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Synapse 1.7.1 (2019-12-18) 

==========================
 
 This release includes several security fixes as well as a fix to a bug exposed by the security fixes. Administrators are encouraged to upgrade as soon as possible.
 
 Security updates
 ----------------
 
 - Fix a bug which could cause room events to be incorrectly authorized using events from a different room. ([\#6501](https://github.com/matrix-org/synapse/issues/6501), [\#6503](https://github.com/matrix-org/synapse/issues/6503), [\#6521](https://github.com/matrix-org/synapse/issues/6521), [\#6524](https://github.com/matrix-org/synapse/issues/6524), [\#6530](https://github.com/matrix-org/synapse/issues/6530), [\#6531](https://github.com/matrix-org/synapse/issues/6531))
 - Fix a bug causing responses to the `/context` client endpoint to not use the pruned version of the event. ([\#6553](https://github.com/matrix-org/synapse/issues/6553))
 - Fix a cause of state resets in room versions 2 onwards. ([\#6556](https://github.com/matrix-org/synapse/issues/6556), [\#6560](https://github.com/matrix-org/synapse/issues/6560))
 
 Bugfixes
 --------
 
 - Fix a bug which could cause the federation server to incorrectly return errors when handling certain obscure event graphs. ([\#6526](https://github.com/matrix-org/synapse/issues/6526), [\#6527](https://github.com/matrix-org/synapse/issues/6527))
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Merge tag 'v1.7.1'

Synapse 1.7.1 (2019-12-18)
==========================

This release includes several security fixes as well as a fix to a bug exposed by the security fixes. Administrators are encouraged to upgrade as soon as possible.

Security updates
----------------

- Fix a bug which could cause room events to be incorrectly authorized using events from a different room. ([\#6501](https://github.com/matrix-org/synapse/issues/6501), [\#6503](https://github.com/matrix-org/synapse/issues/6503), [\#6521](https://github.com/matrix-org/synapse/issues/6521), [\#6524](https://github.com/matrix-org/synapse/issues/6524), [\#6530](https://github.com/matrix-org/synapse/issues/6530), [\#6531](https://github.com/matrix-org/synapse/issues/6531))
- Fix a bug causing responses to the `/context` client endpoint to not use the pruned version of the event. ([\#6553](https://github.com/matrix-org/synapse/issues/6553))
- Fix a cause of state resets in room versions 2 onwards. ([\#6556](https://github.com/matrix-org/synapse/issues/6556), [\#6560](https://github.com/matrix-org/synapse/issues/6560))

Bugfixes
--------

- Fix a bug which could cause the federation server to incorrectly return errors when handling certain obscure event graphs. ([\#6526](https://github.com/matrix-org/synapse/issues/6526), [\#6527](https://github.com/matrix-org/synapse/issues/6527))
This commit is contained in:
Richard van der Hoff 2019-12-18 10:14:49 +00:00
parent bee1982d17 e156c86a7f
commit 4154637834
15 changed files with 551 additions and 377 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
CHANGES.md
View File

@ -1,3 +1,20 @@
Synapse 1.7.1 (2019-12-18)
==========================
This release includes several security fixes as well as a fix to a bug exposed by the security fixes. Administrators are encouraged to upgrade as soon as possible.
Security updates
----------------
- Fix a bug which could cause room events to be incorrectly authorized using events from a different room. ([\#6501](https://github.com/matrix-org/synapse/issues/6501), [\#6503](https://github.com/matrix-org/synapse/issues/6503), [\#6521](https://github.com/matrix-org/synapse/issues/6521), [\#6524](https://github.com/matrix-org/synapse/issues/6524), [\#6530](https://github.com/matrix-org/synapse/issues/6530), [\#6531](https://github.com/matrix-org/synapse/issues/6531))
- Fix a bug causing responses to the `/context` client endpoint to not use the pruned version of the event. ([\#6553](https://github.com/matrix-org/synapse/issues/6553))
- Fix a cause of state resets in room versions 2 onwards. ([\#6556](https://github.com/matrix-org/synapse/issues/6556), [\#6560](https://github.com/matrix-org/synapse/issues/6560))
Bugfixes
--------
- Fix a bug which could cause the federation server to incorrectly return errors when handling certain obscure event graphs. ([\#6526](https://github.com/matrix-org/synapse/issues/6526), [\#6527](https://github.com/matrix-org/synapse/issues/6527))
Synapse 1.7.0 (2019-12-13) Synapse 1.7.0 (2019-12-13)
========================== ==========================
@ -88,7 +105,7 @@ Internal Changes
- Add a test scenario to make sure room history purges don't break `/messages` in the future. ([\#6392](https://github.com/matrix-org/synapse/issues/6392)) - Add a test scenario to make sure room history purges don't break `/messages` in the future. ([\#6392](https://github.com/matrix-org/synapse/issues/6392))
- Clarifications for the email configuration settings. ([\#6423](https://github.com/matrix-org/synapse/issues/6423)) - Clarifications for the email configuration settings. ([\#6423](https://github.com/matrix-org/synapse/issues/6423))
- Add more tests to the blacklist when running in worker mode. ([\#6429](https://github.com/matrix-org/synapse/issues/6429)) - Add more tests to the blacklist when running in worker mode. ([\#6429](https://github.com/matrix-org/synapse/issues/6429))
- Refactor data store layer to support multiple databases in the future. ([\#6454](https://github.com/matrix-org/synapse/issues/6454), [\#6464](https://github.com/matrix-org/synapse/issues/6464), [\#6469](https://github.com/matrix-org/synapse/issues/6469), [\#6487](https://github.com/matrix-org/synapse/issues/6487)) - Refactor data store layer to support multiple databases in the future. ([\#6454](https://github.com/matrix-org/synapse/issues/6454), [\#6464](https://github.com/matrix-org/synapse/issues/6464), [\#6469](https://github.com/matrix-org/synapse/issues/6469), [\#6487](https://github.com/matrix-org/synapse/issues/6487))
- Port synapse.rest.client.v1 to async/await. ([\#6482](https://github.com/matrix-org/synapse/issues/6482)) - Port synapse.rest.client.v1 to async/await. ([\#6482](https://github.com/matrix-org/synapse/issues/6482))
- Port synapse.rest.client.v2_alpha to async/await. ([\#6483](https://github.com/matrix-org/synapse/issues/6483)) - Port synapse.rest.client.v2_alpha to async/await. ([\#6483](https://github.com/matrix-org/synapse/issues/6483))
- Port SyncHandler to async/await. ([\#6484](https://github.com/matrix-org/synapse/issues/6484)) - Port SyncHandler to async/await. ([\#6484](https://github.com/matrix-org/synapse/issues/6484))

6
debian/changelog vendored
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@ -1,3 +1,9 @@
matrix-synapse-py3 (1.7.1) stable; urgency=medium
* New synapse release 1.7.1.
-- Synapse Packaging team <packages@matrix.org> Wed, 18 Dec 2019 09:37:59 +0000
matrix-synapse-py3 (1.7.0) stable; urgency=medium matrix-synapse-py3 (1.7.0) stable; urgency=medium
* New synapse release 1.7.0. * New synapse release 1.7.0.

