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Category Archives: OAuth
Hardening OpenID Connect/OAuth Authorize Requests (and Responses)
One of the biggest strengths of OIDC and OAuth is the usage of the browser front-channel. The browser can show a UI and follow redirects, this makes it very powerful and flexible. Guess what – the biggest weakness of OIDC … Continue reading
Posted in IdentityServer, OAuth, OpenID Connect
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Hardening Refresh Tokens
Refresh tokens provide a UX friendly way to give a client long-lived access to resources without having to involve the user after the initial authentication & token request. This makes them also a high-value target for attackers, because they typically … Continue reading
Posted in IdentityServer, OAuth, Uncategorized
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OAuth 2.0: The long Road to Proof-of-Possession Access Tokens
I did a lot of WS-Security in my (distant) past – and whenever we started looking into migrating to OAuth 2.0, there was this one thing on the security check-list that was missing in the OAuth world: proof of possession … Continue reading
Posted in IdentityServer, OAuth
1 Comment
Use explicit typing for your JWTs
JWTs are being used in many places these days – identity tokens, access tokens, security events, logout tokens… You actually have to be careful when validating a JWT that you don’t mistakenly confuse it with a JWT that was issued … Continue reading
Posted in IdentityServer, OAuth
2 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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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
Sponsoring IdentityServer
Brock and I have been working on free identity & access control related libraries since 2009. This all started as a hobby project, and I can very well remember the day when I said to Brock that we can only … Continue reading
Posted in .NET Security, ASP.NET Core, IdentityServer, OAuth, OpenID Connect, Uncategorized, WebAPI
1 Comment
Updated Templates for IdentityServer4
We finally found the time to put more work into our templates. dotnet new is4empty Creates a minimal IdentityServer4 project without a UI. dotnet new is4ui Adds the quickstart UI to the current project (can be e.g added on top … Continue reading
Posted in ASP.NET Core, IdentityServer, OAuth, OpenID Connect, WebAPI
8 Comments
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