OpenVPN

Github Actions (PRs & mainline):

This role installs OpenVPN, configures it as a server, sets up networking and firewalls (primarily firewalld, ufw and iptables are best effort), and can optionally create client certificates.

OSes in CI build:

• Fedora 38+
• CentOS 9

Note: I am providing code in the repository to you under an open source license. Because this is my personal repository, the license you receive to my code is from me and not my employer.

Requirements

OpenVPN must be available as a package in yum/dnf/apt! For CentOS users, this role will run dnf install epel-release to ensure openvpn is available.

Ansible 2.10 and higher

With the release of Ansible 2.10, modules have been moved into collections. Two collections are now required:

• ansible.posix
• community.general

Install the collections with:

ansible-galaxy install -r /path/to/ansible-role-openvpn/requirements.yml

Support Notes/Expectations

I personally use this role to manage OpenVPN on CentOS Stream 9. I try to keep the role on that platform fully functional with the default config. Please recognise that I am a single person, and I have a full time job and other commitments.

Responses to any issues will be on a best effort basis on my part, including the possibility that I don't respond at all. Issues arising from use of the non-defaults (including any of the major community contributions) will be deprioritized.

Major community contributions:

• Functionality to revoke certs
• All of the LDAP support

Role Variables

These options change how the role works. This is a catch-all group, specific groups are broken out below.

Variable	Type	Choices	Default	Comment
clients	list		[]	List of clients to add to OpenVPN
openvpn_base_dir	string		/etc/openvpn/server	Path where your OpenVPN config will be stored
openvpn_client_config_no_log	boolean	true, false	true	Prevent client configuration files to be logged to stdout by Ansible
openvpn_key_dir	string		/etc/openvpn/keys	Path where your server private keys and CA will be stored
openvpn_ovpn_dir	string		/etc/openvpn	Path where your client configurations will be stored
openvpn_revoke_these_certs	list		[]	List of client certificates to revoke.
openvpn_selinux_module	string		my-openvpn-server	Set the SELinux module name
openvpn_service_name	string		openvpn-server@{{ openvpn_config_file }}.service	Name of the service. Used by systemctl to start the service
openvpn_sync_certs	boolean	true, false	false	Revoke certificates not explicitly defined in 'clients'
openvpn_uninstall	boolean	true, false	false	Set to true to uninstall the OpenVPN service
openvpn_use_ldap	boolean	true, false	false	Active LDAP backend for authentication. Client certificate not needed anymore
openvpn_use_prebuilt_ldap_plugin	boolean	true, false	true	Use a distro-distributed version of the LDAP plugin

Config fetching

Change these options if you need to adjust how the configs are download to your local system

Variable	Type	Choices	Default	Comment
openvpn_fetch_client_configs	boolean	true, false	true	Download generated client configurations to the local system
openvpn_fetch_client_configs_dir	string		/tmp/ansible	If openvpn_fetch_client_configs is true, the local directory to download the client config files into
openvpn_fetch_client_configs_suffix	string		""	If openvpn_fetch_client_configs is true, the suffix to append to the downloaded client config files before the trailing .ovpn extension

Firewall

Change these options if you need to force a particular firewall or change how the playbook interacts with the firewall.

Variable	Type	Choices	Default	Comment
firewalld_default_interface_zone	string		public	Firewalld zone where the "ansible_default_ipv4.interface" will be pushed into
iptables_service	string		iptables	Override the iptables service name
manage_firewall_rules	boolean	true, false	true	Allow playbook to manage iptables
openvpn_firewall	string	auto, firewalld, ufw, iptables	auto	The firewall software to configure network rules. "auto" will attempt to detect it by inspecting the system
openvpn_masquerade_not_snat	boolean	true, false	false	Set to true if you want to set up MASQUERADE instead of the default SNAT in iptables.

OpenVPN Config Options

These options change how OpenVPN itself works.

