Take the 2-minute tour ×
Information Security Stack Exchange is a question and answer site for Information security professionals. It's 100% free, no registration required.

With my current interest in the CRIME attack, I am currently trying to check if there actually exits a way to "fingerprint" a server that supports SPDY?

My research lead me to believe only that the response header "X-Firefox-SPDY" can help. Is there another way?

share|improve this question
    
Do you have malicious intent? –  Lucas Kauffman Sep 23 '12 at 9:20
    
Nope. None what so ever. My question stemmed from the fact that I could only detect SPDY existence on Twitter, GMail, etc. by means of the response header. So I wanted to know if you have a way to detect it. That is all. –  Metahuman Sep 23 '12 at 9:52
2  
Try to connect to it using SPDY protocol, one would soon find out if there is SPDY there or not... –  ewanm89 Sep 24 '12 at 0:53
add comment

1 Answer

The answer to your question would depend on the context in which you're interested.

If you're interested in detecting SPDY servers while browsing the web you'll first need a browser that supports SPDY (e.g. Firefox 11+ or Chrome). In this scenario the best way to detect SPDY is browser dependant.

For Chrome there are a couple of ways:

  • You can browse to chrome://net-internals/#spdy for a list of all currently open SPDY connections (because SPDY connections are persistent - every tab that contains a document from a server which supports SPDY should be present).
  • If you're interested only in the current tab you might examine the window.chrome.loadTimes().wasFetchedViaSpdy DOM property.

For Firefox, the only way I'm aware of is to look for the presence of X-Firefox-Spdy response header. Do note that for this to work, you must enable SPDY support (it is on by default as of Firefox 13, otherwise - set network.http.spdy.enabled to true.

All this depends on using a SPDY enabled browser, and manually checking servers. If you'll want to automate this, use a browser that doesn't support SPDY, or just plainly skip the browser - you'll need another strategy. As I see you have two options in this case:

  • SPDY servers can be configured to advertise their support of SPDY when sending HTTP responses. This would require you to inspect the presence of the appropriate Alternative-Protocol headers (outlined in the SPDY draft).

  • Simply establish a TCP connection to the server an send it a SETTIGNS (HELLO) or a SYN_STREAM frame and see if it responds according to the SPDY protocol.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.