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Category Archives: ASP.NET Core
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
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
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
4 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
8 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
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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
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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
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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
Automatic OAuth 2.0 Token Management in ASP.NET Core
As part of the recent discussions around how to build clients for OpenID Connect and OAuth 2.0 based systems (see e.g. Brock’s post here), we substantially updated our workshop and supporting libraries. The updated material (both workshop and break-out sessions) will … Continue reading
Posted in ASP.NET Core, Uncategorized
12 Comments
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