org.eclipse.jetty.client.Socks5Proxy Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.client;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.charset.StandardCharsets;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeoutException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.jetty.client.ProxyConfiguration.Proxy;
import org.eclipse.jetty.client.Socks5.NoAuthenticationFactory;
import org.eclipse.jetty.io.AbstractConnection;
import org.eclipse.jetty.io.ClientConnectionFactory;
import org.eclipse.jetty.io.ClientConnector;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.Promise;
import org.eclipse.jetty.util.URIUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Client-side proxy configuration for SOCKS5, defined by
* RFC 1928.
* Multiple authentication methods are supported via
* {@link #putAuthenticationFactory(Socks5.Authentication.Factory)}.
* By default only the {@link Socks5.NoAuthenticationFactory NO AUTH}
* authentication method is configured.
* The {@link Socks5.UsernamePasswordAuthenticationFactory USERNAME/PASSWORD}
* is available to applications but must be explicitly configured and
* added.
*/
public class Socks5Proxy extends Proxy
{
private static final Logger LOG = LoggerFactory.getLogger(Socks5Proxy.class);
private final Map authentications = new LinkedHashMap<>();
/**
* Creates a new instance with the given SOCKS5 proxy host and port.
*
* @param host the SOCKS5 proxy host name
* @param port the SOCKS5 proxy port
*/
public Socks5Proxy(String host, int port)
{
this(new Origin.Address(host, port), false);
}
/**
* Creates a new instance with the given SOCKS5 proxy address.
* When {@code secure=true} the communication between the client and the
* proxy will be encrypted (using this proxy {@link #getSslContextFactory()}
* which typically defaults to that of {@link HttpClient}.
*
* @param address the SOCKS5 proxy address (host and port)
* @param secure whether the communication between the client and the SOCKS5 proxy should be secure
*/
public Socks5Proxy(Origin.Address address, boolean secure)
{
super(address, secure, null, null);
putAuthenticationFactory(new NoAuthenticationFactory());
}
/**
* Provides this class with the given SOCKS5 authentication method.
*
* @param authenticationFactory the SOCKS5 authentication factory
* @return the previous authentication method of the same type, or {@code null}
* if there was none of that type already present
*/
public Socks5.Authentication.Factory putAuthenticationFactory(Socks5.Authentication.Factory authenticationFactory)
{
return authentications.put(authenticationFactory.getMethod(), authenticationFactory);
}
/**
* Removes the authentication of the given {@code method}.
*
* @param method the authentication method to remove
*/
public Socks5.Authentication.Factory removeAuthenticationFactory(byte method)
{
return authentications.remove(method);
}
@Override
public ClientConnectionFactory newClientConnectionFactory(ClientConnectionFactory connectionFactory)
{
return new Socks5ProxyClientConnectionFactory(connectionFactory);
}
private class Socks5ProxyClientConnectionFactory implements ClientConnectionFactory
{
private final ClientConnectionFactory connectionFactory;
private Socks5ProxyClientConnectionFactory(ClientConnectionFactory connectionFactory)
{
this.connectionFactory = connectionFactory;
}
public org.eclipse.jetty.io.Connection newConnection(EndPoint endPoint, Map context)
{
Destination destination = (Destination)context.get(HttpClientTransport.HTTP_DESTINATION_CONTEXT_KEY);
Executor executor = destination.getHttpClient().getExecutor();
Socks5ProxyConnection connection = new Socks5ProxyConnection(endPoint, executor, connectionFactory, context, authentications);
return customize(connection, context);
}
}
private static class Socks5ProxyConnection extends AbstractConnection implements org.eclipse.jetty.io.Connection.UpgradeFrom
{
private static final Pattern IPv4_PATTERN = Pattern.compile("(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})");
// SOCKS5 response max length is 262 bytes.
