RE: Web app based on .net - best practice?

["Dennis Hurst" <dhurst () spidynamics com>]

Mads,

Microsoft has a pretty good set of documentation that answers a lot of
the questions your looking for.  I haven't read 100% of it so I can't
give an opinion yet but here is the link:
        
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetse
c/html/secnetlpMSDN.asp?frame=true

Hope it helps.

Have a great day,
 
Dennis Hurst
dhurst () spidynamics com
SPI Labs
 


-----Original Message-----
From: Mads Rasmussen [mailto:mads () opencs com br] 
Sent: Wednesday, April 23, 2003 9:42 AM
To: webappsec () securityfocus com
Subject: Web app based on .net - best practice?



Imagine I have a .net based application

I thought it would be a good idea to have the presentation layer (asp)
in a DMZ and the business layer (components in VB and C#) in a safe site
behind a firewall. The communication in between would take place with
RPC calls. 
I know that RPC is not considered secure but we have a firewall in
between the DMZ and the safe site (not a guarantee things work out, I
know)

I wondered what Microsoft says about the division of the layers, is
there a recommendation or some kind of best practice for something like
this?

Do any know of pointers to information about this? 

My concern is that if the whole application was based in the DMZ, it
would be hard to control injections and stuff like that. With the
division we can control (somewhat) what calls goes to the safe site
(business layer).

I would love to hear opinions on this matter

Thanks,

Mads

--
Mads Rasmussen
Consultant
Av. Engenheiro Luis Carlos Berrini, 550
11º. Andar - conj. 111 - Brooklin - S.P. Brasil
+55 11 3345-2525 Phone
+55 11 3345-2526 Fax
http://www.opencs.com.br/