edu.internet2.middleware.shibboleth.idp.authn
Class AuthenticationEngine

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          edu.internet2.middleware.shibboleth.idp.authn.AuthenticationEngine

All Implemented Interfaces:

Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class AuthenticationEngine
extends javax.servlet.http.HttpServlet

Manager responsible for handling authentication requests.

See Also:

Serialized Form

Field Summary

static String	IDP_SESSION_COOKIE_NAME Name of the IdP Cookie containing the IdP session ID.
static String	LOGIN_CONTEXT_KEY_NAME Name of the key under which to bind the storage service key for a login context.
static String	LOGIN_CONTEXT_LIFETIME_INIT_PARAM_NAME Name of the Servlet config init parameter that holds lifetime of a login context in the storage service.
static String	LOGIN_CONTEXT_PARTITION_NAME_INIT_PARAM_NAME Name of the Servlet config init parameter that holds the partition name for login contexts.

Constructor Summary

AuthenticationEngine()

Method Summary

protected void	addSessionCookie(javax.servlet.http.HttpServletRequest httpRequest, javax.servlet.http.HttpServletResponse httpResponse, Session userSession) Adds an IdP session cookie to the outbound response.
protected void	completeAuthentication(LoginContext loginContext, javax.servlet.http.HttpServletRequest httpRequest, javax.servlet.http.HttpServletResponse httpResponse) Completes the authentication process.
protected Map<String,LoginHandler>	determinePossibleLoginHandlers(Session idpSession, LoginContext loginContext) Determines which configured login handlers will support the requested authentication methods.
protected void	filterByForceAuthentication(Session idpSession, LoginContext loginContext, Map<String,LoginHandler> loginHandlers) Filters out any login handler based on the requirement for forced authentication.
protected void	filterByPassiveAuthentication(Session idpSession, LoginContext loginContext, Map<String,LoginHandler> loginHandlers) Filters out any login handler that doesn't support passive authentication if the login context indicates passive authentication is required.
protected static void	forwardRequest(String forwardPath, javax.servlet.http.HttpServletRequest httpRequest, javax.servlet.http.HttpServletResponse httpResponse) Forwards a request to the given path.
protected Subject	getLoginHandlerSubject(javax.servlet.http.HttpServletRequest httpRequest) Gets the subject from the request coming back from the login handler.
void	init(javax.servlet.ServletConfig config)
protected Subject	mergeSubjects(Subject subject1, Subject subject2) Merges the principals and public and private credentials from two subjects into a new subject.
protected static LoginContext	retrieveLoginContext(javax.servlet.http.HttpServletRequest httpRequest, boolean removeFromStorageService) Retrieves a login context.
static void	returnToAuthenticationEngine(javax.servlet.http.HttpServletRequest httpRequest, javax.servlet.http.HttpServletResponse httpResponse) Returns control back to the authentication engine.
static void	returnToProfileHandler(LoginContext loginContext, javax.servlet.http.HttpServletRequest httpRequest, javax.servlet.http.HttpServletResponse httpResponse) Returns control back to the profile handler that invoked the authentication engine.
protected void	service(javax.servlet.http.HttpServletRequest httpRequest, javax.servlet.http.HttpServletResponse httpResponse)
protected void	startUserAuthentication(LoginContext loginContext, javax.servlet.http.HttpServletRequest httpRequest, javax.servlet.http.HttpServletResponse httpResponse) Begins the authentication process.
protected void	storeLoginContext(LoginContext loginContext, javax.servlet.http.HttpServletRequest httpRequest, javax.servlet.http.HttpServletResponse httpResponse) Stores the login context in the storage service.
protected void	updateUserSession(LoginContext loginContext, Subject authenticationSubject, String authenticationMethod, javax.servlet.http.HttpServletRequest httpRequest, javax.servlet.http.HttpServletResponse httpResponse) Updates the user's Shibboleth session with authentication information.
protected void	validateForcedReauthentication(Session idpSession, String authnMethod, Subject subject) If forced authentication was required this method checks to ensure that the re-authenticated subject contains a principal name that is equal to the principal name associated with the authentication method.
protected void	validateSuccessfulAuthentication(LoginContext loginContext, javax.servlet.http.HttpServletRequest httpRequest, String authenticationMethod) Validates that the authentication was successfully performed by the login handler.

