Category Security

Create Certificates for IdentityServer4 signing using .NET Core

This article shows how to create certificates for an IdentityServer4 application to use for signing and token validation. The certificates are created using the CertificateManager nuget package. Both RSA and ECDsa certificates can be used for signing in IdentityServer4. Code: Certificates for IdentityServer4 signing using .NET Core Creating the Certificates in .NET Core A simple […]

Creating Certificates for X.509 security in Azure IoT Hub using .NET Core

This article shows how to create certificates in .NET Core which can be used for Azure IoT Hub. The chained certificates are created using the nuget package CertificateManager. Code: https://github.com/damienbod/AspNetCoreCertificates To use X.509 security with Azure IoT Hub, we would like to create chained certificates. This would make it possible to separate devices or group […]

Send MFA signin requirement to OpenID Connect server using ASP.NET Core Identity and IdentityServer4

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: https://github.com/damienbod/AspNetCoreHybridFlowWithApi Blogs in this series Force ASP.NET Core OpenID […]

Force ASP.NET Core OpenID Connect client to require MFA

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: https://github.com/damienbod/AspNetCoreHybridFlowWithApi 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 […]

WPF Azure AD signin with Sharepoint Online API call using Graph API

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: https://github.com/damienbod/WpfAzureADSharepointOnlineGraphApi Setup the Azure Active Directory […]

Securing a Web API using multiple token servers

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: https://github.com/damienbod/ApiJwtWithTwoSts Using multiple Authorities with shared certitficate The first way this can […]

Adding FIDO2 Passwordless authentication to an ASP.NET Core Identity App

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 […]