[gptalk] Re: Pre-defining default ACL on newly created GPOs

  • From: Auld Colin <colin.auld@xxxxxxxxxxxxxxxxxx>
  • To: "'gptalk@xxxxxxxxxxxxx'" <gptalk@xxxxxxxxxxxxx>
  • Date: Wed, 10 Jan 2007 17:32:41 -0000

Bart - See the link Darren supplied earlier.  This suggests you can remove /
add groups by modifying the default security descriptor of the Group Policy
Container schema object.
 
Darren -  This is an extract from the document:
 
To modify the DefaultSecurityDescriptor attribute for the Group Policy
Container classSchema object: 
1.       Log on to the forest schema master domain controller with an
account that is a member of the Schema Administrators group.    
2.       Start Mmc.exe, and then add the Schema snap-in.        
3.       Right-click Active Directory Schema, and then click Operations
Master. 
4.       Click The Schema may be modified on this domain controller, and
then click OK.  
5.       Use ADSI Editor to open the schema-naming context, and then locate
the CN=Group-Policy-Container object with the classSchema type. 
6.       View the properties of the object, and then find the
defaultSecurityDescriptor attribute.    
7.       Paste the following string into the value to remove write
permissions for domain administrators so that only enterprise administrators
would have write permissions: 
D:P(A;CI;RPLCLOLORC;;;DA)(A;CI;RPWPCCDCLCLOLORCWOWDSDDTSW;;;EA)(A;CI;RPWPCCD
CLCLOLORCWOWDSDDTSW;;;CO)(A;CI;RPWPCCDCLCLORCWOWDSDDTSW;;;SY)(A;CI;RPLCLORC;
;;AU)(OA;CI;CR;edacfd8f-ffb3-11d1-b41d-00a0c968f939;;AU) 

To give an additional group write permissions, append the following text to
the end of the previous text: 
(A;CI;RPWPCCDCLCLOLORCWOWDSDDTSW;;;Group_SID) 
Note that Group_SID is the SID of the group to which you are granting
permissions.

Note For Windows Server 2003, paste the follow string in the
defaultSecurityDescriptor attribute:
D:P(A;CI;RPLCLOLORC;;;DA)(A;CI;RPWPCCDCLCLOLORCWOWDSDDTSW;;;EA)(A;CI;RPWPCCD
CLCLOLORCWOWDSDDTSW;;;CO)(A;CI;RPWPCCDCLCLORCWOWDSDDTSW;;;SY)(A;CI;RPLCLORC;
;;AU)(OA;CI;CR;edacfd8f-ffb3-11d1-b41d-00a0c968f939;;AU)(A;CI;LCRPLORC;;;ED)

My question is this - I want to append a group to the existing ACL (i.e. I
don't want to remove Domain Admins or any group already on the ACL).  So I
shouldn't carry out step 7 above - right?  If that is the case, how do I add
just the required group... I'll have a look at the SDDL stuff tonight, but I
can't say I'm looking forwards to it :)

Thanks for your help

Colin
 
 
 
 
 
 
 
        
 

________________________________

From: gptalk-bounce@xxxxxxxxxxxxx [mailto:gptalk-bounce@xxxxxxxxxxxxx
<mailto:gptalk-bounce@xxxxxxxxxxxxx> ] On Behalf Of
bart.schillebeeks@xxxxxxxxxx
Sent: 10 January 2007 16:09
To: gptalk@xxxxxxxxxxxxx
Subject: [gptalk] Re: Pre-defining default ACL on newly created GPOs


Hi darren, Colin, 
 
I have actually kinda the same problem myself but it's not on the default
permissions of the gpo. 
 
We are having problems here because security has populated the domain local
"administrators" group with a lot of level 2 helpdesk memebers. 
This gives them access on all servers as administrator (their job) 
 
However they now can also link/create and unlink the existing gpo's in AD
 
this is set on the root of the AD for administrators "full control" but when
i want to give a deny access on the specific "gpolinking" right he wants to
split out the entire full control into seperate permissions. 
 
If we do that other functions of AD don't work correctly anymore. 
 
Any way to remove linking and creation permissions for all except "enterpise
admins" ? 
 

