2FA with SSH

[dgalligani]

Hello Rob,
many thanks for your work. I'm David, a sysadmin at a Scientific Investigation Center in Spain. I was wondering if I can use your code to implement 2FA with ssh instead of using Google's.

[RobThree]

You probably can, but that would require making a PAM module and I have no idea or experience with this. Sorry.

Out of curiosity: what's wrong with Google's? Why wouldn't you use it?

[willpower232]

I'd not recommend attempting this as Googles PAM module appears to be entirely self dependent, if you wrote a PAM module that used this PHP code to validate it and something went wrong with the PHP in your server, you could end up in a situation where you are not able to log in to your server.