[Samba] Winbind / Samba auth problem after username change

Tue Sep 6 13:00:21 UTC 2016

Hey Mathias,

well we don't use ldapmodify. We use Windows machines for our domain administration and the build-in Windows Domain Administration tools which work
fine with samba sernet DCs. All we do is change the fields "logon name, name and surname" in the gui. So when I say SAMMAccountName I'm referring to the logon name
our windows machines are using too.

Cheers,
Julian

> -----Ursprüngliche Nachricht-----
> Von: samba [mailto:samba-bounces at lists.samba.org] Im Auftrag von
> mathias dufresne via samba
> Gesendet: Dienstag, 6. September 2016 14:43
> An: Rowland Penny <rpenny at samba.org>
> Cc: samba <samba at lists.samba.org>
> Betreff: Re: [Samba] Winbind / Samba auth problem after username change
>
> I did tried to use ldapmodify to modify RDN (as CN is used for group
> membership and also used to forge DN) and this change was reflected into
> the group this belongs to.
>
> As ldapmodify is external tool, as it works well with that external tool, I would
> expect internal tools provided by Samba or MS are working well too.
>
> Anyway Julian you should check if the change is reflected into groups.
> You should also give us what is the LDAP attribute you changed. A user name
> is not a unique notion into AD, CN is user name, as are sAMAccountName or
> userPrincipalName, or also uid.
>
> 2016-09-06 13:55 GMT+02:00 Rowland Penny via samba
> <samba at lists.samba.org>:
>
> > On Tue, 6 Sep 2016 11:41:59 +0000
> > Julian Zielke via samba <samba at lists.samba.org> wrote:
> >
> > > OK I think I got some more information for you guys. I just did
> > > “getent passwd <NEWusername>” and got: <OLD
> > > username>:*:<ID>:<ID2>::/home/…/<OLD username>:/bin/bash.
> > >
> > > When I do “su - <NEW username>” I get a valid shell with
> > > notification “No directory, logging in with HOME=/”. When I do the
> > > same with the OLD username I get “No passwd entry for user '<OLD
> username>'”.
> > >
> > > It’s like the new name is the only valid one but still has a
> > > hardlink to the old one… really weird…
> > >
> > >
> > > Von: mathias dufresne [mailto:infractory at gmail.com]
> > > Gesendet: Dienstag, 6. September 2016 13:30
> > > An: Rowland Penny <rpenny at samba.org>
> > > Cc: samba <samba at lists.samba.org>; Julian Zielke
> > > <jzielke at next-level-integration.com> Betreff: Re: [Samba] Winbind /
> > > Samba auth problem after username change
> > >
> > > Hum...
> > > All users are OK except the one(s) you changed there names. No other
> > > modification in configuration, all others users are working well. Is
> > > that true? This broken user is correctly shown using "getent passwd
> > > <NEW username>"? Is that true?
> > >
> > > Can you use that user on system side, I would try, as root, "su -
> > > <NEW username>". This last test is to verify all is well configured
> > > about that user with new name. If it complains about missing home
> > > directory or anything else, that could be the cause SSH refuse to
> > > let that user connect on the system.
> > >
> > >
> > >
> > > 2016-09-06 11:36 GMT+02:00 Rowland Penny via samba
> > > <samba at lists.samba.org<mailto:samba at lists.samba.org>>: On Tue, 6
> Sep
> > > 2016 09:15:09 +0000 Julian Zielke via samba
> > > <samba at lists.samba.org<mailto:samba at lists.samba.org>> wrote:
> > >
> > > > Hi Mathias,
> > > >
> > > > thanks for your advice on how to use getent. However you’re
> > > > mentioning SSSD which is working fine. I was referring to it
> > > > because we changed to that method lately but the server having the
> > > > problem is NOT using this new method but the old winbind+samba
> combination.
> > > >
> > > > Sorry it it was confusing.
> > > >
> > > > Cheers,
> > > > Julian
> > >
> > > If you are using a fairly recent version of sssd, you are using a
> > > version of a Samba winbind lib, so just changing to sssd shouldn't
> > > give problems.
> > >
> > > First and foremost, all your users & groups are stored in AD as
> > > windows users & groups i.e. they have a SID-RID So if you change a
> > > login name, it shouldn't affect anything else, so when I asked how
> > > you changed the login name, perhaps I should have asked, what did
> > > you change ?
> > >
> > > Rowland
> > >
> >
> > As you don't seem to want to answer my question, I will tell you what
> > I think is going on.
> >
> > lets take a user called 'Test User' who is a member of a group called
> > 'A Group', if you examine their object in AD, You will find something
> > like this:
> >
> > user cn=Test User,CN=Users,DC=samdom,DC=example,DC=com
> > samaccountname: test
> > ........
> > memberOf: CN=A Group,CN=Users,DC=samdom,DC=example,DC=com
> >
> > If you also examine the groups object:
> >
> > dn: CN=A Group,CN=Users,DC=samdom,DC=example,DC=com
> > .......
> > member: CN=Test User,CN=Users,DC=samdom,DC=example,DC=com
> >
> > If you now change 'Test Users' name to 'Someone Else', you will also
> > change various other things:
> >
> > user cn=Someone Else,CN=Users,DC=samdom,DC=example,DC=com
> > samaccountname: someone
> > ........
> > memberOf: CN=A Group,CN=Users,DC=samdom,DC=example,DC=com
> >
> > But I do not think you will change the 'member' line in the groups
> > object, it will still refer to 'Test User', who doesn't exist any more.
> > This means that 'Someone Else' isn't a member of 'A Group', even
> > though the users object contains a 'memberOf' attribute that says they are.
> >
> > Is this what is going on in your AD ???
> >
> > Rowland
> >
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