Merge branch 'p-rintz-master'

README.md

@@ -70,6 +70,9 @@ Highly inspired by [Mike Gleason firewall role][mikegleasonjr firewall github] (
 * **nft_service_enabled** : Set `nftables` service available at startup [default : `true`].
 * **nft__service_protect** : If systemd unit should protect system and home [default : `true`].
 * **nft__fail2ban_service** : If the Nftables service should also restart the Fail2ban service [default : `False`].
+* **nft_merged_groups** : If variables from the hosts Ansible groups should be merged [default : `false`].
+* **nft_merged_groups_dir** : The dictionary where the nftables group rules, named like the Ansible groups, are located in [default : `vars/`].
+* **nft_debug** : Toggle more verbose output on/off. [default: 'false'].
 
 ### OS Specific Variables
 
@@ -83,6 +86,7 @@ Each type of rules dictionaries will be merged and rules will be applied in the
   * **nft_*_default_rules** : Define default rules for all nodes. You can define it in `group_vars/all`.
   * **nft_*_rules** : Can add rules and override those defined by **nft_*_default_rules**. You can define it in `group_vars/all`.
   * **nft_*_group_rules** : Can add rules and override those defined by **nft_*_default_rules** and **nft_*_rules**. You can define it in `group_vars/webservers`.
+    * If 'nft_merged_groups' is set to true, multiple group rules from the ansible groups will also be merged together.
   * **nft_*_host_rules** : Can add rules and override those define by **nft_*_default_rules**, **nft_*_group_rules** and **nft_*_rules**. You can define it in `host_vars/www.local.domain`.
 
 `defaults/main.yml`:
@@ -94,6 +98,8 @@ nft_global_default_rules:
     - ct state established,related accept
     - ct state invalid drop
 nft_global_rules: {}
+nft_merged_groups: false
+nft_merged_groups_dir: vars/
 nft_global_group_rules: {}
 nft_global_host_rules: {}
 
