[Samba] idmap config ad: can't resolve domain users' uids

[Rowland Penny]

On Fri, 16 Feb 2018 12:12:32 +0100
Francesco Malvezzi via samba <samba at lists.samba.org> wrote:

> dear experts,
> 
> I would like to setup idmap config ad. I have already the uidNumber
> attribute populated on AD.
> 
> But there is something very basic wrong with my config:

Yes, there is something wrong ;-)
See below

> 
> [global]
> 	netbios name = ADDC
> 	realm = EXAMPLE.ORG
> 	workgroup = EXAMPLEAD
> 	dns forwarder = #trimmed
> 	server role = active directory domain controller
> 	log level = 3
>         log file = /var/log/samba/log.%m
>         interfaces = eth0, lo
>         bind interfaces only = Yes
>         tls enabled  = yes
>         tls keyfile  = /opt/samba/private/tls/addc.key
>         tls certfile = /etc/ssl/certs/addc.pem
>         tls cafile   = /etc/ssl/certs/DigiCertCA.crt
> 	tls verify peer = ca_only
>         printcap name = /dev/null
>         ldap server require strong auth = allow_sasl_over_tls
> 

Okay to here.

> 	# idmap config for the EXAMPLEAD domain
> 	idmap config EXAMPLEAD : backend = ad
> 	idmap config EXAMPLEAD : schema_mode = rfc2307
> 	idmap config EXAMPLEAD : range = 1005-999999
> 
> 	idmap config * : backend = tdb
> 	idmap config * : range = 2000000-3999999

You cannot use the above lines on a DC, they do not work!
A DC uses idmap.ldb OR uidNumber & gidNumber attributes from AD

What OS ?
What version of Samba ?
Packages or self compiled ?
Have you set up libnss_winbind ?

Rowland