---
- ansible.builtin.debug:
    msg: "Warning: empty 'evolinux_ssh_password_auth_addresses' variable, tasks will be skipped!"
  when: evolinux_ssh_password_auth_addresses == []

# From 'man sshd_config' :
# « If all of the criteria on the Match line are satisfied, the keywords
# on the following lines override those set in the global section of the config
# file, until either another Match line or the end of the file.
# If a keyword appears in multiple Match blocks that are satisfied,
# only the first instance of the keyword is applied. »
#
# We want to allow any user from a list of IP addresses to login with password,
# but users of the "{{ evolinux_internal_group }}" group can't login with password from other IP addresses

- name: "Security directives for Evolinux (Debian 10 or later)"
  ansible.builtin.blockinfile:
    dest: /etc/ssh/sshd_config
    marker: "# {mark} EVOLINUX PASSWORD RESTRICTIONS"
    block: |
      Match Address {{ evolinux_ssh_password_auth_addresses | join(',') }}
          PasswordAuthentication yes
      Match Group {{ evolinux_internal_group }}
          PasswordAuthentication no
    insertafter: EOF
    validate: '/usr/sbin/sshd -t -f %s'
  notify: reload sshd
  when:
    - evolinux_ssh_password_auth_addresses != []
    - ansible_distribution_major_version is version('10', '>=')

- name: Security directives for Evolinux (Jessie/Stretch)
  ansible.builtin.blockinfile:
    dest: /etc/ssh/sshd_config
    marker: "# {mark} EVOLINUX PASSWORD RESTRICTIONS BY ADDRESS"
    block: |
      Match Address {{ evolinux_ssh_password_auth_addresses | join(',') }}
          PasswordAuthentication yes
    insertafter: EOF
    validate: '/usr/sbin/sshd -t -f %s'
  notify: reload sshd
  when:
    - evolinux_ssh_password_auth_addresses != []
    - ansible_distribution_major_version is version('10', '<')

# We disable AcceptEnv because it can be a security issue, but also because we
# do not want clients to push their environment variables like LANG.
- name: disable AcceptEnv in ssh config
  ansible.builtin.replace:
    dest: /etc/ssh/sshd_config
    regexp: '^AcceptEnv'
    replace: "#AcceptEnv"
  notify: reload sshd
  when: evolinux_ssh_disable_acceptenv | bool

- name: Set log level to verbose (for Debian >= 9)
  ansible.builtin.replace:
    dest: /etc/ssh/sshd_config
    regexp: '^#?LogLevel [A-Z]+'
    replace: "LogLevel VERBOSE"
  notify: reload sshd
  when: ansible_distribution_major_version is version('9', '>=')

- name: "Get current user"
  ansible.builtin.command:
    cmd: logname
  changed_when: False
  register: logname
  check_mode: no
  when: evolinux_ssh_allow_current_user | bool

# we must double-escape caracters, because python
- name: verify AllowUsers directive
  ansible.builtin.command:
    cmd: "grep -E '^AllowUsers' /etc/ssh/sshd_config"
  failed_when: False
  changed_when: False
  register: grep_allowusers_ssh
  check_mode: no
  when: evolinux_ssh_allow_current_user | bool

- name: "Add AllowUsers sshd directive for current user"
  ansible.builtin.lineinfile:
    dest: /etc/ssh/sshd_config
    line: "\nAllowUsers {{ logname.stdout }}"
    insertafter: 'Subsystem'
    validate: '/usr/sbin/sshd -t -f %s'
  notify: reload sshd
  when: evolinux_ssh_allow_current_user and grep_allowusers_ssh.rc != 0

- name: "Modify AllowUsers sshd directive for current user"
  ansible.builtin.replace:
    dest: /etc/ssh/sshd_config
    regexp: '^(AllowUsers ((?!{{ logname.stdout }}).)*)$'
    replace: '\1 {{ logname.stdout }}'
    validate: '/usr/sbin/sshd -t -f %s'
  notify: reload sshd
  when: evolinux_ssh_allow_current_user and grep_allowusers_ssh.rc == 0

- ansible.builtin.meta: flush_handlers
