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Do not apply ratelimiting on joins to appservices (#8139)

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Add new method ratelimiter.can_requester_do_action and ensure that appservices are exempt from being ratelimited.

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
Co-authored-by: Erik Johnston <erik@matrix.org>
This commit is contained in:
Will Hunt 2020-08-21 15:07:56 +01:00 committed by Brendan Abolivier
parent 3234d5c305
commit 2df82ae451
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GPG Key ID: 1E015C145F1916CD
4 changed files with 119 additions and 6 deletions
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1
changelog.d/8139.bugfix Normal file
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@ -0,0 +1 @@
Fixes a bug where appservices with ratelimiting disabled would still be ratelimited when joining rooms. This bug was introduced in v1.19.0.

37
synapse/api/ratelimiting.py
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@ -17,6 +17,7 @@ from collections import OrderedDict
from typing import Any, Optional, Tuple
from synapse.api.errors import LimitExceededError
from synapse.types import Requester
from synapse.util import Clock
@ -43,6 +44,42 @@ class Ratelimiter(object):
# * The rate_hz of this particular entry. This can vary per request
self.actions = OrderedDict() # type: OrderedDict[Any, Tuple[float, int, float]]
def can_requester_do_action(
self,
requester: Requester,
rate_hz: Optional[float] = None,
burst_count: Optional[int] = None,
update: bool = True,
_time_now_s: Optional[int] = None,
) -> Tuple[bool, float]:
"""Can the requester perform the action?
Args:
requester: The requester to key off when rate limiting. The user property
will be used.
rate_hz: The long term number of actions that can be performed in a second.
Overrides the value set during instantiation if set.
burst_count: How many actions that can be performed before being limited.
Overrides the value set during instantiation if set.
update: Whether to count this check as performing the action
_time_now_s: The current time. Optional, defaults to the current time according
to self.clock. Only used by tests.
Returns:
A tuple containing:
* A bool indicating if they can perform the action now
* The reactor timestamp for when the action can be performed next.
-1 if rate_hz is less than or equal to zero
"""
# Disable rate limiting of users belonging to any AS that is configured
# not to be rate limited in its registration file (rate_limited: true|false).
if requester.app_service and not requester.app_service.is_rate_limited():
return True, -1.0
return self.can_do_action(
requester.user.to_string(), rate_hz, burst_count, update, _time_now_s
)
def can_do_action(
self,
key: Any,

14
synapse/handlers/room_member.py
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@ -459,9 +459,10 @@ class RoomMemberHandler(object):
if is_host_in_room:
time_now_s = self.clock.time()
allowed, time_allowed = self._join_rate_limiter_local.can_do_action(
requester.user.to_string(),
)
(
allowed,
time_allowed,
) = self._join_rate_limiter_local.can_requester_do_action(requester,)
if not allowed:
raise LimitExceededError(
@ -470,9 +471,10 @@ class RoomMemberHandler(object):
else:
time_now_s = self.clock.time()
allowed, time_allowed = self._join_rate_limiter_remote.can_do_action(
requester.user.to_string(),
)
(
allowed,
time_allowed,
) = self._join_rate_limiter_remote.can_requester_do_action(requester,)
if not allowed:
raise LimitExceededError(

73
tests/api/test_ratelimiting.py
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@ -1,4 +1,6 @@
from synapse.api.ratelimiting import LimitExceededError, Ratelimiter
from synapse.appservice import ApplicationService
from synapse.types import create_requester
from tests import unittest
@ -18,6 +20,77 @@ class TestRatelimiter(unittest.TestCase):
self.assertTrue(allowed)
self.assertEquals(20.0, time_allowed)
def test_allowed_user_via_can_requester_do_action(self):
user_requester = create_requester("@user:example.com")
limiter = Ratelimiter(clock=None, rate_hz=0.1, burst_count=1)
allowed, time_allowed = limiter.can_requester_do_action(
user_requester, _time_now_s=0
)
self.assertTrue(allowed)
self.assertEquals(10.0, time_allowed)
allowed, time_allowed = limiter.can_requester_do_action(
user_requester, _time_now_s=5
)
self.assertFalse(allowed)
self.assertEquals(10.0, time_allowed)
allowed, time_allowed = limiter.can_requester_do_action(
user_requester, _time_now_s=10
)
self.assertTrue(allowed)
self.assertEquals(20.0, time_allowed)
def test_allowed_appservice_ratelimited_via_can_requester_do_action(self):
appservice = ApplicationService(
None, "example.com", id="foo", rate_limited=True,
)
as_requester = create_requester("@user:example.com", app_service=appservice)
limiter = Ratelimiter(clock=None, rate_hz=0.1, burst_count=1)
allowed, time_allowed = limiter.can_requester_do_action(
as_requester, _time_now_s=0
)
self.assertTrue(allowed)
self.assertEquals(10.0, time_allowed)
allowed, time_allowed = limiter.can_requester_do_action(
as_requester, _time_now_s=5
)
self.assertFalse(allowed)
self.assertEquals(10.0, time_allowed)
allowed, time_allowed = limiter.can_requester_do_action(
as_requester, _time_now_s=10
)
self.assertTrue(allowed)
self.assertEquals(20.0, time_allowed)
def test_allowed_appservice_via_can_requester_do_action(self):
appservice = ApplicationService(
None, "example.com", id="foo", rate_limited=False,
)
as_requester = create_requester("@user:example.com", app_service=appservice)
limiter = Ratelimiter(clock=None, rate_hz=0.1, burst_count=1)
allowed, time_allowed = limiter.can_requester_do_action(
as_requester, _time_now_s=0
)
self.assertTrue(allowed)
self.assertEquals(-1, time_allowed)
allowed, time_allowed = limiter.can_requester_do_action(
as_requester, _time_now_s=5
)
self.assertTrue(allowed)
self.assertEquals(-1, time_allowed)
allowed, time_allowed = limiter.can_requester_do_action(
as_requester, _time_now_s=10
)
self.assertTrue(allowed)
self.assertEquals(-1, time_allowed)
def test_allowed_via_ratelimit(self):
limiter = Ratelimiter(clock=None, rate_hz=0.1, burst_count=1)