mirror of
https://mau.dev/maunium/synapse.git
synced 2024-07-07 19:52:23 +00:00
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
|
|||
|
||||
from synapse.util.logutils import log_function
|
||||
from synapse.events import FrozenEvent
|
||||
from synapse.events.utils import prune_event
|
||||
|
||||
from syutil.jsonutil import encode_canonical_json
|
||||
|
||||
from synapse.crypto.event_signing import check_event_content_hash
|
||||
|
||||
from synapse.api.errors import SynapseError
|
||||
|
||||
import logging
|
||||
|
||||
|
|
@ -126,6 +133,11 @@ class FederationClient(object):
|
|||
for p in transaction_data["pdus"]
|
||||
]
|
||||
|
||||
for i, pdu in enumerate(pdus):
|
||||
pdus[i] = yield self._check_sigs_and_hash(pdu)
|
||||
|
||||
# FIXME: We should handle signature failures more gracefully.
|
||||
|
||||
defer.returnValue(pdus)
|
||||
|
||||
@defer.inlineCallbacks
|
||||
|
|
@ -159,6 +171,22 @@ class FederationClient(object):
|
|||
transaction_data = yield self.transport_layer.get_event(
|
||||
destination, event_id
|
||||
)
|
||||
|
||||
logger.debug("transaction_data %r", transaction_data)
|
||||
|
||||
pdu_list = [
|
||||
self.event_from_pdu_json(p, outlier=outlier)
|
||||
for p in transaction_data["pdus"]
|
||||
]
|
||||
|
||||
if pdu_list:
|
||||
pdu = pdu_list[0]
|
||||
|
||||
# Check signatures are correct.
|
||||
pdu = yield self._check_sigs_and_hash(pdu)
|
||||
|
||||
break
|
||||
|
||||
except Exception as e:
|
||||
logger.info(
|
||||
"Failed to get PDU %s from %s because %s",
|
||||
|
|
@ -166,18 +194,6 @@ class FederationClient(object):
|
|||
)
|
||||
continue
|
||||
|
||||
logger.debug("transaction_data %r", transaction_data)
|
||||
|
||||
pdu_list = [
|
||||
self.event_from_pdu_json(p, outlier=outlier)
|
||||
for p in transaction_data["pdus"]
|
||||
]
|
||||
|
||||
if pdu_list:
|
||||
pdu = pdu_list[0]
|
||||
# TODO: We need to check signatures here
|
||||
break
|
||||
|
||||
defer.returnValue(pdu)
|
||||
|
||||
@defer.inlineCallbacks
|
||||
|
|
@ -208,6 +224,16 @@ class FederationClient(object):
|
|||
for p in result.get("auth_chain", [])
|
||||
]
|
||||
|
||||
for i, pdu in enumerate(pdus):
|
||||
pdus[i] = yield self._check_sigs_and_hash(pdu)
|
||||
|
||||
# FIXME: We should handle signature failures more gracefully.
|
||||
|
||||
for i, pdu in enumerate(auth_chain):
|
||||
auth_chain[i] = yield self._check_sigs_and_hash(pdu)
|
||||
|
||||
# FIXME: We should handle signature failures more gracefully.
|
||||
|
||||
defer.returnValue((pdus, auth_chain))
|
||||
|
||||
@defer.inlineCallbacks
|
||||
|
|
@ -222,6 +248,11 @@ class FederationClient(object):
|
|||
for p in res["auth_chain"]
|
||||
]
|
||||
|
||||
for i, pdu in enumerate(auth_chain):
|
||||
auth_chain[i] = yield self._check_sigs_and_hash(pdu)
|
||||
|
||||
# FIXME: We should handle signature failures more gracefully.
|
||||
|
||||
auth_chain.sort(key=lambda e: e.depth)
|
||||
|
||||
defer.returnValue(auth_chain)
|
||||
|
|
@ -260,6 +291,16 @@ class FederationClient(object):
|
|||
for p in content.get("auth_chain", [])
|
||||
]
|
||||
|
||||
for i, pdu in enumerate(state):
|
||||
state[i] = yield self._check_sigs_and_hash(pdu)
