/*
 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.jndi.ldap.sasl;

import javax.security.auth.callback.*;
import javax.security.sasl.RealmCallback;
import javax.security.sasl.RealmChoiceCallback;
import java.io.IOException;

DefaultCallbackHandler for satisfying NameCallback and PasswordCallback for an LDAP client. NameCallback is used for getting the authentication ID and is gotten from the java.naming.security.principal property. PasswordCallback is gotten from the java.naming.security.credentials property and must be of type String, char[] or byte[]. If byte[], it is assumed to have UTF-8 encoding. If the caller of getPassword() will be using the password as a byte array, then it should encode the char[] array returned by getPassword() into a byte[] using UTF-8.
Author:Rosanna Lee
/** * DefaultCallbackHandler for satisfying NameCallback and * PasswordCallback for an LDAP client. * NameCallback is used for getting the authentication ID and is * gotten from the java.naming.security.principal property. * PasswordCallback is gotten from the java.naming.security.credentials * property and must be of type String, char[] or byte[]. * If byte[], it is assumed to have UTF-8 encoding. * * If the caller of getPassword() will be using the password as * a byte array, then it should encode the char[] array returned by * getPassword() into a byte[] using UTF-8. * * @author Rosanna Lee */
final class DefaultCallbackHandler implements CallbackHandler { private char[] passwd; private String authenticationID; private String authRealm; DefaultCallbackHandler(String principal, Object cred, String realm) throws IOException { authenticationID = principal; authRealm = realm; if (cred instanceof String) { passwd = ((String)cred).toCharArray(); } else if (cred instanceof char[]) { passwd = ((char[])cred).clone(); } else if (cred != null) { // assume UTF-8 encoding String orig = new String((byte[])cred, "UTF8"); passwd = orig.toCharArray(); } } public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException { for (int i = 0; i < callbacks.length; i++) { if (callbacks[i] instanceof NameCallback) { ((NameCallback)callbacks[i]).setName(authenticationID); } else if (callbacks[i] instanceof PasswordCallback) { ((PasswordCallback)callbacks[i]).setPassword(passwd); } else if (callbacks[i] instanceof RealmChoiceCallback) { /* Deals with a choice of realms */ String[] choices = ((RealmChoiceCallback)callbacks[i]).getChoices(); int selected = 0; if (authRealm != null && authRealm.length() > 0) { selected = -1; // no realm chosen for (int j = 0; j < choices.length; j++) { if (choices[j].equals(authRealm)) { selected = j; } } if (selected == -1) { StringBuffer allChoices = new StringBuffer(); for (int j = 0; j < choices.length; j++) { allChoices.append(choices[j] + ","); } throw new IOException("Cannot match " + "'java.naming.security.sasl.realm' property value, '" + authRealm + "' with choices " + allChoices + "in RealmChoiceCallback"); } } ((RealmChoiceCallback)callbacks[i]).setSelectedIndex(selected); } else if (callbacks[i] instanceof RealmCallback) { /* 1 or 0 realms specified in challenge */ RealmCallback rcb = (RealmCallback) callbacks[i]; if (authRealm != null) { rcb.setText(authRealm); // Use what user supplied } else { String defaultRealm = rcb.getDefaultText(); if (defaultRealm != null) { rcb.setText(defaultRealm); // Use what server supplied } else { rcb.setText(""); // Specify no realm } } } else { throw new UnsupportedCallbackException(callbacks[i]); } } } void clearPassword() { if (passwd != null) { for (int i = 0; i < passwd.length; i++) { passwd[i] = '\0'; } passwd = null; } } protected void finalize() throws Throwable { clearPassword(); } }