[Samba] Remove all Windows ACL's from files/folders

Greg Sloop <gregs@sloop.net> gregs at sloop.net
Tue Mar 29 17:40:43 UTC 2022

Sorry for the long post;
The gist is:

1) I set permissions in the Windows UI, and it appears to be successful.
2) I then attempt to access a share, from a domain joined Windows PC, using
the user (and group) I've assigned "full control" to.
3) It Fails.
4) So, I check the Samba logs - sure enough it shows that user attempting
to access that share.
5) I check to be sure the UID matches the UID of the user. It does.
6) I check the GID and it also matches.
7) I check the NTACL perms that Samba thinks are set, and look (as best I
can understand) the SDDL output.
8) And the SDDL output doesn't even remotely match the permissions I set in

And I have no idea where to look next to figure out why.

Following is the "show my work" section. :)

So, I'm only able to set permissions (as Administrator) with
"acl_xattr:ignore system acls = yes" set.
(Which is "wrong" but lets just go with it. You'll see where I'm going in a

So, I set the permissions on a share to the following. (From the Windows
file explorer)
Allow root: full control
Allow SYSTEM: full control
Allow Domain Admins: full control
Allow: Domain Users: full control
Allow ad\gs: full control

I'm testing with a test user, AD\GS.
GS is a member of domain users, which should grant access, but doesn't.
So, I add the user explicitly, which also fails to grant access.

So, check the Samba logs.
2022/03/29 10:23:54.736440,  0]
vfs_ChDir(/abc-zfs-01/ad-shared-folders/shared-files) failed: Permission
denied. Current token: uid=11608, gid=10513, 7 groups: 11608 10513 11129
3003 3004 3006 3001
# wbinfo -i "ad\gs"

So the UID in the Samba log matches the user I expect.
That's good.
At least the user attempting access matches the user I've set permissions

Incidentally, the group matches too;
wbinfo -i "ad\domain users"
AD\domain users:*:10513:10513::/home/AD/domain users:/bin/false

So, now lets see what Samba thinks the permissions are on that

getfattr -n security.NTACL /abc-zfs-01/ad-shared-folders/shared-files/
samba-tool ntacl get /abc-zfs-01/ad-shared-folders/shared-files/ --as-sddl

And I get:

However, I'm a bit lost decoding that - but it really doesn't look like I'd
It looks to have a couple of "everyone" permissions - which isn't in the
Windows UI.
Also, there's a "Creator Owner" and "Creator Group" which aren't in the ACL
I've set in Windows. And I don't see the "Domain Users" or the explicit
User assignment in there.

(Rowland, I'd be happy for a better decode, if you can - but that's what I
think I see.)

So that would explain a lot - the permissions that Samba thinks is set on
the share/folder don't match, at all, the permissions I set from the
Windows file explorer UI.

Can someone tell me where to look next to figure out why?

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