gcc/libjava/classpath/gnu/javax/crypto/sasl/plain/PlainServer.java

/* PlainServer.java -- 
   Copyright (C) 2003, 2006 Free Software Foundation, Inc.

This file is a part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
USA

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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package gnu.javax.crypto.sasl.plain;

import gnu.java.security.Registry;
import gnu.javax.crypto.sasl.NoSuchUserException;
import gnu.javax.crypto.sasl.ServerMechanism;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.StringTokenizer;

import javax.security.sasl.SaslException;
import javax.security.sasl.SaslServer;

/**
 * <p>The PLAIN SASL server-side mechanism.</p>
 */
public class PlainServer extends ServerMechanism implements SaslServer
{

  // Constants and variables
  // -------------------------------------------------------------------------

  // Constructor(s)
  // -------------------------------------------------------------------------

  public PlainServer()
  {
    super(Registry.SASL_PLAIN_MECHANISM);
  }

  // Class methods
  // -------------------------------------------------------------------------

  // Instance methods
  // -------------------------------------------------------------------------

  // abstract methods implementation -----------------------------------------

  protected void initMechanism() throws SaslException
  {
  }

  protected void resetMechanism() throws SaslException
  {
  }

  // javax.security.sasl.SaslServer interface implementation -----------------

  public byte[] evaluateResponse(final byte[] response) throws SaslException
  {
    if (response == null)
      {
        return null;
      }
    try
      {
        final String nullStr = new String("\0");
        final StringTokenizer strtok = new StringTokenizer(
                                                           new String(response),
                                                           nullStr, true);

        authorizationID = strtok.nextToken();
        if (!authorizationID.equals(nullStr))
          {
            strtok.nextToken();
          }
        else
          {
            authorizationID = null;
          }
        final String id = strtok.nextToken();
        if (id.equals(nullStr))
          {
            throw new SaslException("No identity given");
          }
        if (authorizationID == null)
          {
            authorizationID = id;
          }
        if ((!authorizationID.equals(nullStr)) && (!authorizationID.equals(id)))
          {
            throw new SaslException("Delegation not supported");
          }
        strtok.nextToken();
        final byte[] pwd;
        try
          {
            pwd = strtok.nextToken().getBytes("UTF-8");
          }
        catch (UnsupportedEncodingException x)
          {
            throw new SaslException("evaluateResponse()", x);
          }
        if (pwd == null)
          {
            throw new SaslException("No password given");
          }
        final byte[] password;
        try
          {
            password = new String(lookupPassword(id)).getBytes("UTF-8");
          }
        catch (UnsupportedEncodingException x)
          {
            throw new SaslException("evaluateResponse()", x);
          }
        if (!Arrays.equals(pwd, password))
          {
            throw new SaslException("Password incorrect");
          }
        this.complete = true;
        return null;
      }
    catch (NoSuchElementException x)
      {
        throw new SaslException("evaluateResponse()", x);
      }
  }

  protected String getNegotiatedQOP()
  {
    return Registry.QOP_AUTH;
  }

  // other methods -----------------------------------------------------------

  private char[] lookupPassword(final String userName) throws SaslException
  {
    try
      {
        if (!authenticator.contains(userName))
          {
            throw new NoSuchUserException(userName);
          }
        final Map userID = new HashMap();
        userID.put(Registry.SASL_USERNAME, userName);
        final Map credentials = authenticator.lookup(userID);
        final String password = (String) credentials.get(Registry.SASL_PASSWORD);
        if (password == null)
          {
            throw new SaslException("lookupPassword()", new InternalError());
          }
        return password.toCharArray();
      }
    catch (IOException x)
      {
        if (x instanceof SaslException)
          {
            throw (SaslException) x;
          }
        throw new SaslException("lookupPassword()", x);
      }
  }
}