diff options
| -rw-r--r-- | synapse/crypto/keyring.py | 153 |
1 files changed, 77 insertions, 76 deletions
diff --git a/synapse/crypto/keyring.py b/synapse/crypto/keyring.py index d98341f5c2..14f8f536e4 100644 --- a/synapse/crypto/keyring.py +++ b/synapse/crypto/keyring.py @@ -101,92 +101,93 @@ class Keyring(object): defer.returnValue(cached[0]) return - @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, - ) + download = self.key_downloads.get(server_name) - with limiter: - (response, tls_certificate) = yield fetch_server_key( - server_name, self.hs.tls_context_factory - ) + if download is None: + download = self._get_server_verify_key_impl(server_name, key_ids) + 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) - # Check the response. - x509_certificate_bytes = crypto.dump_certificate( - crypto.FILETYPE_ASN1, tls_certificate + @defer.inlineCallbacks + def _get_server_verify_key_impl(self, server_name, key_ids): + # 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 ) - 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] - ) - - # 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, - ) + # Check the response. + + x509_certificate_bytes = crypto.dump_certificate( + crypto.FILETYPE_ASN1, 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 + 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] ) - for key_id in key_ids: - if key_id in verify_keys: - defer.returnValue(verify_keys[key_id]) - return + # Cache the result in the datastore. - raise ValueError("No verification key found for given key ids") + time_now_ms = self.clock.time_msec() - download = self.key_downloads.get(server_name) + yield self.store.store_server_certificate( + server_name, + server_name, + time_now_ms, + tls_certificate, + ) - if download is None: - download = fetch_keys() - self.key_downloads[server_name] = download + for key_id, key in verify_keys.items(): + yield self.store.store_server_verify_key( + server_name, server_name, time_now_ms, key + ) - @download.addBoth - def callback(ret): - del self.key_downloads[server_name] - return ret + for key_id in key_ids: + if key_id in verify_keys: + defer.returnValue(verify_keys[key_id]) + return - r = yield create_observer(download) - defer.returnValue(r) + raise ValueError("No verification key found for given key ids") \ No newline at end of file |