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doGet, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOGIN_CONTEXT_PARTITION_NAME_INIT_PARAM_NAME

public static final String LOGIN_CONTEXT_PARTITION_NAME_INIT_PARAM_NAME

Name of the Servlet config init parameter that holds the partition name for login contexts.

See Also:

Constant Field Values

LOGIN_CONTEXT_LIFETIME_INIT_PARAM_NAME

public static final String LOGIN_CONTEXT_LIFETIME_INIT_PARAM_NAME

Name of the Servlet config init parameter that holds lifetime of a login context in the storage service.

See Also:

Constant Field Values

IDP_SESSION_COOKIE_NAME

public static final String IDP_SESSION_COOKIE_NAME

Name of the IdP Cookie containing the IdP session ID.

See Also:

Constant Field Values

LOGIN_CONTEXT_KEY_NAME

public static final String LOGIN_CONTEXT_KEY_NAME

Name of the key under which to bind the storage service key for a login context.

See Also:

Constant Field Values

Constructor Detail

AuthenticationEngine

public AuthenticationEngine()

Method Detail

init

public void init(javax.servlet.ServletConfig config)
          throws javax.servlet.ServletException

Specified by:

init in interface javax.servlet.Servlet

Overrides:

init in class javax.servlet.GenericServlet

Throws:

javax.servlet.ServletException

retrieveLoginContext

protected static LoginContext retrieveLoginContext(javax.servlet.http.HttpServletRequest httpRequest,
                                                   boolean removeFromStorageService)

Retrieves a login context.

Parameters:

httpRequest - current HTTP request

removeFromStorageService - whether the login context should be removed from the storage service as it is retrieved

Returns:

the login context or null if one is not available (e.g. because it has expired)

returnToAuthenticationEngine

public static void returnToAuthenticationEngine(javax.servlet.http.HttpServletRequest httpRequest,
                                                javax.servlet.http.HttpServletResponse httpResponse)

Returns control back to the authentication engine.

Parameters:

httpRequest - current HTTP request

httpResponse - current HTTP response

returnToProfileHandler

public static void returnToProfileHandler(LoginContext loginContext,
                                          javax.servlet.http.HttpServletRequest httpRequest,
                                          javax.servlet.http.HttpServletResponse httpResponse)

Returns control back to the profile handler that invoked the authentication engine.

Parameters:

loginContext - current login context

httpRequest - current HTTP request

httpResponse - current HTTP response

forwardRequest

protected static void forwardRequest(String forwardPath,
                                     javax.servlet.http.HttpServletRequest httpRequest,
                                     javax.servlet.http.HttpServletResponse httpResponse)

Forwards a request to the given path.

Parameters:

forwardPath - path to forward the request to

httpRequest - current HTTP request

httpResponse - current HTTP response

service

protected void service(javax.servlet.http.HttpServletRequest httpRequest,
                       javax.servlet.http.HttpServletResponse httpResponse)
                throws javax.servlet.ServletException,
                       IOException

Overrides:

service in class javax.servlet.http.HttpServlet

Throws:

javax.servlet.ServletException

IOException

startUserAuthentication

protected void startUserAuthentication(LoginContext loginContext,
                                       javax.servlet.http.HttpServletRequest httpRequest,
                                       javax.servlet.http.HttpServletResponse httpResponse)

Begins the authentication process. Determines if forced re-authentication is required or if an existing, active, authentication method is sufficient. Also determines, when authentication is required, which handler to use depending on whether passive authentication is required.

Parameters:

loginContext - current login context

httpRequest - current HTTP request

httpResponse - current HTTP response

determinePossibleLoginHandlers

protected Map<String,LoginHandler> determinePossibleLoginHandlers(Session idpSession,
                                                                  LoginContext loginContext)
                                                           throws AuthenticationException

Determines which configured login handlers will support the requested authentication methods.

Parameters:

loginContext - current login context

idpSession - current user's session, or null if they don't have one

Returns:

login methods that may be used to authenticate the user

Throws:

AuthenticationException - thrown if no login handler meets the given requirements

filterByForceAuthentication

protected void filterByForceAuthentication(Session idpSession,
                                           LoginContext loginContext,
                                           Map<String,LoginHandler> loginHandlers)
                                    throws ForceAuthenticationException

Filters out any login handler based on the requirement for forced authentication. During forced authentication any handler that has not previously been used to authenticate the user or any handlers that have been and support force re-authentication may be used. Filter out any of the other ones.

