passwdmembershipservice.java

jxta_src_2.41b jxta 2.41b 最新版源码 from www.jxta.org

/*
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" 
 *    must not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL SUN MICROSYSTEMS OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 *
 * $Id: PasswdMembershipService.java,v 1.16 2006/02/22 01:29:46 bondolo Exp $
 */

package net.jxta.impl.membership;

import java.net.MalformedURLException;
import java.net.UnknownServiceException;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;

import net.jxta.document.AdvertisementFactory;
import net.jxta.id.ID;
import net.jxta.id.IDFactory;
import net.jxta.platform.JxtaLoader;
import net.jxta.membership.Authenticator;
import net.jxta.platform.ModuleSpecID;
import net.jxta.protocol.ModuleImplAdvertisement;

import net.jxta.exception.JxtaError;

import net.jxta.impl.loader.RefJxtaLoader;
import net.jxta.impl.peergroup.StdPeerGroup;


/**
 *  The passwd membership service provides a Membership Service implementation
 *  which is based on a password scheme similar to the unix
 *  <code>/etc/passwd</code> system.</code>
 *
 *  @deprecated This service is intended only as a sample and should not be used
 *  for real membership applications. IT IS NOT SECURE. The implementation has
 *  also moved to {@link net.jxta.impl.membership.passwd.PasswdMembershipService}
 *
 * <p/><strong>This implementation is intended mostly as an example of a
 *  simple Membership Service service and <em>not</em> as a practical secure
 *  Membership Service.<strong>
 *
 * @see net.jxta.membership.MembershipService
 *
 **/
public class PasswdMembershipService {
    
    /**
     *  Log4J Logger
     **/
    private static final Logger LOG = Logger.getLogger(PasswdMembershipService.class.getName());
    
    /**
     * Well known service specification identifier: password membership
     */
    public static final ModuleSpecID passwordMembershipSpecID =
    net.jxta.impl.membership.passwd.PasswdMembershipService.passwordMembershipSpecID;
    
    /**
     * Register the "real" password membership service as soon as someone 
     * references this class.
     **/
    static {
            JxtaLoader loader = net.jxta.impl.peergroup.GenericPeerGroup.getJxtaLoader();
        
            ModuleImplAdvertisement implAdv = (ModuleImplAdvertisement) AdvertisementFactory.newAdvertisement( ModuleImplAdvertisement.getAdvertisementType() );
            
            implAdv.setCode( net.jxta.impl.membership.passwd.PasswdMembershipService.class.getName() );
            implAdv.setCompat( StdPeerGroup.STD_COMPAT );
            implAdv.setDescription( "Password Membership Service" );
            implAdv.setModuleSpecID( passwordMembershipSpecID );
            implAdv.setProvider( StdPeerGroup.MODULE_IMPL_STD_PROVIDER );
            implAdv.setUri( StdPeerGroup.MODULE_IMPL_STD_URI );
 
            loader.defineClass( implAdv );
    }
    
    public abstract static class PasswdAuthenticator implements Authenticator {
        
        public abstract void setAuth1Identity( String who );
        
        public abstract String getAuth1Identity();
        
        public abstract void setAuth2_Password( String secret );
        
        protected abstract String getAuth2_Password();
    }
    
    /**
     *  This is the method used to make the password strings. We only provide
     *  one way encoding since we can compare the encoded strings.
     *
     *  <p/>FIXME [e-mail] : switch to use the standard
     *  crypt(3) algorithm for encoding the passwords. The current algorithm has
     *  been breakable since ancient times, crypt(3) is also weak, but harder to
     *  break.
     *
     *   @param source  the string to encode
     *   @return String the encoded version of the password.
     *
     **/
    public static String makePsswd( String source ) {
        /**
         *
         * A->D  B->Q  C->K  D->W  E->H  F->R  G->T  H->E  I->N  J->O  K->G  L->X  M->C
         * N->V  O->Y  P->S  Q->F  R->J  S->P  T->I  U->L  V->Z  W->A  X->B  Y->M  Z->U
         *
         **/
        
        final String xlateTable = "DQKWHRTENOGXCVYSFJPILZABMU";
        
        StringBuffer work = new StringBuffer( source );
        
        for( int eachChar = work.length() - 1; eachChar >=0; eachChar-- ) {
            char aChar = Character.toUpperCase( work.charAt(eachChar) );
            
            int replaceIdx = xlateTable.indexOf( aChar );
            if( -1 != replaceIdx )
                work.setCharAt( eachChar, (char) ('A' + replaceIdx) );
        }
        
        return work.toString();
    }
}