/*
* @(#)file SslRMIServerSocketFactory.java
* @(#)author Sun Microsystems, Inc.
* @(#)version 1.16
* @(#)date 04/06/01
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.rmi.ssl;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.rmi.server.RMIServerSocketFactory;
import java.util.Arrays;
import java.util.List;
import javax.net.ssl.SSLServerSocketFactory;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
/**
* <p>An <code>SslRMIServerSocketFactory</code> instance is used by the RMI
* runtime in order to obtain server sockets for RMI calls via SSL.</p>
*
* <p>This class implements <code>RMIServerSocketFactory</code> over
* the Secure Sockets Layer (SSL) or Transport Layer Security (TLS)
* protocols.</p>
*
* <p>This class creates SSL sockets using the default
* <code>SSLSocketFactory</code> (see {@link
* SSLSocketFactory#getDefault}) or the default
* <code>SSLServerSocketFactory</code> (see {@link
* SSLServerSocketFactory#getDefault}). Therefore, all instances of
* this class share the same keystore, and the same truststore, when
* client authentication is required by the server. This behavior
* can be modified in subclasses by overriding the {@link
* #createServerSocket(int)} method; in that case, {@link
* #equals(Object) equals} and {@link #hashCode() hashCode} may also
* need to be overridden.</p>
*
* @see javax.net.ssl.SSLSocketFactory
* @see javax.net.ssl.SSLServerSocketFactory
* @see javax.rmi.ssl.SslRMIClientSocketFactory
* @since 1.5
*/
public class SslRMIServerSocketFactory implements RMIServerSocketFactory {
/**
* <p>Creates a new <code>SslRMIServerSocketFactory</code> with
* the default SSL socket configuration.</p>
*
* <p>SSL connections accepted by server sockets created by this
* factory have the default cipher suites and protocol versions
* enabled and do not require client authentication.</p>
*/
public SslRMIServerSocketFactory() {
this(null, null, false);
}
/**
* <p>Creates a new <code>SslRMIServerSocketFactory</code> with
* the specified SSL socket configuration.</p>
*
* @param enabledCipherSuites names of all the cipher suites to
* enable on SSL connections accepted by server sockets created by
* this factory, or <code>null</code> to use the cipher suites
* that are enabled by default
*
* @param enabledProtocols names of all the protocol versions to
* enable on SSL connections accepted by server sockets created by
* this factory, or <code>null</code> to use the protocol versions
* that are enabled by default
*
* @param needClientAuth <code>true</code> to require client
* authentication on SSL connections accepted by server sockets
* created by this factory; <code>false</code> to not require
* client authentication
*
* @exception IllegalArgumentException when one or more of the cipher
* suites named by the <code>enabledCipherSuites</code> parameter is
* not supported, when one or more of the protocols named by the
* <code>enabledProtocols</code> parameter is not supported or when
* a problem is encountered while trying to check if the supplied
* cipher suites and protocols to be enabled are supported.
*
* @see SSLSocket#setEnabledCipherSuites
* @see SSLSocket#setEnabledProtocols
* @see SSLSocket#setNeedClientAuth
*/
public SslRMIServerSocketFactory(String[] enabledCipherSuites,
String[] enabledProtocols,
boolean needClientAuth)
throws IllegalArgumentException {
// Initialize the configuration parameters.
//
this.enabledCipherSuites = enabledCipherSuites == null ?
null : (String[]) enabledCipherSuites.clone();
this.enabledProtocols = enabledProtocols == null ?
null : (String[]) enabledProtocols.clone();
this.needClientAuth = needClientAuth;
// Force the initialization of the default at construction time,
// rather than delaying it to the first time createServerSocket()
// is called.
//
final SSLSocketFactory sslSocketFactory = getDefaultSSLSocketFactory();
SSLSocket sslSocket = null;
if (this.enabledCipherSuites != null || this.enabledProtocols != null) {
try {
sslSocket = (SSLSocket) sslSocketFactory.createSocket();
} catch (Exception e) {
final String msg = "Unable to check if the cipher suites " +
"and protocols to enable are supported";
throw (IllegalArgumentException)
new IllegalArgumentException(msg).initCause(e);
}
}
// Check if all the cipher suites and protocol versions to enable
// are supported by the underlying SSL/TLS implementation and if
// true create lists from arrays.