2
synapse/__init__.py
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@ -36,7 +36,7 @@ try:
except ImportError: except ImportError:
pass pass
__version__ = "1.7.0" __version__ = "1.7.1"
if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)): if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
# We import here so that we don't have to install a bunch of deps when # We import here so that we don't have to install a bunch of deps when

103
synapse/api/auth.py
View File

@ -14,6 +14,7 @@
# limitations under the License. # limitations under the License.
import logging import logging
from typing import Dict, Tuple
from six import itervalues from six import itervalues
@ -25,13 +26,7 @@ from twisted.internet import defer
import synapse.logging.opentracing as opentracing import synapse.logging.opentracing as opentracing
import synapse.types import synapse.types
from synapse import event_auth from synapse import event_auth
from synapse.api.constants import ( from synapse.api.constants import EventTypes, LimitBlockingTypes, Membership, UserTypes
EventTypes,
JoinRules,
LimitBlockingTypes,
Membership,
UserTypes,
)
from synapse.api.errors import ( from synapse.api.errors import (
AuthError, AuthError,
Codes, Codes,
@ -513,71 +508,43 @@ class Auth(object):
""" """
return self.store.is_server_admin(user) return self.store.is_server_admin(user)
@defer.inlineCallbacks def compute_auth_events(
def compute_auth_events(self, event, current_state_ids, for_verification=False): self,
event,
current_state_ids: Dict[Tuple[str, str], str],
for_verification: bool = False,
):
"""Given an event and current state return the list of event IDs used
to auth an event.
If `for_verification` is False then only return auth events that
should be added to the event's `auth_events`.
Returns:
defer.Deferred(list[str]): List of event IDs.
"""
if event.type == EventTypes.Create: if event.type == EventTypes.Create:
return [] return defer.succeed([])
# Currently we ignore the `for_verification` flag even though there are
# some situations where we can drop particular auth events when adding
# to the event's `auth_events` (e.g. joins pointing to previous joins
# when room is publically joinable). Dropping event IDs has the
# advantage that the auth chain for the room grows slower, but we use
# the auth chain in state resolution v2 to order events, which means
# care must be taken if dropping events to ensure that it doesn't
# introduce undesirable "state reset" behaviour.
#
# All of which sounds a bit tricky so we don't bother for now.
auth_ids = [] auth_ids = []
for etype, state_key in event_auth.auth_types_for_event(event):
auth_ev_id = current_state_ids.get((etype, state_key))
if auth_ev_id:
auth_ids.append(auth_ev_id)
key = (EventTypes.PowerLevels, "") return defer.succeed(auth_ids)
power_level_event_id = current_state_ids.get(key)
if power_level_event_id:
auth_ids.append(power_level_event_id)
key = (EventTypes.JoinRules, "")
join_rule_event_id = current_state_ids.get(key)
key = (EventTypes.Member, event.sender)
member_event_id = current_state_ids.get(key)
key = (EventTypes.Create, "")
create_event_id = current_state_ids.get(key)
if create_event_id:
auth_ids.append(create_event_id)
if join_rule_event_id:
join_rule_event = yield self.store.get_event(join_rule_event_id)
join_rule = join_rule_event.content.get("join_rule")
is_public = join_rule == JoinRules.PUBLIC if join_rule else False
else:
is_public = False
if event.type == EventTypes.Member:
e_type = event.content["membership"]
if e_type in [Membership.JOIN, Membership.INVITE]:
if join_rule_event_id:
auth_ids.append(join_rule_event_id)
if e_type == Membership.JOIN:
if member_event_id and not is_public:
auth_ids.append(member_event_id)
else:
if member_event_id:
auth_ids.append(member_event_id)
if for_verification:
key = (EventTypes.Member, event.state_key)
existing_event_id = current_state_ids.get(key)
if existing_event_id:
auth_ids.append(existing_event_id)
if e_type == Membership.INVITE:
if "third_party_invite" in event.content:
key = (
EventTypes.ThirdPartyInvite,
event.content["third_party_invite"]["signed"]["token"],
)
third_party_invite_id = current_state_ids.get(key)
if third_party_invite_id:
auth_ids.append(third_party_invite_id)
elif member_event_id:
member_event = yield self.store.get_event(member_event_id)
if member_event.content["membership"] == Membership.JOIN:
auth_ids.append(member_event.event_id)
return auth_ids
@defer.inlineCallbacks @defer.inlineCallbacks
def check_can_change_room_list(self, room_id, user): def check_can_change_room_list(self, room_id, user):

27
synapse/event_auth.py
View File

@ -14,6 +14,7 @@
# limitations under the License. # limitations under the License.
import logging import logging
from typing import Set, Tuple
from canonicaljson import encode_canonical_json from canonicaljson import encode_canonical_json
from signedjson.key import decode_verify_key_bytes from signedjson.key import decode_verify_key_bytes
@ -48,6 +49,18 @@ def check(room_version, event, auth_events, do_sig_check=True, do_size_check=Tru
if not hasattr(event, "room_id"): if not hasattr(event, "room_id"):
raise AuthError(500, "Event has no room_id: %s" % event) raise AuthError(500, "Event has no room_id: %s" % event)
room_id = event.room_id
# I'm not really expecting to get auth events in the wrong room, but let's
# sanity-check it
for auth_event in auth_events.values():
if auth_event.room_id != room_id:
raise Exception(
"During auth for event %s in room %s, found event %s in the state "
"which is in room %s"
% (event.event_id, room_id, auth_event.event_id, auth_event.room_id)
)
if do_sig_check: if do_sig_check:
sender_domain = get_domain_from_id(event.sender) sender_domain = get_domain_from_id(event.sender)
@ -625,7 +638,7 @@ def get_public_keys(invite_event):
return public_keys return public_keys
def auth_types_for_event(event): def auth_types_for_event(event) -> Set[Tuple[str]]:
"""Given an event, return a list of (EventType, StateKey) that may be """Given an event, return a list of (EventType, StateKey) that may be
needed to auth the event. The returned list may be a superset of what needed to auth the event. The returned list may be a superset of what
would actually be required depending on the full state of the room. would actually be required depending on the full state of the room.
@ -634,20 +647,20 @@ def auth_types_for_event(event):
actually auth the event. actually auth the event.
""" """
if event.type == EventTypes.Create: if event.type == EventTypes.Create:
return [] return set()
auth_types = [ auth_types = {
(EventTypes.PowerLevels, ""), (EventTypes.PowerLevels, ""),
(EventTypes.Member, event.sender), (EventTypes.Member, event.sender),
(EventTypes.Create, ""), (EventTypes.Create, ""),
] }
if event.type == EventTypes.Member: if event.type == EventTypes.Member:
membership = event.content["membership"] membership = event.content["membership"]
if membership in [Membership.JOIN, Membership.INVITE]: if membership in [Membership.JOIN, Membership.INVITE]:
auth_types.append((EventTypes.JoinRules, "")) auth_types.add((EventTypes.JoinRules, ""))
auth_types.append((EventTypes.Member, event.state_key)) auth_types.add((EventTypes.Member, event.state_key))
if membership == Membership.INVITE: if membership == Membership.INVITE:
if "third_party_invite" in event.content: if "third_party_invite" in event.content:
@ -655,6 +668,6 @@ def auth_types_for_event(event):
EventTypes.ThirdPartyInvite, EventTypes.ThirdPartyInvite,
event.content["third_party_invite"]["signed"]["token"], event.content["third_party_invite"]["signed"]["token"],
) )
auth_types.append(key) auth_types.add(key)
return auth_types return auth_types

