private static void HandleClient(TcpClient client)
{
Stream clientStream = client.GetStream();
var clientStreamReader = new CustomBinaryReader(clientStream, Encoding.ASCII);
var clientStreamWriter = new StreamWriter(clientStream);
Uri httpRemoteUri;
try
{
//read the first line HTTP command
var httpCmd = clientStreamReader.ReadLine();
if (string.IsNullOrEmpty(httpCmd))
{
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, null);
return;
}
//break up the line into three components (method, remote URL & Http Version)
var httpCmdSplit = httpCmd.Split(SpaceSplit, 3);
var httpVerb = httpCmdSplit[0];
if (httpVerb.ToUpper() == "CONNECT")
httpRemoteUri = new Uri("http://" + httpCmdSplit[1]);
else
httpRemoteUri = new Uri(httpCmdSplit[1]);
var httpVersion = httpCmdSplit[2];
var excluded = ExcludedHttpsHostNameRegex.Any(x => Regex.IsMatch(httpRemoteUri.Host, x));
//Client wants to create a secure tcp tunnel (its a HTTPS request)
if (httpVerb.ToUpper() == "CONNECT" && !excluded && httpRemoteUri.Port == 443)
{
httpRemoteUri = new Uri("https://" + httpCmdSplit[1]);
clientStreamReader.ReadAllLines();
WriteConnectResponse(clientStreamWriter, httpVersion);
var certificate = CertManager.CreateCertificate(httpRemoteUri.Host);
SslStream sslStream = null;
try
{
sslStream = new SslStream(clientStream, true);
//Successfully managed to authenticate the client using the fake certificate
sslStream.AuthenticateAsServer(certificate, false,
SslProtocols.Tls | SslProtocols.Ssl3 | SslProtocols.Ssl2, false);
clientStreamReader = new CustomBinaryReader(sslStream, Encoding.ASCII);
clientStreamWriter = new StreamWriter(sslStream);
//HTTPS server created - we can now decrypt the client's traffic
clientStream = sslStream;
}
catch
{
if (sslStream != null)
sslStream.Dispose();
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, null);
return;
}
httpCmd = clientStreamReader.ReadLine();
}
else if (httpVerb.ToUpper() == "CONNECT")
{
clientStreamReader.ReadAllLines();
WriteConnectResponse(clientStreamWriter, httpVersion);
TcpHelper.SendRaw(clientStreamReader.BaseStream, null, null, httpRemoteUri.Host, httpRemoteUri.Port,
false);
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, null);
return;
}
//Now create the request
HandleHttpSessionRequest(client, httpCmd, clientStream, clientStreamReader, clientStreamWriter,
httpRemoteUri.Scheme == Uri.UriSchemeHttps ? httpRemoteUri.OriginalString : null);
}
catch
{
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, null);
}
}
private static void HandleClientRequest(TcpClient Client)
{
string connectionGroup = null;
Stream clientStream = null;
CustomBinaryReader clientStreamReader = null;
StreamWriter connectStreamWriter = null;
string tunnelHostName = null;
int tunnelPort = 0;
try
{
connectionGroup = Dns.GetHostEntry(((IPEndPoint)Client.Client.RemoteEndPoint).Address).HostName;
clientStream = Client.GetStream();
clientStreamReader = new CustomBinaryReader(clientStream, Encoding.ASCII);
string securehost = null;
List<string> requestLines = new List<string>();
string tmpLine;
while (!String.IsNullOrEmpty(tmpLine = clientStreamReader.ReadLine()))
{
requestLines.Add(tmpLine);
}
//read the first line HTTP command
String httpCmd = requestLines.Count > 0 ? requestLines[0] : null;
if (String.IsNullOrEmpty(httpCmd))
{
throw new EndOfStreamException();
}
//break up the line into three components
String[] splitBuffer = httpCmd.Split(spaceSplit, 3);
String method = splitBuffer[0];
String remoteUri = splitBuffer[1];
Version version;
string RequestVersion;
if (splitBuffer[2] == "HTTP/1.1")
{
version = new Version(1, 1);
RequestVersion = "HTTP/1.1";
}
else
{
version = new Version(1, 0);
RequestVersion = "HTTP/1.0";
}
if (splitBuffer[0].ToUpper() == "CONNECT")
{
//Browser wants to create a secure tunnel
//instead = we are going to perform a man in the middle "attack"
//the user's browser should warn them of the certification errors,
//so we need to install our root certficate in users machine as Certificate Authority.
