YubiAuth provides a user management system which can be used as a base for other systems. It allows the creation of users, which can be authenticated by username, password, and optionally a YubiKey OTP.

Aside from providing a user authentication backend, YubiAuth allows storing and retrieving arbitrary key-value attributes for each user as well as each YubiKey.

Though effort has been made to store password hashes securely, YubiAuth also allows using a YubiHSM for increased security.