Category Archives: ASP.NET Core

Mutual TLS and Proof-of-Possession Tokens: Summary

This is the last part of my PoP and Mutual TLS post series. Part 1 covered some history and motivation, and part 2 looked at various server setups. Part 3 was supposed to be a walk-through guide on how to … Continue reading

Posted in ASP.NET Core, IdentityServer, OAuth, OpenID Connect | 2 Comments

Mutual TLS and Proof-of-Possession Access Tokens – Part 1: Setup

2020 is the year where I want proof-of-possession tokens to become reality. Mutual TLS seems to be the only feasible way to do that today. So here’s another post about it…. This is a two-part post. In this post we … Continue reading

Posted in ASP.NET Core, IdentityServer, OAuth, OpenID Connect | 5 Comments

Two is the magic Number

..and not 3. To build authentication systems for modern applications, all you need to understand are two OpenID Connect / OAuth 2.0 flow. That’s it. Client Credentials Flow This is probably the simplest flow and it is designed for server … Continue reading

Posted in ASP.NET Core, IdentityServer, OAuth, OpenID Connect | Leave a comment

IdentityServer for ASP.NET Core 3

In short: is released (along with the introspection and access control validation handler). As part of the longer version, you might ask yourself how we can do that before ASP.NET Core 3 itself is released. Well – it’s a slightly complicated … Continue reading

Posted in ASP.NET Core, IdentityServer, Uncategorized | 4 Comments

Another Take on Access Token Management in ASP.NET Core (…and announcing IdentityModel.AspNetCore)

I spent a lot of time on the client side recently – as part of our PolicyServer client libraries work, customer work, our updated guidance for our workshops as well as the various talks Brock and I gave on building … Continue reading

Posted in ASP.NET Core, IdentityModel, OAuth, OpenID Connect, Uncategorized | Leave a comment

Try Device Flow with IdentityServer4

The biggest new feature in IdentityServer4 v2.3 is support for the beta Device Flow specification. Device Flow is a flavour of OAuth 2.0 optimised for browserless and/or input-constrained devices. Things like TVs, gaming consoles, printers, cash registers, audio appliances etc. … Continue reading

Posted in ASP.NET Core, IdentityServer, OAuth | Leave a comment

An alternative way to secure SPAs (with ASP.NET Core, OpenID Connect, OAuth 2.0 and ProxyKit)

You might have noticed the recent public discussions around how to securely build SPAs – and especially about the “weak security properties” of the OAuth 2.0 Implicit Flow. Brock has written up a good summary here. The whole implicit vs … Continue reading

Posted in ASP.NET Core, OAuth, OpenID Connect, WebAPI | 15 Comments