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Merge pull request #3431 from matrix-org/rav/erasure_visibility

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Support hiding events from deleted users
This commit is contained in:
Erik Johnston 2018-06-22 15:06:44 +01:00 committed by GitHub
commit ce0d911156
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8 changed files with 213 additions and 25 deletions
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7
synapse/handlers/deactivate_account.py
View file

@ -42,7 +42,7 @@ class DeactivateAccountHandler(BaseHandler):
reactor.callWhenRunning(self._start_user_parting)
@defer.inlineCallbacks
def deactivate_account(self, user_id):
def deactivate_account(self, user_id, erase_data):
"""Deactivate a user's account
Args:
@ -92,6 +92,11 @@ class DeactivateAccountHandler(BaseHandler):
# delete from user directory
yield self.user_directory_handler.handle_user_deactivated(user_id)
# Mark the user as erased, if they asked for that
if erase_data:
logger.info("Marking %s as erased", user_id)
yield self.store.mark_user_erased(user_id)
# Now start the process that goes through that list and
# parts users from rooms (if it isn't already running)
self._start_user_parting()

13
synapse/handlers/federation.py
View file

@ -495,7 +495,20 @@ class FederationHandler(BaseHandler):
for e_id, key_to_eid in event_to_state_ids.iteritems()
}
erased_senders = yield self.store.are_users_erased(
e.sender for e in events,
)
def redact_disallowed(event, state):
# if the sender has been gdpr17ed, always return a redacted
# copy of the event.
if erased_senders[event.sender]:
logger.info(
"Sender of %s has been erased, redacting",
event.event_id,
)
return prune_event(event)
if not state:
return event

4
synapse/rest/client/v1/admin.py
View file

@ -254,7 +254,9 @@ class DeactivateAccountRestServlet(ClientV1RestServlet):
if not is_admin:
raise AuthError(403, "You are not a server admin")
yield self._deactivate_account_handler.deactivate_account(target_user_id)
yield self._deactivate_account_handler.deactivate_account(
target_user_id, False,
)
defer.returnValue((200, {}))

13
synapse/rest/client/v2_alpha/account.py
View file

@ -1,6 +1,7 @@
# -*- coding: utf-8 -*-
# Copyright 2015, 2016 OpenMarket Ltd
# Copyright 2017 Vector Creations Ltd
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
@ -15,6 +16,7 @@
# limitations under the License.
import logging
from six.moves import http_client
from twisted.internet import defer
from synapse.api.auth import has_access_token
@ -186,13 +188,20 @@ class DeactivateAccountRestServlet(RestServlet):
@defer.inlineCallbacks
def on_POST(self, request):
body = parse_json_object_from_request(request)
erase = body.get("erase", False)
if not isinstance(erase, bool):
raise SynapseError(
http_client.BAD_REQUEST,
"Param 'erase' must be a boolean, if given",
Codes.BAD_JSON,
)
requester = yield self.auth.get_user_by_req(request)
# allow ASes to dectivate their own users
if requester.app_service:
yield self._deactivate_account_handler.deactivate_account(
requester.user.to_string()
requester.user.to_string(), erase,
)
defer.returnValue((200, {}))
@ -200,7 +209,7 @@ class DeactivateAccountRestServlet(RestServlet):
requester, body, self.hs.get_ip_from_request(request),
)
yield self._deactivate_account_handler.deactivate_account(
requester.user.to_string(),
requester.user.to_string(), erase,
)
defer.returnValue((200, {}))

2
synapse/storage/__init__.py
View file

@ -20,6 +20,7 @@ import time
import logging
from synapse.storage.devices import DeviceStore
from synapse.storage.user_erasure_store import UserErasureStore
from .appservice import (
ApplicationServiceStore, ApplicationServiceTransactionStore
)
@ -88,6 +89,7 @@ class DataStore(RoomMemberStore, RoomStore,
DeviceInboxStore,
UserDirectoryStore,
GroupServerStore,
UserErasureStore,
):
def __init__(self, db_conn, hs):

21
synapse/storage/schema/delta/50/erasure_store.sql Normal file
View file

@ -0,0 +1,21 @@
/* Copyright 2018 New Vector Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
-- a table of users who have requested that their details be erased
CREATE TABLE erased_users (
user_id TEXT NOT NULL
);
CREATE UNIQUE INDEX erased_users_user ON erased_users(user_id);

