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MatrixSynapse/synapse/handlers/device.py

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# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
# Copyright 2019 New Vector Ltd
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# 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 logging
from six import iteritems, itervalues
from twisted.internet import defer
from synapse.api import errors
from synapse.api.constants import EventTypes
from synapse.api.errors import (
FederationDeniedError,
HttpResponseException,
RequestSendFailed,
SynapseError,
)
from synapse.logging.opentracing import log_kv, set_tag, trace
from synapse.types import RoomStreamToken, get_domain_from_id
from synapse.util import stringutils
from synapse.util.async_helpers import Linearizer
from synapse.util.caches.expiringcache import ExpiringCache
from synapse.util.metrics import measure_func
from synapse.util.retryutils import NotRetryingDestination
from ._base import BaseHandler
logger = logging.getLogger(__name__)
MAX_DEVICE_DISPLAY_NAME_LEN = 100
class DeviceWorkerHandler(BaseHandler):
def __init__(self, hs):
super(DeviceWorkerHandler, self).__init__(hs)
self.hs = hs
self.state = hs.get_state_handler()
self.state_store = hs.get_storage().state
self._auth_handler = hs.get_auth_handler()
@trace
@defer.inlineCallbacks
def get_devices_by_user(self, user_id):
"""
Retrieve the given user's devices
Args:
user_id (str):
Returns:
defer.Deferred: list[dict[str, X]]: info on each device
"""
set_tag("user_id", user_id)
device_map = yield self.store.get_devices_by_user(user_id)
ips = yield self.store.get_last_client_ip_by_device(user_id, device_id=None)
devices = list(device_map.values())
for device in devices:
_update_device_from_client_ips(device, ips)
log_kv(device_map)
return devices
@trace
@defer.inlineCallbacks
def get_device(self, user_id, device_id):
""" Retrieve the given device
Args:
user_id (str):
device_id (str):
Returns:
defer.Deferred: dict[str, X]: info on the device
Raises:
errors.NotFoundError: if the device was not found
"""
try:
device = yield self.store.get_device(user_id, device_id)
except errors.StoreError:
raise errors.NotFoundError
ips = yield self.store.get_last_client_ip_by_device(user_id, device_id)
_update_device_from_client_ips(device, ips)
set_tag("device", device)
set_tag("ips", ips)
return device
@measure_func("device.get_user_ids_changed")
@trace
@defer.inlineCallbacks
def get_user_ids_changed(self, user_id, from_token):
"""Get list of users that have had the devices updated, or have newly
joined a room, that `user_id` may be interested in.
Args:
user_id (str)
from_token (StreamToken)
"""
set_tag("user_id", user_id)
set_tag("from_token", from_token)
now_room_key = yield self.store.get_room_events_max_id()
room_ids = yield self.store.get_rooms_for_user(user_id)
# First we check if any devices have changed for users that we share
# rooms with.
users_who_share_room = yield self.store.get_users_who_share_room_with_user(
user_id
)
tracked_users = set(users_who_share_room)
# Always tell the user about their own devices
tracked_users.add(user_id)
changed = yield self.store.get_users_whose_devices_changed(
from_token.device_list_key, tracked_users
)
# Then work out if any users have since joined
rooms_changed = self.store.get_rooms_that_changed(room_ids, from_token.room_key)
member_events = yield self.store.get_membership_changes_for_user(
user_id, from_token.room_key, now_room_key
)
rooms_changed.update(event.room_id for event in member_events)
stream_ordering = RoomStreamToken.parse_stream_token(from_token.room_key).stream
possibly_changed = set(changed)
possibly_left = set()
for room_id in rooms_changed:
current_state_ids = yield self.store.get_current_state_ids(room_id)
# The user may have left the room
# TODO: Check if they actually did or if we were just invited.
if room_id not in room_ids:
for key, event_id in iteritems(current_state_ids):
etype, state_key = key
if etype != EventTypes.Member:
continue
possibly_left.add(state_key)
