtube\" src=\"\/wp-content\/uploads\/2019\/11\/39bf0ebf156fc1ed1bc1ca4d39c8a1ee.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<img decoding=\"async\" alt=\"UDP Flood do Google ou como n\u00e3o privar todos do Youtube\" src=\"\/wp-content\/uploads\/2019\/11\/d3c25d4403a6cd21a1cd2ac268cb1276.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<img decoding=\"async\" alt=\"UDP Flood do Google ou como n\u00e3o privar todos do Youtube\" src=\"\/wp-content\/uploads\/2019\/11\/7bf6eb74eca2aafa5b627c056a495258.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<img decoding=\"async\" alt=\"UDP Flood do Google ou como n\u00e3o privar todos do Youtube\" src=\"\/wp-content\/uploads\/2019\/11\/3927c2db21f86b120f149936b0c05b41.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nCo\u00e7o a cabe\u00e7a enquanto configuro a captura de pacotes na interface externa para an\u00e1lise posterior. Pensamentos coloridos passam pela minha cabe\u00e7a: \"Como pode algo infectado estar no escopo do Google? E fui eu quem descobriu isso? Isso \u00e9, isso \u00e9 \u2014 pr\u00eamios, honras e o tapete vermelho, e meu pr\u00f3prio cassino com blackjack e, bem, voc\u00ea entendeu\u2026\"<\/p>\n<p>Descompacto o arquivo obtido <b>Wireshark<\/b>-em.<br \/>\nSim, de fato, de um endere\u00e7o do escopo <b>Google <\/b>pacotes UDP est\u00e3o sendo enviados da porta 443 para uma porta aleat\u00f3ria no meu dispositivo. <br \/>\nMas, espere... Aqui o protocolo muda de <b>UDP<\/b> para <b>GQUIC<\/b>. <br \/>\nSemion Semenovich...<\/p>\n<p><img decoding=\"async\" alt=\"UDP Flood do Google ou como n\u00e3o privar todos do Youtube\" src=\"\/wp-content\/uploads\/2019\/11\/b2a4211422fe44014ff88bc087dc1306.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nLembrei imediatamente de uma palestra na <b>HighLoad <\/b><u>Alexander Tobol<\/u> \u00ab<b>UDP<\/b> contra <b>TCP<\/b> ou o futuro da pilha de redes\u201d(<noindex><a rel=\"nofollow\" href=\"https:\/\/www.youtube.com\/watch?v=aXYJlizk3CQ\">link<\/a><\/noindex>).<br \/>\nPor um lado, surge uma leve decep\u00e7\u00e3o \u2014 nem honras, nem gl\u00f3rias. Por outro lado, o problema est\u00e1 claro, resta entender para onde e quanto investigar.<br \/>\nAlguns minutos de conversa com a Corpora\u00e7\u00e3o do Bem - e tudo se coloca no seu devido lugar. Na tentativa de melhorar a velocidade de entrega de conte\u00fado, a empresa <b>Google <\/b>anunciou em 2012 o protocolo <b>QUIC<\/b>, que permite eliminar grande parte das desvantagens do TCP (sim, sim, sim, nestes artigos - <b><noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/QUIC\">Prrr<\/a><\/noindex><\/b> e <b><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infopulse\/blog\/315172\/\">Dois<\/a><\/noindex><\/b> fala-se sobre uma abordagem completamente revolucion\u00e1ria, mas, sejamos sinceros, gostar\u00edamos que as fotos de gatinhos fossem carregadas mais r\u00e1pido, e n\u00e3o todas essas suas revolu\u00e7\u00f5es de consci\u00eancia e progresso). Como demonstrou a pesquisa subsequente, muitas organiza\u00e7\u00f5es est\u00e3o atualmente migrando para essa op\u00e7\u00e3o de entrega de conte\u00fado.