{"id":85990,"date":"2020-06-21T01:42:12","date_gmt":"2020-06-20T23:42:12","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/snort-ili-suricata-chast-2-ustanovka-i-pervichnaya-nastrojka-suricata"},"modified":"2020-06-21T01:42:12","modified_gmt":"2020-06-20T23:42:12","slug":"snort-ili-suricata-chast-2-ustanovka-i-pervichnaya-nastrojka-suricata","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/snort-ili-suricata-chast-2-ustanovka-i-pervichnaya-nastrojka-suricata","title":{"rendered":"Snort ou Suricata. Parte 2: instala\u00e7\u00e3o e configura\u00e7\u00e3o inicial do Suricata","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Se acreditarmos nas estat\u00edsticas, o volume de tr\u00e1fego na rede aumenta cerca de 50% a cada ano. Isso resulta em um crescimento da carga sobre o equipamento e, em particular, aumenta as exig\u00eancias de desempenho dos IDS\/IPS. \u00c9 poss\u00edvel comprar hardware especializado caro, mas h\u00e1 uma op\u00e7\u00e3o mais barata: a implementa\u00e7\u00e3o de um dos sistemas de c\u00f3digo aberto. Muitos administradores iniciantes acreditam que instalar e configurar um IPS gratuito \u00e9 bastante complicado. No caso do Suricata, isso n\u00e3o \u00e9 totalmente verdade \u2014 voc\u00ea pode instal\u00e1-lo e come\u00e7ar a repelir ataques t\u00edpicos com um conjunto de regras gratuitas em poucos minutos.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ruvds\/blog\/507234\/\"><img decoding=\"async\" alt=\"Snort ou Suricata. Parte 2: instala\u00e7\u00e3o e configura\u00e7\u00e3o inicial do Suricata\" src=\"\/wp-content\/uploads\/2020\/06\/38b577d1359bfd99ca1f4c7510d8563b.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ruvds\/blog\/506730\/\">Snort ou Suricata. Parte 1: escolhendo um IDS\/IPS gratuito para proteger a rede corporativa<\/a><\/noindex><\/p>\n<h2>Por que precisamos de mais um IPS de c\u00f3digo aberto?<\/h2>\n<p>\nDurante muito tempo, o sistema Snort, considerado o padr\u00e3o, foi desenvolvido desde o final dos anos 90, portanto, originalmente era monothread. Ao longo dos anos, ele adquiriu todos os recursos modernos, como suporte a IPv6, capacidade de an\u00e1lise de protocolos de n\u00edvel de aplicativo ou um m\u00f3dulo de acesso a dados universal. <\/p>\n<p>O motor b\u00e1sico do Snort 2.X aprendeu a trabalhar com m\u00faltiplos n\u00facleos, mas permaneceu monothread e, portanto, n\u00e3o pode aproveitar de forma ideal as vantagens das plataformas de hardware modernas. <\/p>\n<p>O problema foi resolvido na terceira vers\u00e3o do sistema, mas levou tanto tempo para ser desenvolvido que o mercado j\u00e1 tinha uma alternativa multithread criada do zero: o Suricata. Em 2009, seu desenvolvimento come\u00e7ou precisamente como uma alternativa de m\u00faltiplos threads ao Snort, com fun\u00e7\u00f5es IPS inclu\u00eddas desde o in\u00edcio. O c\u00f3digo \u00e9 distribu\u00eddo sob a licen\u00e7a GPLv2, mas os parceiros financeiros do projeto t\u00eam acesso a uma vers\u00e3o fechada do motor. Alguns problemas de escalabilidade nas primeiras vers\u00f5es do sistema surgiram, mas foram rapidamente resolvidos.<\/p>\n<h2>Por que Suricata?<\/h2>\n<p>\nO Suricata possui v\u00e1rios m\u00f3dulos (assim como o Snort): captura, coleta, decodifica\u00e7\u00e3o, detec\u00e7\u00e3o e sa\u00edda. Por padr\u00e3o, o tr\u00e1fego capturado \u00e9 processado em um \u00fanico fluxo at\u00e9 a decodifica\u00e7\u00e3o, embora isso sobrecarregue mais o sistema. Se necess\u00e1rio, os fluxos podem ser divididos nas configura\u00e7\u00f5es e distribu\u00eddos entre os processadores \u2014 o Suricata \u00e9 muito bem otimizado para hardware espec\u00edfico, embora isso j\u00e1 n\u00e3o seja um n\u00edvel de HOWTO para iniciantes. Tamb\u00e9m vale a pena mencionar a presen\u00e7a no Suricata de ferramentas avan\u00e7adas de inspe\u00e7\u00e3o HTTP baseadas na biblioteca HTP. Estas podem tamb\u00e9m ser utilizadas