Using the PAM authentication plugin
A very useful plugin for OpenVPN is a plugin to validate a username using the Linux/UNIX PAM authentication system. PAM stands for pluggable authentication modules and is a very modular system for allowing users access to system resources. It is used by most modern Linux and UNIX variants, offering a very flexible and extendible system for authenticating and authorizing users. In this recipe, we will use the PAM authentication plugin as a replacement of an auth-user-pass-verify script to validate a remote user's credentials against the system PAM configuration.
Getting ready
Install OpenVPN 2.3 or higher on two computers. Make sure that the computers are connected over a network. Set up the client and server certificates ...
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