The SPAttributeMapper interface is used by the service provider to map attributes received in an assertion to its local attributes. The default implementation, com.sun.identity.saml2.plugins.DefaultSPAttributeMapper, retrieves the attribute mappings defined in the attributeMap property in the service provider's extended metadata configuration file. It extracts the value of the SAML v2 attribute from the assertion and returns a key/value mapping which will be set in the user's single sign-on token. The mapper can also be customized to choose user attributes from the local service provider datastore.
*=* is a special attribute mapping which can be defined for a service provider hosted on an instance of OpenSSO Enterprise only. (It is not valid for a remote service provider configured on the identity provider side.) It will map all the attribute names as presented in the Assertion. (It will keep the same name as in the AttributeStatement element. Enter this as a value of the Attribute Map property under the service provider configuration Assertion Processing tab.