[cifs-protocol] [120012821001754][MS-SFU]Clarification request on cross-realm RBCD in MS-SFU 3.2.5.2.2

[Sreekanth Nadendla]

Hello Isaac, we will update the spec to indicate that in the RBCD scenario, Kdc reply will set the cname and crealm using the impersonated client principal name constructed from the PAC.

Regards,
Sreekanth Nadendla
Microsoft Windows Open Specifications

From: Sreekanth Nadendla
Sent: Tuesday, January 28, 2020 4:07 PM
To: Isaac Boukris <iboukris at gmail.com>
Cc: support <support at mail.support.microsoft.com>; Greg Hudson <ghudson at mit.edu>; cifs-protocol at lists.samba.org
Subject: RE: [120012821001754][MS-SFU]Clarification request on cross-realm RBCD in MS-SFU 3.2.5.2.2

Hello Isaac, I’m researching this issue for you. I will provide you with an update as soon as I have some details to share with you.


Regards,
Sreekanth Nadendla
Microsoft Windows Open Specifications


From: Hung-Chun Yu <HungChun.Yu at microsoft.com<mailto:HungChun.Yu at microsoft.com>>
Sent: Tuesday, January 28, 2020 11:22 AM
To: Isaac Boukris <iboukris at gmail.com<mailto:iboukris at gmail.com>>
Cc: support <support at mail.support.microsoft.com<mailto:support at mail.support.microsoft.com>>; Greg Hudson <ghudson at mit.edu<mailto:ghudson at mit.edu>>; cifs-protocol at lists.samba.org<mailto:cifs-protocol at lists.samba.org>
Subject: [120012821001754][MS-SFU]Clarification request on cross-realm RBCD in MS-SFU 3.2.5.2.2

+support [cc]
-dochelp [bcc]

Hi Isaac

Thank you for your question.  We created SR 120012821001754 and please leave this info in the subject line to track your issue.  An engineer will contact you soon.
​
Hung-Chun Yu​
Microsoft Protocols Support​

________________________________
From: Isaac Boukris <iboukris at gmail.com<mailto:iboukris at gmail.com>>
Sent: Tuesday, January 28, 2020 5:30 AM
To: Interoperability Documentation Help <dochelp at microsoft.com<mailto:dochelp at microsoft.com>>; Greg Hudson <ghudson at mit.edu<mailto:ghudson at mit.edu>>; cifs-protocol at lists.samba.org<mailto:cifs-protocol at lists.samba.org> <cifs-protocol at lists.samba.org<mailto:cifs-protocol at lists.samba.org>>
Subject: [EXTERNAL] Re: Clarification request on cross-realm RBCD in MS-SFU 3.2.5.2.2

Hi again,

On Sun, Jan 26, 2020 at 1:57 PM Isaac Boukris <iboukris at gmail.com<mailto:iboukris at gmail.com>> wrote:
>
> When a KDC replies with Service Ticket (MS-SFU 3.2.5.2.2), how does it
> determine the reply cname and crealm.
>
> https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fopenspecs%2Fwindows_protocols%2Fms-sfu%2Fce6bbf34-0f11-40d6-93d1-165a3afa0223&data=02%7C01%7CHungChun.Yu%40microsoft.com%7C3a83b03cfab04f57ca3a08d7a3f680de%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637158151428246386&sdata=MjRHU0UvvE9zuzJqoQGt%2FeQECFo8xwNs9KU9DvuYNuQ%3D&reserved=0<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fopenspecs%2Fwindows_protocols%2Fms-sfu%2Fce6bbf34-0f11-40d6-93d1-165a3afa0223&data=02%7C01%7Csrenaden%40microsoft.com%7C85935b52f45841af7f0608d7a4278fd0%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637158362130403984&sdata=nKrdFdaAXXCP8x4zrZth4PVd8YQ6nJ8%2BalPZXd2pw6U%3D&reserved=0>
>
> Per the above doc, it sounds like it should be the cname and crealm
> from the additional-ticket, however in RBCD, when the
> additional-ticket is a cross-tgt the cname and cream are of service-1
> and not of the impersonated client.
>
> In contrast, I've observed that Windows KDC constructs the
> impersonated client's principal name from the PAC, and set the reply
> cname and crealm to that principal's. However, I can't find any clear
> document that reflects it.

I've sent this over the weekend, and perhaps got lost.

In short, I think MS-SFU 3.2.5.2.2 section was not updated for
cross-realm RBCD, as other parts of the document. Please review and
assign :)
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