ansible-personal/roles/common/tasks/sshd.yml

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---
# SSH configs don't change in Debian minor versions
- name: Reconfigure /etc/ssh/sshd_config
ansible.builtin.template: src=sshd_config_{{ ansible_distribution }}-{{ ansible_distribution_major_version }}.j2 dest=/etc/ssh/sshd_config owner=root group=root mode=0600
when: ansible_distribution == 'Debian'
notify: reload sshd
# Ubuntu is the only distro we have where SSH version is very different from 14.04 -> 14.10,
# ie with new ciphers supported etc.
- name: Reconfigure /etc/ssh/sshd_config
ansible.builtin.template: src=sshd_config_{{ ansible_distribution }}-{{ ansible_distribution_version }}.j2 dest=/etc/ssh/sshd_config owner=root group=root mode=0600
when: ansible_distribution == 'Ubuntu'
notify: reload sshd
# See: WeakDH (2015): https://weakdh.org/sysadmin.html
- name: Remove small Diffie-Hellman SSH moduli
block:
- name: Check unsafe Diffie-Hellman SSH moduli
ansible.builtin.shell:
cmd: awk '$5 < 3071' moduli
chdir: /etc/ssh
creates: moduli.safe
register: check_unsafe_moduli
- name: Extract safe Diffie-Hellman SSH moduli
ansible.builtin.shell:
cmd: awk '$5 >= 3071' moduli > moduli.safe
chdir: /etc/ssh
creates: moduli.safe
when: check_unsafe_moduli.stdout | length > 0
register: extract_safe_moduli
- name: Replace unsafe Diffie-Hellman SSH moduli
ansible.builtin.command:
cmd: mv moduli.safe moduli
chdir: /etc/ssh
register: replace_small_moduli
when: extract_safe_moduli is changed
notify: reload sshd
- name: Remove DSA and ECDSA host keys
ansible.builtin.file: name=/etc/ssh/{{ item }} state=absent
loop:
- ssh_host_dsa_key
- ssh_host_dsa_key.pub
- ssh_host_ecdsa_key
- ssh_host_ecdsa_key.pub
notify: reload sshd
# vim: set sw=2 ts=2: