---
- name: Reject incomplete Atlas account configuration
  tags: [atlas, services]
  ansible.builtin.assert:
    that:
      - atlas_admin_username != 'CHANGEME_ATLAS_ADMIN'
      - (atlas_admin_ssh_keys | default([])) | length > 0
      - atlas_admin_password_hash not in ['', '!', '*']
      - atlas_ssh_allow_tcp_forwarding in ['no', 'yes', 'local', 'remote', 'all']
      - "'wheel' not in atlas_immich_supplementary_groups"
    fail_msg: >-
      Define atlas_admin_username, atlas_admin_ssh_keys and vault_atlas_admin_password_hash
      before applying the Atlas profile.
  no_log: true

- name: Create Atlas administrator group
  tags: [atlas, services]
  ansible.builtin.group:
    name: "{{ atlas_admin_group }}"
    gid: "{{ atlas_admin_gid }}"
    state: present

- name: Create Atlas administrator account
  tags: [atlas, services]
  ansible.builtin.user:
    name: "{{ atlas_admin_username }}"
    uid: "{{ atlas_admin_uid }}"
    group: "{{ atlas_admin_group }}"
    home: "{{ atlas_admin_home }}"
    shell: /bin/bash
    password: "{{ atlas_admin_password_hash }}"
    create_home: true
    state: present
  no_log: true

- name: Create Immich primary group
  tags: [atlas, accounts, containers, immich]
  ansible.builtin.group:
    name: "{{ atlas_immich_group }}"
    gid: "{{ atlas_immich_gid }}"
    state: present

- name: Ensure Immich hardware-access groups exist
  tags: [atlas, accounts, containers, immich]
  ansible.builtin.group:
    name: "{{ item }}"
    state: present
  loop: "{{ atlas_immich_supplementary_groups }}"
  loop_control:
    label: "{{ item }}"

- name: Create unprivileged Immich account
  tags: [atlas, accounts, containers, immich]
  ansible.builtin.user:
    name: "{{ atlas_immich_username }}"
    uid: "{{ atlas_immich_uid }}"
    group: "{{ atlas_immich_group }}"
    groups: "{{ atlas_immich_supplementary_groups }}"
    append: false
    home: /nonexistent
    create_home: false
    shell: /sbin/nologin
    system: true
    state: present

- name: Read Immich hardware-access group IDs
  tags: [atlas, accounts, containers, immich]
  ansible.builtin.getent:
    database: group

- name: Grant Atlas administrator passwordless sudo
  tags: [atlas, services]
  ansible.builtin.copy:
    content: "{{ atlas_admin_username }} ALL=(ALL) NOPASSWD: ALL\n"
    dest: "/etc/sudoers.d/{{ atlas_admin_username }}"
    owner: root
    group: root
    mode: "0440"
    validate: "visudo -cf %s"

- name: Ensure Atlas administrator SSH authorized key fragments directory exists
  tags: [atlas, services]
  ansible.builtin.file:
    path: "{{ atlas_admin_ssh_key_directory }}"
    state: directory
    owner: "{{ atlas_admin_username }}"
    group: "{{ atlas_admin_group }}"
    mode: "0700"

- name: Manage Atlas administrator SSH authorized key fragments
  tags: [atlas, services]
  ansible.builtin.copy:
    content: "{{ item.key }}\n"
    dest: "{{ atlas_admin_ssh_key_directory }}/{{ item.name }}"
    owner: "{{ atlas_admin_username }}"
    group: "{{ atlas_admin_group }}"
    mode: "0600"
  loop: "{{ atlas_admin_ssh_keys }}"
  loop_control:
    label: "{{ item.name }}"

- name: Check whether the Atlas SSH host key exists
  tags: [atlas, services]
  ansible.builtin.stat:
    path: /etc/ssh/ssh_host_ed25519_key
  register: atlas_ssh_host_ed25519_key

- name: Generate missing Atlas SSH host keys
  tags: [atlas, services]
  ansible.builtin.command:
    argv:
      - ssh-keygen
      - -A
  changed_when: true
  when: not atlas_ssh_host_ed25519_key.stat.exists

- name: Ensure Atlas SSH configuration drop-in directory exists
  tags: [atlas, services]
  ansible.builtin.file:
    path: /etc/ssh/sshd_config.d
    state: directory
    owner: root
    group: root
    mode: "0755"

- name: Ensure Atlas SSH drop-ins are loaded before other settings
  tags: [atlas, services]
  ansible.builtin.lineinfile:
    path: /etc/ssh/sshd_config
    regexp: '^\s*Include\s+/etc/ssh/sshd_config\.d/\*\.conf\s*$'
    line: Include /etc/ssh/sshd_config.d/*.conf
    insertbefore: BOF
    state: present
    validate: "sshd -t -f %s"

- name: Render Atlas SSH hardening drop-in
  tags: [atlas, services]
  ansible.builtin.template:
    src: 00-atlas-hardening.conf.j2
    dest: /etc/ssh/sshd_config.d/00-atlas-hardening.conf
    owner: root
    group: root
    mode: "0600"
  notify: Reload SSH service

- name: Read effective Atlas SSH daemon configuration
  tags: [atlas, services]
  ansible.builtin.command:
    argv:
      - sshd
      - -T
      - -C
      - "user={{ atlas_admin_username }},host=atlas,addr=127.0.0.1"
  register: atlas_sshd_effective_configuration
  changed_when: false
  when: not ansible_check_mode

- name: Verify effective Atlas SSH hardening
  tags: [atlas, services]
  ansible.builtin.assert:
    that:
      - "'permitrootlogin no' in atlas_sshd_effective_configuration.stdout_lines"
      - "'pubkeyauthentication yes' in atlas_sshd_effective_configuration.stdout_lines"
      - "'passwordauthentication no' in atlas_sshd_effective_configuration.stdout_lines"
      - "'kbdinteractiveauthentication no' in atlas_sshd_effective_configuration.stdout_lines"
      - "'authenticationmethods publickey' in atlas_sshd_effective_configuration.stdout_lines"
      - "'x11forwarding no' in atlas_sshd_effective_configuration.stdout_lines"
      - "('allowtcpforwarding ' ~ atlas_ssh_allow_tcp_forwarding) in atlas_sshd_effective_configuration.stdout_lines"
      - "'allowagentforwarding no' in atlas_sshd_effective_configuration.stdout_lines"
      - "'gatewayports no' in atlas_sshd_effective_configuration.stdout_lines"
      - "'permittunnel no' in atlas_sshd_effective_configuration.stdout_lines"
      - "'permituserenvironment no' in atlas_sshd_effective_configuration.stdout_lines"
      - "'maxauthtries 3' in atlas_sshd_effective_configuration.stdout_lines"
      - "'logingracetime 30' in atlas_sshd_effective_configuration.stdout_lines"
      - "'clientaliveinterval 300' in atlas_sshd_effective_configuration.stdout_lines"
      - "'clientalivecountmax 2' in atlas_sshd_effective_configuration.stdout_lines"
      - "'loglevel VERBOSE' in atlas_sshd_effective_configuration.stdout_lines"
      - "('allowusers ' ~ atlas_admin_username) in atlas_sshd_effective_configuration.stdout_lines"
    fail_msg: The effective Atlas SSH configuration does not match the required hardening.
  when: not ansible_check_mode