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RE: Deny access to copy files
From: Craig Wright <Craig.Wright () bdo com au>
Date: Tue, 3 Jun 2008 09:15:34 +1000


Trust but verify.

Good employment contracts, monitor use and access. Log and validate email. Us an IDS with code functions as search 
matches...

A good contract will let you stop most code that leaks as the company it goes to can be estopped from making use of it. 
Make receipt of the code a big enough risk on its own.

Regards,
Dr. Craig Wright GSE LLM


Craig Wright
Manager, Risk Advisory Services

Direct : +61 2 9286 5497
Craig.Wright () bdo com au
+61 417 683 914

BDO Kendalls (NSW-VIC) Pty. Ltd.
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GPO BOX 2551 Sydney NSW 2001
Fax +61 2 9993 9497
http://www.bdo.com.au/

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-----Original Message-----

From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On Behalf Of Ansgar -59cobalt- Wiechers
Sent: Tuesday, 3 June 2008 2:44 AM
To: security-basics () securityfocus com
Subject: Re: Deny access to copy files

On 2008-06-01 Ahmed Khalid wrote:
I am working for a software house, they are developing a software
product and their requirement is to restrict programmers to take the
code out of office premises due to company policy. I am trying to
configure a windows based machine which denies access to copy files to
external storage devices connected to USB. There is an NTFS permission
"Read + Execute" I guess this could do the work but is there any other
way to do it?

They also don't need programmers to take the code with them in their
email. I can restrict SMTP and POP ports but when it comes to web
based emails I am clueless, How can I restrict web based emails like
hotmail, gmail, yahoo there are so many of these and if I somehow
manage to block all web based email sites someone can write a script
to send emails, if not a script HTTP tunneling would bypass any checks
and bounds defined by my proxy/gateway machine. How can I block such
thing?

Any help would be highly appreciated.

If you can't trust your developers: fire them. Trying to restrict them
by enforcing policies is pointless. If they're unable to thwart whatever
measure you throw at them either their environment is too ristrictive
for them to be able to work efficiently (which is counter-productive for
the company), or they're incompetent (in which case you may want to find
someone better).

Regards
Ansgar Wiechers
--
"All vulnerabilities deserve a public fear period prior to patches
becoming available."
--Jason Coombs on Bugtraq
eloplEs???


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