Parameters:

idpSession - user's current IdP session

loginContext - current login context

loginHandlers - login handlers to filter

Throws:

ForceAuthenticationException - thrown if no handlers remain after filtering

filterByPassiveAuthentication

protected void filterByPassiveAuthentication(Session idpSession,
                                             LoginContext loginContext,
                                             Map<String,LoginHandler> loginHandlers)
                                      throws PassiveAuthenticationException

Filters out any login handler that doesn't support passive authentication if the login context indicates passive authentication is required.

Parameters:

idpSession - user's current IdP session

loginContext - current login context

loginHandlers - login handlers to filter

Throws:

PassiveAuthenticationException - thrown if no handlers remain after filtering

storeLoginContext

protected void storeLoginContext(LoginContext loginContext,
                                 javax.servlet.http.HttpServletRequest httpRequest,
                                 javax.servlet.http.HttpServletResponse httpResponse)

Stores the login context in the storage service. The key for the stored login context is then bound to an HTTP request attribute and set a cookie.

Parameters:

loginContext - login context to store

httpRequest - current HTTP request

httpResponse - current HTTP response

completeAuthentication

protected void completeAuthentication(LoginContext loginContext,
                                      javax.servlet.http.HttpServletRequest httpRequest,
                                      javax.servlet.http.HttpServletResponse httpResponse)

Completes the authentication process. The principal name set by the authentication handler is retrieved and pushed in to the login context, a Shibboleth session is created if needed, information indicating that the user has logged into the service is recorded and finally control is returned back to the profile handler.

Parameters:

loginContext - current login context

httpRequest - current HTTP request

httpResponse - current HTTP response

validateSuccessfulAuthentication

protected void validateSuccessfulAuthentication(LoginContext loginContext,
                                                javax.servlet.http.HttpServletRequest httpRequest,
                                                String authenticationMethod)
                                         throws AuthenticationException

Validates that the authentication was successfully performed by the login handler. An authentication is considered successful if no error is bound to the request attribute LoginHandler.AUTHENTICATION_ERROR_KEY and there is a value for at least one of the following request attributes: LoginHandler.SUBJECT_KEY, LoginHandler.PRINCIPAL_KEY, or LoginHandler.PRINCIPAL_NAME_KEY.

Parameters:

loginContext - current login context

httpRequest - current HTTP request

authenticationMethod - the authentication method used to authenticate the user

Throws:

AuthenticationException - thrown if the authentication was not successful

getLoginHandlerSubject

protected Subject getLoginHandlerSubject(javax.servlet.http.HttpServletRequest httpRequest)
                                  throws AuthenticationException

Gets the subject from the request coming back from the login handler.

Parameters:

httpRequest - request coming back from the login handler

Returns:

the Subject created from the request

Throws:

AuthenticationException - thrown if no subject can be retrieved from the request

validateForcedReauthentication

protected void validateForcedReauthentication(Session idpSession,
                                              String authnMethod,
                                              Subject subject)
                                       throws AuthenticationException

If forced authentication was required this method checks to ensure that the re-authenticated subject contains a principal name that is equal to the principal name associated with the authentication method. If this is the first time the subject has authenticated with this method than this check always passes.

Parameters:

idpSession - user's IdP session

authnMethod - method used to authenticate the user

subject - subject that was authenticated

Throws:

AuthenticationException - thrown if this check fails

updateUserSession

protected void updateUserSession(LoginContext loginContext,
                                 Subject authenticationSubject,
                                 String authenticationMethod,
                                 javax.servlet.http.HttpServletRequest httpRequest,
                                 javax.servlet.http.HttpServletResponse httpResponse)

Updates the user's Shibboleth session with authentication information. If no session exists a new one will be created.

Parameters:

loginContext - current login context

authenticationSubject - subject created from the authentication method

authenticationMethod - the method used to authenticate the subject

httpRequest - current HTTP request

httpResponse - current HTTP response

mergeSubjects

protected Subject mergeSubjects(Subject subject1,
                                Subject subject2)

Merges the principals and public and private credentials from two subjects into a new subject.

Parameters:

subject1 - first subject to merge, may be null

subject2 - second subject to merge, may be null

Returns:

subject containing the merged information

addSessionCookie

protected void addSessionCookie(javax.servlet.http.HttpServletRequest httpRequest,
                                javax.servlet.http.HttpServletResponse httpResponse,
                                Session userSession)

Adds an IdP session cookie to the outbound response.

Parameters:

httpRequest - current request

httpResponse - current response

userSession - user's session