fail2ban/config/filter.d/dovecot.conf

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# Fail2Ban configuration file for dovecot
#
# Author: Martin Waschbuesch
# Daniel Black (rewrote with begin and end anchors)
[INCLUDES]
before = common.conf
[Definition]
_daemon = dovecot(-auth)?
# Option: failregex
# Notes.: regex to match the password failures messages in the logfile.
# first regex is essentially a copy of pam-generic.conf
# Values: TEXT
#
failregex = ^%(__prefix_line)s(pam_unix(\(\S+\))?:)?\s+authentication failure; logname=\S* uid=\S* euid=\S* tty=dovecot ruser=\S* rhost=<HOST>(\s+user=\S*)?\s*$
^%(__prefix_line)s(pop3|imap)-login: (Info: )?(Aborted login|Disconnected)(: Inactivity)? \(((no auth attempts|auth failed, \d+ attempts)( in \d+ secs)?|tried to use disabled \S+ auth)\):( user=<\S*>,)?( method=\S+,)? rip=<HOST>, lip=(\d{1,3}\.){3}\d{1,3}(, session=<\w+>)?(, TLS( handshaking)?(: Disconnected)?)?\s*$
# Option: ignoreregex
# Notes.: regex to ignore. If this regex matches, the line is ignored.
# Values: TEXT
#
ignoreregex =