Re: Ideal way to update the rules

[Anshuman Anil Deshmukh <anshuman () cybage com>]

Thank you.



Currently if the -T switch is used then it only processes the text based rules but it also disables all the existing 
shared object rules.



Can anybody tell us how could we just process the text based rules on daily basis using a cron job without disabling 
the existing shared object rules? We will update the shared object rules say once or twice a week by completely 
stopping the snort process till we are on pf_ring.



Regards,

Anshuman



From: Livio Ricciulli [mailto:livio () metaflows com]
Sent: Tuesday, July 29, 2014 1:26 AM
To: snort-users () lists sourceforge net<mailto:snort-users () lists sourceforge net>
Subject: Re: [Snort-users] Ideal way to update the rules



This might be a bit of a project but the way we handle rule updating without service interruption is to exploit a nice 
side-effect of pf_ring.
pf_ring distributes packets to multiple snort processes to execute in parallel; when one of the processes dies the 
others pickup the slack almost instantly.
When it is added back it gets its portion of the traffic again. So, we kill one process at a time every few seconds 
updating all processes without ever losing service.
There will be some loss in session states but it is a lot better than no service.. Getting pf_ring inline to work can 
be tricky, but once it does, your get the added benefit
of higher performance also.

Let me know if you need more information on that.

I hope this helps,

Livio.
On 07/28/2014 10:18 AM, Anshuman Anil Deshmukh wrote:

   Hi,



   I have a couple of questions regarding updating the rules automatically and then sending a HUP signal to barnyard 
and Snort after every time we update the rules.



   We intend to use so rules. I understand that the HUP signal cannot be sent when downloading and processing the so 
rules, then the only option left is to stop Barnyard  & Snort completely. In our case we would be having snort working 
as inline and hence don't recommend reinitializing the snort completely as it would break the network connection (our 
DAQ is AFPACKET)



   Questions:

   1.       How regularly are so_rules released and how should they updated (daily/weekly/any other option)?

   2.       How could one keep the so rules as well text based rules updated with pulledpork? Do we need to have 
different schedules for updating so_rules and text based rules? If yes, is it like we need to have separate 
configuration files one for text based rules and and other for so_rules ?



   We are using Snort version 2.9.6.1 and pulledpork version 0.70





   Regards,

   Anshuman




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