How is authentication and authorization handled in a .NET full-stack app (e.g., JWT, IdentityServer)?

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In a .NET full-stack application, authentication and authorization are typically handled using standards like JWT (JSON Web Tokens) and frameworks like ASP.NET Core Identity or Identity Server. These tools ensure secure user access and resource protection.

1. Authentication:

Authentication verifies who the user is.

• ASP.NET Core Identity:
  Provides user management (registration, login, password hashing). Can be used with cookie-based or token-based auth.

• JWT (JSON Web Token):
  Common in SPA or API-based apps. After a successful login, the server issues a signed JWT, which the client stores (usually in localStorage) and includes in the Authorization header for future requests.

2. Authorization:

Authorization controls what the user can access.

• Role-based Authorization:
  Assigns roles (e.g., Admin, User) to users and checks access using [Authorize(Roles = "Admin")].

• Policy-based Authorization:
  Allows custom rules based on claims or logic.

3. Identity Server (or Duende Identity Server):

• A full-featured OpenID Connect and OAuth 2.0 provider for token issuance and centralized identity management.

• Used in microservices or enterprise setups to support SSO, API security, and federated identity.

• Works with JWT to issue access and refresh tokens securely.

Client-Side (e.g., Angular/React):

• Sends credentials to the API.

• Stores JWT on successful login.

• Attaches JWT to API requests for protected endpoints.

Conclusion:

Authentication and authorization in .NET apps are handled using tools like JWT, ASP.NET Core Identity, and Identity Server, ensuring secure and scalable identity management for modern web applications.

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