/*
*
*
*/
private void SendRequest2RedirectLocation(RequestObj pRequestObj)
{
String lRedirectLocationHTTPS = pRequestObj.ServerWebResponse.GetResponseHeader("Location");
String lRedirectLocationHTTP = pRequestObj.getRequestedURL();
try { RedirectCache.Instance.addElement(lRedirectLocationHTTP, lRedirectLocationHTTPS); } catch { }
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing() : TYPE Http2Https3XXSameURL \"{0}\" -> \"{1}\"", lRedirectLocationHTTP, lRedirectLocationHTTPS), Logging.Level.DEBUG, pRequestObj.Counter);
// Close the preceding WebResponse (stream & headers)
pRequestObj.ServerResponseHeaders.Clear();
if (pRequestObj.ServerWebResponse != null)
{
pRequestObj.ServerWebResponse.Close();
}
RequestObj lTmpReqObj = (RequestObj)pRequestObj.Clone();
Uri lTmpUri = new Uri(lRedirectLocationHTTPS);
lTmpReqObj.Scheme = lTmpUri.Scheme;
lTmpReqObj.Host = lTmpUri.Host;
lTmpReqObj.Path = lTmpUri.PathAndQuery;
if (lTmpReqObj.ClientRequestHeaders.ContainsKey("host"))
{
lTmpReqObj.ClientRequestHeaders.Remove("host");
lTmpReqObj.ClientRequestHeaders.Add("host", lTmpReqObj.Host);
}
lTmpReqObj.Counter++;
this.DoHttpProcessing(lTmpReqObj);
pRequestObj.ServerWebResponse = lTmpReqObj.ServerWebResponse;
pRequestObj.ServerResponseHeaders = lTmpReqObj.ServerResponseHeaders;
}
/*
*
*
*/
public void HandleClientRequest(RequestObj pRequestObj)
{
String lHTTPRequestString = pRequestObj.ClientStreamReader.ReadLine();
if (String.IsNullOrEmpty(lHTTPRequestString))
{
throw new Exception("Client request stream corrupted.");
}
// Read the request headers from the client and copy them to the request settings
// Set values : METHOD scheme://host/Path
Logging.LogMessage(String.Format("HTTPClientRequest.HandleClientRequest() : HTTP Request string: \"{0}\"", lHTTPRequestString), Logging.Level.DEBUG, pRequestObj.Counter);
pRequestObj.parseRequestString(lHTTPRequestString);
this.ReadRequestHeadersFromClient(pRequestObj);
pRequestObj.Host = pRequestObj.ClientRequestHeaders["host"].ToString();
pRequestObj.Scheme = "http";
/*
* Verify if request parameters are correct.
*/
if (!Regex.Match(pRequestObj.Method.ToLower(), @"^\s*(get|put|post|head|delete|trace|options|connect)\s*$").Success)
{
throw new WebException("Client request contains an unsupproted request method");
}
String lRequestedURL = String.Format("{0}://{1}{2}", pRequestObj.Scheme, pRequestObj.Host, pRequestObj.Path);
/*
* If HTTP request was redirected to an other URL in a previous request
* replace current request with the redirect location
*/
if (RedirectCache.Instance.NeedsRequestBeMapped(lRequestedURL))
{
Logging.LogMessage(String.Format("HTTPClientRequest.HandleClientRequest() : REDIRECT(301/302) from \"{0}\" to \"{1}\"", lRequestedURL, RedirectCache.Instance.GetElement(lRequestedURL).URL), Logging.Level.INFO, pRequestObj.Counter);
// DO SSL STRIPPING THINGS HERE !!!!
// Replace the URL by the URL saved in the cache ...
RedirectHost lTmpHost = RedirectCache.Instance.GetElement(pRequestObj.getRequestedURL());
pRequestObj.Method = "GET";
pRequestObj.Scheme = lTmpHost.Scheme;
pRequestObj.Host = lTmpHost.Host;
pRequestObj.Path = lTmpHost.Path;
lTmpHost.IncCounter();
} // if (RedirectCac...
