Category Archives: OAuth

Identity vs Permissions

We often see people misusing IdentityServer as an authorization/permission management system. This is troublesome – here’s why. IdentityServer (hence the name) is really good at providing a stable identity for your users across all applications in your system. And with … Continue reading

Posted in .NET Security, IdentityServer, OAuth, OpenID Connect, WebAPI | 23 Comments

IdentityServer4 and ASP.NET Core 1.1

aka RC5 – last RC – promised! The update from ASP.NET Core 1.0 (aka LTS – long term support) to ASP.NET Core 1.1 (aka Current) didn’t go so well (at least IMHO). There were a couple of breaking changes both … Continue reading

Posted in ASP.NET, OAuth, OpenID Connect, WebAPI | 3 Comments

New in IdentityServer4: Resource-based Configuration

For RC4 we decided to re-design our configuration object model for resources (formerly known as scopes). I know, I know – we are not supposed to make fundamental breaking changes once reaching the RC status – but hey – we … Continue reading

Posted in .NET Security, ASP.NET, OAuth, Uncategorized, WebAPI | 21 Comments

New in IdentityServer4: Multiple allowed Grant Types

In OAuth 2 some grant type combinations are insecure, that’s why we decided for IdentityServer3 that we’ll be defensive and allow only a single grant type per client. During the last two years of implementing OAuth 2, it turned out … Continue reading

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

IdentityServer4 RC2 released

Yesterday we pushed IdentityServer4 RC2 to nuget. There are no big new features this time, but a lot of cleaning up, bug fixing and adding more tests. We might add one or two more bigger things before RTM – but … Continue reading

Posted in .NET Security, ASP.NET, IdentityModel, IdentityServer, OAuth, OpenID Connect, WebAPI | 2 Comments

IdentityModel v2 released

IdentityModel is our protocol client library for various OpenID Connect and OAuth 2 endpoints like discovery, userinfo, token, introspection and token revocation. In addition it has some general purpose helpers like generating random numbers, base64 URL encoding, time-constant string comparison … Continue reading

Posted in .NET Security, IdentityModel, OAuth, OpenID Connect, WebAPI | 1 Comment

New in IdentityServer4: Resource Owner Password Validation

Not completely new, but re-designed. In IdentityServer3, we used the user service for both interactive as well as non-interactive authentication. In IdentityServer4, the interactive authentication is done by the UI. OAuth 2 resource owner password validation is disabled by default … Continue reading

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