PAM uses the Ubuntu's user management to authenticate against so we don't need to manage an extra database of username and passwords. PAM authentication is the simplest form of username/password authentication we can use with OpenVPN. A username and password using PAM, and a challenge request using a YubiKey's U2F support. This guide will add two more authentication steps. This guide assumes you have followed one of our server setup guides and you are already able to connect to the server we will be modifying using certificate/key authentication. Your OpenVPN server has a Fully Qualified Domain Name (FQDN), more information below.You have a YubiCo YubiKey that supports U2F.You already have a copy of Viscosity installed on your client device and already setup for this server.You have already an OpenVPN server running using one of our guides.You have root access to this installation.You have already installed the latest version of Ubuntu LTS ( 22.04 at time of writing).This guide will expand on setting up an OpenVPN server on Ubuntu by adding U2F support to that server using Viscosity's built in U2F support. One type of 2FA is U2F (Universal Two Factor) with a YubiKey. This adds another security measure to prevent unwanted users connecting to your server. ![]() One way to do that is to use 2FA (Two Factor Authentication). ![]() After setting up your own OpenVPN server, you may want to enhance it's security.
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