fastapi-gsap/gsap_broker/app.py
Tyler J King 782f5654ac fix: shared bearer auth, delegation depth, SQLite permissions
C-4: MCP endpoint requires verified bearer token. Unauthenticated
     requests rejected. _extract_principal() replaced by verified
     AuthResult from middleware.
C-8: All delegation endpoints require verified bearer token.
     X-Delegator-DID header removed — identity from token only.
     delegator_ac_id validated to belong to authenticated principal.
     Only delegators can revoke. Only delegator/delegate can view.
H-6: SQLite file permissions restricted to 0o600 (owner-only).
     Umask set before creation. WAL/SHM files also restricted.
H-7: Delegation depth tracked and enforced against max_delegation_depth.
     Sub-delegations increment depth. Exceeded depth → 403.

Shared TokenAuthenticator auto-detects identity driver from JWT
issuer claim (Keycloak or Entra). verify_bearer FastAPI dependency
for all protected endpoints. Health endpoint remains public.

ALL 10 critical findings CLOSED. ALL 10 high findings CLOSED.

Signed-off-by: Tyler King <tking@guildhouse.dev>
2026-04-14 17:31:46 -04:00

59 lines
2.7 KiB
Python

"""fastapi-gsap: Lightweight GSAP broker — GCAP-SPEC-SHELLBOUND-BROKER-0001.
Also hosts the delegation lifecycle module
(GCAP-SPEC-LLM-PRINCIPAL-BROKER-0001) absorbed from the standalone
llm-principal-broker service. The delegation router is mounted at
``/delegations`` and the storage layer reuses GSAP's existing async DB
engine — no separate process, no HTTP self-call.
"""
import asyncio
import structlog
from contextlib import asynccontextmanager
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from gsap_broker.settings import settings
from gsap_broker.db import init_db
from gsap_broker.routers import authorize, complete, session, elevate, health, drivers, connectors, functions
from gsap_broker import mcp
from gsap_broker.delegations.router import router as delegations_router, manager as delegation_manager
from gsap_broker.delegations.cleanup import cleanup_loop as delegation_cleanup_loop
# Import storage so SQLModel.metadata picks up the delegations table at init_db().
from gsap_broker.delegations import storage as _delegations_storage # noqa: F401
logger = structlog.get_logger()
@asynccontextmanager
async def lifespan(app: FastAPI):
await init_db()
# Fix C-4/C-8: initialize shared bearer auth middleware
from gsap_broker.auth.middleware import init_authenticator
init_authenticator()
cleanup_task = asyncio.create_task(delegation_cleanup_loop(delegation_manager))
logger.info(
"fastapi-gsap started",
broker_did=settings.broker_did,
delegations_router="/delegations",
)
try:
yield
finally:
cleanup_task.cancel()
try:
await cleanup_task
except asyncio.CancelledError:
pass
app = FastAPI(title="fastapi-gsap", description="GSAP broker PoC — GCAP-SPEC-SHELLBOUND-BROKER-0001",
version="0.1.0", lifespan=lifespan)
app.add_middleware(CORSMiddleware, allow_origins=settings.cors_origins, allow_credentials=True,
allow_methods=["*"], allow_headers=["*"])
app.include_router(authorize.router, prefix="/governance", tags=["AC"])
app.include_router(complete.router, prefix="/governance", tags=["CR"])
app.include_router(session.router, prefix="/governance", tags=["Session"])
app.include_router(elevate.router, prefix="/governance", tags=["Elevation"])
app.include_router(drivers.router, prefix="/governance", tags=["Drivers"])
app.include_router(connectors.router, prefix="/connectors", tags=["Connectors"])
app.include_router(functions.router, prefix="/functions", tags=["Functions"])
app.include_router(health.router, tags=["Health"])
app.include_router(mcp.router, tags=["MCP"])
app.include_router(delegations_router)