opnsense-ports/security/orthrus/pkg-message

Manually edit pam.d/* files as needed and add in the required auth line and
remove any undesired fallback lines. Also ensure you arent already using opie!"

example in pam.d/system :

auth            sufficient      pam_orthrus.so

Please remember to delete any such entry BEFORE deinstalling this port or you
could lock yourself out !!