{"id":88,"date":"2016-03-12T11:57:36","date_gmt":"2016-03-12T10:57:36","guid":{"rendered":"http:\/\/blog.overgen.com\/messi89\/?p=88"},"modified":"2016-04-15T23:05:39","modified_gmt":"2016-04-15T22:05:39","slug":"bannir-les-script-kiddies-avec-fail2ban-et-uncomplicated-firewall-ufw","status":"publish","type":"post","link":"https:\/\/blog.overgen.com\/messi89\/linux\/bannir-les-script-kiddies-avec-fail2ban-et-uncomplicated-firewall-ufw\/","title":{"rendered":"Bannir les script-kiddies avec Fail2ban et Uncomplicated Firewall (UFW)"},"content":{"rendered":"<p><a href=\"https:\/\/blog.overgen.com\/messi89\/wp-content\/uploads\/2016\/03\/ufw_fail2ban.png\" rel=\"attachment wp-att-96\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-96 size-full\" src=\"https:\/\/blog.overgen.com\/messi89\/wp-content\/uploads\/2016\/03\/ufw_fail2ban.png\" alt=\"ufw_fail2ban\" width=\"800\" height=\"397\" srcset=\"https:\/\/blog.overgen.com\/messi89\/wp-content\/uploads\/2016\/03\/ufw_fail2ban.png 800w, https:\/\/blog.overgen.com\/messi89\/wp-content\/uploads\/2016\/03\/ufw_fail2ban-300x149.png 300w, https:\/\/blog.overgen.com\/messi89\/wp-content\/uploads\/2016\/03\/ufw_fail2ban-768x381.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<p>Fail2Ban lit les logs de divers services (SSH, Apache, FTP\u2026) \u00e0 la recherche d&rsquo;erreurs d&rsquo;authentification r\u00e9p\u00e9t\u00e9es.<\/p>\n<p>Par d\u00e9faut Fail2Ban utilise Iptables pour bannir les adresses IP ind\u00e9sirables, connaissant la syntaxe utilis\u00e9e par iptables ce n\u2019est pas toujours \u00e9vident \u00e0 comprendre !!!<\/p>\n<p>UWF est un outil de configuration simplifi\u00e9 de Netfilter (framework impl\u00e9mentant un pare-feu au sein du noyau Linux) qui donne une alternative \u00e0 iptables.<\/p>\n<p>Le tutorial d\u2019aujourd\u2019hui a pour but de changer le comportement par d\u00e9faut de Fail2Ban afin de lui permettre d\u2019utiliser UFW pour bannir les adresses IP.<\/p>\n<p><!--more--><\/p>\n<p>Le tutorial suppose que vous avez dej\u00e0 UFW et Fail2Ban, sous Ubuntu vous pouvez les installer avec :<br \/>\n<code><\/code><\/p>\n<pre class=\"lang:vim decode:true \">sudo apt-get install ufw\r\nsudo apt-get install fail2ban<\/pre>\n<p>&nbsp;<\/p>\n<p>Passant \u00e0 la configuration de fail2ban, tout d\u2019abord nous allons copier le fichier \/etc\/fail2ban\/jail.conf et le renomer en jail.local afin d\u2019utiliser ce dernier pour notre configuration :<\/p>\n<pre class=\"lang:vim decode:true\">cp \/etc\/fail2ban\/jail.conf \/etc\/fail2ban\/jail.local<\/pre>\n<p>&nbsp;<\/p>\n<p>Ouvrez le fichier jail.local avec votre \u00e9diteur texte et modifiez :<br \/>\n<code>[DEFAULT]<br \/>\n# les adresses IP ignor\u00e9es<br \/>\nignoreip = 127.0.0.1\/8<br \/>\n#la dur\u00e9e de l\u2019exclusion en seconde<br \/>\nbantime = 1800<br \/>\n#la dur\u00e9e et le nombre de tentative pendant lesquelles une adresse risque d\u2019etre bannis<br \/>\nfindtime = 600<br \/>\nmaxretry = 3<\/code><\/p>\n<p>Ensuite, toujours dans le m\u00eame fichier, nous allons descendre en bas dans la partie Jail, pour activer la surveillance sur le port ssh, si vous avez chang\u00e9 le port ssh n\u2019oubliez pas de le mentionner dans la valeur port :<br \/>\n<code>[ssh]<br \/>\nenabled = true<br \/>\nbanaction = ufw-ssh<br \/>\nport = ssh<br \/>\nfilter = sshd<br \/>\nlogpath = \/var\/log\/auth.log<br \/>\nmaxretry = 5<\/code><\/p>\n<p>M\u00eame chose pour le serveur web apache :<br \/>\n<code>[apache]<br \/>\nenabled = true<br \/>\nbanaction = ufw-apache<br \/>\nport = http,https<br \/>\nfilter = apache-auth<br \/>\nlogpath = \/var\/log\/apache*\/*error.log<br \/>\nmaxretry = 6<\/code><\/p>\n<p><code>[apache-multiport]<br \/>\nenabled = true<br \/>\nbanaction = ufw-apache<br \/>\nport = http,https<br \/>\nfilter = apache-auth<br \/>\nlogpath = \/var\/log\/apache*\/*error.log<br \/>\nmaxretry = 6<\/code><\/p>\n<p><code>[apache-noscript]<br \/>\nenabled = true<br \/>\nbanaction = ufw-apache<br \/>\nport = http,https<br \/>\nfilter = apache-noscript<br \/>\nlogpath = \/var\/log\/apache*\/*error.log<br \/>\nmaxretry = 6<\/code><\/p>\n<p><code>[apache-overflows]<br \/>\nenabled = true<br \/>\nbanaction = ufw-apache<br \/>\nport = http,https<br \/>\nfilter = apache-overflows<br \/>\nlogpath = \/var\/log\/apache*\/*error.log<br \/>\nmaxretry = 2<\/code><\/p>\n<p>Et pour proftpd :<br \/>\n<code>[proftpd]<br \/>\nenabled = true<br \/>\nbanaction = ufw-proftpd<br \/>\nport = ftp,ftp-data,ftps,ftps-data<br \/>\nfilter = proftpd<br \/>\nlogpath = \/var\/log\/proftpd\/proftpd.log<br \/>\nmaxretry = 5<\/code><\/p>\n<p>Maintenant il fait cr\u00e9er les actions de ban d\u00e9finit pr\u00e9c\u00e9demment dans la partie Jail (ufw-ssh, ufw-apache, ufw-proftpd) et les mettre dans :<\/p>\n<pre class=\"lang:vim decode:true \">\/etc\/fail2ban\/action.d<\/pre>\n<p>ufw-ssh.conf :<br \/>\n<code>[Definition]<br \/>\nactionstart =<br \/>\nactionstop =<br \/>\nactioncheck =<br \/>\nactionban = ufw insert 1 deny from to any port 22<br \/>\nactionunban = ufw delete deny from to any port 22<\/code><\/p>\n<p>ufw-apache.conf :<br \/>\n<code>[Definition]<br \/>\nactionstart =<br \/>\nactionstop =<br \/>\nactioncheck =<br \/>\nactionban = ufw insert 1 deny from to any app \"Apache Full\"<br \/>\nactionunban = ufw delete deny from to any app \"Apache Full\"<\/code><\/p>\n<p>ufw-proftpd.conf :<br \/>\n<code>[Definition]<br \/>\nactionstart =<br \/>\nactionstop =<br \/>\nactioncheck =<br \/>\nactionban = ufw insert 1 deny from to any port 21<br \/>\nactionunban = ufw delete deny from to any port 21<\/code><\/p>\n<p>Il faut bien s\u2019assurer que les r\u00e8gles deny sont toujours plac\u00e9es en haut avant toutes les r\u00e8gles allow, et aussi changer le port si cela est n\u00e9cessaire (dans le cas o\u00f9 vous utilisez d\u2019autres port pour le ssh, ftp ou web).<\/p>\n<p>Relancez fail2ban :<\/p>\n<pre class=\"lang:vim decode:true \">sudo fail2ban-client reload<\/pre>\n<p>&nbsp;<\/p>\n<p>Pour v\u00e9rifier si tout va bien tapez :<\/p>\n<pre class=\"lang:vim decode:true \">sudo tail -f \/var\/log\/fail2ban.log<\/pre>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/blog.overgen.com\/messi89\/wp-content\/uploads\/2016\/03\/fail2ban.png\" rel=\"attachment wp-att-90\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-90 size-full\" src=\"https:\/\/blog.overgen.com\/messi89\/wp-content\/uploads\/2016\/03\/fail2ban.png\" alt=\"fail2ban\" width=\"669\" height=\"212\" srcset=\"https:\/\/blog.overgen.com\/messi89\/wp-content\/uploads\/2016\/03\/fail2ban.png 669w, https:\/\/blog.overgen.com\/messi89\/wp-content\/uploads\/2016\/03\/fail2ban-300x95.png 300w\" sizes=\"auto, (max-width: 669px) 100vw, 669px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fail2Ban lit les logs de divers services (SSH, Apache, FTP\u2026) \u00e0 la recherche d&rsquo;erreurs d&rsquo;authentification r\u00e9p\u00e9t\u00e9es. Par d\u00e9faut Fail2Ban utilise Iptables pour bannir les adresses IP ind\u00e9sirables, connaissant la syntaxe utilis\u00e9e par iptables ce n\u2019est pas toujours \u00e9vident \u00e0 comprendre !!! UWF est un outil de configuration simplifi\u00e9 de Netfilter (framework impl\u00e9mentant un pare-feu au [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[17,19,20,22,21,18],"class_list":["post-88","post","type-post","status-publish","format-standard","hentry","category-linux","tag-fail2ban","tag-firewall","tag-linux","tag-monitoring","tag-security","tag-ufw"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Bannir les script-kiddies avec Fail2ban et Uncomplicated Firewall (UFW) ~ Messi89&#039;s blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.overgen.com\/messi89\/linux\/bannir-les-script-kiddies-avec-fail2ban-et-uncomplicated-firewall-ufw\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bannir les script-kiddies avec Fail2ban et Uncomplicated Firewall (UFW) ~ Messi89&#039;s blog\" \/>\n<meta property=\"og:description\" content=\"Fail2Ban lit les logs de divers services (SSH, Apache, FTP\u2026) \u00e0 la recherche d&rsquo;erreurs d&rsquo;authentification r\u00e9p\u00e9t\u00e9es. Par d\u00e9faut Fail2Ban utilise Iptables pour bannir les adresses IP ind\u00e9sirables, connaissant la syntaxe utilis\u00e9e par iptables ce n\u2019est pas toujours \u00e9vident \u00e0 comprendre !!! 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