The Yubico PAM module provides an easy way to integrate the YubiKey into your existing user authentication infrastructure. The module can be configured to validate YubiKeys against Yubico's YubiCloud infrastructure, a custom YubiKey validation server or it can be used for offline authentication with newer YubiKeys supporting a challenge-response protocol.

WWW: https://github.com/Yubico/yubico-pam
