Rate limit retries when fetching server keys.
This commit is contained in:
Erik Johnston
parent
1a989c436c
commit
5025305fb2
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@ -87,69 +87,85 @@ class Keyring(object):
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return
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# Try to fetch the key from the remote server.
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# TODO(markjh): Ratelimit requests to a given server.
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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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retry_last_ts, retry_interval = (0, 0)
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retry_timings = yield self.store.get_destination_retry_timings(
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server_name
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)
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if retry_timings:
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retry_last_ts, retry_interval = (
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retry_timings.retry_last_ts, retry_timings.retry_interval
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)
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if retry_last_ts + retry_interval > int(self.clock.time_msec()):
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logger.info("%s not ready for retry", server_name)
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raise ValueError("No verification key found for given key ids")
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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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)
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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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try:
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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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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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# Check the response.
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raise ValueError("No verification key found for given key ids")
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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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)
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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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except:
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self.set_retrying(server_name, retry_interval)
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raise
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