[Snort-users] Snort on web servers behind reverse proxies

Jason security at ...5028...
Thu May 1 12:10:57 EDT 2008


you will have to post process it. check out snortunified.pm for a 
framework tat makes it easy.

Tudor Panaitescu wrote:
> 
> Hi
> 
> First of all I did some research and couldn't find anything about this, so
> no flames please :-)
> 
> Here is the story. We have some reverse proxies/application
> accelerators/etc. (let's call them reverse proxies for now) in front of our
> web site. We don't control these reverse proxies and I am not sure if the
> provider has any IDS capabilities on those. I have snort (2.8.0.2)
> installed on the actual web servers but the only thing that I see in the
> alerts is the IP addresses of the reverse proxies, which is normal. Now,
> the reverse proxies, in their http requests to the web servers, they add 2
> entries in the headers: X-Forwarded-For: <origin's IP address> and
> True-Client-IP: <origin's IP address>. Is it a way to modify the rules to
> alert using  any of these IP addresses instead of the IP address(es) of the
> reverse proxies ?
> 
> Any help/idea would be appreciated.
> 
> Thanks and all the best,
> Tudor
> 
> 
> Visit us at http://www.colorcon.com
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