Author Archives: Dominick Baier

What’s going on?

I just realized that my last blog post was over half a year ago when we announced our new company Duende Software. So what happened in the last 6 months of my life? In short – a ton! We left … Continue reading

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The Future of IdentityServer

Tl:dr Brock Allen and I have been working on the IdentityServer code-base for more than 10 years. In 2020 we will be making some important changes to it. Here’s why we are doing this. Our HistoryThe very first version … Continue reading

Posted in IdentityServer | 97 Comments

Flexible Access Token Validation in ASP.NET Core

The ASP.NET Core authentication system went through a couple of iterations, and is pretty good now. For API scenarios, the typical choice is the JwtBearer authentication handler, which can validate bearer JWT access tokens. There are other access token types … Continue reading

Posted in ASP.NET Core, OAuth | 6 Comments

Refresh Tokens in IdentityServer4 v4

I already wrote about the hardening of refresh tokens in this post. I would recommend reading this first. The upcoming OAuth 2.1 spec is pretty clear about refresh token handling: If the client is confidential, the refresh token must be … Continue reading

Posted in IdentityServer, OAuth | 3 Comments

Announcing IdentityServer4 v4.0

OK – it’s finally done. I published v4 to Nuget earlier today. You can find the complete set of changes/bug fixes/breaking changes here. We had to cut some features which were originally on our roadmap – we’ll revisit them for … Continue reading

Posted in IdentityServer | 2 Comments

Resource Access in IdentityServer4 v4 and going forward

In my last post I alluded to the tension between real-world token-based security architectures, the OAuth 2.0 scope model, JWT access tokens and the audience claim. We went through a couple of iterations in IdentityServer how we deal with those … Continue reading

Posted in IdentityServer, OAuth | 4 Comments

I don’t like Identity Tokens

…or rather the name ;) I bet that if you wake up most “identity professionals” in the middle of the night and ask them what an identity token is, the answer would be “a token about the identity of the … Continue reading

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The JWT Profile for OAuth 2.0 Access Tokens (and IdentityServer)

As part of creating our new Advanced OAuth training, I created a whole lecture on the evolution of access tokens and resource access. It’s fascinating – since the original OAuth 2.0 spec does not have any information about the token … Continue reading

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Updates on our Workshops

I am pleased to announce that we are now offering two workshops. I was mentioning that on Twitter already, and got a lot of questions. So I thought it would make sense to summarise them all in one place. You … Continue reading

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Automatic Token Management for ASP.NET Core and Worker Services 1.0

After a pretty long preview period, I am happy to announce that IdentityModel.AspNetCore 1.0 is now on Nuget. This library solves a problem that we have with every single OIDC/OAuth client we are creating: token management. Requesting and using a … Continue reading

Posted in .NET Security, ASP.NET Core, IdentityServer, OAuth, OpenID Connect | 1 Comment