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iPedroLB
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277
ProxyServer/Socks5Handler.cs
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277
ProxyServer/Socks5Handler.cs
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/*
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Copyright ?2002, The KPD-Team
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All rights reserved.
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http://www.mentalis.org/
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Neither the name of the KPD-Team, nor the names of its contributors
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may be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using Org.Mentalis.Proxy;
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using Org.Mentalis.Proxy.Socks.Authentication;
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namespace Org.Mentalis.Proxy.Socks {
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///<summary>Implements the SOCKS5 protocol.</summary>
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internal sealed class Socks5Handler : SocksHandler {
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///<summary>Initializes a new instance of the Socks5Handler class.</summary>
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///<param name="ClientConnection">The connection with the client.</param>
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///<param name="Callback">The method to call when the SOCKS negotiation is complete.</param>
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///<param name="AuthList">The authentication list to use when clients connect.</param>
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///<exception cref="ArgumentNullException"><c>Callback</c> is null.</exception>
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///<remarks>If the AuthList parameter is null, no authentication will be required when a client connects to the proxy server.</remarks>
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public Socks5Handler(Socket ClientConnection, NegotiationCompleteDelegate Callback, AuthenticationList AuthList) : base(ClientConnection, Callback) {
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this.AuthList = AuthList;
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}
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///<summary>Initializes a new instance of the Socks5Handler class.</summary>
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///<param name="ClientConnection">The connection with the client.</param>
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///<param name="Callback">The method to call when the SOCKS negotiation is complete.</param>
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///<exception cref="ArgumentNullException"><c>Callback</c> is null.</exception>
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public Socks5Handler(Socket ClientConnection, NegotiationCompleteDelegate Callback) : this(ClientConnection, Callback, null) {}
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///<summary>Checks whether a specific request is a valid SOCKS request or not.</summary>
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///<param name="Request">The request array to check.</param>
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///<returns>True is the specified request is valid, false otherwise</returns>
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protected override bool IsValidRequest(byte [] Request) {
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try {
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return (Request.Length == Request[0] + 1);
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} catch {
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return false;
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}
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}
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///<summary>Processes a SOCKS request from a client and selects an authentication method.</summary>
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///<param name="Request">The request to process.</param>
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protected override void ProcessRequest(byte [] Request) {
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try {
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byte Ret = 255;
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for (int Cnt = 1; Cnt < Request.Length; Cnt++) {
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if (Request[Cnt] == 0 && AuthList == null) { //0 = No authentication
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Ret = 0;
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AuthMethod = new AuthNone();
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break;
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} else if (Request[Cnt] == 2 && AuthList != null) { //2 = user/pass
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Ret = 2;
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AuthMethod = new AuthUserPass(AuthList);
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if (AuthList != null)
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break;
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}
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}
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Connection.BeginSend(new byte[]{5, Ret}, 0, 2, SocketFlags.None, new AsyncCallback(this.OnAuthSent), Connection);
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} catch {
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Dispose(false);
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}
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}
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///<summary>Called when client has been notified of the selected authentication method.</summary>
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///<param name="ar">The result of the asynchronous operation.</param>
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private void OnAuthSent(IAsyncResult ar) {
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try {
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if (Connection.EndSend(ar) <= 0 || AuthMethod == null) {
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Dispose(false);
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return;
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}
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AuthMethod.StartAuthentication(Connection, new AuthenticationCompleteDelegate(this.OnAuthenticationComplete));
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} catch {
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Dispose(false);
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}
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}
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///<summary>Called when the authentication is complete.</summary>
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///<param name="Success">Indicates whether the authentication was successful ot not.</param>
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private void OnAuthenticationComplete(bool Success) {
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try {
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if (Success) {
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Bytes = null;
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Connection.BeginReceive(Buffer, 0, Buffer.Length, SocketFlags.None, new AsyncCallback(this.OnRecvRequest), Connection);
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} else {
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Dispose(false);
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}
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} catch {
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Dispose(false);
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}
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}
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///<summary>Called when we received the request of the client.</summary>
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///<param name="ar">The result of the asynchronous operation.</param>
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private void OnRecvRequest(IAsyncResult ar) {
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try {
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int Ret = Connection.EndReceive(ar);
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if (Ret <= 0) {
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Dispose(false);
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return;
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}
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AddBytes(Buffer, Ret);
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if (IsValidQuery(Bytes))
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ProcessQuery(Bytes);
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else
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Connection.BeginReceive(Buffer, 0, Buffer.Length, SocketFlags.None, new AsyncCallback(this.OnRecvRequest), Connection);
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} catch {
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Dispose(false);
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}
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}
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///<summary>Checks whether a specified query is a valid query or not.</summary>
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///<param name="Query">The query to check.</param>
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///<returns>True if the query is valid, false otherwise.</returns>
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private bool IsValidQuery(byte [] Query) {
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try {
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switch(Query[3]) {
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case 1: //IPv4 address
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return (Query.Length == 10);
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case 3: //Domain name
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return (Query.Length == Query[4] + 7);
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case 4: //IPv6 address
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//Not supported
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Dispose(8);
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return false;
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default:
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Dispose(false);
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return false;
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}
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} catch {
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return false;
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}
