/**
* Copyright (c) Codice Foundation
* <p>
* This is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser
* General Public License as published by the Free Software Foundation, either version 3 of the
* License, or any later version.
* <p>
* This program 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
* Lesser General Public License for more details. A copy of the GNU Lesser General Public License
* is distributed along with this program and can be found at
* <http://www.gnu.org/licenses/lgpl.html>.
*/
/*
* $HeadURL$ $Revision$ $Date$
*
* ====================================================================
*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You 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 g0verning 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/>.
*/
package org.apache.commons.httpclient.contrib.ssl;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.URL;
import java.net.UnknownHostException;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.UnrecoverableKeyException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Enumeration;
import javax.net.SocketFactory;
import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
import org.apache.commons.httpclient.ConnectTimeoutException;
import org.apache.commons.httpclient.params.HttpConnectionParams;
import org.apache.commons.httpclient.protocol.SecureProtocolSocketFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* <p>
* AuthSSLProtocolSocketFactory can be used to validate the identity of the HTTPS server against a
* list of trusted certificates and to authenticate to the HTTPS server using a private key.
* </p>
*
* <p>
* AuthSSLProtocolSocketFactory will enable server authentication when supplied with a
* {@link KeyStore truststore} file containg one or several trusted certificates. The client secure
* socket will reject the connection during the SSL session handshake if the target HTTPS server
* attempts to authenticate itself with a non-trusted certificate.
* </p>
*
* <p>
* Use JDK keytool utility to import a trusted certificate and generate a truststore file:
*
* <pre>
* keytool -import -alias "my server cert" -file server.crt -keystore my.truststore
* </pre>
*
* </p>
*
* <p>
* AuthSSLProtocolSocketFactory will enable client authentication when supplied with a
* {@link KeyStore keystore} file containg a private key/public certificate pair. The client secure
* socket will use the private key to authenticate itself to the target HTTPS server during the SSL
* session handshake if requested to do so by the server. The target HTTPS server will in its turn
* verify the certificate presented by the client in order to establish client's authenticity
* </p>
*
* <p>
* Use the following sequence of actions to generate a keystore file
* </p>
* <ul>
* <li>
* <p>
* Use JDK keytool utility to generate a new key
*
* <pre>
* keytool -genkey -v -alias "my client key" -validity 365 -keystore my.keystore
* </pre>
*
* For simplicity use the same password for the key as that of the keystore
* </p>
* </li>
* <li>
* <p>
* Issue a certificate signing request (CSR)
*
* <pre>
* keytool -certreq -alias "my client key" -file mycertreq.csr -keystore my.keystore
* </pre>
*
* </p>
* </li>
* <li>
* <p>
* Send the certificate request to the trusted Certificate Authority for signature. One may choose
* to act as her own CA and sign the certificate request using a PKI tool, such as OpenSSL.
* </p>
* </li>
* <li>
* <p>
* Import the trusted CA root certificate
*
* <pre>
* keytool -import -alias "my trusted ca" -file caroot.crt -keystore my.keystore
* </pre>
*
* </p>
* </li>
* <li>
* <p>
* Import the PKCS#7 file containg the complete certificate chain
*
* <pre>
* keytool -import -alias "my client key" -file mycert.p7 -keystore my.keystore
* </pre>
*
* </p>
* </li>
* <li>
* <p>
* Verify the content the resultant keystore file
*
* <pre>
* keytool -list -v -keystore my.keystore
* </pre>
*
* </p>
* </li>
* </ul>
* <p>
* Example of using custom protocol socket factory for a specific host:
*
* <pre>
* Protocol authhttps = new Protocol("https", new AuthSSLProtocolSocketFactory(new URL(
* "file:my.keystore"), "mypassword", new URL("file:my.truststore"), "mypassword"), 443);
*
* HttpClient client = new HttpClient();
* client.getHostConfiguration().setHost("localhost", 443, authhttps);
* // use relative url only
* GetMethod httpget = new GetMethod("/");
* client.executeMethod(httpget);
* </pre>
*
* </p>
* <p>
* Example of using custom protocol socket factory per default instead of the standard one:
*
* <pre>
* Protocol authhttps = new Protocol("https", new AuthSSLProtocolSocketFactory(new URL(
* "file:my.keystore"), "mypassword", new URL("file:my.truststore"), "mypassword"), 443);
* Protocol.registerProtocol("https", authhttps);
*
* HttpClient client = new HttpClient();
* GetMethod httpget = new GetMethod("https://localhost/");
* client.executeMethod(httpget);
* </pre>
*
* </p>
*
* @author <a href="mailto:oleg -at- ural.ru">Oleg Kalnichevski</a>
*
* <p>
* DISCLAIMER: HttpClient developers DO NOT actively support this component. The component
* is provided as a reference material, which may be inappropriate for use without
* additional customization.
