Consuming Hidden WCF RIA Services

 原文 http://codeseekah.com/2013/07/05/consuming-hidden-wcf-ria-services/

A Silverlight application made it to my desk yesterday, an application that consumed a remote WCF RIA service running on a Microsoft IIS. The service did not provide a public API, nor did disassembly with dotPeek help get the service manifests to construct a WCF client with. WSDL files weren’t exposed either. A new, custom client was to be written by reverse engineering what was available without any fancy configurations.

Consuming Hidden WCF RIA Services

 

A bit of Wiresharking around and the protocol details became exposed for some low-level replication. The payloads were encoded, and the Content-Type> header hinted at application/msbin1, which made it pretty clear that it was in .NET Binary Format. Decoding was simple by switching to Fiddler and a WCF Binary Inspector. Having retrieved the payloads sending binary to the private service was quite straight-forward in C#.

...



using System.Xml;

using System.Net;



...



/* Write .NET Binary XML */

System.IO.Stream s = new System.IO.MemoryStream();           

XmlWriter binarywriter = XmlDictionaryWriter.CreateBinaryWriter(s);



binarywriter.WriteStartElement("Action1", "http://tempuri.org/");

...

binarywriter.Flush();



s.Seek(0, System.IO.SeekOrigin.Begin);

byte[] b = new byte[s.Length];

s.Read(b, 0, (int)s.Length);



HttpWebRequest request = (HttpWebRequest)WebRequest.Create("hidden.svc/binary/Action1");

request.Method = "POST";

request.ContentType = "application/msbin1";

request.GetRequestStream().Write(b, 0, b.Length);

HttpWebResponse response = (HttpWebResponse)request.GetResponse();



/* Read .NET XML */

b = new byte[response.ContentLength];

response.GetResponseStream().Read(b, 0, b.Length);



XmlReader binaryreader = XmlDictionaryReader.CreateBinaryReader(b, XmlDictionaryReaderQuotas.Max);

XmlDocument xdoc = new XmlDocument();

xdoc.Load(binaryreader);

...

Needs the System, System.Net, System.Runtime.Serialization and System.XML assemblies.

To consume hidden WCF RIA services on other platforms check out xml2wcf.py

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