forked-synapse/synapse/handlers/deactivate_account.py
Travis Ralston 2ec257d608
Upon deactivation, forget all of the user's rooms (#17400)
This can help ensure that the rooms are eventually purged if the other
local users also forget them. Synapse already clears some of the room
information as part of the `_background_remove_left_rooms` background
task, but this doesn't catch `events`, `event_json`, etc.
2024-07-05 11:56:52 +01:00

328 lines
13 KiB
Python

#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2019 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
import itertools
import logging
from typing import TYPE_CHECKING, Optional
from synapse.api.constants import Membership
from synapse.api.errors import SynapseError
from synapse.handlers.device import DeviceHandler
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.types import Codes, Requester, UserID, create_requester
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class DeactivateAccountHandler:
"""Handler which deals with deactivating user accounts."""
def __init__(self, hs: "HomeServer"):
self.store = hs.get_datastores().main
self.hs = hs
self._auth_handler = hs.get_auth_handler()
self._device_handler = hs.get_device_handler()
self._room_member_handler = hs.get_room_member_handler()
self._identity_handler = hs.get_identity_handler()
self._profile_handler = hs.get_profile_handler()
self.user_directory_handler = hs.get_user_directory_handler()
self._server_name = hs.hostname
self._third_party_rules = hs.get_module_api_callbacks().third_party_event_rules
# Flag that indicates whether the process to part users from rooms is running
self._user_parter_running = False
self._third_party_rules = hs.get_module_api_callbacks().third_party_event_rules
# Start the user parter loop so it can resume parting users from rooms where
# it left off (if it has work left to do).
if hs.config.worker.run_background_tasks:
hs.get_reactor().callWhenRunning(self._start_user_parting)
self._account_validity_enabled = (
hs.config.account_validity.account_validity_enabled
)
async def deactivate_account(
self,
user_id: str,
erase_data: bool,
requester: Requester,
id_server: Optional[str] = None,
by_admin: bool = False,
) -> bool:
"""Deactivate a user's account
Args:
user_id: ID of user to be deactivated
erase_data: whether to GDPR-erase the user's data
requester: The user attempting to make this change.
id_server: Use the given identity server when unbinding
any threepids. If None then will attempt to unbind using the
identity server specified when binding (if known).
by_admin: Whether this change was made by an administrator.
Returns:
True if identity server supports removing threepids, otherwise False.
"""
# This can only be called on the main process.
assert isinstance(self._device_handler, DeviceHandler)
# Check if this user can be deactivated
if not await self._third_party_rules.check_can_deactivate_user(
user_id, by_admin
):
raise SynapseError(
403, "Deactivation of this user is forbidden", Codes.FORBIDDEN
)
# FIXME: Theoretically there is a race here wherein user resets
# password using threepid.
# delete threepids first. We remove these from the IS so if this fails,
# leave the user still active so they can try again.
# Ideally we would prevent password resets and then do this in the
# background thread.
# This will be set to false if the identity server doesn't support
# unbinding
identity_server_supports_unbinding = True
# Attempt to unbind any known bound threepids to this account from identity
# server(s).
bound_threepids = await self.store.user_get_bound_threepids(user_id)
for medium, address in bound_threepids:
try:
result = await self._identity_handler.try_unbind_threepid(
user_id, medium, address, id_server
)
except Exception:
# Do we want this to be a fatal error or should we carry on?
logger.exception("Failed to remove threepid from ID server")
raise SynapseError(400, "Failed to remove threepid from ID server")
identity_server_supports_unbinding &= result
# Remove any local threepid associations for this account.
local_threepids = await self.store.user_get_threepids(user_id)
for local_threepid in local_threepids:
await self._auth_handler.delete_local_threepid(
user_id, local_threepid.medium, local_threepid.address
)
# delete any devices belonging to the user, which will also
# delete corresponding access tokens.
await self._device_handler.delete_all_devices_for_user(user_id)
# then delete any remaining access tokens which weren't associated with
# a device.
await self._auth_handler.delete_access_tokens_for_user(user_id)
await self.store.user_set_password_hash(user_id, None)
# Most of the pushers will have been deleted when we logged out the
# associated devices above, but we still need to delete pushers not
# associated with devices, e.g. email pushers.
await self.store.delete_all_pushers_for_user(user_id)
