ExposeAuthInfo=yes
AuthorizedKeysCommandUser=root
AuthorizedKeysCommand=/etc/ssh/AuthorizedKeysCommand %u %h %f "%t %k"

#          %u    The username.
#          %h    The home directory of the user.
#          %f    The fingerprint of the key or certificate.
#          %t    The key or certificate type.
#          %k    The base64-encoded key or certificate for authentication.