Vriendelijke groeten,
Cordialement,
Kind Regards, 
Schillebeeks Bart
Active Directory Security Consultant
Small and Departmental Systems - NT Systems Fortis Bank
Bart.schillebeeks@xxxxxxxxxxxxxx
AD Internet Consulting BVBA

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<mailto:Sales@xxxxxxxxxxxxxx> 


 

________________________________

From: gptalk-bounce@xxxxxxxxxxxxx [mailto:gptalk-bounce@xxxxxxxxxxxxx
<mailto:gptalk-bounce@xxxxxxxxxxxxx> ] On Behalf Of Darren Mar-Elia
Sent: Wednesday, January 10, 2007 3:40 PM
To: gptalk@xxxxxxxxxxxxx
Subject: [gptalk] Re: Pre-defining default ACL on newly created GPOs



Colin-

The only way to do this actually is to modify the defaultSecurityDescriptor
attribute on the gpcContainer class object in the AD schema (this is a mod
to the instance of a schema in your domain, not a change to the schema
itself). It requires being familiar with SDDL, but otherwise its pretty
straightforward. You might want to  check out this KB and then let us know
if you have questions:

 

http://support.microsoft.com/default.aspx?scid=kb;en-us;321476
<http://support.microsoft.com/default.aspx?scid=kb;en-us;321476> 

 

Darren

 

From: gptalk-bounce@xxxxxxxxxxxxx [mailto:gptalk-bounce@xxxxxxxxxxxxx
<mailto:gptalk-bounce@xxxxxxxxxxxxx> ] On Behalf Of Auld Colin
Sent: Wednesday, January 10, 2007 5:07 AM
To: 'gptalk@xxxxxxxxxxxxx'
Subject: [gptalk] Re: Pre-defining default ACL on newly created GPOs

 

Bart, thanks for the reply -

 

I've tried this, but there is no option on the Group Policy Objects
container which allows the setting of the AC (as far as I can see)..

 

I've dug a bit further and it looks like it might be possible by modifying
the domain level ACL (via the GPMC) - it looks as though I might have to
explicitly allow the Read gPOtion and Write gPOtion properties via the
advanced tab.  This seems a wee bit detailed  - does anyone know if there is
a less detailed way of doing this?

 

________________________________

From: gptalk-bounce@xxxxxxxxxxxxx [mailto:gptalk-bounce@xxxxxxxxxxxxx
<mailto:gptalk-bounce@xxxxxxxxxxxxx> ] On Behalf Of
bart.schillebeeks@xxxxxxxxxx
Sent: 10 January 2007 12:51
To: gptalk@xxxxxxxxxxxxx
Subject: [gptalk] Re: Pre-defining default ACL on newly created GPOs

Hi colin, 

 

I beleive you set the default editign permissions on

 

Group policy objects container (ou) in GPMC

Tab Delegation.

 

You have to do this for each domain. if this doesn't work you should use an
overall AD delegation object higher in the root. 

 

Vriendelijke groeten,
Cordialement,
Kind Regards, 
Schillebeeks Bart
Active Directory Security Consultant
Small and Departmental Systems - NT Systems Fortis Bank
Bart.schillebeeks@xxxxxxxxxxxxxx
AD Internet Consulting BVBA

Disclaimer:
Any views expressed in this message are those of the individual sender,
except where the message states otherwise and the sender is authorised to
state them to be the views of any such entity.This Message is in no way
legally binding and has to be viewed as a personal opinion of the sender.
This message reflects in no way the views of FORTIS BANK and its associates
and AD internet Consulting BVBA and its associates. Unless otherwise stated,
any pricing information given in this message is indicative only, is subject
to change and does not constitute an offer to deal at any price quoted. Any
reference to the terms of executed transactions should be treated as
preliminary only and subject to our formal written confirmation.

AD Internet Consulting BVBA, Hezemeer 7, 2430 Eindhout-Laakdal ON:0470419019
www.adinternet.com <www.adinternet.com>  mailto:Sales@xxxxxxxxxxxxxx
<mailto:Sales@xxxxxxxxxxxxxx> 

 

 

 

________________________________

From: gptalk-bounce@xxxxxxxxxxxxx [mailto:gptalk-bounce@xxxxxxxxxxxxx
<mailto:gptalk-bounce@xxxxxxxxxxxxx> ] On Behalf Of Auld Colin
Sent: Wednesday, January 10, 2007 1:43 PM
To: gptalk@xxxxxxxxxxxxx
Subject: [gptalk] Pre-defining default ACL on newly created GPOs

Hi, 

Does anyone know if it is possible to set the default ACL which is applied
to newly created GPOs.  Ideally, I'd like to be able to specify a "GPO
Modifier" group with "modify" access to each GPO as it is created,
automatically.

TIA 

Colin 

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