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Implement locks using create_observer for fetching media and server keys

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This commit is contained in:
Erik Johnston 2015-04-27 14:20:26 +01:00
parent 1c82fbd2eb
commit e701aec2d1
2 changed files with 87 additions and 65 deletions
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148
synapse/crypto/keyring.py
View File

@ -24,6 +24,8 @@ from synapse.api.errors import SynapseError, Codes
from synapse.util.retryutils import get_retry_limiter
from synapse.util.async import create_observer
from OpenSSL import crypto
import logging
@ -38,6 +40,8 @@ class Keyring(object):
self.clock = hs.get_clock()
self.hs = hs
self.key_downloads = {}
@defer.inlineCallbacks
def verify_json_for_server(self, server_name, json_object):
logger.debug("Verifying for %s", server_name)
@ -97,76 +101,92 @@ class Keyring(object):
defer.returnValue(cached[0])
return
# Try to fetch the key from the remote server.
@defer.inlineCallbacks
def fetch_keys():
# Try to fetch the key from the remote server.
limiter = yield get_retry_limiter(
server_name,
self.clock,
self.store,
)
with limiter:
(response, tls_certificate) = yield fetch_server_key(
server_name, self.hs.tls_context_factory
limiter = yield get_retry_limiter(
server_name,
self.clock,
self.store,
)
# Check the response.
x509_certificate_bytes = crypto.dump_certificate(
crypto.FILETYPE_ASN1, tls_certificate
)
if ("signatures" not in response
or server_name not in response["signatures"]):
raise ValueError("Key response not signed by remote server")
if "tls_certificate" not in response:
raise ValueError("Key response missing TLS certificate")
tls_certificate_b64 = response["tls_certificate"]
if encode_base64(x509_certificate_bytes) != tls_certificate_b64:
raise ValueError("TLS certificate doesn't match")
verify_keys = {}
for key_id, key_base64 in response["verify_keys"].items():
if is_signing_algorithm_supported(key_id):
key_bytes = decode_base64(key_base64)
verify_key = decode_verify_key_bytes(key_id, key_bytes)
verify_keys[key_id] = verify_key
for key_id in response["signatures"][server_name]:
if key_id not in response["verify_keys"]:
raise ValueError(
"Key response must include verification keys for all"
" signatures"
)
if key_id in verify_keys:
verify_signed_json(
response,
server_name,
verify_keys[key_id]
with limiter:
(response, tls_certificate) = yield fetch_server_key(
server_name, self.hs.tls_context_factory
)
# Cache the result in the datastore.
# Check the response.
time_now_ms = self.clock.time_msec()
yield self.store.store_server_certificate(
server_name,
server_name,
time_now_ms,
tls_certificate,
)
for key_id, key in verify_keys.items():
yield self.store.store_server_verify_key(
server_name, server_name, time_now_ms, key
x509_certificate_bytes = crypto.dump_certificate(
crypto.FILETYPE_ASN1, tls_certificate
)
for key_id in key_ids:
if key_id in verify_keys:
defer.returnValue(verify_keys[key_id])
return
if ("signatures" not in response
or server_name not in response["signatures"]):
raise ValueError("Key response not signed by remote server")
raise ValueError("No verification key found for given key ids")
if "tls_certificate" not in response:
raise ValueError("Key response missing TLS certificate")
tls_certificate_b64 = response["tls_certificate"]
if encode_base64(x509_certificate_bytes) != tls_certificate_b64:
raise ValueError("TLS certificate doesn't match")
verify_keys = {}
for key_id, key_base64 in response["verify_keys"].items():
if is_signing_algorithm_supported(key_id):
key_bytes = decode_base64(key_base64)
verify_key = decode_verify_key_bytes(key_id, key_bytes)
verify_keys[key_id] = verify_key
for key_id in response["signatures"][server_name]:
if key_id not in response["verify_keys"]:
raise ValueError(
"Key response must include verification keys for all"
" signatures"
)
if key_id in verify_keys:
verify_signed_json(
response,
server_name,
verify_keys[key_id]
)
# Cache the result in the datastore.
time_now_ms = self.clock.time_msec()
yield self.store.store_server_certificate(
server_name,
server_name,
time_now_ms,
tls_certificate,
)
for key_id, key in verify_keys.items():
yield self.store.store_server_verify_key(
server_name, server_name, time_now_ms, key
)
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")
download = self.key_downloads.get(server_name)
if download is None:
download = fetch_keys()
self.key_downloads[server_name] = download
@download.addBoth
def callback(ret):
del self.key_downloads[server_name]
return ret
r = yield create_observer(download)
defer.returnValue(r)

4
synapse/rest/media/v1/base_resource.py
View File

@ -25,6 +25,8 @@ from twisted.internet import defer
from twisted.web.resource import Resource
from twisted.protocols.basic import FileSender
from synapse.util.async import create_observer
import os
import logging
@ -87,7 +89,7 @@ class BaseMediaResource(Resource):
def callback(media_info):
del self.downloads[key]
return media_info
return download
return create_observer(download)
@defer.inlineCallbacks
def _get_remote_media_impl(self, server_name, media_id):