103
synapse/federation/federation_client.py
View File

@ -18,8 +18,6 @@ import copy
import itertools import itertools
import logging import logging
from six.moves import range
from prometheus_client import Counter from prometheus_client import Counter
from twisted.internet import defer from twisted.internet import defer
@ -39,7 +37,7 @@ from synapse.api.room_versions import (
) )
from synapse.events import builder, room_version_to_event_format from synapse.events import builder, room_version_to_event_format
from synapse.federation.federation_base import FederationBase, event_from_pdu_json from synapse.federation.federation_base import FederationBase, event_from_pdu_json
from synapse.logging.context import make_deferred_yieldable, run_in_background from synapse.logging.context import make_deferred_yieldable
from synapse.logging.utils import log_function from synapse.logging.utils import log_function
from synapse.util import unwrapFirstError from synapse.util import unwrapFirstError
from synapse.util.caches.expiringcache import ExpiringCache from synapse.util.caches.expiringcache import ExpiringCache
@ -310,19 +308,12 @@ class FederationClient(FederationBase):
return signed_pdu return signed_pdu
@defer.inlineCallbacks @defer.inlineCallbacks
@log_function def get_room_state_ids(self, destination: str, room_id: str, event_id: str):
def get_state_for_room(self, destination, room_id, event_id): """Calls the /state_ids endpoint to fetch the state at a particular point
"""Requests all of the room state at a given event from a remote homeserver. in the room, and the auth events for the given event
Args:
destination (str): The remote homeserver to query for the state.
room_id (str): The id of the room we're interested in.
event_id (str): The id of the event we want the state at.
Returns: Returns:
Deferred[Tuple[List[EventBase], List[EventBase]]]: Tuple[List[str], List[str]]: a tuple of (state event_ids, auth event_ids)
A list of events in the state, and a list of events in the auth chain
for the given event.
""" """
result = yield self.transport_layer.get_room_state_ids( result = yield self.transport_layer.get_room_state_ids(
destination, room_id, event_id=event_id destination, room_id, event_id=event_id
@ -331,86 +322,12 @@ class FederationClient(FederationBase):
state_event_ids = result["pdu_ids"] state_event_ids = result["pdu_ids"]
auth_event_ids = result.get("auth_chain_ids", []) auth_event_ids = result.get("auth_chain_ids", [])
fetched_events, failed_to_fetch = yield self.get_events_from_store_or_dest( if not isinstance(state_event_ids, list) or not isinstance(
destination, room_id, set(state_event_ids + auth_event_ids) auth_event_ids, list
) ):
raise Exception("invalid response from /state_ids")
if failed_to_fetch: return state_event_ids, auth_event_ids
logger.warning(
"Failed to fetch missing state/auth events for %s: %s",
room_id,
failed_to_fetch,
)
event_map = {ev.event_id: ev for ev in fetched_events}
pdus = [event_map[e_id] for e_id in state_event_ids if e_id in event_map]
auth_chain = [event_map[e_id] for e_id in auth_event_ids if e_id in event_map]
auth_chain.sort(key=lambda e: e.depth)
return pdus, auth_chain
@defer.inlineCallbacks
def get_events_from_store_or_dest(self, destination, room_id, event_ids):
"""Fetch events from a remote destination, checking if we already have them.
Args:
destination (str)
room_id (str)
event_ids (list)
Returns:
Deferred: A deferred resolving to a 2-tuple where the first is a list of
events and the second is a list of event ids that we failed to fetch.
"""
seen_events = yield self.store.get_events(event_ids, allow_rejected=True)
signed_events = list(seen_events.values())
failed_to_fetch = set()
missing_events = set(event_ids)
for k in seen_events:
missing_events.discard(k)
if not missing_events:
return signed_events, failed_to_fetch
logger.debug(
"Fetching unknown state/auth events %s for room %s",
missing_events,
event_ids,
)
room_version = yield self.store.get_room_version(room_id)
batch_size = 20
missing_events = list(missing_events)
for i in range(0, len(missing_events), batch_size):
batch = set(missing_events[i : i + batch_size])
deferreds = [
run_in_background(
self.get_pdu,
destinations=[destination],
event_id=e_id,
room_version=room_version,
)
for e_id in batch
]
res = yield make_deferred_yieldable(
defer.DeferredList(deferreds, consumeErrors=True)
)
for success, result in res:
if success and result:
signed_events.append(result)
batch.discard(result.event_id)
# We removed all events we successfully fetched from `batch`
failed_to_fetch.update(batch)
return signed_events, failed_to_fetch
@defer.inlineCallbacks @defer.inlineCallbacks
@log_function @log_function

