Duende Skills

ASP.NET Core authentication middleware configuration including OpenID Connect, JWT Bearer, cookie authentication, authentication schemes, challenge/forbid flows, and external identity provider integration.

ASP.NET Core authorization patterns including policy-based authorization, IAuthorizationHandler implementations, scope-based authorization for APIs, authorization middleware configuration, and minimal API authorization.

Claims transformation and profile service patterns for Duende IdentityServer — IProfileService, IClaimsTransformation, claim type mapping, token claim filtering, extension grant validators, and dynamic claims loading.

Duende BFF (Backend for Frontend) security framework for securing SPAs. Covers session management, API endpoint proxying, token management, anti-forgery protection, and integration with React/Angular/Blazor frontends.

Security hardening for Duende IdentityServer deployments including signing key rotation, HTTPS enforcement, CORS configuration, CSP headers, rate limiting, token lifetime tuning, and security audit patterns.

Testing patterns for IdentityServer-based systems including integration testing with WebApplicationFactory, mock token issuance, test authority configuration, protocol response validation, and end-to-end authentication flow testing.

Protecting APIs with Duende IdentityServer: JWT bearer authentication, reference token introspection, scope-based authorization, DPoP/mTLS proof-of-possession validation, local API authentication, and multi-audience scenarios.

Orchestrate Duende IdentityServer in .NET Aspire AppHost — dependency graphs, authority URL wiring, health checks, and multi-instance.

Configure Duende IdentityServer including client definitions, API resources, identity resources, scopes, signing credentials, and server-side sessions. Covers client types (M2M, interactive, SPA), grant types, API Scopes vs API Resources vs Identity Resources, secret management, and client authentication methods. Includes both in-memory and database-backed configuration.

Configuring Dynamic Client Registration (DCR) in Duende IdentityServer: endpoint setup, authorization policies, custom validation with DynamicClientRegistrationValidator, software statement validation, IClientConfigurationStore, and separate DCR hosting.

Guide for deploying Duende IdentityServer to production, covering reverse proxy configuration, data protection, health checks, distributed caching, multi-instance deployment, OpenTelemetry integration, logging, and common deployment pitfalls.

Setting up and hosting Duende IdentityServer in ASP.NET Core applications, including DI registration, middleware pipeline, hosting patterns, essential options, license configuration, and ASP.NET Identity integration.

Managing cryptographic signing keys in Duende IdentityServer, including automatic key management, KeyManagementOptions, data protection at rest, static key configuration, migration from static to automatic, and multi-instance deployment considerations.

Configuring Duende IdentityServer as a SAML 2.0 Identity Provider (IdP): service provider registration, SSO and SLO flows, claim mappings, extensibility interfaces, and production deployment patterns.

Guide for configuring server-side sessions, session management and querying, inactivity timeout, dynamic identity providers, and CIBA (Client Initiated Backchannel Authentication) in Duende IdentityServer.