73 lines
2.5 KiB
Python
73 lines
2.5 KiB
Python
"""Inject the TLS peer cert into ASGI scope — uvicorn ≤ 0.44 does not.
|
|
|
|
Uvicorn's h11/httptools HTTP protocols build the ASGI ``scope`` dict
|
|
without any ``extensions.tls`` entry, so per-request cert pinning
|
|
handlers (like POST /swarm/heartbeat) can't see the client cert that
|
|
CERT_REQUIRED already validated at handshake.
|
|
|
|
We patch ``RequestResponseCycle.__init__`` on both protocol modules to
|
|
read the peer cert off the asyncio transport (which *does* carry it)
|
|
and write the DER bytes into
|
|
``scope["extensions"]["tls"]["client_cert_chain"]``. This is the same
|
|
key the ASGI TLS extension proposal uses, so the application code will
|
|
keep working unchanged if a future uvicorn populates it natively.
|
|
|
|
Import this module once at app startup time (before uvicorn starts
|
|
accepting connections). Idempotent — subsequent imports are no-ops.
|
|
"""
|
|
from __future__ import annotations
|
|
|
|
from typing import Any
|
|
|
|
|
|
_PATCHED = False
|
|
|
|
|
|
def _wrap_cycle_init(cycle_cls) -> None:
|
|
original = cycle_cls.__init__
|
|
|
|
def _patched_init(self, *args: Any, **kwargs: Any) -> None:
|
|
original(self, *args, **kwargs)
|
|
transport = kwargs.get("transport") or getattr(self, "transport", None)
|
|
if transport is None:
|
|
return
|
|
ssl_obj = transport.get_extra_info("ssl_object")
|
|
if ssl_obj is None:
|
|
return
|
|
try:
|
|
der = ssl_obj.getpeercert(binary_form=True)
|
|
except Exception:
|
|
return
|
|
if not der:
|
|
return
|
|
# scope is a mutable dict uvicorn stores here; Starlette forwards
|
|
# it to handlers as request.scope. Use setdefault so we don't clobber
|
|
# any future native extension entries from uvicorn itself.
|
|
scope = self.scope
|
|
extensions = scope.setdefault("extensions", {})
|
|
extensions.setdefault("tls", {"client_cert_chain": [der]})
|
|
|
|
cycle_cls.__init__ = _patched_init
|
|
|
|
|
|
def install() -> None:
|
|
"""Patch uvicorn's HTTP cycle classes. Safe to call multiple times."""
|
|
global _PATCHED
|
|
if _PATCHED:
|
|
return
|
|
try:
|
|
from uvicorn.protocols.http import h11_impl
|
|
_wrap_cycle_init(h11_impl.RequestResponseCycle)
|
|
except Exception: # nosec B110 - optional uvicorn impl may be unavailable
|
|
pass
|
|
try:
|
|
from uvicorn.protocols.http import httptools_impl
|
|
_wrap_cycle_init(httptools_impl.RequestResponseCycle)
|
|
except Exception: # nosec B110 - optional uvicorn impl may be unavailable
|
|
pass
|
|
_PATCHED = True
|
|
|
|
|
|
# Auto-install on import so simply importing this module patches uvicorn.
|
|
install()
|