[Samba] realmd and net rpc privileges

Sebastian Gabler sequoiamobil at gmx.net
Thu Apr 30 10:23:45 MDT 2015

Am 30.04.2015 um 10:13 schrieb Rowland Penny:
> On 30/04/15 09:05, Sebastian Gabler wrote:
>> There is something to add. Listing existing rights (any rights that
>> is, thus using the current, root, user) fails with the same problem:
>> # net rpc rights list
>> Enter root's password:
>> Could not connect to server
>> The username or password was not correct.
>> Connection failed: NT_STATUS_LOGON_FAILURE
>> I conclude of that net cannot authenticate at all for this purpose,
>> and the first step would be to solve that. The question is: How?
>> Br
>> Sebastian
>> Am 29.04.2015 um 14:10 schrieb Sebastian Gabler:
>>> Am 29.04.2015 um 12:58 schrieb L.P.H. van Belle:
>>>> so tell us what are your errors?
>>>> It's hard to help without them.
>>>> Please post your smb.conf ( sanitized ) and your resolv.conf and
>>>> hosts file.
>>>> and..
>>>> you can try the command :
>>>> net rpc rights grant 'SAMDOM\Domain Admins' SeDiskOperatorPrivilege
>>>> -U'SAMDOM\administrator' -S servername.fqdn
>>>> greetz,
>>>> Louis
>>> I am getting the error listed here:
>>> https://wiki.samba.org/index.php/Samba_Member_Server_Troubleshooting:
>>> # net rpc rights grant 'SAMDOM\Domain Admins'
>>> SeDiskOperatorPrivilege -U'SAMDOM\administrator'
>>> Enter SAMDOM\administrator's password:
>>> Could not connect to server
>>> The username or password was not correct.
>>> Connection failed: NT_STATUS_LOGON_FAILURE
>>> resolv.conf is automatically filled by Network Manager here (which
>>> gets the settings from the DHCP server, which is the DC in my case)
>>> hosts has no entries besides the localhost defaults for 'lo'
>>> hostname returns the fqdn DNS resolsution and ntp sync are
>>> perefectly fine. Domain users can log on, and get homes. (I don't
>>> care about that too much, but it's nice to see it working.)
>>> This is the testparm dump, with '#' comments:
>>> [global]
>>>         realm = MYDOMAIN.LOCAL # here is the actual realm value
>>>         server string = Samba Server Version %v
>>>         security = ADS
>>>         username map = /etc/samba/user.map
>>>         kerberos method = system keytab
>>>         log file = /var/log/samba/log.%m
>>>         max log size = 50
>>>         load printers = No
>>>         printcap name = /dev/null
>>>         idmap config * : backend = tdb
>>>         map acl inherit = Yes
>>>         cups options = raw
>>>         vfs objects = acl_xattr
>>> [Acls] # this is my test share
>>>         path = /srv/samba/acls/
>>>         read only = No
>>> Looking at these, it comes to my attention that there is no idmap on
>>> that machine (I mean, not as a deamon, not as a command). Could that
>>> be part of the problem?
>>> in the -S option above, does servername.fqdn refer to the DC or to
>>> the local machine?
>>> Also,  was puzzled if the PW to enter is the root PW or the Domain
>>> Amdin PW. I tried both, always.
>>> Best,
>>> Sebastian
> You need to map root to Administrator, add this line to smb.conf:
> username map = /etc/samba/user.map
> Then create the map file, it is just one line:
> !root = EXAMPLE\Administrator Administrator administrator
> Change 'EXAMPLE' for your workgroup name.
> Rowland
Thanks for the hints.

You may want to note that 'username map' is already in my conf, line 4 
from the top of the global section. Content of the map file is "!root = 
administrator at mydomain.local Administrator administrator" . The syntax 
for the domain admin user follows the one suggested by realmd, that is 
user at domain.local.

That is, to my understanding I already did what you suggest, and said so 
in my original message.

Not sure about 3 things:

1. why would authentication of net rpc fail against the local root user 
on the local machine? Why does it even ask for the pasword anyhow when I 
run it as root? That is, irrespective of any user maps, not making any 
sense to me.
2. Where does the 'Workgroup\Administrator syntax you are suggesting 
coming from? I am joined to a domain - how would this matter?
3. Not sure I mentioned it earlier, but: I can indeed change Ownership 
of folders, ACLs and permissions from Windows as Domain Admin. What 
doesn't work is creating new shares from Computer Administration 
console, and change share ownership to other users from there.

Best regards,


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