Add option for user authentication when using sudo

[DonFlymoor]

I've had to disable howdy being able to authenticate as root, because I was afraid that some malicious application would gain root privileges that way.
What happens:

user@computer:~$ sudo su
... howdy athenticates ...
root@computer:/home/user#

The webcam turns on, and when face verification succeeds, it logs on as root. This has serious security implications, as malicious program could easily gain root privileges, possibly without the user noticing.

This is what I would like to see on the command line:

user@computer:~$ sudo echo "testing"
Do you wish to allow echo to be run as root [y/n]:y
... howdy athenticates ...
testing

And when the command is not run in the terminal a popup should appear, although I think that may already happen.