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Merge pull request #2719 from matrix-org/rav/handle_missing_hashes

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Fix 500 when joining matrix-dev
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Richard van der Hoff 2017-11-29 16:01:33 +00:00 committed by GitHub
commit 8b45de90a4
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1 changed files with 10 additions and 3 deletions
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13
synapse/crypto/event_signing.py
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@ -32,15 +32,22 @@ def check_event_content_hash(event, hash_algorithm=hashlib.sha256):
"""Check whether the hash for this PDU matches the contents"""
name, expected_hash = compute_content_hash(event, hash_algorithm)
logger.debug("Expecting hash: %s", encode_base64(expected_hash))
if name not in event.hashes:
# some malformed events lack a 'hashes'. Protect against it being missing
# or a weird type by basically treating it the same as an unhashed event.
hashes = event.get("hashes")
if not isinstance(hashes, dict):
raise SynapseError(400, "Malformed 'hashes'", Codes.UNAUTHORIZED)
if name not in hashes:
raise SynapseError(
400,
"Algorithm %s not in hashes %s" % (
name, list(event.hashes),
name, list(hashes),
),
Codes.UNAUTHORIZED,
)
message_hash_base64 = event.hashes[name]
message_hash_base64 = hashes[name]
try:
message_hash_bytes = decode_base64(message_hash_base64)
except Exception: