| Server IP : 172.67.162.67 / Your IP : 216.73.216.222 Web Server : Apache System : Linux vps42439 6.8.0-136-generic #136~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Fri Jul 3 16:29:11 UTC x86_64 User : dh_7hi3h9 ( 6349477) PHP Version : 8.3.30 Disable Function : NONE MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : OFF | Sudo : ON | Pkexec : ON Directory : /etc/fail2ban/filter.d/ |
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# Fail2Ban filter for sendmail authentication failures
#
[INCLUDES]
before = common.conf
[Definition]
_daemon = (?:sendmail|sm-(?:mta|acceptingconnections))
# "\w{14,20}" will give support for IDs from 14 up to 20 characters long
__prefix_line = %(known/__prefix_line)s(?:\w{14,20}: )?
addr = (?:IPv6:<IP6>|<IP4>)
prefregex = ^<F-MLFID>%(__prefix_line)s</F-MLFID><F-CONTENT>.+</F-CONTENT>$
failregex = ^(\S+ )?\[%(addr)s\]( \(may be forged\))?: possible SMTP attack: command=AUTH, count=\d+$
^AUTH failure \(LOGIN\):(?: [^:]+:)? authentication failure: checkpass failed, user=<F-USER>(?:\S+|.*?)</F-USER>, relay=(?:\S+ )?\[%(addr)s\](?: \(may be forged\))?$
ignoreregex =
journalmatch = _SYSTEMD_UNIT=sendmail.service
# DEV Notes:
#
# Author: Daniel Black