/*
* If HTTP request was answered with an HSTS server response header
* conduct an HTTPS request instead of HTTP
*/
else if (HSTSCache.Instance.GetElement(pRequestObj.Host) != null)
{
Logging.LogMessage(String.Format("HTTPClientRequest.HandleClientRequest() : HSTS protocol replacement : http://{0} -> https://{0} \n", pRequestObj.Host), Logging.Level.DEBUG, pRequestObj.Counter);
pRequestObj.Scheme = "https";
} // if (HSTSCache...
try
{
/*
* Forward request according to the URL defined
* in the command line parameter.
*/
if (!String.IsNullOrEmpty(Config.RedirectToURL) && pRequestObj.Method.ToLower() == "get")
{
HTTPRedirect.getInstance().processRequest(pRequestObj.ClientStream, Config.RedirectToURL, pRequestObj.ClientRequestHeaders);
}
else
{
this.DoHttpProcessing(pRequestObj);
}
}
catch (WebException lEx)
{
/*
* 1. Sending server response
*/
var lResponse = lEx.Response as HttpWebResponse;
if (lResponse != null && lResponse.StatusCode != HttpStatusCode.OK)
{
String ErrorCode = String.Format("HTTP/{0} {1} {2}\n", lResponse.ProtocolVersion, (int)lResponse.StatusCode, lResponse.StatusDescription);
pRequestObj.ClientStream.Write(Encoding.ASCII.GetBytes(ErrorCode), 0, ErrorCode.Length);
}
else
{
String ErrorCode = String.Format("HTTP/1.1 500 Internal server error\n");
pRequestObj.ClientStream.Write(Encoding.ASCII.GetBytes(ErrorCode), 0, ErrorCode.Length);
} // if (lRespon...
/*
* 2. Sending server response headers
*/
if (lEx.Response != null && lEx.Response.Headers != null && lEx.Response.Headers.Count > 0)
{
foreach (String la in lEx.Response.Headers.AllKeys)
{
String lResp = String.Format("{0}: {1}\n", la, lEx.Response.Headers[la]);
pRequestObj.ClientStream.Write(Encoding.ASCII.GetBytes(lResp), 0, lResp.Length);
} // foreach (Stri...
} // if (lEx.Resp ...
pRequestObj.ClientStream.Write(Encoding.ASCII.GetBytes("\n"), 0, 1);
/*
* 3. Sending server response body
*/
try
{
var resp = new StreamReader(lEx.Response.GetResponseStream()).ReadToEnd();
pRequestObj.ClientStream.Write(Encoding.ASCII.GetBytes(resp), 0, resp.Length);
}
catch (Exception lEx2)
{
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing(EXCEPTION2) : {0} -> {1} \n{2}", pRequestObj.getRequestedURL(), lEx.Message, lEx.StackTrace), Logging.Level.ERROR, pRequestObj.Counter);
}
}
catch (Exception lEx)
{
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing(EXCEPTION) : {0} -> {1} \n{2}", pRequestObj.getRequestedURL(), lEx.Message, lEx.StackTrace), Logging.Level.ERROR, pRequestObj.Counter);
}
finally
{
if (pRequestObj.ClientStreamReader != null)
{
pRequestObj.ClientStreamReader.Close();
}
if (pRequestObj.ClientStream != null)
{
pRequestObj.ClientStream.Close();
}
if (pRequestObj.ServerWebResponse != null)
{
pRequestObj.ServerWebResponse.Close();
}
}
}
/*
*
*
*/
public void DoHttpProcessing(RequestObj pRequestObj)
{
String lHTTPRequestString = String.Empty;
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing() : Client {0} requested URL : \"{1}\"", pRequestObj.SrcIP, pRequestObj.getRequestedURL()), Logging.Level.INFO, pRequestObj.Counter);
/*
* Process HTTP request.
* 1. Detect HTTP Redirect requests
* 2. Cache new HTTP Redirect locations
* 3. Recognize incoming client requests that need to be SSL-Stripped
* 4. Process reqular HTTP requests
*
*
*
* 1. Client requests a SSL-Stripping page found in the RedirectCache
* The requested URL previously was detected as a "HTTP 301/302 Redirect" to a SSL/TLS protected web site.
* Skip the HTTP/Redirect part and directly proxy the data from the SSL/TLS protected website to the user.
