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Django Authentication for Okta OpenID

Project description

Django Okta Auth

Overview

Django Okta Auth is a library that acts as a client for the Okta OpenID Connect provider.

The library provides a set of views for login, logout and callback, an auth backend for authentication, a middleware for token verification in requests, and a decorator that can be selectively applied to individual views.

It's heavily influenced by okta-django-samples but there's a few fundamental changes and further implementation of things like refresh tokens which weren't initially implemented.

This project is in no way affiliated with Okta.

Installation

Install from PyPI:

pip install django-okta-auth

Configuration

Install the App

Add okta_oauth2.apps.OktaOauth2Config to INSTALLED_APPS:

INSTALLED_APPS = (
    "...",
    'okta_oauth2.apps.OktaOauth2Config',
    "..."
)

Authentication Backend

You will need to install the authentication backend. This extends Django's default ModelBackend which uses the configured database for user storage, but overrides the authenticate method to accept the auth_code returned by Okta's /authorize API endpoint as documented here.

The Authentication Backend should be configured as so:

AUTHENTICATION_BACKENDS = ("okta_oauth2.backend.OktaBackend",)

Using the middleware

You can use the middleware to check for valid tokens during ever refresh and automatically refresh tokens when they expire. By using the middleware you are defaulting to requiring authentication on all your views unless they have been marked as public in PUBLIC_NAMED_URLS or PUBLIC_URLS.

The order of middleware is important and the OktaMiddleware must be below the SessionMiddleware and AuthenticationMiddleware to ensure that the session and the user are both on the request:

MIDDLEWARE = (
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'okta_oauth2.middleware.OktaMiddleware'
)

Using the decorator

The alternative to using the middleware is to selectively apply the okta_oauth2.decorators.okta_login_required decorator to views you wish to protect. When the view is accessed the decorator will check that valid tokens exist on the session, and if they don't then it will redirect to the login.

The decorator is applied to a view like so:

from okta_oauth2.decorators import okta_login_required

@okta_login_required
def decorated_view(request):
    return HttpResponse("i am a protected view")

Update urls.py

Add the django-okta-auth views to your urls.py. This will provide the login, logout and callback views which are required by the login flows.

from django.urls import include, path

urlpatterns = [
    path('accounts/', include(("okta_oauth2.urls", "okta_oauth2"), namespace="okta_oauth2")),
]

Setup your Okta Application

In the Okta admin console create your application with the following steps:

  1. Click Create New App
  2. Choose the Web platform
  3. Choose the OpenID Connect Sign on method
  4. Click the Create button
  5. Give the application a name and choose a logo if desired
  6. Add the URL to the login view as defined in the previous section, eg. http://localhost:8000/accounts/login/
  7. Click the Save button
  8. In the General Settings of the application click edit and check Authorization Code and the Refresh Token under Allowed grant types.
  9. Save the settings
  10. Take note of the Client ID and the Client secret in the Client Credentials for use in the next section. It is important to note that the Client secret is confidential and under no circumstances should be exposed publicly.

Django Okta Settings

Django Okta Auth settings should be specified in your django settings.py as follows:

OKTA_AUTH = {
    "ORG_URL": "https://your-org.okta.com/",
    "ISSUER": "https://your-org.okta.com/oauth2/default",
    "CLIENT_ID": "yourclientid",
    "CLIENT_SECRET": "yourclientsecret",
    "SCOPES": "openid profile email offline_access", # this is the default and can be omitted
    "REDIRECT_URI": "http://localhost:8000/accounts/oauth2/callback",
    "LOGIN_REDIRECT_URL": "/", # default
    "CACHE_PREFIX": "okta", # default
    "CACHE_ALIAS": "default", # default
    "PUBLIC_NAMED_URLS": (), # default
    "PUBLIC_URLS": (), # default
    "USE_USERNAME": False, # default
}

Login Template

The login view will render the okta_oauth2/login.html template. It will be passed the following information in the config template context variable:

{
    "clientId": settings.OKTA_AUTH["CLIENT_ID"],
    "url": settings.OKTA_AUTH["ORG_URL"],
    "redirectUri": settings.OKTA_AUTH["REDIRECT_URI"],
    "scope": settings.OKTA_AUTH["SCOPES"],
    "issuer": settings.OKTA_AUTH["ISSUER"]
}

The easiest way to use this is to implement the Okta Sign-In Widget in your template.

A minimal template for the login could be:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <script
      src="https://global.oktacdn.com/okta-signin-widget/5.0.1/js/okta-sign-in.min.js"
      type="text/javascript"
    ></script>
    <link
      href="https://global.oktacdn.com/okta-signin-widget/5.0.1/css/okta-sign-in.min.css"
      type="text/css"
      rel="stylesheet"
    />
  </head>
  <body>
    <div id="okta-login-container"></div>

    <script type="text/javascript">
      var oktaSignIn = new OktaSignIn({
          baseUrl: '{{config.url}}',
          clientId: '{{config.clientId}}',
          redirectUri: '{{config.redirectUri}}',
          authParams: {
              issuer: '{{config.issuer}}',
              responseType: ['code'],
              scopes: "{{config.scope}}".split(" "),
              pkce: false,
          },
      });
      oktaSignIn.renderEl(
          {el: '#okta-login-container'},
          function (res) {
              console.log(res);
          }
    </script>
  </body>
</html>

Settings Reference

ORG_URL:

str. URL Okta provides for your organization account. This is the URL that you log in to for the admin panel, minus the -admin. eg, if your admin URL is https://myorg-admin.okta.com/ then your ORG_URL should be: https://myorg.okta.com/

ISSUER

str. This is the URL for your Authorization Server. If you're using the default authorization server then this will be: https://{ORG_URL}/oauth2/default

CLIENT_ID

str. The Client ID provided by your Okta Application.

CLIENT_SECRET

str. The Client Secret provided by your Okta Application.

SCOPES

str. The scopes requested from the OpenID Authorization server. At the very least this needs to be "openid profile email" but if you want to use refresh tokens you will need "openid profile email offline_access". This is the default.

If you want Okta to manage your groups then you should also include groups in your scopes.

REDIRECT_URI

str. This is the URL to the callback view that the okta Sign-In Widget will redirect the browser to after the username and password have been authorized. If the directions in the urls.py section of the documentation were followed and your django server is running on localhost:8000 then this will be: http://localhost:8000/accounts/callback/

LOGIN_REDIRECT_URL

str. This is the URL to redirect to from the callback after a successful login. Defaults to /.

CACHE_PREFIX

str. The application will utilise the django cache to store public keys requested from Okta in an effort to minimise network round-trips and speed up authorization. This setting will control the prefix for the cache keys. Defaults to okta.

CACHE_ALIAS

str. Specify which django cache should be utilised for storing public keys. Defaults to default.

PUBLIC_NAMED_URLS

List[str]. A list or tuple of URL names that should be accessible without tokens. If you add a URL in this setting the middleware won't check for tokens. Default is: []

PUBLIC_URLS

List[str]. A list or tuple of URL regular expressions that should be accessible without tokens. If you add a regex in this setting the middleware won't check matching paths for tokens. Default is [].

SUPERUSER_GROUP

str. Members of this group will have the django is_superuser user flags set.

STAFF_GROUP

str. Members of this group will have the django is_staff user flags set.

MANAGE_GROUPS

bool. If true the authentication backend will manage django groups for you.

USE_USERNAME

bool. If true the authentication backend will lookup django users by username rather than email.

License

MIT License

Copyright (c) 2020 Matt Magin

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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