private final ByteBuffer byteBuffer = BufferUtil.allocate(512);
private final ClientConnectionFactory connectionFactory;
private final Map context;
private final Map authentications;
private State state = State.HANDSHAKE;
private Socks5ProxyConnection(EndPoint endPoint, Executor executor, ClientConnectionFactory connectionFactory, Map context, Map authentications)
{
super(endPoint, executor);
this.connectionFactory = connectionFactory;
this.context = context;
this.authentications = Map.copyOf(authentications);
}
@Override
public ByteBuffer onUpgradeFrom()
{
return BufferUtil.copy(byteBuffer);
}
@Override
public void onOpen()
{
super.onOpen();
sendHandshake();
}
private void sendHandshake()
{
try
{
// +-------------+--------------------+------------------+
// | version (1) | num of methods (1) | methods (1..255) |
// +-------------+--------------------+------------------+
int size = authentications.size();
ByteBuffer byteBuffer = ByteBuffer.allocate(1 + 1 + size)
.put(Socks5.VERSION)
.put((byte)size);
authentications.keySet().forEach(byteBuffer::put);
byteBuffer.flip();
getEndPoint().write(Callback.from(this::handshakeSent, this::fail), byteBuffer);
}
catch (Throwable x)
{
fail(x);
}
}
private void handshakeSent()
{
if (LOG.isDebugEnabled())
LOG.debug("Written SOCKS5 handshake request");
state = State.HANDSHAKE;
fillInterested();
}
private void fail(Throwable x)
{
if (LOG.isDebugEnabled())
LOG.debug("SOCKS5 failure", x);
getEndPoint().close(x);
@SuppressWarnings("unchecked")
Promise promise = (Promise)this.context.get(HttpClientTransport.HTTP_CONNECTION_PROMISE_CONTEXT_KEY);
promise.failed(x);
}
@Override
public boolean onIdleExpired(TimeoutException timeout)
{
fail(timeout);
return false;
}
@Override
public void onFillable()
{
try
{
switch (state)
{
case HANDSHAKE -> receiveHandshake();
case CONNECT -> receiveConnect();
default -> throw new IllegalStateException();
}
}
catch (Throwable x)
{
fail(x);
}
}
private void receiveHandshake() throws IOException
{
// +-------------+------------+
// | version (1) | method (1) |
// +-------------+------------+
int filled = getEndPoint().fill(byteBuffer);
if (filled < 0)
throw new ClosedChannelException();
if (byteBuffer.remaining() < 2)
{
fillInterested();
return;
}
if (LOG.isDebugEnabled())
LOG.debug("Received SOCKS5 handshake response {}", BufferUtil.toDetailString(byteBuffer));
byte version = byteBuffer.get();
if (version != Socks5.VERSION)
throw new IOException("Unsupported SOCKS5 version: " + version);
byte method = byteBuffer.get();
if (method == -1)
throw new IOException("Unacceptable SOCKS5 authentication methods");
Socks5.Authentication.Factory factory = authentications.get(method);
if (factory == null)
throw new IOException("Unknown SOCKS5 authentication method: " + method);
factory.newAuthentication().authenticate(getEndPoint(), Callback.from(this::sendConnect, this::fail));
}
private void sendConnect()
{
try
{
// +-------------+-------------+--------------+------------------+------------------------+----------+
// | version (1) | command (1) | reserved (1) | address type (1) | address bytes (4..255) | port (2) |
// +-------------+-------------+--------------+------------------+------------------------+----------+
Destination destination = (Destination)context.get(HttpClientTransport.HTTP_DESTINATION_CONTEXT_KEY);
Origin.Address address = destination.getOrigin().getAddress();
String host = address.getHost();
short port = (short)address.getPort();
ByteBuffer byteBuffer;
Matcher matcher = IPv4_PATTERN.matcher(host);
if (matcher.matches())
{
byteBuffer = ByteBuffer.allocate(10)
.put(Socks5.VERSION)
.put(Socks5.COMMAND_CONNECT)
.put(Socks5.RESERVED)
.put(Socks5.ADDRESS_TYPE_IPV4);
for (int i = 1; i <= 4; ++i)
{
byteBuffer.put((byte)Integer.parseInt(matcher.group(i)));
}
byteBuffer.putShort(port)
.flip();
}
else if (URIUtil.isValidHostRegisteredName(host))
{
byte[] bytes = host.getBytes(StandardCharsets.US_ASCII);
if (bytes.length > 255)
throw new IOException("Invalid host name: " + host);
byteBuffer = ByteBuffer.allocate(7 + bytes.length)
.put(Socks5.VERSION)
.put(Socks5.COMMAND_CONNECT)
.put(Socks5.RESERVED)
.put(Socks5.ADDRESS_TYPE_DOMAIN)
.put((byte)bytes.length)
.put(bytes)
.putShort(port)
.flip();
}
else
{
// Assume IPv6.