358
synapse/handlers/federation.py
View File

@ -64,8 +64,7 @@ from synapse.replication.http.federation import (
from synapse.replication.http.membership import ReplicationUserJoinedLeftRoomRestServlet from synapse.replication.http.membership import ReplicationUserJoinedLeftRoomRestServlet
from synapse.state import StateResolutionStore, resolve_events_with_store from synapse.state import StateResolutionStore, resolve_events_with_store
from synapse.types import UserID, get_domain_from_id from synapse.types import UserID, get_domain_from_id
from synapse.util import unwrapFirstError from synapse.util.async_helpers import Linearizer, concurrently_execute
from synapse.util.async_helpers import Linearizer
from synapse.util.distributor import user_joined_room from synapse.util.distributor import user_joined_room
from synapse.util.retryutils import NotRetryingDestination from synapse.util.retryutils import NotRetryingDestination
from synapse.visibility import filter_events_for_server from synapse.visibility import filter_events_for_server
@ -240,7 +239,6 @@ class FederationHandler(BaseHandler):
return None return None
state = None state = None
auth_chain = []
# Get missing pdus if necessary. # Get missing pdus if necessary.
if not pdu.internal_metadata.is_outlier(): if not pdu.internal_metadata.is_outlier():
@ -346,7 +344,6 @@ class FederationHandler(BaseHandler):
# Calculate the state after each of the previous events, and # Calculate the state after each of the previous events, and
# resolve them to find the correct state at the current event. # resolve them to find the correct state at the current event.
auth_chains = set()
event_map = {event_id: pdu} event_map = {event_id: pdu}
try: try:
# Get the state of the events we know about # Get the state of the events we know about
@ -370,38 +367,14 @@ class FederationHandler(BaseHandler):
p, p,
) )
room_version = yield self.store.get_room_version(room_id)
with nested_logging_context(p): with nested_logging_context(p):
# note that if any of the missing prevs share missing state or # note that if any of the missing prevs share missing state or
# auth events, the requests to fetch those events are deduped # auth events, the requests to fetch those events are deduped
# by the get_pdu_cache in federation_client. # by the get_pdu_cache in federation_client.
( (remote_state, _,) = yield self._get_state_for_room(
remote_state, origin, room_id, p, include_event_in_state=True
got_auth_chain,
) = yield self.federation_client.get_state_for_room(
origin, room_id, p
) )
# we want the state *after* p; get_state_for_room returns the
# state *before* p.
remote_event = yield self.federation_client.get_pdu(
[origin], p, room_version, outlier=True
)
if remote_event is None:
raise Exception(
"Unable to get missing prev_event %s" % (p,)
)
if remote_event.is_state():
remote_state.append(remote_event)
# XXX hrm I'm not convinced that duplicate events will compare
# for equality, so I'm not sure this does what the author
# hoped.
auth_chains.update(got_auth_chain)
remote_state_map = { remote_state_map = {
(x.type, x.state_key): x.event_id for x in remote_state (x.type, x.state_key): x.event_id for x in remote_state
} }
@ -410,7 +383,9 @@ class FederationHandler(BaseHandler):
for x in remote_state: for x in remote_state:
event_map[x.event_id] = x event_map[x.event_id] = x
room_version = yield self.store.get_room_version(room_id)
state_map = yield resolve_events_with_store( state_map = yield resolve_events_with_store(
room_id,
room_version, room_version,
state_maps, state_maps,
event_map, event_map,
@ -430,7 +405,6 @@ class FederationHandler(BaseHandler):
event_map.update(evs) event_map.update(evs)
state = [event_map[e] for e in six.itervalues(state_map)] state = [event_map[e] for e in six.itervalues(state_map)]
auth_chain = list(auth_chains)
except Exception: except Exception:
logger.warning( logger.warning(
"[%s %s] Error attempting to resolve state at missing " "[%s %s] Error attempting to resolve state at missing "
@ -446,9 +420,7 @@ class FederationHandler(BaseHandler):
affected=event_id, affected=event_id,
) )
yield self._process_received_pdu( yield self._process_received_pdu(origin, pdu, state=state)
origin, pdu, state=state, auth_chain=auth_chain
)
@defer.inlineCallbacks @defer.inlineCallbacks
def _get_missing_events_for_pdu(self, origin, pdu, prevs, min_depth): def _get_missing_events_for_pdu(self, origin, pdu, prevs, min_depth):
@ -584,50 +556,150 @@ class FederationHandler(BaseHandler):
raise raise
@defer.inlineCallbacks @defer.inlineCallbacks
def _process_received_pdu(self, origin, event, state, auth_chain): @log_function
def _get_state_for_room(
self, destination, room_id, event_id, include_event_in_state
):
"""Requests all of the room state at a given event from a remote homeserver.
Args:
destination (str): The remote homeserver to query for the state.
room_id (str): The id of the room we're interested in.
event_id (str): The id of the event we want the state at.
include_event_in_state: if true, the event itself will be included in the
returned state event list.
Returns:
Deferred[Tuple[List[EventBase], List[EventBase]]]:
A list of events in the state, and a list of events in the auth chain
for the given event.
"""
(
state_event_ids,
auth_event_ids,
) = yield self.federation_client.get_room_state_ids(
destination, room_id, event_id=event_id
)
desired_events = set(state_event_ids + auth_event_ids)
if include_event_in_state:
desired_events.add(event_id)
event_map = yield self._get_events_from_store_or_dest(
destination, room_id, desired_events
)
failed_to_fetch = desired_events - event_map.keys()
if failed_to_fetch:
logger.warning(
"Failed to fetch missing state/auth events for %s: %s",
room_id,
failed_to_fetch,
)
remote_state = [
event_map[e_id] for e_id in state_event_ids if e_id in event_map
]
if include_event_in_state:
remote_event = event_map.get(event_id)
if not remote_event:
raise Exception("Unable to get missing prev_event %s" % (event_id,))
if remote_event.is_state() and remote_event.rejected_reason is None:
remote_state.append(remote_event)
auth_chain = [event_map[e_id] for e_id in auth_event_ids if e_id in event_map]
auth_chain.sort(key=lambda e: e.depth)
return remote_state, auth_chain
@defer.inlineCallbacks
def _get_events_from_store_or_dest(self, destination, room_id, event_ids):
"""Fetch events from a remote destination, checking if we already have them.
Args:
destination (str)
room_id (str)
event_ids (Iterable[str])
Persists any events we don't already have as outliers.
If we fail to fetch any of the events, a warning will be logged, and the event
will be omitted from the result. Likewise, any events which turn out not to
be in the given room.
Returns:
Deferred[dict[str, EventBase]]: A deferred resolving to a map
from event_id to event
"""
fetched_events = yield self.store.get_events(event_ids, allow_rejected=True)
missing_events = set(event_ids) - fetched_events.keys()
if missing_events:
logger.debug(
"Fetching unknown state/auth events %s for room %s",
missing_events,
room_id,
)
yield self._get_events_and_persist(
destination=destination, room_id=room_id, events=missing_events
)
# we need to make sure we re-load from the database to get the rejected
# state correct.
fetched_events.update(
(yield self.store.get_events(missing_events, allow_rejected=True))
)
# check for events which were in the wrong room.
#
# this can happen if a remote server claims that the state or
# auth_events at an event in room A are actually events in room B
bad_events = list(
(event_id, event.room_id)
for event_id, event in fetched_events.items()
if event.room_id != room_id
)
for bad_event_id, bad_room_id in bad_events:
# This is a bogus situation, but since we may only discover it a long time
# after it happened, we try our best to carry on, by just omitting the
# bad events from the returned auth/state set.
logger.warning(
"Remote server %s claims event %s in room %s is an auth/state "
"event in room %s",
destination,
bad_event_id,
bad_room_id,
room_id,
)
del fetched_events[bad_event_id]
return fetched_events
@defer.inlineCallbacks
def _process_received_pdu(self, origin, event, state):
""" Called when we have a new pdu. We need to do auth checks and put it """ Called when we have a new pdu. We need to do auth checks and put it
through the StateHandler. through the StateHandler.
Args:
origin: server sending the event
event: event to be persisted
state: Normally None, but if we are handling a gap in the graph
(ie, we are missing one or more prev_events), the resolved state at the
event
""" """
room_id = event.room_id room_id = event.room_id
event_id = event.event_id event_id = event.event_id
logger.debug("[%s %s] Processing event: %s", room_id, event_id, event) logger.debug("[%s %s] Processing event: %s", room_id, event_id, event)
event_ids = set()
if state:
event_ids |= {e.event_id for e in state}
if auth_chain:
event_ids |= {e.event_id for e in auth_chain}
seen_ids = yield self.store.have_seen_events(event_ids)
if state and auth_chain is not None:
# If we have any state or auth_chain given to us by the replication
# layer, then we should handle them (if we haven't before.)
event_infos = []
for e in itertools.chain(auth_chain, state):
if e.event_id in seen_ids:
continue
e.internal_metadata.outlier = True
auth_ids = e.auth_event_ids()
auth = {
(e.type, e.state_key): e
for e in auth_chain
if e.event_id in auth_ids or e.type == EventTypes.Create
}
event_infos.append(_NewEventInfo(event=e, auth_events=auth))
seen_ids.add(e.event_id)
logger.info(
"[%s %s] persisting newly-received auth/state events %s",
room_id,
event_id,
[e.event.event_id for e in event_infos],
)
yield self._handle_new_events(origin, event_infos)
try: try:
context = yield self._handle_new_event(origin, event, state=state) context = yield self._handle_new_event(origin, event, state=state)
except AuthError as e: except AuthError as e:
@ -683,8 +755,6 @@ class FederationHandler(BaseHandler):
if dest == self.server_name: if dest == self.server_name:
raise SynapseError(400, "Can't backfill from self.") raise SynapseError(400, "Can't backfill from self.")
room_version = yield self.store.get_room_version(room_id)
events = yield self.federation_client.backfill( events = yield self.federation_client.backfill(
dest, room_id, limit=limit, extremities=extremities dest, room_id, limit=limit, extremities=extremities
) )
@ -713,6 +783,9 @@ class FederationHandler(BaseHandler):
event_ids = set(e.event_id for e in events) event_ids = set(e.event_id for e in events)
# build a list of events whose prev_events weren't in the batch.
# (XXX: this will include events whose prev_events we already have; that doesn't
# sound right?)
edges = [ev.event_id for ev in events if set(ev.prev_event_ids()) - event_ids] edges = [ev.event_id for ev in events if set(ev.prev_event_ids()) - event_ids]
logger.info("backfill: Got %d events with %d edges", len(events), len(edges)) logger.info("backfill: Got %d events with %d edges", len(events), len(edges))
@ -723,7 +796,7 @@ class FederationHandler(BaseHandler):
state_events = {} state_events = {}
events_to_state = {} events_to_state = {}
for e_id in edges: for e_id in edges:
state, auth = yield self.federation_client.get_state_for_room( state, auth = yield self._get_state_for_room(
destination=dest, room_id=room_id, event_id=e_id destination=dest, room_id=room_id, event_id=e_id
) )
auth_events.update({a.event_id: a for a in auth}) auth_events.update({a.event_id: a for a in auth})
@ -741,95 +814,11 @@ class FederationHandler(BaseHandler):
auth_events.update( auth_events.update(
{e_id: event_map[e_id] for e_id in required_auth if e_id in event_map} {e_id: event_map[e_id] for e_id in required_auth if e_id in event_map}
) )
missing_auth = required_auth - set(auth_events)
failed_to_fetch = set()
# Try and fetch any missing auth events from both DB and remote servers.
# We repeatedly do this until we stop finding new auth events.
while missing_auth - failed_to_fetch:
logger.info("Missing auth for backfill: %r", missing_auth)
ret_events = yield self.store.get_events(missing_auth - failed_to_fetch)
auth_events.update(ret_events)
required_auth.update(
a_id for event in ret_events.values() for a_id in event.auth_event_ids()
)
missing_auth = required_auth - set(auth_events)
if missing_auth - failed_to_fetch:
logger.info(
"Fetching missing auth for backfill: %r",
missing_auth - failed_to_fetch,
)
results = yield make_deferred_yieldable(
defer.gatherResults(
[
run_in_background(
self.federation_client.get_pdu,
[dest],
event_id,
room_version=room_version,
outlier=True,
timeout=10000,
)
for event_id in missing_auth - failed_to_fetch
],
consumeErrors=True,
)
).addErrback(unwrapFirstError)
auth_events.update({a.event_id: a for a in results if a})
required_auth.update(
a_id
for event in results
if event
for a_id in event.auth_event_ids()
)
missing_auth = required_auth - set(auth_events)
failed_to_fetch = missing_auth - set(auth_events)
seen_events = yield self.store.have_seen_events(
set(auth_events.keys()) | set(state_events.keys())
)
# We now have a chunk of events plus associated state and auth chain to
# persist. We do the persistence in two steps:
# 1. Auth events and state get persisted as outliers, plus the
# backward extremities get persisted (as non-outliers).
# 2. The rest of the events in the chunk get persisted one by one, as
# each one depends on the previous event for its state.
#
# The important thing is that events in the chunk get persisted as
# non-outliers, including when those events are also in the state or
# auth chain. Caution must therefore be taken to ensure that they are
# not accidentally marked as outliers.
# Step 1a: persist auth events that *don't* appear in the chunk
ev_infos = [] ev_infos = []
for a in auth_events.values():
# We only want to persist auth events as outliers that we haven't
# seen and aren't about to persist as part of the backfilled chunk.
if a.event_id in seen_events or a.event_id in event_map:
continue
a.internal_metadata.outlier = True # Step 1: persist the events in the chunk we fetched state for (i.e.
ev_infos.append( # the backwards extremities), with custom auth events and state
_NewEventInfo(
event=a,
auth_events={
(
auth_events[a_id].type,
auth_events[a_id].state_key,
): auth_events[a_id]
for a_id in a.auth_event_ids()
if a_id in auth_events
},
)
)
# Step 1b: persist the events in the chunk we fetched state for (i.e.
# the backwards extremities) as non-outliers.
for e_id in events_to_state: for e_id in events_to_state:
# For paranoia we ensure that these events are marked as # For paranoia we ensure that these events are marked as
# non-outliers # non-outliers
@ -1071,6 +1060,57 @@ class FederationHandler(BaseHandler):
return False return False
@defer.inlineCallbacks
def _get_events_and_persist(
self, destination: str, room_id: str, events: Iterable[str]
):
"""Fetch the given events from a server, and persist them as outliers.
Logs a warning if we can't find the given event.
"""
room_version = yield self.store.get_room_version(room_id)
event_infos = []
async def get_event(event_id: str):
with nested_logging_context(event_id):
try:
event = await self.federation_client.get_pdu(
[destination], event_id, room_version, outlier=True,
)
if event is None:
logger.warning(
"Server %s didn't return event %s", destination, event_id,
)
return
# recursively fetch the auth events for this event
auth_events = await self._get_events_from_store_or_dest(
destination, room_id, event.auth_event_ids()
)
auth = {}
for auth_event_id in event.auth_event_ids():
ae = auth_events.get(auth_event_id)
if ae:
auth[(ae.type, ae.state_key)] = ae
event_infos.append(_NewEventInfo(event, None, auth))
except Exception as e:
logger.warning(
"Error fetching missing state/auth event %s: %s %s",
event_id,
type(e),
e,
)
yield concurrently_execute(get_event, events, 5)
yield self._handle_new_events(
destination, event_infos,
)
def _sanity_check_event(self, ev): def _sanity_check_event(self, ev):
""" """
Do some early sanity checks of a received event Do some early sanity checks of a received event

