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Implement remote key lookup api

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This commit is contained in:
Mark Haines 2015-04-22 14:21:08 +01:00
parent 3ba522bb23
commit f30d47c876
7 changed files with 252 additions and 61 deletions
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75
synapse/crypto/keyring.py
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@ -15,7 +15,9 @@
from synapse.crypto.keyclient import fetch_server_key
from twisted.internet import defer
from syutil.crypto.jsonsign import verify_signed_json, signature_ids
from syutil.crypto.jsonsign import (
verify_signed_json, signature_ids, sign_json, encode_canonical_json
)
from syutil.crypto.signing_key import (
is_signing_algorithm_supported, decode_verify_key_bytes
)
@ -26,6 +28,8 @@ from synapse.util.retryutils import get_retry_limiter
from OpenSSL import crypto
import urllib
import hashlib
import logging
@ -37,6 +41,7 @@ class Keyring(object):
self.store = hs.get_datastore()
self.clock = hs.get_clock()
self.client = hs.get_http_client()
self.config = hs.get_config()
self.perspective_servers = {}
self.hs = hs
@ -127,7 +132,6 @@ class Keyring(object):
server_name, key_ids
)
for key_id in key_ids:
if key_id in keys:
defer.returnValue(keys[key_id])
@ -142,17 +146,18 @@ class Keyring(object):
perspective_name, self.clock, self.store
)
responses = yield self.client.post_json(
destination=perspective_name,
path=b"/_matrix/key/v2/query",
data={u"server_keys": {server_name: list(key_ids)}},
)
with limiter:
responses = yield self.client.post_json(
destination=perspective_name,
path=b"/_matrix/key/v2/query",
data={u"server_keys": {server_name: list(key_ids)}},
)
keys = dict()
keys = {}
for response in responses:
if (u"signatures" not in response
or perspective_name not in response[u"signatures"]):
or perspective_name not in response[u"signatures"]):
raise ValueError(
"Key response not signed by perspective server"
" %r" % (perspective_name,)
@ -181,7 +186,9 @@ class Keyring(object):
" server %r" % (perspective_name,)
)
response_keys = process_v2_response(self, server_name, key_ids)
response_keys = yield self.process_v2_response(
server_name, perspective_name, response
)
keys.update(response_keys)
@ -202,15 +209,15 @@ class Keyring(object):
if requested_key_id in keys:
continue
(response_json, tls_certificate) = yield fetch_server_key(
(response, tls_certificate) = yield fetch_server_key(
server_name, self.hs.tls_context_factory,
path="/_matrix/key/v2/server/%s" % (
path=(b"/_matrix/key/v2/server/%s" % (
urllib.quote(requested_key_id),
),
)).encode("ascii"),
)
if (u"signatures" not in response
or server_name not in response[u"signatures"]):
or server_name not in response[u"signatures"]):
raise ValueError("Key response not signed by remote server")
if "tls_fingerprints" not in response:
@ -223,17 +230,18 @@ class Keyring(object):
sha256_fingerprint_b64 = encode_base64(sha256_fingerprint)
response_sha256_fingerprints = set()
for fingerprint in response_json[u"tls_fingerprints"]:
for fingerprint in response[u"tls_fingerprints"]:
if u"sha256" in fingerprint:
response_sha256_fingerprints.add(fingerprint[u"sha256"])
if sha256_fingerprint not in response_sha256_fingerprints:
if sha256_fingerprint_b64 not in response_sha256_fingerprints:
raise ValueError("TLS certificate not allowed by fingerprints")
response_keys = yield self.process_v2_response(
server_name=server_name,
from_server=server_name,
response_json=response_json,
requested_id=requested_key_id,
response_json=response,
)
keys.update(response_keys)
@ -244,19 +252,15 @@ class Keyring(object):
verify_keys=keys,
)
for key_id in key_ids:
if key_id in verify_keys:
defer.returnValue(verify_keys[key_id])
return
raise ValueError("No verification key found for given key ids")
defer.returnValue(keys)
@defer.inlineCallbacks
def process_v2_response(self, server_name, from_server, json_response):
time_now_ms = clock.time_msec()
def process_v2_response(self, server_name, from_server, response_json,
requested_id=None):
time_now_ms = self.clock.time_msec()
response_keys = {}
verify_keys = {}
for key_id, key_data in response["verify_keys"].items():
for key_id, key_data in response_json["verify_keys"].items():
if is_signing_algorithm_supported(key_id):
key_base64 = key_data["key"]
key_bytes = decode_base64(key_base64)
@ -264,7 +268,7 @@ class Keyring(object):
verify_keys[key_id] = verify_key
old_verify_keys = {}
for key_id, key_data in response["verify_keys"].items():
for key_id, key_data in response_json["old_verify_keys"].items():
if is_signing_algorithm_supported(key_id):
key_base64 = key_data["key"]
key_bytes = decode_base64(key_base64)
@ -273,21 +277,21 @@ class Keyring(object):
verify_key.time_added = time_now_ms
old_verify_keys[key_id] = verify_key
for key_id in response["signatures"][server_name]:
if key_id not in response["verify_keys"]:
for key_id in response_json["signatures"][server_name]:
if key_id not in response_json["verify_keys"]:
raise ValueError(
"Key response must include verification keys for all"
" signatures"
)
if key_id in verify_keys:
verify_signed_json(
response,
response_json,
server_name,
verify_keys[key_id]
)
signed_key_json = sign_json(
response,
response_json,
self.config.server_name,
self.config.signing_key[0],
)
@ -295,7 +299,9 @@ class Keyring(object):
signed_key_json_bytes = encode_canonical_json(signed_key_json)
ts_valid_until_ms = signed_key_json[u"valid_until"]
updated_key_ids = set([requested_key_id])
updated_key_ids = set()
if requested_id is not None:
updated_key_ids.add(requested_id)
updated_key_ids.update(verify_keys)
updated_key_ids.update(old_verify_keys)
@ -307,8 +313,8 @@ class Keyring(object):
server_name=server_name,
key_id=key_id,
from_server=server_name,
ts_now_ms=ts_now_ms,
ts_valid_until_ms=valid_until,
ts_now_ms=time_now_ms,
ts_expires_ms=ts_valid_until_ms,
key_json_bytes=signed_key_json_bytes,
)
@ -373,7 +379,6 @@ class Keyring(object):
verify_keys[key_id]
)
yield self.store.store_server_certificate(
server_name,
server_name,