libjava/classpath/gnu/javax/crypto/sasl/plain/PlainClient.java

   1 /* PlainClient.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.plain;
  40
  41 import gnu.java.lang.CPStringBuilder;
  42
  43 import gnu.java.security.Registry;
  44 import gnu.javax.crypto.sasl.ClientMechanism;
  45
  46 import javax.security.sasl.SaslClient;
  47 import javax.security.sasl.SaslException;
  48 import javax.security.auth.callback.Callback;
  49 import javax.security.auth.callback.NameCallback;
  50 import javax.security.auth.callback.PasswordCallback;
  51
  52 /**
  53  * The PLAIN SASL client-side mechanism.
  54  */
  55 public class PlainClient
  56     extends ClientMechanism
  57     implements SaslClient
  58 {
  59   public PlainClient()
  60   {
  61     super(Registry.SASL_PLAIN_MECHANISM);
  62   }
  63
  64   protected void initMechanism() throws SaslException
  65   {
  66   }
  67
  68   protected void resetMechanism() throws SaslException
  69   {
  70   }
  71
  72   public boolean hasInitialResponse()
  73   {
  74     return true;
  75   }
  76
  77   public byte[] evaluateChallenge(final byte[] challenge) throws SaslException
  78   {
  79     try
  80       {
  81         final String username;
  82         final char[] password;
  83         Callback[] callbacks;
  84         if ((! properties.containsKey(Registry.SASL_USERNAME))
  85             && (! properties.containsKey(Registry.SASL_PASSWORD)))
  86           {
  87             callbacks = new Callback[2];
  88             final NameCallback nameCB;
  89             final String defaultName = System.getProperty("user.name");
  90             if (defaultName == null)
  91               nameCB = new NameCallback("username: ");
  92             else
  93               nameCB = new NameCallback("username: ", defaultName);
  94             final PasswordCallback pwdCB = new PasswordCallback("password: ",
  95                                                                 false);
  96             callbacks[0] = nameCB;
  97             callbacks[1] = pwdCB;
  98             this.handler.handle(callbacks);
  99             username = nameCB.getName();
 100             password = pwdCB.getPassword();
 101           }
 102         else
 103           {
 104             if (properties.containsKey(Registry.SASL_USERNAME))
 105               username = (String) properties.get(Registry.SASL_USERNAME);
 106             else
 107               {
 108                 callbacks = new Callback[1];
 109                 final NameCallback nameCB;
 110                 final String defaultName = System.getProperty("user.name");
 111                 if (defaultName == null)
 112                   nameCB = new NameCallback("username: ");
 113                 else
 114                   nameCB = new NameCallback("username: ", defaultName);
 115                 callbacks[0] = nameCB;
 116                 this.handler.handle(callbacks);
 117                 username = nameCB.getName();
 118               }
 119             if (properties.containsKey(Registry.SASL_PASSWORD))
 120               password = ((String) properties.get(Registry.SASL_PASSWORD)).toCharArray();
 121             else
 122               {
 123                 callbacks = new Callback[1];
 124                 final PasswordCallback pwdCB = new PasswordCallback("password: ",
 125                                                                     false);
 126                 callbacks[0] = pwdCB;
 127                 this.handler.handle(callbacks);
 128                 password = pwdCB.getPassword();
 129               }
 130           }
 131         if (password == null)
 132           throw new SaslException("null password supplied");
 133         final CPStringBuilder sb = new CPStringBuilder();
 134         if (authorizationID != null)
 135           sb.append(authorizationID);
 136         sb.append('\0');
 137         sb.append(username);
 138         sb.append('\0');
 139         sb.append(password);
 140         this.complete = true;
 141         final byte[] response = sb.toString().getBytes("UTF-8");
 142         return response;
 143       }
 144     catch (Exception x)
 145       {
 146         if (x instanceof SaslException)
 147           throw (SaslException) x;
 148         throw new SaslException("evaluateChallenge()", x);
 149       }
 150   }
 151
 152   protected String getNegotiatedQOP()
 153   {
 154     return Registry.QOP_AUTH;
 155   }
 156 }