remoteUri = "https://" + splitBuffer[1];
tunnelHostName = splitBuffer[1].Split(':')[0];
int.TryParse(splitBuffer[1].Split(':')[1], out tunnelPort);
if (tunnelPort == 0) tunnelPort = 80;
var isSecure = true;
for (int i = 1; i < requestLines.Count; i++)
{
var rawHeader = requestLines[i];
String[] header = rawHeader.ToLower().Trim().Split(colonSpaceSplit, 2, StringSplitOptions.None);
if ((header[0] == "host"))
{
var hostDetails = header[1].ToLower().Trim().Split(':');
if (hostDetails.Length > 1)
{
isSecure = false;
}
}
}
requestLines.Clear();
connectStreamWriter = new StreamWriter(clientStream);
connectStreamWriter.WriteLine(RequestVersion + " 200 Connection established");
connectStreamWriter.WriteLine(String.Format("Timestamp: {0}", DateTime.Now.ToString()));
connectStreamWriter.WriteLine(String.Format("connection:close"));
connectStreamWriter.WriteLine();
connectStreamWriter.Flush();
if (tunnelPort != 443)
{
TcpHelper.SendRaw(tunnelHostName, tunnelPort, clientStreamReader.BaseStream);
if (clientStream != null)
clientStream.Close();
return;
}
Monitor.Enter(certificateAccessLock);
var _certificate = CertificateHelper.GetCertificate(RootCertificateName, tunnelHostName);
Monitor.Exit(certificateAccessLock);
SslStream sslStream = null;
if (!pinnedCertificateClients.Contains(tunnelHostName) && isSecure)
{
sslStream = new SslStream(clientStream, true);
try
{
sslStream.AuthenticateAsServer(_certificate, false, SslProtocols.Tls | SslProtocols.Ssl3 | SslProtocols.Ssl2, false);
}
catch (AuthenticationException ex)
{
if (pinnedCertificateClients.Contains(tunnelHostName) == false)
{
pinnedCertificateClients.Add(tunnelHostName);
}
throw ex;
}
}
else
{
TcpHelper.SendRaw(tunnelHostName, tunnelPort, clientStreamReader.BaseStream);
if (clientStream != null)
clientStream.Close();
return;
}
clientStreamReader = new CustomBinaryReader(sslStream, Encoding.ASCII);
//HTTPS server created - we can now decrypt the client's traffic
clientStream = sslStream;
while (!String.IsNullOrEmpty(tmpLine = clientStreamReader.ReadLine()))
{
requestLines.Add(tmpLine);
}
//read the new http command.
httpCmd = requestLines.Count > 0 ? requestLines[0] : null;
if (String.IsNullOrEmpty(httpCmd))
{
throw new EndOfStreamException();
}
securehost = remoteUri;
}
int count = 0;
SessionEventArgs args = new SessionEventArgs(BUFFER_SIZE);
while (!String.IsNullOrEmpty(httpCmd))
{
count++;
MemoryStream mw = null;
StreamWriter sw = null;
args = new SessionEventArgs(BUFFER_SIZE);
try
{
splitBuffer = httpCmd.Split(spaceSplit, 3);
if (splitBuffer.Length != 3)
{
TcpHelper.SendRaw(httpCmd, tunnelHostName, ref requestLines, args.IsSecure, clientStreamReader.BaseStream);
if (clientStream != null)
clientStream.Close();
return;
}
method = splitBuffer[0];
remoteUri = splitBuffer[1];
if (splitBuffer[2] == "HTTP/1.1")
{
version = new Version(1, 1);
}
else
{
version = new Version(1, 0);
}
if (securehost != null)
{
remoteUri = securehost + remoteUri;
args.IsSecure = true;
}
//construct the web request that we are going to issue on behalf of the client.