para registrar o tr\u00e1fego sem detec\u00e7\u00e3o. O sistema tamb\u00e9m suporta a decodifica\u00e7\u00e3o de IPv6, incluindo t\u00faneis IPv4-em-IPv6, IPv6-em-IPv6 e outros. <\/p>\n<p>Para interceptar o tr\u00e1fego, podem ser utilizados diferentes interfaces (NFQueue, IPFRing, LibPcap, IPFW, AF_PACKET, PF_RING), e no modo Unix Socket \u00e9 poss\u00edvel analisar automaticamente os arquivos PCAP capturados por outro sniffer. Al\u00e9m disso, a arquitetura modular do Suricata facilita a adi\u00e7\u00e3o de novos elementos para captura, decodifica\u00e7\u00e3o, an\u00e1lise e processamento de pacotes de rede. \u00c9 importante tamb\u00e9m notar que, no Suricata, a bloquea\u00e7\u00e3o de tr\u00e1fego \u00e9 realizada por meio do filtro padr\u00e3o do sistema operacional. No GNU\/Linux, existem duas op\u00e7\u00f5es para o funcionamento do IPS: atrav\u00e9s da fila NFQUEUE (modo NFQ) e atrav\u00e9s de zero copy (modo AF_PACKET). No primeiro caso, o pacote que entra no iptables \u00e9 enviado para a fila NFQUEUE, onde pode ser processado em n\u00edvel de usu\u00e1rio. O Suricata verifica suas regras e emite um dos tr\u00eas veredictos: NF_ACCEPT, NF_DROP e NF_REPEAT. Os dois primeiros n\u00e3o requerem explica\u00e7\u00f5es, enquanto o \u00faltimo permite que pacotes sejam marcados e enviados para o in\u00edcio da tabela atual do iptables. O modo AF_PACKET se destaca por sua maior velocidade, mas imp\u00f5e algumas limita\u00e7\u00f5es ao sistema: ele deve ter duas interfaces de rede e operar como um gateway. O pacote bloqueado simplesmente n\u00e3o \u00e9 enviado para a segunda interface. <\/p>\n<p>Uma importante caracter\u00edstica do Suricata \u00e9 a capacidade de usar as regras desenvolvidas para o Snort. O administrador tem acesso, entre outras coisas, a conjuntos de regras do Sourcefire VRT e do OpenSource Emerging Threats, bem como \u00e0s comerciais Emerging Threats Pro. A sa\u00edda unificada pode ser analisada usando backends populares, e tamb\u00e9m oferece suporte \u00e0 sa\u00edda em PCAP e Syslog. As configura\u00e7\u00f5es do sistema e as regras s\u00e3o armazenadas em arquivos no formato YAML, que \u00e9 facilmente leg\u00edvel e pode ser processado automaticamente. O motor Suricata reconhece v\u00e1rios protocolos, portanto, n\u00e3o h\u00e1 necessidade de vincular as regras a um n\u00famero de porta. Al\u00e9m disso, as regras do Suricata aplicam ativamente o conceito de flowbits. Para rastreamento de ativa\u00e7\u00e3o, s\u00e3o utilizadas vari\u00e1veis de sess\u00e3o, permitindo criar e aplicar diferentes contadores e flags. Muitos IDS consideram diferentes conex\u00f5es TCP como entidades separadas e podem n\u00e3o perceber a rela\u00e7\u00e3o entre elas, que indica o in\u00edcio de um ataque. O Suricata busca ver o quadro completo e, em muitos casos, reconhece o tr\u00e1fego malicioso distribu\u00eddo em diferentes conex\u00f5es. Poder\u00edamos discutir suas vantagens por muito tempo, mas vamos nos concentrar na instala\u00e7\u00e3o e configura\u00e7\u00e3o.<\/p>\n<h2>Como instalar?<\/h2>\n<p>\nVamos instalar o Suricata em um servidor virtual que est\u00e1 executando o Ubuntu 18.04 LTS. Todos os comandos devem ser executados como superusu\u00e1rio (root). A op\u00e7\u00e3o mais segura \u00e9 conectar-se ao servidor via SSH com um usu\u00e1rio comum e, em seguida, usar a ferramenta sudo para elevar privil\u00e9gios. Para come\u00e7ar, precisamos instalar os pacotes de que iremos precisar:<\/p>\n<pre><code class=\"bash\">sudo apt -y install libpcre3 libpcre3-dev build-essential autoconf automake libtool libpcap-dev libnet1-dev libyaml-0-2 libyaml-dev zlib1g zlib1g-dev libmagic-dev libcap-ng-dev libjansson-dev pkg-config libnetfilter-queue-dev geoip-bin geoip-database geoipupdate apt-transport-https<\/code><\/pre>\n<p>\nConectando ao reposit\u00f3rio externo:<\/p>\n<pre><code class=\"bash\">sudo add-apt-repository