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# -*- coding: utf-8 -*-
# Copyright 2015 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.
import os
from ._base import Config, ConfigError
import syutil.crypto.signing_key
from syutil.crypto.signing_key import (
is_signing_algorithm_supported, decode_verify_key_bytes
)
from syutil.base64util import decode_base64
class KeyConfig(Config):
def __init__(self, args):
super(KeyConfig, self).__init__(args)
self.signing_key = self.read_signing_key(args.signing_key_path)
self.old_signing_keys = self.read_old_signing_keys(
args.old_signing_key_path
)
self.key_refresh_interval = args.key_refresh_interval
self.perspectives = self.read_perspectives(
args.perspectives_config_path
)
@classmethod
def add_arguments(cls, parser):
super(KeyConfig, cls).add_arguments(parser)
key_group = parser.add_argument_group("keys")
key_group.add_argument("--signing-key-path",
help="The signing key to sign messages with")
key_group.add_argument("--old-signing-key-path",
help="The keys that the server used to sign"
" sign messages with but won't use"
" to sign new messages. E.g. it has"
" lost its private key")
key_group.add_argument("--key-refresh-interval",
default=24 * 60 * 60 * 1000, # 1 Day
help="How long a key response is valid for."
" Used to set the exipiry in /key/v2/."
" Controls how frequently servers will"
" query what keys are still valid")
key_group.add_argument("--perspectives-config-path",
help="The trusted servers to download signing"
" keys from")
def read_perspectives(self, perspectives_config_path):
config = self.read_yaml_file(
perspectives_config_path, "perspectives_config_path"
)
servers = {}
for server_name, server_config in config["servers"].items():
for key_id, key_data in server_config["verify_keys"].items():
if is_signing_algorithm_supported(key_id):
key_base64 = key_data["key"]
key_bytes = decode_base64(key_base64)
verify_key = decode_verify_key_bytes(key_id, key_bytes)
servers.setdefault(server_name, {})[key_id] = verify_key
return servers
def read_signing_key(self, signing_key_path):
signing_keys = self.read_file(signing_key_path, "signing_key")
try:
return syutil.crypto.signing_key.read_signing_keys(
signing_keys.splitlines(True)
)
except Exception:
raise ConfigError(
"Error reading signing_key."
" Try running again with --generate-config"
)
def read_old_signing_keys(self, old_signing_key_path):
old_signing_keys = self.read_file(
old_signing_key_path, "old_signing_key"
)
try:
return syutil.crypto.signing_key.read_old_signing_keys(
old_signing_keys.splitlines(True)
)
except Exception:
raise ConfigError(
"Error reading old signing keys."
)
@classmethod
def generate_config(cls, args, config_dir_path):
super(KeyConfig, cls).generate_config(args, config_dir_path)
base_key_name = os.path.join(config_dir_path, args.server_name)
args.pid_file = os.path.abspath(args.pid_file)
if not args.signing_key_path:
args.signing_key_path = base_key_name + ".signing.key"
if not os.path.exists(args.signing_key_path):
with open(args.signing_key_path, "w") as signing_key_file:
syutil.crypto.signing_key.write_signing_keys(
signing_key_file,
(syutil.crypto.signing_key.generate_signing_key("auto"),),
)
else:
signing_keys = cls.read_file(args.signing_key_path, "signing_key")
if len(signing_keys.split("\n")[0].split()) == 1:
# handle keys in the old format.
key = syutil.crypto.signing_key.decode_signing_key_base64(
syutil.crypto.signing_key.NACL_ED25519,
"auto",
signing_keys.split("\n")[0]
)
with open(args.signing_key_path, "w") as signing_key_file:
syutil.crypto.signing_key.write_signing_keys(
signing_key_file,
(key,),
)
if not args.old_signing_key_path:
args.old_signing_key_path = base_key_name + ".old.signing.keys"
if not os.path.exists(args.old_signing_key_path):
with open(args.old_signing_key_path, "w"):
pass
if not args.perspectives_config_path:
args.perspectives_config_path = base_key_name + ".perspectives"
if not os.path.exists(args.perspectives_config_path):
with open(args.perspectives_config_path, "w") as perspectives_file:
perspectives_file.write(
'servers:\n'
' matrix.org:\n'
' verify_keys:\n'
' "ed25519:auto":\n'
' key: "Noi6WqcDj0QmPxCNQqgezwTlBKrfqehY1u2FyWP9uYw"\n'
)
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