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jeremybenn |
/* CramMD5Client.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.ClientMechanism;
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import java.io.IOException;
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import java.security.InvalidKeyException;
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import javax.security.auth.callback.Callback;
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import javax.security.auth.callback.NameCallback;
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import javax.security.auth.callback.PasswordCallback;
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import javax.security.auth.callback.UnsupportedCallbackException;
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import javax.security.sasl.AuthenticationException;
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import javax.security.sasl.SaslClient;
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import javax.security.sasl.SaslException;
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/**
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* The CRAM-MD5 SASL client-side mechanism.
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*/
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public class CramMD5Client
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extends ClientMechanism
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implements SaslClient
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{
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public CramMD5Client()
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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 boolean hasInitialResponse()
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{
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return false;
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}
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public byte[] evaluateChallenge(final byte[] challenge) throws SaslException
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{
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if (challenge == null)
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throw new SaslException("null challenge");
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try
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{
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final String username;
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final char[] password;
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Callback[] callbacks;
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if ((! properties.containsKey(Registry.SASL_USERNAME))
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&& (! properties.containsKey(Registry.SASL_PASSWORD)))
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{
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callbacks = new Callback[2];
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final NameCallback nameCB;
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final String defaultName = System.getProperty("user.name");
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if (defaultName == null)
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nameCB = new NameCallback("username: ");
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else
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nameCB = new NameCallback("username: ", defaultName);
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final PasswordCallback pwdCB = new PasswordCallback("password: ",
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false);
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callbacks[0] = nameCB;
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callbacks[1] = pwdCB;
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this.handler.handle(callbacks);
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username = nameCB.getName();
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password = pwdCB.getPassword();
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}
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else
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{
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if (properties.containsKey(Registry.SASL_USERNAME))
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username = (String) properties.get(Registry.SASL_USERNAME);
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else
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{
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callbacks = new Callback[1];
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final NameCallback nameCB;
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final String defaultName = System.getProperty("user.name");
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if (defaultName == null)
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nameCB = new NameCallback("username: ");
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else
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nameCB = new NameCallback("username: ", defaultName);
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callbacks[0] = nameCB;
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this.handler.handle(callbacks);
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username = nameCB.getName();
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}
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if (properties.containsKey(Registry.SASL_PASSWORD))
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password = ((String) properties.get(Registry.SASL_PASSWORD)).toCharArray();
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else
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{
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callbacks = new Callback[1];
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final PasswordCallback pwdCB = new PasswordCallback("password: ",
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false);
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callbacks[0] = pwdCB;
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this.handler.handle(callbacks);
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password = pwdCB.getPassword();
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}
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}
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if (password == null)
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throw new SaslException("null password supplied");
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final byte[] digest;
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try
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{
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digest = CramMD5Util.createHMac(password, challenge);
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}
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catch (InvalidKeyException x)
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{
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throw new AuthenticationException("evaluateChallenge()", x);
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}
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final String response = username + " "
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+ Util.toString(digest).toLowerCase();
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this.complete = true;
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return response.getBytes("UTF-8");
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}
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catch (UnsupportedCallbackException x)
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{
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throw new AuthenticationException("evaluateChallenge()", x);
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}
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catch (IOException x)
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{
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throw new AuthenticationException("evaluateChallenge()", x);
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}
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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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}
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