Tag Archives: OAuth2

Handling Access Tokens for private APIs in ASP.NET Core

This article shows how to persist access tokens for a trusted ASP.NET Core application which needs to access secure APIs. These tokens which are persisted are not meant for public clients, but are used for the service to service communication. Code: https://github.com/damienbod/AspNetCoreHybridFlowWithApi Posts in this series: Securing an ASP.NET Core MVC application which uses a […]

Securing browser based Javascript, Typescript applications

This article should help you in choosing the right security for your browser based Javascript or Typescript applications. You should aim to secure the application as best as possible. The following diagram should help you in making your decision. Also for any of these flows, you should always use HTTPS. Appendix SPA: Single page application […]

Security Experiments with gRPC and ASP.NET Core 3.0

This article shows how a gRPC service could implement OAuth2 security using IdentityServer4 as the token service. Code: https://github.com/damienbod/Secure_gRpc Posts in this series Security Experiments with gRPC and ASP.NET Core 3.0 Running Razor Pages and a gRPC service in a single ASP.NET Core application gRPC Bi-directional streaming with Razor Pages and a Hosted Service gRPC […]

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 […]

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 […]

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 […]

ASP.NET Core Authorization for Windows, Local accounts

This article shows how authorization could be implemented for an ASP.NET Core MVC application. The authorization logic is extracted into a separate project, which is required by some certification software requirements. This could also be deployed as a separate service. Code: https://github.com/damienbod/AspNetCoreWindowsAuth Blogs in this series: Supporting both Local and Windows Authentication in ASP.NET Core […]