ansible-role-wireguard/tasks/main.yml

---
- name: Install required packages
  package:
    name: "{{item}}"
    state: present
  with_items:
    - software-properties-common
    - linux-headers-{{ansible_kernel}}

- name : Add WireGuard repository
  apt_repository:
    repo: "ppa:wireguard/wireguard"
    state: present
    update_cache: yes

- name: Install WireGuard
  package:
    name: "{{item}}"
    state: present
  with_items:
    - wireguard-dkms
    - wireguard-tools

- name: Enable WireGuard kernel module
  modprobe:
    name: wireguard
    state: present
  register: wireguard_module_enabled
  until:  wireguard_module_enabled is succeeded
  retries: 10
  delay: 10
  failed_when: wireguard_module_enabled is failure

- name: Create WireGuard certificates directory
  file:
    dest: "{{wireguard_cert_directory}}"
    state: directory
    mode: 0700
  run_once: true
  delegate_to: localhost

- name: Set path to private key file
  set_fact:
    private_key_file_path: "{{wireguard_cert_directory}}/{{inventory_hostname}}.private.key"
  tags:
    wg-config

- name: Set path to public key file
  set_fact:
    public_key_file_path: "{{wireguard_cert_directory}}/{{inventory_hostname}}.public.key"
  tags:
    wg-config

- name: Register if private key already exists
  local_action:
    module: stat
    path: "{{private_key_file_path}}"
  register: private_key_file_stat
  tags:
    - wg-generate-keys

- name: Generate WireGuard private key
  shell: "wg genkey"
  register: wg_private_key_result
  with_inventory_hostnames:
    - vpn
  when: private_key_file_stat.stat.exists == False
  tags:
    - wg-generate-keys

- name: Set private key fact
  set_fact:
    wg_private_key: "{{wg_private_key_result.results[0].stdout}}"
  when: private_key_file_stat.stat.exists == False
  tags:
    - wg-generate-keys

- name: Generate WireGuard public key
  shell: "echo '{{wg_private_key}}' | wg pubkey"
  register: wg_public_key_result
  when: private_key_file_stat.stat.exists == False
  with_inventory_hostnames:
    - vpn
  tags:
    - wg-generate-keys

- name: Set public key fact
  set_fact:
    wg_public_key: "{{wg_public_key_result.results[0].stdout}}"
  when: private_key_file_stat.stat.exists == False
  tags:
    - wg-generate-keys

- name: Store hosts private key locally
  local_action:
    module: template
    src: "wg-privatekey.j2"
    dest: "{{private_key_file_path}}"
    mode: 0600
  when: private_key_file_stat.stat.exists == False
  tags:
    - wg-generate-keys

- name: Store hosts public key locally
  local_action:
    module: template
    src: "wg-publickey.j2"
    dest: "{{public_key_file_path}}"
    mode: 0600
  when: private_key_file_stat.stat.exists == False
  tags:
    - wg-generate-keys

- name: Read private key from local filesystem
  set_fact:
    private_key: "{{lookup('file', private_key_file_path)}}"
  tags:
    wg-config

- name: Read public key from local filesystem
  set_fact:
    public_key: "{{lookup('file', public_key_file_path)}}"
  tags:
    wg-config

- name: Create WireGuard configuration directory
  file:
    dest: "{{wireguard_remote_directory}}"
    state: directory
    mode: 0700
  tags:
    - wg-config

- name: Generate WireGuard configuration file
  template:
    src: wg-fullmesh.conf.j2
    dest: "{{wireguard_remote_directory}}/wg0.conf"
    owner: root
    group: root
    mode: 0600
  tags:
    - wg-config

- name: Start and enable WireGuard service
  service:
    name: wg-quick@wg0
    state: started
    enabled: yes