7
synapse/handlers/room.py
View File

@ -907,7 +907,10 @@ class RoomContextHandler(object):
results["events_before"] = yield filter_evts(results["events_before"]) results["events_before"] = yield filter_evts(results["events_before"])
results["events_after"] = yield filter_evts(results["events_after"]) results["events_after"] = yield filter_evts(results["events_after"])
results["event"] = event # filter_evts can return a pruned event in case the user is allowed to see that
# there's something there but not see the content, so use the event that's in
# `filtered` rather than the event we retrieved from the datastore.
results["event"] = filtered[0]
if results["events_after"]: if results["events_after"]:
last_event_id = results["events_after"][-1].event_id last_event_id = results["events_after"][-1].event_id
@ -938,7 +941,7 @@ class RoomContextHandler(object):
if event_filter: if event_filter:
state_events = event_filter.filter(state_events) state_events = event_filter.filter(state_events)
results["state"] = state_events results["state"] = yield filter_evts(state_events)
# We use a dummy token here as we only care about the room portion of # We use a dummy token here as we only care about the room portion of
# the token, which we replace. # the token, which we replace.

32
synapse/state/__init__.py
View File

@ -16,7 +16,7 @@
import logging import logging
from collections import namedtuple from collections import namedtuple
from typing import Iterable, Optional from typing import Dict, Iterable, List, Optional, Tuple
from six import iteritems, itervalues from six import iteritems, itervalues
@ -416,6 +416,7 @@ class StateHandler(object):
with Measure(self.clock, "state._resolve_events"): with Measure(self.clock, "state._resolve_events"):
new_state = yield resolve_events_with_store( new_state = yield resolve_events_with_store(
event.room_id,
room_version, room_version,
state_set_ids, state_set_ids,
event_map=state_map, event_map=state_map,
@ -461,7 +462,7 @@ class StateResolutionHandler(object):
not be called for a single state group not be called for a single state group
Args: Args:
room_id (str): room we are resolving for (used for logging) room_id (str): room we are resolving for (used for logging and sanity checks)
room_version (str): version of the room room_version (str): version of the room
state_groups_ids (dict[int, dict[(str, str), str]]): state_groups_ids (dict[int, dict[(str, str), str]]):
map from state group id to the state in that state group map from state group id to the state in that state group
@ -517,6 +518,7 @@ class StateResolutionHandler(object):
logger.info("Resolving conflicted state for %r", room_id) logger.info("Resolving conflicted state for %r", room_id)
with Measure(self.clock, "state._resolve_events"): with Measure(self.clock, "state._resolve_events"):
new_state = yield resolve_events_with_store( new_state = yield resolve_events_with_store(
room_id,
room_version, room_version,
list(itervalues(state_groups_ids)), list(itervalues(state_groups_ids)),
event_map=event_map, event_map=event_map,
@ -588,36 +590,44 @@ def _make_state_cache_entry(new_state, state_groups_ids):
) )
def resolve_events_with_store(room_version, state_sets, event_map, state_res_store): def resolve_events_with_store(
room_id: str,
room_version: str,
state_sets: List[Dict[Tuple[str, str], str]],
event_map: Optional[Dict[str, EventBase]],
state_res_store: "StateResolutionStore",
):
""" """
Args: Args:
room_version(str): Version of the room room_id: the room we are working in
state_sets(list): List of dicts of (type, state_key) -> event_id, room_version: Version of the room
state_sets: List of dicts of (type, state_key) -> event_id,
which are the different state groups to resolve. which are the different state groups to resolve.
event_map(dict[str,FrozenEvent]|None): event_map:
a dict from event_id to event, for any events that we happen to a dict from event_id to event, for any events that we happen to
have in flight (eg, those currently being persisted). This will be have in flight (eg, those currently being persisted). This will be
used as a starting point fof finding the state we need; any missing used as a starting point fof finding the state we need; any missing
events will be requested via state_map_factory. events will be requested via state_map_factory.
If None, all events will be fetched via state_map_factory. If None, all events will be fetched via state_res_store.
state_res_store (StateResolutionStore) state_res_store: a place to fetch events from
Returns Returns:
Deferred[dict[(str, str), str]]: Deferred[dict[(str, str), str]]:
a map from (type, state_key) to event_id. a map from (type, state_key) to event_id.
""" """
v = KNOWN_ROOM_VERSIONS[room_version] v = KNOWN_ROOM_VERSIONS[room_version]
if v.state_res == StateResolutionVersions.V1: if v.state_res == StateResolutionVersions.V1:
return v1.resolve_events_with_store( return v1.resolve_events_with_store(
state_sets, event_map, state_res_store.get_events room_id, state_sets, event_map, state_res_store.get_events
) )
else: else:
return v2.resolve_events_with_store( return v2.resolve_events_with_store(
room_version, state_sets, event_map, state_res_store room_id, room_version, state_sets, event_map, state_res_store
) )

