[Samba] winbind use default domain problem after upgrade

[Perttu Aaltonen]

> On 4. Mar 2021, at 17.08, Rowland penny via samba <samba at lists.samba.org> wrote:
> 
> On 04/03/2021 13:56, Perttu Aaltonen via samba wrote:
>> 
>> Hi Rowland,
>> 
>> The DC is still an old Samba 4.1.9 in Debian 7. We are waiting for either a decision to upgrade it or move to a cloud DC, in which case we will just decommission it. Has been working fine though up until now. It’s just a user directory, nothing fancy like GPO.
>> 
>> SMBv1 is for certain legacy clients, like the Supermicro IPMI virtual media where I ran into this problem in the first place. I asked Supermicro support if they have any fixes for this in newer firmware releases, but they just replied that it’s not tested or supported with Samba. Their web UI doesn’t even allow the \ character so it’s not possible to include the domain in the user name.
> 
> 
> You can change the winbind separator.

How does changing the separator affect clients that have saved credentials with the standard separator? In any case, I tried it with a spare server and got this:

  [2021/03/05 10:27:24.171714,  2] ../../auth/auth_log.c:635(log_authentication_event_human_readable)
  Auth: [SMB,(null)] user []\[DOMAIN+user] at [Fri, 05 Mar 2021 10:27:24.171689 EET] with [NTLMv1] status [NT_STATUS_NO_SUCH_USER] workstation [192.168.0.11] remote host [ipv4:192.168.0.11:48556] mapped to []\[DOMAIN+user]. local host [ipv4:192.168.0.10:445] 

So looks like the mapping isn’t working with a different separator either. It seems to be client or protocol specific because from another machine it says “....with [NTLMv2]….mapped to [DOMAIN]\[DOMAIN+user]”.

> 
>> 
>> The config is below. Some of it is from a previous admin so might include redundant or unnecessary options for current releases.
> 
> 
> The only setting I would query is this:
> 
> unix password sync = yes
> 
> Not sure why you have this, you shouldn't have users in AD and /etc/passwd. If you do have users in both places, then this may be your problem.

No identical users in both places, removed this but no effect.

Perttu