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Re: [Samba] "This security ID may not be assigned as the owner of this object" when trying to create a GPO





On 25/04/17 20:18, Sebastian Arcus via samba wrote:
I have upgraded Samba from a NT PDC to an AD DC about a week ago.
Everything went pretty well until today. I've already configured about
25 GPO's (through RSAT on a Windows 10 machine) - but when I came to add
more GPO's - it wouldn't let me with the above error message.

Replying to my own post, in case it helps someone. After hours of trial and error, I discovered that enabling the Recycle vfs module globally in smb.conf caused this. I still don't have a full understanding as to how did it cause all the security errors related to creating GPO's - but disabling the Recycle module globally got everything working fine again.




Samba 4.5.0
Slackware -current 64bit
Kernel 4.4.20

The client machine is a Windows 10 Pro.

On the server I tried "samba-tool ntacl sysvolreset", which completes,
but sysvolcheck has always given errors from the beginning of the
upgrade (and keeps on doing so):

#samba-tool ntacl sysvolcheck

ERROR(<class 'samba.provision.ProvisioningError'>): uncaught exception -
ProvisioningError: DB ACL on GPO directory
/var/lib/samba/sysvol/hebi.lan/Policies/{31B2F340-016D-11D2-945F-00C04FB984F9}
O:LAG:DAD:P(A;OICI;0x001f01ff;;;DA)(A;OICI;0x001f01ff;;;EA)(A;OICIIO;0x001f01ff;;;CO)(A;OICI;0x001f01ff;;;DA)(A;OICI;0x001f01ff;;;SY)(A;OICI;0x001200a9;;;AU)(A;OICI;0x001200a9;;;ED)
does not match expected value
O:DAG:DAD:P(A;OICI;0x001f01ff;;;DA)(A;OICI;0x001f01ff;;;EA)(A;OICIIO;0x001f01ff;;;CO)(A;OICI;0x001f01ff;;;DA)(A;OICI;0x001f01ff;;;SY)(A;OICI;0x001200a9;;;AU)(A;OICI;0x001200a9;;;ED)
from GPO object
  File "/usr/lib64/python2.7/site-packages/samba/netcmd/__init__.py",
line 176, in _run
    return self.run(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/samba/netcmd/ntacl.py", line
270, in run
    lp)
  File "/usr/lib64/python2.7/site-packages/samba/provision/__init__.py",
line 1723, in checksysvolacl
    direct_db_access)
  File "/usr/lib64/python2.7/site-packages/samba/provision/__init__.py",
line 1674, in check_gpos_acl
    domainsid, direct_db_access)
  File "/usr/lib64/python2.7/site-packages/samba/provision/__init__.py",
line 1621, in check_dir_acl
    raise ProvisioningError('%s ACL on GPO directory %s %s does not
match expected value %s from GPO object' % (acl_type(direct_db_access),
path, fsacl_sddl, acl))

I also get a not very helpful error from samba-tool gpo aclcheck:

#samba-tool gpo aclcheck

ERROR(<type 'exceptions.KeyError'>): uncaught exception - 'No such element'
  File "/usr/lib64/python2.7/site-packages/samba/netcmd/__init__.py",
line 176, in _run
    return self.run(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/samba/netcmd/gpo.py", line
1150, in run
    ds_sd_ndr = m['nTSecurityDescriptor'][0]

Could anyone provide some hints as to where I should be looking next?
What bugs me is that everything was working fine until today - and it
stopped working seemingly out of the blue. I was mainly adding GPO's and
not touching the main config - so can't work out what could have gone
wrong.

Many thanks for any hints.


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