Source for gnu.javax.crypto.sasl.plain.PlainClient

   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: }