args.ProxyRequest = (HttpWebRequest)HttpWebRequest.Create(remoteUri.Trim());
args.ProxyRequest.Proxy = null;
args.ProxyRequest.UseDefaultCredentials = true;
args.ProxyRequest.Method = method;
args.ProxyRequest.ProtocolVersion = version;
args.ClientStream = clientStream;
args.ClientStreamReader = clientStreamReader;
for (int i = 1; i < requestLines.Count; i++)
{
var rawHeader = requestLines[i];
String[] header = rawHeader.ToLower().Trim().Split(colonSpaceSplit, 2, StringSplitOptions.None);
if ((header[0] == "upgrade") && (header[1] == "websocket"))
{
TcpHelper.SendRaw(httpCmd, tunnelHostName, ref requestLines, args.IsSecure, clientStreamReader.BaseStream);
if (clientStream != null)
clientStream.Close();
return;
}
}
ReadRequestHeaders(ref requestLines, args.ProxyRequest);
int contentLen = (int)args.ProxyRequest.ContentLength;
args.ProxyRequest.AllowAutoRedirect = false;
args.ProxyRequest.AutomaticDecompression = DecompressionMethods.None;
if (BeforeRequest != null)
{
args.Hostname = args.ProxyRequest.RequestUri.Host;
args.RequestURL = args.ProxyRequest.RequestUri.OriginalString;
args.RequestLength = contentLen;
args.HttpVersion = version;
args.Port = ((IPEndPoint)Client.Client.RemoteEndPoint).Port;
args.ipAddress = ((IPEndPoint)Client.Client.RemoteEndPoint).Address;
args.IsAlive = args.ProxyRequest.KeepAlive;
BeforeRequest(null, args);
}
if (args.Cancel)
{
if (args.IsAlive)
{
requestLines.Clear();
while (!String.IsNullOrEmpty(tmpLine = clientStreamReader.ReadLine()))
{
requestLines.Add(tmpLine);
}
httpCmd = requestLines.Count > 0 ? requestLines[0] : null;
continue;
}
else
break;
}
args.ProxyRequest.ConnectionGroupName = connectionGroup;
args.ProxyRequest.AllowWriteStreamBuffering = true;
args.FinishedRequestEvent = new ManualResetEvent(false);
if (method.ToUpper() == "POST" || method.ToUpper() == "PUT")
{
args.ProxyRequest.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), args);
}
else
{
args.ProxyRequest.BeginGetResponse(new AsyncCallback(HandleServerResponse), args);
}
if (args.IsSecure)
{
if (args.ProxyRequest.Method == "POST" || args.ProxyRequest.Method == "PUT")
args.FinishedRequestEvent.WaitOne();
else
args.FinishedRequestEvent.Set();
}
else
args.FinishedRequestEvent.WaitOne();
httpCmd = null;
if (args.ProxyRequest.KeepAlive)
{
requestLines.Clear();
while (!String.IsNullOrEmpty(tmpLine = clientStreamReader.ReadLine()))
{
requestLines.Add(tmpLine);
}
httpCmd = requestLines.Count() > 0 ? requestLines[0] : null;
}
if (args.ServerResponse != null)
args.ServerResponse.Close();
}
catch (IOException ex)
{
throw ex;
}
catch (UriFormatException ex)
{
throw ex;
}
catch (WebException ex)
{
throw ex;
}
finally
{
if (sw != null) sw.Close();
if (mw != null) mw.Close();
if (args.ProxyRequest != null) args.ProxyRequest.Abort();
if (args.ServerResponseStream != null) args.ServerResponseStream.Close();
}
}
}
catch (AuthenticationException ex)
{
Debug.WriteLine(ex.Message);
}
catch (EndOfStreamException ex)
{
Debug.WriteLine(ex.Message);
}
catch (IOException ex)
{
Debug.WriteLine(ex.Message);
