YubiKey OTP login support through NFC

[isontheline]

Webssh asks me correctly for my OTP code during login, but doesn't have the option to use the code from my YubyKey via NFC.

Originally posted by @diegodelima in #1052

Related to #697

[isontheline]

For @isontheline work :

• https://github.com/Yubico/yubikit-ios

[isontheline]

Hi Arnaud,

Looks like Yubikey linux PAM module (pam_yubico.so) behaves very much like the pam_google_authenticator.so with the keyboard-interactive sshd Auth Method, except for the message:

@.*** % ssh @.***
@.) Verification code: (this is google auth)
@.) YubiKey for `me’: (this is yubikey)

WebSSH already shows the TEXT prompt for Yubikey correctly on screen (if I copy and paste the code from the computer it works). What’s missing is a NFC button there, one that calls the iOS layer to ask for it (I guess any NFC key would do the trick for debugging purposes).

I can beta test it with my Yubikey if you want.

[isontheline]

Now available on latest beta release : https://testflight.apple.com/join/QSrBK59z