As a function of binding a Mac OS X machine to the domain, as of 10.4 and 
later, the directory service plug-in creates a /etc/krb5.keytab with service 
principals for the machine. Now, in theory, there are at least two services 
(neither of which are available at the moment), where the machine itself is the 
client and needs to authenticate itself to another machine: (1) Dynamic DNS via 
GSS-TSIG, and (2) other machines running IPsec via Kerberos-based IKE. If this 
were a user principal, I'd have thought I'd need a TGT for the user for which a 
service principal for the remote machine (either a DNS box or a IPsec-running 
peer) in order to perform the authentication, and then subsequently have to 
renew and/or refresh the TGT as it neared or reached its expiration date so as 
to continue to perform these operations over time (as a service).

In the keytab world, do you still have to get a TGT for the machine in order to 
get a service ticket for the remote machines? Can you get it directly via the 
keytab without entering a password? Or can you go directly from keytab to 
remote machine service ticket without having to deal with a TGT?

(And furthermore, if there's publicly available documentation and/or web 
references that describe this, I'd appreciate a pointer.)

-nh

--
Nathan Herring
CoreCLR SDE/Development
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