mirror of
https://github.com/Ylianst/MeshCentralRouter
synced 2025-12-06 00:13:33 +00:00
525 lines
21 KiB
C#
525 lines
21 KiB
C#
/*
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Copyright 2009-2020 Intel Corporation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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using System;
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using System.IO;
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using System.Text;
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using System.Net.Sockets;
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using System.Net.Security;
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using System.Collections.Generic;
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using System.Security.Cryptography;
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using System.Security.Cryptography.X509Certificates;
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using Microsoft.Win32;
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namespace MeshCentralRouter
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{
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public class webSocketClient : IDisposable
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{
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private TcpClient wsclient = null;
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private SslStream wsstream = null;
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private NetworkStream wsrawstream = null;
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private ConnectionStates state = 0;
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private int fragmentParsingState = 0;
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private Uri url = null;
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private byte[] readBuffer = new Byte[1024];
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private int readBufferLen = 0;
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private int accopcodes = 0;
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private bool accmask = false;
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private int acclen = 0;
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private bool proxyInUse = false;
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private string tlsCertFingerprint = null;
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//private ConnectionErrors lastError = ConnectionErrors.NoError;
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public bool xdebug = false;
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public bool xignoreCert = false;
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public string extraHeaders = null;
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public enum ConnectionStates
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{
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Disconnected = 0,
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Connecting = 1,
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Connected = 2
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}
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public enum ConnectionErrors
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{
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NoError = 0
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}
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public delegate void onBinaryDataHandler(byte[] data, int offset, int length);
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public event onBinaryDataHandler onBinaryData;
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public delegate void onStringDataHandler(string data);
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public event onStringDataHandler onStringData;
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public delegate void onDebugMessageHandler(string msg);
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public event onDebugMessageHandler onDebugMessage;
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public delegate void onStateChangedHandler(ConnectionStates state);
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public event onStateChangedHandler onStateChanged;
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public ConnectionStates State { get { return state; } }
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private void SetState(ConnectionStates newstate)
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{
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if (state == newstate) return;
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state = newstate;
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if (onStateChanged != null) { onStateChanged(state); }
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}
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public void Dispose()
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{
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if (wsstream != null) { try { wsstream.Close(); } catch (Exception) { } try { wsstream.Dispose(); } catch (Exception) { } wsstream = null; }
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if (wsclient != null) { wsclient = null; }
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SetState(ConnectionStates.Disconnected);
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}
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public void Debug(string msg) { if (onDebugMessage != null) { onDebugMessage(msg); } if (xdebug) { try { File.AppendAllText("debug.log", "Debug-" + msg + "\r\n"); } catch (Exception) { } } }
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public bool Start(Uri url, string tlsCertFingerprint)
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{
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if (state != ConnectionStates.Disconnected) return false;
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SetState(ConnectionStates.Connecting);
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this.url = url;
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this.tlsCertFingerprint = tlsCertFingerprint;
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Uri proxyUri = null;
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// Check if we need to use a HTTP proxy (Auto-proxy way)
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try
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{
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RegistryKey registryKey = Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings", true);
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Object x = registryKey.GetValue("AutoConfigURL", null);
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if ((x != null) && (x.GetType() == typeof(string)))
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{
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string proxyStr = GetProxyForUrlUsingPac("http" + ((url.Port == 80) ? "" : "s") + "://" + url.Host + ":" + url.Port, x.ToString());
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if (proxyStr != null) { proxyUri = new Uri("http://" + proxyStr); }
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}
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}
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catch (Exception) { proxyUri = null; }
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// Check if we need to use a HTTP proxy (Normal way)
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if (proxyUri == null)
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{
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var proxy = System.Net.HttpWebRequest.GetSystemWebProxy();
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proxyUri = proxy.GetProxy(url);
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if ((url.Host.ToLower() == proxyUri.Host.ToLower()) && (url.Port == proxyUri.Port)) { proxyUri = null; }
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}
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if (proxyUri != null)
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{
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// Proxy in use
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proxyInUse = true;
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wsclient = new TcpClient();
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wsclient.BeginConnect(proxyUri.Host, proxyUri.Port, new AsyncCallback(OnConnectSink), this);
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}
