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package javax.security.auth.message;
import java.util.Map;
import javax.security.auth.Subject;
/**
* An implementation of this interface is used to validate received service
* request messages, and to secure service response messages.
*
* @version %I%, %G%
* @see MessageInfo
* @see Subject
*/
public interface ServerAuth {
/**
* Authenticate a received service request.
*
* This method is called to transform the mechanism-specific request
* message acquired by calling getRequestMessage (on messageInfo)
* into the validated application message to be returned to the message
* processing runtime.
* If the received message is a (mechanism-specific) meta-message,
* the method implementation must attempt to transform the meta-message
* into a corresponding mechanism-specific response message, or to the
* validated application request message.
* The runtime will bind a validated application message into the
* the corresponding service invocation.
* <p> This method conveys the outcome of its message processing either
* by returning an AuthStatus value or by throwing an AuthException.
*
* @param messageInfo A contextual object that encapsulates the
* client request and server response objects, and that may be
* used to save state across a sequence of calls made to the
* methods of this interface for the purpose of completing a
* secure message exchange.
*
* @param clientSubject A Subject that represents the source of the
* service
* request. It is used by the method implementation to store
* Principals and credentials validated in the request.
*
* @param serviceSubject A Subject that represents the recipient of the
* service request, or null. It may be used by the method
* implementation as the source of Principals or credentials to
* be used to validate the request. If the Subject is not null,
* the method implementation may add additional Principals or
* credentials (pertaining to the recipient of the service
* request) to the Subject.
*
* @return An AuthStatus object representing the completion status of
* the processing performed by the method.
* The AuthStatus values that may be returned by this method
* are defined as follows:
*
* <ul>
* <li> AuthStatus.SUCCESS when the application request message
* was successfully validated. The validated request message is
* available by calling getRequestMessage on messageInfo.
*
* <li> AuthStatus.SEND_SUCCESS to indicate that validation/processing
* of the request message successfully produced the secured application
* response message (in messageInfo). The secured response message is
* available by calling getResponseMessage on messageInfo.
*
* <li> AuthStatus.SEND_CONTINUE to indicate that message validation is
* incomplete, and that a preliminary response was returned as the
* response message in messageInfo.
*
* When this status value is returned to challenge an
* application request message, the challenged request must be saved
* by the authentication module such that it can be recovered
* when the module's validateRequest message is called to process
* the request returned for the challenge.
*
* <li> AuthStatus.SEND_FAILURE to indicate that message validation failed
* and that an appropriate failure response message is available by
* calling getResponseMessage on messageInfo.
* </ul>
*
* @exception AuthException When the message processing failed without
* establishing a failure response message (in messageInfo).
*/
AuthStatus validateRequest(MessageInfo messageInfo,
Subject clientSubject,
Subject serviceSubject) throws AuthException;
/**
* Secure a service response before sending it to the client.
*
* This method is called to transform the response message acquired by
* calling getResponseMessage (on messageInfo) into the mechanism-specific
* form to be sent by the runtime.
* <p> This method conveys the outcome of its message processing either
* by returning an AuthStatus value or by throwing an AuthException.
*
* @param messageInfo A contextual object that encapsulates the
* client request and server response objects, and that may be
* used to save state across a sequence of calls made to the
* methods of this interface for the purpose of completing a
* secure message exchange.
*
* @param serviceSubject A Subject that represents the source of the
* service
* response, or null. It may be used by the method implementation
* to retrieve Principals and credentials necessary to secure
* the response. If the Subject is not null,
* the method implementation may add additional Principals or
* credentials (pertaining to the source of the service
* response) to the Subject.
*
* @return An AuthStatus object representing the completion status of
* the processing performed by the method.
* The AuthStatus values that may be returned by this method
* are defined as follows:
*
* <ul>
* <li> AuthStatus.SEND_SUCCESS when the application response
* message was successfully secured. The secured response message may be
* obtained by calling getResponseMessage on messageInfo.
*
* <li> AuthStatus.SEND_CONTINUE to indicate that the application response
* message (within messageInfo) was replaced with a security message
* that should elicit a security-specific response (in the form of a
* request) from the peer.
*
* This status value serves to inform the calling runtime that
* (to successfully complete the message exchange) it will
* need to be capable of continuing the message dialog by processing
* at least one additional request/response exchange (after having
* sent the response message returned in messageInfo).
*
* When this status value is returned, the application response must
* be saved by the authentication module such that it can be recovered
* when the module's validateRequest message is called to process
* the elicited response.
*
* <li> AuthStatus.SEND_FAILURE to indicate that a failure occurred while
* securing the response message and that an appropriate failure response
* message is available by calling getResponseMeessage on messageInfo.
* </ul>
*
* @exception AuthException When the message processing failed without
* establishing a failure response message (in messageInfo).
*/
AuthStatus secureResponse(MessageInfo messageInfo, Subject serviceSubject)
throws AuthException;
/**
* Remove method specific principals and credentials from the subject.
*
* @param messageInfo a contextual object that encapsulates the
* client request and server response objects, and that may be
* used to save state across a sequence of calls made to the
* methods of this interface for the purpose of completing a
* secure message exchange.
*
* @param subject the Subject instance from which the Principals and
* credentials are to be removed.
*
* @exception AuthException If an error occurs during the Subject
* processing.
*/
void cleanSubject(MessageInfo messageInfo, Subject subject)
throws AuthException;
}