JaasAuthentication


            package com.ack.security.jaas;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;
/**
 *  This simple jaas application attempts to authenticate a user
 * and reports whether or not the authentication was successful.
 *
 * 
 To run this you need a couple of things:
 * 

 *  -Djava.security.auth.login.config==ack_jaas.config tells the LoginContext
 * which class to use to perform the authentication against, it contains:
 * 
 * Acknowledge {
 * com.ack.security.jaas.module.SimpleLoginModule required debug=true;
 * };
 * 

 *
 * 
 you are going to need xxx and
 * SimpleLoginModule in your class path
 * 
 finally, the JaasLoginCallbackHandler is a class that enables the
 * programmer to specify a class that captures the username and password,
 * that is used by the authentication implementation, e.g. SimpleLoginModule.
 * 

 *
 */
public class JaasAuthentication {
 public static void main(String[] args) {
 // Obtain a LoginContext, needed for authentication. Tell it
 // to use the LoginModule implementation specified by the
 // entry named "xxx" in the JAAS login configuration
 // file and to also use the specified CallbackHandler.
 LoginContext lc = null;
 try {
 lc = new LoginContext("xxx", new JaasLoginCallbackHandler());
 }
 catch( LoginException le ) {
 System.err.println("Cannot create LoginContext. " + le.getMessage());
 }
 catch( SecurityException se ) {
 System.err.println("Cannot create LoginContext. " + se.getMessage());
 }
 finally {
 if( lc == null ) {
 System.exit(-1);
 }
 }
 // attempt authentication
 try {
 lc.login();
 System.out.println("Authentication succeeded!");
 }
 catch( LoginException le ) {
 System.err.println("Authentication failed:\n" + " " + le.getMessage());
 }
 }
}
Security Java
