How to login user from azure ad in asp net core web api

Introduction

ASP.NET is a popular programming language used for building web applications. In this article, we will discuss how to login a user from Azure AD in an ASP.NET Core Web API. We will provide step-by-step instructions with code examples to help you understand the process.

Prerequisites

Before we begin, make sure you have the following prerequisites:

  • An Azure AD tenant
  • An ASP.NET Core Web API project

Step 1: Register the Web API in Azure AD

The first step is to register your ASP.NET Core Web API in Azure AD. This will allow Azure AD to authenticate and authorize users for your .

To register your Web API, follow steps:

  1. Go to the Azure portal and navigate to Azure Directory.
  2. Select “App registrations” and click on “New registration”.
  3. Provide a name for your application and select the appropriate account type.
  4. Enter the redirect URI for your application.
  5. Click on “Register” to create the application.

After registering the Web API, you will receive a client ID and client secret. Make note of these values as we will use them in the code.

Step 2: Configure Authentication in ASP.NET Core

Next, we need to configure authentication in our ASP.NET Core Web API project. This involves adding the necessary NuGet packages and modifying the startup configuration.

To configure authentication, follow these steps:

  1. Add the Microsoft.Identity.Web NuGet package to your project.
  2. In the startup class, add the following code to the :

services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddMicrosoftIdentityWebApi(Configuration.GetSection("AzureAd"));

Make sure to replace “AzureAd” with the appropriate configuration section in your appsettings.json file.

  1. In the Configure method, add the following code:

app.UseAuthentication();
app.UseAuthorization();

Step 3: Login Endpoint

Now, let's implement the login endpoint in our ASP.NET Core Web API. This endpoint will handle the authentication process with Azure AD.

To implement the login endpoint, follow these steps:

  1. Create a new controller or modify an existing one.
  2. Add the following code to the controller:

[AllowAnonymous]
[("login")]
public  Task Login()
{
    // Code to handle login process
}

Inside the Login method, you can use the Microsoft.Identity.Web package to authenticate the user with Azure AD. You can find documentation and code examples on the Microsoft documentation website.

Step 4: Test the Login Endpoint

Finally, let's test the login endpoint to ensure everything is working correctly. You can use tools like Postman or curl to send a POST request to the login endpoint.

Make sure to include the necessary authentication headers and provide the required user credentials. If the authentication is successful, you should receive a valid access token.

Conclusion

In this article, we discussed how to login a user from Azure AD in an ASP.NET Core Web API. We provided step-by-step instructions and code examples to help you understand the process. By following these steps, you can easily integrate Azure AD authentication into your ASP.NET Core Web API.

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