103
synapse/storage/user_erasure_store.py Normal file
View file

@ -0,0 +1,103 @@
# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import operator
from twisted.internet import defer
from synapse.storage._base import SQLBaseStore
from synapse.util.caches.descriptors import cachedList, cached
class UserErasureWorkerStore(SQLBaseStore):
@cached()
def is_user_erased(self, user_id):
"""
Check if the given user id has requested erasure
Args:
user_id (str): full user id to check
Returns:
Deferred[bool]: True if the user has requested erasure
"""
return self._simple_select_onecol(
table="erased_users",
keyvalues={"user_id": user_id},
retcol="1",
desc="is_user_erased",
).addCallback(operator.truth)
@cachedList(
cached_method_name="is_user_erased",
list_name="user_ids",
inlineCallbacks=True,
)
def are_users_erased(self, user_ids):
"""
Checks which users in a list have requested erasure
Args:
user_ids (iterable[str]): full user id to check
Returns:
Deferred[dict[str, bool]]:
for each user, whether the user has requested erasure.
"""
# this serves the dual purpose of (a) making sure we can do len and
# iterate it multiple times, and (b) avoiding duplicates.
user_ids = tuple(set(user_ids))
def _get_erased_users(txn):
txn.execute(
"SELECT user_id FROM erased_users WHERE user_id IN (%s)" % (
",".join("?" * len(user_ids))
),
user_ids,
)
return set(r[0] for r in txn)
erased_users = yield self.runInteraction(
"are_users_erased", _get_erased_users,
)
res = dict((u, u in erased_users) for u in user_ids)
defer.returnValue(res)
class UserErasureStore(UserErasureWorkerStore):
def mark_user_erased(self, user_id):
"""Indicate that user_id wishes their message history to be erased.
Args:
user_id (str): full user_id to be erased
"""
def f(txn):
# first check if they are already in the list
txn.execute(
"SELECT 1 FROM erased_users WHERE user_id = ?",
(user_id, )
)
if txn.fetchone():
return
# they are not already there: do the insert.
txn.execute(
"INSERT INTO erased_users (user_id) VALUES (?)",
(user_id, )
)
self._invalidate_cache_and_stream(
txn, self.is_user_erased, (user_id,)
)
return self.runInteraction("mark_user_erased", f)

75
synapse/visibility.py
View file

@ -12,15 +12,17 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import itertools
import logging
import operator
from twisted.internet import defer
from synapse.api.constants import Membership, EventTypes
from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
from synapse.api.constants import EventTypes, Membership
from synapse.events.utils import prune_event
from synapse.util.logcontext import (
make_deferred_yieldable, preserve_fn,
)
logger = logging.getLogger(__name__)
@ -95,16 +97,27 @@ def filter_events_for_client(store, user_id, events, is_peeking=False,
if ignore_dict_content else []
)
erased_senders = yield store.are_users_erased((e.sender for e in events))
def allowed(event):
"""
Args:
event (synapse.events.EventBase): event to check
Returns:
None|EventBase:
None if the user cannot see this event at all
a redacted copy of the event if they can only see a redacted
version
the original event if they can see it as normal.
"""
if not event.is_state() and event.sender in ignore_list:
return False
return None
if event.event_id in always_include_ids:
return True
return event
state = event_id_to_state[event.event_id]
@ -118,10 +131,6 @@ def filter_events_for_client(store, user_id, events, is_peeking=False,
if visibility not in VISIBILITY_PRIORITY:
visibility = "shared"
# if it was world_readable, it's easy: everyone can read it
if visibility == "world_readable":
return True
# Always allow history visibility events on boundaries. This is done
# by setting the effective visibility to the least restrictive
# of the old vs new.
@ -155,7 +164,7 @@ def filter_events_for_client(store, user_id, events, is_peeking=False,
if membership == "leave" and (
prev_membership == "join" or prev_membership == "invite"
):
return True
return event
new_priority = MEMBERSHIP_PRIORITY.index(membership)
old_priority = MEMBERSHIP_PRIORITY.index(prev_membership)
@ -166,31 +175,55 @@ def filter_events_for_client(store, user_id, events, is_peeking=False,
if membership is None:
membership_event = state.get((EventTypes.Member, user_id), None)
if membership_event:
# XXX why do we do this?
# https://github.com/matrix-org/synapse/issues/3350
if membership_event.event_id not in event_id_forgotten:
membership = membership_event.membership
# if the user was a member of the room at the time of the event,
# they can see it.
if membership == Membership.JOIN:
return True
return event
# otherwise, it depends on the room visibility.
if visibility == "joined":
# we weren't a member at the time of the event, so we can't
# see this event.
return False
return None
elif visibility == "invited":
# user can also see the event if they were *invited* at the time
# of the event.
return membership == Membership.INVITE
return (
event if membership == Membership.INVITE else None
)
else:
# visibility is shared: user can also see the event if they have
# become a member since the event
elif visibility == "shared" and is_peeking:
# if the visibility is shared, users cannot see the event unless
# they have *subequently* joined the room (or were members at the
# time, of course)
#
# XXX: if the user has subsequently joined and then left again,
# ideally we would share history up to the point they left. But
# we don't know when they left.
return not is_peeking
# we don't know when they left. We just treat it as though they
# never joined, and restrict access.
return None
defer.returnValue(list(filter(allowed, events)))
# the visibility is either shared or world_readable, and the user was
# not a member at the time. We allow it, provided the original sender
# has not requested their data to be erased, in which case, we return
# a redacted version.
if erased_senders[event.sender]:
return prune_event(event)
return event
# check each event: gives an iterable[None|EventBase]
filtered_events = itertools.imap(allowed, events)
# remove the None entries
filtered_events = filter(operator.truth, filtered_events)
# we turn it into a list before returning it.
defer.returnValue(list(filtered_events))