{"id":2297,"date":"2021-02-17T11:22:00","date_gmt":"2021-02-17T10:22:00","guid":{"rendered":"https:\/\/www.nico-maas.de\/?p=2297"},"modified":"2021-02-11T11:28:41","modified_gmt":"2021-02-11T10:28:41","slug":"fail2ban-cheat-sheet","status":"publish","type":"post","link":"https:\/\/www.nico-maas.de\/?p=2297","title":{"rendered":"fail2ban Cheat Sheet"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Just the commands I always need to look up, because I forgot again...<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Overview over fail2ban status and jails<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">fail2ban-client status<\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>See which e.g. IPs are banned for sshd jail<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">fail2ban-client status sshd<\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>Unban an IP from sshd jail<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">fail2ban-client set sshd unbanip IPADDRESSHERE<\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>See which systems are actually banned<\/li><\/ul>\n\n\n\n<pre id=\"block-024d2c47-649e-442b-884a-de6ff2831edb\" class=\"wp-block-preformatted\">zgrep 'Ban' \/var\/log\/fail2ban.log*<\/pre>\n<div class=\"shariff shariff-align-left shariff-widget-align-left\"><ul class=\"shariff-buttons theme-round orientation-horizontal buttonsize-small\"><li class=\"shariff-button printer shariff-nocustomcolor\" style=\"background-color:#a8a8a8\"><a href=\"javascript:window.print()\" title=\"print\" aria-label=\"print\" role=\"button\" rel=\"noopener nofollow\" class=\"shariff-link\" style=\"; 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Overview over fail2ban status and jails fail2ban-client status See which e.g. IPs are banned for sshd jail fail2ban-client status sshd Unban an IP from sshd jail fail2ban-client set sshd unbanip IPADDRESSHERE See which systems are actually banned zgrep 'Ban' \/var\/log\/fail2ban.log*<\/p>\n<div class=\"shariff shariff-align-left shariff-widget-align-left\"><ul class=\"shariff-buttons theme-round orientation-horizontal buttonsize-small\"><li class=\"shariff-button printer shariff-nocustomcolor\" style=\"background-color:#a8a8a8\"><a href=\"javascript:window.print()\" title=\"print\" aria-label=\"print\" role=\"button\" rel=\"noopener nofollow\" class=\"shariff-link\" style=\"; background-color:#999; color:#fff\"><span class=\"shariff-icon\" style=\"\"><svg width=\"32px\" height=\"20px\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 30 32\"><path fill=\"#999\" d=\"M6.8 27.4h16v-4.6h-16v4.6zM6.8 16h16v-6.8h-2.8q-0.7 0-1.2-0.5t-0.5-1.2v-2.8h-11.4v11.4zM27.4 17.2q0-0.5-0.3-0.8t-0.8-0.4-0.8 0.4-0.3 0.8 0.3 0.8 0.8 0.3 0.8-0.3 0.3-0.8zM29.7 17.2v7.4q0 0.2-0.2 0.4t-0.4 0.2h-4v2.8q0 0.7-0.5 1.2t-1.2 0.5h-17.2q-0.7 0-1.2-0.5t-0.5-1.2v-2.8h-4q-0.2 0-0.4-0.2t-0.2-0.4v-7.4q0-1.4 1-2.4t2.4-1h1.2v-9.7q0-0.7 0.5-1.2t1.2-0.5h12q0.7 0 1.6 0.4t1.3 0.8l2.7 2.7q0.5 0.5 0.9 1.4t0.4 1.6v4.6h1.1q1.4 0 2.4 1t1 2.4z\"\/><\/svg><\/span><\/a><\/li><li class=\"shariff-button mailto shariff-nocustomcolor\" style=\"background-color:#a8a8a8\"><a href=\"mailto:?body=https%3A%2F%2Fwww.nico-maas.de%2F%3Fp%3D2297&subject=fail2ban%20Cheat%20Sheet\" title=\"Send by email\" aria-label=\"Send by email\" role=\"button\" rel=\"noopener nofollow\" class=\"shariff-link\" style=\"; 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August 2008","format":false,"excerpt":"One year after the Hilfsdrache Project, I wanted to build an new server. While an traineeship at an IT Systems firm, I got an 19'' Inch Rackpiece with (about 3 HE) - so I wanted to use that as \"Case\" for that project. That server here should be different from\u2026","rel":"","context":"In &quot;Hardware&quot;","block_context":{"text":"Hardware","link":"https:\/\/www.nico-maas.de\/?cat=11"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.nico-maas.de\/wordpress\/wp-content\/uploads\/blutdrache-v1-01.