mirror of
https://github.com/vanitasvitae/Smack.git
synced 2024-11-01 01:35:59 +01:00
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
/**
|
|
* $RCSfile$
|
|
* $Revision: $
|
|
* $Date: $
|
|
*
|
|
* Copyright 2003-2007 Jive Software.
|
|
*
|
|
* All rights reserved. Licensed 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.jivesoftware.smack;
|
|
|
|
import org.jivesoftware.smack.filter.PacketIDFilter;
|
|
import org.jivesoftware.smack.packet.Bind;
|
|
import org.jivesoftware.smack.packet.IQ;
|
|
import org.jivesoftware.smack.packet.Session;
|
|
import org.jivesoftware.smack.sasl.SASLAnonymous;
|
|
import org.jivesoftware.smack.sasl.SASLMechanism;
|
|
import org.jivesoftware.smack.sasl.SASLPlainMechanism;
|
|
|
|
import java.io.IOException;
|
|
import java.lang.reflect.Constructor;
|
|
import java.util.*;
|
|
|
|
/**
|
|
* This class is responsible authenticating the user using SASL, binding the resource
|
|
* to the connection and establishing a session with the server.<p>
|
|
*
|
|
* Once TLS has been negotiated (i.e. the connection has been secured) it is possible to
|
|
* register with the server, authenticate using Non-SASL or authenticate using SASL. If the
|
|
* server supports SASL then Smack will first try to authenticate using SASL. But if that
|
|
* fails then Non-SASL will be tried.<p>
|
|
*
|
|
* The server may support many SASL mechanisms to use for authenticating. Out of the box
|
|
* Smack provides SASL PLAIN but it is possible to register new SASL Mechanisms. Use
|
|
* {@link #registerSASLMechanism(int, String, Class)} to add new mechanisms. See
|
|
* {@link SASLMechanism}.<p>
|
|
*
|
|
* Once the user has been authenticated with SASL, it is necessary to bind a resource for
|
|
* the connection. If no resource is passed in {@link #authenticate(String, String, String)}
|
|
* then the server will assign a resource for the connection. In case a resource is passed
|
|
* then the server will receive the desired resource but may assign a modified resource for
|
|
* the connection.<p>
|
|
*
|
|
* Once a resource has been binded and if the server supports sessions then Smack will establish
|
|
* a session so that instant messaging and presence functionalities may be used.
|
|
*
|
|
* @author Gaston Dombiak
|
|
*/
|
|
public class SASLAuthentication implements UserAuthentication {
|
|
|
|
private static Map<String, Class> implementedMechanisms = new HashMap<String, Class>();
|
|
private static List<String> mechanismsPreferences = new ArrayList<String>();
|
|
|
|
private XMPPConnection connection;
|
|
private Collection<String> serverMechanisms = new ArrayList<String>();
|
|
private SASLMechanism currentMechanism = null;
|
|
/**
|
|
* Boolean indicating if SASL negotiation has finished and was successful.
|
|
*/
|
|
private boolean saslNegotiated;
|
|
/**
|
|
* Boolean indication if SASL authentication has failed. When failed the server may end
|
|
* the connection.
|
|
*/
|
|
private boolean saslFailed;
|
|
private boolean resourceBinded;
|
|
private boolean sessionSupported;
|
|
|
|
static {
|
|
// Register SASL mechanisms supported by Smack
|
|
registerSASLMechanism(0, "PLAIN", SASLPlainMechanism.class);
|
|
}
|
|
|
|
/**
|
|
* Registers a new SASL mechanism in the specified preference position. The client will try
|
|
* to authenticate using the most prefered SASL mechanism that is also supported by the server.
|
|
* <p/>
|
|
* <p/>
|
|
* Use the <tt>index</tt> parameter to set the level of preference of the new SASL mechanism.
|
|
* A value of 0 means that the mechanism is the most prefered one.
|
|
*
|
|
* @param index preference position amongst all the implemented SASL mechanism. Starts with 0.
|
|
* @param name common name of the SASL mechanism. E.g.: PLAIN, DIGEST-MD5 or KERBEROS_V4.