continue
# Fetch the current state at the time.
try:
event_ids = yield self.store.get_forward_extremeties_for_room(
room_id, stream_ordering=stream_ordering
)
except errors.StoreError:
# we have purged the stream_ordering index since the stream
# ordering: treat it the same as a new room
event_ids = []
# special-case for an empty prev state: include all members
# in the changed list
if not event_ids:
log_kv(
{"event": "encountered empty previous state", "room_id": room_id}
)
for key, event_id in iteritems(current_state_ids):
etype, state_key = key
if etype != EventTypes.Member:
continue
possibly_changed.add(state_key)
continue
current_member_id = current_state_ids.get((EventTypes.Member, user_id))
if not current_member_id:
continue
# mapping from event_id -> state_dict
prev_state_ids = yield self.state_store.get_state_ids_for_events(event_ids)
# Check if we've joined the room? If so we just blindly add all the users to
# the "possibly changed" users.
for state_dict in itervalues(prev_state_ids):
member_event = state_dict.get((EventTypes.Member, user_id), None)
if not member_event or member_event != current_member_id:
for key, event_id in iteritems(current_state_ids):
etype, state_key = key
if etype != EventTypes.Member:
continue
possibly_changed.add(state_key)
break
# If there has been any change in membership, include them in the
# possibly changed list. We'll check if they are joined below,
# and we're not toooo worried about spuriously adding users.
for key, event_id in iteritems(current_state_ids):
etype, state_key = key
if etype != EventTypes.Member:
continue
# check if this member has changed since any of the extremities
# at the stream_ordering, and add them to the list if so.
for state_dict in itervalues(prev_state_ids):
prev_event_id = state_dict.get(key, None)
if not prev_event_id or prev_event_id != event_id:
if state_key != user_id:
possibly_changed.add(state_key)
break
if possibly_changed or possibly_left:
# Take the intersection of the users whose devices may have changed
# and those that actually still share a room with the user
possibly_joined = possibly_changed & users_who_share_room
possibly_left = (possibly_changed | possibly_left) - users_who_share_room
else:
possibly_joined = []
possibly_left = []
result = {"changed": list(possibly_joined), "left": list(possibly_left)}
log_kv(result)
return result
@defer.inlineCallbacks
def on_federation_query_user_devices(self, user_id):
stream_id, devices = yield self.store.get_devices_with_keys_by_user(user_id)
master_key = yield self.store.get_e2e_cross_signing_key(user_id, "master")
self_signing_key = yield self.store.get_e2e_cross_signing_key(
user_id, "self_signing"
)
return {
"user_id": user_id,
"stream_id": stream_id,
"devices": devices,
"master_key": master_key,
"self_signing_key": self_signing_key,
}
class DeviceHandler(DeviceWorkerHandler):
def __init__(self, hs):
super(DeviceHandler, self).__init__(hs)
self.federation_sender = hs.get_federation_sender()
self.device_list_updater = DeviceListUpdater(hs, self)
federation_registry = hs.get_federation_registry()
federation_registry.register_edu_handler(
"m.device_list_update", self.device_list_updater.incoming_device_list_update
)
hs.get_distributor().observe("user_left_room", self.user_left_room)
@defer.inlineCallbacks
def check_device_registered(
self, user_id, device_id, initial_device_display_name=None
):
"""
If the given device has not been registered, register it with the
supplied display name.
If no device_id is supplied, we make one up.
Args:
user_id (str): @user:id
device_id (str | None): device id supplied by client
initial_device_display_name (str | None): device display name from
client
Returns:
str: device id (generated if none was supplied)
"""
if device_id is not None:
new_device = yield self.store.store_device(
user_id=user_id,
device_id=device_id,
initial_device_display_name=initial_device_display_name,
)
if new_device:
yield self.notify_device_update(user_id, [device_id])
return device_id
# if the device id is not specified, we'll autogen one, but loop a few
# times in case of a clash.
attempts = 0
while attempts < 5:
device_id = stringutils.random_string(10).upper()
new_device = yield self.store.store_device(
user_id=user_id,
device_id=device_id,
initial_device_display_name=initial_device_display_name,
)
if new_device:
yield self.notify_device_update(user_id, [device_id])
return device_id
attempts += 1
raise errors.StoreError(500, "Couldn't generate a device ID.")
