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https://github.com/vanitasvitae/Smack.git
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98bf0d8cfb
git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@7071 b35dd754-fafc-0310-a699-88a17e54d16e
429 lines
17 KiB
Java
429 lines
17 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;
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import org.jivesoftware.smack.filter.PacketIDFilter;
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import org.jivesoftware.smack.packet.Bind;
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import org.jivesoftware.smack.packet.IQ;
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import org.jivesoftware.smack.packet.Session;
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import org.jivesoftware.smack.sasl.SASLAnonymous;
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import org.jivesoftware.smack.sasl.SASLMechanism;
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import org.jivesoftware.smack.sasl.SASLPlainMechanism;
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import java.io.IOException;
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import java.lang.reflect.Constructor;
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import java.util.*;
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/**
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* This class is responsible authenticating the user using SASL, binding the resource
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* to the connection and establishing a session with the server.<p>
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*
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* Once TLS has been negotiated (i.e. the connection has been secured) it is possible to
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* register with the server, authenticate using Non-SASL or authenticate using SASL. If the
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* server supports SASL then Smack will first try to authenticate using SASL. But if that
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* fails then Non-SASL will be tried.<p>
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*
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* The server may support many SASL mechanisms to use for authenticating. Out of the box
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* Smack provides SASL PLAIN but it is possible to register new SASL Mechanisms. Use
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* {@link #registerSASLMechanism(int, String, Class)} to add new mechanisms. See
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* {@link SASLMechanism}.<p>
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*
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* Once the user has been authenticated with SASL, it is necessary to bind a resource for
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* the connection. If no resource is passed in {@link #authenticate(String, String, String)}
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* then the server will assign a resource for the connection. In case a resource is passed
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* then the server will receive the desired resource but may assign a modified resource for
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* the connection.<p>
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*
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* Once a resource has been binded and if the server supports sessions then Smack will establish
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* a session so that instant messaging and presence functionalities may be used.
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*
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* @author Gaston Dombiak
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*/
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public class SASLAuthentication implements UserAuthentication {
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private static Map<String, Class> implementedMechanisms = new HashMap<String, Class>();
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private static List<String> mechanismsPreferences = new ArrayList<String>();
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private XMPPConnection connection;
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private Collection<String> serverMechanisms = new ArrayList<String>();
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private SASLMechanism currentMechanism = null;
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/**
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* Boolean indicating if SASL negotiation has finished and was successful.
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*/
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private boolean saslNegotiated;
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/**
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* Boolean indication if SASL authentication has failed. When failed the server may end
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* the connection.
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*/
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private boolean saslFailed;
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private boolean resourceBinded;
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private boolean sessionSupported;
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static {
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// Register SASL mechanisms supported by Smack
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registerSASLMechanism(0, "PLAIN", SASLPlainMechanism.class);
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}
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/**
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* Registers a new SASL mechanism in the specified preference position. The client will try
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* to authenticate using the most prefered SASL mechanism that is also supported by the server.
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* <p/>
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* <p/>
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* Use the <tt>index</tt> parameter to set the level of preference of the new SASL mechanism.
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* A value of 0 means that the mechanism is the most prefered one.
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*
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* @param index preference position amongst all the implemented SASL mechanism. Starts with 0.
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* @param name common name of the SASL mechanism. E.g.: PLAIN, DIGEST-MD5 or KERBEROS_V4.
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* @param mClass a SASLMechanism subclass.
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*/
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public static void registerSASLMechanism(int index, String name, Class mClass) {
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implementedMechanisms.put(name, mClass);
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mechanismsPreferences.add(index, name);
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}
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/**
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* Unregisters an existing SASL mechanism. Once the mechanism has been unregistered it won't
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* be possible to authenticate users using the removed SASL mechanism.
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*
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* @param name common name of the SASL mechanism. E.g.: PLAIN, DIGEST-MD5 or KERBEROS_V4.
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*/
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public static void unregisterSASLMechanism(String name) {
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implementedMechanisms.remove(name);
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mechanismsPreferences.remove(name);
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}
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/**
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* Returns the registerd SASLMechanism classes sorted by the level of preference.
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*
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* @return the registerd SASLMechanism classes sorted by the level of preference.
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*/
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public static List<Class> getRegisterSASLMechanisms() {
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List<Class> answer = new ArrayList<Class>();
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for (String mechanismsPreference : mechanismsPreferences) {
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answer.add(implementedMechanisms.get(mechanismsPreference));
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}
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return answer;
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}
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SASLAuthentication(XMPPConnection connection) {
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super();
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this.connection = connection;
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this.init();
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}
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/**
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* Returns true if the server offered ANONYMOUS SASL as a way to authenticate users.
