Implement locks using create_observer for fetching media and server keys
Erik Johnston
parent
1c82fbd2eb
commit
e701aec2d1
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@ -24,6 +24,8 @@ from synapse.api.errors import SynapseError, Codes
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from synapse.util.retryutils import get_retry_limiter
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from synapse.util.async import create_observer
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from OpenSSL import crypto
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import logging
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@ -38,6 +40,8 @@ class Keyring(object):
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self.clock = hs.get_clock()
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self.hs = hs
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self.key_downloads = {}
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@defer.inlineCallbacks
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def verify_json_for_server(self, server_name, json_object):
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logger.debug("Verifying for %s", server_name)
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@ -97,76 +101,92 @@ class Keyring(object):
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defer.returnValue(cached[0])
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return
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# Try to fetch the key from the remote server.
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@defer.inlineCallbacks
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def fetch_keys():
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# Try to fetch the key from the remote server.
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limiter = yield get_retry_limiter(
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server_name,
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self.clock,
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self.store,
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)
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with limiter:
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(response, tls_certificate) = yield fetch_server_key(
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server_name, self.hs.tls_context_factory
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limiter = yield get_retry_limiter(
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server_name,
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self.clock,
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self.store,
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)
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# Check the response.
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x509_certificate_bytes = crypto.dump_certificate(
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crypto.FILETYPE_ASN1, tls_certificate
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)
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if ("signatures" not in response
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or server_name not in response["signatures"]):
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raise ValueError("Key response not signed by remote server")
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if "tls_certificate" not in response:
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raise ValueError("Key response missing TLS certificate")
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tls_certificate_b64 = response["tls_certificate"]
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if encode_base64(x509_certificate_bytes) != tls_certificate_b64:
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raise ValueError("TLS certificate doesn't match")
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verify_keys = {}
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for key_id, key_base64 in response["verify_keys"].items():
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if is_signing_algorithm_supported(key_id):
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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_keys[key_id] = verify_key
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for key_id in response["signatures"][server_name]:
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if key_id not in response["verify_keys"]:
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raise ValueError(
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"Key response must include verification keys for all"
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" signatures"
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)
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if key_id in verify_keys:
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verify_signed_json(
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response,
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server_name,
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verify_keys[key_id]
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with limiter:
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(response, tls_certificate) = yield fetch_server_key(
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server_name, self.hs.tls_context_factory
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)
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# Cache the result in the datastore.
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# Check the response.
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time_now_ms = self.clock.time_msec()
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yield self.store.store_server_certificate(
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server_name,
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server_name,
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time_now_ms,
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tls_certificate,
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)
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for key_id, key in verify_keys.items():
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yield self.store.store_server_verify_key(
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server_name, server_name, time_now_ms, key
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x509_certificate_bytes = crypto.dump_certificate(
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crypto.FILETYPE_ASN1, tls_certificate
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)
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for key_id in key_ids:
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if key_id in verify_keys:
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defer.returnValue(verify_keys[key_id])
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return
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if ("signatures" not in response
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or server_name not in response["signatures"]):
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raise ValueError("Key response not signed by remote server")
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raise ValueError("No verification key found for given key ids")
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if "tls_certificate" not in response:
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raise ValueError("Key response missing TLS certificate")
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tls_certificate_b64 = response["tls_certificate"]
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if encode_base64(x509_certificate_bytes) != tls_certificate_b64:
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raise ValueError("TLS certificate doesn't match")
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verify_keys = {}
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for key_id, key_base64 in response["verify_keys"].items():
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if is_signing_algorithm_supported(key_id):
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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_keys[key_id] = verify_key
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for key_id in response["signatures"][server_name]:
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if key_id not in response["verify_keys"]:
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raise ValueError(
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"Key response must include verification keys for all"
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" signatures"
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)
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if key_id in verify_keys:
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verify_signed_json(
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response,
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server_name,
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verify_keys[key_id]
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)
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# Cache the result in the datastore.
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time_now_ms = self.clock.time_msec()
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yield self.store.store_server_certificate(
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server_name,
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server_name,
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time_now_ms,
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tls_certificate,
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)
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for key_id, key in verify_keys.items():
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yield self.store.store_server_verify_key(
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server_name, server_name, time_now_ms, key
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)
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for key_id in key_ids:
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if key_id in verify_keys:
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defer.returnValue(verify_keys[key_id])
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return
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raise ValueError("No verification key found for given key ids")
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download = self.key_downloads.get(server_name)
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if download is None:
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download = fetch_keys()
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self.key_downloads[server_name] = download
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@download.addBoth
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def callback(ret):
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del self.key_downloads[server_name]
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return ret
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r = yield create_observer(download)
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defer.returnValue(r)
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@ -25,6 +25,8 @@ from twisted.internet import defer
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from twisted.web.resource import Resource
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from twisted.protocols.basic import FileSender
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from synapse.util.async import create_observer
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import os
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import logging
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@ -87,7 +89,7 @@ class BaseMediaResource(Resource):
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def callback(media_info):
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del self.downloads[key]
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return media_info
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return download
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return create_observer(download)
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@defer.inlineCallbacks
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def _get_remote_media_impl(self, server_name, media_id):
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