|
|
* @param mClass a SASLMechanism subclass.
|
|
*/
|
|
public static void registerSASLMechanism(int index, String name, Class mClass) {
|
|
implementedMechanisms.put(name, mClass);
|
|
mechanismsPreferences.add(index, name);
|
|
}
|
|
|
|
/**
|
|
* Unregisters an existing SASL mechanism. Once the mechanism has been unregistered it won't
|
|
* be possible to authenticate users using the removed SASL mechanism.
|
|
*
|
|
* @param name common name of the SASL mechanism. E.g.: PLAIN, DIGEST-MD5 or KERBEROS_V4.
|
|
*/
|
|
public static void unregisterSASLMechanism(String name) {
|
|
implementedMechanisms.remove(name);
|
|
mechanismsPreferences.remove(name);
|
|
}
|
|
|
|
/**
|
|
* Returns the registerd SASLMechanism classes sorted by the level of preference.
|
|
*
|
|
* @return the registerd SASLMechanism classes sorted by the level of preference.
|
|
*/
|
|
public static List<Class> getRegisterSASLMechanisms() {
|
|
List<Class> answer = new ArrayList<Class>();
|
|
for (String mechanismsPreference : mechanismsPreferences) {
|
|
answer.add(implementedMechanisms.get(mechanismsPreference));
|
|
}
|
|
return answer;
|
|
}
|
|
|
|
SASLAuthentication(XMPPConnection connection) {
|
|
super();
|
|
this.connection = connection;
|
|
this.init();
|
|
}
|
|
|
|
/**
|
|
* Returns true if the server offered ANONYMOUS SASL as a way to authenticate users.
|
|
*
|
|
* @return true if the server offered ANONYMOUS SASL as a way to authenticate users.
|
|
*/
|
|
public boolean hasAnonymousAuthentication() {
|
|
return serverMechanisms.contains("ANONYMOUS");
|
|
}
|
|
|
|
/**
|
|
* Returns true if the server offered SASL authentication besides ANONYMOUS SASL.
|
|
*
|
|
* @return true if the server offered SASL authentication besides ANONYMOUS SASL.
|
|
*/
|
|
public boolean hasNonAnonymousAuthentication() {
|
|
if (!serverMechanisms.isEmpty()) {
|
|
// Check that anonymous sasl is not the only supported mechanism
|
|
if (serverMechanisms.size() == 1) {
|
|
return !hasAnonymousAuthentication();
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Performs SASL authentication of the specified user. If SASL authentication was successful
|
|
* then resource binding and session establishment will be performed. This method will return
|
|
* the full JID provided by the server while binding a resource to the connection.<p>
|
|
*
|
|
* The server may assign a full JID with a username or resource different than the requested
|
|
* by this method.
|
|
*
|
|
* @param username the username that is authenticating with the server.
|
|
* @param password the password to send to the server.
|
|
* @param resource the desired resource.
|
|
* @return the full JID provided by the server while binding a resource to the connection.
|
|
* @throws XMPPException if an error occures while authenticating.
