Tag Archives: OpenId connect

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 […]

User claims in ASP.NET Core using OpenID Connect Authentication

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: https://github.com/damienbod/AspNetCoreHybridFlowWithApi To use OpenID Connect in an ASP.NET Core application, the Microsoft.AspNetCore.Authentication.OpenIdConnect package can be used. This needs to be added […]

Securing a Vue.js app using OpenID Connect Code Flow with PKCE and IdentityServer4

This article shows how to setup a Vue.js SPA application to authenticate and authorize using OpenID Connect Code flow with PKCE. This is good solution when implementing SPA apps requesting data from APIs on separate domains. The oidc-client-js npm package is used to implement the client side authentication logic and validation logic. IdentityServer4 and ASP.NET […]

Is a SPA less secure than a server rendered web application?

In this post, I try to explain some of the differences between a single page application and a server rendered application and why the application types have different threat models. What is an Single Page Application (SPA)? A single page application runs in the browser, and handles routing in the client without posting back to […]

Securing Angular applications using the OpenID Connect Code Flow with PKCE

In this post, I show how an Angular application could be secured using the OpenID Connect Code Flow with Proof Key for Code Exchange (PKCE). The Angular application uses the OIDC lib angular-auth-oidc-client. In this example, the src code is used directly, but you could also use the npm package. Here’s an example which uses […]

OpenID Connect back-channel logout using Azure Redis Cache and IdentityServer4

This article shows how to implement an OpenID Connect back-channel logout, which uses Azure Redis cache so that the session logout will work with multi instance deployments. Code: https://github.com/damienbod/AspNetCoreBackChannelLogout Posts in this series: OpenID Connect back-channel logout using Azure Redis Cache and IdentityServer4 Using Azure Key Vault with ASP.NET Core and Azure App Services Deploying […]

Implementing a multi-tenant OIDC Azure AD external login for IdentityServer4

This article shows how to setup a multi-tenant Azure AD external login for IdentityServer4 which uses ASP.NET Core Identity. Code: IdentityServer4 app with Identity Setting up the Azure AD Application registration for multiple tenants An Azure AD Application registration needs to be setup for the Active Directory tenant. Login to the Azure portal and switch […]

OAuth using OIDC Authentication with PKCE for a .NET Core Console Native Application

This article shows how to use a .NET Core console application securely with an API using the RFC 7636 specification. The app logs into IdentityServer4 using the OIDC authorization code flow with a PKCE (Proof Key for Code Exchange). The app can then use the access token to consume data from a secure API. This […]