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*
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* @return true if the server offered ANONYMOUS SASL as a way to authenticate users.
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*/
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public boolean hasAnonymousAuthentication() {
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return serverMechanisms.contains("ANONYMOUS");
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}
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/**
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* Returns true if the server offered SASL authentication besides ANONYMOUS SASL.
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*
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* @return true if the server offered SASL authentication besides ANONYMOUS SASL.
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*/
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public boolean hasNonAnonymousAuthentication() {
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if (!serverMechanisms.isEmpty()) {
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// Check that anonymous sasl is not the only supported mechanism
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if (serverMechanisms.size() == 1) {
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return !hasAnonymousAuthentication();
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}
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return true;
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}
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return false;
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}
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/**
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* Performs SASL authentication of the specified user. If SASL authentication was successful
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* then resource binding and session establishment will be performed. This method will return
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* the full JID provided by the server while binding a resource to the connection.<p>
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*
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* The server may assign a full JID with a username or resource different than the requested
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* by this method.
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*
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* @param username the username that is authenticating with the server.
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* @param password the password to send to the server.
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* @param resource the desired resource.
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* @return the full JID provided by the server while binding a resource to the connection.
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* @throws XMPPException if an error occures while authenticating.
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*/
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public String authenticate(String username, String password, String resource)
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throws XMPPException {
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// Locate the SASLMechanism to use
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Class selected = null;
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for (String mechanism : mechanismsPreferences) {
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if (implementedMechanisms.containsKey(mechanism) &&
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serverMechanisms.contains(mechanism)) {
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selected = implementedMechanisms.get(mechanism);
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break;
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}
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}
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if (selected != null) {
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// A SASL mechanism was found. Authenticate using the selected mechanism and then
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// proceed to bind a resource
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try {
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Constructor constructor = selected
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.getConstructor(new Class[]{SASLAuthentication.class});
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currentMechanism = (SASLMechanism) constructor.newInstance(new Object[]{this});
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// Trigger SASL authentication with the selected mechanism
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currentMechanism.authenticate(username, connection.getServiceName(), password);
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// Wait until SASL negotiation finishes
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synchronized (this) {
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if (!saslNegotiated && !saslFailed) {
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try {
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wait(30000);
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} catch (InterruptedException e) {
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}
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}
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}
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if (saslFailed) {
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// SASL authentication failed and the server may have closed the connection
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// so throw an exception
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throw new XMPPException("SASL authentication failed");
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}
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if (saslNegotiated) {
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// Bind a resource for this connection and
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return bindResourceAndEstablishSession(resource);
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} else {
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// SASL authentication failed so try a Non-SASL authentication
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return new NonSASLAuthentication(connection)
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.authenticate(username, password, resource);
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}
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}
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catch (XMPPException e) {
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throw e;
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}
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catch (Exception e) {
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e.printStackTrace();
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// SASL authentication failed so try a Non-SASL authentication
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return new NonSASLAuthentication(connection)
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.authenticate(username, password, resource);
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}
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} else {
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// No SASL method was found so try a Non-SASL authentication
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return new NonSASLAuthentication(connection).authenticate(username, password, resource);
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}
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}
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/**
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* Performs ANONYMOUS SASL authentication. If SASL authentication was successful
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* then resource binding and session establishment will be performed. This method will return
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* the full JID provided by the server while binding a resource to the connection.<p>
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*
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* The server will assign a full JID with a randomly generated resource and possibly with
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* no username.
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*
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* @return the full JID provided by the server while binding a resource to the connection.
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* @throws XMPPException if an error occures while authenticating.
