[cifs-protocol] [REG:210063056197932001] Need some clarification on the User-Change-Password access rights

[Bill Wesse]

Good morning Nadya – Bill Wesse here; Obaid is out of the office, and I will be your contact for this case.

Could you send me a network capture of the CONSTRAINT_VIOLATION error you are receiving? Thanks in advance; this will help us in making sure we get things right!

Regards,
Bill Wesse
MCSE, MCTS / Senior Escalation Engineer, US-CSS DSC Protocol Team
8055 Microsoft Way
Charlotte, NC 28273
Email:   billwe at microsoft.com<mailto:billwe at microsoft.com>
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From: Bill Wesse
Sent: Friday, July 16, 2010 9:48 AM
To: "nivanova at samba.org" <nivanova at samba.org>
Cc: "cifs-protocol at samba.org" <cifs-protocol at samba.org>; "MSSolve Case Email" <casemail at microsoft.com>
Subject: [REG:210063056197932001] Need some clarification on the User-Change-Password access rights

Hi Nadya:
Thank you for clarification. I’ll get back to you as soon as I have an answer.

Regards,
Obaid Farooqi
Sr. Support Escalation Engineer | Microsoft

From: didrash at gmail.com [mailto:didrash at gmail.com] On Behalf Of Nadezhda Ivanova
Sent: Tuesday, July 06, 2010 10:58 AM
To: Obaid Farooqi
Cc: cifs-protocol at samba.org; MSSolve Case Email
Subject: Re: [REG:210063056197932001] Need some clarification on the User-Change-Password access rights

Hi Obaid,
I am looking at:
5.1.3.3.4 Checking Control Access Right-Based Access and 2.5.4.1 Access Check Algorithm Pseudocode
In the access check algorithms, every time an access check is failed, insufficient access is returned, I did not see an instance of constraint violation. In 5.1.3.3.4, it is mentioned that in this and this case we deny the requested access, which leads me to believe insufficient access is returned. If constraint violation is the correct response for particular case, I think we definitely need some disambiguation on a per Control Access Right basis...

Regards,
Nadya
On Tue, Jul 6, 2010 at 6:44 PM, Obaid Farooqi <obaidf at microsoft.com<mailto:obaidf at microsoft.com>> wrote:
Hi Nadya:
Please let me know according to which document you should receive INSUFFICIENT_ACCESS_RIGHTS.

Regards,
Obaid Farooqi
Sr. Support Escalation Engineer | Microsoft

From: Obaid Farooqi
Sent: Thursday, July 01, 2010 10:22 AM
To: 'nivanova at samba.org<mailto:nivanova at samba.org>'
Cc: cifs-protocol at samba.org<mailto:cifs-protocol at samba.org>; MSSolve Case Email
Subject: RE:[REG:210063056197932001] Need some clarification on the User-Change-Password access rights

Hi  Nadya:
My name is Obaid Farooqi and I’ll be helping you with this issue. I’ll be in touch as soon as I have anything concrete. Please feel free to contact me if you have a question/clarification.

Regards,
Obaid Farooqi
Sr. Support Escalation Engineer | Microsoft

From: didrash at gmail.com<mailto:didrash at gmail.com> [mailto:didrash at gmail.com<mailto:didrash at gmail.com>] On Behalf Of Nadezhda Ivanova
Sent: Wednesday, June 30, 2010 6:31 AM
To: Interoperability Documentation Help; cifs-protocol at samba.org<mailto:cifs-protocol at samba.org>
Subject: Need some clarification on the User-Change-Password access rights

Hello,
I am currently working on enforcing the User-Change-Password control access right on password change operations in Samba 4, and there are a few things that puzzle me, perhaps you could help. I am testing agains a Win2008 server, domain and forest functional levels are 2008.

The user object class has the following ACE in the defaultSecurityDescriptor:
(OA;;CR;ab721a53-1e2f-11d0-9819-00aa0040529b;;WD), OA;;CR;ab721a53-1e2f-11d0-9819-00aa0040529b;;PS)
I created a user and removed these two for the purposes of negative testing. However, when I performed a password change operation(delete and add of unicodePwd), I got CONSTRAINT_VIOLATION error rather than INSUFFICIENT_ACCESS_RIGHTS. I granted the user write property access, but the result was the same.
Alternatively, a user to whom I explicitly denied WP access was able to change their password if they have User-Change-Password.
So my question is:
Is the write access to unicodePwd controlled only by User-Change-Password, and WP is disregarded in this case?
Why is the error returned CONSTRAINT_VIOLATION?

Also, given that by default we this control access right is granted to EVERYONE, this means that the actual line of defence is the changer knowing the original password. If they know the password, it does not matter which account changes the user's password, which makes sense. However, in this case, why bother with checking User-Change-Password at all? It appears that its purpose is to allow a user (or any account for that matter) to change the password even if they do not have WP access on themselves, am I correct?

Best Regards,
Nadya

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