diff options
Diffstat (limited to 'synapse/http')
| -rw-r--r-- | synapse/http/matrixfederationclient.py | 9 | ||||
| -rw-r--r-- | synapse/http/server.py | 86 | ||||
| -rw-r--r-- | synapse/http/servlet.py | 40 | ||||
| -rw-r--r-- | synapse/http/site.py | 2 |
4 files changed, 67 insertions, 70 deletions
diff --git a/synapse/http/matrixfederationclient.py b/synapse/http/matrixfederationclient.py index c63d068f74..3c35b1d2c7 100644 --- a/synapse/http/matrixfederationclient.py +++ b/synapse/http/matrixfederationclient.py @@ -79,6 +79,7 @@ from synapse.types import JsonDict from synapse.util import json_decoder from synapse.util.async_helpers import AwakenableSleeper, timeout_deferred from synapse.util.metrics import Measure +from synapse.util.stringutils import parse_and_validate_server_name if TYPE_CHECKING: from synapse.server import HomeServer @@ -479,6 +480,14 @@ class MatrixFederationHttpClient: RequestSendFailed: If there were problems connecting to the remote, due to e.g. DNS failures, connection timeouts etc. """ + # Validate server name and log if it is an invalid destination, this is + # partially to help track down code paths where we haven't validated before here + try: + parse_and_validate_server_name(request.destination) + except ValueError: + logger.exception(f"Invalid destination: {request.destination}.") + raise FederationDeniedError(request.destination) + if timeout: _sec_timeout = timeout / 1000 else: diff --git a/synapse/http/server.py b/synapse/http/server.py index cf2d6f904b..6068a94b40 100644 --- a/synapse/http/server.py +++ b/synapse/http/server.py @@ -33,7 +33,6 @@ from typing import ( Optional, Pattern, Tuple, - TypeVar, Union, ) @@ -58,11 +57,13 @@ from synapse.api.errors import ( SynapseError, UnrecognizedRequestError, ) +from synapse.config.homeserver import HomeServerConfig from synapse.http.site import SynapseRequest from synapse.logging.context import defer_to_thread, preserve_fn, run_in_background from synapse.logging.opentracing import active_span, start_active_span, trace_servlet from synapse.util import json_encoder from synapse.util.caches import intern_dict +from synapse.util.cancellation import is_function_cancellable from synapse.util.iterutils import chunk_seq if TYPE_CHECKING: @@ -93,77 +94,16 @@ HTML_ERROR_TEMPLATE = """<!DOCTYPE html> HTTP_STATUS_REQUEST_CANCELLED = 499 -F = TypeVar("F", bound=Callable[..., Any]) - - -_cancellable_method_names = frozenset( - { - # `RestServlet`, `BaseFederationServlet` and `BaseFederationServerServlet` - # methods - "on_GET", - "on_PUT", - "on_POST", - "on_DELETE", - # `_AsyncResource`, `DirectServeHtmlResource` and `DirectServeJsonResource` - # methods - "_async_render_GET", - "_async_render_PUT", - "_async_render_POST", - "_async_render_DELETE", - "_async_render_OPTIONS", - # `ReplicationEndpoint` methods - "_handle_request", - } -) - - -def cancellable(method: F) -> F: - """Marks a servlet method as cancellable. - - Methods with this decorator will be cancelled if the client disconnects before we - finish processing the request. - - During cancellation, `Deferred.cancel()` will be invoked on the `Deferred` wrapping - the method. The `cancel()` call will propagate down to the `Deferred` that is - currently being waited on. That `Deferred` will raise a `CancelledError`, which will - propagate up, as per normal exception handling. - - Before applying this decorator to a new endpoint, you MUST recursively check - that all `await`s in the function are on `async` functions or `Deferred`s that - handle cancellation cleanly, otherwise a variety of bugs may occur, ranging from - premature logging context closure, to stuck requests, to database corruption. - - Usage: - class SomeServlet(RestServlet): - @cancellable - async def on_GET(self, request: SynapseRequest) -> ...: - ... - """ - if method.__name__ not in _cancellable_method_names and not any( - method.