|
||||
|
||||
# FIXME: We should handle signature failures more gracefully.
|
||||
|
||||
for i, pdu in enumerate(auth_chain):
|
||||
auth_chain[i] = yield self._check_sigs_and_hash(pdu)
|
||||
|
||||
# FIXME: We should handle signature failures more gracefully.
|
||||
|
||||
auth_chain.sort(key=lambda e: e.depth)
|
||||
|
||||
defer.returnValue({
|
||||
|
|
@ -281,7 +322,14 @@ class FederationClient(object):
|
|||
|
||||
logger.debug("Got response to send_invite: %s", pdu_dict)
|
||||
|
||||
defer.returnValue(self.event_from_pdu_json(pdu_dict))
|
||||
pdu = self.event_from_pdu_json(pdu_dict)
|
||||
|
||||
# Check signatures are correct.
|
||||
pdu = yield self._check_sigs_and_hash(pdu)
|
||||
|
||||
# FIXME: We should handle signature failures more gracefully.
|
||||
|
||||
defer.returnValue(pdu)
|
||||
|
||||
def event_from_pdu_json(self, pdu_json, outlier=False):
|
||||
event = FrozenEvent(
|
||||
|
|
@ -291,3 +339,37 @@ class FederationClient(object):
|
|||
event.internal_metadata.outlier = outlier
|
||||
|
||||
return event
|
||||
|
||||
@defer.inlineCallbacks
|
||||
def _check_sigs_and_hash(self, pdu):
|
||||
"""Throws a SynapseError if the PDU does not have the correct
|
||||
signatures.
|
||||
|
||||
Returns:
|
||||
FrozenEvent: Either the given event or it redacted if it failed the
|
||||
content hash check.
|
||||
"""
|
||||
# Check signatures are correct.
|
||||
redacted_event = prune_event(pdu)
|
||||
redacted_pdu_json = redacted_event.get_pdu_json()
|
||||
|
||||
try:
|
||||
yield self.keyring.verify_json_for_server(
|
||||
pdu.origin, redacted_pdu_json
|
||||
)
|
||||
except SynapseError:
|
||||
logger.warn(
|
||||
"Signature check failed for %s redacted to %s",
|
||||
encode_canonical_json(pdu.get_pdu_json()),
|
||||
encode_canonical_json(redacted_pdu_json),
|
||||
)
|
||||
raise
|
||||
|
||||
if not check_event_content_hash(pdu):
|
||||
logger.warn(
|
||||
"Event content has been tampered, redacting %s, %s",
|
||||
pdu.event_id, encode_canonical_json(pdu.get_dict())
|
||||
)
|
||||
defer.returnValue(redacted_event)
|
||||
|
||||
defer.returnValue(pdu)
|
||||
|
|
|
|||
|
|
@ -21,6 +21,13 @@ from .units import Transaction, Edu
|
|||
from synapse.util.logutils import log_function
|
||||
from synapse.util.logcontext import PreserveLoggingContext
|
||||
from synapse.events import FrozenEvent
|
||||
from synapse.events.utils import prune_event
|
||||
|
||||
from syutil.jsonutil import encode_canonical_json
|
||||
|
||||
from synapse.crypto.event_signing import check_event_content_hash
|
||||
|
||||
from synapse.api.errors import FederationError, SynapseError
|
||||
|
||||
import logging
|
||||
|
||||
|
|
@ -97,8 +104,10 @@ class FederationServer(object):
|
|||
response = yield self.transaction_actions.have_responded(transaction)
|
||||
|
||||
if response:
|
||||
logger.debug("[%s] We've already responed to this request",
|
||||
transaction.transaction_id)
|
||||
logger.debug(
|
||||
"[%s] We've already responed to this request",
|
||||
transaction.transaction_id
|
||||
)
|
||||
defer.returnValue(response)
|
||||
return
|
||||
|
||||
|
|
@ -253,6 +262,9 @@ class FederationServer(object):
|
|||
origin, pdu.event_id, do_auth=False
|
||||
)
|
||||
|
||||
# FIXME: Currently we fetch an event again when we already have it
|
||||
# if it has been marked as an outlier.
|
||||
|
||||
already_seen = (
|
||||
existing and (
|
||||
not existing.internal_metadata.is_outlier()
|
||||
|
|
@ -264,14 +276,27 @@ class FederationServer(object):
|
|||
defer.returnValue({})