@trace
@defer.inlineCallbacks
def delete_device(self, user_id, device_id):
""" Delete the given device
Args:
user_id (str):
device_id (str):
Returns:
defer.Deferred:
"""
try:
yield self.store.delete_device(user_id, device_id)
except errors.StoreError as e:
if e.code == 404:
# no match
set_tag("error", True)
log_kv(
{"reason": "User doesn't have device id.", "device_id": device_id}
)
pass
else:
raise
yield self._auth_handler.delete_access_tokens_for_user(
user_id, device_id=device_id
)
yield self.store.delete_e2e_keys_by_device(user_id=user_id, device_id=device_id)
yield self.notify_device_update(user_id, [device_id])
@trace
@defer.inlineCallbacks
def delete_all_devices_for_user(self, user_id, except_device_id=None):
"""Delete all of the user's devices
Args:
user_id (str):
except_device_id (str|None): optional device id which should not
be deleted
Returns:
defer.Deferred:
"""
device_map = yield self.store.get_devices_by_user(user_id)
device_ids = list(device_map)
if except_device_id is not None:
device_ids = [d for d in device_ids if d != except_device_id]
yield self.delete_devices(user_id, device_ids)
@defer.inlineCallbacks
def delete_devices(self, user_id, device_ids):
""" Delete several devices
Args:
user_id (str):
device_ids (List[str]): The list of device IDs to delete
Returns:
defer.Deferred:
"""
try:
yield self.store.delete_devices(user_id, device_ids)
except errors.StoreError as e:
if e.code == 404:
# no match
set_tag("error", True)
set_tag("reason", "User doesn't have that device id.")
pass
else:
raise
# Delete access tokens and e2e keys for each device. Not optimised as it is not
# considered as part of a critical path.
for device_id in device_ids:
yield self._auth_handler.delete_access_tokens_for_user(
user_id, device_id=device_id
)
yield self.store.delete_e2e_keys_by_device(
user_id=user_id, device_id=device_id
)
yield self.notify_device_update(user_id, device_ids)
@defer.inlineCallbacks
def update_device(self, user_id, device_id, content):
""" Update the given device
Args:
user_id (str):
device_id (str):
content (dict): body of update request
Returns:
defer.Deferred:
"""
# Reject a new displayname which is too long.
new_display_name = content.get("display_name")
if new_display_name and len(new_display_name) > MAX_DEVICE_DISPLAY_NAME_LEN:
raise SynapseError(
400,
"Device display name is too long (max %i)"
% (MAX_DEVICE_DISPLAY_NAME_LEN,),
)
try:
yield self.store.update_device(
user_id, device_id, new_display_name=new_display_name
)
yield self.notify_device_update(user_id, [device_id])
except errors.StoreError as e:
if e.code == 404:
raise errors.NotFoundError()
else:
raise
@trace
@measure_func("notify_device_update")
@defer.inlineCallbacks
def notify_device_update(self, user_id, device_ids):
"""Notify that a user's device(s) has changed. Pokes the notifier, and
remote servers if the user is local.
"""
users_who_share_room = yield self.store.get_users_who_share_room_with_user(
user_id
)
hosts = set()
if self.hs.is_mine_id(user_id):
hosts.update(get_domain_from_id(u) for u in users_who_share_room)
hosts.discard(self.server_name)
set_tag("target_hosts", hosts)
position = yield self.store.add_device_change_to_streams(
user_id, device_ids, list(hosts)
)
for device_id in device_ids:
logger.debug(
"Notifying about update %r/%r, ID: %r", user_id, device_id, position
)
room_ids = yield self.store.get_rooms_for_user(user_id)
# specify the user ID too since the user should always get their own device list
# updates, even if they aren't in any rooms.
yield self.notifier.on_new_event(
"device_list_key", position, users=[user_id], rooms=room_ids
)
if hosts:
logger.info(
"Sending device list update notif for %r to: %r", user_id, hosts
)
for host in hosts:
self.federation_sender.send_device_messages(host)
log_kv({"message": "sent device update to host", "host": host})
@defer.inlineCallbacks
def notify_user_signature_update(self, from_user_id, user_ids):
"""Notify a user that they have made new signatures of other users.
