Prepare gated Gitea HTTPS and SSH cutover

ansible/roles/profile_server/tasks/backup_export_job.yml

@@ -44,7 +44,7 @@
   when: server_backup_export_enabled | bool
 
 - name: Install Prometheus backup export helper
-  tags: [services, backup, prometheus_backup]
+  tags: [services, backup, prometheus_backup, gitea_cutover]
   ansible.builtin.template:
     src: prometheus-backup-export.sh.j2
     dest: /usr/local/sbin/prometheus-backup-export

ansible/roles/profile_server/tasks/gitea_ssh_proxy.yml

@@ -0,0 +1,61 @@
+---
+- name: Validate the Prometheus Gitea SSH cutover inputs
+  tags: [services, gitea_cutover]
+  ansible.builtin.assert:
+    that:
+      - server_gitea_cutover_tools_enabled | bool
+      - server_gitea_atlas_address is match('^[0-9]{1,3}(\.[0-9]{1,3}){3}$')
+      - server_gitea_ssh_public_port | int > 1024
+      - server_gitea_ssh_public_port | int < 65536
+      - server_gitea_ssh_target_port | int > 1024
+      - server_gitea_ssh_target_port | int < 65536
+      - server_gitea_ssh_public_port | int != 22
+    fail_msg: Keep administrative SSH on 22 and provide the Atlas rootless Gitea SSH endpoint.
+  when: server_gitea_on_atlas | bool
+
+- name: Install the Gitea SSH socket proxy units without activating them
+  tags: [services, gitea_cutover]
+  ansible.builtin.template:
+    src: "{{ item }}.j2"
+    dest: "/etc/systemd/system/{{ item }}"
+    owner: root
+    group: root
+    mode: "0644"
+  loop:
+    - prometheus-gitea-ssh-proxy.socket
+    - prometheus-gitea-ssh-proxy.service
+  loop_control:
+    label: "{{ item }}"
+  register: server_gitea_ssh_proxy_units
+  when: server_gitea_cutover_tools_enabled | bool
+
+- name: Reload systemd after Gitea SSH proxy unit changes
+  tags: [services, gitea_cutover]
+  ansible.builtin.systemd:
+    daemon_reload: true
+  when:
+    - server_gitea_cutover_tools_enabled | bool
+    - server_gitea_ssh_proxy_units is changed
+    - not ansible_check_mode
+
+- name: Manage the public Gitea SSH socket separately from administrative SSH
+  tags: [services, gitea_cutover]
+  ansible.builtin.systemd:
+    name: prometheus-gitea-ssh-proxy.socket
+    state: "{{ 'started' if server_gitea_on_atlas | bool else 'stopped' }}"
+    enabled: "{{ server_gitea_on_atlas | bool }}"
+  when:
+    - server_gitea_cutover_tools_enabled | bool
+    - not ansible_check_mode
+
+- name: Open only the public Gitea SSH port after cutover
+  tags: [services, gitea_cutover]
+  ansible.posix.firewalld:
+    port: "{{ server_gitea_ssh_public_port }}/tcp"
+    zone: "{{ server_firewalld_zone }}"
+    state: "{{ 'enabled' if server_gitea_on_atlas | bool else 'disabled' }}"
+    permanent: true
+    immediate: true
+  when:
+    - server_gitea_cutover_tools_enabled | bool
+    - server_firewall_backend == 'firewalld'

ansible/roles/profile_server/tasks/main.yml

@@ -37,7 +37,7 @@
     label: "{{ item.dest }}"
 
 - name: Render server templates
-  tags: [dotfiles, dotfiles:server]
+  tags: [dotfiles, dotfiles:server, gitea_cutover]
   ansible.builtin.template:
     src: "{{ item.src }}"
     dest: "{{ item.dest if item.dest.startswith('/') else server_user_home ~ '/' ~ item.dest }}"
@@ -62,6 +62,9 @@
 - name: Import explicit Prometheus Gitea final-export tasks
   ansible.builtin.import_tasks: gitea_final_export.yml
 
+- name: Import Prometheus Gitea SSH proxy tasks
+  ansible.builtin.import_tasks: gitea_ssh_proxy.yml
+
 - name: Ensure server SSH authorized key fragments directory exists
   tags: [services, ssh]
   ansible.builtin.file:

ansible/roles/profile_server/templates/prometheus-backup-export.sh.j2

@@ -59,7 +59,7 @@ stack_stopped=true
 systemctl stop "$stack_unit"
 tar --acls --xattrs --selinux "${excludes[@]}" -C / -cf "$stage/payload.tar" "${paths[@]}"
 systemctl start "$stack_unit"
-for container in nginx-proxy-manager gitea; do
+for container in nginx-proxy-manager{% if not server_gitea_on_atlas | bool %} gitea{% endif %}; do
   running=false
   for _ in {1..30}; do
     if [[ $(podman inspect --format '{{ '{{.State.Running}}' }}' "$container" 2>/dev/null) == true ]]; then

ansible/roles/profile_server/templates/prometheus-gitea-ssh-proxy.service.j2

@@ -0,0 +1,12 @@
+[Unit]
+Description=Forward public Gitea SSH to Atlas through Aegis
+Requires=prometheus-gitea-ssh-proxy.socket
+After=network-online.target wg-quick@wg0.service
+
+[Service]
+ExecStart=/usr/lib/systemd/systemd-socket-proxyd {{ server_gitea_atlas_address }}:{{ server_gitea_ssh_target_port }}
+DynamicUser=true
+NoNewPrivileges=true
+ProtectSystem=strict
+ProtectHome=true
+PrivateTmp=true

ansible/roles/profile_server/templates/prometheus-gitea-ssh-proxy.socket.j2

@@ -0,0 +1,9 @@
+[Unit]
+Description=Public Gitea SSH socket on Prometheus
+
+[Socket]
+ListenStream=0.0.0.0:{{ server_gitea_ssh_public_port }}
+NoDelay=true
+
+[Install]
+WantedBy=sockets.target