Snort mailing list archives
Re: Snort in front of WAF or behind?
From: Jason Haar <Jason.Haar () trimble co nz>
Date: Wed, 03 Feb 2010 15:32:03 +1300
On 02/03/2010 11:24 AM, Jefferson, Shawn wrote:
I’m putting in a WAF in the next two weeks, and I’m deciding on where to put it, in front of my network tap with Snort, or behind the network tap with Snort. I’m thinking it’s better to put it in front of the network tap with Snort, and let the WAF do the inspection, filtering and alerting of HTTP(S) traffic. A couple of benefits of doing it this way that I see: 1. WAF will know more about how the HTTP applications are configured and what is good and what is bad input. 2. It will decrease the load (marginally) on the Snort box, since it won’t have to inspect the traffic that is already going to be filtered at the WAF. Anybody have input on this scenario? It seems just like the “Snort in front of the firewall or behind the firewall” debate… but I might be missing something.
We're doing this. First layer is a firewall to block all the crud (ie block everything but web). Second is the WAF: it acts as HTTPS terminator (ie any HTTPS traffic ends on the WAF - the WAF talks to backends over HTTP), can block HTTP-specific bad things, AND HAS GREAT LOGGING (cannot stress that enough). Then snort lies behind the WAF and (as it's HTTP instead of HTTPS) gets to see what's left over. Obviously, if your WAF is perfect, you'll never see snort trigger - well - actually snort would also have to be perfect for that to be true - but you get the point ;-) -- Cheers Jason Haar Information Security Manager, Trimble Navigation Ltd. Phone: +64 3 9635 377 Fax: +64 3 9635 417 PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1 ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- Snort in front of WAF or behind? Jefferson, Shawn (Feb 02)
- Re: Snort in front of WAF or behind? Joel Esler (Feb 02)
- Re: Snort in front of WAF or behind? Jason Haar (Feb 02)