ansible_role_sshd/tasks/main.yml

---
- include_tasks: versioncheck.yml
  when: submodules_versioncheck

- name: register os-specific variables
  include_vars: default.yml
  when: 
   - ansible_distribution != 'Fedora'
   - ansible_distribution != 'Archlinux'

- name: register os-specific variables
  include_vars: "{{ ansible_distribution }}.yml"
  when: 
   - ansible_distribution == 'Fedora'
   - ansible_distribution == 'Archlinux'

- name: Collect all users and groups allowed to login via ssh
  set_fact:
    sshd_allow_users:  '{{ sshd_default_allowed_users + users.keys() | default({}) | sort }}'
    sshd_allow_groups: '{{ sshd_default_allowed_groups + users.keys() | default({}) | sort }}'

- name: Copy sshd configuration
  become: yes
  template:
    src: sshd_config.j2
    dest: '/etc/ssh/sshd_config'
    owner: root
    group: root
    mode: 'u=rw,g=r,o=r'
    validate: /usr/sbin/sshd -t -f %s
  notify:
    - restart ssh

- name: Generate new ecdsa ssh host key pair if necessary
  become: yes
  command: ssh-keygen -t ecdsa -f 'ssh_host_ecdsa_key' -P '' -q
  args:
    chdir: '/etc/ssh/'
    creates: 'ssh_host_ecdsa_key.pub'
  notify:
    - restart ssh
  when: generate_ecdsa_too

- name: Generate new ed25519 ssh host key pair if necessary
  become: yes
  command: ssh-keygen -t ed25519 -f 'ssh_host_ed25519_key' -P '' -q
  args:
    chdir: '/etc/ssh/'
    creates: 'ssh_host_ed25519_key.pub'
  notify:
    - restart ssh

- name: Remove unwanted host keys
  become: yes
  file:
    path: '/etc/ssh/ssh_host_{{ item }}_key'
    state: absent
  with_items:
    - rsa
    - dsa
  notify:
    - restart ssh
  when: generate_ecdsa_too 

- name: Remove unwanted host keys
  become: yes
  file:
    path: '/etc/ssh/ssh_host_{{ item }}_key'
    state: absent
  with_items:
    - ecdsa
    - rsa
    - dsa
  notify:
    - restart ssh
  when: generate_ecdsa_too == false

- name: make sure the correct keys are available
  file:
    path: '/etc/ssh/ssh_host_{{ item }}_key.pub'
    state: absent
  become: yes
  with_items:
    - ecdsa
    - rsa
    - dsa
  notify:
    - restart ssh
  when: not generate_ecdsa_too

- name: make sure the correct keys are available except ecdsa
  file:
    path: '/etc/ssh/ssh_host_{{ item }}_key.pub'
    state: absent
  become: yes
  with_items:
    - rsa
    - dsa
  notify:
    - restart ssh
  when: generate_ecdsa_too