SslRMIServerSocketFactory.java

/* SslRMIServerSocketFactory.java --
   Copyright (C) 2006 Free Software Foundation

This file is 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, or (at your option)
any later version.

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WITHOUT ANY WARRANTY; without even the implied warranty of
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Free Software Foundation, Inc., 51 Franklin Street, 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
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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 javax.rmi.ssl;

import java.io.IOException;
import javax.net.ssl.SSLServerSocketFactory;
import javax.net.ssl.SSLServerSocket;
import java.net.ServerSocket;
import java.rmi.server.RMIServerSocketFactory;

/**
 * SslRMIServerSocketFactory
 *
 * This class implements an RMIServerSocketFactory for SSL sockets.
 * it uses the defeult SSLServerSocketFactory.
 *
 * @author Sven de Marothy
 * @since 1.5
 */
public class SslRMIServerSocketFactory implements RMIServerSocketFactory
{
  private String[] enabledCipherSuites, enabledProtocols;
  private boolean needClientAuth;

  /**
   * The SSL ServerSocket factory.
   */
  private static SSLServerSocketFactory socketFactory =
    (SSLServerSocketFactory)SSLServerSocketFactory.getDefault();

  /**
   * Creates a new SslRMIServerSocketFactory with the default socket
   * cipher suites and protocols, and without requiring client authorisation.
   */
  public SslRMIServerSocketFactory()
  {
    enabledCipherSuites = enabledProtocols = null;
    needClientAuth = false;
  }

  /**
   * Creates a new SslRMIServerSocketFactory with a given set of socket
   * cipher suites and protocols. needClientAuth specifies if client
   * authorization is required.
   *
   * @param enabledCipherSuites - the cypher suites to enable
   * or <code>null</code> for the defauls.
   * @param enabledCipherSuites - the protocols to enable,
   * or <code>null</code> for the defauls.
   * @param needClientAuth - specify client authorization requirement.
   * @throws IllegalArgumentException if any of the ciphers or protocols
   *  specified are not available.
   */
  public SslRMIServerSocketFactory(String[] enabledCipherSuites,
                                   String[] enabledProtocols,
                                   boolean needClientAuth)
  {
    this.enabledCipherSuites = enabledCipherSuites;
    this.enabledProtocols = enabledProtocols;
    this.needClientAuth = needClientAuth;
    try
      {
        if( enabledProtocols != null || enabledCipherSuites != null )
          createServerSocket( 0 ); // stupid way to test the parameters
      }
    catch(IOException e)
      {
        // Can this happen? FIXME.
        throw new IllegalArgumentException();
      }
  }

  /**
   * Creates an SSLServerSocket on a given port
   *
   * @throws IOException if an error occurs on socket creation.
   */
  public ServerSocket createServerSocket(int port) throws IOException
  {
    SSLServerSocket socket = (SSLServerSocket)socketFactory.
      createServerSocket( port );
    if( enabledCipherSuites != null )
      socket.setEnabledCipherSuites( enabledCipherSuites );
    if( enabledProtocols != null )
      socket.setEnabledProtocols( enabledProtocols );
    socket.setNeedClientAuth( needClientAuth );
    return socket;
  }

  /**
   * Compare two SslRMIServerSocketFactor instances
   */
  public boolean equals(Object obj)
  {
    if( !(obj instanceof SslRMIServerSocketFactory) )
      return false;
    SslRMIServerSocketFactory s = (SslRMIServerSocketFactory)obj;
    if( needClientAuth != s.needClientAuth )
      return false;

    if(!cmpStrArray(enabledCipherSuites, s.enabledCipherSuites))
      return false;

    if(!cmpStrArray(enabledProtocols, s.enabledProtocols))
      return false;

    return true;
  }

  /**
   * Compare two string arrays.
   */
  static boolean cmpStrArray(String[] a, String[] b)
  {
    if( ( a == null || b == null ) && a != b )
      return false;

    if( a != null )
      {
        if( a.length != b.length )
          return false;
        for( int i = 0; i < a.length; i++ )
          if(!a[i].equals(b[i]))
            return false;
      }

    return true;
  }

  /**
   * Returns the enabled cipher suites, or <code>null</code>
   * if the defaults are to be used.
   * @returns a string array of cipher suite names
   */
  public String[] getEnabledCipherSuites()
  {
    if( enabledCipherSuites == null )
      return null;
    return (String[])enabledCipherSuites.clone();
  }

  /**
   * Returns the enabled protocols, or <code>null</code> if the defaults are
   * to be used.
   *
   * @returns a string array of protocol names
   */
  public String[] getEnabledProtocols()
  {
    if( enabledProtocols == null )
      return null;
    return (String[])enabledProtocols.clone();
  }

  /**
   * Returns whether client authorization is needed.
   */
  public boolean getNeedClientAuth()
  {
    return needClientAuth;
  }

  /**
   * Returns the hash code of this object.
   */
  public int hashCode()
  {
    int hash = 0;
    if( enabledCipherSuites != null )
      for(int i = 0; i < enabledCipherSuites.length; i++ )
        hash = hash ^ enabledCipherSuites[i].hashCode();
    if( enabledProtocols != null )
      for(int i = 0; i < enabledProtocols.length; i++ )
        hash = hash ^ enabledProtocols[i].hashCode();
    hash = ( needClientAuth ) ? (hash^0xFFFF) : hash;
    return hash;
 }
}