[Bro-Dev] ASCII response filetype

Seth Hall seth at corelight.com
Mon Sep 18 13:59:31 PDT 2017

On 18 Sep 2017, at 16:43, Keith Lehigh wrote:

> Hi Folks,
>     I’ve been mulling over an addition to the file mime type 
> signature that consists of “1 to 16 ASCII readable characters”.  
> 16 is an arbitrary length cutoff.  The purpose of this signature would 
> be to log instances where a short status code is returned by a web 
> service.  I see lots of responses like “[]” or “OK” or 
> “Success” and currently these are logged in files.log as unknown 
> file types.  I think Bro would be improved by logging a filetype for 
> these responses.

What about creating a mime type for an enumerated list of all of the 
ones you find?  With a pattern like /^(OK|Success|0|1)$/

That was you could avoid other short responses from getting caught up in 
the net.  I also suspect that [] should be something different because 
if you see that over HTTP, it's probably in most cases just an empty 
JSON array.

Seth Hall * Corelight, Inc * www.corelight.com

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