Question

How to protect the System.io.stream object from being decompiled

Asked by: CarlosScheidecker

I have someone claiming that if he gets a hold of my DLL that makes a SSL call to a web service with username and password, he can decompile the System.io.Stream object and look at my XMLDocument payload and get the login credentials.

How can I protect the code from a decompiler getting my credentials from my XMlDocument payload before I even send my stream over SSL?

string str = "TEST DATA";
string uri =
"https://127.0.0.1:8443/MYLOGINPAGE/AMCWEBLOGINGATEWAY?LOGINID=guest&PASSWD=passwd12";
HttpWebRequest request = (HttpWebRequest)
WebRequest.Create(uri);request.KeepAlive = false;
request.ProtocolVersion=HttpVersion.Version10;
request.Method = "POST";
 
byte[] postBytes = Encoding.ASCII.GetBytes(str);
request.ContentType = "text";
request.ContentLength = postBytes.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(postBytes, 0, postBytes.Length);
requestStream.Close();

                                  
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Asked On
2009-10-19 at 08:58:26ID24823965
Tags

C# https webservices webrequest Stream

Topic

C# Programming Language

Participating Experts
1
Points
500
Comments
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Answers

 

by: Omego2KPosted on 2009-10-19 at 09:22:22ID: 25606592

I am guessing he means he could "decompile" the dll and not a specific document. You can easily do this with the IL disassembler that comes with VS. There is no guaranteed way to protect against this. You could however make it so hard to do that no one will waste their time on it. By that I don't mean stop the assembly from being disassembled, but prevent the person from understanding the code. For this you need to use an obfuscator especially with string encryption. A good obfuscator will make code so hard to read that it will take great amounts of time and man power to understand what all the code means. My suggestion for a great and free obfuscator is:

Eazfuscator
located at:
http://www.foss.kharkov.ua/g1/projects/eazfuscator/dotnet/Default.aspx

20120131-EE-VQP-002

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