django-vouch-proxy-auth

Django Middleware enabling the use of the Vouch Proxy cookie for single sign-on.

This package subclasses Django's RemoteUserMiddleware and RemoteUserBackend.

How it Works

1. The middleware checks for the presence of the Vouch Proxy cookie.
2. If the cookie exists, it attempts to load a previous validation from Django cache.
3. If the validation result is not in the Cache, send the contents of the VouchCookie cookie to the Vouch Proxy /validate endpoint.
4. If the validation is successful, decode and decompress the cookie and extract the username from the JWT payload.
5. Save the username in cache with a short expiration and use the SHA256 sum of the VouchCookie as the key. (i.e. VouchCookie_ + sha256sum(VouchCookie))

Installation and Usage

pip install django-vouch-proxy-auth or add django-vouch-proxy-auth to your requirements file.

To enable the middleware, add django_vouch_proxy_auth.middleware.VouchProxyMiddleware after Django's AuthenticationMiddleware.

MIDDLEWARE = [
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    ...
    'django_vouch_proxy_auth.middleware.VouchProxyMiddleware'
]

This middleware is also dependent on the VouchProxyUserBackend Authentication Backend. Add anywhere in your AUTHENTICATION_BACKENDS.

AUTHENTICATION_BACKENDS = (
    'django_vouch_proxy_auth.backends.VouchProxyUserBackend'
)

Finally, you MUST tell the middleware where the /validate endpoint is. Add the VOUCH_PROXY_VALIDATE_ENDPOINT to your Django settings.py file.

VOUCH_PROXY_VALIDATE_ENDPOINT = 'https://login.avacado.lol/validate'

Settings

VOUCH_PROXY_VALIDATE_ENDPOINT

Location of the Vouch Proxy validation endpoint. You MUST provide this value, or the Middleware will raise an ImproperlyConfigured exception.

VOUCH_PROXY_VERIFY_SSL

Default: True

Set this to False to ignore verification of the Vouch Proxy SSL certificate.

VOUCH_PROXY_COOKIE_NAME

Default: VouchCookie

Change this setting if you are using a custom Vouch Proxy cookie name.

VOUCH_PROXY_CACHE_TIMEOUT

Default: 300 (seconds)

This middleware will cache the username if a successful response from the /validate query is returned. To reduce the load on Vouch Proxy, the middleware will only validate the cookie every 300 seconds (5 minutes) by default.

Set this value to a positive integer if you want to change the cache timeout.

Set this to 0 if you want Django to query the Vouch Proxy /validate endpoint on every request.

VOUCH_PROXY_CACHE_PREFIX

Default: defaults to the configured value for VOUCH_PROXY_COOKIE_NAME plus underscore (i.e. VouchCookie_)

Set this value if you want to change the prefix for the CacheKey.

VOUCH_PROXY_CACHE_BACKEND

Default: default

Set this value if you want to store cached results in a different cache.

VOUCH_PROXY_DISABLED_PATHS

Default: []

Set this value (as an array) to full paths that you want to disable the middleware.

For example, if you have other middleware that causes conflict:

VOUCH_PROXY_DISABLED_PATHS = ['/oidc/authenticate/', '/oidc/callback/']

VOUCH_PROXY_CREATE_UNKNOWN_USER

Default: True

Set this to False if you do not want the middleware to automatically create a user entry on first login. You must use the

VOUCH_PROXY_FORCE_LOGOUT_IF_NO_COOKIE

Default: False

Set this to True if you want Django to logout the user if the Vouch Cookie is not present.