roles/common: rework firewall
Use firehol instead of all the others. AbuseIPDB.com can't be upd- ated automatically, Abuse.ch is no longer maintained, and Spamhaus is already in firehol.
This commit is contained in:
@ -5,47 +5,18 @@
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flush ruleset
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# Lists updated daily by update-spamhaus-nftables.sh
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include "/etc/nftables/spamhaus-ipv4.nft"
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include "/etc/nftables/spamhaus-ipv6.nft"
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# Lists updated monthly (manually)
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include "/etc/nftables/abuseipdb-ipv4.nft"
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include "/etc/nftables/abuseipdb-ipv6.nft"
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# Lists updated daily by update-abusech-nftables.sh
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include "/etc/nftables/abusech-ipv4.nft"
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# List updated daily by update-firehol-nftables.sh
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include "/etc/nftables/firehol_level1-ipv4.nft"
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# Notes:
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# - tables hold chains, chains hold rules
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# - inet is for both ipv4 and ipv6
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table inet filter {
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set spamhaus-ipv4 {
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set firehol_level1-ipv4 {
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type ipv4_addr
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# if the set contains prefixes we need to use the interval flag
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flags interval
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elements = $SPAMHAUS_IPV4
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}
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set spamhaus-ipv6 {
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type ipv6_addr
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flags interval
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elements = $SPAMHAUS_IPV6
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}
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set abusech-ipv4 {
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type ipv4_addr
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elements = $ABUSECH_IPV4
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}
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set abuseipdb-ipv4 {
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type ipv4_addr
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elements = $ABUSEIPDB_IPV4
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}
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set abuseipdb-ipv6 {
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type ipv6_addr
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elements = $ABUSEIPDB_IPV6
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elements = $FIREHOL_LEVEL1_IPV4
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}
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chain input {
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@ -55,13 +26,7 @@ table inet filter {
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ct state invalid counter drop comment "Early drop of invalid connections"
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ip saddr @spamhaus-ipv4 counter drop comment "Early drop of incoming packets matching spamhaus-ipv4 list"
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ip6 saddr @spamhaus-ipv6 counter drop comment "Early drop of incoming packets matching spamhaus-ipv6 list"
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ip saddr @abusech-ipv4 counter drop comment "Early drop of packets matching abusech-ipv4 list"
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ip saddr @abuseipdb-ipv4 counter drop comment "Early drop of incoming packets matching abuseipdb-ipv4 list"
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ip6 saddr @abuseipdb-ipv6 counter drop comment "Early drop of incoming packets matching abuseipdb-ipv6 list"
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ip saddr @firehol_level1-ipv4 counter drop comment "Early drop of incoming packets matching firehol_level1-ipv4 list"
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iifname lo accept comment "Allow from loopback"
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@ -105,12 +70,6 @@ table inet filter {
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chain output {
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type filter hook output priority 0;
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ip daddr @spamhaus-ipv4 counter drop comment "Drop outgoing packets matching spamhaus-ipv4 list"
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ip6 daddr @spamhaus-ipv6 counter drop comment "Drop outgoing packets matching spamhaus-ipv6 list"
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ip daddr @abusech-ipv4 counter drop comment "Drop outgoing packets matching abusech-ipv4 list"
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ip daddr @abuseipdb-ipv4 counter drop comment "Drop outgoing packets matching abuseipdb-ipv4 list"
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ip6 daddr @abuseipdb-ipv6 counter drop comment "Drop outgoing packets matching abuseipdb-ipv6 list"
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ip daddr @firehol_level1-ipv4 counter drop comment "Drop outgoing packets matching firehol_level1-ipv4 list"
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}
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}
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67
roles/common/templates/update-firehol-nftables.sh.j2
Executable file
67
roles/common/templates/update-firehol-nftables.sh.j2
Executable file
@ -0,0 +1,67 @@
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#!/usr/bin/env bash
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#
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# update-firehol-nftables.sh v0.0.1
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#
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# Download FireHOL lists and load them into nftables sets.
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#
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# See: https://iplists.firehol.org/
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#
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# Copyright (C) 2025 Alan Orth
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#
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# SPDX-License-Identifier: GPL-3.0-only
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# Exit on first error
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set -o errexit
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firehol_level1_ipv4_set_path=/etc/nftables/firehol_level1-ipv4.nft
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function download() {
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echo "Downloading $1"
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wget -q -O - "https://iplists.firehol.org/files/$1" > "$1"
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}
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download firehol_level1.netset
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if [[ -f "firehol_level1.netset" ]]; then
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echo "Processing FireHOL Level 1 list"
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firehol_level1_ipv4_list_temp=$(mktemp)
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firehol_level1_ipv4_set_temp=$(mktemp)
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# Filter blank lines and comments
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cat firehol_level1.netset \
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| sed \
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-e '/^$/d' \
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-e '/^#.*/d' \
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> "$firehol_level1_ipv4_list_temp"
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echo "Building firehol_level1-ipv4 set"
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cat << NFT_HEAD > "$firehol_level1_ipv4_set_temp"
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#!/usr/sbin/nft -f
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define FIREHOL_LEVEL1_IPV4 = {
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NFT_HEAD
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while read -r network; do
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# nftables doesn't mind if the last element in the set has a trailing
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# comma so we don't need to do anything special here.
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echo "$network," >> "$firehol_level1_ipv4_set_temp"
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done < $firehol_level1_ipv4_list_temp
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echo "}" >> "$firehol_level1_ipv4_set_temp"
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install -m 0600 "$firehol_level1_ipv4_set_temp" "$firehol_level1_ipv4_set_path"
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rm -f "$firehol_level1_ipv4_list_temp" "$firehol_level1_ipv4_set_temp"
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fi
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echo "Reloading nftables"
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{% if ansible_distribution == 'Ubuntu' and ansible_distribution_version is version('20.04', '<=') %}
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{% set systemctl_bin = '/bin/systemctl' %}
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{% else %}
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{% set systemctl_bin = '/usr/bin/systemctl' %}
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{% endif -%}
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{{ systemctl_bin }} reload nftables.service
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rm -v firehol_level1.netset
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