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

["Shaji Sethu" <ssethu () micros com>]

Hi,
Recently Microsoft participated in eweeks OpenHack comp. You can read up on
how they setup the network and various details that were adopted. Some of
them seam to be a bit draconian and would be a bit hard to implement in a
working production environment. Still it is a good pointer on how to do it.
Have a look.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetsec/ht
ml/openhack.asp

With .Net have a look at remoting as well. Web Services are a good interface
to the outside world but inter app coms can be slow, binary remoting with
Object Serialization is much faster.

Regards.
 
Shaji Sethu
System Developer
Micros Fidelio 


-----Original Message-----
From: Mads Rasmussen [mailto:mads () opencs com br] 
Sent: 2003-04-23 11:42 PM
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/