# Uses google authenticator library as PAM module using a single folder for all users tokens
# User root is required to stick with an hardcoded user when trying to determine user id and allow unexisting system users
# See https://github.com/google/google-authenticator-libpam#usersome-user
auth required pam_google_authenticator.so secret=/etc/openvpn/otp/${USER}.google_authenticator user=root authtok_prompt=pin

# Accept any user since we're dealing with virtual users there's no need to have a system account (pam_unix.so)
account sufficient pam_permit.so