[Samba] Why some user names are not resolved by 'getfacl' ?

[Nicola Mingotti]

Hi,

I have a Samba NAS and a Samba DC. Both running in Linux Debian 10, stable.
Samba installed via .deb packages.

Recently i found this strange behavior in 'getfacl' output. Some user names
are correctly reported, for others instead only a number is shown.

Note that, if the same domain user runs
-------
WINDOM\riccardo at nas $> getfacl aaa-test-riccardo-2/
-------
all usernames are correctly shown.
So, for example:
-------
WINDOM\riccardo at nas> getent passwd | grep 10512
WINDOM\adam1:*:11127:10512::/home/WINDOM-adam1:/bin/bash
---------

Misbehavior example. Observe user '10512' is not resolved to 
'WINDOM\adam1', for example.
------------------------------
WINDOM\riccardo at nas $> getfacl aaa-test-riccardo-2/
---- long output ------
# file: aaa-test-riccardo-2/
# owner: root
# group: adm
user::rwx
user:10512:rwx
user:10513:r-x
user:11157:rwx
user:11159:r-x
user:11173:r-x
user:11180:rwx
group::r-x
group:WINDOM\\domain\040admins:rwx
group:WINDOM\\domain\040users:r-x
group:WINDOM\\riccardo:rwx
group:WINDOM\\g-ufficiotecnico:rwx
group:WINDOM\\g-leggitutto:r-x
group:WINDOM\\g-utentiufficio:r-x
group:WINDOM\\g-foto-video:rwx
mask::rwx
other::---
default:user::rwx
default:user:10512:rwx
default:user:10513:r-x
default:user:WINDOM\\riccardo:rwx
default:user:11157:rwx
default:user:11159:r-x
default:user:11173:r-x
default:user:11180:rwx
default:group::r-x
default:group:WINDOM\\domain\040admins:rwx
default:group:WINDOM\\domain\040users:r-x
default:group:WINDOM\\g-ufficiotecnico:rwx
default:group:WINDOM\\g-leggitutto:r-x
default:group:WINDOM\\g-utentiufficio:r-x
default:group:WINDOM\\g-foto-video:rwx
default:mask::rwx
default:other::---
------------------

I rebooted the NAS, that was of no help.

I can tell you that this directory was made by a Windows system.
If a make the same directory, with the same domain user, but from
a Linux system the result is much shorter.

Thank in advance for any hint you may give me !

bye
Nicola