basado en: https://www.entredevyops.es/posts/ssh-2fa.html
sudo
apt-get install -y libpam-google-authenticator
sudo nano /etc/pam.d/sshd
#y agregar
auth required pam_google_authenticator.so
sudo nano /etc/ssh/sshd_config
ChallengeResponseAuthentication
yes
sudo
service sshd restart
#al usuario al cual le quieres activar el 2FA
google-authenticator
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