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Re: Using detection_filter instead of threshold
From: Matthew Jonkman <jonkman () emergingthreatspro com>
Date: Wed, 27 Oct 2010 16:50:28 -0400

Comments below still apply, but I misread that threshold was going to be disallowed in a rule in the next release, 
whereas it actually says event_filter will be disallowed. My Bad. 

But still, if this is open software, I suspect the majority of users want to keep thresholding within a rule. Having 
the option to do it in both places I think is good. Because we distribute a lot of rules that need a threshold built 
in. Doing that in a separate file is difficult, because as mentioned, no one wants to have to look at a separate file 
for EVERY rule they look at to see if it's listed there by sid. It's just a huge opportunity to introduce human error 
in the analysis process. 

Can we see where this is going on the dev roadmap? When will threshold go away? How can we keep it? Can we get 
event_filter and such allowed within the rule itself if threshold is going away?

And why'd we change anyway?

Matt

On Oct 27, 2010, at 2:03 PM, Matthew Jonkman wrote:

Is this 2.9.0?

I also vote to keep it in the rule. It's a major pain in the ass to have to look at your threshold.conf EVERY time 
you look at a rule, or you'll not know why you only got x number of hits. Or you'll not know that the events continue 
but are being suppressed.

I don't recall any community input saying we wanted it changed... nor any sound reasoning why it should change. Did I 
miss those discussions and conversation? This is open software after all. No?

Matt


On Oct 27, 2010, at 1:13 PM, Eric L. Howard wrote:

On Wed, Oct 27, 2010 at 12:47 PM, L0rd Ch0de1m0rt
<l0rdch0de1m0rt () gmail com> wrote:
Thanks.  Is there any way to do it in the rule itself like back in the
salad days?

Nope.

DEPRECATED ITEMS
================

* detection_filter replaces the existing in-rule threshold, which is now
obsolete.  Furthermore, the existing threshold when used within a rule was
not part of the detection process; it was equivalent to a standalone
threshold.  To retain the functionality of existing in-rule thresholds,
reformat them as standalone event_filters (see below).

* event_filter replaces the existing standalone threshold, which is now
deprecated.  Furthermore, even though event_filter is an alias for threshold,
which is allowed to appear in a rule (although that use is now also
deprecated), event_filter will not be allowed in a rule.  Such use will
result in a fatal error during initialization.

~elh

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----------------------------------------------------
Matthew Jonkman
Emergingthreats.net
Emerging Threats Pro
Open Information Security Foundation (OISF)
Phone 765-807-8630
Fax 312-264-0205
http://www.emergingthreatspro.com
http://www.openinfosecfoundation.org
----------------------------------------------------

PGP: http://www.jonkmans.com/mattjonkman.asc





----------------------------------------------------
Matthew Jonkman
Emergingthreats.net
Emerging Threats Pro
Open Information Security Foundation (OISF)
Phone 765-807-8630
Fax 312-264-0205
http://www.emergingthreatspro.com
http://www.openinfosecfoundation.org
----------------------------------------------------

PGP: http://www.jonkmans.com/mattjonkman.asc




------------------------------------------------------------------------------
Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in  U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store 
http://p.sf.net/sfu/nokia-dev2dev
_______________________________________________
Snort-sigs mailing list
Snort-sigs () lists sourceforge net
https://lists.sourceforge.net/lists/listinfo/snort-sigs


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