/etc/fail2ban/filter.d/vsftpd.conf

# cat /etc/fail2ban/filter.d/vsftpd.conf
# Fail2Ban configuration file
#
# Author: Cyril Jaquier
#
# $Revision: 728 $
#

[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>[\w\-.^_]+)
# Values: TEXT
#
#failregex = vsftpd(?:\(pam_unix\))?(?:\[\d+\])?:.* authentication failure; .* rhost=<HOST>(?:\s+user=\S*)?\s*$
#            \[.+\] FAIL LOGIN: Client "<HOST>"\s*$
#failregex = \[. \] FAIL LOGIN: Client "<HOST>"$
#failregex = \[.+\] \[.+\] FAIL LOGIN: Client "(?P<host>\S+)"$
failregex = \[.+\] FAIL LOGIN: Client "(?P<host>\S+)"$


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