199 lines
7.3 KiB
Python
199 lines
7.3 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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# the signing key can be specified inline or in a separate file
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if "signing_key" in config:
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self.signing_key = read_signing_keys([config["signing_key"]])
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else:
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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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