[Samba] Winbind / Samba auth problem after username change

Julian Zielke jzielke at next-level-integration.com
Tue Sep 6 12:28:51 UTC 2016

OK, I've used Apache Directory studio to examine your hint but the User object has the new name and the group the user is in had the users proper DN string.
So the change seems to be correct on the DCs part.

-----Ursprüngliche Nachricht-----
Von: Julian Zielke
Gesendet: Dienstag, 6. September 2016 14:19
An: 'Rowland Penny' <rpenny at samba.org>
Cc: samba at lists.samba.org
Betreff: AW: [Samba] Winbind / Samba auth problem after username change

Huh? I did answer you on your question what we have changed:

-----Ursprüngliche Nachricht-----
Von: Julian Zielke
Gesendet: Dienstag, 6. September 2016 12:57
An: samba at lists.samba.org
Betreff: AW: [Samba] Winbind / Samba auth problem after username change

Well we've changed the logon name (SAMAccountName) and the Name and Surname of the user object.

Or was there any other question I probably see by the amount of quotes?


-----Ursprüngliche Nachricht-----
Von: samba [mailto:samba-bounces at lists.samba.org] Im Auftrag von Rowland Penny via samba
Gesendet: Dienstag, 6. September 2016 13:55
An: samba at lists.samba.org
Betreff: Re: [Samba] Winbind / Samba auth problem after username change

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 ???


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