[Samba] Samba4 Kerberos Authentication Error

[Rowland Penny]

On Wed, 5 Dec 2018 10:56:48 -0500
Marco Shmerykowsky PE via samba <samba at lists.samba.org> wrote:

> 
> On 12/5/2018 10:37 AM, Marco Shmerykowsky via samba wrote:
> > On Wed, December 5, 2018 9:52 am, Rowland Penny via samba wrote:
> >> On Wed, 5 Dec 2018 09:41:13 -0500
> >> Marco Shmerykowsky via samba <samba at lists.samba.org> wrote:
> >>
> >>> I'm trying to setup a Samba4 Active Directory server.
> >>>
> >>> I've gotten the server running, the IP addresses resolve
> >>> properly.  The Windows10 client can join the domain.
> >>> I've run the basic checks that seem to be listed
> >>> on the samba wiki and get the expected results.
> >>>
> >>> I've modified nsswitch.conf to include winbind on the
> >>> passwd and group lines.
> >>>
> >>> I've made sure all machines are pointing to the same
> >>> NTP server so that time is synched
> >>>
> >>> I've created a user using -> samba-tool user create jdoe
> >>>
> >>> I've added the computer using -> samba-tool computer create
> >>> MACHINE01
> >>>
> >>> I've created a "test-share" with ownership set to the
> >>> group "Domain Users":
> >>>
> >>> [Test-Share]
> >>>          path = /home/test-share
> >>>          writable = yes
> >>>          create mode = 0770
> >>>          directory mode = 0770
> >>>          guest ok = no
> >>>
> >>> When I run Server Manager in Win10 I get an error that
> >>> states: "Kerberos authentication error"
> >>>
> >>> When I try to login with the user, Windows gives me this:
> >>>
> >>> "We can't sign you in with this credential because your
> >>> domain isn't available.  Make sure your device is connected
> >>> to your organization's network and try again."
> >>>
> >>> Login authentication didn't seem to work before I
> >>> added the test-share either.
> >>>
> >>> What did I miss?
> >>>
> >>
> >> You missed posting your smb.conf for a start ;-)
> >>
> >> Did you actually join the Win10 machine to the domain ?
> >> Creating it with samba-tool isn't enough.
> >>
> >> Rowland
> > 
> > Smb.conf (domain names made 'generic'):
> > 
> > # Global parameters
> > [global]
> >          dns forwarder = 4.2.2.2
> >          netbios name = MACHINE254
> >          realm = INTERNAL.COMPANY.COM
> >          server role = active directory domain controller
> >          workgroup = INTERNAL
> >          idmap_ldb:use rfc2307 = yes
> > 
> > [netlogon]
> >          path = /var/lib/samba/sysvol/internal.company.com/scripts
> >          read only = No
> > 
> > [sysvol]
> >          path = /var/lib/samba/sysvol
> >          read only = No
> > 
> > [Test-Share]
> >          path = /home/test-share
> >          writable = yes
> >          create mode = 0770
> >          directory mode = 0770
> >          guest ok = no
> > 
> > Windows reported that the machine joined the domain
> > when I used the windows interface at System
> > Properties -> Computer Name.
> > 
> > 
> One more tidbit.  I ran the provisioning twice.
> 
> First time around I used int.company.com and second time around
> I used internal.company.com.  Did that leave contradictory
> information floating in the system?

No, provided you removed the smb.conf (and the provision would have
complained if you hadn't), the next provision would wipe the previous
one.

This does raise a possibility, The REALM has to be the same as the dns
domain, so what is the dns domain name ?
easiest way to find out is to open a terminal on the DC and type
'hostname -d', if it isn't 'internal.company.com' then you need to
provision again.

Another possibility is that you do not have winbind installed.

This probably hasn't anything to do with your main problem, but you
should change your share to this:

[Test-Share]
    path = /home/test-share
    read only = No

When you get your DC working, set the permissions from Windows, see
here:

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

Rowland