By analogy with #1777, it would be useful to support an AuthorizedKeysCommand as an alternative (or supplement?) to AuthorizedKeysFile to allow for out-of-process plugins to handle remote user public key authentication. AuthorizedKeysCommand should probably handle both authentication and the various option strings currently available in AuthorizedKeysFile. I can try to produce a more thorough spec if it would be useful.
This is already implemented as a patch. *** This bug has been marked as a duplicate of bug 1663 ***
Move resolved bugs to CLOSED after 5.7 release