[cifs-protocol] MS-SMB2/MS-FSA: setting SD inherited ACL flag "... - TrackingID#2105100040001378
HungChun.Yu at microsoft.com
Mon May 10 08:14:25 UTC 2021
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From: Ralph Boehme <slow at samba.org>
Sent: Monday, May 10, 2021 12:34 AM
To: Interoperability Documentation Help <dochelp at microsoft.com>
Cc: cifs-protocol at lists.samba.org
Subject: [EXTERNAL] MS-SMB2/MS-FSA: setting SD inherited ACL flag "DACL Auto-Inherited" (DI)
I've noticed that a wellknown behaviour with regards to ACL control flags semantics seems to be undocumented. At least, I couldn't find any reference that would explain the behaviour of a Windows SMB server.
Fwiw, Samba implements the same behaviour since many many years.
What I'm observing is that when setting an SD on a file or directory, the resulting value of the flag "DACL Auto-Inherited" (DI) depends on the values of both "DACL Auto-Inherited" (DI) and DACL Computed Inheritance Required (DC).
Only if DI and DC are set in the client SD, the resulting SD will have DI.
Following along MS-SMB2 and MS-FSA I can only find the following applicable sections:
MS-SMB2 184.108.40.206.3 Handling SMB2_0_INFO_SECURITY
7. The server MUST call into the underlying object store to set
the security on the object.<377>
<377> Section 220.127.116.11.3: Windows performs SMB2 SET_INFO
SMB2_0_INFO_SECURITY processing via Server Requests Setting
of Security Information [MS-FSA] section 18.104.22.168.
MS-FSA 22.214.171.124 Server Requests Setting of Security Information
"... . The object store MUST set Open.File.SecurityDescriptor
I'm reading this as "the object store must store the unmodified SD received from the client ".
Can you please check if the observed behaviour is indeed missing from the documentation and should be added?
Ralph Boehme, Samba Team https://samba.org/
Samba Developer, SerNet GmbH https://sernet.de/en/samba/
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