StrongSwan role

Tested on:

• Ubuntu 18.04 and 20.04
• CentOS 7 and 8
• Debian 9 and 10

This role uses a swanctl.conf-style syntax (referencing sections, since 5.7.0).

Variables

General

• strongswan_swanctl_settings: [required]: Set all settings for swanctl.conf

StrongSwan (server|clients) settings:

• strongswan_swanctl_config_dir: [optional, default: /etc/strongswan/swanctl]: Directory which contains StrongSwan swanctl.conf
• strongswan_swanctl_config_file: [optional, default: {{ strongswan_swanctl_config_dir }}/swanctl.conf]: The name of StrongSwan swanctl configuration file
• strongswan_letsencrypt_enable: [optional, default: true]: Prepare StrongSwan server certificate with Let'sEncrypt
• strongswan_firewalld_enable: [optional, default true]: Set all needed firewall rules for StrongSwan server
• strongswan_client: [optional, default false]: Install and configure StrongSwan on clients
• strongswan_download_cert: [optional, default false]: Download StrongSwan certificate from server host. Should be used with strongswan_letsencrypt_enable = true
• strongswan_upload_cert: [optional, default false]: Upload StrongSwan certificate to clients. Should be used with strongswan_letsencrypt_enable = true

Dependencies

• geerlingguy.certbot

Variables

Host vars for StrongSwan Server:

# Enable variable below only for first certificate generating
certbot_create_if_missing: yes

certbot_certs:
  - email: [email protected]
    domains:
      - "{{ inventory_hostname }}"

certbot_create_standalone_stop_services: []

# Set StrongSwan swanctl configuration
# https://wiki.strongswan.org/projects/strongswan/wiki/UsableExamples
strongswan_swanctl_settings:
  connections:
    ikev2-eap:
      version: 2
      rekey_time:  0s
      fragmentation: yes
      proposals: aes192gcm16-aes128gcm16-prfsha256-ecp256-ecp521,aes192-sha256-modp3072,default
      encap: yes
      pools: primary-pool-ipv4
      dpd_delay: 30s
      local-1:
        certs: cert.pem
        id: myid
      remote-1:
        auth: eap-dynamic
        eap_id: "%any"
      children:
        ikev2-eap:
          local_ts: 0.0.0.0/0,::/0
          rekey_time: 0s
          dpd_action: clear
          esp_proposals = aes192gcm16-aes128gcm16-prfsha256-ecp256-modp3072,aes192-sha256-ecp256-modp3072,default
  pools:
    primary-pool-ipv4:
      addrs: 192.168.252.0/24
  secrets:
    eap-user:
      id: user
      secret: Ar3e73tTnp02

Host vars for carol.strongswan.org:

strongswan_swanctl_settings:
  connections:
    home:
      encap: yes
      vips: 0.0.0.0
      remote_addrs: moon.strongswan.org
      version: 2
      children:
        home:
          remote_ts: 0.0.0.0/0,::/0
          start_action: none
      local:
        auth: eap-aka
        eap_id: carol
      remote:
        auth: pubkey
        id: moon.strongswan.org
  secrets:
    eap-carol:
      id: carol
      secret: Ar3etTnp

Playbook Examples

StrongSwan server with PKI certificates playbook:

- hosts: server
  vars:
    strongswan_letsencrypt_enable: false
  roles:
    - hybridadmin.strongswan

StrongSwan server with Letsencrypt certificates playbook:

- hosts: server
  vars:
    strongswan_letsencrypt_enable: true
    certbot_certs:
      - email: [email protected]
        domains:
          - vpn.example.com
  roles:
    - hybridadmin.strongswan

StrongSwan clients playbook:

- hosts:
    - server
  roles:
    - hybridadmin.strongswan
  vars:
    strongswan_client: true
    strongswan_download_cert: true

- hosts:
    - clients
  roles:
    - hybridadmin.strongswan
  vars:
    strongswan_upload_cert: true

Todo

1. Remove some dependencies roles to achieve more flexibility.

License

BSD 2-clause "Simplified" license

Author Information

hybridadmin