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ASSP filter for Fail2ban

Create a new configuration file with the contents below: /etc/fail2ban/filter.d/assp.conf

# Fail2Ban configuration file
# Author: Viktor Ferenczi (python <at-here> cx <dot-here> hu)


# Option:  failregex
# Notes.:  regex to match the SMTP failure messages in the logfile. The
#          host must be matched by a group named "host". The tag "<HOST>" can
#          be used for standard IP/hostname matching and is only an alias for
#          (?:::f{4,6}:)?(?P<host>\S+)
# Values:  TEXT
# Example: Nov-14-09 00:14:50 54090-05322 <> [SMTP Error] 550 5.1.1 User unknown:
failregex = .*? \d{5}-\d{5} <HOST> <.*?> \[SMTP Error\] (.*) 

# Option:  ignoreregex
# Notes.:  regex to ignore. If this regex matches, the line is ignored.
# Values:  TEXT
ignoreregex = 

Add this section to your /etc/fail2ban/jail.conf file:


enabled  = true
port     = smtp,ssmtp
filter   = assp
action   = iptables[name=ASSP, port=25, protocol=tcp]
logpath  = /var/log/assp/maillog.txt

IMPORTANT: Symlink the logs subdirectory of your ASSP installation as /var/log/assp or change the logpath in your jail configuration to point to ASSP's maillog.txt file.

Don't forget to restart fail2ban.

Check the end of your fail2ban.log whether fail2ban picked up ASSP's log file.