34
synapse/state/v1.py
View File

@ -15,6 +15,7 @@
import hashlib import hashlib
import logging import logging
from typing import Callable, Dict, List, Optional, Tuple
from six import iteritems, iterkeys, itervalues from six import iteritems, iterkeys, itervalues
@ -24,6 +25,7 @@ from synapse import event_auth
from synapse.api.constants import EventTypes from synapse.api.constants import EventTypes
from synapse.api.errors import AuthError from synapse.api.errors import AuthError
from synapse.api.room_versions import RoomVersions from synapse.api.room_versions import RoomVersions
from synapse.events import EventBase
logger = logging.getLogger(__name__) logger = logging.getLogger(__name__)
@ -32,13 +34,20 @@ POWER_KEY = (EventTypes.PowerLevels, "")
@defer.inlineCallbacks @defer.inlineCallbacks
def resolve_events_with_store(state_sets, event_map, state_map_factory): def resolve_events_with_store(
room_id: str,
state_sets: List[Dict[Tuple[str, str], str]],
event_map: Optional[Dict[str, EventBase]],
state_map_factory: Callable,
):
""" """
Args: Args:
state_sets(list): List of dicts of (type, state_key) -> event_id, room_id: the room we are working in
state_sets: List of dicts of (type, state_key) -> event_id,
which are the different state groups to resolve. which are the different state groups to resolve.
event_map(dict[str,FrozenEvent]|None): event_map:
a dict from event_id to event, for any events that we happen to a dict from event_id to event, for any events that we happen to
have in flight (eg, those currently being persisted). This will be have in flight (eg, those currently being persisted). This will be
used as a starting point fof finding the state we need; any missing used as a starting point fof finding the state we need; any missing
@ -46,11 +55,11 @@ def resolve_events_with_store(state_sets, event_map, state_map_factory):
If None, all events will be fetched via state_map_factory. If None, all events will be fetched via state_map_factory.
state_map_factory(func): will be called state_map_factory: will be called
with a list of event_ids that are needed, and should return with with a list of event_ids that are needed, and should return with
a Deferred of dict of event_id to event. a Deferred of dict of event_id to event.
Returns Returns:
Deferred[dict[(str, str), str]]: Deferred[dict[(str, str), str]]:
a map from (type, state_key) to event_id. a map from (type, state_key) to event_id.
""" """
@ -76,6 +85,14 @@ def resolve_events_with_store(state_sets, event_map, state_map_factory):
if event_map is not None: if event_map is not None:
state_map.update(event_map) state_map.update(event_map)
# everything in the state map should be in the right room
for event in state_map.values():
if event.room_id != room_id:
raise Exception(
"Attempting to state-resolve for room %s with event %s which is in %s"
% (room_id, event.event_id, event.room_id,)
)
# get the ids of the auth events which allow us to authenticate the # get the ids of the auth events which allow us to authenticate the
# conflicted state, picking only from the unconflicting state. # conflicted state, picking only from the unconflicting state.
# #
@ -95,6 +112,13 @@ def resolve_events_with_store(state_sets, event_map, state_map_factory):
) )
state_map_new = yield state_map_factory(new_needed_events) state_map_new = yield state_map_factory(new_needed_events)
for event in state_map_new.values():
if event.room_id != room_id:
raise Exception(
"Attempting to state-resolve for room %s with event %s which is in %s"
% (room_id, event.event_id, event.room_id,)
)
state_map.update(state_map_new) state_map.update(state_map_new)
return _resolve_with_state( return _resolve_with_state(

