fail2ban/config/action.d/mikrotik.conf

# Fail2Ban configuration file
#
# Mikrotik routerOS action to add/remove address-list entries
#
# Author: Duncan Bellamy <dunk@denkimushi.com>
# based on forum.mikrotik.com post by pakjebakmeel
#
# in the instructions:
# (10.0.0.1 is ip of mikrotik router)
# (10.0.0.2 is ip of fail2ban machine)
#
# on fail2ban machine:
# sudo mkdir /var/lib/fail2ban/ssh
# sudo chmod 700 /var/lib/fail2ban/ssh
# sudo ssh-keygen -N "" -f /var/lib/fail2ban/ssh/fail2ban_id_rsa
# sudo scp /var/lib/fail2ban/ssh/fail2ban_id_rsa.pub admin@10.0.0.1:/
# ssh admin@10.0.0.1
#
# on mikrotik router:
# /user add name=miki-f2b group=write address=10.0.0.2 password=""
# /user ssh-keys import public-key-file=fail2ban_id_rsa.pub user=miki-f2b
# /quit
#
# on fail2ban machine:
# (check password login fails)
# ssh miki-f2b@10.0.0.1
# (check private key works)
# sudo ssh -i /var/lib/fail2ban/ssh/fail2ban_id_rsa miki-f2b@10.0.0.1
#
# Then create rules on mikrorik router that use address
# list(s) maintained by fail2ban eg in the forward chain
# drop from address list, or in the forward chain drop
# from address list to server
#
# example extract from jail.local overriding some defaults
# action = mikrotik[keyfile="%(mkeyfile)s", user="%(muser)s", host="%(mhost)s", list="%(mlist)s"]
#
# ignoreip = 127.0.0.1/8 192.168.0.0/24

# mkeyfile = /etc/fail2ban/ssh/mykey_id_rsa
# muser = myuser
# mhost = 192.168.0.1
# mlist = BAD LIST

[Definition]

actionstart =

actionstop = %(actionflush)s

actionflush = %(command)s "/ip firewall address-list remove [find list=\"%(list)s\" comment~\"%(startcomment)s-*\"]"

actioncheck =

actionban = %(command)s "/ip firewall address-list add list=\"%(list)s\" address=<ip> comment=%(comment)s"

actionunban = %(command)s "/ip firewall address-list remove [find list=\"%(list)s\" comment=%(comment)s]"

command = ssh -l %(user)s -p%(port)s -i %(keyfile)s %(host)s

# Option: user
# Notes.: username to use when connecting to routerOS
user =
# Option: port
# Notes.: port to use when connecting to routerOS
port = 22
# Option: keyfile
# Notes.: ssh private key to use for connecting to routerOS
keyfile =
# Option: host
# Notes.: hostname or ip of router
host =
# Option: list
# Notes.: name of "address-list" to use on router
list = Fail2Ban
# Option: startcomment
# Notes.: used as a prefix to all comments, and used to match for flushing rules
startcomment = f2b-<name>
# Option: comment
# Notes.: comment to use on routerOS (must be unique as used for ip address removal)
comment = %(startcomment)s-<ip>

[Init]
name="%(__name__)s"