senderaddressvalidationscanner.java

spam source codejasen-0.9jASEN - java Anti Spam ENgine.zip 如标题所示

/*
 * @(#)SenderAddressValidationScanner.java	30/10/2004
 *
 * Copyright (c) 2004, 2005  jASEN.org
 * 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 names of the authors may not be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 *   4. Any modification or additions to the software must be contributed back
 *      to the project.
 *
 *   5. Any investigation or reverse engineering of source code or binary to
 *      enable emails to bypass the filters, and hence inflict spam and or viruses
 *      onto users who use or do not use jASEN could subject the perpetrator to
 *      criminal and or civil liability.
 *
 * 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 JASEN.ORG,
 * OR ANY CONTRIBUTORS TO THIS SOFTWARE 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.
 *
 */
package org.jasen.plugins;

import java.util.Properties;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

import org.jasen.core.ProbabilityTestResult;
import org.jasen.core.engine.Jasen;
import org.jasen.error.JasenException;
import org.jasen.interfaces.JasenMessage;
import org.jasen.interfaces.JasenPlugin;
import org.jasen.interfaces.JasenTestResult;
import org.jasen.interfaces.ParserData;
import org.jasen.interfaces.ReceivedHeaderParser;
import org.jasen.util.MimeUtils;


/**
 * <P>
 * Validates the forged status of the sender.
 * </P>
 * <p>
 * A sender is deemed to have been forged IFF:
 * <ul>
 * 	<li>The sending MTA publicised a name (HELO) which either does not exist in the DNS, or does not match the recorded IP address for that sending MTA</li>
 * </ul>
 * </p>
 * @author Jason Polites
 */
public class SenderAddressValidationScanner implements JasenPlugin
{

    private float highProb = 0.9f;
    private float lowProb = 0.1f;
    private float medProb = 0.5f;

    /**
     *
     */
    public SenderAddressValidationScanner() {
        super ();
    }

    /*
     * (non-Javadoc)
     * @see org.jasen.interfaces.JasenPlugin#destroy()
     */
    public void destroy() throws JasenException {}

    /*
     *  (non-Javadoc)
     * @see org.jasen.interfaces.JasenPlugin#test(org.jasen.core.Jasen, javax.mail.internet.MimeMessage, org.jasen.interfaces.JasenMessage, org.jasen.interfaces.ParserData, org.jasen.interfaces.ReceivedHeaderParser)
     */
    public JasenTestResult test(Jasen engine, MimeMessage rawMessage, JasenMessage parsedMessage, ParserData data, ReceivedHeaderParser parser) throws JasenException  {

        ProbabilityTestResult result = new ProbabilityTestResult();

        try
        {
            int forgery = MimeUtils.isForgery(engine.getInetAddressResolver(), rawMessage, parsedMessage.getEnvelopeSender(), parser);
            switch (forgery) {
        		case MimeUtils.FORGERY_CONFIRMED:
        		    result.setProbability(highProb);
        		break;

        		case MimeUtils.FORGERY_REJECTED:
        		    result.setProbability(lowProb);
        		break;

        		default:
        		    result.setProbability(medProb);
        		break;
            }
        }
        catch (JasenException e)
        {
            // Couldn't parse the headers
            result.setProbability(medProb);
            throw e;
        }
        catch (MessagingException e)
        {
            result.setProbability(medProb);
            throw new JasenException(e);
        }

        return result;
    }

    public void init(Properties properties) throws JasenException {
        if(properties != null) {

            String strHi = properties.getProperty ("max");
            String strLo = properties.getProperty ("min");
            String strMed = properties.getProperty ("medium");

            if (strHi != null)
                highProb = Float.parseFloat (strHi);

            if (strLo != null)
                lowProb = Float.parseFloat (strLo);

            if (strMed != null)
                medProb = Float.parseFloat (strMed);

         }

    }
}