[Samba] Users loose supplementary groups after a time
orion at nwra.com
Fri May 15 13:56:08 UTC 2020
On 5/15/20 12:56 AM, Rowland penny via samba wrote:
> On 14/05/2020 21:59, Orion Poplawski via samba wrote:
>> Sorry, I thought I had re-enabled delivery, but I had not. So trying
>> to reply
>> to Rowland Penny here:
>>> On 14/05/2020 18:46, Orion Poplawski via samba wrote:
>>>> All -
>>>> I seem to be suffering from the common complaint that users loose
>>>> supplementary group access after a while - in our case it seems to be
>>>> connections left overnight. Restarting smb fixes it. I haven't
>>>> been able to
>>>> determine the cause.
>>>> though I think that is to be expected at this point as we are not using
>>>> winbind idmapping to map AD users, but rather we have an IPA - AD
>>>> trust and so
>>>> have local unix users already.
>>> Yes, but is winbind running ?>> Server is Scientific Linux release 7.8
>>>> workgroup = DOMAIN
>>>> security = ads
>>>> realm = AD.DOMAIN
>>>> # Workaround unix group issue
>>>> username map script = /bin/echo
>>>> Is the above now causing more issues?
>>> I think it is what isn't there that is the problem
>>>> Recent changes that I can think of are then 7.8 update and
>>>> configuring AD
>>>> sites. Though I think this problem has likely been occurring for a
>>>> long time
>>>> - but for some reason we are seeing more connections left overnight.
>>> You do not say what you upgraded from, but 7.8 will now mean you have a
>>> Samba version >= 4.8.0 and from Samba 4.8.0 you need to run winbind if
>>> you have 'security = ADS' in smb.conf. This also means you need the
>>> 'idmap config' lines as well, which means you cannot have the same users
>>> in /etc/passwd.
>> I upgraded from 7.7. And yes since we've had samba >= 4.8.0 for a
>> while now
>> we've been running winbind.
>> This configuration (dropping the username map script hack) seems to be
>> 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.
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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