On Thu, Aug 26, 2010 at 1:19 PM, Andrew S. Baker <[email protected]> wrote:
> The client is not the one that does password policy enforcement normally.
> It is the DC that does it, which is why it's done at the time the password is 
> changed.
> Currently, the client is not even aware of what the policy is for passwords.
> This would be quite a bit of change, and not necessarily trivial.

  I'm pretty sure you're at least partly incorrect on this.  Domain
members are aware of domain password policy.  It's published via Group
Policy -- often the "Default Domain Policy" which applies to all
computers.  More significantly, when a domain password policy is
applied, then even machine-local accounts on domain members are
required to meet password policy when  changing the password.  So
domain members can and do enforce domain password policy currently.

  Whether or not DCs also check new passwords against policy (in case
the client does not for whatever reason), I don't know.

  (Technically speaking, I think it might be theoretically possible
that the DC does not even need  to ever see the cleartext password.
The domain member might hash it and then send the hash to the DC.  But
given the option to store cleartext passwords on the DC, I would guess
the client always sends the cleartext (otherwise, it would need to be
a negotiated protocol option, which seems unlikely).  But I digress.)

-- Ben

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