Args:
from_user_id (str): the user who made the signature
user_ids (list[str]): the users IDs that have new signatures
"""
position = yield self.store.add_user_signature_change_to_streams(
from_user_id, user_ids
)
self.notifier.on_new_event("device_list_key", position, users=[from_user_id])
@defer.inlineCallbacks
def user_left_room(self, user, room_id):
user_id = user.to_string()
room_ids = yield self.store.get_rooms_for_user(user_id)
if not room_ids:
# We no longer share rooms with this user, so we'll no longer
# receive device updates. Mark this in DB.
yield self.store.mark_remote_user_device_list_as_unsubscribed(user_id)
def _update_device_from_client_ips(device, client_ips):
ip = client_ips.get((device["user_id"], device["device_id"]), {})
device.update({"last_seen_ts": ip.get("last_seen"), "last_seen_ip": ip.get("ip")})
class DeviceListUpdater(object):
"Handles incoming device list updates from federation and updates the DB"
def __init__(self, hs, device_handler):
self.store = hs.get_datastore()
self.federation = hs.get_federation_client()
self.clock = hs.get_clock()
self.device_handler = device_handler
self._remote_edu_linearizer = Linearizer(name="remote_device_list")
# user_id -> list of updates waiting to be handled.
self._pending_updates = {}
# Recently seen stream ids. We don't bother keeping these in the DB,
# but they're useful to have them about to reduce the number of spurious
# resyncs.
self._seen_updates = ExpiringCache(
cache_name="device_update_edu",
clock=self.clock,
max_len=10000,
expiry_ms=30 * 60 * 1000,
iterable=True,
)
@trace
@defer.inlineCallbacks
def incoming_device_list_update(self, origin, edu_content):
"""Called on incoming device list update from federation. Responsible
for parsing the EDU and adding to pending updates list.
"""
set_tag("origin", origin)
set_tag("edu_content", edu_content)
user_id = edu_content.pop("user_id")
device_id = edu_content.pop("device_id")
stream_id = str(edu_content.pop("stream_id")) # They may come as ints
prev_ids = edu_content.pop("prev_id", [])
prev_ids = [str(p) for p in prev_ids] # They may come as ints
if get_domain_from_id(user_id) != origin:
# TODO: Raise?
logger.warning(
"Got device list update edu for %r/%r from %r",
user_id,
device_id,
origin,
)
set_tag("error", True)
log_kv(
{
"message": "Got a device list update edu from a user and "
"device which does not match the origin of the request.",
"user_id": user_id,
"device_id": device_id,
}
)
return
room_ids = yield self.store.get_rooms_for_user(user_id)
if not room_ids:
# We don't share any rooms with this user. Ignore update, as we
# probably won't get any further updates.
set_tag("error", True)
log_kv(
{
"message": "Got an update from a user for which "
"we don't share any rooms",
"other user_id": user_id,
}
)
logger.warning(
"Got device list update edu for %r/%r, but don't share a room",
user_id,
device_id,
)
return
logger.debug("Received device list update for %r/%r", user_id, device_id)
self._pending_updates.setdefault(user_id, []).append(
(device_id, stream_id, prev_ids, edu_content)
)
yield self._handle_device_updates(user_id)
@measure_func("_incoming_device_list_update")
@defer.inlineCallbacks
def _handle_device_updates(self, user_id):
"Actually handle pending updates."
with (yield self._remote_edu_linearizer.queue(user_id)):
pending_updates = self._pending_updates.pop(user_id, [])
if not pending_updates:
# This can happen since we batch updates
return
for device_id, stream_id, prev_ids, content in pending_updates:
logger.debug(
"Handling update %r/%r, ID: %r, prev: %r ",
user_id,
device_id,
stream_id,
prev_ids,
)