//
if (this.enabledCipherSuites != null) {
sslSocket.setEnabledCipherSuites(this.enabledCipherSuites);
enabledCipherSuitesList =
Arrays.asList((String[]) this.enabledCipherSuites);
}
if (this.enabledProtocols != null) {
sslSocket.setEnabledProtocols(this.enabledProtocols);
enabledProtocolsList =
Arrays.asList((String[]) this.enabledProtocols);
}
}
/**
* <p>Returns the names of the cipher suites enabled on SSL
* connections accepted by server sockets created by this factory,
* or <code>null</code> if this factory uses the cipher suites
* that are enabled by default.</p>
*
* @return an array of cipher suites enabled, or <code>null</code>
*
* @see SSLSocket#setEnabledCipherSuites
*/
public final String[] getEnabledCipherSuites() {
return enabledCipherSuites == null ?
null : (String[]) enabledCipherSuites.clone();
}
/**
* <p>Returns the names of the protocol versions enabled on SSL
* connections accepted by server sockets created by this factory,
* or <code>null</code> if this factory uses the protocol versions
* that are enabled by default.</p>
*
* @return an array of protocol versions enabled, or
* <code>null</code>
*
* @see SSLSocket#setEnabledProtocols
*/
public final String[] getEnabledProtocols() {
return enabledProtocols == null ?
null : (String[]) enabledProtocols.clone();
}
/**
* <p>Returns <code>true</code> if client authentication is
* required on SSL connections accepted by server sockets created
* by this factory.</p>
*
* @return <code>true</code> if client authentication is required
*
* @see SSLSocket#setNeedClientAuth
*/
public final boolean getNeedClientAuth() {
return needClientAuth;
}
/**
* <p>Creates a server socket that accepts SSL connections
* configured according to this factory's SSL socket configuration
* parameters.</p>
*/
public ServerSocket createServerSocket(int port) throws IOException {
final SSLSocketFactory sslSocketFactory = getDefaultSSLSocketFactory();
return new ServerSocket(port) {
public Socket accept() throws IOException {
Socket socket = super.accept();
SSLSocket sslSocket = (SSLSocket)
sslSocketFactory.createSocket(
socket, socket.getInetAddress().getHostName(),
socket.getPort(), true);
sslSocket.setUseClientMode(false);
if (enabledCipherSuites != null) {
sslSocket.setEnabledCipherSuites(enabledCipherSuites);
}
if (enabledProtocols != null) {
sslSocket.setEnabledProtocols(enabledProtocols);
}
sslSocket.setNeedClientAuth(needClientAuth);
return sslSocket;
}
};
// If we do not instantiate the server socket class, but
// instead must layer on top of an arbitrary server socket,
// then this implementation would become uglier, like this
// (given "serverSocket" to layer on top of):
//
// return new ForwardingServerSocket(serverSocket) {
// public Socket accept() throws IOException {
// Socket socket = serverSocket.accept();
// SSLSocket sslSocket =
// (SSLSocket) sslSocketFactory.createSocket(
// socket,
// socket.getInetAddress().getHostName(),
// socket.getPort(),
// true);
// sslSocket.setUseClientMode(false);
// if (enabledProtocols != null) {
// sslSocket.setEnabledProtocols(enabledProtocols);
// }
// if (enabledCipherSuites != null) {
// sslSocket.setEnabledCipherSuites(enabledCipherSuites);
// }
// sslSocket.setNeedClientAuth(needClientAuth);
// return sslSocket;
// }
// public ServerSocketChannel getChannel() {
// return null;
// }
// public String toString() {
// return serverSocket.toString();
// }
// };
}
/**
* <p>Indicates whether some other object is "equal to" this one.</p>
*
* <p>Two <code>SslRMIServerSocketFactory</code> objects are equal
* if they have been constructed with the same SSL socket
* configuration parameters.</p>
*
* <p>A subclass should override this method (as well as
* {@link #hashCode()}) if it adds instance state that affects
* equality.</p>
*/
public boolean equals(Object obj) {
if (obj == null) return false;
if (obj == this) return true;
if (!(obj instanceof SslRMIServerSocketFactory))
return false;
SslRMIServerSocketFactory that = (SslRMIServerSocketFactory) obj;
return (getClass().equals(that.getClass()) && checkParameters(that));
}
