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# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from typing import Any, Dict, Optional, cast
import attr
from synapse.types import JsonDict
from ._base import Config
@attr.s(slots=True, frozen=True, auto_attribs=True)
class RatelimitSettings:
key: str
per_second: float
burst_count: int
@classmethod
def parse(
cls,
config: Dict[str, Any],
key: str,
defaults: Optional[Dict[str, float]] = None,
) -> "RatelimitSettings":
"""Parse config[key] as a new-style rate limiter config.
The key may refer to a nested dictionary using a full stop (.) to separate
each nested key. For example, use the key "a.b.c" to parse the following:
a:
b:
c:
per_second: 10
burst_count: 200
If this lookup fails, we'll fallback to the defaults.
"""
defaults = defaults or {"per_second": 0.17, "burst_count": 3.0}
rl_config = config
for part in key.split("."):
rl_config = rl_config.get(part, {})
# By this point we should have hit the rate limiter parameters.
# We don't actually check this though!
rl_config = cast(Dict[str, float], rl_config)
return cls(
key=key,
per_second=rl_config.get("per_second", defaults["per_second"]),
burst_count=int(rl_config.get("burst_count", defaults["burst_count"])),
)
@attr.s(auto_attribs=True)
class FederationRatelimitSettings:
window_size: int = 1000
sleep_limit: int = 10
sleep_delay: int = 500
reject_limit: int = 50
concurrent: int = 3
class RatelimitConfig(Config):
section = "ratelimiting"
def read_config(self, config: JsonDict, **kwargs: Any) -> None:
# Load the new-style messages config if it exists. Otherwise fall back
# to the old method.
if "rc_message" in config:
self.rc_message = RatelimitSettings.parse(
config, "rc_message", defaults={"per_second": 0.2, "burst_count": 10.0}
)
else:
self.rc_message = RatelimitSettings(
key="rc_messages",
per_second=config.get("rc_messages_per_second", 0.2),
burst_count=config.get("rc_message_burst_count", 10.0),
)
# Load the new-style federation config, if it exists. Otherwise, fall
# back to the old method.
if "rc_federation" in config:
self.rc_federation = FederationRatelimitSettings(**config["rc_federation"])
else:
self.rc_federation = FederationRatelimitSettings(
**{
k: v
for k, v in {
"window_size": config.get("federation_rc_window_size"),
"sleep_limit": config.get("federation_rc_sleep_limit"),
"sleep_delay": config.get("federation_rc_sleep_delay"),
"reject_limit": config.get("federation_rc_reject_limit"),
"concurrent": config.get("federation_rc_concurrent"),
}.items()
if v is not None
}
)
self.rc_registration = RatelimitSettings.parse(config, "rc_registration", {})
self.rc_registration_token_validity = RatelimitSettings.parse(
config,
"rc_registration_token_validity",
defaults={"per_second": 0.1, "burst_count": 5},
)
# It is reasonable to login with a bunch of devices at once (i.e. when
# setting up an account), but it is *not* valid to continually be
# logging into new devices.
self.rc_login_address = RatelimitSettings.parse(
config,
"rc_login.address",
defaults={"per_second": 0.003, "burst_count": 5},
)
self.rc_login_account = RatelimitSettings.parse(
config,
"rc_login.account",
defaults={"per_second": 0.003, "burst_count": 5},
)
self.rc_login_failed_attempts = RatelimitSettings.parse(
config,
"rc_login.failed_attempts",
{},
)
self.federation_rr_transactions_per_room_per_second = config.get(
"federation_rr_transactions_per_room_per_second", 50
)
self.rc_admin_redaction = None
if "rc_admin_redaction" in config:
self.rc_admin_redaction = RatelimitSettings.parse(
config, "rc_admin_redaction", {}
)
self.rc_joins_local = RatelimitSettings.parse(
config,
"rc_joins.local",
defaults={"per_second": 0.1, "burst_count": 10},
)
self.rc_joins_remote = RatelimitSettings.parse(
config,
"rc_joins.remote",
defaults={"per_second": 0.01, "burst_count": 10},
)
# Track the rate of joins to a given room. If there are too many, temporarily
# prevent local joins and remote joins via this server.
self.rc_joins_per_room = RatelimitSettings.parse(
config,
"rc_joins_per_room",
defaults={"per_second": 1, "burst_count": 10},
)
# Ratelimit cross-user key requests:
# * For local requests this is keyed by the sending device.
# * For requests received over federation this is keyed by the origin.
#
# Note that this isn't exposed in the configuration as it is obscure.
self.rc_key_requests = RatelimitSettings.parse(
config,
"rc_key_requests",
defaults={"per_second": 20, "burst_count": 100},
)
self.rc_3pid_validation = RatelimitSettings.parse(
config,
"rc_3pid_validation",
defaults={"per_second": 0.003, "burst_count": 5},
)
self.rc_invites_per_room = RatelimitSettings.parse(
config,
"rc_invites.per_room",
defaults={"per_second": 0.3, "burst_count": 10},
)
self.rc_invites_per_user = RatelimitSettings.parse(
config,
"rc_invites.per_user",
defaults={"per_second": 0.003, "burst_count": 5},
)
self.rc_invites_per_issuer = RatelimitSettings.parse(
config,
"rc_invites.per_issuer",
defaults={"per_second": 0.3, "burst_count": 10},
)
self.rc_third_party_invite = RatelimitSettings.parse(
config,
"rc_third_party_invite",
defaults={"per_second": 0.0025, "burst_count": 5},
)
# Ratelimit create media requests:
self.rc_media_create = RatelimitSettings.parse(
config,
"rc_media_create",
defaults={"per_second": 10, "burst_count": 50},
)
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