<br \/>\nO problema no meu caso e, penso, n\u00e3o s\u00f3 no meu, foi que h\u00e1 um n\u00famero excessivo de pacotes e o firewall os interpreta como flood. <br \/>\nAs op\u00e7\u00f5es de solu\u00e7\u00e3o eram limitadas:<br \/>\n1. Adicionar \u00e0 lista de exce\u00e7\u00f5es para <b>a Pol\u00edtica de DoS<\/b> no firewall, a faixa de endere\u00e7os <b>Google<\/b>. S\u00f3 de pensar na gama de endere\u00e7os poss\u00edveis, meu olho come\u00e7ou a piscar nervosamente \u2014 a ideia foi descartada como absurdidade.<br \/>\n2. Aumentar o limite de ativa\u00e7\u00e3o para <b>a pol\u00edtica de flood UDP<\/b> \u2014 tamb\u00e9m n\u00e3o \u00e9 uma boa op\u00e7\u00e3o, e se algu\u00e9m realmente mal-intencionado passar?<br \/>\n3. Proibir acessos da rede interna para <b>UDP <\/b>para <b>443 <\/b>a porta externa.<br \/>\nAp\u00f3s ler mais sobre a implementa\u00e7\u00e3o e integra\u00e7\u00e3o, <b>QUIC <\/b>em <b>Google Chrome<\/b> a \u00faltima op\u00e7\u00e3o foi escolhida como um curso de a\u00e7\u00e3o. O fato \u00e9 que, amado por todos de maneira implac\u00e1vel (n\u00e3o entendo por qu\u00ea, seria melhor que a cara vermelha do -ov recebesse por giga de RAM consumido), <b>Firefox<\/b>inicialmente tenta estabelecer uma conex\u00e3o usando sua t\u00e9cnica sofrida, <b>Google Chrome<\/b> mas se o milagre n\u00e3o acontece, ele recua para os m\u00e9todos consagrados, embora se envergonhe disso. <b>QUIC<\/b>Criamos uma entrada no firewall para o servi\u00e7o <b>TLS<\/b>Configuramos uma nova regra e a colocamos em algum lugar mais acima na cadeia. <\/p>\n<p>Ap\u00f3s a ativa\u00e7\u00e3o da regra na lista de anomalias, reinou a paz, exceto por infratores realmente maliciosos. <b>QUIC<\/b>:<\/p>\n<p><img decoding=\"async\" alt=\"UDP Flood do Google ou como n\u00e3o privar todos do Youtube\" src=\"\/wp-content\/uploads\/2019\/11\/072de9826cb79d83271f00592b4e0890.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nObrigado a todos pela aten\u00e7\u00e3o.<\/p>\n<p><img decoding=\"async\" alt=\"UDP Flood do Google ou como n\u00e3o privar todos do Youtube\" src=\"\/wp-content\/uploads\/2019\/11\/c17fe100fc8edf348169fe926728e4eb.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nRecursos utilizados:<\/p>\n<p><img decoding=\"async\" alt=\"UDP Flood do Google ou como n\u00e3o privar todos do Youtube\" src=\"\/wp-content\/uploads\/2019\/11\/7976de240c0bca21c56e09f584dfac61.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nRelat\u00f3rio de Alexander Toboia<\/p>\n<p><u><b>Descri\u00e7\u00e3o do protocolo QUIC da empresa Infopulse<\/b><\/u><br \/>\n1.<noindex><a rel=\"nofollow\" href=\"https:\/\/www.youtube.com\/watch?v=aXYJlizk3CQ\">KB da Fortinet<\/a><\/noindex><br \/>\n2.<noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infopulse\/blog\/315172\/\">Performance in .NET Core<\/a><\/noindex><br \/>\n3.<noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/QUIC\">Wikipedia<\/a><\/noindex><br \/>\n4. <noindex><a rel=\"nofollow\" href=\"https:\/\/kb.fortinet.com\/kb\/viewContent.do?externalId=FD36529\">Em uma bela noite de primavera, quando ir para casa n\u00e3o era atraente, e uma incontrol\u00e1vel vontade de viver e conhecer ardia como ferro quente, surgiu a ideia de explorar uma atraente funcionalidade no firewall chamada.<\/a><\/noindex><br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/474806\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u0434\u043d\u0438\u043c \u043f\u0440\u0435\u043a\u0440\u0430\u0441\u043d\u044b\u043c \u0432\u0435\u0441\u0435\u043d\u043d\u0438\u043c \u0432\u0435\u0447\u0435\u0440\u043e\u043c, \u043a\u043e\u0433\u0434\u0430 \u0438\u0434\u0442\u0438 \u0434\u043e\u043c\u043e\u0439 \u043d\u0435 \u0445\u043e\u0442\u0435\u043b\u043e\u0441\u044c, \u0430 \u043d\u0435\u0443\u0435\u043c\u043d\u043e\u0435 \u0436\u0435\u043b\u0430\u043d\u0438\u0435 \u0436\u0438\u0442\u044c \u0438 \u043f\u043e\u0437\u043d\u0430\u0432\u0430\u0442\u044c \u0441\u0432\u0435\u0440\u0431\u0438\u043b\u043e \u0438 \u0436\u0433\u043b\u043e \u0430\u043a\u0438 \u043a\u0430\u043b\u0435\u043d\u044b\u043c \u0436\u0435\u043b\u0435\u0437\u043e\u043c, \u0432\u043e\u0437\u043d\u0438\u043a\u043b\u0430 \u0438\u0434\u0435\u044f \u043f\u043e\u043a\u043e\u0432\u044b\u0440\u044f\u0442\u044c \u0437\u0430\u043c\u0430\u043d\u0447\u0438\u0432\u0443\u044e \u043f\u0440\u0438\u0431\u043b\u0443\u0434\u0443 \u0444\u0438\u0447\u0443 \u043d\u0430 \u0444\u0430\u0439\u0440\u0432\u043e\u043b\u0435 \u043f\u043e\u0434 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u0435\u043c &#171;IP DOS policy&#171;. \u041f\u043e\u0441\u043b\u0435 \u043f\u0440\u0435\u0434\u0432\u0430\u0440\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u043b\u0430\u0441\u043e\u043a \u0438 \u043e\u0437\u043d\u0430\u043a\u043e\u043c\u043b\u0435\u043d\u0438\u044f \u0441 \u043c\u0430\u043d\u0443\u0430\u043b\u043e\u043c \u043d\u0430\u0441\u0442\u0440\u043e\u0438\u043b \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 Pass-and-Log, \u0447\u0442\u043e\u0431\u044b \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u0432\u043e\u043e\u0431\u0449\u0435 \u043d\u0430 \u0432\u044b\u0445\u043b\u043e\u043f \u0438 \u0441\u043e\u043c\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u0443\u044e \u043f\u043e\u043b\u0435\u0437\u043d\u043e\u0441\u0442\u044c \u0434\u0430\u043d\u043d\u043e\u0439 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\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":[688],"tags":[],"class_list":["post-52438","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=\"\u041e\u0434\u043d\u0438\u043c \u043f\u0440\u0435\u043a\u0440\u0430\u0441\u043d\u044b\u043c \u0432\u0435\u0441\u0435\u043d\u043d\u0438\u043c \u0432\u0435\u0447\u0435\u0440\u043e\u043c, \u043a\u043e\u0433\u0434\u0430 \u0438\u0434\u0442\u0438 \u0434\u043e\u043c\u043e\u0439 \u043d\u0435 \u0445\u043e\u0442\u0435\u043b\u043e\u0441\u044c, \u0430 \u043d\u0435\u0443\u0435\u043c\u043d\u043e\u0435 \u0436\u0435\u043b\u0430\u043d\u0438\u0435 \u0436\u0438\u0442\u044c \u0438 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