Re: Writing custom rule for SSL 401 errors

[Jason Brvenik <security () brvenik com>]

A clarification, I should have said it is encrypted using SSL and _should_ be
different for every session if properly implemented. I did not intend to imply
that all encryption was dynamic.

That being said, I have solved this problem in the past with reverse proxies or
accelerators. Unfortunately, I just got done checking the docs for my favorite
open source proxy and see that it does not support SSL in a reverse proxy mode.

There are other options though.
1) An accellerator. Not cheap.
2) Commercial proxies. Not Cheap
3) An open source proxy that does support it. ( If you find one please forward
the info to me)
4) maybe mod_proxy with apache?
6) stunnel

I know you can do it with stunnel so try it this way for a low budget option
get stunnel at http://www.stunnel.org
read the docs

set it up for realip:443 connecting to localhost:80 and have snort listen on the
loopback. or use a closed net between an stunnel host and the web server.

HTH
Jason.



"Dan Mahoney, System Admin" wrote:

> 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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> --
>
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>
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>
> --------Dan Mahoney--------
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