refactor(configuration): consolidate firewall into one phase-aware path

roles/configuration/tasks/firewall.yml

@@ -0,0 +1,34 @@
+---
+- name: Enable the firewall daemon in the install chroot
+  when:
+    - firewall_phase == 'install'
+    - _configuration_platform.init_system == 'systemd'
+    - system_cfg.features.firewall.enabled | bool
+  ansible.builtin.command: "{{ chroot_command }} systemctl enable {{ system_cfg.features.firewall.backend }}"
+  register: _firewall_enable
+  changed_when: _firewall_enable.rc == 0
+  failed_when: >-
+    _firewall_enable.rc != 0
+    and 'No such file or directory' not in (_firewall_enable.stderr | default(''))
+    and 'does not exist' not in (_firewall_enable.stderr | default(''))
+
+# ufw's CLI needs a running kernel and is a no-op in the chroot (leaves ENABLED=no),
+# so its activation and SSH rule are applied here, after reboot.
+- name: Allow SSH through ufw before enabling
+  when:
+    - firewall_phase == 'postreboot'
+    - system_cfg.features.firewall.backend == 'ufw'
+    - system_cfg.features.firewall.enabled | bool
+    - system_cfg.features.ssh.enabled | bool
+  ansible.builtin.command: ufw allow 22/tcp
+  register: _ufw_allow
+  changed_when: "'added' in _ufw_allow.stdout or 'updated' in _ufw_allow.stdout"
+
+- name: Activate ufw on the booted target
+  when:
+    - firewall_phase == 'postreboot'
+    - system_cfg.features.firewall.backend == 'ufw'
+    - system_cfg.features.firewall.enabled | bool
+  ansible.builtin.command: ufw --force enable
+  register: _ufw_enable
+  changed_when: "'active' in _ufw_enable.stdout"

roles/configuration/tasks/main.yml

@@ -5,6 +5,8 @@
 - name: Include configuration tasks
   when: configuration_task.when | default(true)
   ansible.builtin.include_tasks: "{{ configuration_task.file }}"
+  vars:
+    firewall_phase: install
   loop:
     - file: repositories.yml
     - file: banner.yml
@@ -12,6 +14,7 @@
     - file: locales.yml
     - file: ssh.yml
     - file: services.yml
+    - file: firewall.yml
     - file: grub.yml
     - file: encryption.yml
       when: "{{ system_cfg.luks.enabled | bool }}"

roles/configuration/tasks/services.yml

@@ -41,8 +41,6 @@
     configuration_systemd_services: >-
       {{
         ['NetworkManager']
-        + (['firewalld'] if system_cfg.features.firewall.backend == 'firewalld' and system_cfg.features.firewall.enabled | bool else [])
-        + (['ufw'] if system_cfg.features.firewall.backend == 'ufw' and system_cfg.features.firewall.enabled | bool else [])
         + ([_configuration_platform.ssh_service] if system_cfg.features.ssh.enabled | bool else [])
         + (['logrotate', 'systemd-timesyncd'] if os == 'archlinux' else [])
         + (['bluetooth'] if system_cfg.features.desktop.enabled | bool else [])

roles/global_defaults/defaults/main.yml

@@ -132,7 +132,7 @@ system_defaults:
       enabled: true
     firewall:
       enabled: true
-      backend: "firewalld" # firewalld|ufw
+      backend: "" # '' -> family default (EL/arch=firewalld, debian/ubuntu=ufw); override: firewalld|ufw
       toolkit: "nftables" # nftables|iptables
     ssh:
       enabled: true

roles/global_defaults/tasks/_normalize_system.yml

@@ -165,7 +165,10 @@
           enabled: "{{ system_raw.features.selinux.enabled | bool }}"
         firewall:
           enabled: "{{ system_raw.features.firewall.enabled | bool }}"
-          backend: "{{ system_raw.features.firewall.backend | string | lower }}"
+          backend: >-
+            {{ (system_raw.features.firewall.backend | default('') | string | lower | trim)
+               if (system_raw.features.firewall.backend | default('') | string | lower | trim | length > 0)
+               else ('ufw' if (system_raw.os | default('') | string | lower) in ['debian', 'ubuntu', 'ubuntu-lts'] else 'firewalld') }}
           toolkit: "{{ system_raw.features.firewall.toolkit | string | lower }}"
         ssh:
           enabled: "{{ system_raw.features.ssh.enabled | bool }}"

roles/global_defaults/tasks/system.yml

@@ -50,7 +50,7 @@
   ansible.builtin.set_fact:
     system_cfg: "{{ system_defaults | combine(system | default({}), recursive=True) | combine(system_cfg, recursive=True) }}"
 
-- name: Apply content-source family defaults for pre-computed system_cfg
+- name: Apply family defaults (content source, firewall backend) for pre-computed system_cfg
   when:
     - system_cfg is defined
     - _bootstrap_needs_enrichment | default(false) | bool
@@ -64,14 +64,21 @@
   ansible.builtin.set_fact:
     system_cfg: >-
       {{
-        system_cfg | combine({'content': {
-          'source': system_cfg.content.source
-                    if (system_cfg.content.source | default('') | string | trim | length > 0)
-                    else ('dvd' if _os == 'rhel' else 'mirror'),
-          'url': system_cfg.content.url
-                 if (system_cfg.content.url | default('') | string | trim | length > 0)
-                 else (_mirror_defaults[_os] | default('')),
-        }}, recursive=True)
+        system_cfg | combine({
+          'content': {
+            'source': system_cfg.content.source
+                      if (system_cfg.content.source | default('') | string | trim | length > 0)
+                      else ('dvd' if _os == 'rhel' else 'mirror'),
+            'url': system_cfg.content.url
+                   if (system_cfg.content.url | default('') | string | trim | length > 0)
+                   else (_mirror_defaults[_os] | default('')),
+          },
+          'features': {'firewall': {'backend':
+            system_cfg.features.firewall.backend
+            if (system_cfg.features.firewall.backend | default('') | string | trim | length > 0)
+            else ('ufw' if _os in ['debian', 'ubuntu', 'ubuntu-lts'] else 'firewalld')
+          }},
+        }, recursive=True)
       }}
 
 - name: Populate primary network fields from first interface (pre-computed)