Damian Minkov
16 years ago
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/*
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* SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
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*
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* Distributable under LGPL license.
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* See terms of license at gnu.org.
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*/
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package net.java.sip.communicator.impl.protocol.jabber.sasl;
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import java.io.*;
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import java.util.*;
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import javax.security.auth.callback.*;
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import javax.security.sasl.*;
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import org.jivesoftware.smack.*;
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import org.jivesoftware.smack.util.Base64;
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/**
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* Creates our custom SASLDigestMD5Mechanism with some changes in order
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* to be compatible with some jabber servers.
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* @author Damian Minkov
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*/
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public class SASLDigestMD5Mechanism
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extends org.jivesoftware.smack.sasl.SASLDigestMD5Mechanism
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{
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/**
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* Creates our mechanism.
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* @param saslAuthentication
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*/
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public SASLDigestMD5Mechanism(SASLAuthentication saslAuthentication)
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{
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super(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 inflexible. 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)
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throws IOException, XMPPException
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{
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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, null, "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 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, CallbackHandler cbh)
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throws IOException, XMPPException
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{
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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, null, "xmpp", host, props, cbh);
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authenticate();
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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)
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throws IOException
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{
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// Build the challenge response stanza encoding the response text
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StringBuilder stanza = new StringBuilder();
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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 = null;
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if(null != response) {
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authenticationText = Base64.encodeBytes(response,Base64.DONT_BREAK_LINES);
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}
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if((null == authenticationText) || (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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