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Add support for MSC2697: Dehydrated devices (#8380)

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This allows a user to store an offline device on the server and
then restore it at a subsequent login.
This commit is contained in:
Hubert Chathi 2020-10-07 08:00:17 -04:00 committed by GitHub
parent 43c622885c
commit 4cb44a1585
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9 changed files with 454 additions and 21 deletions
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1
changelog.d/8380.feature Normal file
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@ -0,0 +1 @@
Add support for device dehydration ([MSC2697](https://github.com/matrix-org/matrix-doc/pull/2697)).

84
synapse/handlers/device.py
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@ -1,7 +1,7 @@
# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
# Copyright 2019 New Vector Ltd
# Copyright 2019 The Matrix.org Foundation C.I.C.
# Copyright 2019,2020 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.
@ -15,7 +15,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from typing import Any, Dict, List, Optional
from typing import Any, Dict, List, Optional, Tuple
from synapse.api import errors
from synapse.api.constants import EventTypes
@ -29,6 +29,7 @@ from synapse.api.errors import (
from synapse.logging.opentracing import log_kv, set_tag, trace
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.types import (
JsonDict,
StreamToken,
get_domain_from_id,
get_verify_key_from_cross_signing_key,
@ -505,6 +506,85 @@ class DeviceHandler(DeviceWorkerHandler):
# receive device updates. Mark this in DB.
await self.store.mark_remote_user_device_list_as_unsubscribed(user_id)
async def store_dehydrated_device(
self,
user_id: str,
device_data: JsonDict,
initial_device_display_name: Optional[str] = None,
) -> str:
"""Store a dehydrated device for a user. If the user had a previous
dehydrated device, it is removed.
Args:
user_id: the user that we are storing the device for
device_data: the dehydrated device information
initial_device_display_name: The display name to use for the device
Returns:
device id of the dehydrated device
"""
device_id = await self.check_device_registered(
user_id, None, initial_device_display_name,
)
old_device_id = await self.store.store_dehydrated_device(
user_id, device_id, device_data
)
if old_device_id is not None:
await self.delete_device(user_id, old_device_id)
return device_id
async def get_dehydrated_device(
self, user_id: str
) -> Optional[Tuple[str, JsonDict]]:
"""Retrieve the information for a dehydrated device.
Args:
user_id: the user whose dehydrated device we are looking for
Returns:
a tuple whose first item is the device ID, and the second item is
the dehydrated device information
"""
return await self.store.get_dehydrated_device(user_id)
async def rehydrate_device(
self, user_id: str, access_token: str, device_id: str
) -> dict:
"""Process a rehydration request from the user.
Args:
user_id: the user who is rehydrating the device
access_token: the access token used for the request
device_id: the ID of the device that will be rehydrated
Returns:
a dict containing {"success": True}
"""
success = await self.store.remove_dehydrated_device(user_id, device_id)
if not success:
raise errors.NotFoundError()
# If the dehydrated device was successfully deleted (the device ID
# matched the stored dehydrated device), then modify the access
# token to use the dehydrated device's ID and copy the old device
# display name to the dehydrated device, and destroy the old device
# ID
old_device_id = await self.store.set_device_for_access_token(
access_token, device_id
)
old_device = await self.store.get_device(user_id, old_device_id)
await self.store.update_device(user_id, device_id, old_device["display_name"])
# can't call self.delete_device because that will clobber the
# access token so call the storage layer directly
await self.store.delete_device(user_id, old_device_id)
await self.store.delete_e2e_keys_by_device(
user_id=user_id, device_id=old_device_id
)
# tell everyone that the old device is gone and that the dehydrated
# device has a new display name
await self.notify_device_update(user_id, [old_device_id, device_id])
return {"success": True}
def _update_device_from_client_ips(device, client_ips):
ip = client_ips.get((device["user_id"], device["device_id"]), {})