@@ -283,6 +289,39 @@ nft_input_group_rules:
     - counter
 ```
 
+* Use merged group rules from multiple ansible groups:
+
+``` yml
+- hosts: serverXYZ
+  vars:
+    nft_merged_groups: true
+    nft_merged_groups_dir: vars/
+  roles:
+    - role: ipr-cnrs.nftables
+```
+
+And put the rules inside the "vars" folder named after your ansible groups of the server:
+
+`vars/first_group` :
+
+``` yaml
+nft_input_group_rules:
+  020 icmp:
+    - ip protocol icmp icmp type echo-request ip length <= 84 counter limit rate 1/minute accept
+  999 count policy packet:
+    - counter
+```
+
+`vars/second_group` :
+
+``` yaml
+nft_input_group_rules:
+  021 LAN:
+    - iif eth0 accept
+```
+
+These rulesets from the two groups will be merged if the host has the two groups as ansible roles.
+
 ## Known Issue
 
 * The 10 minutes delay at the first run is finally fixed by allowing the host to reset SSH connection (flags `rst, psh | ack`) (see #1).

defaults/main.yml

@@ -74,6 +74,17 @@ nft_global_default_rules:
 # in the Ansible inventory.
 nft_global_rules: {}
                                                                    # ]]]
+# .. envvar:: nft_merged_groups [[[
+#
+# Enable or disable the ability to merge multiple firewall group variables
+nft_merged_groups: false
+                                                                   # ]]]
+# .. envvar:: nft_merged_groups_dir [[[
+#
+# The directory to read the group firewall rules from.
+# Relative to the playbook directory.
+nft_merged_groups_dir: vars/
+                                                                   # ]]]
 # .. envvar:: nft_global_group_rules [[[
 #
 # List of global rules (applied on all tables) to configure for hosts in
@@ -514,5 +525,17 @@ nft__service_protect: true
 #   Any Nftables service (re)start will also restart Fail2ban service.
 nft__fail2ban_service: False
                                                                    # ]]]
+# .. envvar:: nft_debug [
+#
+# Toggle on/off more verbose output. Possible options are:
+#
+# ''Flase''
+# Default. No additional output will be given.
+#
+# ''True''
+# More verbose output.
+nft_debug: False
+
+                                                                   # ]]]
                                                                    # ]]]
                                                                    # ]]]

tasks/main.yml

@@ -3,15 +3,50 @@
 #
 # tasks file for nftables
 
+- name: Check for group files
+  become: no
+  delegate_to: localhost
+  stat:
+    path: "{{ nft_merged_groups_dir ~ groupname }}"
+  register: nftables_group_rules
+  loop: "{{ group_names }}"
+  loop_control:
+    loop_var: groupname
+
+- debug: var=nftables_group_rules
+  when: nft_debug
+
+- name: Import nftables-variables if nft_merged_groups is set
+  when: nft_merged_groups and varfile.stat.exists
+  include_vars:
+    file: "{{ nft_merged_groups_dir ~ varfile.groupname }}"
+    name: "{{ varfile.groupname }}"
+  loop: "{{ nftables_group_rules.results }}"
+  loop_control:
+    loop_var: varfile
+
+- name: Combine Rules when nft_merged_groups is set
+  when: nft_merged_groups and (hostvars[inventory_hostname][varfile.groupname] is defined and hostvars[inventory_hostname][varfile.groupname]|length > 0) and varfile.stat.exists
+  set_fact:
+    nft_combined_rules: "{{ nft_combined_rules | default({}) | combine ( hostvars[inventory_hostname][varfile.groupname], recursive=True ) }}"
+  loop: "{{ nftables_group_rules.results }}"
+  loop_control:
+    loop_var: varfile
+
+- debug: var=nft_combined_rules
+  when: nft_debug
+
 - name: Load specific OS vars for nftables
-  include_vars: "{{ item }}"
+  include_vars: "{{ osname }}"
   with_first_found:
     - "{{ ansible_distribution|lower }}-{{ ansible_distribution_version }}.yml"
     - "{{ ansible_distribution|lower }}.yml"
     - "{{ ansible_os_family|lower }}.yml"
+  loop_control:
+    loop_var: osname
 
 # Manage packages [[[1
-- name: Ensure Nftables packages are in there desired state
+- name: Ensure Nftables packages are in their desired state
   package:
     name: '{{ nft_pkg_list | list }}'
     state: '{{ nft_pkg_state }}'
@@ -19,8 +54,8 @@
   until: pkg_install_result is success
   when: nft_enabled|bool
 
-- name: Ensure old Iptables packages are in there desired state
+- name: Ensure old Iptables packages are in their desired state
-  apt:
+  package:
     name: '{{ nft_old_pkg_list | list }}'
     state: '{{ nft_old_pkg_state }}'
   register: pkg_remove_result

templates/etc/nftables.conf.j2

@@ -1,8 +1,12 @@
+#jinja2: lstrip_blocks: "True", trim_blocks: "True"
 #!/usr/sbin/nft -f
 # {{ ansible_managed }}
 {% set globalmerged = nft_global_default_rules.copy() %}
 {% set _ = globalmerged.update(nft_global_rules) %}
 {% set _ = globalmerged.update(nft_global_group_rules) %}
+{% if nft_merged_groups and hostvars[inventory_hostname]['nft_combined_rules'].nft_global_group_rules is defined%}
+  {% set _ = globalmerged.update(hostvars[inventory_hostname]['nft_combined_rules'].nft_global_group_rules) %}
+{% endif %}
 {% set _ = globalmerged.update(nft_global_host_rules) %}
 
 # clean
@@ -14,12 +18,12 @@ table inet filter {
 	chain global {
 {% for group, rules in globalmerged|dictsort  %}
 		# {{ group }}
-{% if not rules %}
+  {% if not rules %}
 		# (none)
-{% endif %}
+  {% endif %}
-{% for rule in rules %}
+  {% for rule in rules %}
 		{{ rule }}
-{% endfor %}
+  {% endfor %}
 {% endfor %}
 	}
 	include "{{ nft_set_conf_path }}"

