[SSSD-users] ddns updates not required?

Longina Przybyszewska longina at sdu.dk
Tue Jun 10 08:37:08 UTC 2014

What about NFS protocol?
Server used to check client's identity in reverse DNS addresses.


-----Original Message-----
From: sssd-users-bounces at lists.fedorahosted.org [mailto:sssd-users-bounces at lists.fedorahosted.org] On Behalf Of Simo Sorce
Sent: 8. juni 2014 19:45
To: End-user discussions about the System Security Services Daemon
Subject: Re: [SSSD-users] ddns updates not required?

On Sun, 2014-06-08 at 12:15 +0200, steve wrote:
> On Sat, 2014-06-07 at 18:49 +0100, John Hodrien wrote:
> > On 7 Jun 2014 18:38, steve <steve at steve-ss.com> wrote:
> > > Hi
> > > Thanks.
> > > Yes, same here. Even though bind allows the signed updates from 
> > > sssd, we don't need them. We can authenticate using sssd no matter 
> > > what IP is assigned and no matter what is stored in AD. Maybe the 
> > > ddns requirement could be removed from the default ad-backend?
> > 
> > You can hijack a keytab from another machine and use it for sssd, so correct DNS really doesn't matter for pure sssd operation.  You'll only cause bother for things using kerberos auth as a service (say samba/http/NFS/SSH), which if you like such things is a big deal.
> It doesn't seem to matter either. sssd autofs cifs works fine 
> irrespective of dns.

The reason why DNS updates matter is that if your client ever needs to be a *server*, then you want to be able to actually "find" it.

Think laptops that expose SSH in order to be accessed for admin purposes.

If your client never exposes any services/never needs to be contacted from a remote party and use Kerberos as authentication then it is not strictly required to update the DNS, though it is nice to know the right addresses.

We do enable it by default because in some environment DNS-scrubbing is used, ie if the client doesn't update the DNS for long enough it is considered old and the whole computer account may be nuked.


Simo Sorce * Red Hat, Inc * New York

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