Adding pam-u2f support to replace yubikey auth
I've recently bought a solokey which supports U2F. I was hoping to be able to use it to easily log into my vpn, and it looks like the best place to start would be to implement pam-u2f support here. The yubikey library currently used is in maintenance mode and is restricted to only being used with yubikey, whereas supporting u2f would add support for a wider variety of hardware keys, including yubikey. I wanted to post this issue to ask if adding this would make sense.