}
catch (UriFormatException ex)
{
Debug.WriteLine(ex.Message);
}
catch (WebException ex)
{
Debug.WriteLine(ex.Message);
}
finally
{
if (connectStreamWriter != null)
connectStreamWriter.Close();
if (clientStreamReader != null)
clientStreamReader.Close();
if (clientStream != null)
clientStream.Close();
}
}
private static void HandleHttpSessionRequest(TcpClient client, string httpCmd, Stream clientStream,
CustomBinaryReader clientStreamReader, StreamWriter clientStreamWriter, string secureTunnelHostName)
{
TcpConnection connection = null;
string lastRequestHostName = null;
while (true)
{
if (string.IsNullOrEmpty(httpCmd))
{
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, null);
break;
}
var args = new SessionEventArgs(BUFFER_SIZE);
args.Client.TcpClient = client;
try
{
//break up the line into three components (method, remote URL & Http Version)
var httpCmdSplit = httpCmd.Split(SpaceSplit, 3);
var httpMethod = httpCmdSplit[0];
var httpRemoteUri =
new Uri(secureTunnelHostName == null ? httpCmdSplit[1] : (secureTunnelHostName + httpCmdSplit[1]));
var httpVersion = httpCmdSplit[2];
Version version;
if (httpVersion == "HTTP/1.1")
{
version = new Version(1, 1);
}
else
{
version = new Version(1, 0);
}
if (httpRemoteUri.Scheme == Uri.UriSchemeHttps)
{
args.IsHttps = true;
}
args.ProxySession.Request.RequestHeaders = new List<HttpHeader>();
string tmpLine;
while (!string.IsNullOrEmpty(tmpLine = clientStreamReader.ReadLine()))
{
var header = tmpLine.Split(new char[] { ':' }, 2);
args.ProxySession.Request.RequestHeaders.Add(new HttpHeader(header[0], header[1]));
}
SetRequestHeaders(args.ProxySession.Request.RequestHeaders, args.ProxySession);
if (args.ProxySession.Request.UpgradeToWebSocket)
{
TcpHelper.SendRaw(clientStreamReader.BaseStream, httpCmd, args.ProxySession.Request.RequestHeaders,
httpRemoteUri.Host, httpRemoteUri.Port, httpRemoteUri.Scheme == Uri.UriSchemeHttps);
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, args);
return;
}
args.ProxySession.Request.RequestUri = httpRemoteUri;
args.ProxySession.Request.Method = httpMethod;
args.ProxySession.Request.HttpVersion = httpVersion;
args.Client.ClientStream = clientStream;
args.Client.ClientStreamReader = clientStreamReader;
args.Client.ClientStreamWriter = clientStreamWriter;
args.ProxySession.Request.Hostname = args.ProxySession.Request.RequestUri.Host;
args.ProxySession.Request.Url = args.ProxySession.Request.RequestUri.OriginalString;
args.Client.ClientPort = ((IPEndPoint)client.Client.RemoteEndPoint).Port;
args.Client.ClientIpAddress = ((IPEndPoint)client.Client.RemoteEndPoint).Address;
//If requested interception
if (BeforeRequest != null)
{
args.ProxySession.Request.Encoding = args.ProxySession.GetEncoding();
BeforeRequest(null, args);
}
args.ProxySession.Request.RequestLocked = true;
if (args.ProxySession.Request.CancelRequest)
{
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, args);
break;
}
//construct the web request that we are going to issue on behalf of the client.
connection = connection == null ?
