Migrate Gitea to rootless Podman / SELinux

- Front git-over-SSH with host sshd and live key lookup
- Build and load custom SELinux policies oci_log and gitea_ssh

roles/gitea/defaults/main.yml

@@ -1,6 +1,6 @@
 # container settings
 gitea_name: gitea
-gitea_sshport: "222"
+gitea_sshport: "2222"
 gitea_webport: "3000"
 gitea_ssh: "127.0.0.1:{{ gitea_sshport }}"
 gitea_web: "127.0.0.1:{{ gitea_webport }}"
@@ -16,7 +16,12 @@ gitea_dbuser: "{{ gitea_name }}"
 
 # proxy settings
 gitea_proxy_limit: "1"
-gitea_trusted_proxies: "172.16.0.0/12"
+gitea_trusted_proxies: "10.89.0.0/16"
 
 # host
-gitea_root: "{{ docker_compose_root }}/{{ gitea_name }}"
+gitea_root: "{{ podman_compose.git.root }}/{{ gitea_name }}"
+gitea_logs: "{{ podman_log_root }}/{{ gitea_name }}"
+gitea_data: /srv/gitea
+gitea_se_level: "s0:c22,c222"
+gitea_uid: 1000
+gitea_oci_uid: "{{ podman_subuid_base['git'] | int + gitea_uid | int - 1 }}"

roles/gitea/files/gitea_ssh.te

@@ -0,0 +1,9 @@
+module gitea_ssh 1.0;
+
+require {
+    type sshd_t;
+    type ssh_exec_t;
+    class file { getattr read open map execute execute_no_trans };
+}
+
+allow sshd_t ssh_exec_t:file { getattr read open map execute execute_no_trans };

roles/gitea/handlers/main.yml

@@ -1,5 +1,5 @@
-- name: Restart Gitea
-  ansible.builtin.service:
-    name: "{{ docker_compose_service }}@{{ gitea_name }}"
-    state: restarted
-  listen: restart_gitea
+- name: Reload ssh
+  ansible.builtin.systemd_service:
+    name: ssh
+    state: reloaded
+  listen: restart_ssh

roles/gitea/tasks/main.yml

@@ -13,7 +13,7 @@
   community.mysql.mysql_user:
     name: "{{ gitea.DB_USER }}"
     password: "{{ gitea.DB_PASSWD }}"
-    host: '%'
+    host: "%"
     state: present
     priv: "{{ gitea.DB_NAME }}.*:ALL"
     login_unix_socket: /var/run/mysqld/mysqld.sock
@@ -21,35 +21,36 @@
 - name: Create git's .ssh directory
   ansible.builtin.file:
     path: /home/git/.ssh
+    owner: git
+    group: git
     mode: "700"
     state: directory
+    setype: >-
+      {{ (selinux is defined and selinux is not false)
+        | ternary('ssh_home_t', omit) }}
 
 - name: Generate git's SSH keys
   community.crypto.openssh_keypair:
     path: /home/git/.ssh/id_rsa
+    owner: git
+    group: git
+    mode: "600"
+  register: gitea_keypair
+
+- name: Label git's SSH keys for sshd access
+  ansible.builtin.file:
+    path: "/home/git/.ssh/{{ item }}"
+    setype: >-
+      {{ (selinux is defined and selinux is not false)
+        | ternary('ssh_home_t', omit) }}
+  loop:
+    - id_rsa
+    - id_rsa.pub
 
 - name: Find git's public SSH key
   ansible.builtin.slurp:
     src: /home/git/.ssh/id_rsa.pub
-  register: git_rsapub
-
-- name: Get stats on git's authorized_keys file
-  ansible.builtin.stat:
-    path: /home/git/.ssh/authorized_keys
-  register: git_authkeys
-
-- name: Create git's authorized_keys file
-  ansible.builtin.file:
-    path: /home/git/.ssh/authorized_keys
-    mode: "600"
-    state: touch
-  when: not git_authkeys.stat.exists
-
-- name: Add git's public SSH key to authorized_keys
-  ansible.builtin.lineinfile:
-    path: /home/git/.ssh/authorized_keys
-    regex: "^ssh-rsa"
-    line: "{{ git_rsapub['content'] | b64decode }}"
+  register: gitea_rsapub
 
 - name: Create Gitea host script for SSH
   ansible.builtin.template:
@@ -57,11 +58,147 @@
     dest: /usr/local/bin/gitea
     mode: "755"
 
