mirror of
https://mau.dev/maunium/synapse.git
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fd463b4f5d
Make it so that most options in the config are optional, and commented out in the generated config. The reasons this is a good thing are as follows: * If we decide that we should change the default for an option, we can do so, and only those admins that have deliberately chosen to override that option will be stuck on the old setting. * It moves us towards a point where we can get rid of the super-surprising feature of synapse where the default settings for the config come from the generated yaml. * It makes setting up a test config for unit testing an order of magnitude easier (see forthcoming PR). * It makes the generated config more consistent, and hopefully easier for users to understand.
194 lines
7.1 KiB
Python
194 lines
7.1 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015, 2016 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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import hashlib
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import logging
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import os
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from signedjson.key import (
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NACL_ED25519,
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decode_signing_key_base64,
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decode_verify_key_bytes,
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generate_signing_key,
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is_signing_algorithm_supported,
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read_signing_keys,
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write_signing_keys,
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)
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from unpaddedbase64 import decode_base64
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from synapse.util.stringutils import random_string, random_string_with_symbols
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from ._base import Config, ConfigError
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logger = logging.getLogger(__name__)
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class KeyConfig(Config):
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def read_config(self, config):
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self.signing_key = self.read_signing_key(config["signing_key_path"])
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self.old_signing_keys = self.read_old_signing_keys(
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config.get("old_signing_keys", {})
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)
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self.key_refresh_interval = self.parse_duration(
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config.get("key_refresh_interval", "1d"),
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)
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self.perspectives = self.read_perspectives(
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config.get("perspectives", {}).get("servers", {
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"matrix.org": {"verify_keys": {
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"ed25519:auto": {
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"key": "Noi6WqcDj0QmPxCNQqgezwTlBKrfqehY1u2FyWP9uYw",
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}
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}}
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})
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)
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self.macaroon_secret_key = config.get(
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"macaroon_secret_key", self.registration_shared_secret
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)
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if not self.macaroon_secret_key:
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# Unfortunately, there are people out there that don't have this
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# set. Lets just be "nice" and derive one from their secret key.
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logger.warn("Config is missing macaroon_secret_key")
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seed = bytes(self.signing_key[0])
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self.macaroon_secret_key = hashlib.sha256(seed).digest()
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self.expire_access_token = config.get("expire_access_token", False)
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# a secret which is used to calculate HMACs for form values, to stop
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# falsification of values
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self.form_secret = config.get("form_secret", None)
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def default_config(self, config_dir_path, server_name, generate_secrets=False,
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**kwargs):
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base_key_name = os.path.join(config_dir_path, server_name)
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if generate_secrets:
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macaroon_secret_key = 'macaroon_secret_key: "%s"' % (
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random_string_with_symbols(50),
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)
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form_secret = 'form_secret: "%s"' % random_string_with_symbols(50)
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else:
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macaroon_secret_key = "# macaroon_secret_key: <PRIVATE STRING>"
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form_secret = "# form_secret: <PRIVATE STRING>"
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return """\
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# a secret which is used to sign access tokens. If none is specified,
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# the registration_shared_secret is used, if one is given; otherwise,
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# a secret key is derived from the signing key.
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#
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%(macaroon_secret_key)s
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# Used to enable access token expiration.
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#
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#expire_access_token: False
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# a secret which is used to calculate HMACs for form values, to stop
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# falsification of values. Must be specified for the User Consent
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# forms to work.
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#
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%(form_secret)s
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## Signing Keys ##
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# Path to the signing key to sign messages with
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#
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signing_key_path: "%(base_key_name)s.signing.key"
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# The keys that the server used to sign messages with but won't use
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# to sign new messages. E.g. it has lost its private key
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#
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#old_signing_keys:
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# "ed25519:auto":
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# # Base64 encoded public key
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# key: "The public part of your old signing key."
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# # Millisecond POSIX timestamp when the key expired.
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# expired_ts: 123456789123
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# How long key response published by this server is valid for.
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# Used to set the valid_until_ts in /key/v2 APIs.
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# Determines how quickly servers will query to check which keys
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# are still valid.
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#
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#key_refresh_interval: 1d
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# The trusted servers to download signing keys from.
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#
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#perspectives:
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# servers:
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# "matrix.org":
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# verify_keys:
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# "ed25519:auto":
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# key: "Noi6WqcDj0QmPxCNQqgezwTlBKrfqehY1u2FyWP9uYw"
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""" % locals()
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def read_perspectives(self, perspectives_servers):
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servers = {}
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for server_name, server_config in perspectives_servers.items():
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for key_id, key_data in server_config["verify_keys"].items():
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if is_signing_algorithm_supported(key_id):
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key_base64 = key_data["key"]
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key_bytes = decode_base64(key_base64)
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verify_key = decode_verify_key_bytes(key_id, key_bytes)
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servers.setdefault(server_name, {})[key_id] = verify_key
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return servers
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def read_signing_key(self, signing_key_path):
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signing_keys = self.read_file(signing_key_path, "signing_key")
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try:
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return read_signing_keys(signing_keys.splitlines(True))
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except Exception as e:
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raise ConfigError(
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"Error reading signing_key: %s" % (str(e))
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)
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def read_old_signing_keys(self, old_signing_keys):
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keys = {}
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for key_id, key_data in old_signing_keys.items():
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if is_signing_algorithm_supported(key_id):
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key_base64 = key_data["key"]
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key_bytes = decode_base64(key_base64)
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verify_key = decode_verify_key_bytes(key_id, key_bytes)
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verify_key.expired_ts = key_data["expired_ts"]
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keys[key_id] = verify_key
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else:
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raise ConfigError(
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"Unsupported signing algorithm for old key: %r" % (key_id,)
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)
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return keys
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def generate_files(self, config):
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signing_key_path = config["signing_key_path"]
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if not self.path_exists(signing_key_path):
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with open(signing_key_path, "w") as signing_key_file:
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key_id = "a_" + random_string(4)
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write_signing_keys(
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signing_key_file, (generate_signing_key(key_id),),
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)
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else:
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signing_keys = self.read_file(signing_key_path, "signing_key")
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if len(signing_keys.split("\n")[0].split()) == 1:
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# handle keys in the old format.
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key_id = "a_" + random_string(4)
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key = decode_signing_key_base64(
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NACL_ED25519, key_id, signing_keys.split("\n")[0]
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)
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with open(signing_key_path, "w") as signing_key_file:
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write_signing_keys(
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signing_key_file, (key,),
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)
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