TcpConnectionManager.GetClient(args.ProxySession.Request.RequestUri.Host, args.ProxySession.Request.RequestUri.Port, args.IsHttps)
: lastRequestHostName != args.ProxySession.Request.Hostname ? TcpConnectionManager.GetClient(args.ProxySession.Request.RequestUri.Host, args.ProxySession.Request.RequestUri.Port, args.IsHttps)
: connection;
lastRequestHostName = args.ProxySession.Request.Hostname;
args.ProxySession.SetConnection(connection);
args.ProxySession.SendRequest();
//If request was modified by user
if (args.ProxySession.Request.RequestBodyRead)
{
args.ProxySession.Request.ContentLength = args.ProxySession.Request.RequestBody.Length;
var newStream = args.ProxySession.ProxyClient.ServerStreamReader.BaseStream;
newStream.Write(args.ProxySession.Request.RequestBody, 0, args.ProxySession.Request.RequestBody.Length);
}
else
{
//If its a post/put request, then read the client html body and send it to server
if (httpMethod.ToUpper() == "POST" || httpMethod.ToUpper() == "PUT")
{
SendClientRequestBody(args);
}
}
HandleHttpSessionResponse(args);
//if connection is closing exit
if (args.ProxySession.Response.ResponseKeepAlive == false)
{
connection.TcpClient.Close();
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, args);
return;
}
// read the next request
httpCmd = clientStreamReader.ReadLine();
}
catch
{
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, args);
break;
}
}
if (connection != null)
TcpConnectionManager.ReleaseClient(connection);
}
//Send chunked response
private static void WriteResponseBodyChunked(CustomBinaryReader inStreamReader, Stream outStream)
{
while (true)
{
var chuchkHead = inStreamReader.ReadLine();
var chunkSize = int.Parse(chuchkHead, NumberStyles.HexNumber);
if (chunkSize != 0)
{
var buffer = inStreamReader.ReadBytes(chunkSize);
var chunkHead = Encoding.ASCII.GetBytes(chunkSize.ToString("x2"));
outStream.Write(chunkHead, 0, chunkHead.Length);
outStream.Write(NewLineBytes, 0, NewLineBytes.Length);
outStream.Write(buffer, 0, chunkSize);
outStream.Write(NewLineBytes, 0, NewLineBytes.Length);
inStreamReader.ReadLine();
}
else
{
inStreamReader.ReadLine();
outStream.Write(ChunkEnd, 0, ChunkEnd.Length);
break;
}
}
}
private static void HandleHttpSessionRequest(TcpClient client, string httpCmd, Stream clientStream, CustomBinaryReader clientStreamReader, StreamWriter clientStreamWriter, string secureTunnelHostName)
{
if (String.IsNullOrEmpty(httpCmd))
{
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, null);
return;
}
var args = new SessionEventArgs(BUFFER_SIZE);
args.client = client;
try
{
//break up the line into three components (method, remote URL & Http Version)
String[] httpCmdSplit = httpCmd.Split(spaceSplit, 3);
var httpMethod = httpCmdSplit[0];
var httpRemoteUri = new Uri(secureTunnelHostName == null ? httpCmdSplit[1] : (secureTunnelHostName + httpCmdSplit[1]));
var httpVersion = httpCmdSplit[2];
Version version;
if (httpVersion == "HTTP/1.1")
{
version = new Version(1, 1);
}
else
{
version = new Version(1, 0);
}
if (httpRemoteUri.Scheme == Uri.UriSchemeHttps)
{
args.isHttps = true;
}
args.requestHeaders = new List<HttpHeader>();
string tmpLine = null;
while (!String.IsNullOrEmpty(tmpLine = clientStreamReader.ReadLine()))
{
String[] header = tmpLine.Split(colonSpaceSplit, 2, StringSplitOptions.None);
args.requestHeaders.Add(new HttpHeader(header[0], header[1]));
}
for (int i = 0; i < args.requestHeaders.Count; i++)
{
var rawHeader = args.requestHeaders[i];
//if request was upgrade to web-socket protocol then relay the request without proxying
if ((rawHeader.Name.ToLower() == "upgrade") && (rawHeader.Value.ToLower() == "websocket"))
{
TcpHelper.SendRaw(clientStreamReader.BaseStream, httpCmd, args.requestHeaders, httpRemoteUri.Host, httpRemoteUri.Port, httpRemoteUri.Scheme == Uri.UriSchemeHttps);
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, args);
return;
}
}
//construct the web request that we are going to issue on behalf of the client.