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}
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///<summary>Processes a received query.</summary>
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///<param name="Query">The query to process.</param>
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private void ProcessQuery(byte [] Query) {
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try {
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switch(Query[1]) {
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case 1: //CONNECT
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IPAddress RemoteIP = null;
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int RemotePort = 0;
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if (Query[3] == 1) {
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RemoteIP = IPAddress.Parse(Query[4].ToString() + "." + Query[5].ToString() + "." + Query[6].ToString() + "." + Query[7].ToString());
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RemotePort = Query[8] * 256 + Query[9];
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} else if( Query[3] == 3) {
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RemoteIP = Dns.GetHostEntry(Encoding.ASCII.GetString(Query, 5, Query[4])).AddressList[0];
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RemotePort = Query[4] + 5;
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RemotePort = Query[RemotePort] * 256 + Query[RemotePort + 1];
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}
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RemoteConnection = new Socket(RemoteIP.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
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RemoteConnection.BeginConnect(new IPEndPoint(RemoteIP, RemotePort), new AsyncCallback(this.OnConnected), RemoteConnection);
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break;
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case 2: //BIND
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byte[] Reply = new byte[10];
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byte[] LocalIP = Listener.GetLocalExternalIP().GetAddressBytes();
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AcceptSocket = new Socket(IPAddress.Any.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
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AcceptSocket.Bind(new IPEndPoint(IPAddress.Any, 0));
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AcceptSocket.Listen(50);
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Reply[0] = 5; //Version 5
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Reply[1] = 0; //Everything is ok :)
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Reply[2] = 0; //Reserved
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Reply[3] = 1; //We're going to send a IPv4 address
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Reply[4] = LocalIP[0];// (byte)(Math.Floor((double)(LocalIP % 256))); //IP Address/1
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Reply[5] = LocalIP[1];//(byte)(Math.Floor((double)(LocalIP % 65536) / 256)); //IP Address/2
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Reply[6] = LocalIP[2];//(byte)(Math.Floor((double)(LocalIP % 16777216) / 65536)); //IP Address/3
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Reply[7] = LocalIP[3];//(byte)(Math.Floor((double)(LocalIP / 16777216))); //IP Address/4
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Reply[8] = (byte)(Math.Floor((double)((IPEndPoint)AcceptSocket.LocalEndPoint).Port / 256)); //Port/1
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Reply[9] = (byte)(((IPEndPoint)AcceptSocket.LocalEndPoint).Port % 256); //Port/2
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Connection.BeginSend(Reply, 0, Reply.Length, SocketFlags.None, new AsyncCallback(this.OnStartAccept), Connection);
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break;
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case 3: //ASSOCIATE
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//ASSOCIATE is not implemented (yet?)
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Dispose(7);
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break;
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default:
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Dispose(7);
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break;
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}
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} catch {
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Dispose(1);
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}
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}
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///<summary>Called when we're successfully connected to the remote host.</summary>
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///<param name="ar">The result of the asynchronous operation.</param>
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private void OnConnected(IAsyncResult ar) {
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try {
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RemoteConnection.EndConnect(ar);
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Dispose(0);
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} catch {
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Dispose(1);
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}
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}
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///<summary>Called when there's an incoming connection in the AcceptSocket queue.</summary>
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///<param name="ar">The result of the asynchronous operation.</param>
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protected override void OnAccept(IAsyncResult ar) {
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try {
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RemoteConnection = AcceptSocket.EndAccept(ar);
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AcceptSocket.Close();
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AcceptSocket = null;
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Dispose(0);
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} catch {
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Dispose(1);
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}
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}
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///<summary>Sends a reply to the client connection and disposes it afterwards.</summary>
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///<param name="Value">A byte that contains the reply code to send to the client.</param>
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protected override void Dispose(byte Value) {
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byte [] ToSend;
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try {
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ToSend = new byte[]{5, Value, 0, 1,
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((IPEndPoint)RemoteConnection.LocalEndPoint).Address.GetAddressBytes()[0],
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((IPEndPoint)RemoteConnection.LocalEndPoint).Address.GetAddressBytes()[1],
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((IPEndPoint)RemoteConnection.LocalEndPoint).Address.GetAddressBytes()[2],
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((IPEndPoint)RemoteConnection.LocalEndPoint).Address.GetAddressBytes()[3],
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(byte)(Math.Floor((double)((IPEndPoint)RemoteConnection.LocalEndPoint).Port / 256)),
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(byte)(((IPEndPoint)RemoteConnection.LocalEndPoint).Port % 256)};
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} catch {
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ToSend = new byte[] {5, 1, 0, 1, 0, 0, 0, 0, 0, 0};
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}
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try {
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Connection.BeginSend(ToSend, 0, ToSend.Length, SocketFlags.None, (AsyncCallback)(ToSend[1] == 0 ? new AsyncCallback(this.OnDisposeGood) : new AsyncCallback(this.OnDisposeBad)), Connection);
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} catch {
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Dispose(false);
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}
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}
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///<summary>Gets or sets the the AuthBase object to use when trying to authenticate the SOCKS client.</summary>
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///<value>The AuthBase object to use when trying to authenticate the SOCKS client.</value>
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///<exception cref="ArgumentNullException">The specified value is null.</exception>
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private AuthBase AuthMethod {
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get {
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return m_AuthMethod;
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}
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set {
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if (value == null)
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throw new ArgumentNullException();
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m_AuthMethod = value;
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}
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}
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///<summary>Gets or sets the AuthenticationList object to use when trying to authenticate the SOCKS client.</summary>
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///<value>The AuthenticationList object to use when trying to authenticate the SOCKS client.</value>
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private AuthenticationList AuthList {
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get {
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return m_AuthList;
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}
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set {
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m_AuthList = value;
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}
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}
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// private variables
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/// <summary>Holds the value of the AuthList property.</summary>
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private AuthenticationList m_AuthList;
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/// <summary>Holds the value of the AuthMethod property.</summary>
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private AuthBase m_AuthMethod;
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}
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}
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