100
synapse/state/v2.py
View File

@ -16,29 +16,40 @@
import heapq import heapq
import itertools import itertools
import logging import logging
from typing import Dict, List, Optional, Tuple
from six import iteritems, itervalues from six import iteritems, itervalues
from twisted.internet import defer from twisted.internet import defer
import synapse.state
from synapse import event_auth from synapse import event_auth
from synapse.api.constants import EventTypes from synapse.api.constants import EventTypes
from synapse.api.errors import AuthError from synapse.api.errors import AuthError
from synapse.events import EventBase
logger = logging.getLogger(__name__) logger = logging.getLogger(__name__)
@defer.inlineCallbacks @defer.inlineCallbacks
def resolve_events_with_store(room_version, state_sets, event_map, state_res_store): def resolve_events_with_store(
room_id: str,
room_version: str,
state_sets: List[Dict[Tuple[str, str], str]],
event_map: Optional[Dict[str, EventBase]],
state_res_store: "synapse.state.StateResolutionStore",
):
"""Resolves the state using the v2 state resolution algorithm """Resolves the state using the v2 state resolution algorithm
Args: Args:
room_version (str): The room version room_id: the room we are working in
state_sets(list): List of dicts of (type, state_key) -> event_id, room_version: The room version
state_sets: List of dicts of (type, state_key) -> event_id,
which are the different state groups to resolve. which are the different state groups to resolve.
event_map(dict[str,FrozenEvent]|None): event_map:
a dict from event_id to event, for any events that we happen to a dict from event_id to event, for any events that we happen to
have in flight (eg, those currently being persisted). This will be have in flight (eg, those currently being persisted). This will be
used as a starting point fof finding the state we need; any missing used as a starting point fof finding the state we need; any missing
@ -46,9 +57,9 @@ def resolve_events_with_store(room_version, state_sets, event_map, state_res_sto
If None, all events will be fetched via state_res_store. If None, all events will be fetched via state_res_store.
state_res_store (StateResolutionStore) state_res_store:
Returns Returns:
Deferred[dict[(str, str), str]]: Deferred[dict[(str, str), str]]:
a map from (type, state_key) to event_id. a map from (type, state_key) to event_id.
""" """
@ -84,6 +95,14 @@ def resolve_events_with_store(room_version, state_sets, event_map, state_res_sto
) )
event_map.update(events) event_map.update(events)
# everything in the event map should be in the right room
for event in event_map.values():
if event.room_id != room_id:
raise Exception(
"Attempting to state-resolve for room %s with event %s which is in %s"
% (room_id, event.event_id, event.room_id,)
)
full_conflicted_set = set(eid for eid in full_conflicted_set if eid in event_map) full_conflicted_set = set(eid for eid in full_conflicted_set if eid in event_map)
logger.debug("%d full_conflicted_set entries", len(full_conflicted_set)) logger.debug("%d full_conflicted_set entries", len(full_conflicted_set))
@ -94,13 +113,14 @@ def resolve_events_with_store(room_version, state_sets, event_map, state_res_sto
) )
sorted_power_events = yield _reverse_topological_power_sort( sorted_power_events = yield _reverse_topological_power_sort(
power_events, event_map, state_res_store, full_conflicted_set room_id, power_events, event_map, state_res_store, full_conflicted_set
) )
logger.debug("sorted %d power events", len(sorted_power_events)) logger.debug("sorted %d power events", len(sorted_power_events))
# Now sequentially auth each one # Now sequentially auth each one
resolved_state = yield _iterative_auth_checks( resolved_state = yield _iterative_auth_checks(
room_id,
room_version, room_version,
sorted_power_events, sorted_power_events,
unconflicted_state, unconflicted_state,
@ -121,13 +141,18 @@ def resolve_events_with_store(room_version, state_sets, event_map, state_res_sto
pl = resolved_state.get((EventTypes.PowerLevels, ""), None) pl = resolved_state.get((EventTypes.PowerLevels, ""), None)
leftover_events = yield _mainline_sort( leftover_events = yield _mainline_sort(
leftover_events, pl, event_map, state_res_store room_id, leftover_events, pl, event_map, state_res_store
) )
logger.debug("resolving remaining events") logger.debug("resolving remaining events")
resolved_state = yield _iterative_auth_checks( resolved_state = yield _iterative_auth_checks(
room_version, leftover_events, resolved_state, event_map, state_res_store room_id,
room_version,
leftover_events,
resolved_state,
event_map,
state_res_store,
) )
logger.debug("resolved") logger.debug("resolved")
@ -141,11 +166,12 @@ def resolve_events_with_store(room_version, state_sets, event_map, state_res_sto
@defer.inlineCallbacks @defer.inlineCallbacks
def _get_power_level_for_sender(event_id, event_map, state_res_store): def _get_power_level_for_sender(room_id, event_id, event_map, state_res_store):
"""Return the power level of the sender of the given event according to """Return the power level of the sender of the given event according to
their auth events. their auth events.
Args: Args:
room_id (str)
event_id (str) event_id (str)
event_map (dict[str,FrozenEvent]) event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore) state_res_store (StateResolutionStore)
@ -153,11 +179,11 @@ def _get_power_level_for_sender(event_id, event_map, state_res_store):
Returns: Returns:
Deferred[int] Deferred[int]
""" """
event = yield _get_event(event_id, event_map, state_res_store) event = yield _get_event(room_id, event_id, event_map, state_res_store)
pl = None pl = None
for aid in event.auth_event_ids(): for aid in event.auth_event_ids():
aev = yield _get_event(aid, event_map, state_res_store) aev = yield _get_event(room_id, aid, event_map, state_res_store)
if (aev.type, aev.state_key) == (EventTypes.PowerLevels, ""): if (aev.type, aev.state_key) == (EventTypes.PowerLevels, ""):
pl = aev pl = aev
break break
@ -165,7 +191,7 @@ def _get_power_level_for_sender(event_id, event_map, state_res_store):
if pl is None: if pl is None:
# Couldn't find power level. Check if they're the creator of the room # Couldn't find power level. Check if they're the creator of the room
for aid in event.auth_event_ids(): for aid in event.auth_event_ids():
aev = yield _get_event(aid, event_map, state_res_store) aev = yield _get_event(room_id, aid, event_map, state_res_store)
if (aev.type, aev.state_key) == (EventTypes.Create, ""): if (aev.type, aev.state_key) == (EventTypes.Create, ""):
if aev.content.get("creator") == event.sender: if aev.content.get("creator") == event.sender:
return 100 return 100
@ -279,7 +305,7 @@ def _is_power_event(event):
@defer.inlineCallbacks @defer.inlineCallbacks
def _add_event_and_auth_chain_to_graph( def _add_event_and_auth_chain_to_graph(
graph, event_id, event_map, state_res_store, auth_diff graph, room_id, event_id, event_map, state_res_store, auth_diff
): ):
"""Helper function for _reverse_topological_power_sort that add the event """Helper function for _reverse_topological_power_sort that add the event
and its auth chain (that is in the auth diff) to the graph and its auth chain (that is in the auth diff) to the graph
@ -287,6 +313,7 @@ def _add_event_and_auth_chain_to_graph(
Args: Args:
graph (dict[str, set[str]]): A map from event ID to the events auth graph (dict[str, set[str]]): A map from event ID to the events auth
event IDs event IDs
room_id (str): the room we are working in
event_id (str): Event to add to the graph event_id (str): Event to add to the graph
event_map (dict[str,FrozenEvent]) event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore) state_res_store (StateResolutionStore)
@ -298,7 +325,7 @@ def _add_event_and_auth_chain_to_graph(
eid = state.pop() eid = state.pop()
graph.setdefault(eid, set()) graph.setdefault(eid, set())
event = yield _get_event(eid, event_map, state_res_store) event = yield _get_event(room_id, eid, event_map, state_res_store)
for aid in event.auth_event_ids(): for aid in event.auth_event_ids():
if aid in auth_diff: if aid in auth_diff:
if aid not in graph: if aid not in graph:
@ -308,11 +335,14 @@ def _add_event_and_auth_chain_to_graph(
@defer.inlineCallbacks @defer.inlineCallbacks
def _reverse_topological_power_sort(event_ids, event_map, state_res_store, auth_diff): def _reverse_topological_power_sort(
room_id, event_ids, event_map, state_res_store, auth_diff
):
"""Returns a list of the event_ids sorted by reverse topological ordering, """Returns a list of the event_ids sorted by reverse topological ordering,
and then by power level and origin_server_ts and then by power level and origin_server_ts
Args: Args:
room_id (str): the room we are working in
event_ids (list[str]): The events to sort event_ids (list[str]): The events to sort
event_map (dict[str,FrozenEvent]) event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore) state_res_store (StateResolutionStore)
@ -325,12 +355,14 @@ def _reverse_topological_power_sort(event_ids, event_map, state_res_store, auth_
graph = {} graph = {}
for event_id in event_ids: for event_id in event_ids:
yield _add_event_and_auth_chain_to_graph( yield _add_event_and_auth_chain_to_graph(
graph, event_id, event_map, state_res_store, auth_diff graph, room_id, event_id, event_map, state_res_store, auth_diff
) )
event_to_pl = {} event_to_pl = {}
for event_id in graph: for event_id in graph:
pl = yield _get_power_level_for_sender(event_id, event_map, state_res_store) pl = yield _get_power_level_for_sender(
room_id, event_id, event_map, state_res_store
)
event_to_pl[event_id] = pl event_to_pl[event_id] = pl
def _get_power_order(event_id): def _get_power_order(event_id):
@ -348,12 +380,13 @@ def _reverse_topological_power_sort(event_ids, event_map, state_res_store, auth_
@defer.inlineCallbacks @defer.inlineCallbacks
def _iterative_auth_checks( def _iterative_auth_checks(
room_version, event_ids, base_state, event_map, state_res_store room_id, room_version, event_ids, base_state, event_map, state_res_store
): ):
"""Sequentially apply auth checks to each event in given list, updating the """Sequentially apply auth checks to each event in given list, updating the
state as it goes along. state as it goes along.
Args: Args:
room_id (str)
room_version (str) room_version (str)
event_ids (list[str]): Ordered list of events to apply auth checks to event_ids (list[str]): Ordered list of events to apply auth checks to
base_state (dict[tuple[str, str], str]): The set of state to start with base_state (dict[tuple[str, str], str]): The set of state to start with
@ -370,7 +403,7 @@ def _iterative_auth_checks(
auth_events = {} auth_events = {}
for aid in event.auth_event_ids(): for aid in event.auth_event_ids():
ev = yield _get_event(aid, event_map, state_res_store) ev = yield _get_event(room_id, aid, event_map, state_res_store)
if ev.rejected_reason is None: if ev.rejected_reason is None:
auth_events[(ev.type, ev.state_key)] = ev auth_events[(ev.type, ev.state_key)] = ev
@ -378,7 +411,7 @@ def _iterative_auth_checks(
for key in event_auth.auth_types_for_event(event): for key in event_auth.auth_types_for_event(event):
if key in resolved_state: if key in resolved_state:
ev_id = resolved_state[key] ev_id = resolved_state[key]
ev = yield _get_event(ev_id, event_map, state_res_store) ev = yield _get_event(room_id, ev_id, event_map, state_res_store)
if ev.rejected_reason is None: if ev.rejected_reason is None:
auth_events[key] = event_map[ev_id] auth_events[key] = event_map[ev_id]
@ -400,11 +433,14 @@ def _iterative_auth_checks(
@defer.inlineCallbacks @defer.inlineCallbacks
def _mainline_sort(event_ids, resolved_power_event_id, event_map, state_res_store): def _mainline_sort(
room_id, event_ids, resolved_power_event_id, event_map, state_res_store
):
"""Returns a sorted list of event_ids sorted by mainline ordering based on """Returns a sorted list of event_ids sorted by mainline ordering based on
the given event resolved_power_event_id the given event resolved_power_event_id
Args: Args:
room_id (str): room we're working in
event_ids (list[str]): Events to sort event_ids (list[str]): Events to sort
resolved_power_event_id (str): The final resolved power level event ID resolved_power_event_id (str): The final resolved power level event ID
event_map (dict[str,FrozenEvent]) event_map (dict[str,FrozenEvent])
@ -417,11 +453,11 @@ def _mainline_sort(event_ids, resolved_power_event_id, event_map, state_res_stor
pl = resolved_power_event_id pl = resolved_power_event_id
while pl: while pl:
mainline.append(pl) mainline.append(pl)
pl_ev = yield _get_event(pl, event_map, state_res_store) pl_ev = yield _get_event(room_id, pl, event_map, state_res_store)
auth_events = pl_ev.auth_event_ids() auth_events = pl_ev.auth_event_ids()
pl = None pl = None
for aid in auth_events: for aid in auth_events:
ev = yield _get_event(aid, event_map, state_res_store) ev = yield _get_event(room_id, aid, event_map, state_res_store)
if (ev.type, ev.state_key) == (EventTypes.PowerLevels, ""): if (ev.type, ev.state_key) == (EventTypes.PowerLevels, ""):
pl = aid pl = aid
break break
@ -457,6 +493,8 @@ def _get_mainline_depth_for_event(event, mainline_map, event_map, state_res_stor
Deferred[int] Deferred[int]
""" """
room_id = event.room_id
# We do an iterative search, replacing `event with the power level in its # We do an iterative search, replacing `event with the power level in its
# auth events (if any) # auth events (if any)
while event: while event:
@ -468,7 +506,7 @@ def _get_mainline_depth_for_event(event, mainline_map, event_map, state_res_stor
event = None event = None
for aid in auth_events: for aid in auth_events:
aev = yield _get_event(aid, event_map, state_res_store) aev = yield _get_event(room_id, aid, event_map, state_res_store)
if (aev.type, aev.state_key) == (EventTypes.PowerLevels, ""): if (aev.type, aev.state_key) == (EventTypes.PowerLevels, ""):
event = aev event = aev
break break
@ -478,11 +516,12 @@ def _get_mainline_depth_for_event(event, mainline_map, event_map, state_res_stor
@defer.inlineCallbacks @defer.inlineCallbacks
def _get_event(event_id, event_map, state_res_store): def _get_event(room_id, event_id, event_map, state_res_store):
"""Helper function to look up event in event_map, falling back to looking """Helper function to look up event in event_map, falling back to looking
it up in the store it up in the store
Args: Args:
room_id (str)
event_id (str) event_id (str)
event_map (dict[str,FrozenEvent]) event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore) state_res_store (StateResolutionStore)
@ -493,7 +532,14 @@ def _get_event(event_id, event_map, state_res_store):
if event_id not in event_map: if event_id not in event_map:
events = yield state_res_store.get_events([event_id], allow_rejected=True) events = yield state_res_store.get_events([event_id], allow_rejected=True)
event_map.update(events) event_map.update(events)
return event_map[event_id] event = event_map[event_id]
assert event is not None
if event.room_id != room_id:
raise Exception(
"In state res for room %s, event %s is in %s"
% (room_id, event_id, event.room_id)
)
return event
def lexicographical_topological_sort(graph, key): def lexicographical_topological_sort(graph, key):

