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OpenVPN

Github Actions (PRs & mainline): Github CI

Travis CI (Actually launching openvpn): Build Status

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 32+
  • CentOS 7 & 8

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 yum install epel-release to ensure openvpn is available.

Ubuntu precise has a weird bug that might make the iptables-persistent install fail. There is a workaround.

Ansible 2.10 and higher

With the release of Ansible 2.10, modules have been moved into collections. With the exception of ansible.builtin modules, this means additonal collections must be installed in order to use modules such as seboolean (now ansible.posix.seboolean). This collections is now required: ansible.posix and this collection is required if using ufw: community.general. Installing the collections:

ansible-galaxy collection install ansible.posix
ansible-galaxy collection install community.general

Support Notes/Expectations

I personally use this role to manage OpenVPN on CentOS 8. 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

Role options

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 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 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

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] [] 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-CBC Set 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 lzo 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

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.
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
  roles:
    - role: kyl191.openvpn
      openvpn_port: 4300
      openvpn_sync_certs: true
      clients:
        - client1
        - client2

Note: As the role will need to know the remote used platform (32 or 64 bits), you must set gather_facts to true in your play.

License

MIT

Author Information

Written by Kyle Lexmond