mirror of
https://mau.dev/maunium/synapse.git
synced 2024-10-01 01:36:05 -04:00
Make it the responsibility of the replication layer to check signature and hashes.
This commit is contained in:
Erik Johnston
parent
7b88619241
commit
c92d64a6c3
@ -20,6 +20,13 @@ from .units import Edu
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from synapse.util.logutils import log_function
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from synapse.events import FrozenEvent
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from synapse.events.utils import prune_event
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from syutil.jsonutil import encode_canonical_json
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from synapse.crypto.event_signing import check_event_content_hash
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from synapse.api.errors import SynapseError
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import logging
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@ -126,6 +133,11 @@ class FederationClient(object):
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for p in transaction_data["pdus"]
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]
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for i, pdu in enumerate(pdus):
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pdus[i] = yield self._check_sigs_and_hash(pdu)
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# FIXME: We should handle signature failures more gracefully.
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defer.returnValue(pdus)
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@defer.inlineCallbacks
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@ -159,6 +171,22 @@ class FederationClient(object):
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transaction_data = yield self.transport_layer.get_event(
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destination, event_id
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)
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logger.debug("transaction_data %r", transaction_data)
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pdu_list = [
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self.event_from_pdu_json(p, outlier=outlier)
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for p in transaction_data["pdus"]
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]
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if pdu_list:
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pdu = pdu_list[0]
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# Check signatures are correct.
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pdu = yield self._check_sigs_and_hash(pdu)
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break
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except Exception as e:
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logger.info(
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"Failed to get PDU %s from %s because %s",
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@ -166,18 +194,6 @@ class FederationClient(object):
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)
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continue
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logger.debug("transaction_data %r", transaction_data)
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pdu_list = [
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self.event_from_pdu_json(p, outlier=outlier)
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for p in transaction_data["pdus"]
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]
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if pdu_list:
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pdu = pdu_list[0]
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# TODO: We need to check signatures here
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break
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defer.returnValue(pdu)
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@defer.inlineCallbacks
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@ -208,6 +224,16 @@ class FederationClient(object):
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for p in result.get("auth_chain", [])
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]
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for i, pdu in enumerate(pdus):
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pdus[i] = yield self._check_sigs_and_hash(pdu)
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# FIXME: We should handle signature failures more gracefully.
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for i, pdu in enumerate(auth_chain):
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auth_chain[i] = yield self._check_sigs_and_hash(pdu)
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# FIXME: We should handle signature failures more gracefully.
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defer.returnValue((pdus, auth_chain))
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@defer.inlineCallbacks
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@ -222,6 +248,11 @@ class FederationClient(object):
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for p in res["auth_chain"]
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]
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for i, pdu in enumerate(auth_chain):
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auth_chain[i] = yield self._check_sigs_and_hash(pdu)
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# FIXME: We should handle signature failures more gracefully.
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auth_chain.sort(key=lambda e: e.depth)
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defer.returnValue(auth_chain)
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@ -260,6 +291,16 @@ class FederationClient(object):
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for p in content.get("auth_chain", [])
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]
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for i, pdu in enumerate(state):
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state[i] = yield self._check_sigs_and_hash(pdu)
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# FIXME: We should handle signature failures more gracefully.
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for i, pdu in enumerate(auth_chain):
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auth_chain[i] = yield self._check_sigs_and_hash(pdu)
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# FIXME: We should handle signature failures more gracefully.
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auth_chain.sort(key=lambda e: e.depth)
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defer.returnValue({
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@ -281,7 +322,14 @@ class FederationClient(object):
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logger.debug("Got response to send_invite: %s", pdu_dict)
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defer.returnValue(self.event_from_pdu_json(pdu_dict))
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pdu = self.event_from_pdu_json(pdu_dict)
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# Check signatures are correct.
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pdu = yield self._check_sigs_and_hash(pdu)
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# FIXME: We should handle signature failures more gracefully.
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defer.returnValue(pdu)
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def event_from_pdu_json(self, pdu_json, outlier=False):
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event = FrozenEvent(
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@ -291,3 +339,37 @@ class FederationClient(object):
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event.internal_metadata.outlier = outlier
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return event
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@defer.inlineCallbacks
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def _check_sigs_and_hash(self, pdu):
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"""Throws a SynapseError if the PDU does not have the correct
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signatures.
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Returns:
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FrozenEvent: Either the given event or it redacted if it failed the
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content hash check.
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"""
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# Check signatures are correct.