templates/etc/nftables.d/defines.nft.j2

@@ -1,16 +1,19 @@
+#jinja2: lstrip_blocks: "True", trim_blocks: "True"
 # {{ ansible_managed }}
 {% set definemerged = nft_define_default.copy() %}
 {% set _ = definemerged.update(nft_define) %}
 {% set _ = definemerged.update(nft_define_group) %}
+{% if nft_merged_groups and hostvars[inventory_hostname]['nft_combined_rules'].nft_define_group is defined%}
+  {% set _ = definemerged.update(hostvars[inventory_hostname]['nft_combined_rules'].nft_define_group) %}
+{% endif %}
 {% set _ = definemerged.update(nft_define_host) %}
 
-
 {% for definition in definemerged.values() %}
-{% if definition.desc is defined %}
+  {% if definition.desc is defined %}
 # {{ definition.desc }}
-{% else %}
+  {% else %}
 # {{ definition.name }}
-{% endif %}
+  {% endif %}
 define {{ definition.name }} = {{ definition.value }}
 
 {% endfor %}

templates/etc/nftables.d/filter-input.nft.j2

@@ -1,17 +1,21 @@
+#jinja2: lstrip_blocks: "True", trim_blocks: "True"
 # {{ ansible_managed }}
 {% set inputmerged = nft_input_default_rules.copy() %}
 {% set _ = inputmerged.update(nft_input_rules) %}
 {% set _ = inputmerged.update(nft_input_group_rules) %}
+{% if nft_merged_groups and hostvars[inventory_hostname]['nft_combined_rules'].nft_input_group_rules is defined %}
+  {% set _ = inputmerged.update(hostvars[inventory_hostname]['nft_combined_rules'].nft_input_group_rules) %}
+{% endif %}
 {% set _ = inputmerged.update(nft_input_host_rules) %}
 
 chain input {
 {% for group, rules in inputmerged|dictsort  %}
 	# {{ group }}
-{% if not rules %}
+  {% if not rules %}
 	# (none)
-{% endif %}
+  {% endif %}
-{% for rule in rules %}
+  {% for rule in rules %}
 	{{ rule }}
-{% endfor %}
+  {% endfor %}
 {% endfor %}
 }

templates/etc/nftables.d/filter-output.nft.j2

@@ -1,17 +1,21 @@
+#jinja2: lstrip_blocks: "True", trim_blocks: "True"
 # {{ ansible_managed }}
 {% set outputmerged = nft_output_default_rules.copy() %}
 {% set _ = outputmerged.update(nft_output_rules) %}
 {% set _ = outputmerged.update(nft_output_group_rules) %}
+{% if nft_merged_groups and hostvars[inventory_hostname]['nft_combined_rules'].nft_output_group_rules is defined %}
+  {% set _ = outputmerged.update(hostvars[inventory_hostname]['nft_combined_rules'].nft_output_group_rules) %}
+{% endif %}
 {% set _ = outputmerged.update(nft_output_host_rules) %}
 
 chain output {
 {% for group, rules in outputmerged|dictsort  %}
 	# {{ group }}
-{% if not rules %}
+  {% if not rules %}
 	# (none)
-{% endif %}
+  {% endif %}
-{% for rule in rules %}
+  {% for rule in rules %}
 	{{ rule }}
-{% endfor %}
+  {% endfor %}
 {% endfor %}
 }

templates/etc/nftables.d/nat-postrouting.nft.j2

@@ -1,17 +1,21 @@
+#jinja2: lstrip_blocks: "True", trim_blocks: "True"
 # {{ ansible_managed }}
 {% set postroutingmerged = nft__nat_default_postrouting_rules.copy() %}
 {% set _ = postroutingmerged.update(nft__nat_postrouting_rules) %}
 {% set _ = postroutingmerged.update(nft__nat_group_postrouting_rules) %}
+{% if nft_merged_groups and hostvars[inventory_hostname]['nft_combined_rules'].nft__nat_group_postrouting_rules is defined %}
+  {% set _ = postroutingmerged.update(hostvars[inventory_hostname]['nft_combined_rules'].nft__nat_group_postrouting_rules) %}
+{% endif %}
 {% set _ = postroutingmerged.update(nft__nat_host_postrouting_rules) %}
 
 chain postrouting {
 {% for group, rules in postroutingmerged|dictsort  %}
 	# {{ group }}
-{% if not rules %}
+  {% if not rules %}
 	# (none)
-{% endif %}
+  {% endif %}
-{% for rule in rules %}
+  {% for rule in rules %}
 	{{ rule }}
-{% endfor %}
+  {% endfor %}
 {% endfor %}
 }

templates/etc/nftables.d/nat-prerouting.nft.j2

@@ -1,17 +1,21 @@
+#jinja2: lstrip_blocks: "True", trim_blocks: "True"
 # {{ ansible_managed }}
 {% set preroutingmerged = nft__nat_default_prerouting_rules.copy() %}
 {% set _ = preroutingmerged.update(nft__nat_prerouting_rules) %}
 {% set _ = preroutingmerged.update(nft__nat_group_prerouting_rules) %}
+{% if nft_merged_groups and hostvars[inventory_hostname]['nft_combined_rules'].nft__nat_group_prerouting_rules is defined %}
+  {% set _ = preroutingmerged.update(hostvars[inventory_hostname]['nft_combined_rules'].nft__nat_group_prerouting_rules) %}
+{% endif %}
 {% set _ = preroutingmerged.update(nft__nat_host_prerouting_rules) %}
 
 chain prerouting {
 {% for group, rules in preroutingmerged|dictsort  %}
 	# {{ group }}
-{% if not rules %}
+  {% if not rules %}
 	# (none)
-{% endif %}
+  {% endif %}
-{% for rule in rules %}
+  {% for rule in rules %}
 	{{ rule }}
-{% endfor %}
+  {% endfor %}
 {% endfor %}
 }

templates/etc/nftables.d/sets.nft.j2

@@ -1,16 +1,20 @@
+#jinja2: lstrip_blocks: "True", trim_blocks: "True"
 # {{ ansible_managed }}
 {% set setmerged = nft_set_default.copy() %}
 {% set _ = setmerged.update(nft_set) %}
 {% set _ = setmerged.update(nft_set_group) %}
+{% if nft_merged_groups and hostvars[inventory_hostname]['nft_combined_rules'].nft_set_group is defined %}
+  {% set _ = setmerged.update(hostvars[inventory_hostname]['nft_combined_rules'].nft_set_group) %}
+{% endif %}
 {% set _ = setmerged.update(nft_set_host) %}
 
 {% for set, rules in setmerged|dictsort  %}
-{% if rules %}
+  {% if rules %}
 set {{ set }} {
-{% for rule in rules %}
+    {% for rule in rules %}
 	{{ rule }}
-{% endfor %}
+    {% endfor %}
 }
-{% endif %}
+  {% endif %}
 
 {% endfor %}

vars/centos.yml

@@ -0,0 +1,4 @@
+---
+# vars file for Centos-based distros
+nft_pkg_list:
+  - nftables