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*/
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public String authenticateAnonymously() throws XMPPException {
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try {
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currentMechanism = new SASLAnonymous(this);
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currentMechanism.authenticate(null, null, null);
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// Wait until SASL negotiation finishes
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synchronized (this) {
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if (!saslNegotiated && !saslFailed) {
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try {
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wait(5000);
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} catch (InterruptedException e) {
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}
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}
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}
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if (saslFailed) {
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// SASL authentication failed and the server may have closed the connection
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// so throw an exception
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throw new XMPPException("SASL authentication failed");
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}
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if (saslNegotiated) {
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// Bind a resource for this connection and
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return bindResourceAndEstablishSession(null);
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}
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else {
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return new NonSASLAuthentication(connection).authenticateAnonymously();
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}
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} catch (IOException e) {
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return new NonSASLAuthentication(connection).authenticateAnonymously();
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}
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}
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private String bindResourceAndEstablishSession(String resource) throws XMPPException {
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// Wait until server sends response containing the <bind> element
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synchronized (this) {
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if (!resourceBinded) {
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try {
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wait(30000);
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} catch (InterruptedException e) {
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}
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}
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}
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if (!resourceBinded) {
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// Server never offered resource binding
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throw new XMPPException("Resource binding not offered by server");
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}
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Bind bindResource = new Bind();
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bindResource.setResource(resource);
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PacketCollector collector = connection
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.createPacketCollector(new PacketIDFilter(bindResource.getPacketID()));
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// Send the packet
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connection.sendPacket(bindResource);
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// Wait up to a certain number of seconds for a response from the server.
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Bind response = (Bind) collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
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collector.cancel();
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if (response == null) {
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throw new XMPPException("No response from the server.");
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}
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// If the server replied with an error, throw an exception.
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else if (response.getType() == IQ.Type.ERROR) {
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throw new XMPPException(response.getError());
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}
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String userJID = response.getJid();
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if (sessionSupported) {
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Session session = new Session();
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collector = connection.createPacketCollector(new PacketIDFilter(session.getPacketID()));
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// Send the packet
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connection.sendPacket(session);
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// Wait up to a certain number of seconds for a response from the server.
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IQ ack = (IQ) collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
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collector.cancel();
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if (ack == null) {
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throw new XMPPException("No response from the server.");
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}
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// If the server replied with an error, throw an exception.
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else if (ack.getType() == IQ.Type.ERROR) {
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throw new XMPPException(ack.getError());
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}
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}
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else {
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// Server never offered session establishment
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throw new XMPPException("Session establishment not offered by server");
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}
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return userJID;
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}
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/**
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* Sets the available SASL mechanism reported by the server. The server will report the
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* available SASL mechanism once the TLS negotiation was successful. This information is
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* stored and will be used when doing the authentication for logging in the user.
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*
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* @param mechanisms collection of strings with the available SASL mechanism reported
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* by the server.
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*/
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void setAvailableSASLMethods(Collection<String> mechanisms) {
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this.serverMechanisms = mechanisms;
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}
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/**
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* Returns true if the user was able to authenticate with the server usins SASL.
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*
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* @return true if the user was able to authenticate with the server usins SASL.
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*/
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public boolean isAuthenticated() {
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return saslNegotiated;
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}
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/**
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* The server is challenging the SASL authentication we just sent. Forward the challenge
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* to the current SASLMechanism we are using. The SASLMechanism will send a response to
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* the server. The length of the challenge-response sequence varies according to the
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* SASLMechanism in use.
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*
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* @param challenge a base64 encoded string representing the challenge.
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* @throws IOException If a network error occures while authenticating.
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*/
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void challengeReceived(String challenge) throws IOException {
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currentMechanism.challengeReceived(challenge);
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}
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/**
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* Notification message saying that SASL authentication was successful. The next step
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* would be to bind the resource.
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*/
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void authenticated() {
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synchronized (this) {
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saslNegotiated = true;
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// Wake up the thread that is waiting in the #authenticate method
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notify();
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}
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}
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/**
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* Notification message saying that SASL authentication has failed. The server may have
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* closed the connection depending on the number of possible retries.
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*/
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void authenticationFailed() {
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synchronized (this) {
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saslFailed = true;
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// Wake up the thread that is waiting in the #authenticate method
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notify();
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}
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}
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/**
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* Notification message saying that the server requires the client to bind a
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* resource to the stream.
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*/
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void bindingRequired() {
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synchronized (this) {
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resourceBinded = true;
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// Wake up the thread that is waiting in the #authenticate method
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notify();
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}
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}
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public void send(String stanza) throws IOException {
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connection.writer.write(stanza);
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connection.writer.flush();
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}
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/**
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* Notification message saying that the server supports sessions. When a server supports
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* sessions the client needs to send a Session packet after successfully binding a resource
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* for the session.
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*/
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void sessionsSupported() {
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sessionSupported = true;
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}
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/**
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* Initializes the internal state in order to be able to be reused. The authentication
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* is used by the connection at the first login and then reused after the connection
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* is disconnected and then reconnected.
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*/
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protected void init() {
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saslNegotiated = false;
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saslFailed = false;
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resourceBinded = false;
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sessionSupported = false;
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}
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}
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