SSOReady Example App: C# ASP.NET Core with SAML

This repo contains a minimal example app built with C# and ASP.NET Core that supports SAML using the SSOReady C# SDK.

SSOReady is an open-source way to add SAML and SCIM support to your application.

Running it yourself

To check out this repo yourself, you'll need a working installation of dotnet. Then, run:

git clone https://github.com/ssoready/ssoready-example-app-csharp-asnetcore-saml
cd ssoready-example-app-csharp-asnetcore-saml

dotnet run --project ./WebApplication/WebApplication.csproj

Then, visit http://localhost:5293.

How it works

There are two steps involved in implementing SAML:

1. Initiating SAML logins, where you redirect the user to their corporate identity provider
2. Handling SAML logins, where you log the user in after they've authenticated using SAML.

Initiating SAML logins

In this demo app, initiating SAML logins happens from the /saml-redirect endpoint:

app.MapGet("/saml-redirect", async (string email) =>
{
    var redirectResponse = await ssoready.Saml.GetSamlRedirectUrlAsync(new GetSamlRedirectUrlRequest
    {
        // convert john.doe@example.com to just example.com
        OrganizationExternalId = email.Split("@")[1]
    });

    return Results.Redirect(redirectResponse.RedirectUrl!);
});

You initiate a SAML login by calling Saml.GetSamlRedirectUrlAsync and redirecting to the returned URL.

The OrganizationExternalId is to tell SSOReady which customer's corporate identity provider you want to redirect to. In the demo app, we use example.com or example.org as the organization external ID.

Handling SAML logins

After your user finishes authenticating over SAML, SSOReady will redirect them back to your application. In this demo app, that callback URL is configured to be http://localhost:5293/ssoready-callback, so you'll get requests that look like this:

GET http://localhost:5293/ssoready-callback?saml_access_code=saml_access_code_...

Here's how the demo app handles those requests:

app.MapGet("/ssoready-callback", async (HttpContext context, [FromQuery(Name = "saml_access_code")] string samlAccessCode) =>
{
    var redeemResponse = await ssoready.Saml.RedeemSamlAccessCodeAsync(new RedeemSamlAccessCodeRequest
    {
        SamlAccessCode = samlAccessCode
    });

    context.Session.SetString("email", redeemResponse.Email!);
    return Results.Redirect("/");
});

You handle a SAML login by calling Saml.RedeemSamlAccessCodeAsync with the saml_access_code query parameter value, and logging the user in from the Email SSOReady returns to you.

And that's it! That's all the code you have to write to add SAML support to your application.

Configuring SSOReady

To make this demo app work out of the box, we did some work for you. You'll need to follow these steps yourself when you integrate SAML into your app.

The steps we took were:

1. We signed up for SSOReady at https://app.ssoready.com.

2. We created an environment, and configured its redirect URL to be http://localhost:5293/ssoready-callback.

3. We created an API key. Because this is a demo app, we hard-coded the API key. In production apps, you'll instead put that API key secret into an SSOREADY_API_KEY environment variable on your backend.

4. We created two organizations, both of which use DummyIDP.com as their "corporate" identity provider:

   • One organization has external ID example.com and a domain whitelist of just example.com.
   • The second organization has extnernal ID example.org and domain whitelist example.org.

In production, you'll create a separate organization for each company that wants SAML. Your customers won't be using DummyIDP.com; that's just a SAML testing service that SSOReady offers for free. Your customers will instead be using vendors including Okta, Microsoft Entra, and Google Workspace. From your code's perspective, those vendors will all look exactly the same.

Next steps

This demo app gives you a crash-course demo of how to implement SAML end-to-end. If you want to see how this all fits together in greater detail, with every step described in greater detail, check out the SAML quickstart or the rest of the SSOReady docs.