375 lines
15 KiB
Java
375 lines
15 KiB
Java
/**
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*
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* Copyright 2003-2007 Jive Software.
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*
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* 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 java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.logging.Logger;
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import javax.net.ssl.SSLSession;
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import javax.security.auth.callback.CallbackHandler;
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import org.jivesoftware.smack.SmackException.NoResponseException;
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import org.jivesoftware.smack.XMPPException.XMPPErrorException;
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import org.jivesoftware.smack.packet.Mechanisms;
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import org.jivesoftware.smack.sasl.SASLErrorException;
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import org.jivesoftware.smack.sasl.SASLMechanism;
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import org.jivesoftware.smack.sasl.core.ScramSha1PlusMechanism;
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import org.jivesoftware.smack.sasl.packet.SaslStreamElements.SASLFailure;
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import org.jivesoftware.smack.sasl.packet.SaslStreamElements.Success;
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import org.jxmpp.jid.DomainBareJid;
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import org.jxmpp.jid.EntityBareJid;
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/**
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* <p>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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* <p>Once TLS has been negotiated (i.e. the connection has been secured) it is possible to
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* register with the server or authenticate using SASL. If the
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* server supports SASL then Smack will try to authenticate using SASL..</p>
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*
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* <p>The server may support many SASL mechanisms to use for authenticating. Out of the box
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* Smack provides several SASL mechanisms, but it is possible to register new SASL Mechanisms. Use
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* {@link #registerSASLMechanism(SASLMechanism)} to register a new mechanisms.
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*
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* @see org.jivesoftware.smack.sasl.SASLMechanism
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*
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* @author Gaston Dombiak
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* @author Jay Kline
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*/
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public final class SASLAuthentication {
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private static final Logger LOGGER = Logger.getLogger(SASLAuthentication.class.getName());
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private static final List<SASLMechanism> REGISTERED_MECHANISMS = new ArrayList<>();
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private static final Set<String> BLACKLISTED_MECHANISMS = new HashSet<>();
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static {
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// Blacklist SCRAM-SHA-1-PLUS for now.
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blacklistSASLMechanism(ScramSha1PlusMechanism.NAME);
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}
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/**
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* Registers a new SASL mechanism.
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*
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* @param mechanism a SASLMechanism subclass.
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*/
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public static void registerSASLMechanism(SASLMechanism mechanism) {
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synchronized (REGISTERED_MECHANISMS) {
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REGISTERED_MECHANISMS.add(mechanism);
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Collections.sort(REGISTERED_MECHANISMS);
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}
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}
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/**
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* Returns the registered SASLMechanism sorted by the level of preference.
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*
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* @return the registered SASLMechanism sorted by the level of preference.
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*/
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public static Map<String, String> getRegisterdSASLMechanisms() {
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Map<String, String> answer = new LinkedHashMap<>();
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synchronized (REGISTERED_MECHANISMS) {
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for (SASLMechanism mechanism : REGISTERED_MECHANISMS) {
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answer.put(mechanism.getClass().getName(), mechanism.toString());
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}
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}
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return answer;
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}
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public static boolean isSaslMechanismRegistered(String saslMechanism) {
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synchronized (REGISTERED_MECHANISMS) {
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for (SASLMechanism mechanism : REGISTERED_MECHANISMS) {
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if (mechanism.getName().equals(saslMechanism)) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Unregister a SASLMechanism by it's full class name. For example
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* "org.jivesoftware.smack.sasl.javax.SASLCramMD5Mechanism".
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*
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* @param clazz the SASLMechanism class's name
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* @return true if the given SASLMechanism was removed, false otherwise
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*/
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public static boolean unregisterSASLMechanism(String clazz) {
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synchronized (REGISTERED_MECHANISMS) {
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Iterator<SASLMechanism> it = REGISTERED_MECHANISMS.iterator();
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while (it.hasNext()) {
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SASLMechanism mechanism = it.next();
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if (mechanism.getClass().getName().equals(clazz)) {
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it.remove();
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return true;
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}
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}
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}
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return false;
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}
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public static boolean blacklistSASLMechanism(String mechanism) {
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synchronized (BLACKLISTED_MECHANISMS) {
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return BLACKLISTED_MECHANISMS.add(mechanism);
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}
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}
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public static boolean unBlacklistSASLMechanism(String mechanism) {
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synchronized (BLACKLISTED_MECHANISMS) {
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return BLACKLISTED_MECHANISMS.remove(mechanism);
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}
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}
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public static Set<String> getBlacklistedSASLMechanisms() {
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return Collections.unmodifiableSet(BLACKLISTED_MECHANISMS);
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}
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private final AbstractXMPPConnection connection;
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private final ConnectionConfiguration configuration;
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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 authenticationSuccessful;
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/**
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* Either of type {@link SmackException} or {@link SASLErrorException}
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*/
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private Exception saslException;
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SASLAuthentication(AbstractXMPPConnection connection, ConnectionConfiguration configuration) {
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this.configuration = configuration;
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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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* 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 authzid the authorization identifier (typically null).
