Tag Archives: OAuth

Implementing OAuth Pushed Authorisation Requests in Angular

This posts shows how an Angular application can be secured using Open ID Connect code flow with PKCE and OAuth Pushed Authorisation Requests using node-oidc-provider as the identity provider. This requires configuration on both the client and the identity provider. Code: par-angular Getting started using Schematics and angular-auth-oidc-client The Angular client is implemented using angular-auth-oidc-client. […]

Implement app roles authorization with Azure AD and ASP.NET Core

This post shows how to implement Azure AD App roles and applied to users or groups in Azure AD. The roles are used in an ASP.NET Core Razor page application as well as a ASP.NET Core API. The roles from the access token and the id token are used to authorize the identity which is […]

Protecting legacy APIs with an ASP.NET Core Yarp reverse proxy and Azure AD OAuth

This article shows how a legacy API could be protected using an ASP.NET Core Yarp reverse proxy and Azure AD OAuth. The security is implemented using Azure AD and Microsoft.Identity.Web. Sometimes it is not possible to update an existing or old API within a reasonable price and the financially best way to use it in […]

Using multiple APIs in Angular and ASP.NET Core with Azure AD authentication

This article shows how an Angular application could be used to access many APIs in a secure way. An API is created specifically for the Angular UI and the further APIs can only be access from the trusted backend which is under our control. Code: https://github.com/damienbod/AzureADAuthRazorUiServiceApiCertificate Posts in this series Implement Azure AD Client credentials […]

Securing an ASP.NET Core API which uses multiple access tokens

This post shows how an ASP.NET Core API can authorize API calls which use different access tokens from different identity providers or different access tokens from the same identity provider but created for different clients and containing different claims. The access tokens are validated using JWT Bearer authentication as well as an authorization policy which […]

Using Microsoft Graph API in ASP.NET Core

This post shows how Microsoft Graph API can be used in both ASP.NET Core UI web applications and also ASP.NET Core APIs for delegated identity flows. The ASP.NET Core applications are secured using Microsoft.Identity.Web. In the API project, the Graph API client is used in a delegated flow with user access tokens getting an access […]

Implement a Web APP and an ASP.NET Core Secure API using Azure AD which delegates to a second API

This article shows how an ASP.NET Core Web application can authenticate and access a downstream API using user access tokens and delegate to another API in Azure AD also using user access tokens. Microsoft.Identity.Web is used in all three applications to acquire the tokens for the Web API and the access tokens for the two […]

Using Key Vault certificates with Microsoft.Identity.Web and ASP.NET Core applications

This post shows how Azure Key Vault certificates can be used with Microsoft.Identity.Web in an ASP.NET Core application which requires a downstream “access_as_user” API. The Azure AD App Registrations requires a certificate instead of a client secret. Code: https://github.com/damienbod/AzureADAuthRazorUiServiceApiCertificate Posts in this series Implement Azure AD Client credentials flow using Client Certificates for service APIs […]

Implement Azure AD Client credentials flow using Client Certificates for service APIs

This post shows how to implement an Azure client credential flows to access an API for a service-to-service connection. No user is involved in this flow. A client certificate (Private Key JWT authentication) is used to get the access token and the token is used to access the API which is then used and validated […]

Restricting access to an Azure AD protected API using Azure AD Groups

This post shows how to restrict access to an ASP.NET Core API to only allow users from a defined Azure AD group to use a protected API. The API uses an Azure App registration for authorization. The user signs in with an ASP.NET Core Razor page application or an Angular App and can access the […]