Do multiple kerberos enabled services on a machine share the same ticket

[John Hascall]

> Hi,
> Do all services running on a server share the same long term key in the
> KDC.

They could in theory, but this is not how it is normally done.

> What I mean is, lets say on a server that is part of a domain that is
> running say a file server and a email server, both of which use the
> kerberos protocol...  Will a client wishing to communicate with both
> services be able to just use the same kerberos ticket?

If the user has a valid "TGT" ticket, the client can get the
service ticket it needs to authenticate with the server without
action from the user.  So, from this aspect, yes, get one TGT
and everything is good, but under the covers there are usually
separate tickets for each (service, server) pair.  For example:

> klist
Ticket cache: FILE:/var/dss/kerberos/tkt/v5_42db5d39085616
Default principal: john at IASTATE.EDU

Valid starting     Expires            Service principal
07/25/05 08:17:58  08/01/05 08:17:58  krbtgt/IASTATE.EDU at IASTATE.EDU
07/25/05 09:04:30  08/01/05 08:17:58  host/trusty.ait.iastate.edu at IASTATE.EDU
07/29/05 09:15:47  08/01/05 08:17:58  host/print-2.iastate.edu at IASTATE.EDU
07/30/05 17:54:20  08/01/05 08:17:58  accountd/moira.iastate.edu at IASTATE.EDU
07/30/05 17:54:44  08/01/05 08:17:58  accountd/lambda.it.iastate.edu at IASTATE.EDU


John