+- name: Install Gitea SSH SELinux policy source
+  ansible.builtin.copy:
+    src: gitea_ssh.te
+    dest: "{{ podman_selinux_dir }}/gitea_ssh.te"
+    owner: root
+    group: root
+    mode: "0644"
+  register: gitea_selinux_src
+  when: selinux is defined and selinux is not false
+
+- name: Clear stale Gitea SSH SELinux artifacts
+  ansible.builtin.file:
+    path: "{{ podman_selinux_dir }}/gitea_ssh.{{ item }}"
+    state: absent
+  loop: [mod, pp]
+  when:
+    - selinux is defined and selinux is not false
+    - gitea_selinux_src is changed
+
+- name: Compile Gitea SSH SELinux policy module
+  ansible.builtin.command:
+    cmd: >-
+      checkmodule -M -m -o {{ podman_selinux_dir }}/gitea_ssh.mod
+      {{ podman_selinux_dir }}/gitea_ssh.te
+    creates: "{{ podman_selinux_dir }}/gitea_ssh.mod"
+  when: selinux is defined and selinux is not false
+
+- name: Package Gitea SSH SELinux policy module
+  ansible.builtin.command:
+    cmd: >-
+      semodule_package -o {{ podman_selinux_dir }}/gitea_ssh.pp
+      -m {{ podman_selinux_dir }}/gitea_ssh.mod
+    creates: "{{ podman_selinux_dir }}/gitea_ssh.pp"
+  when: selinux is defined and selinux is not false
+
+- name: List loaded SELinux policy modules for Gitea
+  ansible.builtin.command:
+    cmd: semodule -l
+  register: gitea_semodule_list
+  changed_when: false
+  when: selinux is defined and selinux is not false
+
+- name: Load Gitea SSH SELinux policy module
+  ansible.builtin.command:
+    cmd: semodule -i {{ podman_selinux_dir }}/gitea_ssh.pp
+  register: gitea_semodule
+  changed_when: gitea_semodule.rc == 0
+  when:
+    - selinux is defined and selinux is not false
+    - gitea_selinux_src is changed or "gitea_ssh" not in gitea_semodule_list.stdout_lines
+
+- name: Configure sshd for Gitea AuthorizedKeysCommand
+  ansible.builtin.template:
+    src: gitea_sshd.conf.j2
+    dest: /etc/ssh/sshd_config.d/gitea.conf
+    owner: root
+    group: root
+    mode: "0644"
+    validate: /usr/sbin/sshd -t -f %s
+  notify: restart_ssh
+
+- name: Set SELinux context on Gitea's data directory
+  community.general.sefcontext:
+    target: "{{ gitea_data }}(/.*)?"
+    setype: container_file_t
+    selevel: "{{ gitea_se_level }}"
+    state: present
+  when: selinux is defined and selinux is not false
+
+- name: Create Gitea's data directory
+  ansible.builtin.file:
+    path: "{{ gitea_data }}"
+    state: directory
+    owner: "{{ gitea_oci_uid }}"
+    group: "{{ gitea_oci_uid }}"
+    mode: "0750"
+    setype: >-
+      {{ (selinux is defined and selinux is not false)
+        | ternary('container_file_t', omit) }}
+    selevel: "{{ gitea_se_level }}"
+
+- name: Create Gitea's container-side SSH directories
+  ansible.builtin.file:
+    path: "{{ item.path }}"
+    state: directory
+    owner: "{{ gitea_oci_uid }}"
+    group: "{{ gitea_oci_uid }}"
+    mode: "{{ item.mode }}"
+    setype: >-
+      {{ (selinux is defined and selinux is not false)
+        | ternary('container_file_t', omit) }}
+    selevel: "{{ gitea_se_level }}"
+  loop:
+    - { path: "{{ gitea_data }}/git", mode: "0755" }
+    - { path: "{{ gitea_data }}/git/.ssh", mode: "0700" }
+
+- name: Authorise git's public SSH key inside the container
+  ansible.builtin.copy:
+    content: "{{ gitea_rsapub['content'] | b64decode }}"
+    dest: "{{ gitea_data }}/git/.ssh/authorized_keys"
+    owner: "{{ gitea_oci_uid }}"
+    group: "{{ gitea_oci_uid }}"
+    mode: "0600"
+    setype: >-
+      {{ (selinux is defined and selinux is not false)
+        | ternary('container_file_t', omit) }}
+    selevel: "{{ gitea_se_level }}"
+
+- name: Set SELinux context on Gitea's logging directory
+  community.general.sefcontext:
+    target: "{{ gitea_logs }}(/.*)?"
+    setype: oci_log_t
+    selevel: "{{ gitea_se_level }}"
+    state: present
+  when: selinux is defined and selinux is not false
+
 - name: Create Gitea's logging directory
   ansible.builtin.file:
-    name: /var/log/gitea
+    name: "{{ gitea_logs }}"
     state: directory
-    mode: "755"
+    owner: "{{ gitea_oci_uid }}"
+    group: "{{ gitea_oci_uid }}"
+    mode: "0755"
+    setype: >-
+      {{ (selinux is defined and selinux is not false)
+        | ternary('oci_log_t', omit) }}
+    selevel: "{{ gitea_se_level }}"
+
+- name: Create Gitea's log file for Fail2ban
+  ansible.builtin.file:
+    path: /var/log/oci/gitea/gitea.log
+    state: touch
+    owner: "{{ gitea_oci_uid }}"
+    group: "{{ gitea_oci_uid }}"
+    mode: "0640"
+    modification_time: preserve
+    access_time: preserve
+    setype: >-
+      {{ (selinux is defined and selinux is not false)
+        | ternary('oci_log_t', omit) }}
+    selevel: "{{ gitea_se_level }}"
 
