75. Django integrates CAS to realize SSO single sign on

Fisherman of Devops ocean 2020-11-17 13:58:42
django integrates cas realize sso


In the development of the company's platform , With more and more internal platforms , The platform we need to develop needs to synchronize with the company's OA account number .

So how to synchronize ? To put it simply, it is to adopt CAS Service mechanism , Realization CAS Services to complete multi application single sign on function .


In understanding CAS Before single sign on , Let's review Django default Session + Cookie Landing mechanism of :

  1. The browser sends a login request to Django service
  2. Django Service received After the request sent by the browser , Create CSRFToken as well as Related user information , Store in Session in , And back to the browser Set-Cookie Information about , Notification browser settings related Cookie
  3. The browser sends the request again to Django service , It will carry the previous settings Cookie Information
  4. Django Service received After the request sent by the browser , I found that I was carrying CSRFToken as well as Recording user information sessionID, according to sessionID Query the server for session data .

Let's see next CAS Single sign on Mechanism of .

CAS Of (Single Sign-On)SSO Single sign on mechanism

First of all, don't look at CAS A bunch of concepts , We go straight to the sequence diagram , Understand the request CAS For the service login authentication process, first .

CAS Login service request sequence diagram

cas Login mechanism -CAS Service login mechanism

From the sequence diagram above , It is clear that CAS Service is used for unified management APP Service login authentication Independent service . In the sequence diagram, I wrote 16 Processing steps , Here 16 Of the processing steps , You can know ,APP service And CAS Service validation login is based on Service ticket ST To confirm .

The basic certification process is as follows :

  • Front end access APP A page of services , At this time, no relevant login parameters are carried .
  • The back end found that the request was not logged in , Then back to the front end 302 , and Redirect to CAS Server login page , And carry the link to the web page visited by the current user
  • stay CAS Server , The user fills in the login information , Browser sends request to CAS The server authenticates
  • CAS service Certification by , Save this login to session , return Service ticket ST and Redirect Browser to APP service
  • APP The service receives the front-end redirection request route as well as Service ticket ST ,APP service then Service ticket ST Request to CAS service , verification ST. Verification passed , Then create the user to login successfully session data ; conversely , return front end 302, Redirect to CAS Landing page .
  • APP Service validation ST After passing , return front end Landing page The page content .

It's clear CAS After logging in to the service request mechanism , Let's start setting up the service , Set up a complete CAS service .

CAS Sample Services


explain : This example service code creates a CAS Server side project , Create another CAS Client's project , Complete with two projects CAS Service login mechanism .

Related to the use of the library Github Address

  • https://github.com/jbittel/django-mama-cas
  • https://django-mama-cas.readthedocs.io/en/latest/
  • https://github.com/django-cas-ng/django-cas-ng

CAS Server project

install Django

$ pip install Django==2.1.7

Because at present, online operation is 2.1.7 Version of , It hasn't been changed to 3.x Series version , So this time we use 2.1.7 To demonstrate .

establish Django project

$ django-admin startproject django_cas_server .


Test startup Django project

$ python manage.py runserver


The visit page is as follows :


Out of Service , Start installation django-mama-cas library .

install django-mama-cas

$ pip install django-mama-cas

To configure settings, install mama-cas application

'mama_cas', # install mama_cas application


To configure url, Set access cas Routing of services

from django.contrib import admin
from django.urls import path, include
urlpatterns = [
path('cas/', include('mama_cas.urls')), # Import mama_cas Applied urls.py
path('admin/', admin.site.urls),


stay settings To configure CAS Callback :

Official website sample configuration :

'SERVICE': '^https://[^\.]+\.example\.com',
'LOGOUT_URL': 'https://www.example.com/logout',
'PROXY_PATTERN': '^https://proxy\.example\.com',

This project configuration :

# To configure CAS
# mandatory , The domain name the client is allowed to access
'SERVICE': '',
# Callback mode , Refer to official documents for details


Initialize the table

$ python manage.py migrate

Start the service

$ python manage.py runserver

I don't occupy it here 8000 Port number , Open for 3000 Port number as cas service .

visit CAS Landing page



So the account number 、 What should I fill in the password ?

Actually, it depends on Django Of User The table already stores registered and activated users . ad locum , Let's create a admin Of The super user , As CAS Users of .

Create a superuser

$ python manage.py createsuperuser
Username (leave blank to use 'lijw'): casuser01
Email address:
Password (again):
This password is too short. It must contain at least 8 characters.
This password is too common.
This password is entirely numeric.
Bypass password validation and create user anyway? [y/N]: y
Superuser created successfully.

land CAS service


It indicates that you have successfully logged in , it is to be noted that , There's no other configuration here , So it doesn't jump to other pages . It's just that the login is successful !

CAS Of Test user :casuser01 password :123456

If login fails , It will prompt as follows :


CAS Client project

Let's start with a project , And then access CAS service .

Get the client project ready

First, prepare a simple client project for demonstration , First of all, it has the following three view functions :

  • register : It is used to add new users
  • land : Login project new users
  • home page : Used to demonstrate the view page after successful login .

Registration page


This page I only realized the most basic information , And then click register Button to register , If the registration is successful, it will automatically jump to the landing page .

Landing page


On the landing page , I've provided fill in users 、 Password and verification code , Then click the login button function .

