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# Fail2Ban configuration file # # Author: Daniel Black # Author: Cyril Jaquier # Modified: Yaroslav O. Halchenko # made active on all ports from original iptables.conf # Modified: Alexander Belykh # adapted for nftables # # This is a included configuration file and includes the definitions for the nftables # used in all nftables based actions by default. # # The user can override the defaults in nftables-common.local # Example: redirect flow to honeypot # # [Init] # table_family = ip # chain_type = nat # chain_hook = prerouting # chain_priority = -50 # blocktype = counter redirect to 2222 [INCLUDES] after = nftables-common.local [Definition] # Option: type # Notes.: type of the action. # Values: [ multiport | allports ] Default: multiport # type = multiport rule_match-custom = rule_match-allports = meta l4proto \{ \} rule_match-multiport = $proto dport \{ $(echo '' | sed s/:/-/g) \} match = > # Option: rule_stat # Notes.: statement for nftables filter rule. # leaving it empty will block all (include udp and icmp) # Values: nftables statement # rule_stat = %(match)s saddr @ # optional interator over protocol's: _nft_for_proto-custom-iter = _nft_for_proto-custom-done = _nft_for_proto-allports-iter = _nft_for_proto-allports-done = _nft_for_proto-multiport-iter = for proto in $(echo '' | sed 's/,/ /g'); do _nft_for_proto-multiport-done = done _nft_list = -a list chain _nft_get_handle_id = grep -oP '@\s+.*\s+\Khandle\s+(\d+)$' _nft_add_set = add set \{ type \; \} <_nft_for_proto--iter> add rule %(rule_stat)s <_nft_for_proto--done> _nft_del_set = { %(_nft_list)s | %(_nft_get_handle_id)s; } | while read -r hdl; do delete rule $hdl; done delete set # Option: _nft_shutdown_table # Notes.: command executed after the stop in order to delete table (it checks that no sets are available): # Values: CMD # _nft_shutdown_table = { list table | grep -qP '^\s+set\s+'; } || { delete table } # 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 = add table -- add chain \{ type hook priority \; \} %(_nft_add_set)s # Option: actionflush # Notes.: command executed once to flush IPS, by shutdown (resp. by stop of the jail or this action); # uses `nft flush set ...` and as fallback (e. g. unsupported) recreates the set (with references) # Values: CMD # actionflush = { flush set 2> /dev/null; } || { %(_nft_del_set)s %(_nft_add_set)s } # Option: actionstop # Notes.: command executed at the stop of jail (or at the end of Fail2Ban) # Values: CMD # actionstop = %(_nft_del_set)s <_nft_shutdown_table> # Option: actioncheck # Notes.: command executed once before each actionban command # Values: CMD # actioncheck = list chain | grep -q '@[ \t]' # 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 # actionban = add element \{ \} # 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 = delete element \{ \} [Init] # Option: table # Notes.: main table to store chain and sets (automatically created on demand) # Values: STRING Default: f2b-table table = f2b-table # Option: table_family # Notes.: address family to work in # Values: [ip | ip6 | inet] Default: inet table_family = inet # Option: chain # Notes.: main chain to store rules # Values: STRING Default: f2b-chain chain = f2b-chain # Option: chain_type # Notes.: refers to the kind of chain to be created # Values: [filter | route | nat] Default: filter # chain_type = filter # Option: chain_hook # Notes.: refers to the kind of chain to be created # Values: [ prerouting | input | forward | output | postrouting ] Default: input # chain_hook = input # Option: chain_priority # Notes.: priority in the chain. # Values: NUMBER Default: -1 # chain_priority = -1 # Option: addr_type # Notes.: address type to work with # Values: [ipv4_addr | ipv6_addr] Default: ipv4_addr # addr_type = ipv4_addr # Default name of the filtering set # name = default # Option: port # Notes.: specifies port to monitor # Values: [ NUM | STRING ] Default: # port = ssh # Option: protocol # Notes.: internally used by config reader for interpolations. # Values: [ tcp | udp ] Default: tcp # protocol = tcp # Option: blocktype # Note: This is what the action does with rules. This can be any jump target # as per the nftables man page (section 8). Common values are drop, # reject, reject with icmpx type host-unreachable, redirect to 2222 # Values: STRING blocktype = reject # Option: nftables # Notes.: Actual command to be executed, including common to all calls options # Values: STRING