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Rate limit retries when fetching server keys.

This commit is contained in:
Erik Johnston 2015-02-17 15:57:42 +00:00
parent 1a989c436c
commit 5025305fb2

View file

@ -87,69 +87,85 @@ class Keyring(object):
return
# Try to fetch the key from the remote server.
# TODO(markjh): Ratelimit requests to a given server.
(response, tls_certificate) = yield fetch_server_key(
server_name, self.hs.tls_context_factory
retry_last_ts, retry_interval = (0, 0)
retry_timings = yield self.store.get_destination_retry_timings(
server_name
)
if retry_timings:
retry_last_ts, retry_interval = (
retry_timings.retry_last_ts, retry_timings.retry_interval
)
if retry_last_ts + retry_interval > int(self.clock.time_msec()):
logger.info("%s not ready for retry", server_name)
raise ValueError("No verification key found for given key ids")
# 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]
)
# 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
try:
(response, tls_certificate) = yield fetch_server_key(
server_name, self.hs.tls_context_factory
)
for key_id in key_ids:
if key_id in verify_keys:
defer.returnValue(verify_keys[key_id])
return
# Check the response.
raise ValueError("No verification key found for given key ids")
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]
)
# 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")
except:
self.set_retrying(server_name, retry_interval)
raise