fail2ban/config/filter.d/sshd.conf

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# Fail2Ban configuration file
#
# Author: Cyril Jaquier
#
# $Revision: 613 $
#
[Definition]
# 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
#
failregex = (?:error: PAM: )?Authentication failure for .* from <HOST>\s*$
Failed [-/\w]+ for .* from <HOST>(?: port \d*)?(?: ssh\d*)?\s*$
ROOT LOGIN REFUSED.* FROM <HOST>\s*$
[iI](?:llegal|nvalid) user .* from <HOST>\s*$
User .+ from <HOST> not allowed because not listed in AllowUsers\s*$
User .+ from <HOST> not allowed because none of user's groups are listed in AllowGroups\s*$
# Option: ignoreregex
# Notes.: regex to ignore. If this regex matches, the line is ignored.
# Values: TEXT
#
ignoreregex =