LeoVasanko
3ff41ca354
- validate_config: reject multiple auth-host marks per domain; sanitize_config clears extras (first wins) and coerces junk entry values to presence-only - origin_key: lowercase keys, strip trailing dots (bare hosts/wildcards) - Passkey._allowlisted: tolerate trailing-dot wildcard bases - wschat: stamp remote-flow sessions with the session host's domain, not the approver's - auth_host redirects: keep the port (redirect to the configured auth host instead of the normalized, port-less current host) - update_domain: required fields (wholesale replace) — no silent wipes - admin: fix pre-existing lockout-guard order in org permission removal; permission PATCH keeps domain restriction when omitted; 400 instead of 500 on unknown permission UUIDs - Drop dead code: db.update_config/set_session_host/delete_reset_token, Session.metadata, oidjwt.clear_key, background aliases, avatar.current_avatar_url/media_root, wsutil.require_pow - Prune stale/duplicated comments and docstrings
91 lines
3.5 KiB
Python
91 lines
3.5 KiB
Python
"""ASGI dispatch middleware: resolve the request Host to a domain.
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Every HTTP request and WebSocket connection is dispatched to exactly one
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domain, resolved from the Host header via the domain registry. The resolved
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domain is exposed as ``request.state.domain`` and through the
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:func:`paskia.domains.current_domain` contextvar, which endpoint code uses
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for all domain-dependent behavior (passkey configuration, site URLs).
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Unknown hosts are rejected before routing:
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- HTTP: ``421 Misdirected Request``
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- WebSocket: closed pre-accept with code 1008
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For WebSocket connections the Origin header selects the domain when it
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belongs to a different domain than the Host — a related-origin page using
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the domain's auth host. A cross-domain connection is only allowed when
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the Host is the origin domain's own auth host; otherwise the connection
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is closed pre-accept. When the Origin is missing or unknown the Host
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domain applies and endpoint-side origin validation decides.
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"""
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from fastapi.responses import PlainTextResponse
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from paskia import domains
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from paskia.util import hostutil
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_WS_CLOSE_POLICY_VIOLATION = 1008
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def _header(scope: dict, name: str) -> str | None:
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"""Return the first value of a lowercased ASGI header name."""
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key = name.encode()
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for header, value in scope.get("headers", []):
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if header == key:
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return value.decode()
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return None
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class DispatchMiddleware:
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"""Pure ASGI middleware dispatching each connection to its domain."""
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def __init__(self, app):
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self.app = app
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async def __call__(self, scope, receive, send):
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if scope["type"] == "http":
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await self._http(scope, receive, send)
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elif scope["type"] == "websocket":
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await self._websocket(scope, receive, send)
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else:
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await self.app(scope, receive, send)
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async def _http(self, scope, receive, send):
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domain = domains.registry().resolve(_header(scope, "host"))
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if domain is None:
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response = PlainTextResponse("Unknown host", status_code=421)
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await response(scope, receive, send)
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return
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await self._dispatch(scope, receive, send, domain)
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async def _websocket(self, scope, receive, send):
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registry = domains.registry()
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host = _header(scope, "host")
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host_domain = registry.resolve(host)
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if host_domain is None:
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await send({"type": "websocket.close", "code": _WS_CLOSE_POLICY_VIOLATION})
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return
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domain = host_domain
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origin = _header(scope, "origin")
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origin_host = hostutil.origin_hostname(origin) if origin else None
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origin_domain = registry.resolve(origin_host) if origin_host else None
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if origin_domain is not None and origin_domain is not host_domain:
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# Cross-domain connection: only via the origin domain's own auth host.
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own = origin_domain.own_auth_host
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if not own or hostutil.normalize_host(host) != hostutil.normalize_host(own):
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await send(
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{"type": "websocket.close", "code": _WS_CLOSE_POLICY_VIOLATION}
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)
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return
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domain = origin_domain
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await self._dispatch(scope, receive, send, domain)
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async def _dispatch(self, scope, receive, send, domain: domains.Domain):
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scope.setdefault("state", {})["domain"] = domain
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token = domains.set_current_domain(domain)
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try:
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await self.app(scope, receive, send)
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finally:
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domains.reset_current_domain(token)
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