Add the files

ProxyServer/AuthUserPass.cs

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+/*
+    Copyright © 2002, The KPD-Team
+    All rights reserved.
+    http://www.mentalis.org/
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+
+    - Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer. 
+
+    - Neither the name of the KPD-Team, nor the names of its contributors
+       may be used to endorse or promote products derived from this
+       software without specific prior written permission. 
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+  THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+  OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+using System;
+using System.Text;
+using System.Net;
+using System.Net.Sockets;
+using Org.Mentalis.Proxy;
+using Org.Mentalis.Proxy.Socks;
+using Org.Mentalis.Proxy.Socks.Authentication;
+
+namespace Org.Mentalis.Proxy.Socks.Authentication {
+
+///<summary>Authenticates a user on a SOCKS5 server according to the username/password authentication subprotocol.</summary>
+internal sealed class AuthUserPass : AuthBase {
+	///<summary>Initializes a new instance of the AuthUserPass class.</summary>
+	///<param name="AuthList">An AuthenticationList object that contains the list of all valid username/password combinations.</param>
+	///<remarks>If the AuthList parameter is null, any username/password combination will be accepted.</remarks>
+	public AuthUserPass(AuthenticationList AuthList) {
+		this.AuthList = AuthList;
+	}
+	///<summary>Starts the authentication process.</summary>
+	///<param name="Connection">The connection with the SOCKS client.</param>
+	///<param name="Callback">The method to call when the authentication is complete.</param>
+	internal override void StartAuthentication(Socket Connection, AuthenticationCompleteDelegate Callback) {
+		this.Connection = Connection;
+		this.Callback = Callback;
+		try {
+			Bytes = null;
+			Connection.BeginReceive(Buffer, 0, Buffer.Length, SocketFlags.None, new AsyncCallback(this.OnRecvRequest), Connection);
+		} catch {
+			Callback(false);
+		}
+	}
+	///<summary>Called when we have received the initial authentication data from the SOCKS client.</summary>
+	///<param name="ar">The result of the asynchronous operation.</param>
+	private void OnRecvRequest(IAsyncResult ar) {
+		try {
+			int Ret = Connection.EndReceive(ar);
+			if (Ret <= 0) {
+				Callback(false);
+				return;
+			}
+			AddBytes(Buffer, Ret);
+			if (IsValidQuery(Bytes))
+				ProcessQuery(Bytes);
+			else
+				Connection.BeginReceive(Buffer, 0, Buffer.Length, SocketFlags.None, new AsyncCallback(this.OnRecvRequest), Connection);
+		} catch {
+			Callback(false);
+		}
+	}
+	///<summary>Checks whether the specified authentication query is a valid one.</summary>
+	///<param name="Query">The query to check.</param>
+	///<returns>True if the query is a valid authentication query, false otherwise.</returns>
+	private bool IsValidQuery(byte [] Query) {
+		try {
+			return (Query.Length == Query[1] + Query[Query[1] + 2] + 3);
+		} catch {
+			return false;
+		}
+	}
+	///<summary>Processes an authentication query.</summary>
+	///<param name="Query">The query to process.</param>
+	private void ProcessQuery(byte [] Query) {
+		try {
+			string User = Encoding.ASCII.GetString(Query, 2, Query[1]);
+			string Pass = Encoding.ASCII.GetString(Query, Query[1] + 3, Query[Query[1] + 2]);
+			byte [] ToSend;
+			if (AuthList == null || AuthList.IsItemPresent(User, Pass)) {
+				ToSend = new byte[]{5, 0};
+				Connection.BeginSend(ToSend, 0, ToSend.Length, SocketFlags.None, new AsyncCallback(this.OnOkSent), Connection);
+			} else {
+				ToSend = new Byte[]{5, 1};
+				Connection.BeginSend(ToSend, 0, ToSend.Length, SocketFlags.None, new AsyncCallback(this.OnUhohSent), Connection);
+			}
+		} catch {
+			Callback(false);
+		}
+	}
+	///<summary>Called when an OK reply has been sent to the client.</summary>
+	///<param name="ar">The result of the asynchronous operation.</param>
+	private void OnOkSent(IAsyncResult ar) {
+		try {
+			if (Connection.EndSend(ar) <= 0)
+				Callback(false);
+			else
+				Callback(true);
+		} catch {
+			Callback(false);
+		}
+	}
+	///<summary>Called when a negatiev reply has been sent to the client.</summary>
+	///<param name="ar">The result of the asynchronous operation.</param>
+	private void OnUhohSent(IAsyncResult ar) {
+		try {
+			Connection.EndSend(ar);
+		} catch {}
+		Callback(false);
+	}
+	///<summary>Gets or sets the AuthenticationList to use when a computer tries to authenticate on the proxy server.</summary>
+	///<value>An instance of the AuthenticationList class that contains all the valid username/password combinations.</value>
+	private AuthenticationList AuthList {
+		get {
+			return m_AuthList;
+		}
+		set {
+			m_AuthList = value;
+		}
+	}
+	// private variables
+	/// <summary>Holds the value of the AuthList property.</summary>
+	private AuthenticationList m_AuthList;
+}
+
+}