# Fail2Ban filter Dovecot authentication and pop3/imap server # [INCLUDES] before = common.conf [Definition] _daemon = (auth|dovecot(-auth)?|auth-worker) failregex = ^%(__prefix_line)s(%(__pam_auth)s(\(dovecot:auth\))?:)?\s+authentication failure; logname=\S* uid=\S* euid=\S* tty=dovecot ruser=\S* rhost=(\s+user=\S*)?\s*$ ^%(__prefix_line)s(pop3|imap)-login: (Info: )?(Aborted login|Disconnected)(: Inactivity)? \(((auth failed, \d+ attempts)( in \d+ secs)?|tried to use (disabled|disallowed) \S+ auth)\):( user=<\S*>,)?( method=\S+,)? rip=(, lip=(\d{1,3}\.){3}\d{1,3})?(, TLS( handshaking(: SSL_accept\(\) failed: error:[\dA-F]+:SSL routines:[TLS\d]+_GET_CLIENT_HELLO:unknown protocol)?)?(: Disconnected)?)?(, session=<\S+>)?\s*$ ^%(__prefix_line)s(Info|dovecot: auth\(default\)|auth-worker\(\d+\)): pam\(\S+,\): pam_authenticate\(\) failed: (User not known to the underlying authentication module: \d+ Time\(s\)|Authentication failure \(password mismatch\?\))\s*$ ^%(__prefix_line)sauth-worker\(\d+\): pam\(\S+,\): unknown user\s*$ ignoreregex = [Init] journalmatch = _SYSTEMD_UNIT=dovecot.service # DEV Notes: # * the first regex is essentially a copy of pam-generic.conf # * Probably doesn't do dovecot sql/ldap backends properly # * Removed the 'no auth attempts' log lines from the matches because produces # lots of false positives on misconfigured MTAs making regexp unusable # # Author: Martin Waschbuesch # Daniel Black (rewrote with begin and end anchors)