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RE: Deny access to copy files
From: "Mason, Samuel" <SMason () mt gov>
Date: Mon, 9 Jun 2008 07:39:42 -0600

I haven't reached the bottom of this thread so I apologize if this is repeat info.

If you have AD or some sort of management software that can push registry changes you can try these:

Turn off CD Burners:
REG ADD "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoCDBurning /t REG_DWORD /d 00000001 /f

Turn off USB Mass Storage:
REG ADD "HKLM\System\CurrentControlSet\Services\UsbStor" /v Start /t REG_DWORD /d 00000004 /f

Turn USB Mass Storage to Read-Only:
REG ADD "HKLM\System\CurrentControlSet\Control\StorageDevicePolicies" /v WriteProtect /t REG_DWORD /d 00000001 /f

The CD Burner option only works with the built-in burning function of Windows. You'd have to make sure the systems also 
did not have burning software.

All of these tricks will, of course, do you absolutely no good if the developers are savvy and have more than standard 
user rights or you can't enforce these changes via GP with consistency.

As far as web mail goes I'd suggest some filtering software to get the majority of the webmail sites if that's 
important. They aren't perfect.

In your situation a strong and well-enforced policy (with actual consequences for not following) might get you further 
than some of these mechanisms. There are a lot of ways around what you're trying to do .

Samuel Mason, CISSP

-----Original Message-----
From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On Behalf Of Ahmed Khalid
Sent: Sunday, June 01, 2008 12:20 PM
To: focus-ms () securityfocus com
Cc: security-basics () lists securityfocus com
Subject: Deny access to copy files

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.

Ahmed Khalid

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