# Add the user to a table of users pending deactivation (ie.
# removal from all the rooms they're a member of)
await self.store.add_user_pending_deactivation(user_id)
# delete from user directory
await self.user_directory_handler.handle_local_user_deactivated(user_id)
# Mark the user as erased, if they asked for that
if erase_data:
user = UserID.from_string(user_id)
# Remove avatar URL from this user
await self._profile_handler.set_avatar_url(
user, requester, "", by_admin, deactivation=True
)
# Remove displayname from this user
await self._profile_handler.set_displayname(
user, requester, "", by_admin, deactivation=True
)
logger.info("Marking %s as erased", user_id)
await 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()
# Reject all pending invites and knocks for the user, so that the
# user doesn't show up in the "invited" section of rooms' members list.
await self._reject_pending_invites_and_knocks_for_user(user_id)
# Remove all information on the user from the account_validity table.
if self._account_validity_enabled:
await self.store.delete_account_validity_for_user(user_id)
# Mark the user as deactivated.
await self.store.set_user_deactivated_status(user_id, True)
# Remove account data (including ignored users and push rules).
await self.store.purge_account_data_for_user(user_id)
# Delete any server-side backup keys
await self.store.bulk_delete_backup_keys_and_versions_for_user(user_id)
# Let modules know the user has been deactivated.
await self._third_party_rules.on_user_deactivation_status_changed(
user_id,
True,
by_admin,
)
return identity_server_supports_unbinding
async def _reject_pending_invites_and_knocks_for_user(self, user_id: str) -> None:
"""Reject pending invites and knocks addressed to a given user ID.
Args:
user_id: The user ID to reject pending invites and knocks for.
"""
user = UserID.from_string(user_id)
pending_invites = await self.store.get_invited_rooms_for_local_user(user_id)
pending_knocks = await self.store.get_knocked_at_rooms_for_local_user(user_id)
for room in itertools.chain(pending_invites, pending_knocks):
try:
await self._room_member_handler.update_membership(
create_requester(user, authenticated_entity=self._server_name),
user,
room.room_id,
Membership.LEAVE,
ratelimit=False,
require_consent=False,
)
logger.info(
"Rejected %r for deactivated user %r in room %r",
room.membership,
user_id,
room.room_id,
)
except Exception:
logger.exception(
"Failed to reject %r for user %r in room %r:"
" ignoring and continuing",
room.membership,
user_id,
room.room_id,
)
def _start_user_parting(self) -> None:
"""
Start the process that goes through the table of users
pending deactivation, if it isn't already running.
"""
if not self._user_parter_running:
run_as_background_process("user_parter_loop", self._user_parter_loop)
async def _user_parter_loop(self) -> None:
"""Loop that parts deactivated users from rooms"""
self._user_parter_running = True
logger.info("Starting user parter")
try:
while True:
user_id = await self.store.get_user_pending_deactivation()
if user_id is None:
break
logger.info("User parter parting %r", user_id)
await self._part_user(user_id)
await self.store.del_user_pending_deactivation(user_id)
logger.info("User parter finished parting %r", user_id)
logger.info("User parter finished: stopping")
finally:
self._user_parter_running = False
async def _part_user(self, user_id: str) -> None:
"""Causes the given user_id to leave all the rooms they're joined to"""
user = UserID.from_string(user_id)
rooms_for_user = await self.store.get_rooms_for_user(user_id)
requester = create_requester(user, authenticated_entity=self._server_name)
should_erase = await self.store.is_user_erased(user_id)
for room_id in rooms_for_user:
logger.info("User parter parting %r from %r", user_id, room_id)
try:
# Before parting the user, redact all membership events if requested
if should_erase:
event_ids = await self.store.get_membership_event_ids_for_user(
user_id, room_id
)
for event_id in event_ids:
await self.store.expire_event(event_id)
await self._room_member_handler.update_membership(
requester,
user,
room_id,
"leave",
ratelimit=False,
require_consent=False,
)
# Mark the room forgotten too, because they won't be able to do this
# for us. This may lead to the room being purged eventually.
await self._room_member_handler.forget(user, room_id)
except Exception:
logger.exception(
"Failed to part user %r from room %r: ignoring and continuing",
user_id,
room_id,
)
async def activate_account(self, user_id: str) -> None:
"""
Activate an account that was previously deactivated.
This marks the user as active and not erased in the database, but does
not attempt to rejoin rooms, re-add threepids, etc.
If enabled, the user will be re-added to the user directory.
The user will also need a password hash set to actually login.
Args:
user_id: ID of user to be re-activated
"""
user = UserID.from_string(user_id)
# Ensure the user is not marked as erased.
await self.store.mark_user_not_erased(user_id)
# Mark the user as active.
await self.store.set_user_deactivated_status(user_id, False)
await self._third_party_rules.on_user_deactivation_status_changed(
user_id, False, True
)
# Add the user to the directory, if necessary. Note that
# this must be done after the user is re-activated, because
# deactivated users are excluded from the user directory.
profile = await self.store.get_profileinfo(user)
await self.user_directory_handler.handle_local_profile_change(user_id, profile)