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else
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{
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// No proxy in use
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proxyInUse = false;
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wsclient = new TcpClient();
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wsclient.BeginConnect(url.Host, url.Port, new AsyncCallback(OnConnectSink), this);
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}
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return true;
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}
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private void OnConnectSink(IAsyncResult ar)
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{
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if (wsclient == null) return;
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// Accept the connection
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try
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{
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wsclient.EndConnect(ar);
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}
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catch (Exception ex)
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{
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Debug("Websocket TCP failed to connect: " + ex.ToString());
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Dispose();
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return;
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}
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if (proxyInUse == true)
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{
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// Send proxy connection request
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wsrawstream = wsclient.GetStream();
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byte[] proxyRequestBuf = UTF8Encoding.UTF8.GetBytes("CONNECT " + url.Host + ":" + url.Port + " HTTP/1.1\r\nHost: " + url.Host + ":" + url.Port + "\r\n\r\n");
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wsrawstream.Write(proxyRequestBuf, 0, proxyRequestBuf.Length);
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wsrawstream.BeginRead(readBuffer, readBufferLen, readBuffer.Length - readBufferLen, new AsyncCallback(OnProxyResponseSink), this);
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}
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else
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{
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// Start TLS connection
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Debug("Websocket TCP connected, doing TLS...");
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wsstream = new SslStream(wsclient.GetStream(), false, VerifyServerCertificate, null);
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wsstream.BeginAuthenticateAsClient(url.Host, null, System.Security.Authentication.SslProtocols.Tls12, false, new AsyncCallback(OnTlsSetupSink), this);
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}
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}
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private void OnProxyResponseSink(IAsyncResult ar)
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{
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if (wsrawstream == null) return;
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int len = 0;
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try { len = wsrawstream.EndRead(ar); } catch (Exception) { }
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if (len == 0)
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{
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// Disconnect
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Debug("Websocket proxy disconnected, length = 0.");
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Dispose();
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return;
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}
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readBufferLen += len;
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string proxyResponse = UTF8Encoding.UTF8.GetString(readBuffer, 0, readBufferLen);
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if (proxyResponse.IndexOf("\r\n\r\n") >= 0)
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{
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// We get a full proxy response, we should get something like "HTTP/1.1 200 Connection established\r\n\r\n"
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if (proxyResponse.StartsWith("HTTP/1.1 200 "))
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{
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// All good, start TLS setup.
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readBufferLen = 0;
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Debug("Websocket TCP connected, doing TLS...");
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wsstream = new SslStream(wsrawstream, false, VerifyServerCertificate, null);
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wsstream.BeginAuthenticateAsClient(url.Host, null, System.Security.Authentication.SslProtocols.Tls12, false, new AsyncCallback(OnTlsSetupSink), this);
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}
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else
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{
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// Invalid response
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Debug("Proxy connection failed: " + proxyResponse);
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Dispose();
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}
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}
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else
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{
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if (readBufferLen == readBuffer.Length)
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{
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// Buffer overflow
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Debug("Proxy connection failed");
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Dispose();
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}
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else
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{
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// Read more proxy data
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wsrawstream.BeginRead(readBuffer, readBufferLen, readBuffer.Length - readBufferLen, new AsyncCallback(OnProxyResponseSink), this);
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}
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}
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}
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public string Base64Encode(string plainText)
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{
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var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);
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return System.Convert.ToBase64String(plainTextBytes);
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}
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public string Base64Decode(string base64EncodedData)
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{
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var base64EncodedBytes = System.Convert.FromBase64String(base64EncodedData);
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return System.Text.Encoding.UTF8.GetString(base64EncodedBytes);
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}
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private void OnTlsSetupSink(IAsyncResult ar)
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{
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if (wsstream == null) return;
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// Accept the connection
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try
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{
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wsstream.EndAuthenticateAsClient(ar);
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}
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catch (Exception ex)
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{
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// Disconnect
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Debug("Websocket TLS failed: " + ex.ToString());
