The Federation authentication module is used by all federation protocols implemented by OpenSSO Enterprise (including SAML v1.x and SAML v2, Liberty ID-FF, and WS-Federation). This module can not be invoked as other authentication modules. (If you do this, you have to provide the necessary authentication callbacks as it will not initiate single sign-on and provide them itself.) The Federation authentication module requires a federation setup and will be invoked internally on the service provider side to create an SSOToken after validating the federation protocol messages. For information on the Federation authentication module attributes, see Federation in Sun OpenSSO Enterprise 8.0 Administration Reference.