*
* Format : SCHEME://HOST
*/
// 2. Send client request URL to server and parse response headers
pRequestObj.ServerResponseHeaders.Clear();
cServerRequestHandler.sendRequestAndParseServerResponseHeader(pRequestObj);
RedirectType lRedirType = this.DetermineRedirectType(pRequestObj);
/*
* The HTTP client request triggers a regular HTML data response.
* 1. Transfer the server response (Server response string, headers, data)
*/
if (lRedirType == RedirectType.Http2http2XX)
{
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing() : TYPE Http2http2XX \"{0}\" -> \"-\"", pRequestObj.getRequestedURL()), Logging.Level.DEBUG, pRequestObj.Counter);
/*
* The HTTP client request triggers a request to a HTTP URL
* 1. Transfer the server response (Server response string, headers, data)
*/
}
else if (lRedirType == RedirectType.Http2Http3XX)
{
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing() : TYPE Http2Http3XX \"{0}\" -> \"{1}\"", pRequestObj.getRequestedURL(), pRequestObj.ServerWebResponse.GetResponseHeader("Location")), Logging.Level.DEBUG, pRequestObj.Counter);
/*
* The HTTP client request triggers a request to a HTTP URL
* 1. Cache the HTTP/HTTPS mapping
* 2. Replace the "https" scheme in the redirect location by "http"
* 3. Transfer the server response (Server response string, headers, data)
*/
}
else if (lRedirType == RedirectType.Http2Https3XXDifferentURL)
{
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing() : TYPE Http2Http3XXDifferentURL \"{0}\" -> \"{1}\"", pRequestObj.getRequestedURL(), pRequestObj.ServerWebResponse.GetResponseHeader("Location")), Logging.Level.DEBUG, pRequestObj.Counter);
this.SendRequest2RedirectLocation(pRequestObj);
/*
* 1. Resend the same request again to the same URL but with "https" scheme instead of "http"
* 2. Transfer the server response (Server response string, headers, data)
*/
}
else if (lRedirType == RedirectType.Http2Https3XXSameURL)
{
// Save redirect information in cache
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing() : TYPE Http2Https3XXSameURL \"{0}\" -> \"{1}\"", pRequestObj.getRequestedURL(), pRequestObj.ServerWebResponse.GetResponseHeader("Location")), Logging.Level.DEBUG, pRequestObj.Counter);
this.SendRequest2RedirectLocation(pRequestObj);
/*
* The HTTP client request triggers a regular HTML data response.
* 1. Transfer the server response (Server response string, headers, data)
*/
}
else if (lRedirType == RedirectType.Https2Http2XX)
{
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing() : TYPE Https2Http2XX"), Logging.Level.DEBUG, pRequestObj.Counter);
/*
* This should never happen!!
* We're lost in an endless loop!
*/
}
else if (lRedirType == RedirectType.Https2Https3XXSameURL)
{
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing() : TYPE Https2HttpsRedirectSameURL\n\n\n\nHOOOOONK\n\n\n"), Logging.Level.DEBUG, pRequestObj.Counter);
String lLogData = String.Format("HTTPClientRequest.DoHttpProcessing() : \"{0}\" -> \"{1}\"", pRequestObj.getRequestedURL(), pRequestObj.ServerResponseHeaders.Find(item => item.Item1 == "Location"));
Logging.LogMessage(lLogData, Logging.Level.DEBUG);
}
else if (lRedirType == RedirectType.Https2Https3XXDifferentURL)
{
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing() : TYPE Https2HttpsRedirectDiffrentURL"), Logging.Level.DEBUG, pRequestObj.Counter);
/*
* The HTTP client request triggers a request to a HTTP URL
* 1. Cache the HTTP/HTTPS mapping
* 2. Replace the "https" scheme in the redirect location by "http"
* 3. Transfer the server response (Server response string, headers, data)
*/
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing() : TYPE Https2Https3XXDifferentURL \"{0}\" -> \"{1}\"", pRequestObj.getRequestedURL(), pRequestObj.ServerWebResponse.GetResponseHeader("Location")), Logging.Level.DEBUG, pRequestObj.Counter);
this.SendRequest2RedirectLocation(pRequestObj);
/*
* This should never happen!!
