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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 Dict, Optional
import attr
from ._base import Config
class RateLimitConfig:
def __init__(
self,
config: Dict[str, float],
defaults: Optional[Dict[str, float]] = None,
):
defaults = defaults or {"per_second": 0.17, "burst_count": 3.0}
self.per_second = config.get("per_second", defaults["per_second"])
self.burst_count = int(config.get("burst_count", defaults["burst_count"]))
@attr.s(auto_attribs=True)
class FederationRateLimitConfig:
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, **kwargs):
# Load the new-style messages config if it exists. Otherwise fall back
# to the old method.
if "rc_message" in config:
self.rc_message = RateLimitConfig(
config["rc_message"], defaults={"per_second": 0.2, "burst_count": 10.0}
)
else:
self.rc_message = RateLimitConfig(
{
"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 = FederationRateLimitConfig(**config["rc_federation"])
else:
self.rc_federation = FederationRateLimitConfig(
**{
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 = RateLimitConfig(config.get("rc_registration", {}))
self.rc_registration_token_validity = RateLimitConfig(
config.get("rc_registration_token_validity", {}),
defaults={"per_second": 0.1, "burst_count": 5},
)
rc_login_config = config.get("rc_login", {})
self.rc_login_address = RateLimitConfig(rc_login_config.get("address", {}))
self.rc_login_account = RateLimitConfig(rc_login_config.get("account", {}))
self.rc_login_failed_attempts = RateLimitConfig(
rc_login_config.get("failed_attempts", {})
)
self.federation_rr_transactions_per_room_per_second = config.get(
"federation_rr_transactions_per_room_per_second", 50
)
rc_admin_redaction = config.get("rc_admin_redaction")
self.rc_admin_redaction = None
if rc_admin_redaction:
self.rc_admin_redaction = RateLimitConfig(rc_admin_redaction)
self.rc_joins_local = RateLimitConfig(
config.get("rc_joins", {}).get("local", {}),
defaults={"per_second": 0.1, "burst_count": 10},
)
self.rc_joins_remote = RateLimitConfig(
config.get("rc_joins", {}).get("remote", {}),
defaults={"per_second": 0.01, "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 = RateLimitConfig(
config.get("rc_key_requests", {}),
defaults={"per_second": 20, "burst_count": 100},
)
self.rc_3pid_validation = RateLimitConfig(
config.get("rc_3pid_validation") or {},
defaults={"per_second": 0.003, "burst_count": 5},
)
self.rc_invites_per_room = RateLimitConfig(
config.get("rc_invites", {}).get("per_room", {}),
defaults={"per_second": 0.3, "burst_count": 10},
)
self.rc_invites_per_user = RateLimitConfig(
config.get("rc_invites", {}).get("per_user", {}),
defaults={"per_second": 0.003, "burst_count": 5},
)
self.rc_third_party_invite = RateLimitConfig(
config.get("rc_third_party_invite", {}),
defaults={
"per_second": self.rc_message.per_second,
"burst_count": self.rc_message.burst_count,
},
)
def generate_config_section(self, **kwargs):
return """\
## Ratelimiting ##
# Ratelimiting settings for client actions (registration, login, messaging).
#
# Each ratelimiting configuration is made of two parameters:
# - per_second: number of requests a client can send per second.
# - burst_count: number of requests a client can send before being throttled.
#
# Synapse currently uses the following configurations:
# - one for messages that ratelimits sending based on the account the client
# is using
# - one for registration that ratelimits registration requests based on the
# client's IP address.
# - one for checking the validity of registration tokens that ratelimits
# requests based on the client's IP address.
# - one for login that ratelimits login requests based on the client's IP
# address.
# - one for login that ratelimits login requests based on the account the
# client is attempting to log into.
# - one for login that ratelimits login requests based on the account the
# client is attempting to log into, based on the amount of failed login
# attempts for this account.
# - one for ratelimiting redactions by room admins. If this is not explicitly
# set then it uses the same ratelimiting as per rc_message. This is useful
# to allow room admins to deal with abuse quickly.
# - two for ratelimiting number of rooms a user can join, "local" for when
# users are joining rooms the server is already in (this is cheap) vs
# "remote" for when users are trying to join rooms not on the server (which
# can be more expensive)
# - one for ratelimiting how often a user or IP can attempt to validate a 3PID.
# - two for ratelimiting how often invites can be sent in a room or to a
# specific user.
# - one for ratelimiting 3PID invites (i.e. invites sent to a third-party ID
# such as an email address or a phone number) based on the account that's
# sending the invite.
#
# The defaults are as shown below.
#
#rc_message:
# per_second: 0.2
# burst_count: 10
#
#rc_registration:
# per_second: 0.17
# burst_count: 3
#
#rc_registration_token_validity:
# per_second: 0.1
# burst_count: 5
#
#rc_login:
# address:
# per_second: 0.17
# burst_count: 3
# account:
# per_second: 0.17
# burst_count: 3
# failed_attempts:
# per_second: 0.17
# burst_count: 3
#
#rc_admin_redaction:
# per_second: 1
# burst_count: 50
#
#rc_joins:
# local:
# per_second: 0.1
# burst_count: 10
# remote:
# per_second: 0.01
# burst_count: 10
#
#rc_3pid_validation:
# per_second: 0.003
# burst_count: 5
#
#rc_invites:
# per_room:
# per_second: 0.3
# burst_count: 10
# per_user:
# per_second: 0.003
# burst_count: 5
#
#rc_third_party_invite:
# per_second: 0.2
# burst_count: 10
# Ratelimiting settings for incoming federation
#
# The rc_federation configuration is made up of the following settings:
# - window_size: window size in milliseconds
# - sleep_limit: number of federation requests from a single server in
# a window before the server will delay processing the request.
# - sleep_delay: duration in milliseconds to delay processing events
# from remote servers by if they go over the sleep limit.
# - reject_limit: maximum number of concurrent federation requests
# allowed from a single server
# - concurrent: number of federation requests to concurrently process
# from a single server
#
# The defaults are as shown below.
#
#rc_federation:
# window_size: 1000
# sleep_limit: 10
# sleep_delay: 500
# reject_limit: 50
# concurrent: 3
# Target outgoing federation transaction frequency for sending read-receipts,
# per-room.
#
# If we end up trying to send out more read-receipts, they will get buffered up
# into fewer transactions.
#
#federation_rr_transactions_per_room_per_second: 50
"""
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