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Dispose();
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return;
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}
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// Send the HTTP headers
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Debug("Websocket TLS setup, sending HTTP header...");
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string header = "GET " + url.PathAndQuery + " HTTP/1.1\r\nHost: " + url.Host + "\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==\r\nSec-WebSocket-Version: 13\r\n" + extraHeaders + "\r\n";
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wsstream.Write(UTF8Encoding.UTF8.GetBytes(header));
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// Start receiving data
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wsstream.BeginRead(readBuffer, readBufferLen, readBuffer.Length - readBufferLen, new AsyncCallback(OnTlsDataSink), this);
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}
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private void OnTlsDataSink(IAsyncResult ar)
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{
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if (wsstream == null) return;
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int len = 0;
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try { len = wsstream.EndRead(ar); } catch (Exception) { }
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if (len == 0)
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{
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// Disconnect
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Debug("Websocket disconnected, length = 0.");
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Dispose();
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return;
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}
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//parent.Debug("#" + counter + ": Websocket got new data: " + len);
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readBufferLen += len;
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// Consume all of the data
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int consumed = 0;
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int ptr = 0;
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do
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{
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consumed = ProcessBuffer(readBuffer, ptr, readBufferLen - ptr);
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if (consumed < 0) { Dispose(); return; } // Error, close the connection
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ptr += consumed;
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} while ((consumed > 0) && ((readBufferLen - consumed) > 0));
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// Move the data forward
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if ((ptr > 0) && (readBufferLen - ptr) > 0)
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{
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//Console.Write("MOVE FORWARD\r\n");
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Array.Copy(readBuffer, ptr, readBuffer, 0, (readBufferLen - ptr));
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}
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readBufferLen = (readBufferLen - ptr);
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// If the buffer is too small, double the size here.
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if (readBuffer.Length - readBufferLen == 0)
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{
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Debug("Increasing the read buffer size from " + readBuffer.Length + " to " + (readBuffer.Length * 2) + ".");
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byte[] readBuffer2 = new byte[readBuffer.Length * 2];
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Array.Copy(readBuffer, 0, readBuffer2, 0, readBuffer.Length);
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readBuffer = readBuffer2;
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}
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// Receive more data
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try { wsstream.BeginRead(readBuffer, readBufferLen, readBuffer.Length - readBufferLen, new AsyncCallback(OnTlsDataSink), this); } catch (Exception) { }
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}
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private int ProcessBuffer(byte[] buffer, int offset, int len)
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{
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string ss = UTF8Encoding.UTF8.GetString(buffer, offset, len);
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if (state == ConnectionStates.Connecting)
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{
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// Look for the end of the http header
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string header = UTF8Encoding.UTF8.GetString(buffer, offset, len);
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int i = header.IndexOf("\r\n\r\n");
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if (i == -1) return 0;
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Dictionary<string, string> parsedHeader = ParseHttpHeader(header.Substring(0, i));
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if ((parsedHeader == null) || (parsedHeader["_Path"] != "101")) { Debug("Websocket bad header."); return -1; } // Bad header, close the connection
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Debug("Websocket got setup upgrade header.");
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SetState(ConnectionStates.Connected);
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fragmentParsingState = 1;
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return len; // TODO: Technically we need to return the header length before UTF8 convert.
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}
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else if (state == ConnectionStates.Connected)
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{
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if (fragmentParsingState == 1)
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{
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// Parse a websocket fragment header
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if (len < 2) return 0;
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int headsize = 2;
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accopcodes = buffer[offset];
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accmask = ((buffer[offset + 1] & 0x80) != 0);
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acclen = (buffer[offset + 1] & 0x7F);
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if ((accopcodes & 0x0F) == 8)
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{
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// Close the websocket
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Debug("Websocket got closed fragment.");
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return -1;
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}
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if (acclen == 126)
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{
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if (len < 4) return 0;
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headsize = 4;
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acclen = (buffer[offset + 2] << 8) + (buffer[offset + 3]);
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}
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else if (acclen == 127)
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{
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if (len < 10) return 0;
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headsize = 10;
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acclen = (buffer[offset + 6] << 24) + (buffer[offset + 7] << 16) + (buffer[offset + 8] << 8) + (buffer[offset + 9]);
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Debug("Websocket receive large fragment: " + acclen);
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}
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if (accmask == true)
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{
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// TODO: Do unmasking here.
