EasySSLProtocolSocketFactory.java

/*
 * ====================================================================
 *
 *  Copyright 2002-2004 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */

package org.apache.commons.httpclient.contrib.ssl;

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

import javax.net.ssl.SSLSocketFactory;

import org.apache.commons.httpclient.ConnectTimeoutException;
import org.apache.commons.httpclient.HttpClientError;
import org.apache.commons.httpclient.params.HttpConnectionParams;
import org.apache.commons.httpclient.protocol.ControllerThreadSocketFactory;
import org.apache.commons.httpclient.protocol.ReflectionSocketFactory;
import org.apache.commons.httpclient.protocol.SecureProtocolSocketFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.sun.net.ssl.SSLContext;
import com.sun.net.ssl.TrustManager;

/**
 * <p>
 * EasySSLProtocolSocketFactory can be used to creats SSL {@link Socket}s 
 * that accept self-signed certificates. 
 * </p>
 * <p>
 * This socket factory SHOULD NOT be used for productive systems 
 * due to security reasons, unless it is a concious decision and 
 * you are perfectly aware of security implications of accepting 
 * self-signed certificates
 * </p>
 * 
 * @author <a href="mailto:oleg@ural.ru">Oleg Kalnichevski</a>
 * 
 * DISCLAIMER: HttpClient developers DO NOT actively support this component.
 * The component is provided as a reference material, which may be inappropriate
 * to be used without additional customization.
 */

public class EasySSLProtocolSocketFactory implements SecureProtocolSocketFactory {

    /** Log object for this class. */
    private static final Log LOG = LogFactory.getLog(EasySSLProtocolSocketFactory.class);

    private static SSLContext SSL_CONTEXT_SINGLETON = null;
    /**
     * Constructor for EasySSLProtocolSocketFactory.
     * 
     * Code sample:
     *  
     *     <blockquote>
     *     Protocol easyhttps = new Protocol( 
     *         "https", new EasySSLProtocolSocketFactory(), 443);
     *
     *     HttpClient client = new HttpClient();
     *     client.getHostConfiguration().setHost("localhost", 443, easyhttps);
     *     </blockquote>
     */
    public EasySSLProtocolSocketFactory() {
        super();
    }

    private static SSLContext createEasySSLContext() {
        try {
            SSLContext context = SSLContext.getInstance("SSL");
            context.init(
              null, 
              new TrustManager[] {new EasyX509TrustManager(null)}, 
              null);
            return context;
        } catch (Exception e) {
            LOG.error(e.getMessage(), e);
            throw new HttpClientError(e.toString());
        }
    }

    private static SSLSocketFactory getEasySSLSocketFactory() {
        if (SSL_CONTEXT_SINGLETON == null) {
            SSL_CONTEXT_SINGLETON = createEasySSLContext();
        }
        return SSL_CONTEXT_SINGLETON.getSocketFactory();
    }

    /**
     * @see SecureProtocolSocketFactory#createSocket(java.lang.String,int,java.net.InetAddress,int)
     */
    public Socket createSocket(
        String host,
        int port,
        InetAddress clientHost,
        int clientPort)
        throws IOException, UnknownHostException {

        Socket socket = getEasySSLSocketFactory().createSocket(
            host,
            port,
            clientHost,
            clientPort
        );
        return socket;
    }

    /**
     * Attempts to get a new socket connection to the given host within the given time limit.
     * <p>
     * This method employs several techniques to circumvent the limitations of older JREs that 
     * do not support connect timeout. When running in JRE 1.4 or above reflection is used to 
     * call Socket#connect(SocketAddress endpoint, int timeout) method. When executing in older 
     * JREs a controller thread is executed. The controller thread attempts to create a new socket
     * within the given limit of time. If socket constructor does not return until the timeout 
     * expires, the controller terminates and throws an {@link ConnectTimeoutException}
     * </p>
     *  
     * @param host the host name/IP
     * @param port the port on the host
     * @param clientHost the local host name/IP to bind the socket to
     * @param clientPort the port on the local machine
     * @param params {@link HttpConnectionParams Http connection parameters}
     * 
     * @return Socket a new socket
     * 
     * @throws IOException if an I/O error occurs while creating the socket
     * @throws UnknownHostException if the IP address of the host cannot be
     * determined
     */
    public Socket createSocket(
        final String host,
        final int port,
        final InetAddress localAddress,
        final int localPort,
        final HttpConnectionParams params
    ) throws IOException, UnknownHostException, ConnectTimeoutException {
        if (params == null) {
            throw new IllegalArgumentException("Parameters may not be null");
        }
        int timeout = params.getConnectionTimeout();
        if (timeout == 0) {
            return createSocket(host, port, localAddress, localPort);
        } else {
            // To be eventually deprecated when migrated to Java 1.4 or above
            Socket socket = ReflectionSocketFactory.createSocket(
                "javax.net.ssl.SSLSocketFactory", host, port, localAddress, localPort, timeout);
            if (socket == null) {
                socket = ControllerThreadSocketFactory.createSocket(
                    this, host, port, localAddress, localPort, timeout);
            }
            return socket;
        }
    }

    /**
     * @see SecureProtocolSocketFactory#createSocket(java.lang.String,int)
     */
    public Socket createSocket(String host, int port)
        throws IOException, UnknownHostException {
        return getEasySSLSocketFactory().createSocket(
            host,
            port
        );
    }

    /**
     * @see SecureProtocolSocketFactory#createSocket(java.net.Socket,java.lang.String,int,boolean)
     */
    public Socket createSocket(
        Socket socket,
        String host,
        int port,
        boolean autoClose)
        throws IOException, UnknownHostException {
        return getEasySSLSocketFactory().createSocket(
            socket,
            host,
            port,
            autoClose
        );
    }

    public boolean equals(Object obj) {
        return ((obj != null) && obj.getClass().equals(EasySSLProtocolSocketFactory.class));
    }

    public int hashCode() {
        return EasySSLProtocolSocketFactory.class.hashCode();
    }

}