4
synapse/util/async_helpers.py
View File

@ -140,8 +140,8 @@ def concurrently_execute(func, args, limit):
Args: Args:
func (func): Function to execute, should return a deferred or coroutine. func (func): Function to execute, should return a deferred or coroutine.
args (list): List of arguments to pass to func, each invocation of func args (Iterable): List of arguments to pass to func, each invocation of func
gets a signle argument. gets a single argument.
limit (int): Maximum number of conccurent executions. limit (int): Maximum number of conccurent executions.
Returns: Returns:

3
synapse/visibility.py
View File

@ -52,7 +52,8 @@ def filter_events_for_client(
apply_retention_policies=True, apply_retention_policies=True,
): ):
""" """
Check which events a user is allowed to see Check which events a user is allowed to see. If the user can see the event but its
sender asked for their data to be erased, prune the content of the event.
Args: Args:
storage storage

127
tests/rest/client/v1/test_rooms.py
View File

@ -29,6 +29,7 @@ import synapse.rest.admin
from synapse.api.constants import EventContentFields, EventTypes, Membership from synapse.api.constants import EventContentFields, EventTypes, Membership
from synapse.handlers.pagination import PurgeStatus from synapse.handlers.pagination import PurgeStatus
from synapse.rest.client.v1 import login, profile, room from synapse.rest.client.v1 import login, profile, room
from synapse.rest.client.v2_alpha import account
from synapse.util.stringutils import random_string from synapse.util.stringutils import random_string
from tests import unittest from tests import unittest
@ -1597,3 +1598,129 @@ class LabelsTestCase(unittest.HomeserverTestCase):
) )
return event_id return event_id
class ContextTestCase(unittest.HomeserverTestCase):
servlets = [
synapse.rest.admin.register_servlets_for_client_rest_resource,
room.register_servlets,
login.register_servlets,
account.register_servlets,
]
def prepare(self, reactor, clock, homeserver):
self.user_id = self.register_user("user", "password")
self.tok = self.login("user", "password")
self.room_id = self.helper.create_room_as(self.user_id, tok=self.tok)
self.other_user_id = self.register_user("user2", "password")
self.other_tok = self.login("user2", "password")
self.helper.invite(self.room_id, self.user_id, self.other_user_id, tok=self.tok)
self.helper.join(self.room_id, self.other_user_id, tok=self.other_tok)
def test_erased_sender(self):
"""Test that an erasure request results in the requester's events being hidden
from any new member of the room.
"""
# Send a bunch of events in the room.
self.helper.send(self.room_id, "message 1", tok=self.tok)
self.helper.send(self.room_id, "message 2", tok=self.tok)
event_id = self.helper.send(self.room_id, "message 3", tok=self.tok)["event_id"]
self.helper.send(self.room_id, "message 4", tok=self.tok)
self.helper.send(self.room_id, "message 5", tok=self.tok)
# Check that we can still see the messages before the erasure request.
request, channel = self.make_request(
"GET",
'/rooms/%s/context/%s?filter={"types":["m.room.message"]}'
% (self.room_id, event_id),
access_token=self.tok,
)
self.render(request)
self.assertEqual(channel.code, 200, channel.result)
events_before = channel.json_body["events_before"]
self.assertEqual(len(events_before), 2, events_before)
self.assertEqual(
events_before[0].get("content", {}).get("body"),
"message 2",
events_before[0],
)
self.assertEqual(
events_before[1].get("content", {}).get("body"),
"message 1",
events_before[1],
)
self.assertEqual(
channel.json_body["event"].get("content", {}).get("body"),
"message 3",
channel.json_body["event"],
)
events_after = channel.json_body["events_after"]
self.assertEqual(len(events_after), 2, events_after)
self.assertEqual(
events_after[0].get("content", {}).get("body"),
"message 4",
events_after[0],
)
self.assertEqual(
events_after[1].get("content", {}).get("body"),
"message 5",
events_after[1],
)
# Deactivate the first account and erase the user's data.
deactivate_account_handler = self.hs.get_deactivate_account_handler()
self.get_success(
deactivate_account_handler.deactivate_account(self.user_id, erase_data=True)
)
# Invite another user in the room. This is needed because messages will be
# pruned only if the user wasn't a member of the room when the messages were
# sent.
invited_user_id = self.register_user("user3", "password")
invited_tok = self.login("user3", "password")
self.helper.invite(
self.room_id, self.other_user_id, invited_user_id, tok=self.other_tok
)
self.helper.join(self.room_id, invited_user_id, tok=invited_tok)
# Check that a user that joined the room after the erasure request can't see
# the messages anymore.
request, channel = self.make_request(
"GET",
'/rooms/%s/context/%s?filter={"types":["m.room.message"]}'
% (self.room_id, event_id),
access_token=invited_tok,
)
self.render(request)
self.assertEqual(channel.code, 200, channel.result)
events_before = channel.json_body["events_before"]
self.assertEqual(len(events_before), 2, events_before)
self.assertDictEqual(events_before[0].get("content"), {}, events_before[0])
self.assertDictEqual(events_before[1].get("content"), {}, events_before[1])
self.assertDictEqual(
channel.json_body["event"].get("content"), {}, channel.json_body["event"]
)
events_after = channel.json_body["events_after"]
self.assertEqual(len(events_after), 2, events_after)
self.assertDictEqual(events_after[0].get("content"), {}, events_after[0])
self.assertEqual(events_after[1].get("content"), {}, events_after[1])

3
tests/state/test_v2.py
View File

@ -58,6 +58,7 @@ class FakeEvent(object):
self.type = type self.type = type
self.state_key = state_key self.state_key = state_key
self.content = content self.content = content
self.room_id = ROOM_ID
def to_event(self, auth_events, prev_events): def to_event(self, auth_events, prev_events):
"""Given the auth_events and prev_events, convert to a Frozen Event """Given the auth_events and prev_events, convert to a Frozen Event
@ -418,6 +419,7 @@ class StateTestCase(unittest.TestCase):
state_before = dict(state_at_event[prev_events[0]]) state_before = dict(state_at_event[prev_events[0]])
else: else:
state_d = resolve_events_with_store( state_d = resolve_events_with_store(
ROOM_ID,
RoomVersions.V2.identifier, RoomVersions.V2.identifier,
[state_at_event[n] for n in prev_events], [state_at_event[n] for n in prev_events],
event_map=event_map, event_map=event_map,
@ -565,6 +567,7 @@ class SimpleParamStateTestCase(unittest.TestCase):
# Test that we correctly handle passing `None` as the event_map # Test that we correctly handle passing `None` as the event_map
state_d = resolve_events_with_store( state_d = resolve_events_with_store(
ROOM_ID,
RoomVersions.V2.identifier, RoomVersions.V2.identifier,
[self.state_at_bob, self.state_at_charlie], [self.state_at_bob, self.state_at_charlie],
event_map=None, event_map=None,