fail2ban/config/filter.d/dropbear.conf

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# Fail2Ban configuration file
#
# Author: Francis Russell
# Zak B. Elep
#
# $Revision$
#
# More information: http://bugs.debian.org/546913
[INCLUDES]
# Read common prefixes. If any customizations available -- read them from
# common.local
before = common.conf
[Definition]
_daemon = dropbear
# Option: failregex
# Notes.: regex to match the password failures 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
# These match the unmodified dropbear messages. It isn't possible to
# match the source of the 'exit before auth' messages from dropbear.
#
failregex = ^%(__prefix_line)slogin attempt for nonexistent user ('.*' )?from <HOST>:.*\s*$
^%(__prefix_line)sbad password attempt for .+ from <HOST>:.*\s*$
# The only line we need to match with the modified dropbear.
# NOTE: The failregex below is ONLY intended to work with a patched
# version of Dropbear as described here:
# http://www.unchartedbackwaters.co.uk/pyblosxom/static/patches
#
# The standard Dropbear output doesn't provide enough information to
# ban all types of attack. The Dropbear patch adds IP address
# information to the 'exit before auth' message which is always
# produced for any form of non-successful login. It is that message
# which this file matches.
# failregex = ^%(__prefix_line)sexit before auth from <HOST>.*\s*$
# Option: ignoreregex
# Notes.: regex to ignore. If this regex matches, the line is ignored.
# Values: TEXT
#
ignoreregex =