ppa:oisf\/suricata-stable\nsudo apt-get update<\/code><\/pre>\n<p>\nInstalando a vers\u00e3o est\u00e1vel mais recente do Suricata:<\/p>\n<pre><code class=\"bash\">sudo apt-get install suricata<\/code><\/pre>\n<p>\nSe necess\u00e1rio, ajustamos os arquivos de configura\u00e7\u00e3o, trocando o nome padr\u00e3o eth0 pelo nome real da interface externa do servidor. As configura\u00e7\u00f5es padr\u00e3o est\u00e3o armazenadas no arquivo \/etc\/default\/suricata, enquanto as personalizadas est\u00e3o em \/etc\/suricata\/suricata.yaml. A configura\u00e7\u00e3o do IDS \u00e9 em grande parte limitada \u00e0 edi\u00e7\u00e3o deste arquivo de configura\u00e7\u00e3o. Ele cont\u00e9m muitos par\u00e2metros que, em nome e prop\u00f3sito, correspondem aos an\u00e1logos do Snort. O sintaxe, no entanto, \u00e9 completamente diferente, mas o arquivo \u00e9 muito mais f\u00e1cil de ler do que as configura\u00e7\u00f5es do Snort, al\u00e9m de ser bem comentado.<\/p>\n<pre><code class=\"bash\">sudo nano \/etc\/default\/suricata<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Snort ou Suricata. Parte 2: instala\u00e7\u00e3o e configura\u00e7\u00e3o inicial do Suricata\" src=\"\/wp-content\/uploads\/2020\/06\/17ae36d4ca58f0347b0b17f5fcb31c7b.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\ne<\/p>\n<pre><code class=\"bash\">sudo nano \/etc\/suricata\/suricata.yaml<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Snort ou Suricata. Parte 2: instala\u00e7\u00e3o e configura\u00e7\u00e3o inicial do Suricata\" src=\"\/wp-content\/uploads\/2020\/06\/d2d39b52920aa2019fd2a3ec74fcab78.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAten\u00e7\u00e3o! Antes de iniciar, deve-se verificar os valores das vari\u00e1veis na se\u00e7\u00e3o vars.<\/p>\n<p>Para concluir a configura\u00e7\u00e3o, ser\u00e1 necess\u00e1rio instalar o suricata-update para atualizar e baixar as regras. Isso \u00e9 bastante simples:<\/p>\n<pre><code class=\"bash\">sudo apt install python-pip\nsudo pip install pyyaml\nsudo pip install &lt;a href=&quot;https:\/\/github.com\/OISF\/suricata-update\/archive\/master.zip&quot;&gt;https:\/\/github.com\/OISF\/suricata-update\/archive\/master.zip&lt;\/a&gt;\nsudo pip install --pre --upgrade suricata-update<\/code><\/pre>\n<p>\nEm seguida, precisamos executar o comando suricata-update para instalar o conjunto de regras Emerging Threats Open:<\/p>\n<pre><code class=\"bash\">sudo suricata-update<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Snort ou Suricata. Parte 2: instala\u00e7\u00e3o e configura\u00e7\u00e3o inicial do Suricata\" src=\"\/wp-content\/uploads\/2020\/06\/e3174089b6a2c67b8db36d2e40c50af9.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPara visualizar a lista de fontes de regras, executamos o seguinte comando:<\/p>\n<pre><code class=\"bash\">sudo suricata-update list-sources<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Snort ou Suricata. Parte 2: instala\u00e7\u00e3o e configura\u00e7\u00e3o inicial do Suricata\" src=\"\/wp-content\/uploads\/2020\/06\/7cded45bf414c2c2e76fc0bb3e1bb65c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAtualizando as fontes de regras:<\/p>\n<pre><code class=\"bash\">sudo suricata-update update-sources<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Snort ou Suricata. Parte 2: instala\u00e7\u00e3o e configura\u00e7\u00e3o inicial do Suricata\" src=\"\/wp-content\/uploads\/2020\/06\/786f46118b87cece96e818c70662e3c4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVisualizamos novamente as fontes atualizadas:<\/p>\n<pre><code class=\"bash\">sudo suricata-update list-sources<\/code><\/pre>\n<p>\nSe necess\u00e1rio, \u00e9 poss\u00edvel ativar as fontes gratuitas dispon\u00edveis:<\/p>\n<pre><code class=\"bash\">sudo suricata-update enable-source ptresearch\/attackdetection\nsudo suricata-update enable-source oisf\/trafficid\nsudo suricata-update enable-source