This is a step-by-step description of how to configure OpenVPN Community Edition VPN for LastPass Universal Proxy using the RADIUS protocol, in order to set LastPass MFA as a secondary authentication method. The following steps contain the Universal Proxy related settings.

1. Install the OpenVPN RADIUS plugin, openvpn-auth-radius, on your server to get the required libraries and configuration files.

   Result: The OpenVPN RADIUS authentication configuration file, radiusplugin.cnf will be installed.

2. Configure the OpenVPN server for RADIUS authentication using the radiusplugin.cnf file. Set the following:

   NAS-Identifier

   OpenVpn

   Service-Type

   5

   Framed-Protocol

   1

   NAS-Port-Type

   5

   NAS-IP-Address

   OpenVPN Community Edition IP address.

   OpenVPNConfig

   Path to the OpenVPN configuration file.

   overwriteccfiles

   true

   acctport

   1813

   authport

   1812

   name

   IP Address or DNS name of Universal Proxy.

   retry

   1

   wait

   61

   sharedsecret

   RADIUS shared secret, which is configured on the LastPass Universal Proxy.

   Example:

   NAS-Identifier=OpenVpn Service-Type=5 Framed-Protocol=1 NAS-Port-Type=5 NAS-IP-Address=<OpenVPN Communitity edition IP address> OpenVPNConfig=/etc/openvpn/server/server.conf overwriteccfiles=true server { acctport=1813 authport=1812 name=<IP Address or DNS name of Universal Proxy> retry=1 # How long should the plugin wait for a response? wait=61 sharedsecret=********* }

3. Add the following to the OpenVPN server configuration file, server.conf:
   1. Path of the configuration file, to read the attributes and use it to authenticate users. For example:

      plugin /usr/lib/openvpn/openvpn-radius-ldap.so /etc/openvpn/radiusplugin.cnf login

   2. Enforce to use username and password for authentication:

      username-as-common-name

   3. Turn off the certificate authentication on the client side:

      client-cert-not-required

   Example:

   port 1194 proto tcp dev tun ca ca.crt cert server.crt key server.key # This file should be kept secret dh dh.pem plugin /usr/lib/openvpn/openvpn-auth-radius.so /etc/openvpn/radiusplugin.cnf login server 10.8.0.0 255.255.255.0 ifconfig-pool-persist /var/log/openvpn/ipp.txt username-as-common-name keepalive 10 120 client-cert-not-required cipher AES-256-GCM user nobody group nogroup persist-key persist-tun status /var/log/openvpn/openvpn-status.log log /var/log/openvpn/openvpn.log log-append /var/log/openvpn/openvpn.log verb 6 explicit-exit-notify 0

4. Enable client username and password authentication, by adding auth-user-pass:

   client
   dev tun
   proto tcp
   remote 20.67.97.220 1194
   resolv-retry infinite
   nobind
   ;user nobody
   ;group nogroup
   persist-key
   persist-tun
   ;remote-cert-tls server
   client-cert-not-required
   username-as-common-name
   ;tls-auth ta.key 1
   auth-user-pass
   cipher AES-256-GCM
   verb 6
   ;mute 20
   <ca>
   -----BEGIN CERTIFICATE-----
   ***********
   -----END CERTIFICATE-----
   </ca>

5. Restart the OpenVPN server to apply the changes.