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Stop overwriting server keys with other keys

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Fix a bug where we would discard a key result which the origin server is no
longer returning. Fixes #5305.
This commit is contained in:
Richard van der Hoff 2019-05-31 15:48:36 +01:00
parent fe79b5e521
commit 3600f5568b
2 changed files with 3 additions and 12 deletions
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1
changelog.d/5307.bugfix Normal file
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@ -0,0 +1 @@
Fix bug where a notary server would sometimes forget old keys.

14
synapse/crypto/keyring.py
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@ -394,7 +394,7 @@ class BaseV2KeyFetcher(object):
@defer.inlineCallbacks
def process_v2_response(
self, from_server, response_json, time_added_ms, requested_ids=[]
self, from_server, response_json, time_added_ms
):
"""Parse a 'Server Keys' structure from the result of a /key request
@ -417,10 +417,6 @@ class BaseV2KeyFetcher(object):
time_added_ms (int): the timestamp to record in server_keys_json
requested_ids (iterable[str]): a list of the key IDs that were requested.
We will store the json for these key ids as well as any that are
actually in the response
Returns:
Deferred[dict[str, FetchKeyResult]]: map from key_id to result object
"""
@ -476,11 +472,6 @@ class BaseV2KeyFetcher(object):
signed_key_json_bytes = encode_canonical_json(signed_key_json)
# for reasons I don't quite understand, we store this json for the key ids we
# requested, as well as those we got.
updated_key_ids = set(requested_ids)
updated_key_ids.update(verify_keys)
yield logcontext.make_deferred_yieldable(
defer.gatherResults(
[
@ -493,7 +484,7 @@ class BaseV2KeyFetcher(object):
ts_expires_ms=ts_valid_until_ms,
key_json_bytes=signed_key_json_bytes,
)
for key_id in updated_key_ids
for key_id in verify_keys
],
consumeErrors=True,
).addErrback(unwrapFirstError)
@ -749,7 +740,6 @@ class ServerKeyFetcher(BaseV2KeyFetcher):
response_keys = yield self.process_v2_response(
from_server=server_name,
requested_ids=[requested_key_id],
response_json=response,
time_added_ms=time_now_ms,
)