mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
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557 lines
18 KiB
Python
557 lines
18 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer
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from synapse.api.urls import FEDERATION_PREFIX as PREFIX
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from synapse.api.errors import Codes, SynapseError, LimitExceededError
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from synapse.util.async import sleep
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from synapse.util.logutils import log_function
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import collections
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import logging
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import simplejson as json
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import re
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logger = logging.getLogger(__name__)
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class FederationRateLimiter(object):
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def __init__(self, clock, window_size, sleep_limit, sleep_msec,
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reject_limit, concurrent_requests):
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"""
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Args:
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clock (Clock)
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window_size (int): The window size in milliseconds.
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sleep_limit (int): The number of requests received in the last
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`window_size` milliseconds before we artificially start
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delaying processing of requests.
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sleep_msec (int): The number of milliseconds to delay processing
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of incoming requests by.
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reject_limit (int): The maximum number of requests that are can be
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queued for processing before we start rejecting requests with
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a 429 Too Many Requests response.
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concurrent_requests (int): The number of concurrent requests to
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process.
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"""
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self.clock = clock
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self.window_size = window_size
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self.sleep_limit = sleep_limit
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self.sleep_msec = sleep_msec
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self.reject_limit = reject_limit
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self.concurrent_requests = concurrent_requests
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self.ratelimiters = {}
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def ratelimit(self, host):
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"""Used to ratelimit an incoming request from given host
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Example usage:
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with rate_limiter.ratelimit(origin) as wait_deferred:
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yield wait_deferred
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# Handle request ...
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Args:
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host (str): Origin of incoming request.
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Returns:
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_PerHostRatelimiter
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"""
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return self.ratelimiters.setdefault(
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host,
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_PerHostRatelimiter(
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clock=self.clock,
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window_size=self.window_size,
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sleep_limit=self.sleep_limit,
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sleep_msec=self.sleep_msec,
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reject_limit=self.reject_limit,
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concurrent_requests=self.concurrent_requests,
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)
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).ratelimit()
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class _PerHostRatelimiter(object):
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def __init__(self, clock, window_size, sleep_limit, sleep_msec,
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reject_limit, concurrent_requests):
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self.clock = clock
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self.window_size = window_size
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self.sleep_limit = sleep_limit
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self.sleep_msec = sleep_msec
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self.reject_limit = reject_limit
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self.concurrent_requests = concurrent_requests
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self.sleeping_requests = set()
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self.ready_request_queue = collections.OrderedDict()
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self.current_processing = set()
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self.request_times = []
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def is_empty(self):
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time_now = self.clock.time_msec()
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self.request_times[:] = [
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r for r in self.request_times
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if time_now - r < self.window_size
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]
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return not (
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self.ready_request_queue
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or self.sleeping_requests
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or self.current_processing
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or self.request_times
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)
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def ratelimit(self):
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request_id = object()
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def on_enter():
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return self._on_enter(request_id)
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def on_exit(exc_type, exc_val, exc_tb):
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return self._on_exit(request_id)
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return ContextManagerFunction(on_enter, on_exit)
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def _on_enter(self, request_id):
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time_now = self.clock.time_msec()
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self.request_times[:] = [
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r for r in self.request_times
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if time_now - r < self.window_size
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]
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queue_size = len(self.ready_request_queue) + len(self.sleeping_requests)
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if queue_size > self.reject_limit:
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raise LimitExceededError(
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retry_after_ms=int(
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self.window_size / self.sleep_limit
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),
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)
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self.request_times.append(time_now)
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def queue_request():
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if len(self.current_processing) > self.concurrent_requests:
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logger.debug("Ratelimit [%s]: Queue req", id(request_id))
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queue_defer = defer.Deferred()
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self.ready_request_queue[request_id] = queue_defer
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return queue_defer
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else:
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return defer.succeed(None)
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logger.debug(
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"Ratelimit [%s]: len(self.request_times)=%d",
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id(request_id), len(self.request_times),
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)
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if len(self.request_times) > self.sleep_limit:
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logger.debug(
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"Ratelimit [%s]: sleeping req",
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id(request_id),
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)
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ret_defer = sleep(self.sleep_msec/1000.0)
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self.sleeping_requests.add(request_id)
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def on_wait_finished(_):
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logger.debug(
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"Ratelimit [%s]: Finished sleeping",
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id(request_id),
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)
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self.sleeping_requests.discard(request_id)
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queue_defer = queue_request()
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return queue_defer
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ret_defer.addBoth(on_wait_finished)
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else:
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ret_defer = queue_request()
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def on_start(r):
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logger.debug(
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"Ratelimit [%s]: Processing req",
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id(request_id),
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)
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self.current_processing.add(request_id)
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return r
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def on_err(r):
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self.current_processing.discard(request_id)
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return r
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def on_both(r):
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# Ensure that we've properly cleaned up.
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self.sleeping_requests.discard(request_id)
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self.ready_request_queue.pop(request_id, None)
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return r
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ret_defer.addCallbacks(on_start, on_err)
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ret_defer.addBoth(on_both)
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return ret_defer
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def _on_exit(self, request_id):
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logger.debug(
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"Ratelimit [%s]: Processed req",
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id(request_id),
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)
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self.current_processing.discard(request_id)
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try:
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request_id, deferred = self.ready_request_queue.popitem()
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self.current_processing.add(request_id)
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deferred.callback(None)
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except KeyError:
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pass
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class ContextManagerFunction(object):
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def __init__(self, on_enter, on_exit):
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self.on_enter = on_enter
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self.on_exit = on_exit
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def __enter__(self):
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if self.on_enter:
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return self.on_enter()
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def __exit__(self, exc_type, exc_val, exc_tb):
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if self.on_exit:
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return self.on_exit(exc_type, exc_val, exc_tb)
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class TransportLayerServer(object):
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"""Handles incoming federation HTTP requests"""
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@defer.inlineCallbacks
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def _authenticate_request(self, request):
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json_request = {
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"method": request.method,
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"uri": request.uri,
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"destination": self.server_name,
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"signatures": {},
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}
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content = None
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origin = None
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if request.method in ["PUT", "POST"]:
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# TODO: Handle other method types? other content types?
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try:
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content_bytes = request.content.read()
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content = json.loads(content_bytes)
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json_request["content"] = content
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except:
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raise SynapseError(400, "Unable to parse JSON", Codes.BAD_JSON)
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def parse_auth_header(header_str):
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try:
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params = auth.split(" ")[1].split(",")
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param_dict = dict(kv.split("=") for kv in params)
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def strip_quotes(value):
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if value.startswith("\""):
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return value[1:-1]
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else:
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return value
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origin = strip_quotes(param_dict["origin"])
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key = strip_quotes(param_dict["key"])
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sig = strip_quotes(param_dict["sig"])
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return (origin, key, sig)
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except:
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raise SynapseError(
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400, "Malformed Authorization header", Codes.UNAUTHORIZED
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)
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auth_headers = request.requestHeaders.getRawHeaders(b"Authorization")
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if not auth_headers:
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raise SynapseError(
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401, "Missing Authorization headers", Codes.UNAUTHORIZED,
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)
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for auth in auth_headers:
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if auth.startswith("X-Matrix"):
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(origin, key, sig) = parse_auth_header(auth)
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json_request["origin"] = origin
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json_request["signatures"].setdefault(origin, {})[key] = sig
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if not json_request["signatures"]:
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raise SynapseError(
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401, "Missing Authorization headers", Codes.UNAUTHORIZED,
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)
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yield self.keyring.verify_json_for_server(origin, json_request)
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defer.returnValue((origin, content))
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def _with_authentication(self, handler):
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@defer.inlineCallbacks
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def new_handler(request, *args, **kwargs):
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try:
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(origin, content) = yield self._authenticate_request(request)
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with self.ratelimiter.ratelimit(origin) as d:
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yield d
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response = yield handler(
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origin, content, request.args, *args, **kwargs
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)
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except:
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logger.exception("_authenticate_request failed")
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raise
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defer.returnValue(response)
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return new_handler
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def rate_limit_origin(self, handler):
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def new_handler(origin, *args, **kwargs):
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response = yield handler(origin, *args, **kwargs)
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defer.returnValue(response)
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return new_handler()
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@log_function
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def register_received_handler(self, handler):
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""" Register a handler that will be fired when we receive data.
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Args:
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handler (TransportReceivedHandler)
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"""
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self.received_handler = handler
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# This is when someone is trying to send us a bunch of data.
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self.server.register_path(
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"PUT",
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re.compile("^" + PREFIX + "/send/([^/]*)/$"),
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self._with_authentication(self._on_send_request)
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)
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@log_function
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def register_request_handler(self, handler):
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""" Register a handler that will be fired when we get asked for data.
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Args:
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handler (TransportRequestHandler)
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"""
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self.request_handler = handler
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# This is for when someone asks us for everything since version X
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/pull/$"),
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self._with_authentication(
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lambda origin, content, query:
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handler.on_pull_request(query["origin"][0], query["v"])
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)
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)
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# This is when someone asks for a data item for a given server
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# data_id pair.