|
||||
return
|
||||
|
||||
# Check signature.
|
||||
try:
|
||||
pdu = yield self._check_sigs_and_hash(pdu)
|
||||
except SynapseError as e:
|
||||
raise FederationError(
|
||||
"ERROR",
|
||||
e.code,
|
||||
e.msg,
|
||||
affected=pdu.event_id,
|
||||
)
|
||||
|
||||
state = None
|
||||
|
||||
auth_chain = []
|
||||
|
||||
have_seen = yield self.store.have_events(
|
||||
[e for e, _ in pdu.prev_events]
|
||||
[ev for ev, _ in pdu.prev_events]
|
||||
)
|
||||
|
||||
fetch_state = False
|
||||
|
||||
# Get missing pdus if necessary.
|
||||
if not pdu.internal_metadata.is_outlier():
|
||||
# We only backfill backwards to the min depth.
|
||||
|
|
@ -311,16 +336,20 @@ class FederationServer(object):
|
|||
except:
|
||||
# TODO(erikj): Do some more intelligent retries.
|
||||
logger.exception("Failed to get PDU")
|
||||
else:
|
||||
# We need to get the state at this event, since we have reached
|
||||
# a backward extremity edge.
|
||||
logger.debug(
|
||||
"_handle_new_pdu getting state for %s",
|
||||
pdu.room_id
|
||||
)
|
||||
state, auth_chain = yield self.get_state_for_room(
|
||||
origin, pdu.room_id, pdu.event_id,
|
||||
)
|
||||
fetch_state = True
|
||||
else:
|
||||
fetch_state = True
|
||||
|
||||
if fetch_state:
|
||||
# We need to get the state at this event, since we haven't
|
||||
# processed all the prev events.
|
||||
logger.debug(
|
||||
"_handle_new_pdu getting state for %s",
|
||||
pdu.room_id
|
||||
)
|
||||
state, auth_chain = yield self.get_state_for_room(
|
||||
origin, pdu.room_id, pdu.event_id,
|
||||
)
|
||||
|
||||
ret = yield self.handler.on_receive_pdu(
|
||||
origin,
|
||||
|
|
@ -343,3 +372,37 @@ class FederationServer(object):
|
|||
event.internal_metadata.outlier = outlier
|
||||
|
||||
return event
|
||||
|
||||
@defer.inlineCallbacks
|
||||
def _check_sigs_and_hash(self, pdu):
|
||||
"""Throws a SynapseError if the PDU does not have the correct
|
||||
signatures.
|
||||
|
||||
Returns:
|
||||
FrozenEvent: Either the given event or it redacted if it failed the
|
||||
content hash check.
|
||||
"""
|
||||
# Check signatures are correct.
|
||||
redacted_event = prune_event(pdu)
|
||||
redacted_pdu_json = redacted_event.get_pdu_json()
|
||||
|
||||
try:
|
||||
yield self.keyring.verify_json_for_server(
|
||||
pdu.origin, redacted_pdu_json
|
||||
)
|
||||
except SynapseError:
|
||||
logger.warn(
|
||||
"Signature check failed for %s redacted to %s",
|
||||
encode_canonical_json(pdu.get_pdu_json()),
|
||||
encode_canonical_json(redacted_pdu_json),
|
||||
)
|
||||
raise
|
||||
|
||||
if not check_event_content_hash(pdu):
|
||||
logger.warn(
|
||||
"Event content has been tampered, redacting %s, %s",
|
||||
pdu.event_id, encode_canonical_json(pdu.get_dict())
|
||||
)
|
||||
defer.returnValue(redacted_event)
|
||||
|
||||
defer.returnValue(pdu)
|
||||
|
|
|
|||
|
|
@ -51,6 +51,8 @@ class ReplicationLayer(FederationClient, FederationServer):
|
|||
def __init__(self, hs, transport_layer):
|
||||
self.server_name = hs.hostname
|
||||
|
||||
self.keyring = hs.get_keyring()
|
||||
|
||||
self.transport_layer = transport_layer
|
||||
self.transport_layer.register_received_handler(self)
|
||||
self.transport_layer.register_request_handler(self)
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user