* </p>
*/
public class AuthSSLProtocolSocketFactory implements SecureProtocolSocketFactory {
/** Log object for this class. */
private static final Log LOG = LogFactory.getLog(AuthSSLProtocolSocketFactory.class);
private URL keystoreUrl = null;
private String keystorePassword = null;
private URL truststoreUrl = null;
private String truststorePassword = null;
private SSLContext sslcontext = null;
/**
* Constructor for AuthSSLProtocolSocketFactory. Either a keystore or truststore file must be
* given. Otherwise SSL context initialization error will result.
*
* @param keystoreUrl
* URL of the keystore file. May be <tt>null</tt> if HTTPS client authentication is
* not to be used.
* @param keystorePassword
* Password to unlock the keystore. IMPORTANT: this implementation assumes that the
* same password is used to protect the key and the keystore itself.
* @param truststoreUrl
* URL of the truststore file. May be <tt>null</tt> if HTTPS server authentication is
* not to be used.
* @param truststorePassword
* Password to unlock the truststore.
*/
public AuthSSLProtocolSocketFactory(final URL keystoreUrl, final String keystorePassword,
final URL truststoreUrl, final String truststorePassword) {
super();
this.keystoreUrl = keystoreUrl;
this.keystorePassword = keystorePassword;
this.truststoreUrl = truststoreUrl;
this.truststorePassword = truststorePassword;
}
private static KeyStore createKeyStore(final URL url, final String password)
throws KeyStoreException, NoSuchAlgorithmException, CertificateException, IOException {
if (url == null) {
throw new IllegalArgumentException("Keystore url may not be null");
}
LOG.debug("Initializing key store");
KeyStore keystore = KeyStore.getInstance("jks");
InputStream is = null;
try {
is = url.openStream();
keystore.load(is, password != null ? password.toCharArray() : null);
} finally {
if (is != null) {
is.close();
}
}
return keystore;
}
private static KeyManager[] createKeyManagers(final KeyStore keystore, final String password)
throws KeyStoreException, NoSuchAlgorithmException, UnrecoverableKeyException {
if (keystore == null) {
throw new IllegalArgumentException("Keystore may not be null");
}
LOG.debug("Initializing key manager");
KeyManagerFactory kmfactory =
KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
kmfactory.init(keystore, password != null ? password.toCharArray() : null);
return kmfactory.getKeyManagers();
}
private static TrustManager[] createTrustManagers(final KeyStore keystore)
throws KeyStoreException, NoSuchAlgorithmException {
if (keystore == null) {
throw new IllegalArgumentException("Keystore may not be null");
}
LOG.debug("Initializing trust manager");
TrustManagerFactory tmfactory =
TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
tmfactory.init(keystore);
TrustManager[] trustmanagers = tmfactory.getTrustManagers();
for (int i = 0; i < trustmanagers.length; i++) {
if (trustmanagers[i] instanceof X509TrustManager) {
trustmanagers[i] = new AuthSSLX509TrustManager((X509TrustManager) trustmanagers[i]);
}
}
return trustmanagers;
}
private SSLContext createSSLContext() {
try {
KeyManager[] keymanagers = null;
TrustManager[] trustmanagers = null;
if (this.keystoreUrl != null) {
KeyStore keystore = createKeyStore(this.keystoreUrl, this.keystorePassword);
if (LOG.isDebugEnabled()) {
Enumeration aliases = keystore.aliases();
while (aliases.hasMoreElements()) {
String alias = (String) aliases.nextElement();
Certificate[] certs = keystore.getCertificateChain(alias);
