# Fail2Ban filter for exim
#
# This includes the rejection messages of exim. For spam and filter
# related bans use the exim-spam.conf
#


[INCLUDES]

# Read common prefixes. If any customizations available -- read them from
# exim-common.local
before = exim-common.conf

[Definition]

failregex = ^%(pid)s %(host_info)ssender verify fail for <\S+>: (?:Unknown user|Unrouteable address|all relevant MX records point to non-existent hosts)\s*$
            ^%(pid)s \w+ authenticator failed for (\S+ )?\(\S+\) \[<HOST>\](:\d+)?( I=\[\S+\](:\d+)?)?: 535 Incorrect authentication data( \(set_id=.*\)|: \d+ Time\(s\))?\s*$
            ^%(pid)s %(host_info)sF=(<>|[^@]+@\S+) rejected RCPT [^@]+@\S+: (relay not permitted|Sender verify failed|Unknown user)\s*$
            ^%(pid)s SMTP protocol synchronization error \([^)]*\): rejected (connection from|"\S+") %(host_info)s(next )?input=".*"\s*$
            ^%(pid)s SMTP call from \S+ \[<HOST>\](:\d+)? (I=\[\S+\](:\d+)? )?dropped: too many nonmail commands \(last was "\S+"\)\s*$
            ^%(pid)s SMTP protocol error in "AUTH \S*(| \S*)" H=(|\S* )(|\(\S*\) )\[<HOST>\](?:\:\d+)? (?:I=\[\S*\]\:\d+ )?AUTH command used when not advertised\s*$
            ^%(pid)s no MAIL in SMTP connection from (|\S* )(|\(\S*\) )\[<HOST>\]\:\d+ I=\[\S*\]\:\d+ D=\d+s(| C=\S*)\s*$
            ^%(pid)s \S+ SMTP connection from (|\S* )(|\(\S*\) )\[<HOST>\]\:\d+ I=\[\S*\]\:\d+ closed by DROP in ACL\s*$

ignoreregex = 

# DEV Notes:
# The %(host_info) defination contains a <HOST> match
#
# SMTP protocol synchronization error \([^)]*\)  <- This needs to be non-greedy
# to void capture beyond ")" to avoid a DoS Injection vulnerabilty as input= is
# user injectable data.
#
# Author: Cyril Jaquier
#         Daniel Black (rewrote with strong regexs)
#         Martin O'Neal (added additional regexs to detect authentication failures, protocol errors, and drops)