samba - Sep 2016 - Winbind / Samba auth problem after username change

Hi,

before we switched to SSSD we've been implementing the ssh authentication
method via Domain using winbind+samba.
Version installed on our machines is (still) 2:4.1.6+dfsg-1ubuntu2.14.04.13. So
far everything has been working fine, however
after we had to change a user's logon name in the domain he can't login
anymore. auth.log shows still his old username followed by "from <IP>
not allowed because none of user's groups are listed in AllowGroups". I
searched several websites for a solution but only found recommendations on
deleting
the winbind cache at /var/lib/samba. However this didn't fix the problem.
When I do a grep using getent passwd on the users NEW name, it shows up.
So actually the domain controllers is delivering the correct username.

Is this a known bug in version 4.1.6 or can I solve this any other way without
running a package upgrade on a production machine?

Cheers
Julian

Wichtiger Hinweis: Der Inhalt dieser E-Mail ist vertraulich und ausschlie?lich
f?r den bezeichneten Adressaten bestimmt. Wenn Sie nicht der vorgesehene
Adressat dieser E-Mail oder dessen Vertreter sein sollten, so beachten Sie
bitte, dass jede Form der Kenntnisnahme, Ver?ffentlichung, Vervielf?ltigung oder
Weitergabe des Inhalts dieser E-Mail unzul?ssig ist. Wir bitten Sie, sich in
diesem Fall mit dem Absender der E-Mail in Verbindung zu setzen. Wir m?chten Sie
au?erdem darauf hinweisen, dass die Kommunikation per E-Mail ?ber das Internet
unsicher ist, da f?r unberechtigte Dritte grunds?tzlich die M?glichkeit der
Kenntnisnahme und Manipulation besteht

Important Note: The information contained in this e-mail is confidential. It is
intended solely for the addressee. Access to this e-mail by anyone else is
unauthorized. If you are not the intended recipient, any form of disclosure,
reproduction, distribution or any action taken or refrained from in reliance on
it, is prohibited and may be unlawful. Please notify the sender immediately. We
also would like to inform you that communication via e-mail over the internet is
insecure because third parties may have the possibility to access and manipulate
e-mails.

On Tue, 6 Sep 2016 08:17:12 +0000
Julian Zielke via samba <samba at lists.samba.org> wrote:
> Hi,
> 
> before we switched to SSSD we've been implementing the ssh
> authentication method via Domain using winbind+samba. Version
> installed on our machines is (still) 2:4.1.6+dfsg-1ubuntu2.14.04.13.
> So far everything has been working fine, however after we had to
> change a user's logon name in the domain he can't login anymore.
> auth.log shows still his old username followed by "from <IP> not
> allowed because none of user's groups are listed in AllowGroups".
I
> searched several websites for a solution but only found
> recommendations on deleting the winbind cache at /var/lib/samba.
> However this didn't fix the problem. When I do a grep using getent
> passwd on the users NEW name, it shows up. So actually the domain
> controllers is delivering the correct username.
> 
> Is this a known bug in version 4.1.6 or can I solve this any other
> way without running a package upgrade on a production machine?
> 
> Cheers
> Julian
> 
How did you change the users logon name ?
Have you checked the users object in AD ?

Rowland

Hi,

You had a working environment using Winbind to retrieve user from AD.
You had to change that and now you have replaced Winbind by SSSD.
You changed some user names, those can't login any more.

When using "getent passwd | grep <username>" you have response.

A small note: rather than "getent passwd | grep <username>"
which is
resource consuming you can do "getent passwd <username>". You
ask here for
one user only which needs less resources, you should have one line as a
response.

For me your configuration is almost good, at least for the part which is
responsible to retrieve users from the domain.

It seems you are lacking some configuration to tell SSSD which group can
login (because of "not allowed because none of user's groups are listed
in
AllowGroups").

Add some groups in "AllowGroups" or don't use that feature. That
should let
your users log in.

Cheers,

M.

