Does MIT Kerberos KDC supports Constrained Delegation natively

[Yu Yu]

Dear friends,

Might I ask if MIT Kerberos KDC supports Constrained Delegation (S4U2Self
and S4U2Proxy) feature natively, or if additional back-end (for example,
LDAP) required for it?
I am new to Kerberos area, and could not find any documentation about this.
Please kindly let me know if the mail does not conform to the mail list
policy.
Thanks all in advance!

Regards,
Jonathan