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headsize += 4;
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}
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//parent.Debug("#" + counter + ": Websocket frag header - FIN: " + ((accopcodes & 0x80) != 0) + ", OP: " + (accopcodes & 0x0F) + ", LEN: " + acclen + ", MASK: " + accmask);
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fragmentParsingState = 2;
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return headsize;
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}
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if (fragmentParsingState == 2)
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{
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// Parse a websocket fragment data
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if (len < acclen) return 0;
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//Console.Write("WSREAD: " + acclen + "\r\n");
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ProcessWsBuffer(buffer, offset, acclen, accopcodes);
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fragmentParsingState = 1;
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return acclen;
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}
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}
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return 0;
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}
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private void ProcessWsBuffer(byte[] data, int offset, int len, int op)
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{
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if ((op & 1) == 0) {
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Debug("Websocket got binary data, len = " + len);
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if (onBinaryData != null) { onBinaryData(data, offset, len); }
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} else {
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Debug("Websocket got string data, len = " + len);
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if (onStringData != null) { onStringData(UTF8Encoding.UTF8.GetString(data, offset, len)); }
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}
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}
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private Dictionary<string, string> ParseHttpHeader(string header)
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{
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string[] lines = header.Replace("\r\n", "\r").Split('\r');
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if (lines.Length < 2) { return null; }
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string[] directive = lines[0].Split(' ');
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Dictionary<string, string> values = new Dictionary<string, string>();
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values["_Action"] = directive[0];
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values["_Path"] = directive[1];
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values["_Protocol"] = directive[2];
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for (int i = 1; i < lines.Length; i++)
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{
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var j = lines[i].IndexOf(":");
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values[lines[i].Substring(0, j).ToLower()] = lines[i].Substring(j + 1).Trim();
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}
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return values;
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}
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// Return a modified base64 SHA384 hash string of the certificate public key
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public static string GetMeshKeyHash(X509Certificate cert)
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{
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return ByteArrayToHexString(new SHA384Managed().ComputeHash(cert.GetPublicKey()));
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}
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// Return a modified base64 SHA384 hash string of the certificate
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public static string GetMeshCertHash(X509Certificate cert)
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{
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return ByteArrayToHexString(new SHA384Managed().ComputeHash(cert.GetRawCertData()));
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}
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public static string ByteArrayToHexString(byte[] Bytes)
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{
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StringBuilder Result = new StringBuilder(Bytes.Length * 2);
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string HexAlphabet = "0123456789ABCDEF";
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foreach (byte B in Bytes) { Result.Append(HexAlphabet[(int)(B >> 4)]); Result.Append(HexAlphabet[(int)(B & 0xF)]); }
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return Result.ToString();
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}
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private bool VerifyServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
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{
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return ((tlsCertFingerprint == GetMeshKeyHash(certificate)) || (tlsCertFingerprint == certificate.GetCertHashString()));
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}
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public void SendString(string data)
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{
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if (state != ConnectionStates.Connected) return;
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// Convert the string into a buffer with 4 byte of header space.
