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There exists kernel functionality allowing a userspace daemon to determine the label on a key that is about to be created. It is called 'setkeycreatecon'
After the kernel adds support to allow for the label on keys to be determined by policy, sssd should make use of this (along with obviously knowledge of the label on the process expected to use the key [haha, maybe this is the hard part]) to make sure that keys is creates are done so in the right type.
This would stop sshd_t from needing to be able to manage sssd_t keys. As both would be allowed to manage user_key_t and sssd would be sure to create keys to be used by users in that type...
I think details and example code will only make sense after BZ 1072613 is complete.