args.proxyRequest = (HttpWebRequest)HttpWebRequest.Create(httpRemoteUri);
args.proxyRequest.Proxy = null;
args.proxyRequest.UseDefaultCredentials = true;
args.proxyRequest.Method = httpMethod;
args.proxyRequest.ProtocolVersion = version;
args.clientStream = clientStream;
args.clientStreamReader = clientStreamReader;
args.clientStreamWriter = clientStreamWriter;
args.proxyRequest.AllowAutoRedirect = false;
args.proxyRequest.AutomaticDecompression = DecompressionMethods.None;
args.requestHostname = args.proxyRequest.RequestUri.Host;
args.requestURL = args.proxyRequest.RequestUri.OriginalString;
args.clientPort = ((IPEndPoint)client.Client.RemoteEndPoint).Port;
args.clientIpAddress = ((IPEndPoint)client.Client.RemoteEndPoint).Address;
args.requestHttpVersion = version;
args.requestIsAlive = args.proxyRequest.KeepAlive;
args.proxyRequest.ConnectionGroupName = args.requestHostname;
args.proxyRequest.AllowWriteStreamBuffering = true;
//If requested interception
if (BeforeRequest != null)
{
args.requestEncoding = args.proxyRequest.GetEncoding();
BeforeRequest(null, args);
}
args.RequestLocked = true;
if (args.cancelRequest)
{
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, args);
return;
}
SetRequestHeaders(args.requestHeaders, args.proxyRequest);
//If request was modified by user
if (args.requestBodyRead)
{
args.proxyRequest.ContentLength = args.requestBody.Length;
Stream newStream = args.proxyRequest.GetRequestStream();
newStream.Write(args.requestBody, 0, args.requestBody.Length);
args.proxyRequest.BeginGetResponse(new AsyncCallback(HandleHttpSessionResponse), args);
}
else
{
//If its a post/put request, then read the client html body and send it to server
if (httpMethod.ToUpper() == "POST" || httpMethod.ToUpper() == "PUT")
{
SendClientRequestBody(args);
}
//Http request body sent, now wait asynchronously for response
args.proxyRequest.BeginGetResponse(new AsyncCallback(HandleHttpSessionResponse), args);
}
//Now read the next request (if keep-Alive is enabled, otherwise exit this thread)
//If client is pipeling the request, this will be immediately hit before response for previous request was made
httpCmd = clientStreamReader.ReadLine();
//Http request body sent, now wait for next request
Task.Factory.StartNew(() => HandleHttpSessionRequest(args.client, httpCmd, args.clientStream, args.clientStreamReader, args.clientStreamWriter, secureTunnelHostName));
}
catch
{
Dispose(client, clientStream, clientStreamReader, clientStreamWriter, args);
}
}
private static void HandleHttpSessionRequest(TcpClient Client, string httpCmd, Stream clientStream, string tunnelHostName, List<string> requestLines, CustomBinaryReader clientStreamReader, string securehost)
{
if (httpCmd == null) return;
var args = new SessionEventArgs(BUFFER_SIZE);
args.Client = Client;
args.tunnelHostName = tunnelHostName;
args.securehost = securehost;
try
{
//break up the line into three components (method, remote URL & Http Version)
var splitBuffer = httpCmd.Split(spaceSplit, 3);
if (splitBuffer.Length != 3)
{
TcpHelper.SendRaw(httpCmd, tunnelHostName, ref requestLines, args.IsSSLRequest, clientStreamReader.BaseStream);
if (clientStream != null)
clientStream.Close();
return;
}
var method = splitBuffer[0];
var remoteUri = splitBuffer[1];
Version version;
if (splitBuffer[2] == "HTTP/1.1")
{
version = new Version(1, 1);
}
else
{
version = new Version(1, 0);
}
if (securehost != null)
{
remoteUri = securehost + remoteUri;
args.IsSSLRequest = true;
}
//construct the web request that we are going to issue on behalf of the client.
