[Samba] GPOs not Working!

L.P.H. van Belle belle at bazuin.nl
Wed Feb 7 09:01:44 UTC 2018


Ok, for the sysvol.
I'll put all steps here again. 

I suggest start with this one. 
wget https://raw.githubusercontent.com/thctlo/samba4/master/samba-check-set-sysvol.sh
This checks and set the rights to be known to be right. ( aka works great for me ) ;-) 

Then follow these steps.

- login as dom\administrator. 
- start computer manager, connect to dc.
- klik Shared Folders, Shares, sysvol. 
  Option 1, this is the default. Everyone with Full control, Change and Read.
  Option 2, Everyone: Read.
		Verified users:  Full, Change, Read.
		SYSTEM Full, Change, Read.
		DOMAIN\Adminstrators ( or DOMAIN\Domain Admins ) Full, change read.

The result of both settings are ( share wize)  the same.
Except in option2, you must be verified before you can write anywere.

- Tab Security.
		Verified users:  Read+exec, Show folder content, Read.
		SYSTEM: full ( everything on )
		DOMAIN\Adminstrators: ( or DOMAIN\Domain Admins ) full ( everything on
		DOMAIN\Serer operators: Read+exec, Show folder content, Read.
Once this is set, klik advanced, klik change below. 
Check, replace all underlying and replace.. 

! Note, always this order, first share security then folder security. 
That helps preventing making error or resetting rights. 

- Do the same for Netlogon. Same settings as sysvol, since its a sub folder of sysvol.

- These steps are imo only done once, ( ! Or if you get errors again due to a reset or change in windows clients ) 
Now first goto the GroupPolicyObjects, ( not the linked once's )
Klik on every GPO object there, if you get any message, press ok, then its reset. 

Now, you need to check the GPO Objects that are assigned/linked to OU and/or groups.

Just start in the top, and klik every object.
All my "normal" GPO Objects only have Authenticated Users.
My "special" GPO Object have different settings. 

For example, i've disabled all USB/Mobile/CD access on the pc's by GPO's 
A user policy set in the Standard User. I've created 2 groups, per type. 
For example.
USB-Read, if i look here you see only USB-Allow-Read group. Now klik the Delegation Tab.
That shows me: 
Authenticated User Ready (by security filter)
DOM\Domain Admins
DOM\Enterprise Admins
Server logon

What you dont see is the underlying ACL, klik  Advanced.
Here you see, ... The "Reset to default" button. 
Reset it. 

Now remember here, after doing this, no samba-tool sysvolreset..
If you do, repeat the above again. Everything! 

User GPO's, only a group with the user is fine, and needs "apply GPO"
A computer GPO, needs Domain computers with apply GPO AND the users group. 

I've setup all "problem" shares, due to user NT Authority\SYSTEM problems. 
Google for it, you see lots of it in the samba list.
My shares layout that used it. ( on mulple servers ) 
DC: Sysvol and Netlogon
Members: users and profiles
Print server: print$ and printers

So in short, all shares were the "computer$" my access as user system or things like that. 

If you see errors on a computer in the eventlogs with: 
Computer$ can access .... Bla bla....   On GPO.ini.
This if often a forgoten "DOM\Domain Computers" in the GPO object with read and/or writes rights missing.
People test this and the computer$ can access the GPO.ini without problems, so why the event log.
Because of "SYSTEM" or an other user that is haveing user/group/SID problems with linux acls. 

I hope i explained good enough why i use and set ignore systemacl. 






> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens 
> Robert Marcano via samba
> Verzonden: woensdag 7 februari 2018 3:19
> Aan: samba at lists.samba.org
> Onderwerp: Re: [Samba] GPOs not Working!
> On 02/06/2018 03:24 PM, L.P.H. van Belle via samba wrote:
> > ok,
> > 
> > do the following.
> > set ignore systemacl to yes on sysvol and netlogon.
> Added "acl_xattr:ignore system acls = yes" to both shares, 
> restarted the 
> server
> > 
> > login as dom\administrator
> > computer manager, connect to dc.
> > share sysvol, goto share security, reset to defalts.
> > same for folder.
> I don't get the "Reset to defaults" option. There are two security 
> related tabs, "Permission of shared resources" (or something 
> like that, 
> Windows is not in English) with only permissions for Everyone 
> with Full 
> control, Change and Read.
> The other tab is the standard "Security" tab, those tabs 
> don't show any 
> reset to default option
> > 
> > goto gpo manager,
> > klik on every gpo object, if one has wrong acl, you get a 
> message to reset it, thats ok.
> > 
> > now never samba-tool sysvol reset
> > if you do, you might need to set share/file security again.
> > 
> > Greetz
> > Louis
> > 
> > p.s rowland, now you can change the default gpo’s also.
> > 
> > 
> > 
> >> Op 6 feb. 2018 om 20:14 heeft Rowland Penny via samba 
> <samba at lists.samba.org> het volgende geschreven:
> >>
> >> On Tue, 6 Feb 2018 15:03:16 -0400
> >> Robert Marcano via samba <samba at lists.samba.org> wrote:
> >>
> >>> Thanks for the information, to use a default GPO was a 
> simple way to
> >>> try to encourage someone to reproduce the problem.
> >>>
> >>> I already created new GPOs (this is a test domain) Using 
> the default
> >>> filter for a new GPO, "Authenticated users", creating a 
> new group for
> >>> the test clients and using that as the filter, checking 
> it have the
> >>> right permissions (apply), checking every guide about 
> applying GPO to
> >>> computers. Using OUs and using domain level GPOs.
> >>>
> >>> What I find weird is that gpresult doesn't list the computer as a
> >>> member of groups I create, only a few predefined ones:
> >>>
> >>>    NULL SID
> >>>    This company,
> >>>    and something like "mandatory level of no trust" 
> (Windows is not in
> >>> english)
> >>>
> >>
> >> Do not alter the two default GPOs, it doesn't work ;-)
> >>
> >> Creating new GPOs should work, just do not run sysvolreset after
> >> creating them.
> >>
> >> Rowland
> >>
> >>
> >>
> >> -- 
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> >>
> > 
> > 
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