WebApp Sec mailing list archives
RE: Web app based on .net - best practice?
From: "Harbar, Spencer" <spencer.harbar () dns co uk>
Date: Thu, 24 Apr 2003 10:24:57 +0100
you definitely want to put your business logic on a different subnet seperated by a firewall... you could check out the Microsoft prescriptive guidance for ASP.NET: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetsec/html/secnetlpMSDN.asp This has extensive coverage of the areas you mention. It is possible to configure DCOM/COM+ to use one RPC port per application, in addition to 135. This gives you a practical and measurable way to let RPC through firewalls. Check out http://www.gotdotnet.com/team/rojacobs/samples/dev359.zip for sample code for this. However, if you are using .NET why not use Web Services and therefore HTTP as the inter-zone communication channel? Or are you restricted by windows 2000 / legacy COM components? With Windows 2003 Server you can expose legacy COM+ applications as Web Services simply by checking a box in the COM+ GUI. hth Spence -----Original Message----- From: Mads Rasmussen [mailto:mads () opencs com br] Sent: 23 April 2003 14:42 To: webappsec () securityfocus com 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/ ********************************************************************** We are exhibiting at InfoSecurity Europe 2003, Olympia - Tuesday 29th April to Thursday 1st May. Come and see us on Stand 670 (with Microsoft) where we will be discussing Application Security. ********************************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the sender immediately and then delete from your system. This footnote also confirms that this email message has been swept for the presence of known computer viruses. **********************************************************************
Current thread:
- Web app based on .net - best practice? Mads Rasmussen (Apr 23)
- RE: Web app based on .net - best practice? Dennis Hurst (Apr 23)
- Re: Web app based on .net - best practice? Alex Russell (Apr 23)
- RE: Web app based on .net - best practice? TUER, DON (Apr 23)
- RE: Web app based on .net - best practice? Shaji Sethu (Apr 23)
- <Possible follow-ups>
- RE: Web app based on .net - best practice? Calderon, Juan C (CORP, DDEMESIS) (Apr 23)
- RE: Web app based on .net - best practice? Harbar, Spencer (Apr 24)