Tag Archives: Security
Creating hashes in .NET
This article looks at different ways to create hashes in .NET Core. Hashes are useful for one way encryption which can be used for password storage, JWT validation and some other security use cases. When storing hashes in a database, extra care must be taken and the recommended approach from Microsoft should be used when […]
Sonar Webinar, end to end security of a web application
I did a Webinar on application security with Denis Troller and Sonar. I would like to thank Sonar for this opportunity, I really enjoyed it and found doing this together with you really professional, pleasant and fun to do. Here’s the recording: Link to the Sonar Q&A: https://community.sonarsource.com/t/webinar-end-to-end-security-in-a-web-application/115405 Link to the repository: https://github.com/damienbod/EndToEndSecurity
Implement a Microsoft Entra ID external authentication method using ASP.NET Core and OpenIddict
The article shows how to implement a Microsoft Entra ID external authentication method (EAM) using ASP.NET Core, OpenIddict and FIDO2/passkeys. The application using ASP.NET Core Identity to manage the accounts and the passkeys. Code: https://github.com/damienbod/MfaServer The following flow diagram from the Microsoft docs explains how EAM works. Refer to the documentation for a full explanation. […]
BFF secured ASP.NET Core application using downstream API and an OAuth client credentials JWT
This article shows how to implement a web application using backend for frontend security architecture for authentication and consumes data from a downstream API protected using a JWT access token which can only be accessed using an app-to-app access token. The access token is acquired using the OAuth2 client credentials flow and the API does […]
Create conditional access base policies for a Microsoft Entra ID tenant
This article shows some of the base conditional access policies which can be implemented for all Microsoft Entra ID tenants. Phishing resistant authentication should be required for all administration flows and some other user policies like sign-in risk MFA or terms of conditions. I recommend these base policies when implementing an Microsoft Entra ID tenant […]
Multi client blob storage access using ASP.NET Core with Entra ID authentication and RBAC
This article shows how to onboard different clients or organizations in an ASP.NET Core application to use separated Azure blob containers with controlled access using security groups and RBAC applied roles. Each user in a client group can only access a single blob storage and has no access to blob containers belonging to different clients. […]
Using a CSP nonce in Blazor Web
OLD, please refer to the blogs in the github repo. This article shows how to use a CSP nonce in a Blazor Web application using the InteractiveServer server render mode. Using a CSP nonce is a great way to protect web applications against XSS attacks and other such Javascript vulnerabilities. Code: https://github.com/damienbod/BlazorServerOidc Notes The code […]
Secure an ASP.NET Core Blazor Web app using Microsoft Entra ID
This article shows how to implement an ASP.NET Core Blazor Web application using Microsoft Entra ID for authentication. Microsoft.Identity.Web is used to implement the Microsoft Entra ID OpenID Connect client. Code: https://github.com/damienbod/Hostedblazor8MeID Note: I based this implementation on the example provided by Tomás López Rodríguez and adapted it. Setup The Blazor Web application is an […]
Securing a Blazor Server application using OpenID Connect and security headers
This article shows how to secure a Blazor Server application. The application implements an OpenID Connect confidential client with PKCE using .NET 8 and configures the security headers as best possible for the Blazor Server application. OpenIddict is used to implement the identity provider and the OpenID Connect server. Code: https://github.com/damienbod/BlazorServerOidc OpenID Connect flow In […]
Securing a MudBlazor UI web application using security headers and Microsoft Entra ID
This article shows how a Blazor application can be implemented in a secure way using MudBlazor UI components and Microsoft Entra ID as an identity provider. The MudBlazor UI components adds some inline styles and requires a specific CSP setup due to this and the Blazor WASM script requirements. Code: https://github.com/damienbod/MicrosoftEntraIDMudBlazor Setup The application is […]
Software Engineering 