RE: Avoiding tunnels

["David Gillett" <gillettdavid () fhda edu>]

  Blue Coat's new "SG" appliance line are SSL proxies (with 
hardware assist); one of their intended uses is as an SSL
Man-in-the-Middle to catch stuff trying to sneak in over 443.
(They already did 80 without the encryption hardware.)
  [They retain full proxy server functionality, or can be
used as a reverse proxy/SSL accelerator in front of your
servers, too.]

David Gillett
 

> -----Original Message-----
> From: Javier Hijas [mailto:jhijas () germinus com] 
> Sent: Thursday, March 02, 2006 3:51 AM
> To: security-basics () securityfocus com
> Subject: Re: Avoiding tunnels
>
> Thanks all, It's clear that to inspect http protocol I need 
> an application level firewall. I know about netfilter add-ons 
> and comercial firewalls like ISA and checkpoint (with 
> "application intelligence" ;-) implementing this osi level 
> inspection, but I see no way to check ssl
> traffic: opening navigation traffic for users means opening 
> at least 80 and 443 ports. I can open a ssh tunel troght 443 
> port even with "ssl inspection".
>
> Access lists has no reason to be implemented when you deal 
> with "shrewd"
> users?
>
>
> Ansgar -59cobalt- Wiechers wrote:
> > On 2006-02-28 Javier Hijas wrote:
> >
> > >  I wonder if there is a way to avoid tunnels via fw (v.g. 
> netfilter).
> > > How can I control that an opened port 80 is not used to 
> tunel to a ssh 
> > > server listening at port 80?
> >
> >
> > You need to filter on layer 7 instead of layer 3/4, e.g. by 
> proxying 
> > the traffic.
> >
> > Regards
> > Ansgar Wiechers
>
>
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EARN A MASTER OF SCIENCE IN INFORMATION ASSURANCE - ONLINE
The Norwich University program offers unparalleled Infosec management 
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Tailor your education to your own professional goals with degree 
customizations including Emergency Management, Business Continuity Planning, 
Computer Emergency Response Teams, and Digital Investigations. 

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