Networking

Variable	Type	Choices	Default	Comment
openvpn_client_register_dns	boolean	true, false	true	Add register-dns option to client config (Windows only).
openvpn_client_to_client	boolean	true, false	false	Set to true if you want clients to access each other.
openvpn_custom_dns	list[string]		["1.0.0.1", "1.1.1.1", "8.8.8.8", "8.8.4.4"]	List of DNS servers, only applied if openvpn_set_dns is set to true
openvpn_dualstack	boolean		true	Whether or not to use a dualstack (IPv4 + v6) socket
openvpn_keepalive_ping	int		5	Set keepalive ping interval seconds.
openvpn_keepalive_timeout	int		30	Set keepalive timeout seconds
openvpn_local	string		unset	Local host name or IP address for bind. If specified, OpenVPN will bind to this address only. If unspecified, OpenVPN will bind to all interfaces.
openvpn_port	int		1194	The port you want OpenVPN to run on. If you have different ports on different servers, I suggest you set the port in your inventory file.
openvpn_proto	string	udp, tcp	udp	The protocol you want OpenVPN to use
openvpn_redirect_gateway	boolean	true, false	true	OpenVPN gateway push
openvpn_resolv_retry	int/string	any int, infinite	5	Hostname resolv failure retry seconds. Set "infinite" to retry indefinitely in case of poor connection or laptop sleep mode recovery etc.
openvpn_server_hostname	string		{{ inventory_hostname }}	The server name to place in the client configuration file
openvpn_server_ipv6_network	string		unset	If set, the network address and prefix of an IPv6 network to assign to clients. If True, IPv4 still used too.
openvpn_server_netmask	string		255.255.255.0	Netmask of the private network
openvpn_server_network	string		10.9.0.0	Private network used by OpenVPN service
openvpn_set_dns	boolean	true, false	true	Will push DNS to the client (Cloudflare and Google)
openvpn_tun_mtu	int		unset	Set tun-mtu value. Empty for default.

Security

Variable	Type	Choices	Default	Comment
openvpn_auth_alg	string		SHA256	Set auth authentication algoritm.
openvpn_ca_key	dict		unset	Contain "crt" and "key". If not set, CA cert and key will be automatically generated on the target system.
openvpn_cipher	string		AES-256-GCM:AES-128-GCM:AES-256-CBC	Set data-cipher option for server and client.
openvpn_crl_path	string		unset	Define a path to the CRL file for server revocation check.
openvpn_duplicate_cn	boolean	true, false	false	Add duplicate-cn option to server config - this allows clients to connect multiple times with the one key. NOTE: client ip addresses won't be static anymore!
openvpn_rsa_bits	int		2048	Number of bits used to protect generated certificates
openvpn_script_security	int		1	Set openvpn script security option
openvpn_tls_auth_key	string		unset	Single item with a pre-generated TLS authentication key.
openvpn_use_crl	boolean	true, false	false	Configure OpenVPN server to honor certificate revocation list.
openvpn_use_hardened_tls	boolean	true, false	true	Require a minimum version of TLS 1.2
openvpn_use_modern_tls	boolean	true, false	true	Use modern Cipher for TLS encryption (Not recommended with OpenVPN 2.4)
openvpn_use_pregenerated_dh_params	boolean	true, false	false	DH params are generted with the install by default
openvpn_verify_cn	boolean	true, false	false	Check that the CN of the certificate match the FQDN
tls_auth_required	boolean	true, false	true	Ask the client to push the generated ta.key of the server during the connection

Operations

Variable	Type	Choices	Default	Comment
openvpn_addl_client_options	list		empty	List of user-defined client options that are not already present in the client template. (e.g. - mssfix 1400)
openvpn_addl_server_options	list		empty	List of user-defined server options that are not already present in the server template. (e.g. - ping-timer-rem)
openvpn_compression	string		unset	Set compress compression option. Empty for no compression.
openvpn_config_file	string		openvpn_{{ openvpn_proto }}_{{ openvpn_port }}	The config file name you want to use (set in vars/main.yml)
openvpn_enable_management	boolean	true, false	false
openvpn_ifconfig_pool_persist_file	string		ipp.txt
openvpn_management_bind	string		/var/run/openvpn/management unix	The interface to bind on for the management interface. Can be unix or TCP socket.
openvpn_management_client_user	string		root	Use this user when using a Unix socket for management interface.
openvpn_push	list		empty	Set here a list of string that will be inserted into the config file as push "". E.g - route 10.20.30.0 255.255.255.0 will generate push "route 10.20.30.0 255.255.255.0"
openvpn_script_client_connect	string		unset	Path to your openvpn client-connect script
openvpn_script_client_disconnect	string		unset	Path to your openvpn client-disconnect script
openvpn_script_down	string		unset	Path to your openvpn down script
openvpn_script_up	string		unset	Path to your openvpn up script
openvpn_service_group	string		nogroup	Set the openvpn service group.
openvpn_service_user	string		nobody	Set the openvpn service user.
openvpn_status_version	int	1, 2, 3	1	Define the formatting of the openvpn-status.log file where are listed current client connection
openvpn_topology	string		unset	the "topology" keyword will be set in the server config with the specified value.

