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Try to log more helpful info when a sig verification fails

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Firstly, don't swallow the reason for the failure

Secondly, don't assume all exceptions are verification failures

Thirdly, log a bit of info about the key being used if debug is enabled
This commit is contained in:
Richard van der Hoff 2018-06-08 12:01:36 +01:00
parent 13d211edc1
commit e82db24a0e
1 changed files with 25 additions and 6 deletions
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31
synapse/crypto/keyring.py
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@ -27,10 +27,12 @@ from synapse.util.metrics import Measure
from twisted.internet import defer
from signedjson.sign import (
verify_signed_json, signature_ids, sign_json, encode_canonical_json
verify_signed_json, signature_ids, sign_json, encode_canonical_json,
SignatureVerifyException,
)
from signedjson.key import (
is_signing_algorithm_supported, decode_verify_key_bytes
is_signing_algorithm_supported, decode_verify_key_bytes,
encode_verify_key_base64,
)
from unpaddedbase64 import decode_base64, encode_base64
@ -56,7 +58,7 @@ Attributes:
key_ids(set(str)): The set of key_ids to that could be used to verify the
JSON object
json_object(dict): The JSON object to verify.
deferred(twisted.internet.defer.Deferred):
deferred(Deferred[str, str, nacl.signing.VerifyKey]):
A deferred (server_name, key_id, verify_key) tuple that resolves when
a verify key has been fetched. The deferreds' callbacks are run with no
logcontext.
@ -736,6 +738,17 @@ class Keyring(object):
@defer.inlineCallbacks
def _handle_key_deferred(verify_request):
"""Waits for the key to become available, and then performs a verification
Args:
verify_request (VerifyKeyRequest):
Returns:
Deferred[None]
Raises:
SynapseError if there was a problem performing the verification
"""
server_name = verify_request.server_name
try:
with PreserveLoggingContext():
@ -768,11 +781,17 @@ def _handle_key_deferred(verify_request):
))
try:
verify_signed_json(json_object, server_name, verify_key)
except Exception:
except SignatureVerifyException as e:
logger.debug(
"Error verifying signature for %s:%s:%s with key %s: %s",
server_name, verify_key.alg, verify_key.version,
encode_verify_key_base64(verify_key),
str(e),
)
raise SynapseError(
401,
"Invalid signature for server %s with key %s:%s" % (
server_name, verify_key.alg, verify_key.version
"Invalid signature for server %s with key %s:%s: %s" % (
server_name, verify_key.alg, verify_key.version, str(e),
),
Codes.UNAUTHORIZED,
)