Ansible_PUBLIC/ansible/roles/ssh_hardening/tasks/main.yml

- name: Password based logins are disabled - only public key based logins are allowed.
  lineinfile: dest=/etc/ssh/sshd_config regexp='^#?AuthenticationMethods' line='AuthenticationMethods publickey'
- lineinfile: dest=/etc/ssh/sshd_config regexp='^#?PasswordAuthentication' line='PasswordAuthentication no'
- lineinfile: dest=/etc/ssh/sshd_config regexp='^#?ChallengeResponseAuthentication' line='ChallengeResponseAuthentication no'
- lineinfile: dest=/etc/ssh/sshd_config regexp='^#?PubkeyAuthentication' line='PubkeyAuthentication yes'
- lineinfile: dest=/etc/ssh/sshd_config regexp='^PermitRootLogin' line='PermitRootLogin No'

- name: restart sshd
  systemd:
    state: restarted
    daemon_reload: yes
    name: sshd