52 lines
2 KiB
C#
52 lines
2 KiB
C#
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/*
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* Secucore
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*
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* Copyright (C) 2023 Trevor Hall
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* All rights reserved.
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*
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* This software may be modified and distributed under the terms
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* of the MIT license.
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*
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*/
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using System;
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using System.Text;
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using System.Threading.Tasks;
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namespace SecuCore.Proxies
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{
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public class HTTPProxyProtocol : IProxyProtocol
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{
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private const string httpConnectHostPort = "CONNECT {0}:{1} HTTP/1.1\r\n\r\n";
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private const string httpConnectHostPortAuth = "CONNECT {0}:{1} HTTP/1.1\r\nProxy-Authorization: Basic {2}\r\n\r\n";
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private static string CreateHTTPConnectHeaders(string destHost, int destport, string proxyUsername, string proxyPassword)
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{
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if (!string.IsNullOrEmpty(proxyUsername) && !string.IsNullOrEmpty(proxyPassword))
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{
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//auth
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string b64 = Convert.ToBase64String(Encoding.ASCII.GetBytes(proxyUsername + ":" + proxyPassword));
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return string.Format(httpConnectHostPortAuth, destHost, destport, b64);
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}
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else
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{
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return string.Format(httpConnectHostPort, destHost, destport);
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}
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}
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public static async Task<bool> ConnectAsync(Sockets.TCPNetworkStream tcpns, string remoteHost, int remotePort, string proxyUsername, string proxyPassword, string extra)
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{
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string http_connect_headers = CreateHTTPConnectHeaders(remoteHost, remotePort, proxyUsername, proxyPassword);
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byte[] header_data = Encoding.ASCII.GetBytes(http_connect_headers);
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await tcpns.WriteAsync(header_data, 0, header_data.Length).ConfigureAwait(false);
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byte[] received = await tcpns.ReadUntilCRLFCRLF().ConfigureAwait(false);
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if (received == null) return false;
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int rlen = received.Length;
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if (rlen <= 9) return false;
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string result = Encoding.ASCII.GetString(received, 0, rlen);
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string code = result.Substring(9, 3);
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if (code != "200") return false;
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return true;
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}
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}
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}
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