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jeremybenn |
/* CramMD5Server.java --
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Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.javax.crypto.sasl.crammd5;
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import gnu.java.security.Registry;
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import gnu.java.security.util.Util;
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import gnu.javax.crypto.sasl.NoSuchUserException;
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import gnu.javax.crypto.sasl.ServerMechanism;
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import java.io.IOException;
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import java.io.UnsupportedEncodingException;
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import java.security.InvalidKeyException;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Map;
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import javax.security.sasl.AuthenticationException;
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import javax.security.sasl.SaslException;
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import javax.security.sasl.SaslServer;
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/**
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* The CRAM-MD5 SASL server-side mechanism.
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*/
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public class CramMD5Server
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extends ServerMechanism
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implements SaslServer
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{
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private byte[] msgID;
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public CramMD5Server()
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{
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super(Registry.SASL_CRAM_MD5_MECHANISM);
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}
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protected void initMechanism() throws SaslException
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{
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}
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protected void resetMechanism() throws SaslException
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{
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}
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public byte[] evaluateResponse(final byte[] response) throws SaslException
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{
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if (state == 0)
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{
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msgID = CramMD5Util.createMsgID();
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state++;
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return msgID;
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}
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final String responseStr = new String(response);
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final int index = responseStr.lastIndexOf(" ");
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final String username = responseStr.substring(0, index);
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final byte[] responseDigest;
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try
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{
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responseDigest = responseStr.substring(index + 1).getBytes("UTF-8");
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}
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catch (UnsupportedEncodingException x)
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{
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throw new AuthenticationException("evaluateResponse()", x);
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}
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// Look up the password
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final char[] password = lookupPassword(username);
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// Compute the digest
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byte[] digest;
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try
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{
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digest = CramMD5Util.createHMac(password, msgID);
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}
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catch (InvalidKeyException x)
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{
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throw new AuthenticationException("evaluateResponse()", x);
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}
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try
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{
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digest = Util.toString(digest).toLowerCase().getBytes("UTF-8");
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}
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catch (UnsupportedEncodingException x)
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{
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throw new AuthenticationException("evaluateResponse()", x);
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}
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// Compare the received and computed digests
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if (! Arrays.equals(digest, responseDigest))
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throw new AuthenticationException("Digest mismatch");
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state++;
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return null;
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}
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public boolean isComplete()
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{
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return (state == 2);
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}
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protected String getNegotiatedQOP()
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{
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return Registry.QOP_AUTH;
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}
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private char[] lookupPassword(final String userName) throws SaslException
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{
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try
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{
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if (! authenticator.contains(userName))
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throw new NoSuchUserException(userName);
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final Map userID = new HashMap();
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userID.put(Registry.SASL_USERNAME, userName);
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final Map credentials = authenticator.lookup(userID);
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final String password = (String) credentials.get(Registry.SASL_PASSWORD);
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if (password == null)
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throw new AuthenticationException("lookupPassword()",
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new InternalError());
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return password.toCharArray();
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}
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catch (IOException x)
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{
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if (x instanceof SaslException)
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throw (SaslException) x;
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throw new AuthenticationException("lookupPassword()", x);
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}
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}
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}
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