Java Kerberos GSS-API mechanism checks for permissions during
following steps:

1) Credential acquisition
   ServicePermission checks.
2) Context establishment
   ServicePermission checks.
3) Credential delegation.
   DelegationPermission checks

ServicePermission is used to protect Kerberos services and the
credentials necessary to access those services.

DelegationPermission is used to restrict the usage of the Kerberos
delegated credentials.

Native GSS provider should apply same permission checks when using Kerberos.

###@###.### 2005-06-23 20:32:12 GMT