django-u2f 0.3.0

FIDO U2F security token support for Django

django-u2f provides support for FIDO U2F security tokens in Django. The functionality is similar to the Security Key two-factor authentication that Google recently announced, and uses the same tokens.

django-u2f isn’t yet production ready, but is a working proof of concept. There are many TODOs sprinkled around the code that should be fixed before relying on it.

Installation

$ pip install django-u2f

Add django_u2f to INSTALLED_APPS and include django_u2f.urls somewhere in your url patterns. Set LOGIN_URL = 'u2f:login'. Make sure that Django’s built in login view does not not have a urlpattern, because it will authenticate users without their second factor. django-u2f provides its own login view to handle that.

Demo

To see a demo, use the test project included in the repo. Install django-u2f with pip install -e ., then install the demo-specific requirements with cd testproj; pip install -r requirements.txt. Run syncdb and create a user, create a self-signed certificate with ./mkcert.sh, then start ./manage.py runserver_plus --cert localhost.

For now the only supported browser is Chrome, version 41 or higher. U2F also requires that the page is served over a secure connection.

Start by going to https://localhost:8000/u2f/login. Since you haven’t added any security keys yet, you will be logged in with just a username and password. Once logged in, click ‘Add another key’ on the key management page and follow the instructions. Now your account is protected by two factor authentication, and when you log in again your U2F token will be required.

You can administrate the keys attached to your account on the key management page as well, at the URL https://localhost:8000/u2f/keys.

Using U2F keys on linux

Some distros don’t come with udev rules to make USB HID /dev/ nodes accessible to normal users. If your key doesn’t light up and start flashing when you expect it to, this might be what is happening. See https://github.com/Yubico/libu2f-host/issues/2 and https://github.com/Yubico/libu2f-host/blob/master/70-u2f.rules for some discussion of the rule to make it accessible. If you just want a quick temporary fix, you can run sudo chmod 666 /dev/hidraw* every time after you plug in your key (The files disappear after unplugging).

Helpful links

• The code to actually implement the crypto in python: https://github.com/Yubico/python-u2flib-server

• A description of the process from a developer’s perspective from Yubico: https://developers.yubico.com/U2F/Libraries/Using_a_library.html