Tag Archives: Security
Use client assertions in ASP.NET Core using OpenID Connect, OAuth DPoP and OAuth PAR
This post looks at implement client assertions in an ASP.NET Core application OpenID Connect client using OAuth Demonstrating Proof of Possession (DPoP) and OAuth Pushed Authorization Requests (PAR). Code: https://github.com/swiss-ssi-group/swiyu-passkeys-idp-loi-loa Blogs in this series: Setup An ASP.NET code application is setup to authentication using OpenID Connect and OAuth PAR. The web application is an OIDC […]
Force step up authentication in web applications
The post shows how to implement a step up authorization using the OAuth 2.0 Step Up Authentication Challenge Protocol RFC 9470. The application uses ASP.NET Core to implement the API, the web application and the identity provider. Duende IdentityServer is used to implement the OpenID Connect server standard and also OAuth DPoP token binding as […]
Set the amr claim when using passkeys authentication in ASP.NET Core
The post shows how to set the correct amr value when authenticating using ASP.NET Core Identity and passkeys in .NET 10. When authenticating using OpenID Connect and passkeys authentication, the OpenID Connect Extended Authentication Profile (EAP) ACR Values 1.0 specification should be used for the implementation. The amr claim should return the pop value. Blogs […]
Digital Authentication and Identity validation
This post looks at authentication and identity validation and describes what should be validated and some of the concepts. With the increasing push to move processes to a digital world and the new threat models, authentication and identity validation MUST be implemented in a professional way. Using standards like OpenID Connect, OAuth and OpenID VCs […]
Reset Cookies and force new sign-in using ASP.NET Core Identity
This post looks at implementing a cookie reset in an ASP.NET Core application using Duende identity server which federates to Entra ID. Sometimes cookies need to be reset for end users due to size problems, or unknown remote authentication server errors. The cookies can be cleared and a new sign in can be forced. Code: […]
Use EdDSA signatures to validate tokens in ASP.NET Core using OpenID Connect
Some identity providers use the EdDSA / ED25519 algorithm to sign and issue tokens. This post shows how to validate the tokens using the Nuget package from ScottBrady and ASP.NET Core. Using the default OpenID Connect setup, the keys are not read and the tokens cannot be validated. The error message could return something like […]
Implement ASP.NET Core OpenID Connect with Keycloak to implement Level of Authentication (LoA) requirements
This post looks at implementing an OpenID Connect client in ASP.NET Core and require a level of authentication (LoA) implemented using Keycloak. The applications are hosted using Aspire. The LoA is requested in Keycloak using the acr_values claim. Code: https://github.com/damienbod/IdentityExternalErrorHandling Setup The applications are implemented using Aspire. An ASP.NET Core application uses an OpenID Connect […]
Experimental alternative flow for OAuth First-Party Applications
This post looks at an alternative way of implementing a native app authentication and authorization. At present, a web browser is used to implement authentication of native applications when using OAuth and OpenID Connect. The alternative approach implemented in the post is based on the OAuth 2.0 for First-Party Applications draft and adapted to be […]
Handling OpenID Connect error events in ASP.NET Core
ASP.NET Core provides great extension points for handling OpenID Connect error events. This blog looks at implementing error handling in an ASP.NET Core application implemented using ASP.NET Core Identity. Code: https://github.com/damienbod/IdentityExternalErrorHandling Setup The application uses OpenID Connect to implement the authentication of the user identities. This implements a standard OpenID Connect flow and uses Microsoft […]
Using multiple external identity providers from ASP.NET Core Identity and Duende IdentityServer
This blog post shows how an ASP.NET Core Identity application can integrate and implement multiple external identity providers. An OIDC client UI uses the solution and is implemented using Duende IdentityServer. The same scheme is used for all the external providers and mapped to the identity for the client UI and the application. Using OpenID […]
Software Engineering 