mirror of
https://mau.dev/maunium/synapse.git
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130 lines
4.9 KiB
Python
130 lines
4.9 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2020 The Matrix.org Foundation C.I.C.
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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 hashlib import sha256
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from typing import List, Optional
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import attr
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from netaddr import IPSet
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from ._base import Config, ConfigError
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@attr.s
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class ShardedFederationSendingConfig:
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"""Algorithm for choosing which federation sender instance is responsible
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for which destionation host.
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"""
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instances = attr.ib(type=List[str])
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def should_send_to(self, instance_name: str, destination: str) -> bool:
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"""Whether this instance is responsible for sending transcations for
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the given host.
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"""
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# If multiple federation senders are not defined we always return true.
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if not self.instances or len(self.instances) == 1:
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return True
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# We shard by taking the hash, modulo it by the number of federation
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# senders and then checking whether this instance matches the instance
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# at that index.
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#
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# (Technically this introduces some bias and is not entirely uniform, but
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# since the hash is so large the bias is ridiculously small).
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dest_hash = sha256(destination.encode("utf8")).digest()
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dest_int = int.from_bytes(dest_hash, byteorder="little")
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remainder = dest_int % (len(self.instances))
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return self.instances[remainder] == instance_name
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class FederationConfig(Config):
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section = "federation"
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def read_config(self, config, **kwargs):
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# Whether to send federation traffic out in this process. This only
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# applies to some federation traffic, and so shouldn't be used to
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# "disable" federation
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self.send_federation = config.get("send_federation", True)
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federation_sender_instances = config.get("federation_sender_instances") or []
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self.federation_shard_config = ShardedFederationSendingConfig(
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federation_sender_instances
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)
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# FIXME: federation_domain_whitelist needs sytests
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self.federation_domain_whitelist = None # type: Optional[dict]
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federation_domain_whitelist = config.get("federation_domain_whitelist", None)
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if federation_domain_whitelist is not None:
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# turn the whitelist into a hash for speed of lookup
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self.federation_domain_whitelist = {}
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for domain in federation_domain_whitelist:
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self.federation_domain_whitelist[domain] = True
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self.federation_ip_range_blacklist = config.get(
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"federation_ip_range_blacklist", []
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)
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# Attempt to create an IPSet from the given ranges
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try:
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self.federation_ip_range_blacklist = IPSet(
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self.federation_ip_range_blacklist
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)
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# Always blacklist 0.0.0.0, ::
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self.federation_ip_range_blacklist.update(["0.0.0.0", "::"])
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except Exception as e:
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raise ConfigError(
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"Invalid range(s) provided in federation_ip_range_blacklist: %s" % e
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)
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def generate_config_section(self, config_dir_path, server_name, **kwargs):
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return """\
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# Restrict federation to the following whitelist of domains.
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# N.B. we recommend also firewalling your federation listener to limit
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# inbound federation traffic as early as possible, rather than relying
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# purely on this application-layer restriction. If not specified, the
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# default is to whitelist everything.
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#
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#federation_domain_whitelist:
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# - lon.example.com
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# - nyc.example.com
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# - syd.example.com
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# Prevent federation requests from being sent to the following
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# blacklist IP address CIDR ranges. If this option is not specified, or
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# specified with an empty list, no ip range blacklist will be enforced.
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#
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# As of Synapse v1.4.0 this option also affects any outbound requests to identity
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# servers provided by user input.
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#
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# (0.0.0.0 and :: are always blacklisted, whether or not they are explicitly
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# listed here, since they correspond to unroutable addresses.)
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#
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federation_ip_range_blacklist:
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- '127.0.0.0/8'
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- '10.0.0.0/8'
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- '172.16.0.0/12'
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- '192.168.0.0/16'
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- '100.64.0.0/10'
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- '169.254.0.0/16'
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- '::1/128'
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- 'fe80::/64'
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- 'fc00::/7'
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"""
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