Source for gnu.inet.util.SaslPlain

   1: /*
   2:  * SaslPlain.java
   3:  * Copyright (C) 2004 The Free Software Foundation
   4:  * 
   5:  * This file is part of GNU inetlib, a library.
   6:  * 
   7:  * GNU inetlib is free software; you can redistribute it and/or modify
   8:  * it under the terms of the GNU General Public License as published by
   9:  * the Free Software Foundation; either version 2 of the License, or
  10:  * (at your option) any later version.
  11:  * 
  12:  * GNU inetlib is distributed in the hope that it will be useful,
  13:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15:  * GNU General Public License for more details.
  16:  * 
  17:  * You should have received a copy of the GNU General Public License
  18:  * along with this library; if not, write to the Free Software
  19:  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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:  * obliged to do so.  If you do not wish to do so, delete this
  36:  * exception statement from your version.
  37:  */
  38: 
  39: package gnu.inet.util;
  40: 
  41: import java.io.UnsupportedEncodingException;
  42: import javax.security.sasl.SaslClient;
  43: import javax.security.sasl.SaslException;
  44: 
  45: /**
  46:  * SASL mechanism for PLAIN.
  47:  *
  48:  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  49:  */
  50: public class SaslPlain
  51:   implements SaslClient
  52: {
  53: 
  54:   private String username;
  55:   private String password;
  56:   private boolean complete;
  57: 
  58:   public SaslPlain(String username, String password)
  59:   {
  60:     this.username = username;
  61:     this.password = password;
  62:   }
  63: 
  64:   public String getMechanismName()
  65:   {
  66:     return "PLAIN";
  67:   }
  68: 
  69:   public boolean hasInitialResponse()
  70:   {
  71:     return true;
  72:   }
  73: 
  74:   public byte[] evaluateChallenge(byte[] challenge)
  75:     throws SaslException
  76:   {
  77:     try
  78:       {
  79:         byte[] a = username.getBytes("UTF-8");
  80:         byte[] b = password.getBytes("UTF-8");
  81:         byte[] c = new byte[(a.length * 2) + b.length + 2];
  82:         System.arraycopy(a, 0, c, 0, a.length);
  83:         System.arraycopy(a, 0, c, a.length + 1, a.length);
  84:         System.arraycopy(b, 0, c, (a.length * 2) + 2, b.length);
  85:         complete = true;
  86:         return c;
  87:       }
  88:     catch (UnsupportedEncodingException e)
  89:       {
  90:         String msg = "Username or password contains illegal UTF-8";
  91:         throw new SaslException(msg, e);
  92:       }
  93:   }
  94: 
  95:   public boolean isComplete()
  96:   {
  97:     return complete;
  98:   }
  99: 
 100:   public byte[] unwrap(byte[] incoming, int off, int len)
 101:     throws SaslException
 102:   {
 103:     byte[] ret = new byte[len - off];
 104:     System.arraycopy(incoming, off, ret, 0, len);
 105:     return ret;
 106:   }
 107: 
 108:   public byte[] wrap(byte[] outgoing, int off, int len)
 109:     throws SaslException
 110:   {
 111:     byte[] ret = new byte[len - off];
 112:     System.arraycopy(outgoing, off, ret, 0, len);
 113:     return ret;
 114:   }
 115: 
 116:   public Object getNegotiatedProperty(String name)
 117:   {
 118:     return null;
 119:   }
 120: 
 121:   public void dispose()
 122:   {
 123:   }
 124:   
 125: }