Maybe a little bit OT question here:
SPN vs UPN only exists in Microsoft KDC implementation right?
i.e. if I deploy IPA domain, there is still no difference between these 2 (as IPA is
using MIT KDC) right?
Thanks,
Ondrej
-----Original Message-----
From: Sumit Bose [mailto:sbose@redhat.com]
Sent: Tuesday, August 23, 2016 3:49 PM
To: sssd-users(a)lists.fedorahosted.org
Subject: [SSSD-users] Re: adcli --service-name="host" vs.
--user-principal=host/gentoo-lab.transmode.se(a)TRANSMODE.SE?
On Thu, Aug 18, 2016 at 08:48:37AM +0000, Joakim Tjernlund wrote:
Is there a difference between the above two options?
yes, there is. Only with user principal you can get ticket granting tickets (TGTs). So
only those can be used with kinit or for login.
Service principals are used to identify services, e.g. if a user wants to access the LDAP
service he needs a service ticket for the service
ldap/ldap-server.example.com(a)EXAMPLE.COM.
Also, I have always wondered why there is two version of ever service as in:
host/GENTOO-LAB(a)TRANSMODE.SE
vs.
host/gentoo-lab.transmode.se(a)TRANSMODE.SE
This is afaik some shortcut for Windows/AD environments. In general Kerberos relies on DNS
and hence host/gentoo-lab.transmode.se(a)TRANSMODE.SE is all you need. For compatibility AD
still supports a different kind of names called NetBIOS names. Typically the NetBIOS name
is just the first part of the DNS name in upper-case. But there is not general rule for
this and due to some restrictions on either side (NetBIOS names can only be 15 bytes long,
but may contain '.') it is even not always possible to find the matching name in
the other scheme. Since the Windows users are used to the NetBIOS names AD supports them
in the service principals as well.
HTH
bye,
Sumit
Jocke
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