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redacted_event = prune_event(pdu)
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redacted_pdu_json = redacted_event.get_pdu_json()
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try:
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yield self.keyring.verify_json_for_server(
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pdu.origin, redacted_pdu_json
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)
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except SynapseError:
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logger.warn(
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"Signature check failed for %s redacted to %s",
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encode_canonical_json(pdu.get_pdu_json()),
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encode_canonical_json(redacted_pdu_json),
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)
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raise
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if not check_event_content_hash(pdu):
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logger.warn(
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"Event content has been tampered, redacting %s, %s",
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pdu.event_id, encode_canonical_json(pdu.get_dict())
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)
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defer.returnValue(redacted_event)
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defer.returnValue(pdu)
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@ -21,6 +21,13 @@ from .units import Transaction, Edu
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from synapse.util.logutils import log_function
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from synapse.util.logcontext import PreserveLoggingContext
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from synapse.events import FrozenEvent
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from synapse.events.utils import prune_event
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from syutil.jsonutil import encode_canonical_json
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from synapse.crypto.event_signing import check_event_content_hash
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from synapse.api.errors import FederationError, SynapseError
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import logging
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@ -97,8 +104,10 @@ class FederationServer(object):
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response = yield self.transaction_actions.have_responded(transaction)
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if response:
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logger.debug("[%s] We've already responed to this request",
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transaction.transaction_id)
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logger.debug(
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"[%s] We've already responed to this request",
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transaction.transaction_id
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)
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defer.returnValue(response)
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return
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@ -253,6 +262,9 @@ class FederationServer(object):
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origin, pdu.event_id, do_auth=False
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)
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# FIXME: Currently we fetch an event again when we already have it
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# if it has been marked as an outlier.
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already_seen = (
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existing and (
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not existing.internal_metadata.is_outlier()
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@ -264,14 +276,27 @@ class FederationServer(object):
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defer.returnValue({})
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return
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# Check signature.
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try:
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pdu = yield self._check_sigs_and_hash(pdu)
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except SynapseError as e:
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raise FederationError(
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"ERROR",
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e.code,
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e.msg,
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affected=pdu.event_id,
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)
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state = None
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auth_chain = []
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have_seen = yield self.store.have_events(
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[e for e, _ in pdu.prev_events]
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[ev for ev, _ in pdu.prev_events]
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)
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fetch_state = False
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# Get missing pdus if necessary.
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if not pdu.internal_metadata.is_outlier():
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# We only backfill backwards to the min depth.
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@ -311,16 +336,20 @@ class FederationServer(object):
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except:
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# TODO(erikj): Do some more intelligent retries.
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logger.exception("Failed to get PDU")
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else:
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# We need to get the state at this event, since we have reached
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# a backward extremity edge.
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logger.debug(
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"_handle_new_pdu getting state for %s",
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pdu.room_id
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)
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state, auth_chain = yield self.get_state_for_room(
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origin, pdu.room_id, pdu.event_id,
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)
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fetch_state = True
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else:
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fetch_state = True
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if fetch_state:
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# We need to get the state at this event, since we haven't
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# processed all the prev events.
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logger.debug(
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"_handle_new_pdu getting state for %s",
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pdu.room_id
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)
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state, auth_chain = yield self.get_state_for_room(
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origin, pdu.room_id, pdu.event_id,
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)
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ret = yield self.handler.on_receive_pdu(
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origin,
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@ -343,3 +372,37 @@ class FederationServer(object):
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event.internal_metadata.outlier = outlier
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return event
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@defer.inlineCallbacks
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def _check_sigs_and_hash(self, pdu):
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"""Throws a SynapseError if the PDU does not have the correct
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signatures.
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Returns:
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FrozenEvent: Either the given event or it redacted if it failed the
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content hash check.
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"""
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# Check signatures are correct.
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redacted_event = prune_event(pdu)
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redacted_pdu_json = redacted_event.get_pdu_json()
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try:
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yield self.keyring.verify_json_for_server(
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pdu.origin, redacted_pdu_json
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)
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except SynapseError:
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logger.warn(
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"Signature check failed for %s redacted to %s",
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encode_canonical_json(pdu.get_pdu_json()),
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encode_canonical_json(redacted_pdu_json),
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)
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raise
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if not check_event_content_hash(pdu):
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logger.warn(
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"Event content has been tampered, redacting %s, %s",
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pdu.event_id, encode_canonical_json(pdu.get_dict())
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)
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defer.returnValue(redacted_event)
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defer.returnValue(pdu)
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@ -51,6 +51,8 @@ class ReplicationLayer(FederationClient, FederationServer):
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def __init__(self, hs, transport_layer):
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self.server_name = hs.hostname
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self.keyring = hs.get_keyring()
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self.transport_layer = transport_layer
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self.transport_layer.register_received_handler(self)
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self.transport_layer.register_request_handler(self)
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