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# -*- coding: utf-8 -*-
# Copyright 2014 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 _base import SQLBaseStore
from twisted.internet import defer
import OpenSSL
from syutil.crypto.signing_key import decode_verify_key_bytes
import hashlib
class KeyStore(SQLBaseStore):
"""Persistence for signature verification keys and tls X.509 certificates
"""
@defer.inlineCallbacks
def get_server_certificate(self, server_name):
"""Retrieve the TLS X.509 certificate for the given server
Args:
server_name (bytes): The name of the server.
Returns:
(OpenSSL.crypto.X509): The tls certificate.
"""
tls_certificate_bytes, = yield self._simple_select_one(
table="server_tls_certificates",
keyvalues={"server_name": server_name},
retcols=("tls_certificate",),
)
tls_certificate = OpenSSL.crypto.load_certificate(
OpenSSL.crypto.FILETYPE_ASN1, tls_certificate_bytes,
)
defer.returnValue(tls_certificate)
def store_server_certificate(self, server_name, from_server, time_now_ms,
tls_certificate):
"""Stores the TLS X.509 certificate for the given server
Args:
server_name (str): The name of the server.
from_server (str): Where the certificate was looked up
time_now_ms (int): The time now in milliseconds
tls_certificate (OpenSSL.crypto.X509): The X.509 certificate.
"""
tls_certificate_bytes = OpenSSL.crypto.dump_certificate(
OpenSSL.crypto.FILETYPE_ASN1, tls_certificate
)
fingerprint = hashlib.sha256(tls_certificate_bytes).hexdigest()
return self._simple_insert(
table="server_tls_certificates",
values={
"server_name": server_name,
"fingerprint": fingerprint,
"from_server": from_server,
"ts_added_ms": time_now_ms,
"tls_certificate": buffer(tls_certificate_bytes),
},
)
@defer.inlineCallbacks
def get_server_verify_keys(self, server_name, key_ids):
"""Retrieve the NACL verification key for a given server for the given
key_ids
Args:
server_name (str): The name of the server.
key_ids (list of str): List of key_ids to try and look up.
Returns:
(list of VerifyKey): The verification keys.
"""
sql = (
"SELECT key_id, verify_key FROM server_signature_keys"
" WHERE server_name = ?"
" AND key_id in (" + ",".join("?" for key_id in key_ids) + ")"
)
rows = yield self._execute_and_decode(sql, server_name, *key_ids)
keys = []
for row in rows:
key_id = row["key_id"]
key_bytes = row["verify_key"]
key = decode_verify_key_bytes(key_id, str(key_bytes))
keys.append(key)
defer.returnValue(keys)
def store_server_verify_key(self, server_name, from_server, time_now_ms,
verify_key):
"""Stores a NACL verification key for the given server.
Args:
server_name (str): The name of the server.
key_id (str): The version of the key for the server.
from_server (str): Where the verification key was looked up
ts_now_ms (int): The time now in milliseconds
verification_key (VerifyKey): The NACL verify key.
"""
verify_key_bytes = verify_key.encode()
return self._simple_insert(
table="server_signature_keys",
values={
"server_name": server_name,
"key_id": "%s:%s" % (verify_key.alg, verify_key.version),
"from_server": from_server,
"ts_added_ms": time_now_ms,
"verify_key": buffer(verify_key.encode()),
},
)
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