|
|
*/
|
|
public String authenticate(String username, String password, String resource)
|
|
throws XMPPException {
|
|
// Locate the SASLMechanism to use
|
|
Class selected = null;
|
|
for (String mechanism : mechanismsPreferences) {
|
|
if (implementedMechanisms.containsKey(mechanism) &&
|
|
serverMechanisms.contains(mechanism)) {
|
|
selected = implementedMechanisms.get(mechanism);
|
|
break;
|
|
}
|
|
}
|
|
if (selected != null) {
|
|
// A SASL mechanism was found. Authenticate using the selected mechanism and then
|
|
// proceed to bind a resource
|
|
try {
|
|
Constructor constructor = selected
|
|
.getConstructor(new Class[]{SASLAuthentication.class});
|
|
currentMechanism = (SASLMechanism) constructor.newInstance(new Object[]{this});
|
|
// Trigger SASL authentication with the selected mechanism
|
|
currentMechanism.authenticate(username, connection.getServiceName(), password);
|
|
|
|
// Wait until SASL negotiation finishes
|
|
synchronized (this) {
|
|
if (!saslNegotiated && !saslFailed) {
|
|
try {
|
|
wait(30000);
|
|
} catch (InterruptedException e) {
|
|
}
|
|
}
|
|
}
|
|
|
|
if (saslFailed) {
|
|
// SASL authentication failed and the server may have closed the connection
|
|
// so throw an exception
|
|
throw new XMPPException("SASL authentication failed");
|
|
}
|
|
|
|
if (saslNegotiated) {
|
|
// Bind a resource for this connection and
|
|
return bindResourceAndEstablishSession(resource);
|
|
} else {
|
|
// SASL authentication failed so try a Non-SASL authentication
|
|
return new NonSASLAuthentication(connection)
|
|
.authenticate(username, password, resource);
|
|
}
|
|
}
|
|
catch (XMPPException e) {
|
|
throw e;
|
|
}
|
|
catch (Exception e) {
|
|
e.printStackTrace();
|
|
// SASL authentication failed so try a Non-SASL authentication
|
|
return new NonSASLAuthentication(connection)
|
|
.authenticate(username, password, resource);
|
|
}
|
|
} else {
|
|
// No SASL method was found so try a Non-SASL authentication
|
|
return new NonSASLAuthentication(connection).authenticate(username, password, resource);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Performs ANONYMOUS SASL authentication. If SASL authentication was successful
|
|
* then resource binding and session establishment will be performed. This method will return
|
|
* the full JID provided by the server while binding a resource to the connection.<p>
|
|
*
|
|
* The server will assign a full JID with a randomly generated resource and possibly with
|
|
* no username.
|
|
*
|
|
* @return the full JID provided by the server while binding a resource to the connection.
|
|
* @throws XMPPException if an error occures while authenticating.
|
|
*/
|
|
public String authenticateAnonymously() throws XMPPException {
|
|
try {
|
|
currentMechanism = new SASLAnonymous(this);
|
|
currentMechanism.authenticate(null, null, null);
|
|
|
|
// Wait until SASL negotiation finishes
|
|
synchronized (this) {
|
|
if (!saslNegotiated && !saslFailed) {
|
|
try {
|
|
wait(5000);
|
|
} catch (InterruptedException e) {
|
|
}
|
|
}
|
|
}
|
|
|
|
if (saslFailed) {
|
|
// SASL authentication failed and the server may have closed the connection
|
|
// so throw an exception
|
|
throw new XMPPException("SASL authentication failed");
|
|
}
|
|
|
|
if (saslNegotiated) {
|
|
// Bind a resource for this connection and
|
|
return bindResourceAndEstablishSession(null);
|
|
}
|
|
else {
|
|
return new NonSASLAuthentication(connection).authenticateAnonymously();
|
|
}
|
|
} catch (IOException e) {
|
|
return new NonSASLAuthentication(connection).authenticateAnonymously();
|
|
}
|
|
}
|
|
|
|
private String bindResourceAndEstablishSession(String resource) throws XMPPException {
|
|
// Wait until server sends response containing the <bind> element
|
|
synchronized (this) {
|
|
if (!resourceBinded) {
|
|
try {
|
|
wait(30000);
|
|
} catch (InterruptedException e) {
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!resourceBinded) {
|
|
// Server never offered resource binding
|
|
throw new XMPPException("Resource binding not offered by server");
|
|
}
|
|
|
|
Bind bindResource = new Bind();
|
|
bindResource.setResource(resource);
|
|
|
|
PacketCollector collector = connection
|
|
.createPacketCollector(new PacketIDFilter(bindResource.getPacketID()));
|
|
// Send the packet
|
|
connection.sendPacket(bindResource);
|
|
// Wait up to a certain number of seconds for a response from the server.
|
|
Bind response = (Bind) collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
|
|
collector.cancel();
|
|
if (response == null) {
|
|
throw new XMPPException("No response from the server.");
|
|
}
|
|
// If the server replied with an error, throw an exception.