args.ProxyRequest = (HttpWebRequest)HttpWebRequest.Create(remoteUri.Trim());
args.ProxyRequest.Proxy = null;
args.ProxyRequest.UseDefaultCredentials = true;
args.ProxyRequest.Method = method;
args.ProxyRequest.ProtocolVersion = version;
args.ClientStream = clientStream;
args.ClientStreamReader = clientStreamReader;
for (int i = 1; i < requestLines.Count; i++)
{
var rawHeader = requestLines[i];
String[] header = rawHeader.ToLower().Trim().Split(colonSpaceSplit, 2, StringSplitOptions.None);
//if request was upgrade to web-socket protocol then relay the request without proxying
if ((header[0] == "upgrade") && (header[1] == "websocket"))
{
TcpHelper.SendRaw(httpCmd, tunnelHostName, ref requestLines, args.IsSSLRequest, clientStreamReader.BaseStream);
if (clientStream != null)
clientStream.Close();
return;
}
}
ReadRequestHeaders(ref requestLines, args.ProxyRequest);
int contentLen = (int)args.ProxyRequest.ContentLength;
args.ProxyRequest.AllowAutoRedirect = false;
args.ProxyRequest.AutomaticDecompression = DecompressionMethods.None;
//If requested interception
if (BeforeRequest != null)
{
args.RequestHostname = args.ProxyRequest.RequestUri.Host;
args.RequestURL = args.ProxyRequest.RequestUri.OriginalString;
args.RequestLength = contentLen;
args.RequestHttpVersion = version;
args.ClientPort = ((IPEndPoint)Client.Client.RemoteEndPoint).Port;
args.ClientIpAddress = ((IPEndPoint)Client.Client.RemoteEndPoint).Address;
args.RequestIsAlive = args.ProxyRequest.KeepAlive;
BeforeRequest(null, args);
}
string tmpLine;
if (args.CancelRequest)
{
if (args.RequestIsAlive)
{
requestLines.Clear();
while (!String.IsNullOrEmpty(tmpLine = clientStreamReader.ReadLine()))
{
requestLines.Add(tmpLine);
}
httpCmd = requestLines.Count > 0 ? requestLines[0] : null;
return;
}
else
return;
}
args.ProxyRequest.ConnectionGroupName = args.RequestHostname;
args.ProxyRequest.AllowWriteStreamBuffering = true;
//If request was modified by user
if (args.RequestWasModified)
{
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] requestBytes = encoding.GetBytes(args.RequestHtmlBody);
args.ProxyRequest.ContentLength = requestBytes.Length;
Stream newStream = args.ProxyRequest.GetRequestStream();
newStream.Write(requestBytes, 0, requestBytes.Length);
args.ProxyRequest.BeginGetResponse(new AsyncCallback(HandleHttpSessionResponse), args);
}
else
{
//If its a post/put request, then read the client html body and send it to server
if (method.ToUpper() == "POST" || method.ToUpper() == "PUT")
{
args.ProxyRequest.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), args);
}
else
{
//otherwise wait for response asynchronously
args.ProxyRequest.BeginGetResponse(new AsyncCallback(HandleHttpSessionResponse), args);
//Now read the next request (if keep-Alive is enabled, otherwise exit thus thread)
//If client is pipeling the request, this will be immediately hit before response for previous request was made
if (args.ProxyRequest.KeepAlive)
{
requestLines = new List<string>();
requestLines.Clear();
while (!String.IsNullOrEmpty(tmpLine = args.ClientStreamReader.ReadLine()))
{
requestLines.Add(tmpLine);
}
httpCmd = requestLines.Count() > 0 ? requestLines[0] : null;
HandleHttpSessionRequest(Client, httpCmd, args.ClientStream, args.tunnelHostName, requestLines, args.ClientStreamReader, args.securehost);
}
}
}
}
catch (IOException)
{
return;
}
catch (UriFormatException)
{
return;
}
catch (WebException)
{
return;
}
finally
{
}
}
private static void HandleClient(TcpClient Client)
{
Stream clientStream = null;
CustomBinaryReader clientStreamReader = null;
StreamWriter connectStreamWriter = null;
string tunnelHostName = null;
int tunnelPort = 0;
try
{
clientStream = Client.GetStream();
clientStreamReader = new CustomBinaryReader(clientStream, Encoding.ASCII);
string securehost = null;
List<string> requestLines = new List<string>();
string tmpLine;
while (!String.IsNullOrEmpty(tmpLine = clientStreamReader.ReadLine()))
{
requestLines.Add(tmpLine);
}
//read the first line HTTP command
String httpCmd = requestLines.Count > 0 ? requestLines[0] : null;
if (String.IsNullOrEmpty(httpCmd))
{
throw new EndOfStreamException();
}
//break up the line into three components (method, remote URL & Http Version)
String[] splitBuffer = httpCmd.Split(spaceSplit, 3);
String method = splitBuffer[0];
String remoteUri = splitBuffer[1];
Version version;
string RequestVersion;
if (splitBuffer[2] == "HTTP/1.1")
{
version = new Version(1, 1);
RequestVersion = "HTTP/1.1";
}
else
{
version = new Version(1, 0);
RequestVersion = "HTTP/1.0";
}
//Client wants to create a secure tcp tunnel (its a HTTPS request)
if (splitBuffer[0].ToUpper() == "CONNECT")
{
//Browser wants to create a secure tunnel
//instead = we are going to perform a man in the middle "attack"
//the user's browser should warn them of the certification errors,
//to avoid that we need to install our root certficate in users machine as Certificate Authority.
