Manage sets and maps definitions in a specific file.
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README.md
38
README.md
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@ -24,6 +24,10 @@ Highly inspired by [Mike Gleason firewall role][mikegleasonjr firewall github] (
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* **nft_main_conf_content** : Template used to generate the previous main configuration file [default : `etc/nftables.conf.j2`].
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* **nft_input_conf_path** : Input configuration file include in main configuration file [default : `/etc/nftables.d/inet-input.nft`].
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* **nft_input_conf_content** : Template used to generate the previous input configuration file [default : `etc/nftables.d/inet-input.nft.j2`].
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* **nft_define_conf_path** : Vars definition file include in main configuration file [default : `/etc/nftables.d/defines.nft`].
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* **nft_define_conf_content** : Template used to generate the previous vars definition file [default : `etc/nftables.d/defines.nft.j2`].
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* **nft_sets_conf_path** : Sets and maps definition file include in main configuration file [default : `/etc/nftables.d/inet-sets.nft`].
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* **nft_sets_conf_content** : Template used to generate the previous sets and maps definition file [default : `etc/nftables.d/inet-sets.nft.j2`].
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* **nft_global_default_rules** : Set default rules for `global` chain. Other chains will jump to `global` before apply their specific rules.
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* **nft_global_group_rules** : You can add `global` rules or override those defined by **nft_global_default_rules** for a group.
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* **nft_global_host_rules:** : Hosts can also add or override `global` rules.
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@ -63,10 +67,25 @@ nft_global_host_rules: {}
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nft_input_default_rules:
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000 policy:
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- type filter hook input priority 0; policy drop;
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001 global:
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005 global:
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- jump global
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nft_input_group_rules: {}
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nft_input_host_rules: {}
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# define nft vars
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nft_define_default:
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broadcast and multicast:
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desc: 'broadcast and multicast'
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name: badcast_addr
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value: '{ 255.255.255.255, 224.0.0.1, 224.0.0.251 }'
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nft_define_group: {}
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nft_define_host: {}
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nft_set_default:
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blackhole:
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- type ipv4_addr;
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- elements = $badcast_addr
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nft_set_group: {}
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nft_set_host: {}
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```
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Those default will generate the following configuration :
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@ -74,20 +93,19 @@ Those default will generate the following configuration :
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#!/usr/sbin/nft -f
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# Ansible managed
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# clean
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flush ruleset
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include "/etc/nftables.d/defines.nft"
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table inet firewall {
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chain global {
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# 000 state management
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ct state established,related accept
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ct state invalid drop
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}
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chain input {
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type filter hook input priority 0; policy drop;
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jump global
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}
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include "/etc/nftables.d/inet-sets.nft"
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include "/etc/nftables.d/inet-input.nft"
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chain output {
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type filter hook output priority 0;
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jump global
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@ -99,6 +117,11 @@ And you get the same result by displaying the ruleset on the host : `$ nft lis
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```
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table inet firewall {
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set blackhole {
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type ipv4_addr
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elements = { 255.255.255.255, 224.0.0.1, 224.0.0.251 }
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}
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chain global {
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ct state established,related accept
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ct state invalid drop
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@ -148,8 +171,9 @@ nft_input_group_rules:
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This role will :
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* Install `nftables` on the system.
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* Generate a default configuration file loaded by systemd unit.
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* Generate a default configuration file which include all following files and loaded by systemd unit.
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* Generate input rules file include called by the main configuration file.
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* Generate vars in a file and sets and maps in another file.
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* Restart `nftables` service.
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## Development
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@ -12,6 +12,8 @@ nft_input_conf_path: '/etc/nftables.d/inet-input.nft'
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nft_input_conf_content: 'etc/nftables.d/inet-input.nft.j2'
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nft_define_conf_path: '/etc/nftables.d/defines.nft'
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nft_define_conf_content: 'etc/nftables.d/defines.nft.j2'
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nft_set_conf_path: '/etc/nftables.d/inet-sets.nft'
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nft_set_conf_content: 'etc/nftables.d/inet-sets.nft.j2'
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# rules
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nft_global_default_rules:
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@ -23,7 +25,7 @@ nft_global_host_rules: {}
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nft_input_default_rules:
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000 policy:
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- type filter hook input priority 0; policy drop;
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001 global:
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005 global:
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- jump global
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nft_input_group_rules: {}
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nft_input_host_rules: {}
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@ -36,6 +38,12 @@ nft_define_default:
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value: '{ 255.255.255.255, 224.0.0.1, 224.0.0.251 }'
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nft_define_group: {}
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nft_define_host: {}
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nft_set_default:
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blackhole:
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- type ipv4_addr;
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- elements = $badcast_addr
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nft_set_group: {}
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nft_set_host: {}
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# service
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nft_service_manage: true
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@ -49,4 +49,14 @@
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mode: 0755
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backup: yes
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notify: restart nftables service
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- name: generate sets and maps file
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template:
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src: "{{ nft_set_conf_content }}"
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dest: "{{ nft_set_conf_path }}"
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owner: root
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group: root
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mode: 0755
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backup: yes
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notify: restart nftables service
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# }}}
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@ -21,6 +21,7 @@ table inet firewall {
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{% endfor %}
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{% endfor %}
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}
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include "{{ nft_set_conf_path }}"
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include "{{ nft_input_conf_path }}"
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chain output {
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type filter hook output priority 0;
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@ -0,0 +1,15 @@
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# {{ ansible_managed }}
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{% set setmerged = nft_set_default.copy() %}
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{% set _ = setmerged.update(nft_set_group) %}
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{% set _ = setmerged.update(nft_set_host) %}
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{% for set, rules in setmerged|dictsort %}
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{% if rules %}
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set {{ set }} {
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{% for rule in rules %}
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{{ rule }}
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{% endfor %}
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}
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{% endif %}
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{% endfor %}
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