{"id":274,"date":"2014-01-27T09:03:19","date_gmt":"2014-01-27T08:03:19","guid":{"rendered":"http:\/\/wordpress.altharis.net\/index.php\/2014\/01\/27\/fail2ban-ban-permanent-d-une-ip-avec-iptable\/"},"modified":"2019-01-24T10:46:04","modified_gmt":"2019-01-24T09:46:04","slug":"fail2ban-ban-permanent-d-une-ip-avec-iptable","status":"publish","type":"post","link":"https:\/\/altharis.net\/index.php\/fail2ban-ban-permanent-d-une-ip-avec-iptable\/","title":{"rendered":"Fail2ban, ban permanent d&rsquo;une IP avec Iptable"},"content":{"rendered":"<p style=\"text-align: center;\">Fail2ban, ban permanent d&rsquo;une IP avec Iptable<\/p>\n<p><span style=\"font-size: 12pt; font-family: 'comic sans ms', sans-serif; color: #008080;\">Fail2ban, cet outil magique pour analyser vos logs et ex\u00e9cuter des commandes en fonction de ce que vous d\u00e9cidez.<\/span><\/p>\n<p><!--more--><\/p>\n<p><span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">Il est capable d&rsquo;effectuer une infinit\u00e9 d&rsquo;actions en fonction de ce qui se passe dans vos logs et selon votre bon vouloir. Surveillance de SSH, de Apache, de postfix, etc&#8230; il sait tout faire, si on lui apprend bien&#8230;<\/span><br \/>\n<span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">Je ne vais pas vous indiquer comment celui-ci fonctionne.<\/span><br \/>\n<span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">Je suppose que si vous \u00eates ici c&rsquo;est que vous avez d\u00e9j\u00e0 une mouture fonctionnelle de la b\u00eate.<\/span><\/p>\n<h5><span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">On va juste un chouia optimiser le bousin.<\/span><\/h5>\n<p><span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">Alors c&rsquo;est parti.<\/span><br \/>\n<span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">Ce qu&rsquo;il faut retenir c&rsquo;est que \u00ab\u00a0F2B\u00a0\u00bb agit en fonction des scripts que vous avez d\u00e9finis, ce sont vos: \u00ab\u00a0jail\u00a0\u00bb (prisons)<\/span><br \/>\n<span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">Si votre \u00ab\u00a0jail\u00a0\u00bb est bien configur\u00e9e, alors \u00e7a donne sommairement:<\/span><\/p>\n<p><span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">Tentative d&rsquo;intrusion =&gt; trace dans les logs =&gt; lecture du log par F2B =&gt; identification du type d&rsquo;intrusion dans vos \u00ab\u00a0Jails\u00a0\u00bb =&gt; contre-mesure d\u00e9finie dans les actions de F2B.<\/span><\/p>\n<p><span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">On va du coup consid\u00e9rer que tout ce petit monde fonctionne correctement sur votre serveur, et on ne va s&rsquo;int\u00e9resser qu&rsquo;\u00e0 la derni\u00e8re section.<\/span><br \/>\n<span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">Les contre-mesures d\u00e9finies par d\u00e9faut dans:<\/span><\/p>\n<p><span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">iptables-multiport.conf<\/span><\/p>\n<h5><span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">On cherche la section actionban:<\/span><\/h5>\n<p><span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">C&rsquo;est l\u00e0 o\u00f9 l&rsquo;action de bannir ce produit avec un beau drop de l&rsquo;IP via IPtable.<\/span><br \/>\n<span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">On va juste lui coller une petite ligne suppl\u00e9mentaire qui va coller l&rsquo;IP dans un fichier texte de son choix ici \u00ab\u00a0ip.ban\u00a0\u00bb<\/span><\/p>\n<p><span style=\"color: #333333; font-size: 10pt;\"><strong><em><span style=\"font-family: 'comic sans ms', sans-serif;\">actionban = iptables -I fail2ban-&lt;name&gt; 1 -s &lt;ip&gt; -j DROP<\/span><\/em><\/strong><\/span><br \/>\n<span style=\"color: #333333; font-size: 10pt;\"><strong><em><span style=\"font-family: 'comic sans ms', sans-serif;\"> echo &lsquo;&lt;ip&gt;&rsquo; &gt;&gt; \/chemin\/du_fichier\/ip.ban<\/span><\/em><\/strong><\/span><br \/>\n<span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">On se retrouve donc avec un beau fichier qui contient la liste compl\u00e8te des IP bannies par F2B.<\/span><br \/>\n<span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">Ce qui nous manque maintenant c&rsquo;est l&rsquo;importation de cette liste dans Iptable.<\/span><\/p>\n<p><span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">On va se rendre, pour ce faire, dans la section actionstart de ce m\u00eame fichier.<\/span><br \/>\n<span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">C&rsquo;est ici que sont d\u00e9finies les actions que le Daemon F2B effectue \u00e0 son lancement.<\/span><br \/>\n<span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">On va lui coller une ligne suppl\u00e9mentaire afin qu&rsquo;il lise notre fichier \u00ab\u00a0ip.ban\u00a0\u00bb a chacun de ses lancements, et l&rsquo;ajoute en banni dans Iptable.<\/span><\/p>\n<p><span style=\"color: #333333;\"><strong><span style=\"font-size: 10pt;\"><em><span style=\"font-family: 'comic sans ms', sans-serif;\">actionstart = iptables -N fail2ban-&lt;name&gt;<\/span><\/em><\/span><\/strong><\/span><br \/>\n<span style=\"color: #333333;\"><strong><span style=\"font-size: 10pt;\"><em><span style=\"font-family: 'comic sans ms', sans-serif;\"> iptables -A fail2ban-&lt;name&gt; -j RETURN<\/span><\/em><\/span><\/strong><\/span><br \/>\n<span style=\"color: #333333;\"><strong><span style=\"font-size: 10pt;\"><em><span style=\"font-family: 'comic sans ms', sans-serif;\"> iptables -I INPUT -p &lt;protocol&gt; -m multiport &#8211;dports &lt;port&gt; -j fail2ban-&lt;name&gt;<\/span><\/em><\/span><\/strong><\/span><br \/>\n<span style=\"color: #333333;\"><strong><span style=\"font-size: 10pt;\"><em><span style=\"font-family: 'comic sans ms', sans-serif;\"> cat \/chemin\/du_fichier\/ip.ban | while read IP; do iptables -I fail2ban-&lt;name&gt; 1 -s $IP -j DROP; done<\/span><\/em><\/span><\/strong><\/span><\/p>\n<p><span style=\"font-family: 'comic sans ms', sans-serif; font-size: 12pt; color: #008080;\">Et maintenant, vous voil\u00e0 avec un beau fichier contenant la liste des IP ind\u00e9sirables, qui se retrouvent bannis a chaque lancement du daemon de F2B par Iptable.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fail2ban, ban permanent d&rsquo;une IP avec Iptable Fail2ban, cet outil magique pour analyser vos logs et ex\u00e9cuter des commandes en fonction de ce que vous d\u00e9cidez.<\/p>\n","protected":false},"author":1,"featured_media":359,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3],"tags":[739,741,738,737,740],"class_list":["post-274","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trucs-astuces","tag-ban-permanent","tag-blacklist","tag-f2b","tag-fail2ban","tag-iptable"],"yoast_head":"<!-- This site is optimized with the 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