remoteUri = "https://" + splitBuffer[1];
tunnelHostName = splitBuffer[1].Split(':')[0];
int.TryParse(splitBuffer[1].Split(':')[1], out tunnelPort);
if (tunnelPort == 0) tunnelPort = 80;
var isSecure = true;
for (int i = 1; i < requestLines.Count; i++)
{
var rawHeader = requestLines[i];
String[] header = rawHeader.ToLower().Trim().Split(colonSpaceSplit, 2, StringSplitOptions.None);
if ((header[0] == "host"))
{
var hostDetails = header[1].ToLower().Trim().Split(':');
if (hostDetails.Length > 1)
{
isSecure = false;
}
}
}
requestLines.Clear();
connectStreamWriter = new StreamWriter(clientStream);
connectStreamWriter.WriteLine(RequestVersion + " 200 Connection established");
connectStreamWriter.WriteLine(String.Format("Timestamp: {0}", DateTime.Now.ToString()));
connectStreamWriter.WriteLine(String.Format("connection:close"));
connectStreamWriter.WriteLine();
connectStreamWriter.Flush();
//If port is not 443 its not a HTTP request, so just relay
if (tunnelPort != 443)
{
TcpHelper.SendRaw(tunnelHostName, tunnelPort, clientStreamReader.BaseStream);
if (clientStream != null)
clientStream.Close();
return;
}
//Create the fake certificate signed using our fake certificate authority
Monitor.Enter(certificateAccessLock);
var _certificate = ProxyServer.CertManager.CreateCertificate(tunnelHostName);
Monitor.Exit(certificateAccessLock);
SslStream sslStream = null;
//Pinned certificate clients cannot be proxied
//Example dropbox.com uses certificate pinning
//So just relay the request after identifying it by first failure
if (!pinnedCertificateClients.Contains(tunnelHostName) && isSecure)
{
sslStream = new SslStream(clientStream, true);
try
{
//Successfully managed to authenticate the client using the fake certificate
sslStream.AuthenticateAsServer(_certificate, false, SslProtocols.Tls | SslProtocols.Ssl3 | SslProtocols.Ssl2, false);
}
catch (AuthenticationException ex)
{
//if authentication failed it could be because client uses pinned certificates
//So add the hostname to this list so that next time we can relay without touching it (tunnel the request)
if (pinnedCertificateClients.Contains(tunnelHostName) == false)
{
pinnedCertificateClients.Add(tunnelHostName);
}
throw ex;
}
}
else
{
//Hostname was a previously failed request due to certificate pinning, just relay (tunnel the request)
TcpHelper.SendRaw(tunnelHostName, tunnelPort, clientStreamReader.BaseStream);
if (clientStream != null)
clientStream.Close();
return;
}
clientStreamReader = new CustomBinaryReader(sslStream, Encoding.ASCII);
//HTTPS server created - we can now decrypt the client's traffic
clientStream = sslStream;
while (!String.IsNullOrEmpty(tmpLine = clientStreamReader.ReadLine()))
{
requestLines.Add(tmpLine);
}
//read the new http command.
httpCmd = requestLines.Count > 0 ? requestLines[0] : null;
if (String.IsNullOrEmpty(httpCmd))
{
throw new EndOfStreamException();
}
securehost = remoteUri;
}
//Now create the request
HandleHttpSessionRequest(Client, httpCmd, clientStream, tunnelHostName, requestLines, clientStreamReader, securehost);
}
catch (AuthenticationException)
{
return;
}
catch (EndOfStreamException)
{
return;
}
catch (IOException)
{
return;
}
catch (UriFormatException)
{
return;
}
catch (WebException)
{
return;
}
finally
{
}
}