Skip to main content

Part 1: Share Authentication Cookie - SSO (Single Sign-On) In Dotnet Core


Introduction:

Single Sign-On (SSO) is an authentication technique where the user uses one set of login credentials to access multiple web applications.

About Platform:

. Asp.net core MVC
. Microsoft Identity Login
. Dotnet core 2.2
. SQL LocalDB

Core Concept:

In the dotnet core, by sharing authentication cookie we can achieve SSO for the subdomains.

A subdomain is a domain which part of another domain.  Additional name prefixed to a domain that URL can be a subdomain. For example "http://testmyapp.com/" is a domain, its subdomain looks like "http://mobile.testmyapp.com".


Create MVC Application & LocalDB Setup To IIS & IIS Hosting:


Create an Asp.net MVC Core application by selecting a login individual user template from a visual studio. For this application use, LocalDB as a database then host this application to local IIS, bind "http://testmyapp.com" as domain and "http://mobile.testmyapp.com" as a domain to test sharing authentication cookie.

For hosting Asp.net Core application to localhost and binding domains click here for step by step process. While using LocalDB in IIS any issues click here to fix them.

Test Application Hosting In IIS:

After hosting the application successfully, navigate to the application using "http://testmyapp.com".


Here application uses Microsoft Asp.net Identity login by default. Now to test register and get logged in.

Now try to navigate the application using "http://mobile.testmyapp.com" subdomain where you can see the home page as above.

Register Data Protection API Service:

Now open a startup.cs file and in "ConfigureServie()" method we need to register Data Protection API service as below

  services.AddDataProtection()
  .PersistKeysToFileSystem(GetKyRingDirectoryInfo())
  .SetApplicationName("SharedCookieApp");


AddDataProtection().PersistKeysToFileSystem(GetKyRingDirectoryInfo()) here we created self Data Protection key and stored in specific folder.
. "SharedCookieApp" application name where it to be common.

Dynamically Create Data Protection API Key:

Now we need to provide DirectoryInfo to save the Data Protection API key. To do that add the following piece of code as follows

   private DirectoryInfo GetKyRingDirectoryInfo()
        {
            string applicationBasePath = System.AppContext.BaseDirectory;
            DirectoryInfo directoryInof = new DirectoryInfo(applicationBasePath);
            string keyRingPath = Configuration.GetSection("AppKeys").GetValue("keyRingPath");
            do
            {
                directoryInof = directoryInof.Parent;

                DirectoryInfo keyRingDirectoryInfo = new DirectoryInfo($"{directoryInof.FullName}{keyRingPath}");
                if (keyRingDirectoryInfo.Exists)
                {
                    return keyRingDirectoryInfo;
                }

            }
            while (directoryInof.Parent != null);
            throw new Exception($"key ring path not found");
        }


here I'm checking the folder path until able to found the path. You can directly assign the physical path, instead of checking for folder path by leveling up a parent folder on every iteration until its found.

Configure Cookie Settings:

Now we need to register cookie configuration to share login cookie between domain and subdomains
as below
  services.ConfigureApplicationCookie(options =>
            {
                options.Cookie.Name = ".AspNet.SharedCookie";
                options.Cookie.Domain = ".testmyapp.com";
            });

. Cookie.Name login cookie name
. Cookie.Domain to register main domain, so that cookie gets shared to subdomains

Data Protection API Key Path:

Now add a new folder in wwwroot folder and name it as "Ring". Where Data Protection Key gets created and saved. This key will be used to validate cookies as well as used in the encryption of sensitive data in the cookie.

Add the keyring folder path in the appSetting.json file as below


Test Login Cookie Sharing:

Now navigate to "http://testmyapp.com" and get logged in as below
Now navigate to "http://mobile.testmy.com" subdomain and we can observe we are automatically logged in as below


By observing both images, we successfully logged a user in both domain and subdomain using SSO cookie sharing.
Go to a "Ring" folder physical location used in our application. we can find the Data Protection key will get created which used to encrypting and validating our login cookie. Key sample as below



Summary:

SSO (Single Sign-On) was implemented successfully with subdomains of an application. Cookie encryption and decryption were done with the help of the Data Protection API provided by ASP.NET core. A similar cookie sharing concept can be used for an application runs under another application in IIS click here.