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2287,"url":"https:\/\/www.nico-maas.de\/?p=2287","url_meta":{"origin":2297,"position":1},"title":"[Win10] Offline installation of FoD like OpenSSH Server without VLSC ISO","author":"Nico Maas","date":"11. February 2021","format":false,"excerpt":"Windows 10 comes with a lot of additional options to install, which are not part of the \"local\" installationmedia.That means things like e.g. the OpenSSH Server component. These options are called \"Features on Demand\" (FoD) and do need either an active internet connection to download and install, or a specializied\u2026","rel":"","context":"In &quot;Computer&quot;","block_context":{"text":"Computer","link":"https:\/\/www.nico-maas.de\/?cat=4"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.nico-maas.de\/wordpress\/wp-content\/uploads\/win10_fod_3-1.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.nico-maas.de\/wordpress\/wp-content\/uploads\/win10_fod_3-1.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.nico-maas.de\/wordpress\/wp-content\/uploads\/win10_fod_3-1.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.nico-maas.de\/wordpress\/wp-content\/uploads\/win10_fod_3-1.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":1215,"url":"https:\/\/www.nico-maas.de\/?p=1215","url_meta":{"origin":2297,"position":2},"title":"[Ubuntu] Networked UPS with apcupsd, APC 750 and Windows","author":"Nico Maas","date":"10. May 2016","format":false,"excerpt":"Due to some serious power outages, I had to install an UPS at the Office of one client. It is an rather small setup: One low-power Ubuntu Server, one Laptop with one TFT Screen, one i3 Desktop with two TFT Screens, one network switch. All in all, about 400VA. I\u2026","rel":"","context":"In &quot;Network&quot;","block_context":{"text":"Network","link":"https:\/\/www.nico-maas.de\/?cat=32"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":681,"url":"https:\/\/www.nico-maas.de\/?p=681","url_meta":{"origin":2297,"position":3},"title":"[Samba] Windows Client can't access Unix Samba Share KB2536276","author":"Nico Maas","date":"7. July 2011","format":false,"excerpt":"On 16.06.2011 Microsoft fixed an Security Issue with Samba which ended in Windows Users beeing unable to access Unix Samba Shares by using Plain Text Authentication. By removing Security Update KB2536276 and rebooting you can enable your client again - or you patch your samba server, which is the real\u2026","rel":"","context":"In &quot;Network&quot;","block_context":{"text":"Network","link":"https:\/\/www.nico-maas.de\/?cat=32"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1307,"url":"https:\/\/www.nico-maas.de\/?p=1307","url_meta":{"origin":2297,"position":4},"title":"Gitkraken - your next Git Client","author":"Nico Maas","date":"24. December 2016","format":false,"excerpt":"If you're in the NetOps\/DevOps Teams, chances are high you need to develop code and use git. Well, on Windows Clients, I tended to use Atlassians Source Tree - however, that client became more and more buggy and unstable - unusable to say. Especially if I had to do an\u2026","rel":"","context":"In &quot;Product Specific&quot;","block_context":{"text":"Product Specific","link":"https:\/\/www.nico-maas.de\/?cat=78"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1289,"url":"https:\/\/www.nico-maas.de\/?p=1289","url_meta":{"origin":2297,"position":5},"title":"[Ubuntu] Radsecproy for secure Radius over WAN","author":"Nico Maas","date":"27. June 2016","format":false,"excerpt":"Chances are you going to need an radius Auth over WAN - because your Radius and Identity Mngmnt is hosted in the security of the local datacenter of your corp... but the client (i.e. an network switch) is somewhere over the rainbow WAN. You *could* just pipe the radius traffic\u2026","rel":"","context":"In &quot;Network&quot;","block_context":{"text":"Network","link":"https:\/\/www.nico-maas.de\/?cat=32"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=\/wp\/v2\/posts\/2297","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2297"}],"version-history":[{"count":1,"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=\/wp\/v2\/posts\/2297\/revisions"}],"predecessor-version":[{"id":2298,"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=\/wp\/v2\/posts\/2297\/revisions\/2298"}],"wp:attachment":[{"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2297"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2297"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}