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Learn how to dynamically load `SAML2 IDP` configurations in ASP.NET Core applications, especially in load-balanced environments, using Sustainsys-Saml2.
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Dynamically Load SAML2 IDP using Sustainsys-Saml2 in ASP.NET Core: A Comprehensive Guide

When building ASP.NET Core applications that require Single Sign-On (SSO) capabilities, implementing SAML2 Identity Provider (IDP) setups can be a challenge, especially when it comes to loading these configurations dynamically. This is particularly important in load-balanced environments where multiple instances of an application are running concurrently. In this post, we'll walk through the key concepts and provide a practical solution for dynamically loading SAML2 IDP configurations using the Sustainsys.Saml2 library.

The Problem

In versioned applications, the need to dynamically add SAML2 IDPs can arise, particularly when user authentication settings require frequent updates or special configurations that can change during runtime.

Your current implementation allows you to dynamically add SAML2 IDP configurations, but you encounter difficulties when multiple application instances require access to these configurations server-side. Here’s a look at the code snippet you provided which demonstrates your current setup:

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While the core functionality seems to work, the challenge of handling this in a load-balanced environment needs addressing. Specifically, how can you ensure each instance of your app retrieves the most up-to-date SAML2 IDP configurations without relying on in-memory states?

The Solution

Utilize Notifications

A robust approach to dynamically manage SAML2 IDP configurations involves leveraging the GetIdentityProvider and SelectIdentityProvider notifications provided by the Sustainsys.Saml2 library. By implementing these notifications, you can query a central data source (like a database) each time a user attempts to log in, rather than relying on an in-memory collection that isn't shared across multiple server instances.

Step-by-Step Guide

Set Up Notification Handlers:

Begin by subscribing to the GetIdentityProvider and SelectIdentityProvider notifications in your startup configuration.

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Cache the IDP Objects Efficiently:

To optimize performance and prevent unnecessary metadata reloads, implement caching for the IdentityProvider objects. This will reduce the latency associated with querying the database for configuration data every request.

Implement Database Queries:

In your LoadConfigFromDatabase method, ensure that you write efficient SQL queries to pull the latest IDP information whenever it's needed.

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Testing:

After configuration, it’s important to extensively test this setup in a load-balanced environment to ensure that the dynamic loading works seamlessly and remains performant.

Conclusion

By utilizing notifications within the Sustainsys.Saml2 library, you can dynamically load SAML2 IDP configurations in a robust manner that supports multiple server instances efficiently. This solution not only ensures that your ASP.NET Core applications are set up for SSO seamlessly but also enhances scalability and maintainability.

We hope this guide helps you tackle the challenges of dynamic SAML2 IDP loading in your ASP.NET Core applications! If you have any questions or need further clarification, feel free to leave a comment below.