Tag Archives: OAuth
Securing APIs using ASP.NET Core and OAuth 2.0 DPoP
This article shows how an ASP.NET Core application can access an ASP.NET Core API using OAuth Demonstrating Proof-of-Possession (DPoP). This is a really powerful security enhancement which is relatively easy to support. The access tokens should only be used for what the access tokens are intended for. OAuth DPoP helps force this. This solution was […]
Application security context models
This article looks at a new concept for creating application security context models for modern solutions using best practice security. By using security context models in projects, a qualitative and secure authentication solution can be produced quicker and more efficient. At present, too many solution architects try to patch the security architecture after the application […]
Provision Azure IoT Hub devices using DPS and X.509 certificates in ASP.NET Core
This article shows how to provision Azure IoT hub devices using Azure IoT hub device provisioning services (DPS) and ASP.NET Core. The devices are setup using chained certificates created using .NET Core and managed in the web application. The data is persisted in a database using EF Core and the certificates are generated using the […]
Basic Authentication in ASP.NET Core
This article shows how basic authentication could be implemented in an ASP.NET Core application. This is not the recommended way to implement security for user flows as the password is always sent with each request but the flow is sometimes required to implement a standard or you sometimes need to support one side of an […]
Use multiple Azure AD access tokens in an ASP.NET Core API
This article shows how to setup an ASP.NET Core application to authorize multiple access tokens from different Azure AD App registrations. Each endpoint can only accept a single AAD access token and it is important that the other access tokens do not work on the incorrect API. ASP.NET Core Schemes and Policies are used to […]
Is scanning QR Codes for authentication safe?
This article explains why cross device authentication has security issues as it is subject to phishing attacks unless further authentication is used in the client. Scanning QR Codes for authentication does not protect against phishing and leaves the users open to having their session stolen. Phishing There a many forms of phishing and this is […]
Setup application client in Azure App Registration with App roles to use a web API
In Azure AD, a client application with no user (daemon client) which uses an access token to access an API protected with Microsoft Identity needs to use an Azure API Registration with App Roles. Scopes are used for delegated flows (with a User and a UI login). This is Azure AD specific not OAuth2. This […]
Implement a GRPC API with OpenIddict and the OAuth client credentials flow
This post shows how to implement a GRPC service implemented in an ASP.NET Core kestrel hosted service. The GRPC service is protected using an access token. The client application uses the OAuth2 client credentials flow with introspection and the reference token is used to get access to the GRPC service. The GRPC API uses introspection […]
Debug Logging Microsoft.Identity.Client and the MSAL OAuth client credentials flow
This post shows how to add debug logging to the Microsoft.Identity.Client MSAL client which is used to implement an OAuth2 client credentials flow using a client assertion. The client uses the MSAL nuget package. PII logging was activated and the HttpClient was replaced to log all HTTP requests and responses from the MSAL package. Code: […]
Implement Azure AD Continuous Access (CA) step up with ASP.NET Core Blazor using a Web API
This article shows how to implement Azure AD Continuous Access (CA) in a Blazor application which uses a Web API. The API requires an Azure AD conditional access authentication context. In the example code, MFA is required to use the external API. If a user requests data from the API using the required access token […]
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