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Tomcat example source code file (JAASCallbackHandler.java)

This example Tomcat source code file (JAASCallbackHandler.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

callbackhandler, io, ioexception, jaascallbackhandler, jaascallbackhandler, jaasrealm, namecallback, passwordcallback, passwordcallback, string, string, stringmanager, unsupportedcallbackexception, unsupportedcallbackexception

The Tomcat JAASCallbackHandler.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.apache.catalina.realm;


import java.io.IOException;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;

import org.apache.catalina.util.StringManager;

/**
 * <p>Implementation of the JAAS CallbackHandler interface,
 * used to negotiate delivery of the username and credentials that were
 * specified to our constructor.  No interaction with the user is required
 * (or possible).</p>
 *
 * <p>This CallbackHandler will pre-digest the supplied
 * password, if required by the <code><Realm> element in 
 * <code>server.xml.

* <p>At present, JAASCallbackHandler knows how to handle callbacks of * type <code>javax.security.auth.callback.NameCallback and * <code>javax.security.auth.callback.PasswordCallback.

* * @author Craig R. McClanahan * @author Andrew R. Jaquith * @version $Revision: 543691 $ $Date: 2007-06-02 03:37:08 +0200 (sam., 02 juin 2007) $ */ public class JAASCallbackHandler implements CallbackHandler { // ------------------------------------------------------------ Constructor /** * Construct a callback handler configured with the specified values. * Note that if the <code>JAASRealm instance specifies digested passwords, * the <code>password parameter will be pre-digested here. * * @param realm Our associated JAASRealm instance * @param username Username to be authenticated with * @param password Password to be authenticated with */ public JAASCallbackHandler(JAASRealm realm, String username, String password) { super(); this.realm = realm; this.username = username; if (realm.hasMessageDigest()) { this.password = realm.digest(password); } else { this.password = password; } } // ----------------------------------------------------- Instance Variables /** * The string manager for this package. */ protected static final StringManager sm = StringManager.getManager(Constants.Package); /** * The password to be authenticated with. */ protected String password = null; /** * The associated <code>JAASRealm instance. */ protected JAASRealm realm = null; /** * The username to be authenticated with. */ protected String username = null; // --------------------------------------------------------- Public Methods /** * Retrieve the information requested in the provided <code>Callbacks. * This implementation only recognizes <code>NameCallback and * <code>PasswordCallback instances. * * @param callbacks The set of <code>Callbacks to be processed * * @exception IOException if an input/output error occurs * @exception UnsupportedCallbackException if the login method requests * an unsupported callback type */ public void handle(Callback callbacks[]) throws IOException, UnsupportedCallbackException { for (int i = 0; i < callbacks.length; i++) { if (callbacks[i] instanceof NameCallback) { if (realm.getContainer().getLogger().isTraceEnabled()) realm.getContainer().getLogger().trace(sm.getString("jaasCallback.username", username)); ((NameCallback) callbacks[i]).setName(username); } else if (callbacks[i] instanceof PasswordCallback) { final char[] passwordcontents; if (password != null) { passwordcontents = password.toCharArray(); } else { passwordcontents = new char[0]; } ((PasswordCallback) callbacks[i]).setPassword (passwordcontents); } else { throw new UnsupportedCallbackException(callbacks[i]); } } } }

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