private boolean checkParameters(SslRMIServerSocketFactory that) {
// needClientAuth flag
//
if (needClientAuth != that.needClientAuth)
return false;
// enabledCipherSuites
//
if ((enabledCipherSuites == null && that.enabledCipherSuites != null) ||
(enabledCipherSuites != null && that.enabledCipherSuites == null))
return false;
if (enabledCipherSuites != null && that.enabledCipherSuites != null) {
List thatEnabledCipherSuitesList =
Arrays.asList((String[]) that.enabledCipherSuites);
if (!enabledCipherSuitesList.equals(thatEnabledCipherSuitesList))
return false;
}
// enabledProtocols
//
if ((enabledProtocols == null && that.enabledProtocols != null) ||
(enabledProtocols != null && that.enabledProtocols == null))
return false;
if (enabledProtocols != null && that.enabledProtocols != null) {
List thatEnabledProtocolsList =
Arrays.asList((String[]) that.enabledProtocols);
if (!enabledProtocolsList.equals(thatEnabledProtocolsList))
return false;
}
return true;
}
/**
* <p>Returns a hash code value for this
* <code>SslRMIServerSocketFactory</code>.</p>
*
* @return a hash code value for this
* <code>SslRMIServerSocketFactory</code>.
*/
public int hashCode() {
return getClass().hashCode() +
(needClientAuth ? Boolean.TRUE.hashCode() : Boolean.FALSE.hashCode()) +
(enabledCipherSuites == null ? 0 : enabledCipherSuitesList.hashCode()) +
(enabledProtocols == null ? 0 : enabledProtocolsList.hashCode());
}
// We use a static field because:
//
// SSLSocketFactory.getDefault() always returns the same object
// (at least on Sun's implementation), and we want to make sure that
// the Javadoc & the implementation stay in sync.
//
// If someone needs to have different SslRMIServerSocketFactory factories
// with different underlying SSLSocketFactory objects using different
// key and trust stores, he can always do so by subclassing this class and
// overriding createServerSocket(int port).
//
private static SSLSocketFactory defaultSSLSocketFactory = null;
private static synchronized SSLSocketFactory getDefaultSSLSocketFactory() {
if (defaultSSLSocketFactory == null)
defaultSSLSocketFactory =
(SSLSocketFactory) SSLSocketFactory.getDefault();
return defaultSSLSocketFactory;
}
private final String[] enabledCipherSuites;
private final String[] enabledProtocols;
private final boolean needClientAuth;
private List enabledCipherSuitesList;
private List enabledProtocolsList;
// private static class ForwardingServerSocket extends ServerSocket {
// private final ServerSocket ss;
// ForwardingServerSocket(ServerSocket ss) throws IOException {
// super();
// this.ss = ss;
// }
// public void bind(SocketAddress endpoint) throws IOException {
// ss.bind(endpoint);
// }
// public void bind(SocketAddress endpoint, int backlog)
// throws IOException
// {
// ss.bind(endpoint, backlog);
// }
// public InetAddress getInetAddress() {
// return ss.getInetAddress();
// }
// public int getLocalPort() {
// return ss.getLocalPort();
// }
// public SocketAddress getLocalSocketAddress() {
// return ss.getLocalSocketAddress();
// }
// public Socket accept() throws IOException {
// return ss.accept();
// }
// public void close() throws IOException {
// ss.close();
// }
// public ServerSocketChannel getChannel() {
// return ss.getChannel();
// }
// public boolean isBound() {
// return ss.isBound();
// }
// public boolean isClosed() {
// return ss.isClosed();
// }
// public void setSoTimeout(int timeout) throws SocketException {
// ss.setSoTimeout(timeout);
// }
// public int getSoTimeout() throws IOException {
// return ss.getSoTimeout();
// }
// public void setReuseAddress(boolean on) throws SocketException {
// ss.setReuseAddress(on);
// }
// public boolean getReuseAddress() throws SocketException {
// return ss.getReuseAddress();
// }
// public String toString() {
// return ss.toString();
// }
// public void setReceiveBufferSize(int size) throws SocketException {
// ss.setReceiveBufferSize(size);
// }
// public int getReceiveBufferSize() throws SocketException {
// return ss.getReceiveBufferSize();
// }
// }
}
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