[Snort-users] Snort on proxy (outbound alerts)

Jason Wallace jason.r.wallace at ...11827...
Fri Jan 18 14:18:48 EST 2013


It does, but it is a pain in the ass to use most of the time because:
1) it isn't well supported by front ends or by SIEMs and 2) any checks
on cached content result in XFF being set to 127.0.0.1.

On Fri, Jan 18, 2013 at 2:11 PM, Joel Esler <jesler at ...1935...> wrote:
> Snort supports the logging of internal IPs if your proxy supports
> "X-Forwarded-For" or "True-Client-IP" headers:
>
> http://manual.snort.org/node255.html
>
> (enable_xff)
>
>
> --
> Joel Esler
> Senior Research Engineer, VRT
> OpenSource Community Manager
> Sourcefire
>
> On Jan 18, 2013, at 1:58 PM, Jason Wallace <jason.r.wallace at ...11827...>
> wrote:
>
> I have a similar situation, a proxy with a single NIC. While my sensor
> is inline with this NIC, I prefer to only inspect the traffic between
> the client and the proxy, and not the proxy to outside. This is the
> BPF I use.
>
> (src net 10.0.0.0/8 or src net 192.168.0.0/16 or src net
> 172.16.0.0/12) and (dst net <proxy #1 IP>/32 or dst net <proxy #2
> IP>/32) or (src net <proxy #1 IP>/32 or src net <proxy #2 IP>/32) and
> (dst net 10.0.0.0/8 or dst net 192.168.0.0/16 or dst net
> 172.16.0.0/12)
>
> Thx,
> Wally
>
> On Fri, Jan 18, 2013 at 12:34 PM, waldo kitty <wkitty42 at ...14940...>
> wrote:
>
> On 1/18/2013 06:50, J. H wrote:
>
> Hi,
>
> Thank you for answering.
>
> Only one interface on my proxy machine.
>
> SQUID/Snort listenin on the same one.
>
>
> some might consider that to be part of the problem... it sounds like what
> you
> want is for snort to be listening only to your internal machines... you
> might be
> able to use a bpf to block out alerts concerning your proxy...
>
>
>
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