What is PCNS?

Andrew Bartlett abartlet at samba.org
Tue Apr 5 22:35:59 GMT 2005

On Tue, 2005-04-05 at 16:42 -0500, Christopher R. Hertel wrote:
> On Tue, Apr 05, 2005 at 04:20:53PM -0500, Gerald (Jerry) Carter wrote:
> > Hash: SHA1
> > 
> > Christopher R. Hertel wrote:
> > 
> > | At the core of the question is whether or not it's possible
> > | to get hold of the plaintext password if you are the DC.
> > | If so, then you could also update the Unix password
> > | and whatever else needed updating.
> > 
> > how do you think we support 'unix password sync' ?
> Wasn't sure, which is why I asked.
> > The client sends the cleartext of the new password
> > encrypted with the has of the old password like Richard
> > mentioned in a previous mail.
> Is this true for Win9x-vintage clients or is it only true if they're 
> RPC-capable?

It is true for almost all clients, except those which make a LM hash
only password change.

See the Samba4 IDL for the variations on the theme at the SAMR layer,
but in practice, we have not had any issues with being able to get
plaintext passwords, except for *machine* password changes in Samba3,
where we don't know how to handle ServerPasswordSet2.  (4 recently got
the IDL and implementation for this call, but I don't know what clients
use it).

Andrew Bartlett
Andrew Bartlett                                http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org
Student Network Administrator, Hawker College  http://hawkerc.net
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