AuthN Resolver SDK

SDK crate for the AuthN Resolver module, providing public API contracts for authentication in CyberFabric.

Overview

This crate defines the transport-agnostic interface for the AuthN Resolver module:

AuthNResolverClient — Async trait for consumers (authenticate bearer tokens)
AuthNResolverPluginClient — Async trait for plugin implementations
AuthenticationResult — Result containing the validated SecurityContext
AuthNResolverError — Error types for authentication failures
AuthNResolverPluginSpecV1 — GTS schema for plugin registration

Usage

Getting the Client

Consumers obtain the client from ClientHub:

use authn_resolver_sdk::AuthNResolverClient;

let authn = hub.get::<dyn AuthNResolverClient>()?;

Authenticating a Token

let result = authn.authenticate("eyJhbGciOiJSUzI1NiIs...").await?;
let ctx = result.security_context;

println!("Subject: {}", ctx.subject_id());
println!("Tenant: {}", ctx.subject_tenant_id());
println!("Scopes: {:?}", ctx.token_scopes());

AuthenticationResult

pub struct AuthenticationResult {
    /// Contains: subject_id, subject_tenant_id, token_scopes, bearer_token
    pub security_context: SecurityContext,
}

The SecurityContext carries the authenticated identity through the request pipeline. The original bearer token is preserved for downstream PDP forwarding.

Error Handling

use authn_resolver_sdk::AuthNResolverError;

match authn.authenticate(token).await {
    Ok(result) => { /* use result.security_context */ },
    Err(AuthNResolverError::Unauthorized(msg)) => { /* invalid/expired token */ },
    Err(AuthNResolverError::NoPluginAvailable) => { /* no AuthN plugin registered */ },
    Err(AuthNResolverError::ServiceUnavailable(msg)) => { /* plugin not ready */ },
    Err(AuthNResolverError::Internal(msg)) => { /* unexpected error */ },
}

Implementing a Plugin

Implement AuthNResolverPluginClient and register with a GTS instance ID:

use async_trait::async_trait;
use authn_resolver_sdk::{AuthNResolverPluginClient, AuthenticationResult, AuthNResolverError};

struct MyOidcPlugin { /* ... */ }

#[async_trait]
impl AuthNResolverPluginClient for MyOidcPlugin {
    async fn authenticate(&self, bearer_token: &str)
        -> Result<AuthenticationResult, AuthNResolverError> {
        // Validate token, extract claims, build SecurityContext
    }
}

License

Apache-2.0

cf-authn-resolver-sdk 0.2.4