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
Also, I have always wondered why there is two version of ever service as in:
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.
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