Asp net core saml authentication


ASP.NET is a popular programming language used for building web applications. One of the requirements in web applications is user authentication. In this article, we will explore how to SAML authentication in ASP.NET Core.

What is SAML Authentication?

SAML (Security Assertion Markup Language) is an XML-based open standard for exchanging authentication and authorization data between parties, in particular, between an identity provider (IdP) and a service provider (SP). It allows users to log in to multiple applications using a single set of credentials.

Setting up ASP.NET Core Application

Before we dive into implementing SAML authentication, let's set up a basic ASP.NET Core application. Open Studio and create a new ASP.NET Core Web Application . Choose the Web Application (-View-Controller) template and click on Next. Provide a name for your project and click on Create.

// ASP.NET Core code goes here

Adding SAML Authentication Middleware

To enable SAML authentication in our ASP.NET Core application, we need to add the necessary middleware. Open the Startup.cs file and add the following code inside the ConfigureServices method:

// Add SAML authentication middleware
services.AddSamlAuthentication(options =>
    options.IdentityProviderUrl = "";
    options.ServiceProviderUrl = "";
    options.SigningCertificate = LoadCertificate();

In the above code, we are the SAML authentication middleware by providing the identity provider URL, service provider URL, and the signing certificate. The LoadCertificate method can be implemented to load the certificate from a file or any source.

Configuring SAML Authentication

Next, we need to configure the SAML authentication middleware. Add the following code inside the Configure method in the Startup.cs file:

// Configure SAML authentication middleware

The above code adds the SAML authentication middleware to the request pipeline. It intercepts incoming requests and handles the SAML authentication process.

Handling SAML Authentication Callback

When the user tries to access a protected , the SAML authentication middleware redirects the user to the identity provider for authentication. After successful authentication, the identity provider sends a SAML response back to the service provider. We need to handle this callback and process the SAML response.

Add the following code inside the Configure method in the Startup.cs file:

// Handle SAML authentication callback
app.Use(async (context, next) =>
    if (context.Request.Path == "/saml/callback")
        var result = await context.AuthenticateAsync();
        if (result.Succeeded)
            // User is authenticated, redirect to the desired page

    await next();

In the above code, we are if the current request path is “/saml/callback”. If it is, we authenticate the user using the AuthenticateAsync method. If the authentication is successful, we redirect the user to the desired page.


In this article, we have explored how to implement SAML authentication in ASP.NET Core. We learned how to set up an ASP.NET Core application, add the necessary middleware, configure SAML authentication, and handle the authentication callback. By following steps, you can enable SAML authentication in your ASP.NET Core web application and provide a seamless login experience for your users.

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