CODEWITHSUNDEEP
c#sslstream
David
David

Reputation: 428

.Net SSL/TLS Passthrough

I'm wanting to do a protocol analysis that uses SSL/TLS fortunately I can install my own certificate and the DNS portion won't be an issue. My problem is what do I use to do this. I've considered using paros but it will be more trouble than it's worth. So I thought I could write two C# applications. The first is the pseudo server and the other is the pseudo client. The both have a tcp connection between the two of them that I can then use wireshark on. The problem is, is that I have very little experience with streams. So if anyone could point me to helpful articles or if the code is pretty short a sample would be great. Thank you in advanced.

Upvotes: 0

Views: 409

Answers (1)

Aren
Aren

Reputation: 55946

It's not terribly hard to Read/Write to/from streams, you can't just connect the streams, you'll need to have your own code to do this. Preferably on it's own thread (or worker process or task or whatever threading concept you need).

public void ConnectStreams(Stream inStream, Stream outStream)
{
    byte[] buffer = new byte[1024];
    int bytesRead = 0;

    while((bytesRead = inStream.Read(buffer, 0, 1024)) != 0)
    {
        outStream.Write(buffer, 0, bytesRead);
        outStream.Flush();
    }
}

Basically Streams operate on byte arrays. When we run this line:

while((bytesRead = inStream.Read(buffer, 0, 1024)) != 0)

We are basically saying, perform Read on inStream, put the read bytes into buffer, at index 0 (in buffer) and read a max of 1024 bytes.

Then we assign the return value into bytesRead which is the number of ACTUAL bytes read (between 0 and 1024 in this case) and if that is not equal to 0, continue looping.

Then we simply write it back into the outStream with the buffer containing the data, and the number of bytes actually read. We perform a flush to actually force the output out vs. stacking up in an internal buffer.

When the stream reaches the EOF, .Read will return 0, the loop will exit and you can continue on. This is how you "Connect" two streams at the most simple level.

Upvotes: 2

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