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https://codeberg.org/Mercury-IM/Smack
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babc992e11
git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@10429 b35dd754-fafc-0310-a699-88a17e54d16e
199 lines
8 KiB
Java
199 lines
8 KiB
Java
/**
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* $RCSfile$
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* $Revision: $
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* $Date: $
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*
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* Copyright 2003-2007 Jive Software.
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*
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* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.sasl;
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import org.jivesoftware.smack.XMPPException;
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import org.jivesoftware.smack.SASLAuthentication;
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import org.jivesoftware.smack.util.Base64;
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import java.io.IOException;
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import java.util.Map;
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import java.util.HashMap;
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import javax.security.auth.callback.CallbackHandler;
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import javax.security.auth.callback.UnsupportedCallbackException;
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import javax.security.auth.callback.Callback;
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import javax.security.auth.callback.NameCallback;
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import javax.security.auth.callback.PasswordCallback;
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import javax.security.sasl.RealmCallback;
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import javax.security.sasl.RealmChoiceCallback;
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import javax.security.sasl.Sasl;
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import javax.security.sasl.SaslClient;
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import javax.security.sasl.SaslException;
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/**
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* Base class for SASL mechanisms. Subclasses must implement these methods:
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* <ul>
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* <li>{@link #getName()} -- returns the common name of the SASL mechanism.</li>
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* </ul>
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* Subclasses will likely want to implement their own versions of these mthods:
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* <li>{@link #authenticate(String, String, String)} -- Initiate authentication stanza using the
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* deprecated method.</li>
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* <li>{@link #authenticate(String, String, CallbackHandler)} -- Initiate authentication stanza
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* using the CallbackHandler method.</li>
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* <li>{@link #challengeReceived(String)} -- Handle a challenge from the server.</li>
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* </ul>
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*
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* @author Jay Kline
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*/
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public abstract class SASLMechanism implements CallbackHandler {
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private SASLAuthentication saslAuthentication;
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protected SaslClient sc;
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protected String authenticationId;
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protected String password;
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protected String hostname;
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public SASLMechanism(SASLAuthentication saslAuthentication) {
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this.saslAuthentication = saslAuthentication;
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}
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/**
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* Builds and sends the <tt>auth</tt> stanza to the server. Note that this method of
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* authentication is not recommended, since it is very inflexable. Use
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* {@link #authenticate(String, String, CallbackHandler)} whenever possible.
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*
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* @param username the username of the user being authenticated.
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* @param host the hostname where the user account resides.
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* @param password the password for this account.
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* @throws IOException If a network error occurs while authenticating.
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* @throws XMPPException If a protocol error occurs or the user is not authenticated.
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*/
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public void authenticate(String username, String host, String password) throws IOException, XMPPException {
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//Since we were not provided with a CallbackHandler, we will use our own with the given
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//information
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//Set the authenticationID as the username, since they must be the same in this case.
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this.authenticationId = username;
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this.password = password;
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this.hostname = host;
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String[] mechanisms = { getName() };
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Map<String,String> props = new HashMap<String,String>();
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sc = Sasl.createSaslClient(mechanisms, username, "xmpp", host, props, this);
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authenticate();
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}
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/**
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* Builds and sends the <tt>auth</tt> stanza to the server. The callback handler will handle
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* any additional information, such as the authentication ID or realm, if it is needed.
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*
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* @param username the username of the user being authenticated.
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* @param host the hostname where the user account resides.
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* @param cbh the CallbackHandler to obtain user information.
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* @throws IOException If a network error occures while authenticating.
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* @throws XMPPException If a protocol error occurs or the user is not authenticated.
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*/
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public void authenticate(String username, String host, CallbackHandler cbh) throws IOException, XMPPException {
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String[] mechanisms = { getName() };
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Map<String,String> props = new HashMap<String,String>();
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sc = Sasl.createSaslClient(mechanisms, username, "xmpp", host, props, cbh);
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authenticate();
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}
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protected void authenticate() throws IOException, XMPPException {
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StringBuffer stanza = new StringBuffer();
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stanza.append("<auth mechanism=\"").append(getName());
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stanza.append("\" xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\">");
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try {
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if(sc.hasInitialResponse()) {
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byte[] response = sc.evaluateChallenge(new byte[0]);
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String authenticationText = Base64.encodeBytes(response,Base64.DONT_BREAK_LINES);
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if(authenticationText != null && !authenticationText.equals("")) {
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stanza.append(authenticationText);
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}
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}
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} catch (SaslException e) {
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throw new XMPPException("SASL authentication failed", e);
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}
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stanza.append("</auth>");
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// Send the authentication to the server
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getSASLAuthentication().send(stanza.toString());
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}
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/**
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* The server is challenging the SASL mechanism for the stanza he just sent. Send a
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* response to the server's challenge.
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*
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* @param challenge a base64 encoded string representing the challenge.
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* @throws IOException if an exception sending the response occurs.
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*/
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public void challengeReceived(String challenge) throws IOException {
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// Build the challenge response stanza encoding the response text
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StringBuffer stanza = new StringBuffer();
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byte response[];
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if(challenge != null) {
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response = sc.evaluateChallenge(Base64.decode(challenge));
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} else {
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response = sc.evaluateChallenge(null);
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}
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String authenticationText = Base64.encodeBytes(response,Base64.DONT_BREAK_LINES);
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if(authenticationText.equals("")) {
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authenticationText = "=";
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}
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stanza.append("<response xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\">");
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stanza.append(authenticationText);
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stanza.append("</response>");
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// Send the authentication to the server
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getSASLAuthentication().send(stanza.toString());
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}
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/**
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* Returns the common name of the SASL mechanism. E.g.: PLAIN, DIGEST-MD5 or GSSAPI.
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*
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* @return the common name of the SASL mechanism.
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*/
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protected abstract String getName();
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protected SASLAuthentication getSASLAuthentication() {
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return saslAuthentication;
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}
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/**
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*
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*/
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public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
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for (int i = 0; i < callbacks.length; i++) {
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if (callbacks[i] instanceof NameCallback) {
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NameCallback ncb = (NameCallback)callbacks[i];
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ncb.setName(authenticationId);
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} else if(callbacks[i] instanceof PasswordCallback) {
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PasswordCallback pcb = (PasswordCallback)callbacks[i];
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pcb.setPassword(password.toCharArray());
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} else if(callbacks[i] instanceof RealmCallback) {
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RealmCallback rcb = (RealmCallback)callbacks[i];
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rcb.setText(hostname);
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} else if(callbacks[i] instanceof RealmChoiceCallback){
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//unused
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//RealmChoiceCallback rccb = (RealmChoiceCallback)callbacks[i];
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} else {
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throw new UnsupportedCallbackException(callbacks[i]);
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}
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}
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}
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}
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