if (certs != null) {
LOG.debug("Certificate chain '" + alias + "':");
for (int c = 0; c < certs.length; c++) {
if (certs[c] instanceof X509Certificate) {
X509Certificate cert = (X509Certificate) certs[c];
LOG.debug(" Certificate " + (c + 1) + ":");
LOG.debug(" Subject DN: " + cert.getSubjectDN());
LOG.debug(" Signature Algorithm: " + cert.getSigAlgName());
LOG.debug(" Valid from: " + cert.getNotBefore());
LOG.debug(" Valid until: " + cert.getNotAfter());
LOG.debug(" Issuer: " + cert.getIssuerDN());
}
}
}
}
}
keymanagers = createKeyManagers(keystore, this.keystorePassword);
}
if (this.truststoreUrl != null) {
KeyStore keystore = createKeyStore(this.truststoreUrl, this.truststorePassword);
if (LOG.isDebugEnabled()) {
Enumeration aliases = keystore.aliases();
while (aliases.hasMoreElements()) {
String alias = (String) aliases.nextElement();
LOG.debug("Trusted certificate '" + alias + "':");
Certificate trustedcert = keystore.getCertificate(alias);
if (trustedcert != null && trustedcert instanceof X509Certificate) {
X509Certificate cert = (X509Certificate) trustedcert;
LOG.debug(" Subject DN: " + cert.getSubjectDN());
LOG.debug(" Signature Algorithm: " + cert.getSigAlgName());
LOG.debug(" Valid from: " + cert.getNotBefore());
LOG.debug(" Valid until: " + cert.getNotAfter());
LOG.debug(" Issuer: " + cert.getIssuerDN());
}
}
}
trustmanagers = createTrustManagers(keystore);
}
SSLContext sslcontext = SSLContext.getInstance("SSL");
sslcontext.init(keymanagers, trustmanagers, null);
return sslcontext;
} catch (NoSuchAlgorithmException e) {
LOG.debug(e.getMessage(), e);
throw new AuthSSLInitializationError(
"Unsupported algorithm exception: " + e.getMessage());
} catch (KeyStoreException e) {
LOG.debug(e.getMessage(), e);
throw new AuthSSLInitializationError("Keystore exception: " + e.getMessage());
} catch (GeneralSecurityException e) {
LOG.debug(e.getMessage(), e);
throw new AuthSSLInitializationError("Key management exception: " + e.getMessage());
} catch (IOException e) {
LOG.debug(e.getMessage(), e);
throw new AuthSSLInitializationError(
"I/O error reading keystore/truststore file: " + e.getMessage());
}
}
private SSLContext getSSLContext() {
if (this.sslcontext == null) {
this.sslcontext = createSSLContext();
}
return this.sslcontext;
}
/**
* Attempts to get a new socket connection to the given host within the given time limit.
* <p>
* To circumvent the limitations of older JREs that do not support connect timeout 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();
SocketFactory socketfactory = getSSLContext().getSocketFactory();
if (timeout == 0) {
return socketfactory.createSocket(host, port, localAddress, localPort);
} else {
Socket socket = socketfactory.createSocket();
SocketAddress localaddr = new InetSocketAddress(localAddress, localPort);
SocketAddress remoteaddr = new InetSocketAddress(host, port);
socket.bind(localaddr);
socket.connect(remoteaddr, timeout);
return socket;
}
}
/**
* @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 {
return getSSLContext().getSocketFactory()
.createSocket(host, port, clientHost, clientPort);
}
/**
* @see SecureProtocolSocketFactory#createSocket(java.lang.String, int)
*/
public Socket createSocket(String host, int port) throws IOException, UnknownHostException {
return getSSLContext().getSocketFactory()
.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 getSSLContext().getSocketFactory()
.createSocket(socket, host, port, autoClose);
}
}