fail2ban/config/action.d/bsd-ipfw.conf

# Fail2Ban configuration file
#
# Author: Nick Munger
# Modified by: Ken Menzel
#              Daniel Black (start/stop)
#              Fabian Wenk (many ideas as per fail2ban users list)
#
# Ensure firewall_enable="YES" in the top of /etc/rc.conf
#

[Definition]

# Option:  actionstart
# Notes.:  command executed on demand at the first ban (or at the start of Fail2Ban if actionstart_on_demand is set to false).
# Values:  CMD
#
actionstart = ipfw show | fgrep -c -m 1 -s 'table(<table>)' > /dev/null 2>&1 || (
    num=$(ipfw show | awk 'BEGIN { b = <lowest_rule_num> } { if ($1 == b) { b = $1 + 1 } } END { print b }');
    ipfw -q add "$num" <blocktype> <block> from table\(<table>\) to me <port>; echo "$num" > "<startstatefile>"
  )


# Option:  actionstop
# Notes.:  command executed at the stop of jail (or at the end of Fail2Ban)
# Values:  CMD
#
actionstop =  [ ! -f <startstatefile> ] || ( read num < "<startstatefile>" <br> ipfw -q delete $num <br> rm "<startstatefile>" )


# Option:  actioncheck
# Notes.:  command executed once before each actionban command
# Values:  CMD
#
actioncheck = 


# Option:  actionban
# Notes.:  command executed when banning an IP. Take care that the
#          command is executed with Fail2Ban user rights.
# Tags:    See jail.conf(5) man page
# Values:  CMD
#
# requires an ipfw rule like "deny ip from table(1) to me"
actionban = e=`ipfw table <table> add <ip> 2>&1`; x=$?; [ $x -eq 0 -o "$e" = 'ipfw: setsockopt(IP_FW_TABLE_XADD): File exists' ] || echo "$e" | grep -q "record already exists" || { echo "$e" 1>&2; exit $x; }


# Option:  actionunban
# Notes.:  command executed when unbanning an IP. Take care that the
#          command is executed with Fail2Ban user rights.
# Tags:    See jail.conf(5) man page
# Values:  CMD
#
actionunban = e=`ipfw table <table> delete <ip> 2>&1`; x=$?; [ $x -eq 0 -o "$e" = 'ipfw: setsockopt(IP_FW_TABLE_XDEL): No such process' ] || echo "$e" | grep -q "record not found" || { echo "$e" 1>&2; exit $x; }

[Init]
# Option:  table
# Notes:   The ipfw table to use. If a ipfw rule using this table already exists,
#          this action will not create a ipfw rule to block it and the following
#          options will have no effect.
# Values:  NUM
table = 1

# Option:  port
# Notes.:  Specifies port to monitor. Blank indicate block all ports.
# Values:  [ NUM | STRING ]
#
port = 

# Option:  startstatefile
# Notes:   A file to indicate that the table rule that was added. Ensure it is unique per table.
# Values:  STRING
startstatefile = /var/run/fail2ban/ipfw-started-table_<table>

# Option: block
# Notes:  This is how much to block.
#         Can be "ip", "tcp", "udp" or various other options.
# Values: STRING
block = ip

# Option:  blocktype
# Notes.:  How to block the traffic. Use a action from man 5 ipfw
#          Common values: deny, unreach port, reset
#          ACTION defination at the top of man ipfw for allowed values.
# Values:  STRING
#
blocktype = unreach port

# Option:  lowest_rule_num
# Notes:   When fail2ban starts with action and there is no rule for the given table yet
#          then fail2ban will start looking for an empty slot starting with this rule number.
# Values:  NUM
lowest_rule_num = 111