Here's one I registered myself The test user is : testuser01 password :123456

 it is to be noted that : This user is the data registered in this project , Follow up docking CAS , To use CAS Users of the project . ”

After landing successfully , Then go to index The page is as follows :


install CAS Of Client library

stay python For in the cas Of client There are many open source libraries for client functions . for example :

  • python-cas:https://github.com/python-cas/python-cas
  • django-cas-ng: https://github.com/django-cas-ng/django-cas-ng

Because my project uses django frame , So install django-cas-ng that will do .

django-cas-ng Installation documentation for :https://djangocas.dev/docs/latest/install.html


Use pip install :

pip install django-cas-ng

Configuration items use CAS The client of

In the project's configuration file settings.py Add the following configuration .

Refer to the configuration document on the official website :https://djangocas.dev/docs/latest/configuration.html


To configure INSTALLED_APPS, install CAS application

'user.apps.UserConfig', # register user application
'django_cas_ng', # install cas Client applications

To configure MIDDLEWARE_CLASSES, Set up CAS The middleware class of the client

'django_cas_ng.middleware.CASMiddleware', # Set up cas The middleware class of the client

To configure AUTHENTICATION_BACKENDS , Specify the back end of Authentication Authorization

# Specify the back end of authorization authentication

Configure ready to access CAS Service address and version , Add several corresponding configurations :

# CAS Service access address
# CAS edition
# Deposit all CAS Returned by the server User data .

To configure CAS client visit CAS Service view page URL

Example configuration of official website :

# Django 2.0+
from django.urls import path
import django_cas_ng.views
urlpatterns = [
# ...
path('accounts/login', django_cas_ng.views.LoginView.as_view(), name='cas_ng_login'),
path('accounts/logout', django_cas_ng.views.LogoutView.as_view(), name='cas_ng_logout'),

Configure item routing urls.py as follows :

from django.contrib import admin
from django.urls import path, include
import django_cas_ng.views # Import cas Login view of
urlpatterns = [
# path('user/', include('user.urls')), # Import user Applied urls.py
path('', include('user.urls')), # Import user Applied urls.py
path('cas/login', django_cas_ng.views.LoginView.as_view(), name='cas_ng_login'), # visit cas Service landing
path('cas/logout', django_cas_ng.views.LogoutView.as_view(), name='cas_ng_logout'), # visit cas Logout of service
path('admin/', admin.site.urls),

explain : That is to say, after configuring these two paths , The specific operation process is as follows :

  • Access client services : Judge if the service is not logged in , Automatically redirect to It's configured in the background CAS service , And then in cas After successful login to the server , Redirect back to the client service .
  • Access client services :, Automatically redirect to It's configured in the background CAS service, be Log out of user .

initialization django_cas_ng Related data table of

You have 1 unapplied migration(s). Your project may not work properly until you apply the migrations for app(s): django_cas_ng.
Run 'python manage.py migrate' to apply them.
$ python manage.py migrate

Start the client service

$ python manage.py runserver

Test client access CAS service

  • 1. visit , Landing user


Automatically redirect to CAS The service is as follows :


After landing successfully , The services returned to the client are as follows :


  • 2. visit Exit login status

After the visit , Automatically redirect to not logged in :



  • 1. Successful visit CAS service , After logging in the user , By configuring , Users can be automatically synchronized in the user data of the client project

By means of settings.py Configure automatic synchronization of user data :

# Deposit all CAS Returned by the server User data .

After landing successfully , You can query the successful login user data , as follows :


  • 2. Sync CAS The other fields of the user are set by default , for example : Roles are set by default

First make sure , I define the role field defaults for the user model class , as follows :


Inquire about CAS Synchronize users Of Character data :

In [13]: User.objects.get(username="casuser01").role
Out[13]: 0
In [14]: User.objects.get(username="casuser01").get_role_display()
Out[14]: ' Team members '
  • 3. You can keep two landing pages

because Client project login and CAS Service landing It's through different url Access to the , And you can set the login status .

in other words , I can set up different login visits in one page , as follows :


Click on CAS land , It is shown as follows :



  • 4. In the login view of the project , Add user login status judgment , If you have landed , Direct redirection to the home page


 def get(self, request):
# get Request to return to the login page
# Determine whether the user has logged in
# Get the current user
user = request.user # Get the current user
# Determine whether the user has logged in
if user.is_authenticated: # The user has logged in , Then jump to the front page
return redirect('user:index')
# The user is not logged in , Enter the landing page
return render(request, "user/login.html")
  • 5. land 、 User data 、RBAC The solution strategy of

From the above process of trying , Can confirm Client project It is possible to keep Two types of login users The way of , And the user data in both ways will be saved in In the client project .

Users who are synchronized will use the default role field , So in configuration RBAC When , Directly configure the menu that can be displayed according to the default role .

In fact, it is doing RBAC Function development Do not accept CAS User impact ,CAS Users just add a way to log in .

  • 6. Client side adoption http service , You can configure the https Of CAS service

At the beginning, I was worried about http Can the client service of docking https Of CAS service , It can .

The warehouse address of the demo project

  • CAS Server side demo project :https://gitee.com/kubernete/django_cas_server
  • CAS Client demo project :https://gitee.com/kubernete/django_cas_client

This article is from WeChat official account. - Fisherman of the sea (DevOpsFreshMan) , author :Devops Fisherman of the sea

The source and reprint of the original text are detailed in the text , If there is any infringement , Please contact the [email protected] Delete .

Original publication time : 2020-11-11

Participation of this paper Tencent cloud media sharing plan , You are welcome to join us , share .

本文为[Fisherman of Devops ocean]所创,转载请带上原文链接,感谢

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