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Trevor Hall 2026-03-03 23:53:04 -05:00
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Proxies/SOCKS5ProxyProtocol.cs Normal file
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/*
* Secucore
*
* Copyright (C) 2023 Trevor Hall
* All rights reserved.
*
* This software may be modified and distributed under the terms
* of the MIT license.
*
*/
using System.Collections.Generic;
using System.Net;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System;
namespace SecuCore.Proxies
{
public class SOCKS5ProxyProtocol : IProxyProtocol
{
public static readonly byte[] Socks5greeting = { 0x5, 0x2, 0x0, 0x2 };
public static async Task<bool> ConnectAsync(Sockets.TCPNetworkStream tcpns, string remoteHost, int remotePort, string proxyUsername, string proxyPassword)
{
byte[] socksReadBuf = new byte[64];
await tcpns.WriteAsync(Socks5greeting, 0, Socks5greeting.Length).ConfigureAwait(false);
if (await tcpns.ReadAsync(socksReadBuf, 0, 2).ConfigureAwait(false) < 2) return false;
int vers = socksReadBuf[0];
int authmethod = socksReadBuf[1];
if (vers != 5 || authmethod != 0) return false;
byte[] conp = Socks5ConnectPacket(remoteHost, remotePort);
await tcpns.WriteAsync(conp, 0, conp.Length).ConfigureAwait(false);
int len = await tcpns.ReadAsync(socksReadBuf, 0, socksReadBuf.Length).ConfigureAwait(false);
if (len <= 0) return false;
vers = (int)socksReadBuf[0];
if (vers == 0x05)
{
Socks5ConnectResult status = (Socks5ConnectResult)socksReadBuf[1];
if (status == Socks5ConnectResult.Succcess)
{
int boundType = socksReadBuf[3];
int totalResponseSize = 4;
if (boundType == 1)
{
totalResponseSize += 4;
}
else if (boundType == 3)
{
int strl = socksReadBuf[4];
totalResponseSize += strl + 1;
}
else if (boundType == 4)
{
totalResponseSize += 16;
}
totalResponseSize += 2;
int remainingSize = totalResponseSize - len;
if (remainingSize > 0)
{
byte[] remainb = new byte[remainingSize];
len = await tcpns.ReadAsync(remainb, 0, remainb.Length).ConfigureAwait(false);
if (len <= 0) return false;
}
return true;
}
else
{
return false;
}
}
else
{
return false;
}
}
public enum Socks5ConnectResult
{
Succcess,
Failure,
NotAllowedByRuleSet,
NetworkUnreachable,
HostUnreachable,
ConnectionRefused,
TTLExpired,
NotSupportedProtocol
}
public static byte[] Socks5ConnectPacket(string host, int port)
{
int hostType;
if (Regex.IsMatch(host, @"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}"))
hostType = 1; // ipv4 address
else if (Regex.IsMatch(host, @"(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))"))
hostType = 4; // ipv6 address
else
hostType = 3; // domain name
List<byte> connectionPacket = new();
{
var withBlock = connectionPacket;
// Write packet feader
withBlock.Add(5); // socks version 5
withBlock.Add(1); // TCP Stream Connection
withBlock.Add(0); // RFC Reserved 0
// Write address
withBlock.Add((byte)hostType); // Address Type
switch (hostType)
{
case 1 // ipv4
:
{
IPAddress dest = IPAddress.Parse(host);
withBlock.AddRange(dest.GetAddressBytes());
break;
}
case 4 // ipv6
:
{
IPAddress dest = IPAddress.Parse(host);
withBlock.AddRange(dest.GetAddressBytes());
break;
}
case 3 // domain
:
{
withBlock.Add((byte)host.Length);
withBlock.AddRange(System.Text.Encoding.UTF8.GetBytes(host));
break;
}
}
// Write port
withBlock.AddRange(PortToBytes(port));
}
return connectionPacket.ToArray();
}
private static byte[] PortToBytes(int port)
{
ushort ps = (ushort)port;
byte[] pb = BitConverter.GetBytes(ps);
// network order bytes
byte[] nb = new byte[2];
if (BitConverter.IsLittleEndian)
{
nb[0] = pb[1];
nb[1] = pb[0];
}
else
{
nb[0] = pb[0];
nb[1] = pb[1];
}
return nb;
}
}
}