homelab-infra/infrastructure/samba-ad/ansible/roles/samba_ad_acme/tasks/main.yml

---
# Install lego, obtain the DC's LDAPS cert from OpenBao's ACME, deploy it into
# Samba's TLS dir, and enable a renewal timer. Idempotent.

- name: Check installed lego version
  ansible.builtin.command: "{{ samba_ad_acme_bin }} --version"
  register: lego_installed
  changed_when: false
  failed_when: false

- name: Install lego when missing or version mismatch
  when: samba_ad_acme_version not in (lego_installed.stdout | default(''))
  block:
    - name: Download lego release tarball (checksum-verified)
      ansible.builtin.get_url:
        url: "{{ samba_ad_acme_url }}"
        dest: "/tmp/lego_{{ samba_ad_acme_version }}.tar.gz"
        checksum: "{{ samba_ad_acme_checksum }}"
        mode: "0644"
      retries: 3
      delay: 10

    - name: Create lego staging dir
      ansible.builtin.file:
        path: "/tmp/lego_{{ samba_ad_acme_version }}"
        state: directory
        mode: "0755"

    - name: Extract lego
      ansible.builtin.unarchive:
        src: "/tmp/lego_{{ samba_ad_acme_version }}.tar.gz"
        dest: "/tmp/lego_{{ samba_ad_acme_version }}"
        remote_src: true

    - name: Install lego binary
      ansible.builtin.copy:
        src: "/tmp/lego_{{ samba_ad_acme_version }}/lego"
        dest: "{{ samba_ad_acme_bin }}"
        remote_src: true
        owner: root
        group: root
        mode: "0755"

- name: Create ACME state directory
  ansible.builtin.file:
    path: "{{ samba_ad_acme_dir }}"
    state: directory
    owner: root
    group: root
    mode: "0700"

- name: Install the obtain/renew wrapper and deploy hook
  ansible.builtin.template:
    src: "{{ item.src }}"
    dest: "{{ item.dest }}"
    owner: root
    group: root
    mode: "0755"
  loop:
    - { src: samba-acme.sh.j2, dest: /usr/local/bin/samba-acme.sh }
    - { src: samba-acme-deploy.sh.j2, dest: /usr/local/bin/samba-acme-deploy.sh }

- name: Install the renewal systemd service + timer
  ansible.builtin.template:
    src: "{{ item.src }}"
    dest: "{{ item.dest }}"
    owner: root
    group: root
    mode: "0644"
  loop:
    - { src: samba-acme.service.j2, dest: /etc/systemd/system/samba-acme.service }
    - { src: samba-acme.timer.j2, dest: /etc/systemd/system/samba-acme.timer }
  register: acme_units

- name: Reload systemd
  ansible.builtin.systemd_service:
    daemon_reload: true
  when: acme_units is changed

# --- Preflight: the two things that actually make http-01 fail here ------------
- name: Confirm nothing else is bound to port 80
  # lego binds :80 for the duration of validation. Anything already holding it
  # makes issuance fail with a bind error rather than anything ACME-shaped.
  ansible.builtin.shell:
    cmd: "ss -ltn '( sport = :80 )' | tail -n +2 | wc -l"
  register: port80
  changed_when: false

- name: Fail if port 80 is occupied
  ansible.builtin.fail:
    msg: "Port 80 is in use on {{ inventory_hostname }}; lego's http-01 cannot bind it."
  when: port80.stdout | trim | int > 0

- name: Confirm the OpenBao ACME directory is reachable
  ansible.builtin.uri:
    url: "{{ samba_ad_acme_server }}"
    return_content: false
    validate_certs: true
  register: acme_dir
  retries: 3
  delay: 10
  until: acme_dir is succeeded
  changed_when: false

- name: Obtain/renew the certificate now
  # Safe to run every time: lego only acts when the cert is missing or within
  # --renew-days of expiry, and only then fires the deploy hook.
  ansible.builtin.command: /usr/local/bin/samba-acme.sh
  register: lego_run
  changed_when: "'Server responded with a certificate' in (lego_run.stdout | default('') + lego_run.stderr | default(''))"

- name: Enable and start the renewal timer
  ansible.builtin.systemd_service:
    name: samba-acme.timer
    enabled: true
    state: started

- name: Report the live LDAPS certificate
  ansible.builtin.shell:
    cmd: >-
      echo | timeout 10 openssl s_client -connect 127.0.0.1:636 2>/dev/null
      | openssl x509 -noout -subject -issuer -dates
  register: live_cert
  changed_when: false

- name: Show it
  ansible.builtin.debug:
    msg: "{{ live_cert.stdout_lines }}"