Category Security

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 […]

gRPC Bi-directional streaming with Razor Pages and a Hosted Service gRPC client

This article shows how a Bi-directional streaming gRPC service could be implemented using an .NET Core Hosted Service as a gRPC client, and a Razor Page to send Bi-directional streaming messages to the servers connected clients. 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 […]

ASP.NET Core OAuth Device Flow Client with IdentityServer4

This article shows how to implement the OAuth 2.0 Device Flow for Browserless and Input Constrained Devices in an ASP.NET Core application. The tokens are then saved to a cookie for later usage. IdentityServer4 is used to implement the secure token server. Code: https://github.com/damienbod/AspNetCoreHybridFlowWithApi History 2019-02-24 Updated packages, API calls Note: The code in the […]

Using Azure Key Vault from a non-Azure App

In this article, I show how Azure Key Vault can be used with a non Azure application. An example of this, is a console application used for data migrations, or data seeding during release pipelines. This app could then read the secret connection strings from the Key Vault, and then do the app logic as […]

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 […]