Source for gnu.javax.crypto.sasl.crammd5.CramMD5Client

   1: /* CramMD5Client.java --
   2:    Copyright (C) 2003, 2006 Free Software Foundation, Inc.
   3: 
   4: This file is a part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2 of the License, or (at
   9: your option) any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; if not, write to the Free Software
  18: Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
  19: USA
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version.  */
  37: 
  38: 
  39: package gnu.javax.crypto.sasl.crammd5;
  40: 
  41: import gnu.java.security.Registry;
  42: import gnu.java.security.util.Util;
  43: import gnu.javax.crypto.sasl.ClientMechanism;
  44: 
  45: import java.io.IOException;
  46: import java.security.InvalidKeyException;
  47: 
  48: import javax.security.auth.callback.Callback;
  49: import javax.security.auth.callback.NameCallback;
  50: import javax.security.auth.callback.PasswordCallback;
  51: import javax.security.auth.callback.UnsupportedCallbackException;
  52: import javax.security.sasl.AuthenticationException;
  53: import javax.security.sasl.SaslClient;
  54: import javax.security.sasl.SaslException;
  55: 
  56: /**
  57:  * The CRAM-MD5 SASL client-side mechanism.
  58:  */
  59: public class CramMD5Client
  60:     extends ClientMechanism
  61:     implements SaslClient
  62: {
  63:   public CramMD5Client()
  64:   {
  65:     super(Registry.SASL_CRAM_MD5_MECHANISM);
  66:   }
  67: 
  68:   protected void initMechanism() throws SaslException
  69:   {
  70:   }
  71: 
  72:   protected void resetMechanism() throws SaslException
  73:   {
  74:   }
  75: 
  76:   public boolean hasInitialResponse()
  77:   {
  78:     return false;
  79:   }
  80: 
  81:   public byte[] evaluateChallenge(final byte[] challenge) throws SaslException
  82:   {
  83:     if (challenge == null)
  84:       throw new SaslException("null challenge");
  85:     try
  86:       {
  87:         final String username;
  88:         final char[] password;
  89:         Callback[] callbacks;
  90:         if ((! properties.containsKey(Registry.SASL_USERNAME))
  91:             && (! properties.containsKey(Registry.SASL_PASSWORD)))
  92:           {
  93:             callbacks = new Callback[2];
  94:             final NameCallback nameCB;
  95:             final String defaultName = System.getProperty("user.name");
  96:             if (defaultName == null)
  97:               nameCB = new NameCallback("username: ");
  98:             else
  99:               nameCB = new NameCallback("username: ", defaultName);
 100:             final PasswordCallback pwdCB = new PasswordCallback("password: ",
 101:                                                                 false);
 102:             callbacks[0] = nameCB;
 103:             callbacks[1] = pwdCB;
 104:             this.handler.handle(callbacks);
 105:             username = nameCB.getName();
 106:             password = pwdCB.getPassword();
 107:           }
 108:         else
 109:           {
 110:             if (properties.containsKey(Registry.SASL_USERNAME))
 111:               username = (String) properties.get(Registry.SASL_USERNAME);
 112:             else
 113:               {
 114:                 callbacks = new Callback[1];
 115:                 final NameCallback nameCB;
 116:                 final String defaultName = System.getProperty("user.name");
 117:                 if (defaultName == null)
 118:                   nameCB = new NameCallback("username: ");
 119:                 else
 120:                   nameCB = new NameCallback("username: ", defaultName);
 121:                 callbacks[0] = nameCB;
 122:                 this.handler.handle(callbacks);
 123:                 username = nameCB.getName();
 124:               }
 125: 
 126:             if (properties.containsKey(Registry.SASL_PASSWORD))
 127:               password = ((String) properties.get(Registry.SASL_PASSWORD)).toCharArray();
 128:             else
 129:               {
 130:                 callbacks = new Callback[1];
 131:                 final PasswordCallback pwdCB = new PasswordCallback("password: ",
 132:                                                                     false);
 133:                 callbacks[0] = pwdCB;
 134:                 this.handler.handle(callbacks);
 135:                 password = pwdCB.getPassword();
 136:               }
 137:           }
 138:         if (password == null)
 139:           throw new SaslException("null password supplied");
 140:         final byte[] digest;
 141:         try
 142:           {
 143:             digest = CramMD5Util.createHMac(password, challenge);
 144:           }
 145:         catch (InvalidKeyException x)
 146:           {
 147:             throw new AuthenticationException("evaluateChallenge()", x);
 148:           }
 149:         final String response = username + " "
 150:                                 + Util.toString(digest).toLowerCase();
 151:         this.complete = true;
 152:         return response.getBytes("UTF-8");
 153:       }
 154:     catch (UnsupportedCallbackException x)
 155:       {
 156:         throw new AuthenticationException("evaluateChallenge()", x);
 157:       }
 158:     catch (IOException x)
 159:       {
 160:         throw new AuthenticationException("evaluateChallenge()", x);
 161:       }
 162:   }
 163: 
 164:   protected String getNegotiatedQOP()
 165:   {
 166:     return Registry.QOP_AUTH;
 167:   }
 168: }