Re: Writing custom rule for SSL 401 errors

["Dan Mahoney, System Admin" <danm () prime gushi org>]

On Tue, 13 Aug 2002, Jason wrote:

> it is encrypted and as a result will be different every time. The only
> to catch the actual content would be to front end the system and have
> snort see the clear traffic.

Well, hrmm, here's a thought, but it's ugly.  Have apache log to "tee",
and pipe that over a symmetrically encrypted tunnel with netcat to
anywhere on the lan and monitor that.  (or for that matter, an
asymmetrically encrypted tunnel to your sniffer)

I said it was ugly.

But it's the first thing I can come up with off the top of my head.

-Dan

> Jason
>
> Hicks, John wrote:
>
> > why not just sniff the traffic on a session you create?
> >
> > -----Original Message-----
> > From: Eric Joe [mailto:sysop () tje1 com]
> > Sent: Tuesday, August 13, 2002 2:24 PM
> > To: snort-users () lists sourceforge net
> > Subject: [Snort-users] Writing custom rule for SSL 401 errors
> >
> >
> > Hello,
> > I am trying to write a snort rule that sends an alert when someone gets a
> > 401 "Authorization Required" error while using SSL. I have the non-SSL
> > rule working as such
> > alert tcp $HTTP_SERVERS $HTTP_PORTS -> $EXTERNAL_NET any (msg:"ATTACK
> > RESPONSES Http Failed Authorization"; content: "HTTP/1.\
> > 1 401 "; flags:A+; classtype:bad-unknown; sid:1000001; rev:1;)
> >
> > It works fine, but with SSL encryption I am having trouble with the
> > "content" parameter. I guess if I knew what HTTP/1.1 401  looked like when
> > its encrypted, it would be a piece of cake.
> > Anyone have any insight on this?  Thanks in advance.
>
>
>
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--------Dan Mahoney--------
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