 - name: Install Gitea's Fail2ban filter
   ansible.builtin.template:

roles/gitea/templates/compose-env.j2

@@ -1,19 +0,0 @@
-# {{ ansible_managed }}
-gitea_version={{ gitea_version }}
-gitea_name={{ gitea_name }}
-gitea_domain={{ gitea_domain }}
-gitea_rooturl={{ gitea_rooturl }}
-gitea_web={{ gitea_web }}
-gitea_ssh={{ gitea_ssh }}
-gitea_dbtype={{ gitea_dbtype }}
-gitea_dbhost={{ gitea_dbhost }}
-gitea_dbname={{ gitea_dbname }}
-gitea_dbuser={{ gitea_dbuser }}
-gitea_dbpass={{ gitea_dbpass }}
-gitea_proxy_limit={{ gitea_proxy_limit }}
-gitea_trusted_proxies={{ gitea_trusted_proxies }}
-{% if not gitea_signup %}
-gitea_disable_registration=true
-{% else %}
-gitea_disable_registration=false
-{% endif %}

roles/gitea/templates/docker-compose.yml.j2

@@ -1,36 +0,0 @@
-version: '3.7'
-
-services:
-  gitea:
-    image: "gitea/gitea:${gitea_version}"
-    container_name: "${gitea_name}"
-    ports:
-      - "${gitea_ssh}:22"
-      - "${gitea_web}:3000"
-    extra_hosts:
-      - "host.docker.internal:host-gateway"
-    environment:
-      - USER_UID={{ getent_passwd.git[1] }}
-      - USER_GID={{ getent_group.git[1] }}
-      - GITEA__log__MODE=file
-      - GITEA__server__ROOT_URL=${gitea_rooturl}
-      - GITEA__server__DOMAIN=${gitea_domain}
-      - GITEA__server__SSH_DOMAIN=${gitea_domain}
-      - GITEA__database__DB_TYPE=${gitea_dbtype}
-      - GITEA__database__HOST=${gitea_dbhost}
-      - GITEA__database__NAME=${gitea_dbname}
-      - GITEA__database__USER=${gitea_dbuser}
-      - GITEA__database__PASSWD=${gitea_dbpass}
-      - GITEA__security__INSTALL_LOCK=true
-      - GITEA__security__REVERSE_PROXY_LIMIT=${gitea_proxy_limit}
-      - GITEA__security__REVERSE_PROXY_TRUSTED_PROXIES=${gitea_trusted_proxies}
-      - GITEA__service__DISABLE_REGISTRATION=${gitea_disable_registration}
-    volumes:
-      - {{ gitea_volume }}:/data
-      - /home/git/.ssh:/data/git/.ssh
-      - /var/log/gitea:/data/gitea/log
-      - /etc/timezone:/etc/timezone:ro
-      - /etc/localtime:/etc/localtime:ro
-
-volumes:
-  {{ gitea_volume }}:

roles/gitea/templates/fail2ban-jail.conf.j2

@@ -2,17 +2,8 @@
 [gitea]
 enabled = true
 filter = gitea
-logpath = /var/log/gitea/gitea.log
+logpath = {{ gitea_logs }}/gitea.log
 maxretry = 10
 findtime = 3600
 bantime = 900
 action = iptables-allports
-
-[gitea-docker]
-enabled = true
-filter = gitea
-logpath = /var/log/gitea/gitea.log
-maxretry = 10
-findtime = 3600
-bantime = 900
-action = iptables-allports[chain="FORWARD"]

roles/gitea/templates/gitea_sshd.conf.j2

@@ -0,0 +1,3 @@
+# {{ ansible_managed }}
+AuthorizedKeysCommand /usr/local/bin/gitea keys -e git -u %u -t %t -k %k
+AuthorizedKeysCommandUser git