Example: Using the WSLogin configuration to create a basic authentication subject

This example shows how to use the WSLogin application login configuration from within a J2EE (J2EE) application to log in and get a Subject containing the user ID and the password of the target realm.

javax.security.auth.Subject subject = null;

try
{
  // Create a login context using the WSLogin login configuration and specify a  
  // User ID, target realm, and password. Note: If the target_realm_name is the 
  // same as the current realm, an authenticated Subject is created. However, if 
  // the target_realm_name is different from the current realm, a basic 
  // authentication Subject is created that is not validated. This unvalidated 
  // Subject is created so that we can send a request to the different target
  // realm with valid security credentials for that realm.
		javax.security.auth.login.LoginContext ctx = new LoginContext("WSLogin",
			new WSCallbackHandlerImpl("userid", "target_realm_name", "password"));

  // Note: The following code is an alternative that validates the user ID and 
  // password specified against the target realm. The code performs a remote call 
  // to the target server and will return  true if the user ID and password are 
  // valid and false if the user ID and password are not valid. If false is 
  // returned, a WSLoginFailedException exception is created. We can catch 
  // that exception and perform a retry or stop the request from flowing by 
  // allowing that exception to surface out of this login.

  // ALTERNATIVE LOGIN CONTEXT THAT VALIDATES THE USER ID AND PASSWORD TO THE 
  // TARGET REALM

		/****  currently remarked out ****
		java.util.Map appContext = new java.util.HashMap();
		            appContext.put(javax.naming.Context.INITIAL_CONTEXT_FACTORY, 
	                	           "com.ibm.websphere.naming.WsnInitialContextFactory");
		            appContext.put(javax.naming.Context.PROVIDER_URL, 
		                           "corbaloc:iiop:target_host:2809");

		javax.security.auth.login.LoginContext ctx = new LoginContext("WSLogin",
			new WSCallbackHandlerImpl("userid", "target_realm_name", "password", appContext));
		**** currently remarked out  ****/

		// Starts the login	
		ctx.login();

		// Gets the Subject from the context
		subject = ctx.getSubject();
	} 
	catch (javax.security.auth.login.LoginException e)
	{
		throw new com.ibm.websphere.security.auth.WSLoginFailedException (e.getMessage(), e);
	}

	if (subject != null)
	{
		// Defines a privileged action that encapsulates the remote request.
java.security.PrivilegedAction myAction = java.security.PrivilegedAction()
		{
			public Object run()
			{
				// Assumes a proxy is already defined. This example method returns a String
				return proxy.remoteRequest();
			}
		}); 

		// Starts this action using the basic authentication Subject needed for 
     // the target realm security requirements.
		String myResult = (String) com.ibm.websphere.security.auth.WSSubject.doAs 
        (subject, myAction);	
	}

Configure outbound identity mapping to a different target realm