[Samba] deny file access or specific users

[Rowland Penny]

On Wed, 10 Oct 2018 11:04:29 +0200
mj via samba <samba at lists.samba.org> wrote:

> Hi,
> 
> For some users I am trying to deny file access to our domain member 
> servers, yet keeping their AD account for all other purposes, like
> email and ldap authorized clients.
> 
> So I figured I removed the unix attributes from a user in ADUC, while 
> keeping the rest. I expected that would make the user 'invisible' for 
> the domain member (file) servers, while maintaining the account for 
> everything else.
> 
> Now, a day later, on one our domain member servers the user is gone:
> 
> > root at server1:~# wbinfo -u | grep test
> > test
> > root at server1:~# id test
> > id: ‘test’: no such user
> > root at server1:~# getent passwd test
> > root at server1:~# 
> 
> but on another server, the user still remains
> 
> > root at server2:~# wbinfo -u | grep test
> > test
> > root at server2:~# id test
> > uid=63993(test) gid=513(domain users) groups=513(domain
> > users),1000001(BUILTIN\users) root at server2:~# getent passwd test
> > test:*:63993:513::/home/WRKGRP/test:/bin/false
> > root at server2:~# 
> 
> Probably running net cache flush will remove the user on server2 as 
> well, but is there an expiration on the winbind cache? Will the user 
> disppear from server2 automatically after a certain period?

Yes, provided the user isn't logged into or connected to the share.
 
> 
> Otherwise we have to perform the additional manual flush of the net 
> cache on each domain member server, each time we want to deny
> fileserver access for a user.

You should only have to do this once, unless you are using the 'rid'
backend.

> 
> Or is there a better way to keeping everything, while centrally
> denying fileserver access for specific users?

Yes, set the users permissions with 'setfacl' or from Windows.

Rowland