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Create a rule that takes its content from a file.
From: arneu sneu <arneu99 () hotmail com>
Date: Tue, 14 May 2013 14:07:19 +0000


I just installed Snort a few days ago and started to play with it by writing my own rules.
I would like my rule to take its content from a file, but I haven't find any information on this topic, neither in the 
manual, nor on the Internet. I found that the content-list keyword once existed in Snort, but it has apparently been 
removed about 6 years ago. Too bad, because it was exactly what I was looking for.
Would anybody have an idea on how to do such a thing with current snort features? I could write a rule for each of the 
lines of my file or use pcre with the list of possible values, but I was wondering if there was a way to do it with a 
rule taking its content from a file. If not, what is the correct approach to do this?

As an example, if I have a file containing a whitelist of file extensions, I would like to raise an alert when an email 
attachment having an extension that is not in the list is seen in the network traffic.

Many thanks for your help.



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