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Network Security Snort-Signatures
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Re: [Snort-sigs] Snort Community Rules Update

from [Nerijus Krukauskas] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] Snort Community Rules Update
Date: Fri, 23 Sep 2005 08:30:38 +0300 
On 22/09/05, Alex Kirk <alex.kirk@sourcefire.com> wrote:

After a quick bit of grepping through the source, it turns out that the
answer is actually pretty straightforward: Snort doesn't like rules
whose only content/uricontent clauses are negated (see the function
IsPureNotRule in fpcreate.c and its comments). While I'm not intimately
familiar enough with the fast pattern matcher to say concretely, I
believe this is because not having a content item to search for causes
some real problems, and possibly even breaks it altogether.


  That clarifies a lot. A quick grep through all the rules shows that
there are not a single one (except the one I reported) rule with only
negated content.
  Thanks for explanation!

  And to: rmkml. I suppose you don't need the debug output on this
matter anymore, do you? :)

--
http://nk99.org/


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