This post adds the custom ASP.NET Core Identity, IdentityServer4 logic to check for the “acr_values” and react if a client application requests MFA for authentication. The “acr_values” parameter is used to pass the mfa value from the client to the server in the authentication request. Code: Blogs in this series Force ASP.NET Core OpenID […]

This article shows how an ASP.NET Core Razor Page application which uses OpenID Connect to sign in, can require that users have authenticated using MFA (multi factor authentication). Code: Blogs in this series Force ASP.NET Core OpenID Connect client to require MFA Send MFA signin requirement to OpenID Connect server using ASP.NET Core Identity […]

This post shows how HTTP route parameters, a HTTP request body or HTTP request query string parameters can be used for authorization in ASP.NET Core. Code: Authorization using ASP.NET Core Route parameters An AuthorizationHandler can be used to implement authorization logic in ASP.NET Core. The handler can authorize HTTP requests using a route parameter […]

This article shows how a native WPF application could authenticate and authorize using an Azure Active Directory App Registration and then upload and download files in Sharepoint Online. The Graph API is used to access Sharepoint. Other Sharepoint libraries will NOT work if using an Azure AD signin. Code: Setup the Azure Active Directory […]

This article shows two possible ways of getting user claims in an ASP.NET Core application which uses an IdentityServer4 service. Both ways have advantages and require setting different code configurations in both applications. Code: To use OpenID Connect in an ASP.NET Core application, the Microsoft.AspNetCore.Authentication.OpenIdConnect package can be used. This needs to be added […]

This article shows how a single secure Web API could be used together with multiple secure token servers. The API uses JWT Bearer token authentication, but because the access token come from different token servers, the tokens validation need to be changed. Code: Using multiple Authorities with shared certitficate The first way this can […]

This article shows how FIDO2 WebAuthn could be used for a passwordless sign in integrated into an ASP.NET Core Identity application. The FIDO2 WebAuthn is implemented using the fido2-net-lib Nuget package, and demo code created by Anders Åberg. The application is implemented using ASP.NET Core 3.0 with Identity. For information about FIDO2 and WebAuthn, please […]

This article shows how to secure an ASP.NET Core Razor Page application using the Open ID Connect code flow with PKCE (Proof Key for Code Exchange). The secure token server is implemented using IdentityServer4 but any STS could be used which supports PKCE. Code: An ASP.NET Core 3.0 Razor Page application without identity was […]

This article shows how Vue.js can be used together with ASP.NET Core 3 in a single project. The Vue.js application is built using the Vue.js CLI and built to the wwwroot of the ASP.NET Core application. The ASP.NET Core application is used to implement the APIs consumed by the Vue.js UI. The application is secured […]

This article shows how an HttpClient instance could be setup to send a certificate to an API to use for certificate authentication. In an ASP.NET Core application, the IHttpClientFactory can be used to get an instance of the HttpClient. Code Posts in this series Certificate Authentication in ASP.NET Core 3.0 (Self Signed) Using Chained […]