[Samba] Users can't access files on shares

[Thomas Harold]

On 1/14/2014 5:59 AM, Luka Goltnik wrote:
> Hello fellow Samba experts,
>
> I come to you in hour of need. :-)
>
> I have successfully set up Samba 4. It's acting as a AD domain controller
> and on it I have 4 users, 4 groups and 6 shares. For most of the time
> everything works fine, but samba has occasional glitches.
>
> The glitches appear in such way that one user is let's say editing excel
> file, and after saving the file and exiting excel, another user wants to
> edit it as well, but get's a window saying "Access denied. Contact your
> administrator!".
>
> So I go exploring what's wrong and open properties of that file, check the
> security tab and notice that surprisingly there is no Group or user name
> written as having rights to access this file.
> When I try to add group to the permission box I just get an error "Unable
> to save permission changes on <filename.ext>. Access is denied."

As a guess in the dark, this sounds like your file system which hosts 
the share does not support "extended ACLs".

https://wiki.samba.org/index.php/Setup_and_configure_file_shares

If using ext4 for your shares, you need to change /etc/fstab and add the 
following mount options: user_xattr,acl