blazkaro / FAPIServer

The FAPI implementation in C#

FAPI Server

That's flexible, but not fully compatible implementation of FAPI, OAuth2.1 and OpenID Connect specifications. It supports:

• Grant Management for OAuth2.0
• OAuth 2.0 Rich Authorization Requests in modified version, will explain later
• OAuth 2.0 Pushed Authorization Requests
• OAuth 2.0 Demonstrating Proof-of-Possession at the Application Layer (DPoP)
• OpenID Connect Client-Initiated Backchannel Authentication Flow - Core 1.0
• Authorization endpoint
• Token endpoint
• Token revocation endpoint
• Token introspection endpoint
• User info endpoint
• Discovery endpoint

Documentation

https://blazkaro.github.io/FAPIServerDocumentation/

Why it's not fully compatible?

• It uses PASETO instead of JWT, and PASERK instead of JWK. Every token like access token, authorization response and DPoP uses PASETO.
• It doesn't support mTLS, only private_key_paseto (private_key_jwt that uses PASETO) as authentication method
• Currently, it doesn't support server-provided nonce defined in FAPI 2.0 Security Profile

Roadmap

• Support for CIBA
• Support for application-level request signing between client and authorization server by using client_assertion and DPoP mechanism, or by request objects. (milestone)
• Support for signing userinfo, token introspection and grant querying responses
• Support for DPoP revocation after use (the same mechanism as with client_assertion)
• Add better documentation for project
• Add unit tests

Security policy

If you see security issues, please contact me by email, [e-mail]