[cifs-protocol] [EXTERNAL] [MS-KILE] Authentication Policies and RODCs - TrackingID#2310190040000616
Jeff McCashland (He/him)
jeffm at microsoft.com
Thu Oct 19 01:52:21 UTC 2023
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Jeff McCashland (He/him) | Senior Escalation Engineer | Microsoft Protocol Open Specifications Team
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From: Joseph Sutton <jsutton at samba.org>
Sent: Wednesday, October 18, 2023 6:44 PM
To: cifs-protocol at lists.samba.org; Interoperability Documentation Help <dochelp at microsoft.com>
Subject: [EXTERNAL] [MS-KILE] Authentication Policies and RODCs
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[MS-KILE] 126.96.36.199, “TGS Exchange”, states that if during a TGS Exchange an Authentication Policy with ‘AllowedToAuthenticateTo’ is in effect, the user and device PACs must be used to perform an access check: if the access check succeeds, a service ticket is issued to the client; if it fails, the KDC returns KDC_ERR_POLICY.
However, I have found that Windows Server 2019, acting as a RWDC,
*always* returns KDC_ERR_POLICY if the client’s TGT presented to the KDC has been issued by an RODC.
If no ‘AllowedToAuthenticateTo’ policy is enforced, or the client’s TGT has been issued by a RWDC, the TGS‐REQ exchange is successful.
As far as I can tell, this behaviour — disallowing the combination of authentication policies and RODC‐issued tickets — is not documented anywhere. Is matching this behaviour important for the correct and secure operation of MS-KILE implementations? and if so, can it be clearly documented in [MS-KILE]?
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