134
synapse/rest/client/v2_alpha/devices.py
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@ -1,5 +1,6 @@
# -*- coding: utf-8 -*-
# Copyright 2015, 2016 OpenMarket Ltd
# Copyright 2020 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.
@ -21,6 +22,7 @@ from synapse.http.servlet import (
assert_params_in_dict,
parse_json_object_from_request,
)
from synapse.http.site import SynapseRequest
from ._base import client_patterns, interactive_auth_handler
@ -151,7 +153,139 @@ class DeviceRestServlet(RestServlet):
return 200, {}
class DehydratedDeviceServlet(RestServlet):
"""Retrieve or store a dehydrated device.
GET /org.matrix.msc2697.v2/dehydrated_device
HTTP/1.1 200 OK
Content-Type: application/json
{
"device_id": "dehydrated_device_id",
"device_data": {
"algorithm": "org.matrix.msc2697.v1.dehydration.v1.olm",
"account": "dehydrated_device"
}
}
PUT /org.matrix.msc2697/dehydrated_device
Content-Type: application/json
{
"device_data": {
"algorithm": "org.matrix.msc2697.v1.dehydration.v1.olm",
"account": "dehydrated_device"
}
}
HTTP/1.1 200 OK
Content-Type: application/json
{
"device_id": "dehydrated_device_id"
}
"""
PATTERNS = client_patterns("/org.matrix.msc2697.v2/dehydrated_device", releases=())
def __init__(self, hs):
super().__init__()
self.hs = hs
self.auth = hs.get_auth()
self.device_handler = hs.get_device_handler()
async def on_GET(self, request: SynapseRequest):
requester = await self.auth.get_user_by_req(request)
dehydrated_device = await self.device_handler.get_dehydrated_device(
requester.user.to_string()
)
if dehydrated_device is not None:
(device_id, device_data) = dehydrated_device
result = {"device_id": device_id, "device_data": device_data}
return (200, result)
else:
raise errors.NotFoundError("No dehydrated device available")
async def on_PUT(self, request: SynapseRequest):
submission = parse_json_object_from_request(request)
requester = await self.auth.get_user_by_req(request)
if "device_data" not in submission:
raise errors.SynapseError(
400, "device_data missing", errcode=errors.Codes.MISSING_PARAM,
)
elif not isinstance(submission["device_data"], dict):
raise errors.SynapseError(
400,
"device_data must be an object",
errcode=errors.Codes.INVALID_PARAM,
)
device_id = await self.device_handler.store_dehydrated_device(
requester.user.to_string(),
submission["device_data"],
submission.get("initial_device_display_name", None),
)
return 200, {"device_id": device_id}
class ClaimDehydratedDeviceServlet(RestServlet):
"""Claim a dehydrated device.
POST /org.matrix.msc2697.v2/dehydrated_device/claim
Content-Type: application/json
{
"device_id": "dehydrated_device_id"
}
HTTP/1.1 200 OK
Content-Type: application/json
{
"success": true,
}
"""
PATTERNS = client_patterns(
"/org.matrix.msc2697.v2/dehydrated_device/claim", releases=()
)
def __init__(self, hs):
super().__init__()
self.hs = hs
self.auth = hs.get_auth()
self.device_handler = hs.get_device_handler()
async def on_POST(self, request: SynapseRequest):
requester = await self.auth.get_user_by_req(request)
submission = parse_json_object_from_request(request)
if "device_id" not in submission:
raise errors.SynapseError(
400, "device_id missing", errcode=errors.Codes.MISSING_PARAM,
)
elif not isinstance(submission["device_id"], str):
raise errors.SynapseError(
400, "device_id must be a string", errcode=errors.Codes.INVALID_PARAM,
)
result = await self.device_handler.rehydrate_device(
requester.user.to_string(),
self.auth.get_access_token_from_request(request),
submission["device_id"],
)
return (200, result)
def register_servlets(hs, http_server):
DeleteDevicesRestServlet(hs).register(http_server)
DevicesRestServlet(hs).register(http_server)
DeviceRestServlet(hs).register(http_server)
DehydratedDeviceServlet(hs).register(http_server)
ClaimDehydratedDeviceServlet(hs).register(http_server)