|
|
else if (response.getType() == IQ.Type.ERROR) {
|
|
throw new XMPPException(response.getError());
|
|
}
|
|
String userJID = response.getJid();
|
|
|
|
if (sessionSupported) {
|
|
Session session = new Session();
|
|
collector = connection.createPacketCollector(new PacketIDFilter(session.getPacketID()));
|
|
// Send the packet
|
|
connection.sendPacket(session);
|
|
// Wait up to a certain number of seconds for a response from the server.
|
|
IQ ack = (IQ) collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
|
|
collector.cancel();
|
|
if (ack == null) {
|
|
throw new XMPPException("No response from the server.");
|
|
}
|
|
// If the server replied with an error, throw an exception.
|
|
else if (ack.getType() == IQ.Type.ERROR) {
|
|
throw new XMPPException(ack.getError());
|
|
}
|
|
}
|
|
else {
|
|
// Server never offered session establishment
|
|
throw new XMPPException("Session establishment not offered by server");
|
|
}
|
|
return userJID;
|
|
}
|
|
|
|
/**
|
|
* Sets the available SASL mechanism reported by the server. The server will report the
|
|
* available SASL mechanism once the TLS negotiation was successful. This information is
|
|
* stored and will be used when doing the authentication for logging in the user.
|
|
*
|
|
* @param mechanisms collection of strings with the available SASL mechanism reported
|
|
* by the server.
|
|
*/
|
|
void setAvailableSASLMethods(Collection<String> mechanisms) {
|
|
this.serverMechanisms = mechanisms;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the user was able to authenticate with the server usins SASL.
|
|
*
|
|
* @return true if the user was able to authenticate with the server usins SASL.
|
|
*/
|
|
public boolean isAuthenticated() {
|
|
return saslNegotiated;
|
|
}
|
|
|
|
/**
|
|
* The server is challenging the SASL authentication we just sent. Forward the challenge
|
|
* to the current SASLMechanism we are using. The SASLMechanism will send a response to
|
|
* the server. The length of the challenge-response sequence varies according to the
|
|
* SASLMechanism in use.
|
|
*
|
|
* @param challenge a base64 encoded string representing the challenge.
|
|
* @throws IOException If a network error occures while authenticating.
|
|
*/
|
|
void challengeReceived(String challenge) throws IOException {
|
|
currentMechanism.challengeReceived(challenge);
|
|
}
|
|
|
|
/**
|
|
* Notification message saying that SASL authentication was successful. The next step
|
|
* would be to bind the resource.
|
|
*/
|
|
void authenticated() {
|
|
synchronized (this) {
|
|
saslNegotiated = true;
|
|
// Wake up the thread that is waiting in the #authenticate method
|
|
notify();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Notification message saying that SASL authentication has failed. The server may have
|
|
* closed the connection depending on the number of possible retries.
|
|
*/
|
|
void authenticationFailed() {
|
|
synchronized (this) {
|
|
saslFailed = true;
|
|
// Wake up the thread that is waiting in the #authenticate method
|
|
notify();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Notification message saying that the server requires the client to bind a
|
|
* resource to the stream.
|
|
*/
|
|
void bindingRequired() {
|
|
synchronized (this) {
|
|
resourceBinded = true;
|
|
// Wake up the thread that is waiting in the #authenticate method
|
|
notify();
|
|
}
|
|
}
|
|
|
|
public void send(String stanza) throws IOException {
|
|
connection.writer.write(stanza);
|
|
connection.writer.flush();
|
|
}
|
|
|
|
/**
|
|
* Notification message saying that the server supports sessions. When a server supports
|
|
* sessions the client needs to send a Session packet after successfully binding a resource
|
|
* for the session.
|
|
*/
|
|
void sessionsSupported() {
|
|
sessionSupported = true;
|
|
}
|
|
|
|
/**
|
|
* Initializes the internal state in order to be able to be reused. The authentication
|
|
* is used by the connection at the first login and then reused after the connection
|
|
* is disconnected and then reconnected.
|
|
*/
|
|
protected void init() {
|
|
saslNegotiated = false;
|
|
saslFailed = false;
|
|
resourceBinded = false;
|
|
sessionSupported = false;
|
|
}
|
|
}
|