Refer:

. Source Code click here
Part 2: Share Authentication Cookie - Application Runs Under Another Application
. Step by step IIS hosting in Dotnet Core click here
. To fix issues on LocalDB while using IIS click here

Comments

  1. Replies
    1. I found it https://www.learmoreseekmore.com/2019/09/part-2-share-authentication-cookie.html

      Delete
  2. Nice article, but how can I achieve a SSO if you want to share the Authentication from .NET core cookie to ASP.NET 4.6.

    Thank you in advance.

    Platform
    ASP.NET Core 3.1 --> ASP.NET MVC 4.6

    ReplyDelete

Post a Comment

Popular posts from this blog

Blazor WebAssembly Custom Authentication From Scratch

In this article, we are going to explore and implement custom authentication from the scratch. In this sample, we will use JWT authentication for user authentication. Main Building Blocks Of Blazor WebAssembly Authentication: The core concepts of blazor webassembly authentication are: AuthenticationStateProvider Service AuthorizeView Component Task<AuthenticationState> Cascading Property CascadingAuthenticationState Component AuthorizeRouteView Component AuthenticationStateProvider Service - this provider holds the authentication information about the login user. The 'GetAuthenticationStateAsync()' method in the Authentication state provider returns user AuthenticationState. The 'NotifyAuthenticationStateChaged()' to notify the latest user information within the components which using this AuthenticationStateProvider. AuthorizeView Component - displays different content depending on the user authorization state. This component uses the AuthenticationStateProvider

How Response Caching Works In Asp.Net Core

What Is Response Caching?: Response Caching means storing of response output and using stored response until it's under it's the expiration time. Response Caching approach cuts down some requests to the server and also reduces some workload on the server. Response Caching Headers: Response Caching carried out by the few Http based headers information between client and server. Main Response Caching Headers are like below Cache-Control Pragma Vary Cache-Control Header: Cache-Control header is the main header type for the response caching. Cache-Control will be decorated with the following directives. public - this directive indicates any cache may store the response. private - this directive allows to store response with respect to a single user and can't be stored with shared cache stores. max-age - this directive represents a time to hold a response in the cache. no-cache - this directive represents no storing of response and always fetch the fr

.Net5 Web API Managing Files Using Azure Blob Storage

In this article, we are going to understand the different file operations like uploading, reading, downloading, and deleting in .Net5 Web API application using Azure Blob Storage. Azure Blob Storage: Azure blob storage is Microsoft cloud storage. Blob storage can store a massive amount of file data as unstructured data. The unstructured data means not belong to any specific type, which means text or binary data. So something like images or pdf or videos to store in the cloud, then the most recommended is to use the blob store. The key component to creating azure blob storage resource: Storage Account:- A Storage account gives a unique namespace in Azure for all the data we will save. Every object that we store in Azure Storage has an address. The address is nothing but the unique name of our Storage Account name. The combination of the account name and the Azure Storage blob endpoint forms the base address for each object in our Storage account. For example, if our Storage Account is n

.Net5 Web API Redis Cache Using StackExchange.Redis.Extensions.AspNetCore Library

In this article, we are going to explore the integration of Redis cache in .Net5 Web API application using the 'StackExchange.Redis.Exntensions' library. Note:- Microsoft has introduced an 'IDistributedCache' interface in dotnet core which supports different cache stores like In-Memory, Redis, NCache, etc. It is simple and easy to work with  'IDistributedCache', for the Redis store with limited features but if we want more features of the Redis store we can choose to use 'StackExchange.Redis.Extensions'.  Click here for Redis Cache Integration Using IDistributedCache Interface . Overview On StackExchange.Redis.Extnesions Library: The 'StackExchange.Redis.Extension' library extended from the main library 'StackExchange.Redis'. Some of the key features of this library like: Default serialization and deserialization. Easy to save and fetch complex objects. Search key. Multiple Database Access Setup Redis Docker Instance: For this sampl

Endpoint Routing In Asp.Net Core

How Routing Works In  Core 2.1 And Below Versions?: In Asp.Net Core routing is configured using app.UseRouter() or app.UseMvc() middleware. app.UseMvc(routes => { routes.MapRoute( name: "default", template: "{controller=Home}/{action=Index}/{id?}"); }); Here in Dotnet Core version 2.1 or below versions on the execution of route middleware request will be navigated appropriate controller matched to the route. An operation or functionality which is dependent on route URL or route values and that need to be implemented before the execution of route middleware can be done by accessing the route path from the current request context as below app.Use(async (context, next) => { if(context.Request.Path.Value.IndexOf("oldvehicle") != -1) { context.Response.Redirect("vehicle"); } else { await next(); } }); app.UseMvc(routes => { routes.MapRoute( name: "vehicleRoute", template: "vehicle", defaul

