This article shows how to secure and use different APIs in an ASP.NET Core API which support OAuth access tokens from multiple identity providers. Access tokens from Azure AD and from Auth0 can be be used to access data from the service. Each API only supports a specific token from the specific identity provider. Microsoft.Identity.Web is used to implement the access token authorization for the Azure AD tokens and the default authorization is used to support the Auth0 access tokens.

Code: https://github.com/damienbod/SeparatingApisPerSecurityLevel

Setup

An API ASP.NET Core application is created to implement the multiple APIs and accept access tokens created by Auth0 and Azure AD. The access tokens need to be validated and should only work for the intended purpose for which the access token was created. The Azure AD API is used by an ASP.NET Core Razor page application which requests an user access token with the correct scope to access the API. Two Azure AD App registrations are used to define the Azure AD setup. The Auth0 application is implemented using a Blazor server hosted application and accesses the two Auth0 APIs, See the pervious post for details.

#security #azure ad #oauth #dotnet #dotnet core #aspdotnet core