I have a Java API that talks to the Kerberos server and performs various operations. As of now, my API requests for non-renewable tickets to the Kerberos server. From what I understand, the jaas config file has an option to set the renewTGT option to true so that a renewable ticket can be issued. However, Jaas seems to have a lot of restrictions on setting the "renewUntil" time. Can anyone please tell me how we can request for arenewable ticket and also control its renewability? Basically, is there a way we can perform a Java equivalent of the operation : kinit -R ? Thanks in advance.
Jaas - Requesting Renewable Kerberos Tickets
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As of JDK7 (1.7.0_55), JAAS
Krb5LoginModuledoes not provide any option to request a renewable TGT when authenticating, so this is not currently possible using JAAS. You might be able to achieve this, but you would need to use the internal Kerberos classes directly, bypassing JAAS.Internally,
Krb5LoginModuleinstantiates asun.security.krb5.KrbAsReqBuilderto obtain credentials using either a provided password, or a keyTab.KrbAsReqBuilderhas asetOptions(KDCOptions options)method, but this is not called in the login module. If it could be accessed, you could callKDCOptions#set(KDCOptions.RENEWABLE, true), and I would then expect the returned ticket to be renewable, if the KDC is configured to allow renewable tickets.