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# Fail2Ban filter Dovecot authentication and pop3/imap/managesieve server
# guilhem 2020-05-19: This is the filter from Buster (fail2ban
# 0.10.2-2.1) with managesieve to the list of protected services
#
[INCLUDES]
before = common.conf
[Definition]
_auth_worker = (?:dovecot: )?auth(?:-worker)?
_daemon = (?:dovecot(?:-auth)?|auth)
prefregex = ^%(__prefix_line)s(?:%(_auth_worker)s(?:\([^\)]+\))?: )?(?:%(__pam_auth)s(?:\(dovecot:auth\))?: |(?:pop3|imap|managesieve)-login: )?(?:Info: )?<F-CONTENT>.+</F-CONTENT>$
failregex = ^authentication failure; logname=\S* uid=\S* euid=\S* tty=dovecot ruser=\S* rhost=<HOST>(?:\s+user=\S*)?\s*$
^(?:Aborted login|Disconnected)(?::(?: [^ \(]+)+)? \((?:auth failed, \d+ attempts(?: in \d+ secs)?|tried to use (?:disabled|disallowed) \S+ auth)\):(?: user=<[^>]*>,)?(?: method=\S+,)? rip=<HOST>(?:[^>]*(?:, session=<\S+>)?)\s*$
^pam\(\S+,<HOST>(?:,\S*)?\): pam_authenticate\(\) failed: (?:User not known to the underlying authentication module: \d+ Time\(s\)|Authentication failure \(password mismatch\?\)|Permission denied)\s*$
^[a-z\-]{3,15}\(\S*,<HOST>(?:,\S*)?\): (?:unknown user|invalid credentials)\s*$
<mdre-<mode>>
mdre-aggressive = ^(?:Aborted login|Disconnected)(?::(?: [^ \(]+)+)? \((?:no auth attempts|disconnected before auth was ready,|client didn't finish \S+ auth,)(?: (?:in|waited) \d+ secs)?\):(?: user=<[^>]*>,)?(?: method=\S+,)? rip=<HOST>(?:[^>]*(?:, session=<\S+>)?)\s*$
mdre-normal =
# Parameter `mode` - `normal` or `aggressive`.
# Aggressive mode can be used to match log-entries like:
# 'no auth attempts', 'disconnected before auth was ready', 'client didn't finish SASL auth'.
# Note it may produce lots of false positives on misconfigured MTAs.
# Ex.:
# filter = dovecot[mode=aggressive]
mode = normal
ignoreregex =
journalmatch = _SYSTEMD_UNIT=dovecot.service
datepattern = {^LN-BEG}TAI64N
{^LN-BEG}
# DEV Notes:
# * the first regex is essentially a copy of pam-generic.conf
# * Probably doesn't do dovecot sql/ldap backends properly (resolved in edit 21/03/2016)
#
# Author: Martin Waschbuesch
# Daniel Black (rewrote with begin and end anchors)
# Martin O'Neal (added LDAP authentication failure regex)
# Sergey G. Brester aka sebres (reviewed, optimized, IPv6-compatibility)
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