[Feature Request] - Support PAM Keyboard Interactive Authentication

[Alex-Muirhead]

Description

I would love to use termscp with my remote cluster at my university, however they've recently added a 2FA keyboard challenge when connecting via SSH (or others).

Once an SSH connection attempt is started, an interactive keyboard prompt will ask the user to enter a one-time-password. This step currently can't be handled by termscp (as far as I can tell from reading and poking).

Changes

It would be great if termscp could detect if a prompt was being requested, and create a pop-up prompt (or similar) that forwarded the prompt onto the user. Once the OTP is entered, the connection continues.

Implementation

I don't know exactly how to integrate it, but I've seen that the used ssh2 has a function for userauth_keyboard_interactive, which might solve the problem.