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RE: Deny access to copy files
From: Craig Wright <Craig.Wright () bdo com au>
Date: Tue, 3 Jun 2008 09:20:35 +1000

So add an extra layer of risk? With no gain? Why?

VMs are not a security device (as much as people like to believe this). The locking down of the VM is the same process 
as locking down the host, but now you also have a hypervisor layer to be concerned over.

Dr Craig Wright GSE LLM

Craig Wright
Manager, Risk Advisory Services

Direct : +61 2 9286 5497
Craig.Wright () bdo com au
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-----Original Message-----

From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On Behalf Of Yahsodhan Deshpande
Sent: Tuesday, 3 June 2008 7:29 AM
To: Adam Pal; Ahmed Khalid
Cc: focus-ms () securityfocus com; security-basics () lists securityfocus com
Subject: RE: Deny access to copy files

Hi Ahmed,
   How about creating a virtual machine (which is hardened enough), and
then allow the access to the code only via the virtual machine.

   Hardening the VM would be a task in itself, but it would solve much
of the issues related to USB and mass storage devices.


-----Original Message-----
From: listbounce () securityfocus com [mailto:listbounce () securityfocus com]
On Behalf Of Adam Pal
Sent: Monday, June 02, 2008 1:15 PM
To: Ahmed Khalid
Cc: focus-ms () securityfocus com; security-basics () lists securityfocus com
Subject: Re: Deny access to copy files

Hello Ahmed,

Sounds more like you try washing your hands without getting wet :)
I can hardly imagine, that the programmers should be able to read but
not to copy, so if they need to programm they need access to the code.
I think its more frustrating for programmers to know that they have to
work with "handcuffs".
I think the problem lies much deeper :
do you trust your programmers?
If not, hire another, if yes, no such measurements needed, or better
say not more than written agreements about security policy.
About blocking web access:
As i can remember that one of the core problems of security is that
you cannot protect your data efficiently from attackers within the
I can remember about agreements which contain things like:
-not connecting mobile storage devices to the workstation (this can be
-not connecting mobile devices to the internal network (this can also
be monitored)
-not taking parts of code out of the company (which can also be

Of course, bad-intentioned people will be able to bypass such
agreements but i preffer to assume that in your staff are good people
One more - what about using interfaces for programming? Doing so,
every one holds only a small, unusable piece of the "puzzle".

Best regards,
 Adam Pal

Sunday, June 1, 2008, 8:20:25 PM, you wrote:

<==============Original message text===============
AK> I am working for a software house, they are developing a software
AK> and their requirement is to restrict programmers to take the code
out of
AK> office premises due to company policy. I am trying to configure a
AK> based machine which denies access to copy files to external storage
AK> connected to USB. There is an NTFS permission "Read + Execute" I
guess this
AK> could do the work but is there any other way to do it?

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

AK> Any help would be highly appreciated.

AK> Regards,
AK> Ahmed Khalid

<===========End of original message text===========

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