# Given a list of updates we check if we need to resync. This
# happens if we've missed updates.
resync = yield self._need_to_do_resync(user_id, pending_updates)
if logger.isEnabledFor(logging.INFO):
logger.info(
"Received device list update for %s, requiring resync: %s. Devices: %s",
user_id,
resync,
", ".join(u[0] for u in pending_updates),
)
if resync:
yield self.user_device_resync(user_id)
else:
# Simply update the single device, since we know that is the only
# change (because of the single prev_id matching the current cache)
for device_id, stream_id, prev_ids, content in pending_updates:
yield self.store.update_remote_device_list_cache_entry(
user_id, device_id, content, stream_id
)
yield self.device_handler.notify_device_update(
user_id, [device_id for device_id, _, _, _ in pending_updates]
)
self._seen_updates.setdefault(user_id, set()).update(
stream_id for _, stream_id, _, _ in pending_updates
)
@defer.inlineCallbacks
def _need_to_do_resync(self, user_id, updates):
"""Given a list of updates for a user figure out if we need to do a full
resync, or whether we have enough data that we can just apply the delta.
"""
seen_updates = self._seen_updates.get(user_id, set())
extremity = yield self.store.get_device_list_last_stream_id_for_remote(user_id)
logger.debug("Current extremity for %r: %r", user_id, extremity)
stream_id_in_updates = set() # stream_ids in updates list
for _, stream_id, prev_ids, _ in updates:
if not prev_ids:
# We always do a resync if there are no previous IDs
return True
for prev_id in prev_ids:
if prev_id == extremity:
continue
elif prev_id in seen_updates:
continue
elif prev_id in stream_id_in_updates:
continue
else:
return True
stream_id_in_updates.add(stream_id)
return False
@defer.inlineCallbacks
def user_device_resync(self, user_id):
"""Fetches all devices for a user and updates the device cache with them.
Args:
user_id (str): The user's id whose device_list will be updated.
Returns:
Deferred[dict]: a dict with device info as under the "devices" in the result of this
request:
https://matrix.org/docs/spec/server_server/r0.1.2#get-matrix-federation-v1-user-devices-userid
"""
log_kv({"message": "Doing resync to update device list."})
# Fetch all devices for the user.
origin = get_domain_from_id(user_id)
try:
result = yield self.federation.query_user_devices(origin, user_id)
except (NotRetryingDestination, RequestSendFailed, HttpResponseException):
# TODO: Remember that we are now out of sync and try again
# later
logger.warning("Failed to handle device list update for %s", user_id)
# We abort on exceptions rather than accepting the update
# as otherwise synapse will 'forget' that its device list
# is out of date. If we bail then we will retry the resync
# next time we get a device list update for this user_id.
# This makes it more likely that the device lists will
# eventually become consistent.
return
except FederationDeniedError as e:
set_tag("error", True)
log_kv({"reason": "FederationDeniedError"})
logger.info(e)
return
except Exception as e:
# TODO: Remember that we are now out of sync and try again
# later
set_tag("error", True)
log_kv(
{"message": "Exception raised by federation request", "exception": e}
)
logger.exception("Failed to handle device list update for %s", user_id)
return
log_kv({"result": result})
stream_id = result["stream_id"]
devices = result["devices"]
# If the remote server has more than ~1000 devices for this user
# we assume that something is going horribly wrong (e.g. a bot
# that logs in and creates a new device every time it tries to
# send a message). Maintaining lots of devices per user in the
# cache can cause serious performance issues as if this request
# takes more than 60s to complete, internal replication from the
# inbound federation worker to the synapse master may time out
# causing the inbound federation to fail and causing the remote
# server to retry, causing a DoS. So in this scenario we give
# up on storing the total list of devices and only handle the
# delta instead.
if len(devices) > 1000:
logger.warning(
"Ignoring device list snapshot for %s as it has >1K devs (%d)",
user_id,
len(devices),
)
devices = []
for device in devices:
logger.debug(
"Handling resync update %r/%r, ID: %r",
user_id,
device["device_id"],
stream_id,
)
yield self.store.update_remote_device_list_cache(user_id, devices, stream_id)
device_ids = [device["device_id"] for device in devices]
yield self.device_handler.notify_device_update(user_id, device_ids)
# We clobber the seen updates since we've re-synced from a given
# point.
self._seen_updates[user_id] = {stream_id}
defer.returnValue(result)
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