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int len = UTF8Encoding.UTF8.GetByteCount(data);
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byte[] buf = new byte[4 + len];
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UTF8Encoding.UTF8.GetBytes(data, 0, data.Length, buf, 4);
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len = buf.Length - 4;
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// Check that everything is ok
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if ((len < 1) || (len > 65535)) { Dispose(); return; }
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//Console.Write("Length: " + len + "\r\n");
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//System.Threading.Thread.Sleep(0);
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if (len < 126)
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{
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// Small fragment
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buf[2] = 129; // Fragment op code (129 = text, 130 = binary)
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buf[3] = (byte)(len & 0x7F);
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//try { wsstream.BeginWrite(buf, 2, len + 2, new AsyncCallback(WriteWebSocketAsyncDone), args); } catch (Exception) { Dispose(); return; }
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wsstream.Write(buf, 2, len + 2);
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}
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else
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{
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// Large fragment
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buf[0] = 129; // Fragment op code (129 = text, 130 = binary)
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buf[1] = 126;
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buf[2] = (byte)((len >> 8) & 0xFF);
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buf[3] = (byte)(len & 0xFF);
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//try { wsstream.BeginWrite(buf, 0, len + 4, new AsyncCallback(WriteWebSocketAsyncDone), args); } catch (Exception) { Dispose(); return; }
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wsstream.Write(buf, 0, len + 4);
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}
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}
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public void SendBinary(byte[] data, int offset, int len)
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{
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if (state != ConnectionStates.Connected) return;
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// Convert the string into a buffer with 4 byte of header space.
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byte[] buf = new byte[4 + len];
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Array.Copy(data, offset, buf, 4, len);
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len = buf.Length - 4;
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// Check that everything is ok
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if ((len < 1) || (len > 65535)) { Dispose(); return; }
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//Console.Write("Length: " + len + "\r\n");
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//System.Threading.Thread.Sleep(0);
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if (len < 126)
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{
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// Small fragment
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buf[2] = 130; // Fragment op code (129 = text, 130 = binary)
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buf[3] = (byte)(len & 0x7F);
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//try { wsstream.BeginWrite(buf, 2, len + 2, new AsyncCallback(WriteWebSocketAsyncDone), args); } catch (Exception) { Dispose(); return; }
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wsstream.Write(buf, 2, len + 2);
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}
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else
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{
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// Large fragment
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buf[0] = 130; // Fragment op code (129 = text, 130 = binary)
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buf[1] = 126;
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buf[2] = (byte)((len >> 8) & 0xFF);
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buf[3] = (byte)(len & 0xFF);
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|
//try { wsstream.BeginWrite(buf, 0, len + 4, new AsyncCallback(WriteWebSocketAsyncDone), args); } catch (Exception) { Dispose(); return; }
|
|
wsstream.Write(buf, 0, len + 4);
|
|
}
|
|
}
|
|
|
|
public static string GetProxyForUrlUsingPac(string DestinationUrl, string PacUri)
|
|
{
|
|
IntPtr WinHttpSession = Win32Api.WinHttpOpen("User", Win32Api.WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, IntPtr.Zero, IntPtr.Zero, 0);
|
|
|
|
Win32Api.WINHTTP_AUTOPROXY_OPTIONS ProxyOptions = new Win32Api.WINHTTP_AUTOPROXY_OPTIONS();
|
|
Win32Api.WINHTTP_PROXY_INFO ProxyInfo = new Win32Api.WINHTTP_PROXY_INFO();
|
|
|
|
ProxyOptions.dwFlags = Win32Api.WINHTTP_AUTOPROXY_CONFIG_URL;
|
|
ProxyOptions.dwAutoDetectFlags = (Win32Api.WINHTTP_AUTO_DETECT_TYPE_DHCP | Win32Api.WINHTTP_AUTO_DETECT_TYPE_DNS_A);
|
|
ProxyOptions.lpszAutoConfigUrl = PacUri;
|
|
|
|
// Get Proxy
|
|
bool IsSuccess = Win32Api.WinHttpGetProxyForUrl(WinHttpSession, DestinationUrl, ref ProxyOptions, ref ProxyInfo);
|
|
Win32Api.WinHttpCloseHandle(WinHttpSession);
|
|
|
|
if (IsSuccess)
|
|
{
|
|
return ProxyInfo.lpszProxy;
|
|
}
|
|
else
|
|
{
|
|
Console.WriteLine("Error: {0}", Win32Api.GetLastError());
|
|
return null;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
}
|