[Samba] Cannot add/modify ACL through windows client

Denis Cardon denis.cardon at tranquil-it-systems.fr
Tue May 14 09:56:56 MDT 2013

Hi Lucas,

> I am struggling around with Windows ACLs and cannot find a solution nor how to troubleshoot that. I have two samba3 hosts. Hostname "donald" is my domain controller with samba 3.x + OpenLDAP server running. Hostname "pluto" is my other samba 3.x server which was joined to my domain. I use LDAP for my users+groups. I dont have winbind on my machines. On hostname "pluto" I have a share in smb.conf which says:
> [free4all]
> path = /data/free4all
> read only = No
>                create mask = 0777
>                directory mask = 0777
>                vfs object = acl_xattr
>                nt acl support = yes
>                dos filemode = yes
> "testparm -s -a -v |grep acl" shows me:
> acl compatibility = auto
>          acl check permissions = Yes
>          acl group control = No
>          acl map full control = Yes
>          force unknown acl user = No
>          inherit acls = No
>          nt acl support = Yes
>          profile acls = No
>          map acl inherit = No
>          vfs objects = acl_xattr
>          force unknown acl user = Yes
> On a windows client I am right-clicking on \\pluto\free4all\subdir and choose the "Security" tab. I see a user called "Everyone" and a user without username, but only SID number. The SID is S-1-5-21-blablabla-1234567-blabla-500.  I manually checked this SID at my LDAP database. Funnily I have two users with this same SID, one is called "root" and the is called "admin". Weird, but not important imho at this point.

Rid -500 is part of the well known SID, it should be for admin user and 
shouldn't be used for root (http://support.microsoft.com/kb/243330)

> Back on the windows client, inside the "Security" tab, I click on "Add" and choose a user of my Domain Users. I see him in the list. But as soon as I click "Apply" on this window, the user disappears from the security tab list. The logfile at samba-server hostname=pluto outputs:
> [2013/05/14 15:48:08.861822,  0] smbd/posix_acls.c:1755(create_canon_ace_lists)
>    create_canon_ace_lists: unable to map SID S-1-5-21-1062190697-4189521229-2202214947-129762 to uid or gid.
> This SID was the user I tried to add. Why does this not work and how should I fix or even troubleshoot that? I really need some assistance, I have no clue what else to try. Thanks to everyone.

Are you sure that there is a uid/gid mapping for your samba users on 
your server. For instance, if you type "id myusername" or "getent 
passwd", do you get a uid?

If not, you should check if your /etc/nsswitch.conf configuration is ok. 
If you don't use winbind, you should have nssldap configured.



> Lucas.

Denis Cardon
Tranquil IT Systems
Les Espaces Jules Verne, bâtiment A
12 avenue Jules Verne
44230 Saint Sébastien sur Loire
tel : +33 (0)

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