byte[] bytes = InetAddress.getByName(host).getAddress();
byteBuffer = ByteBuffer.allocate(22)
.put(Socks5.VERSION)
.put(Socks5.COMMAND_CONNECT)
.put(Socks5.RESERVED)
.put(Socks5.ADDRESS_TYPE_IPV6)
.put(bytes)
.putShort(port)
.flip();
}
getEndPoint().write(Callback.from(this::connectSent, this::fail), byteBuffer);
}
catch (Throwable x)
{
fail(x);
}
}
private void connectSent()
{
if (LOG.isDebugEnabled())
LOG.debug("Written SOCKS5 connect request");
state = State.CONNECT;
fillInterested();
}
private void receiveConnect() throws IOException
{
// +-------------+-----------+--------------+------------------+------------------------+----------+
// | version (1) | reply (1) | reserved (1) | address type (1) | address bytes (4..255) | port (2) |
// +-------------+-----------+--------------+------------------+------------------------+----------+
int filled = getEndPoint().fill(byteBuffer);
if (filled < 0)
throw new ClosedChannelException();
if (byteBuffer.remaining() < 5)
{
fillInterested();
return;
}
byte addressType = byteBuffer.get(3);
int length = 6;
if (addressType == Socks5.ADDRESS_TYPE_IPV4)
length += 4;
else if (addressType == Socks5.ADDRESS_TYPE_DOMAIN)
length += 1 + (byteBuffer.get(4) & 0xFF);
else if (addressType == Socks5.ADDRESS_TYPE_IPV6)
length += 16;
else
throw new IOException("Invalid SOCKS5 address type: " + addressType);
if (byteBuffer.remaining() < length)
{
fillInterested();
return;
}
if (LOG.isDebugEnabled())
LOG.debug("Received SOCKS5 connect response {}", BufferUtil.toDetailString(byteBuffer));
// We have all the SOCKS5 bytes.
byte version = byteBuffer.get();
if (version != Socks5.VERSION)
throw new IOException("Unsupported SOCKS5 version: " + version);
byte status = byteBuffer.get();
switch (status)
{
case 0 ->
{
// Consume the buffer before upgrading to the tunnel.
byteBuffer.position(length);
tunnel();
}
case 1 -> throw new IOException("SOCKS5 general failure");
case 2 -> throw new IOException("SOCKS5 connection not allowed");
case 3 -> throw new IOException("SOCKS5 network unreachable");
case 4 -> throw new IOException("SOCKS5 host unreachable");
case 5 -> throw new IOException("SOCKS5 connection refused");
case 6 -> throw new IOException("SOCKS5 timeout expired");
case 7 -> throw new IOException("SOCKS5 unsupported command");
case 8 -> throw new IOException("SOCKS5 unsupported address");
default -> throw new IOException("SOCKS5 unknown status: " + status);
}
}
private void tunnel()
{
try
{
Destination destination = (Destination)context.get(HttpClientTransport.HTTP_DESTINATION_CONTEXT_KEY);
Origin.Address address = destination.getOrigin().getAddress();
// Don't want to do DNS resolution here.
InetSocketAddress inet = InetSocketAddress.createUnresolved(address.getHost(), address.getPort());
context.put(ClientConnector.REMOTE_SOCKET_ADDRESS_CONTEXT_KEY, inet);
ClientConnectionFactory connectionFactory = this.connectionFactory;
if (destination.isSecure())
connectionFactory = destination.getHttpClient().newSslClientConnectionFactory(null, connectionFactory);
var newConnection = connectionFactory.newConnection(getEndPoint(), context);
getEndPoint().upgrade(newConnection);
if (LOG.isDebugEnabled())
LOG.debug("SOCKS5 tunnel established: {} over {}", this, newConnection);
}
catch (Throwable x)
{
fail(x);
}
}
private enum State
{
HANDSHAKE, CONNECT
}
}
}
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