Duo HOTP

Duo can authenticate using HOTP - Hash(message authentication code)-based One-Time Password.

But it has some proprietary covers over the OATH (Initiative for Open Authentication) standard.

simonseo/nyuad-spammer has code to work around this. duo.py is largely copied from there

Usage

also see duo.py -h or the doc string of duo.py

generate a new duo QR code for an android tablet within your institution's device management portal
copy the url of the QR code image . it should look like https://api-e4c9863e.duosecurity.com/frame/qr?value=c53Xoof7cFSOHGxtm69f-YXBpLWU0Yzk4NjNlLmR1b3NlY3VyaXR5LmNvbQ
./duo.py new 'https://URL-OF-IMAGE' to register
push continue in the browser
./duo.py next for future authentication

consider adding binding in sxkd, xbindkeys, etc for

duo.py next -s ~/secure/myinstitution_duo.json  | xclip -i

The default secret.json file is not encrypted! Be careful where you store it (see -s switch).
if you generate too many next calls w/out passing on to duo, you'll leave the validation window and duo will not authenticate.

pip install -r requirements.txt # pyotp docopt requests
./duo.py -h

testing is limited.

python -m doctest duo.py

duo.py is specific to duo's HOTP. For time based one time passwords (Google Authenticator, Microsoft Authenticator), look at oath-toolkit

KEY=$(zbarimg /path/to/qr-image.png)
oathtool --totp --base32 $KEY