OpenVPN custom client config (server pushed)

Variable	Type	Choices	Default	Comment
openvpn_client_config	Boolean		false	Set to true if enable client configuration directory
openvpn_client_config_dir	string		ccd	Path of client-config-dir
openvpn_client_configs	dict		{}	Dict of settings custom client configs

Logrotate/Syslog

Set your own custom logrotate options

Variable	Type	Choices	Default	Comment
openvpn_log_dir	string		/var/log	Set location of openvpn log files. This parameter is a part of log-append configuration value.
openvpn_log_file	string		openvpn.log	Set log filename. This parameter is a part of log-append configuration value. If empty, syslog is used.
openvpn_logrotate_config	string		rotate 4 weekly missingok notifempty sharedscripts copytruncate delaycompress	Configure logrotate script.

Packaging

This role pulls in a bunch of different packages. Override the names as necessary.

Variable	Type	Choices	Default	Comment
epel_package_name	string		epel-release	Name of the epel-release package to install from the package manager
iptables_persistent_package_name	string		iptables-persistent	Name of the iptables-persistent package to install from the package manager
iptables_services_package_name	string		iptables-services	Name of the iptables-services package to install from the package manager
openssl_package_name	string		openssl	Name of the openssl package to install from the package manager
openvpn_ldap_plugin_package_name	string		openvpn-auth-ldap	Name of the openvpn-auth-ldap package to install from the package manager
openvpn_package_name	string		openvpn	Name of the openvpn package to install from the package manager
python_firewall_package_name	string		python-firewall	Name of the python-firewall package to install from the package manager

LDAP object

Variable	Type	Choices	Default	Comment
ldap	dict			Dictionary that contain LDAP configuration
url	string		ldap://host.example.com	Address of you LDAP backend with syntax ldap[s]://host[:port]
anonymous_bind	string	False , True	False	This is not an Ansible boolean but a string that will be pushed into the configuration file.
bind_dn	string		uid=Manager,ou=People,dc=example,dc=com	Bind DN used if "anonymous_bind" set to "False"
bind_password	string		mysecretpassword	Password of the bind_dn user
tls_enable	string	yes , no	no	Force TLS encryption. Not necessary with ldaps addresses
tls_ca_cert_file	string		/etc/openvpn/auth/ca.pem	Path to the CA ldap backend. This must have been pushed before
tls_cert_file	string			Path to client authentication certificate
tls_key_file	string			Path to client authentication key
base_dn	string		ou=People,dc=example,dc=com	Base DN where the backend will look for valid user
search_filter	string		(&(uid=%u)(accountStatus=active))	Filter the ldap search
require_group	string	False , True		This is not an Ansible boolean but a string that will be pushed into the configuration file.
group_base_dn	string		ou=Groups,dc=example,dc=com	Precise the group to look for. Required if require_group is set to "True"
group_search_filter	string		((cn=developers)(cn=artists))	Precise valid groups
verify_client_cert	string	none , optional , require	client-cert-not-required	In OpenVPN 2.4+ client-cert-not-required is deprecated. Use verify-client-cert instead.

Dependencies

Does not depend on any other roles

Example Playbook

- hosts: vpn
  gather_facts: true
  become: true
  roles:
    - role: kyl191.openvpn
      openvpn_port: 4300
      openvpn_sync_certs: true
      clients:
        - client1
        - client2

License

MIT

Author Information

Written by Kyle Lexmond