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openedx / auth-backends

Custom authentication backends and views for edX services
GNU Affero General Public License v3.0
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authentication edx oauth2 oidc openid-connect python

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This package contains custom authentication backends, views, and pipeline steps used by edX services for single sign-on.

This package is compatible with Python 3.8, Django 2.2 and Django 3.0

We currently support OAuth 2.0 authentication. Support for OpenID Connect (OIDC) was removed as of version 3.0. Use version 2.x if you require OIDC and are not able to migrate to OAuth2.

Installation

The auth_backends package can be installed from PyPI using pip::

$ pip install edx-auth-backends

Update INSTALLED_APPS:

.. code-block:: python

INSTALLED_APPS = (
    'social_django',
)

Configuration

Adding single sign-on/out support to a service requires a few changes:

  1. Define settings
  2. Add the authentication backend
  3. Add the login/logout redirects

OAuth 2.0 Settings

+----------------------------------------------------------+-------------------------------------------------------------------------------------------+
| Setting                                                  | Purpose                                                                                   |
+==========================================================+===========================================================================================+
| SOCIAL_AUTH_EDX_OAUTH2_KEY                               | Client key                                                                                |
+----------------------------------------------------------+-------------------------------------------------------------------------------------------+
| SOCIAL_AUTH_EDX_OAUTH2_SECRET                            | Client secret                                                                             |
+----------------------------------------------------------+-------------------------------------------------------------------------------------------+
| SOCIAL_AUTH_EDX_OAUTH2_URL_ROOT                          | LMS root, reachable from the application server                                           |
|                                                          | (e.g. https://courses.stage.edx.org or http://edx.devstack.lms:18000)                     |
+----------------------------------------------------------+-------------------------------------------------------------------------------------------+
| SOCIAL_AUTH_EDX_OAUTH2_PUBLIC_URL_ROOT                   | LMS root, reachable from the end user's browser                                           |
|                                                          | (e.g. https://courses.stage.edx.org or http://localhost:18000)                            |
+----------------------------------------------------------+-------------------------------------------------------------------------------------------+
| SOCIAL_AUTH_EDX_OAUTH2_JWS_HMAC_SIGNING_KEY              | (Optional) Shared secret for JWT signed with HS512 algorithm                              |
+----------------------------------------------------------+-------------------------------------------------------------------------------------------+
| SOCIAL_AUTH_EDX_OAUTH2_PROVIDER_CONFIGURATION_CACHE_TTL  | (Optional) Cache timeout for provider configuration. Defaults to 1 week.                  |
+----------------------------------------------------------+-------------------------------------------------------------------------------------------+
| SOCIAL_AUTH_EDX_OAUTH2_JWKS_CACHE_TTL                    | (Optional) Cache timeout for provider's JWKS key data. Defaults to 1 day.                 |
+----------------------------------------------------------+-------------------------------------------------------------------------------------------+

OAuth2 Applications require access to the ``user_id`` scope in order for the ``EdXOAuth2`` backend to work.  The backend will write the ``user_id`` into the social-auth extra_data, and can be accessed within the User model as follows::

    self.social_auth.first().extra_data[u'user_id']  # pylint: disable=no-member

Strategy

We use a custom strategy <http://python-social-auth.readthedocs.io/en/latest/strategies.html>_ that includes many of the default settings necessary to utilize single sign-on for edX services. This strategy should be used for all services to simplify configuration. If you need to override the defaults, you may still do so as you would with any social auth setting——prepend SOCIAL_AUTH_ to the setting name. Add the following to your Django settings to use the strategy:

.. code-block:: python

SOCIAL_AUTH_STRATEGY = 'auth_backends.strategies.EdxDjangoStrategy'

Authentication Backend

Configuring the backend is simply a matter of updating the ``AUTHENTICATION_BACKENDS`` setting. The configuration
below is sufficient for all edX services.

.. code-block:: python

    AUTHENTICATION_BACKENDS = (
        'auth_backends.backends.EdXOAuth2',
        'django.contrib.auth.backends.ModelBackend',
    )

Authentication Views

In order to make use of the authentication backend, your service's login/logout views need to be updated. The login view should be updated to redirect to the authentication provider's login page. The logout view should be updated to redirect to the authentication provider's logout page.

This package includes views and urlpatterns configured for OAuth 2.0. To use them, simply append/prepend oauth2_urlpatterns to your service's urlpatterns in urls.py.

.. code-block:: python

from auth_backends.urls import oauth2_urlpatterns

urlpatterns = oauth2_urlpatterns + [
    url(r'^admin/', include(admin.site.urls)),
    ...
]

It is recommended that you not modify the login view. If, however, you need to modify the logout view (to redirect to a different URL, for example), you can subclass EdxOAuth2LogoutView for the view and LogoutViewTestMixin for your tests.

Testing

Call make test.

Publishing a Release

After a PR merges, create a new tag from master branch with a new version of the package and create a Github release <https://github.com/openedx/auth-backends/releases>_ using the new tag that will automatically publish the package to PyPi when a release is created.

License

The code in this repository is licensed under the AGPL unless otherwise noted.

Please see LICENSE.txt for details.

How To Contribute

Contributions are very welcome!

Please read How To Contribute <https://github.com/openedx/.github/blob/master/CONTRIBUTING.md>_ for details.

Reporting Security Issues

Please do not report security issues in public. Please email security@openedx.org.

Mailing List and IRC Channel

You can discuss this code on the edx-code Google Group <https://groups.google.com/forum/#!forum/edx-code>_ or in the #edx-code IRC channel on Freenode.