__name__.startswith(prefix) for prefix in _cancellable_method_names - ): - raise ValueError( - "@cancellable decorator can only be applied to servlet methods." - ) - - method.cancellable = True # type: ignore[attr-defined] - return method - - -def is_method_cancellable(method: Callable[..., Any]) -> bool: - """Checks whether a servlet method has the `@cancellable` flag.""" - return getattr(method, "cancellable", False) - - -def return_json_error(f: failure.Failure, request: SynapseRequest) -> None: +def return_json_error( + f: failure.Failure, request: SynapseRequest, config: Optional[HomeServerConfig] +) -> None: """Sends a JSON error response to clients.""" if f.check(SynapseError): # mypy doesn't understand that f.check asserts the type. exc: SynapseError = f.value # type: ignore error_code = exc.code - error_dict = exc.error_dict() - + error_dict = exc.error_dict(config) logger.info("%s SynapseError: %s - %s", request, error_code, exc.msg) elif f.check(CancelledError): error_code = HTTP_STATUS_REQUEST_CANCELLED @@ -387,7 +327,7 @@ class _AsyncResource(resource.Resource, metaclass=abc.ABCMeta): method_handler = getattr(self, "_async_render_%s" % (request_method,), None) if method_handler: - request.is_render_cancellable = is_method_cancellable(method_handler) + request.is_render_cancellable = is_function_cancellable(method_handler) raw_callback_return = method_handler(request) @@ -450,7 +390,7 @@ class DirectServeJsonResource(_AsyncResource): request: SynapseRequest, ) -> None: """Implements _AsyncResource._send_error_response""" - return_json_error(f, request) + return_json_error(f, request, None) @attr.s(slots=True, frozen=True, auto_attribs=True) @@ -549,7 +489,7 @@ class JsonResource(DirectServeJsonResource): async def _async_render(self, request: SynapseRequest) -> Tuple[int, Any]: callback, servlet_classname, group_dict = self._get_handler_for_request(request) - request.is_render_cancellable = is_method_cancellable(callback) + request.is_render_cancellable = is_function_cancellable(callback) # Make sure we have an appropriate name for this handler in prometheus # (rather than the default of JsonResource). @@ -575,6 +515,14 @@ class JsonResource(DirectServeJsonResource): return callback_return + def _send_error_response( + self, + f: failure.Failure, + request: SynapseRequest, + ) -> None: + """Implements _AsyncResource._send_error_response""" + return_json_error(f, request, self.hs.config) + class DirectServeHtmlResource(_AsyncResource): """A resource that will call `self._async_on_<METHOD>` on new requests, diff --git a/synapse/http/servlet.py b/synapse/http/servlet.py index 4ff840ca0e..80acbdcf3c 100644 --- a/synapse/http/servlet.py +++ b/synapse/http/servlet.py @@ -23,9 +23,13 @@ from typing import ( Optional, Sequence, Tuple, + Type, + TypeVar, overload, ) +from pydantic import BaseModel, MissingError, PydanticValueError, ValidationError +from pydantic.error_wrappers import ErrorWrapper from typing_extensions import Literal from twisted.web.server import Request @@ -694,6 +698,42 @@ def parse_json_object_from_request( return content +Model = TypeVar("Model", bound=BaseModel) + + +def parse_and_validate_json_object_from_request( + request: Request, model_type: Type[Model] +) -> Model: + """Parse a JSON object from the body of a twisted HTTP request, then deserialise and + validate using the given pydantic model. + + Raises: + SynapseError if the request body couldn't be decoded as JSON or + if it wasn't a JSON object. + """ + content = parse_json_object_from_request(request, allow_empty_body=False) + try: + instance = model_type.parse_obj(content) + except ValidationError as e: + # Choose a matrix error code. The catch-all is BAD_JSON, but we try to find a + # more specific error if possible (which occasionally helps us to be spec- + # compliant) This is a bit awkward because the spec's error codes aren't very + # clear-cut: BAD_JSON arguably overlaps with MISSING_PARAM and INVALID_PARAM. + errcode = Codes.BAD_JSON + + raw_errors = e.raw_errors + if len(raw_errors) == 1 and isinstance(raw_errors[0], ErrorWrapper): + raw_error = raw_errors[0].exc + if isinstance(raw_error, MissingError): + errcode = Codes.MISSING_PARAM + elif isinstance(raw_error, PydanticValueError): + errcode = Codes.INVALID_PARAM + + raise SynapseError(HTTPStatus.BAD_REQUEST, str(e), errcode=errcode) + + return instance + + def assert_params_in_dict(body: JsonDict, required: Iterable[str]) -> None: absent = [] for k in required: diff --git a/synapse/http/site.py b/synapse/http/site.py index eeec74b78a..1155f3f610 100644 --- a/synapse/http/site.py +++ b/synapse/http/site.py @@ -226,7 +226,7 @@ class SynapseRequest(Request): # If this is a request where the target user doesn't match the user who # authenticated (e.g. and admin is puppetting a user) then we return both. - if self._requester.user.to_string() != authenticated_entity: + if requester != authenticated_entity: return requester, authenticated_entity return requester, None |