lilik_playbook/roles/ssh_server/tasks/main.yaml

---
- import_role: name='service'
  vars:
    service_name: 'ssh'
    service_packages:
      - 'openssh-server'
      - 'openssh-sftp-server'

- name: 'upload user and server ca'
  copy:
    content: |
      {% for ca in item.1 %}
      {{ ca }}
      {% endfor %}
    dest: '/etc/ssh/{{ item.0 }}_ca.pub'
  vars:
    cas: '{{ item.1 }}'
  notify: 'restart ssh'
  loop:
    - [ 'user', '{{ ssh_user_ca }}' ]
    - [ 'server', '{{ ssh_server_ca }}' ]
  tags:
    - 'ssh_certs'

- name: 'generate and sign host certificate'
  import_role: name='ca_cert'
  vars:
    ca_cert_common_name: '{{ host_fqdn }}'
    ca_cert_proto: 'ssh'
    ca_cert_ssh_ca_path: '/etc/ssh/server_ca.pub'
    ca_cert_ssh_key_path: '/etc/ssh/ssh_host_ed25519_key'
  tags:
    - 'ssh_certs'

- name: 'add host certificate to sshd config'
  lineinfile:
    line: 'HostCertificate /etc/ssh/ssh_host_ed25519_key-cert.pub'
    dest: '/etc/ssh/sshd_config'
    regexp: '^HostCertificate *'
  notify: 'restart ssh'
  tags:
    - 'ssh_certs'

- name: 'add user ca to sshd config'
  lineinfile:
    line: 'TrustedUserCAKeys /etc/ssh/user_ca.pub'
    dest: '/etc/ssh/sshd_config'
    regexp: '^TrustedUserCAKeys *'
  notify: 'restart ssh'
  tags:
    - 'ssh_certs'

- name: 'permit root login only with certificate'
  lineinfile:
    line: 'PermitRootLogin without-password'
    dest: '/etc/ssh/sshd_config'
    regexp: '^PermitRootLogin *'
  notify: 'restart ssh'

- meta: 'flush_handlers'

- name: 'waiting for ssh on {{ inventory_hostname }} to start'
  wait_for:
    host: '{{ hostvars | ip_from_inventory(inventory_hostname) }}'
    port: 22
    timeout: 30
  delegate_to: 'localhost'
  delegate_facts: true