[Samba] Users loose supplementary groups after a time

Orion Poplawski orion at nwra.com
Fri May 15 18:27:11 UTC 2020

On 5/15/20 8:22 AM, Rowland penny via samba wrote:
> On 15/05/2020 14:56, Orion Poplawski wrote:
>> On 5/15/20 12:56 AM, Rowland penny via samba wrote:
>>> On 14/05/2020 21:59, Orion Poplawski via samba wrote:
>>>> This configuration (dropping the username map script hack) seems to be
>>>> working
>>>> for us, does this seem correct?
>>>>          idmap config * : backend = tdb
>>>>          idmap config * : range = 1000000-1999999
>>>>          idmap config DOMAIN : backend = nss
>>>>          idmap config DOMAIN : range = 1000-999999
>>>>          winbind scan trusted domains = no
>>> Yes, that should work for your setup. It will map your local users to IPA
>>> users.
>> Thanks for the response.
>>> It isn't the way that I would do it though ;-)
>>>  From what you have posted, you are mapping local users to IPA users and
>>> the IPA is in a trust with AD, I would just ignore IPA and join the
>>> computer to AD and get your users and groups directly. If you have AD, why
>>> not leverage it and have all users & groups stored in AD ?
>> We do have all of our users and groups stored in AD :).  But we also have
>> lots of Linux systems that are best managed via IPA.  I suppose we could
>> have some that are just joined to AD, but I suspect that this would create
>> its own headaches and inconsistencies.
> Do you have any Samba shares ? From Samba 4.8.0 you cannot use sssd (not that
> I am saying you are using sssd).

Yes, the main issue here is around access to samba shares.  I can't really
parse the statement that "you cannot use sssd".  Of course we are using sssd.
That's what is resolving the the AD users into local unix users via the IPA -
AD trust.  What exactly do you mean when you say that we cannot use sssd?

> I am struggling to understand just what IPA gives you, except for
> authentication and you can do this with Samba directly from AD.

Lots with regard to policy and authorization:

- Fine grained PAM access controls for each host, user, group, service.
- Centralized sudo rules.
- Certificate issuance and renewal.
- Centralized automount configuration.

> The whole idea behind AD is to get centralised authentication (which from my
> understanding is what IPA does), so why have two authentication centres ?

There's more to it then authentication :)

Orion Poplawski
Manager of NWRA Technical Systems          720-772-5637
NWRA, Boulder/CoRA Office             FAX: 303-415-9702
3380 Mitchell Lane                       orion at nwra.com
Boulder, CO 80301                 https://www.nwra.com/

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