* No clue what to do at this point!
*/
}
else
{
Logging.LogMessage(String.Format("HTTPClientRequest.DoHttpProcessing() : TYPE definition error for URL \"{0}\" ", pRequestObj.getRequestedURL()), Logging.Level.DEBUG, pRequestObj.Counter);
}
cServerRequestHandler.sendServerResponse2Client(pRequestObj);
String lPipeData = lPipeData = String.Format("HTTPClientRequest.DoHttpProcessing() : TCP||{0}||{1}||{2}||{3}||{4}||{5}\r\n", pRequestObj.SrcMAC, pRequestObj.SrcIP, pRequestObj.SrcPort, Config.RemoteHostIP, Config.RemoteHostPort, pRequestObj.HTTPLogData);
Program.WriteToPipe(lPipeData);
}
/*
*
*
*/
public void sendRequestAndParseServerResponseHeader(RequestObj pRequestObj)
{
char[] lPostBuffer;
int lPOSTBytesRead = 0;
int lTotalBytesRead = 0;
StreamWriter lSW = null;
String lTmpStr = String.Empty;
String lTmpBuf = String.Empty;
String lPOSTData = String.Empty;
Logging.LogMessage(String.Format("HTTPClientRequest.sendRequestAndParseServerResponseHeader() : Requesting URL \"{0}\"", pRequestObj.getRequestedURL()), Logging.Level.DEBUG, pRequestObj.Counter);
/*
* Setup the http request to send on behalf of the actual client.
* Neutralize the server certificate validation.
*/
ServicePointManager.ServerCertificateValidationCallback = delegate { return(true); };
pRequestObj.ServerWebRequest = (HttpWebRequest)HttpWebRequest.Create(pRequestObj.getRequestedURL());
pRequestObj.ServerWebRequest.Method = pRequestObj.Method;
pRequestObj.ServerWebRequest.ProtocolVersion = System.Net.HttpVersion.Version10;
pRequestObj.ServerWebRequest.Timeout = 10000;
pRequestObj.ServerWebRequest.Proxy = null;
pRequestObj.ServerWebRequest.KeepAlive = false;
pRequestObj.ServerWebRequest.AllowAutoRedirect = false;
pRequestObj.ServerWebRequest.AutomaticDecompression = DecompressionMethods.None;
this.SetClientRequestHTTPHeaders(pRequestObj.ClientRequestHeaders, ref pRequestObj.ServerWebRequest);
/*
* Send POST data to remote server
*/
if (pRequestObj.Method.ToUpper() == "POST")
{
lPostBuffer = new char[pRequestObj.ClientRequestContentLen];
lTotalBytesRead = 0;
lSW = new StreamWriter(pRequestObj.ServerWebRequest.GetRequestStream());
while (lTotalBytesRead < pRequestObj.ClientRequestContentLen && (lPOSTBytesRead = pRequestObj.ClientStreamReader.ReadBlock(lPostBuffer, 0, pRequestObj.ClientRequestContentLen)) > 0)
{
lTmpStr = new string(lPostBuffer);
lTotalBytesRead += lPOSTBytesRead;
lSW.Write(lPostBuffer, 0, lPOSTBytesRead);
lTmpBuf += lTmpStr;
} // while (lTotalBytes...
if (lSW != null)
{
lSW.Close();
}
if (lTmpBuf != null && lTmpBuf.Length > 0)
{
lPOSTData = lTmpBuf.ToString();
}
} // if (lMethod.To...
// Read and parse server response headers
// Build HTTP request data string
pRequestObj.ServerWebResponse = (HttpWebResponse)pRequestObj.ServerWebRequest.GetResponse();
this.ProcessServerResponseHeaders(pRequestObj);
// Create Data log string
pRequestObj.HTTPLogData = String.Empty;
foreach (String lKey in pRequestObj.ServerWebResponse.Headers.AllKeys)
{
pRequestObj.HTTPLogData += String.Format("..{0}: {1}", lKey, pRequestObj.ServerWebRequest.Headers[lKey]);
}
pRequestObj.HTTPLogData += String.Format("....{0}", lPOSTData);
}