sslbl\/ssl-fp-blacklist<\/code><\/pre>\n<p>\nAp\u00f3s isso, \u00e9 necess\u00e1rio atualizar as regras mais uma vez:<\/p>\n<pre><code class=\"bash\">sudo suricata-update<\/code><\/pre>\n<p>\nA instala\u00e7\u00e3o e configura\u00e7\u00e3o inicial do Suricata no Ubuntu 18.04 LTS pode ser considerada conclu\u00edda. A partir daqui, come\u00e7amos a parte mais interessante: no pr\u00f3ximo artigo, conectaremos o servidor virtual \u00e0 rede do escrit\u00f3rio via VPN e come\u00e7aremos a analisar todo o tr\u00e1fego de entrada e sa\u00edda. Faremos especial aten\u00e7\u00e3o ao bloqueio de ataques DDoS, atividades de malware e tentativas de explora\u00e7\u00e3o de vulnerabilidades em servi\u00e7os acess\u00edveis de redes p\u00fablicas. Para mostrar tudo de forma clara, simularemos ataques dos tipos mais comuns.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"http:\/\/ruvds.com\/ru-rub?utm_source=habr&amp;utm_medium=article&amp;utm_campaign=ek&amp;utm_content=snort-ili-suricata-2\"><img decoding=\"async\" alt=\"Snort ou Suricata. Parte 2: instala\u00e7\u00e3o e configura\u00e7\u00e3o inicial do Suricata\" src=\"\/wp-content\/uploads\/2020\/06\/8911da77f90d8843a2c0da3c1cb1d5b0.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"http:\/\/ruvds.com\/ru-rub?utm_source=habr&amp;utm_medium=article&amp;utm_campaign=ek&amp;utm_content=snort-ili-suricata-2#order\"><img decoding=\"async\" alt=\"Snort ou Suricata. Parte 2: instala\u00e7\u00e3o e configura\u00e7\u00e3o inicial do Suricata\" src=\"\/wp-content\/uploads\/2020\/06\/f9220be24979f78c539e08d755f4257f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ruvds\/blog\/507234\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0415\u0441\u043b\u0438 \u0432\u0435\u0440\u0438\u0442\u044c \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0435, \u043e\u0431\u044a\u0435\u043c \u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u0442\u0440\u0430\u0444\u0438\u043a\u0430 \u0443\u0432\u0435\u043b\u0438\u0447\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e \u043d\u0430 50% \u043a\u0430\u0436\u0434\u044b\u0439 \u0433\u043e\u0434. \u042d\u0442\u043e \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u0440\u043e\u0441\u0442\u0443 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u043d\u0430 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0435 \u0438, \u0432 \u0447\u0430\u0441\u0442\u043d\u043e\u0441\u0442\u0438, \u043f\u043e\u0432\u044b\u0448\u0430\u0435\u0442 \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u044f \u043a \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 IDS\/IPS. \u041c\u043e\u0436\u043d\u043e \u043f\u043e\u043a\u0443\u043f\u0430\u0442\u044c \u0434\u043e\u0440\u043e\u0433\u043e\u0441\u0442\u043e\u044f\u0449\u0435\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0435 \u0436\u0435\u043b\u0435\u0437\u043e, \u043d\u043e \u0435\u0441\u0442\u044c \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u043f\u043e\u0434\u0435\u0448\u0435\u0432\u043b\u0435 \u2014 \u0432\u043d\u0435\u0434\u0440\u0435\u043d\u0438\u0435 \u043e\u0434\u043d\u043e\u0439 \u0438\u0437 \u0441\u0438\u0441\u0442\u0435\u043c \u0441 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u043c \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u043c \u043a\u043e\u0434\u043e\u043c. \u041c\u043d\u043e\u0433\u0438\u0435 \u043d\u0430\u0447\u0438\u043d\u0430\u044e\u0449\u0438\u0435 \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440\u044b \u0441\u0447\u0438\u0442\u0430\u044e\u0442, \u0431\u0443\u0434\u0442\u043e \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0438 \u0441\u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0431\u0435\u0441\u043f\u043b\u0430\u0442\u043d\u0443\u044e IPS [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":85991,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-85990","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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