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Merge pull request #5100 from matrix-org/rav/verification_hackery

Improve logging when event-signature checking fails
This commit is contained in:
Richard van der Hoff 2019-04-29 13:19:32 +01:00 committed by GitHub
commit b31cc1c613
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 55 additions and 18 deletions

1
changelog.d/5100.misc Normal file
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@ -0,0 +1 @@
Improve logging when event-signature checks fail.

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@ -114,40 +114,54 @@ class Keyring(object):
server_name. The deferreds run their callbacks in the sentinel
logcontext.
"""
# a list of VerifyKeyRequests
verify_requests = []
handle = preserve_fn(_handle_key_deferred)
for server_name, json_object in server_and_json:
def process(server_name, json_object):
"""Process an entry in the request list
Given a (server_name, json_object) pair from the request list,
adds a key request to verify_requests, and returns a deferred which will
complete or fail (in the sentinel context) when verification completes.
"""
key_ids = signature_ids(json_object, server_name)
if not key_ids:
logger.warn("Request from %s: no supported signature keys",
server_name)
deferred = defer.fail(SynapseError(
400,
"Not signed with a supported algorithm",
Codes.UNAUTHORIZED,
))
else:
deferred = defer.Deferred()
return defer.fail(
SynapseError(
400,
"Not signed by %s" % (server_name,),
Codes.UNAUTHORIZED,
)
)
logger.debug("Verifying for %s with key_ids %s",
server_name, key_ids)
# add the key request to the queue, but don't start it off yet.
verify_request = VerifyKeyRequest(
server_name, key_ids, json_object, deferred
server_name, key_ids, json_object, defer.Deferred(),
)
verify_requests.append(verify_request)
run_in_background(self._start_key_lookups, verify_requests)
# now run _handle_key_deferred, which will wait for the key request
# to complete and then do the verification.
#
# We want _handle_key_request to log to the right context, so we
# wrap it with preserve_fn (aka run_in_background)
return handle(verify_request)
# Pass those keys to handle_key_deferred so that the json object
# signatures can be verified
handle = preserve_fn(_handle_key_deferred)
return [
handle(rq) for rq in verify_requests
results = [
process(server_name, json_object)
for server_name, json_object in server_and_json
]
if verify_requests:
run_in_background(self._start_key_lookups, verify_requests)
return results
@defer.inlineCallbacks
def _start_key_lookups(self, verify_requests):
"""Sets off the key fetches for each verify request

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@ -269,7 +269,18 @@ def _check_sigs_on_pdus(keyring, room_version, pdus):
for p in pdus_to_check_sender
])
def sender_err(e, pdu_to_check):
errmsg = "event id %s: unable to verify signature for sender %s: %s" % (
pdu_to_check.pdu.event_id,
pdu_to_check.sender_domain,
e.getErrorMessage(),
)
# XX not really sure if these are the right codes, but they are what
# we've done for ages
raise SynapseError(400, errmsg, Codes.UNAUTHORIZED)
for p, d in zip(pdus_to_check_sender, more_deferreds):
d.addErrback(sender_err, p)
p.deferreds.append(d)
# now let's look for events where the sender's domain is different to the
@ -291,7 +302,18 @@ def _check_sigs_on_pdus(keyring, room_version, pdus):
for p in pdus_to_check_event_id
])
def event_err(e, pdu_to_check):
errmsg = (
"event id %s: unable to verify signature for event id domain: %s" % (
pdu_to_check.pdu.event_id,
e.getErrorMessage(),
)
)
# XX as above: not really sure if these are the right codes
raise SynapseError(400, errmsg, Codes.UNAUTHORIZED)
for p, d in zip(pdus_to_check_event_id, more_deferreds):
d.addErrback(event_err, p)
p.deferreds.append(d)
# replace lists of deferreds with single Deferreds