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