Firewall Wizards mailing list archives
RE: Sources for Extranet Designs?
From: "Mitchell Rowton" <mrowton () bdo com>
Date: Mon, 23 Feb 2004 15:33:35 -0500
I *think* this depends on what you tell your customers when they sign on. If they signed an access form that says "yada yada, we are not responsible for security" then it doesn't seem like you would be liable at all. Providing that you attempt to provide reasonable security measures. What is reasonable is up to lawyers, judges and such. But I would think that if you had a extranet policy and connection agreement (see link) you would be fairly safe with a good attorney. http://www.securitydocs.com/links/detail/345 I (and most of you) would also consider having a firewall to enforce the security controls outlined in your policy to be reasonable. But how much money to you spend to secure customers from other customers? Mitchell
"Bob Alberti" <alberti () sanction net> 02/23/04 03:08PM >>>
One thing I always wonder about in Extranet designs: how liable are you (the host of the Extranet) if two of your Extranet customers are competitors? If Customer A can hack your Extranet to, for instance, inspect Customer B's orders, or even to hack Customer B's network, how liable are you for not providing a more secure Extranet environment? Its one thing to protect the host organization from Extranet clients: its another entirely to protect clients from each other. -----Original Message----- From: firewall-wizards-admin () honor icsalabs com [mailto:firewall-wizards-admin () honor icsalabs com]On Behalf Of Wes Noonan Sent: Monday, February 23, 2004 1:31 PM To: 'Baumann, Sean C.'; 'R. DuFresne' Cc: 'Paul Robertson'; firewall-wizards () honor icsalabs com Subject: RE: [fw-wiz] Sources for Extranet Designs?
1.) If you say you should never allow access to resources on your protected or internal network, how do you handle giving access to services that reside on machines that cannot be duplicated (i.e. expensive mainframes)?
There are a couple of approaches that I can think of off hand. Approach 1 is to design the services with extranet connections in mind. Simply put, maybe the mainframe isn't the right place to house that resource. This is probably not the answer that you want to hear though. Approach 2 is to accept that you have a business limitation that is going to force you to implement a less than ideal security solution. At that point, you mitigate it. What precise ports need to be opened from the extranet to the internal resource and grant *only* that access. If they need SQL access but not NFS access then make sure that your firewall only permits SQL traffic to pass between the two networks. Things like that.
2.) Do most companies require routable address on their extranet? Currently we use RFC1918 address for our extranet, but we see that
this
will become a problem in the future as we add partners.
Depends. Assuming that you are going to be using firewalls and advertising your internal resources as something else (through the use of NAT, etc.) then you can do that and make the routable addresses what the extranet partners think they are going to connect with. That being said, you can pretty much pick any RFC1918 address space at that point and use it in a similar fashion. The obvious alternative is that someone will need to change their address space. More detailed design you will probably have to pay me for. :-) One thing that this scenario really graphically depicts is why separation of resources is such a valuable objective. Sure, it sounds really nice to have all your stuff running on a mainframe running Linux hosts but these are the kinds of security problems you will then run into. (feel free to expand this statement as you see fit - i.e. integrated firewall/ids/content filter/spam control/virus scanning or separate switches vs. VLANs). HTH Wes Noonan mailinglists () wjnconsulting com http://www.wjnconsulting.com Hardening Network Infrastructure - A concise how to guide Available Spring 2004 Order at http://tinyurl.com/2nof4 _______________________________________________ firewall-wizards mailing list firewall-wizards () honor icsalabs com http://honor.icsalabs.com/mailman/listinfo/firewall-wizards _______________________________________________ firewall-wizards mailing list firewall-wizards () honor icsalabs com http://honor.icsalabs.com/mailman/listinfo/firewall-wizards NOTICE: The contents of this email and any attachments to it may contain privileged and confidential information from BDO Seidman, LLP. This information is only for the viewing or use of the intended recipient. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or use of, or the taking of any action in reliance upon, the information contained in this e-mail, or any of the attachments to this e-mail, is strictly prohibited and that this e-mail and all of the attachments to this e-mail, if any, must be immediately returned to BDO Seidman, LLP or destroyed and, in either case, this e-mail and all attachments to this e-mail must be immediately deleted from your computer without making any copies thereof. If you have received this e-mail in error, please notify BDO Seidman, LLP by e-mail immediately. _______________________________________________ firewall-wizards mailing list firewall-wizards () honor icsalabs com http://honor.icsalabs.com/mailman/listinfo/firewall-wizards
Current thread:
- RE: Sources for Extranet Designs?, (continued)
- RE: Sources for Extranet Designs? Marcus J. Ranum (Feb 23)
- Re: Sources for Extranet Designs? Dragos Ruiu (Feb 23)
- Re: Sources for Extranet Designs? George Capehart (Feb 24)
- RE: Sources for Extranet Designs? Baumann, Sean C. (Feb 23)
- RE: Sources for Extranet Designs? Wes Noonan (Feb 23)
- RE: Sources for Extranet Designs? Frederick M Avolio (Feb 23)
- RE: Sources for Extranet Designs? Marcus J. Ranum (Feb 23)
- Plumbers... was Re: Sources for Extranet Designs? Gary Flynn (Feb 24)
- RE: Sources for Extranet Designs? Wes Noonan (Feb 23)
- RE: Sources for Extranet Designs? Marcus J. Ranum (Feb 23)
- RE: Sources for Extranet Designs? Jim Seymour (Feb 23)
- RE: Sources for Extranet Designs? Chris Blask (Feb 24)
- RE: IPS (was: Sources for Extranet Designs?) Ben Nagy (Feb 26)
- RE: IPS (was: Sources for Extranet Designs?) Christian Kreibich (Feb 26)
- RE: IPS (was: Sources for Extranet Designs?) Chris Blask (Feb 26)
- Re: IPS (was: Sources for Extranet Designs?) Bennett Todd (Feb 26)
- RE: IPS (was: Sources for Extranet Designs?) Frederick M Avolio (Feb 26)