Can a single Kerberos Keytab file hold multiple principals?

Hi
I have a situation where I have multiple keytab files (different principal accounts) and my application is going to use these different service
principal accounts and connect to one or more Oracle databases (all kerberos enabled). Can I maintain only one keytab (merging all into one)in my application environment?
If I merge all keytabs into one using kutil and issue kinit (or okinit) using keytab and service principal, I could see the command runs successful and see
the cache credentials getting updated. But I am not sure if the single cache file is actually storing tickets for all the principals. When I issue klist (or oklist),
I could only see the last issued service principal's ticket.
Do we ever put more than one principal in a single keytab file and maintain it in an application env? If not, why there is an option to merge keytab files? only to be used in kdc may be?
The reason why I want to maintain one keytab is, my applications rely on Oracle OCI thick driver (sqlnet.ora) and I cant maintain multiple keytab files and multiple sqlnet.ora,
as sqlnet.ora cannot be switched or changed in runtime.
I know I am missing something here, perhaps a flaw in my application design using more than one service account at first place?
Please give me some directions, I dont find the right forum where I get my queries answered. Thanks in advance.
-Srivatsan Nallazhagappan
Edited by: 989781 on Apr 8, 2013 7:43 PM
Edited by: 989781 on Apr 8, 2013 8:05 PM

Hi,
The application is not written in Java, but in C++ which uses Oracle OCI thick driver and not JAAS like thin driver. With Oracle OCI thick driver within a running process, you can connect to Oracle database with only one Kerberos principal, and switching between principals is not supported.
For example, once you login to sqlplus /@<TNS-Service> using a kerberos principal, you cannot connect with another principal within that same sqlplus session. (sqlplus uses Oracle's sqlnet which is a OCI thick driver )
I know JAAS does support because its thin but not OCI thick driver which loads the Oracle parameters during process boot up and can never refresh (atleast the sqlnet parameters)
I have changed my application to use only one service principal (provide all the required privileges for that principal to use the resources) .
Thanks
Srivatsan

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