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/event/([^/]*)/$"),
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self._with_authentication(
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lambda origin, content, query, event_id:
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handler.on_pdu_request(origin, event_id)
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)
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)
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# This is when someone asks for all data for a given context.
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/state/([^/]*)/$"),
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self._with_authentication(
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lambda origin, content, query, context:
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handler.on_context_state_request(
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origin,
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context,
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query.get("event_id", [None])[0],
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)
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)
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)
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/backfill/([^/]*)/$"),
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self._with_authentication(
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lambda origin, content, query, context:
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self._on_backfill_request(
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origin, context, query["v"], query["limit"]
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)
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)
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)
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# This is when we receive a server-server Query
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/query/([^/]*)$"),
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self._with_authentication(
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lambda origin, content, query, query_type:
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handler.on_query_request(
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query_type,
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{k: v[0].decode("utf-8") for k, v in query.items()}
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)
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)
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)
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/make_join/([^/]*)/([^/]*)$"),
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self._with_authentication(
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lambda origin, content, query, context, user_id:
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self._on_make_join_request(
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origin, content, query, context, user_id
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)
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)
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)
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/event_auth/([^/]*)/([^/]*)$"),
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self._with_authentication(
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lambda origin, content, query, context, event_id:
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handler.on_event_auth(
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origin, context, event_id,
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)
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)
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)
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self.server.register_path(
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"PUT",
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re.compile("^" + PREFIX + "/send_join/([^/]*)/([^/]*)$"),
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self._with_authentication(
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lambda origin, content, query, context, event_id:
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self._on_send_join_request(
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origin, content, query,
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)
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)
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)
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self.server.register_path(
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"PUT",
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re.compile("^" + PREFIX + "/invite/([^/]*)/([^/]*)$"),
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self._with_authentication(
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lambda origin, content, query, context, event_id:
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self._on_invite_request(
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origin, content, query,
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)
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)
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)
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self.server.register_path(
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"POST",
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re.compile("^" + PREFIX + "/query_auth/([^/]*)/([^/]*)$"),
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self._with_authentication(
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lambda origin, content, query, context, event_id:
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self._on_query_auth_request(
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origin, content, event_id,
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)
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)
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)
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@defer.inlineCallbacks
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@log_function
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def _on_send_request(self, origin, content, query, transaction_id):
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""" Called on PUT /send/<transaction_id>/
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Args:
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request (twisted.web.http.Request): The HTTP request.
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transaction_id (str): The transaction_id associated with this
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request. This is *not* None.
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Returns:
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Deferred: Results in a tuple of `(code, response)`, where
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`response` is a python dict to be converted into JSON that is
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used as the response body.
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"""
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# Parse the request
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try:
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transaction_data = content
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logger.debug(
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"Decoded %s: %s",
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transaction_id, str(transaction_data)
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)
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# We should ideally be getting this from the security layer.
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# origin = body["origin"]
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# Add some extra data to the transaction dict that isn't included
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# in the request body.
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transaction_data.update(
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transaction_id=transaction_id,
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destination=self.server_name
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)
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except Exception as e:
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logger.exception(e)
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defer.returnValue((400, {"error": "Invalid transaction"}))
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return
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try:
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handler = self.received_handler
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code, response = yield handler.on_incoming_transaction(
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transaction_data
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)
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except:
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logger.exception("on_incoming_transaction failed")
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raise
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defer.returnValue((code, response))
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@log_function
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def _on_backfill_request(self, origin, context, v_list, limits):
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if not limits:
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return defer.succeed(
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(400, {"error": "Did not include limit param"})
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)
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limit = int(limits[-1])
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versions = v_list
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return self.request_handler.on_backfill_request(
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origin, context, versions, limit
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)
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@defer.inlineCallbacks
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@log_function
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def _on_make_join_request(self, origin, content, query, context, user_id):
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content = yield self.request_handler.on_make_join_request(
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context, user_id,
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)
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defer.returnValue((200, content))
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@defer.inlineCallbacks
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@log_function
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def _on_send_join_request(self, origin, content, query):
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content = yield self.request_handler.on_send_join_request(
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origin, content,
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)
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defer.returnValue((200, content))
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@defer.inlineCallbacks
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@log_function
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def _on_invite_request(self, origin, content, query):
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content = yield self.request_handler.on_invite_request(
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origin, content,
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)
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defer.returnValue((200, content))
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@defer.inlineCallbacks
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@log_function
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def _on_query_auth_request(self, origin, content, event_id):
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new_content = yield self.request_handler.on_query_auth_request(
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origin, content, event_id
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)
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defer.returnValue((200, new_content))
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