2016-09-06 10:17 GMT+02:00 Julian Zielke via samba <samba at
lists.samba.org>:
> Hi,
>
> before we switched to SSSD we've been implementing the ssh
authentication
> method via Domain using winbind+samba.
> Version installed on our machines is (still)
2:4.1.6+dfsg-1ubuntu2.14.04.13.
> So far everything has been working fine, however
> after we had to change a user's logon name in the domain he can't
login
> anymore. auth.log shows still his old username followed by "from
<IP> not
> allowed because none of user's groups are listed in AllowGroups".
I
> searched several websites for a solution but only found recommendations on
> deleting
> the winbind cache at /var/lib/samba. However this didn't fix the
problem.
> When I do a grep using getent passwd on the users NEW name, it shows up.
> So actually the domain controllers is delivering the correct username.
>
> Is this a known bug in version 4.1.6 or can I solve this any other way
> without running a package upgrade on a production machine?
>
> Cheers
> Julian
>
> Wichtiger Hinweis: Der Inhalt dieser E-Mail ist vertraulich und
> ausschlie?lich f?r den bezeichneten Adressaten bestimmt. Wenn Sie nicht der
> vorgesehene Adressat dieser E-Mail oder dessen Vertreter sein sollten, so
> beachten Sie bitte, dass jede Form der Kenntnisnahme, Ver?ffentlichung,
> Vervielf?ltigung oder Weitergabe des Inhalts dieser E-Mail unzul?ssig ist.
> Wir bitten Sie, sich in diesem Fall mit dem Absender der E-Mail in
> Verbindung zu setzen. Wir m?chten Sie au?erdem darauf hinweisen, dass die
> Kommunikation per E-Mail ?ber das Internet unsicher ist, da f?r
> unberechtigte Dritte grunds?tzlich die M?glichkeit der Kenntnisnahme und
> Manipulation besteht
>
> Important Note: The information contained in this e-mail is confidential.
> It is intended solely for the addressee. Access to this e-mail by anyone
> else is unauthorized. If you are not the intended recipient, any form of
> disclosure, reproduction, distribution or any action taken or refrained
> from in reliance on it, is prohibited and may be unlawful. Please notify
> the sender immediately. We also would like to inform you that communication
> via e-mail over the internet is insecure because third parties may have the
> possibility to access and manipulate e-mails.
> --
> To unsubscribe from this list go to the following URL and read the
> instructions:  https://lists.samba.org/mailman/options/samba
>

Hi Rowland,

we're using the Windows mmc for administrating samba sernet DCs running
samba-sernet-ad 4.2.11-9.
4 Domain controllers are present. Primary DC replicates to a second in our local
office and to 2 others in a vpn connected network.
Changes are made on our primary dc always. DC 3 and 4 and the primary and
secondary DC responsible for ssh authentication on our linux boxes
having the problem.

Cheers,
Julian

-----Ursprüngliche Nachricht-----
Von: samba [mailto:samba-bounces at lists.samba.org] Im Auftrag von Rowland
Penny via samba
Gesendet: Dienstag, 6. September 2016 10:31
An: samba at lists.samba.org
Betreff: Re: [Samba] Winbind / Samba auth problem after username change

On Tue, 6 Sep 2016 08:17:12 +0000
Julian Zielke via samba <samba at lists.samba.org> wrote:
> Hi,
>
> before we switched to SSSD we've been implementing the ssh
> authentication method via Domain using winbind+samba. Version
> installed on our machines is (still) 2:4.1.6+dfsg-1ubuntu2.14.04.13.
> So far everything has been working fine, however after we had to
> change a user's logon name in the domain he can't login anymore.
> auth.log shows still his old username followed by "from <IP> not
> allowed because none of user's groups are listed in AllowGroups".
I
> searched several websites for a solution but only found
> recommendations on deleting the winbind cache at /var/lib/samba.
> However this didn't fix the problem. When I do a grep using getent
> passwd on the users NEW name, it shows up. So actually the domain
> controllers is delivering the correct username.
>
> Is this a known bug in version 4.1.6 or can I solve this any other way
> without running a package upgrade on a production machine?
>
> Cheers
> Julian
>
How did you change the users logon name ?
Have you checked the users object in AD ?

Rowland

--
To unsubscribe from this list go to the following URL and read the
instructions:  https://lists.samba.org/mailman/options/samba
Wichtiger Hinweis: Der Inhalt dieser E-Mail ist vertraulich und ausschließlich
für den bezeichneten Adressaten bestimmt. Wenn Sie nicht der vorgesehene
Adressat dieser E-Mail oder dessen Vertreter sein sollten, so beachten Sie
bitte, dass jede Form der Kenntnisnahme, Veröffentlichung, Vervielfältigung oder
Weitergabe des Inhalts dieser E-Mail unzulässig ist. Wir bitten Sie, sich in
diesem Fall mit dem Absender der E-Mail in Verbindung zu setzen. Wir möchten Sie
außerdem darauf hinweisen, dass die Kommunikation per E-Mail über das Internet
unsicher ist, da für unberechtigte Dritte grundsätzlich die Möglichkeit der
Kenntnisnahme und Manipulation besteht

Important Note: The information contained in this e-mail is confidential. It is
intended solely for the addressee. Access to this e-mail by anyone else is
unauthorized. If you are not the intended recipient, any form of disclosure,
reproduction, distribution or any action taken or refrained from in reliance on
it, is prohibited and may be unlawful. Please notify the sender immediately. We
also would like to inform you that communication via e-mail over the internet is
insecure because third parties may have the possibility to access and manipulate
e-mails.