Asp.Net Core MVC Form Validation Techniques

Introduction: Form validations in any applications are like assures that a valid data is storing on servers. All programing frameworks have their own individual implementations for form validations. In Dotnet Core MVC application server-side validations carried on by the models with the help of Data Annotations and the client-side validations carried by the plugin jQuery Unobtrusive Validation. jQuery Unobtrusive Validation is a custom library developed by Microsoft based on the popular library  jQuery Validate . In this article, we are going to learn how the model validation and client-side validation works in Asp.Net Core MVC Application with sample examples. Getting Started: Let's create an Asp.Net Core MVC application project using preferred editors like Microsoft Visual Studio or Microsoft Visual Studio Code. Here I'm using Visual Studio. Let's create an MVC controller and name it as 'PersonController.cs' and add an action method as bel

NestJS File Upload

In this article, we are going to understand the steps to create a file uploading endpoint in the NestJS application. Key Features In NestJS File Upload: Let us know some key features of NestJS file upload before implementing a sample application. FileInterceptor: The 'FileInterceptor' will be decorated on top of the file upload endpoint. This interceptor will read single file data from the form posted to the endpoint. export declare function FilesInterceptor(fieldName: string, localOptions?: MulterOptions): Type<NestInterceptor>; Here we can observe the 'fieldName' first input parameter this value should be a match with our 'name' attribute value on the form file input field. So our interceptor read our files that are attached to the file input field. Another input parameter of 'MulterOptions' that provides configuration like file destination path, customizing file name, etc. FilesInterceptor: The 'FilesInterceptor' will be decorated on t

.NET Core MVC Application File Upload To Physical Location With Buffered Technique

Buffering Technique In File Upload: The server will use its Memory(RAM) or Disk Storage to save the files on receiving a file upload request from the client.  Usage of Memory(RAM) or Disk depends on the number of file requests and the size of the file.  Any single buffered file exceeding 64KB is moved from Memory to a temp file on disk.  If an application receives heavy traffic of uploading files there might be a chance of out of Disk or RAM memory which leads to crash application. So this Buffer technique used for small files uploading. In the following article, we create a sample for the file uploading using .NET Core MVC application. Create The .NET Core MVC Project: Let's create a .NET Core MVC project, here for this sample I'm using Visual Studio Code as below.   Check the link to use the Visual Studio Code for .NET Core Application . IFormFile: Microsoft.AspNetCore.Http.IFormFile used for file upload with buffered technique. On uploading files f

Ionic Picker Sample Code In Angular

Introduction: Ionic Picker(ion-picker) is a popup slides up from the bottom of the device screen, which contains rows with selectable column separated items. The main building block of ion-picker as follows: PickerController PickerOptions PickerController: PickerController object helps in creating an ion-picker overlay. create(opts?: Opts): Promise<Overlay> PickerController create method helps in create the picker overlay with the picker options PickerOptions: PickerOptions is a configuration object used by PickerController to display ion-picker. Single Column Ionic Picker: single.item.picker.ts: import { Component } from "@angular/core"; import { PickerController } from "@ionic/angular"; import { PickerOptions } from "@ionic/core"; @Component({ selector: "single-column-picker", templateUrl:"single.item.picker.html" }) export class SingleItemPicker { animals: string[] = ["Tiger&quo

.Net Core HttpClient JSON Extension Methods Using System.Net.Http.Json Package

.Net Core 3.0 onwards Microsoft brought up a new package called System.Net.Http.Json. This new package provides JSON extension methods for HttpClient. These JSON extension methods will have a prebuild mechanism for serializing or deserializing response data or payload of HttpClient call. System.Net.Http.Json extension methods that are provided to HttpClient, few of them are mentioned below. GetFromJsonAsync PostAsJsonAsync PutAsJsonAsync ReadFromJsonAsync In this article, we understand System.Net.Http.Json package by implementing the HttpClient samples by with and without JSON extension methods and compare them. Create A .Net Core Web API Sample Application: Let's create a .Net Core sample Web API application, from this application we will consume another Web API by implementing HttpClient calls. We can create a Web API sample application using IDE like Visual Studio 2019(Supports .Net Core 3.0 plus) or  Visual Studio Code . Create A Typed Client: In .Net Core using the Http