Re: Re: Request for Comments: Pledge fund for multicore support

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On Thu, Sep 18, 2008 at 04:55:35AM +0200, Jan Reusch wrote:
> hi there
> 
> Arno Wagner schrieb:
> > On Wed, Sep 17, 2008 at 04:29:36PM -0500, Clayton Shepard wrote:
> >> It sounds like it may be more effective, and much less code, to write
> a well
> >> scripted front end that manages and automates the creation and opening of
> >> multiple LUKS devices at once.
> >
> > I agree. In addition this can be done by anybody competent, as it does
> > not need insights into the LUKS implementation.
> at this point you have to be very careful.
> one reason christophe initially switched vom a scripted cryptsetup to
> a c implementation was that he could reliably erase the memory region
> the password was stored in.

That is where the "competent" comes in. Ordinary programming
skills are not enough, an understanding of security is needed.

However, quite frankly, the cipher set-up is the kernel memory
anyways, and said "competents" can use it to decryopt a 
LUKS partition. AFAIK, nothing in kernel memory is protected
from root. 

Still a good idea to do, as a non-overwritten key/passphrase 
can stay in memory a long time after an encrypted partition 
has been umounted.
 
> some time ago there was a request to implement this behavior into
> cryptsetup, it shouldn't be to hard to split the parameters and place
> the while() into the right area.

wuld require a different input mode though. Maybe a file/stdinput 
that lists a set of PGP/GnuPG protected keyfiles and the associated 
partitions? 

Arno
- -- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@xxxxxxxxxxx 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
- ----
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier 
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