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

["TUER, DON" <don.tuer () cgi com>]

Hi Mads:

Web Tier - only have web server in this tier. Build a proxy component
that sends all requests to application tier. Use SAOP as the transport
which allows for better firewall security. 

Application Tier - authenticate the user in this tier and pass back an
authentication ticket to the web tier who then renders the page if it's
an authenticated user.

A good place to start is Microsoft's report "Building Secure ASP.NET
Applications: Authentication, Authorization, and Secure Communication"

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetse
c/html/secnetlpMSDN.asp?frame=true

Thanks

Don

-----Original Message-----
From: Mads Rasmussen [mailto:mads () opencs com br] 
Sent: 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
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