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* @param sslSession the optional SSL/TLS session (if one was established)
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* @throws XMPPErrorException
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* @throws SASLErrorException
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* @throws IOException
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* @throws SmackException
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* @throws InterruptedException
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*/
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public void authenticate(String username, String password, EntityBareJid authzid, SSLSession sslSession)
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throws XMPPErrorException, SASLErrorException, IOException,
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SmackException, InterruptedException {
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currentMechanism = selectMechanism(authzid);
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final CallbackHandler callbackHandler = configuration.getCallbackHandler();
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final String host = connection.getHost();
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final DomainBareJid xmppServiceDomain = connection.getXMPPServiceDomain();
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synchronized (this) {
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if (callbackHandler != null) {
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currentMechanism.authenticate(host, xmppServiceDomain, callbackHandler, authzid, sslSession);
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}
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else {
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currentMechanism.authenticate(username, host, xmppServiceDomain, password, authzid, sslSession);
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}
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final long deadline = System.currentTimeMillis() + connection.getReplyTimeout();
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while (!authenticationSuccessful && saslException == null) {
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final long now = System.currentTimeMillis();
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if (now >= deadline) break;
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// Wait until SASL negotiation finishes
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wait(deadline - now);
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}
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}
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if (saslException != null) {
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if (saslException instanceof SmackException) {
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throw (SmackException) saslException;
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} else if (saslException instanceof SASLErrorException) {
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throw (SASLErrorException) saslException;
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} else {
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throw new IllegalStateException("Unexpected exception type" , saslException);
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}
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}
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if (!authenticationSuccessful) {
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throw NoResponseException.newWith(connection, "successful SASL authentication");
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}
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}
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/**
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* Wrapper for {@link #challengeReceived(String, boolean)}, with <code>finalChallenge</code> set
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* to <code>false</code>.
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*
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* @param challenge a base64 encoded string representing the challenge.
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* @throws SmackException
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* @throws InterruptedException
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*/
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public void challengeReceived(String challenge) throws SmackException, InterruptedException {
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challengeReceived(challenge, false);
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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 eventually 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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* @param finalChallenge true if this is the last challenge send by the server within the success stanza
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* @throws SmackException
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* @throws InterruptedException
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*/
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public void challengeReceived(String challenge, boolean finalChallenge) throws SmackException, InterruptedException {
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try {
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currentMechanism.challengeReceived(challenge, finalChallenge);
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} catch (InterruptedException | SmackException e) {
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authenticationFailed(e);
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throw e;
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}
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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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* @throws SmackException
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* @throws InterruptedException
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*/
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public void authenticated(Success success) throws SmackException, InterruptedException {
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// RFC6120 6.3.10 "At the end of the authentication exchange, the SASL server (the XMPP
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// "receiving entity") can include "additional data with success" if appropriate for the
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// SASL mechanism in use. In XMPP, this is done by including the additional data as the XML
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// character data of the <success/> element." The used SASL mechanism should be able to
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// verify the data send by the server in the success stanza, if any.
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if (success.getData() != null) {
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challengeReceived(success.getData(), true);
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}
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currentMechanism.checkIfSuccessfulOrThrow();
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authenticationSuccessful = true;
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// Wake up the thread that is waiting in the #authenticate method
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synchronized (this) {
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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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* @param saslFailure the SASL failure as reported by the server
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* @see <a href="https://tools.ietf.org/html/rfc6120#section-6.5">RFC6120 6.5</a>
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*/
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public void authenticationFailed(SASLFailure saslFailure) {
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authenticationFailed(new SASLErrorException(currentMechanism.getName(), saslFailure));
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}
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public void authenticationFailed(Exception exception) {
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saslException = exception;
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// Wake up the thread that is waiting in the #authenticate method
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synchronized (this) {
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notify();
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}
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}
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public boolean authenticationSuccessful() {
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return authenticationSuccessful;
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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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void init() {
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authenticationSuccessful = false;
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saslException = null;
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}
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String getNameOfLastUsedSaslMechansism() {
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SASLMechanism lastUsedMech = currentMechanism;
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if (lastUsedMech == null) {
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return null;
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}
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return lastUsedMech.getName();
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}
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private SASLMechanism selectMechanism(EntityBareJid authzid) throws SmackException {
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Iterator<SASLMechanism> it = REGISTERED_MECHANISMS.iterator();
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final List<String> serverMechanisms = getServerMechanisms();
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if (serverMechanisms.isEmpty()) {
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LOGGER.warning("Server did not report any SASL mechanisms");
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}
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// Iterate in SASL Priority order over registered mechanisms
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while (it.hasNext()) {
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SASLMechanism mechanism = it.next();
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String mechanismName = mechanism.getName();
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synchronized (BLACKLISTED_MECHANISMS) {
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if (BLACKLISTED_MECHANISMS.contains(mechanismName)) {
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continue;
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}
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}
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if (!configuration.isEnabledSaslMechanism(mechanismName)) {
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continue;
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}
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if (authzid != null) {
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if (!mechanism.authzidSupported()) {
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LOGGER.fine("Skipping " + mechanism + " because authzid is required by not supported by this SASL mechanism");
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continue;
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}
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}
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if (serverMechanisms.contains(mechanismName)) {
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// Create a new instance of the SASLMechanism for every authentication attempt.
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return mechanism.instanceForAuthentication(connection, configuration);
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}
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}
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synchronized (BLACKLISTED_MECHANISMS) {
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// @formatter:off
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throw new SmackException(
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"No supported and enabled SASL Mechanism provided by server. " +
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"Server announced mechanisms: " + serverMechanisms + ". " +
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"Registered SASL mechanisms with Smack: " + REGISTERED_MECHANISMS + ". " +
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"Enabled SASL mechanisms for this connection: " + configuration.getEnabledSaslMechanisms() + ". " +
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"Blacklisted SASL mechanisms: " + BLACKLISTED_MECHANISMS + '.'
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);
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// @formatter;on
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}
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}
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private List<String> getServerMechanisms() {
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Mechanisms mechanisms = connection.getFeature(Mechanisms.ELEMENT, Mechanisms.NAMESPACE);
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if (mechanisms == null) {
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return Collections.emptyList();
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}
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return mechanisms.getMechanisms();
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}
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}
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