11
synapse/rest/client/v2_alpha/keys.py
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@ -1,6 +1,7 @@
# -*- coding: utf-8 -*-
# Copyright 2015, 2016 OpenMarket Ltd
# Copyright 2019 New Vector Ltd
# Copyright 2020 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.
@ -67,6 +68,7 @@ class KeyUploadServlet(RestServlet):
super().__init__()
self.auth = hs.get_auth()
self.e2e_keys_handler = hs.get_e2e_keys_handler()
self.device_handler = hs.get_device_handler()
@trace(opname="upload_keys")
async def on_POST(self, request, device_id):
@ -75,9 +77,14 @@ class KeyUploadServlet(RestServlet):
body = parse_json_object_from_request(request)
if device_id is not None:
# passing the device_id here is deprecated; however, we allow it
# for now for compatibility with older clients.
# Providing the device_id should only be done for setting keys
# for dehydrated devices; however, we allow it for any device for
# compatibility with older clients.
if requester.device_id is not None and device_id != requester.device_id:
dehydrated_device = await self.device_handler.get_dehydrated_device(
user_id
)
if dehydrated_device is not None and device_id != dehydrated_device[0]:
set_tag("error", True)
log_kv(
{

78
synapse/storage/databases/main/devices.py
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@ -1,7 +1,7 @@
# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
# Copyright 2019 New Vector Ltd
# Copyright 2019 The Matrix.org Foundation C.I.C.
# Copyright 2019,2020 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.
@ -33,7 +33,7 @@ from synapse.storage.database import (
make_tuple_comparison_clause,
)
from synapse.types import Collection, JsonDict, get_verify_key_from_cross_signing_key
from synapse.util import json_encoder
from synapse.util import json_decoder, json_encoder
from synapse.util.caches.descriptors import Cache, cached, cachedList
from synapse.util.iterutils import batch_iter
from synapse.util.stringutils import shortstr
@ -698,6 +698,80 @@ class DeviceWorkerStore(SQLBaseStore):
_mark_remote_user_device_list_as_unsubscribed_txn,
)
async def get_dehydrated_device(
self, user_id: str
) -> Optional[Tuple[str, JsonDict]]:
"""Retrieve the information for a dehydrated device.
Args:
user_id: the user whose dehydrated device we are looking for
Returns:
a tuple whose first item is the device ID, and the second item is
the dehydrated device information
"""
# FIXME: make sure device ID still exists in devices table
row = await self.db_pool.simple_select_one(
table="dehydrated_devices",
keyvalues={"user_id": user_id},
retcols=["device_id", "device_data"],
allow_none=True,
)
return (
(row["device_id"], json_decoder.decode(row["device_data"])) if row else None
)
def _store_dehydrated_device_txn(
self, txn, user_id: str, device_id: str, device_data: str
) -> Optional[str]:
old_device_id = self.db_pool.simple_select_one_onecol_txn(
txn,
table="dehydrated_devices",
keyvalues={"user_id": user_id},
retcol="device_id",
allow_none=True,
)
self.db_pool.simple_upsert_txn(
txn,
table="dehydrated_devices",
keyvalues={"user_id": user_id},
values={"device_id": device_id, "device_data": device_data},
)
return old_device_id
async def store_dehydrated_device(
self, user_id: str, device_id: str, device_data: JsonDict
) -> Optional[str]:
"""Store a dehydrated device for a user.
Args:
user_id: the user that we are storing the device for
device_id: the ID of the dehydrated device
device_data: the dehydrated device information
Returns:
device id of the user's previous dehydrated device, if any
"""
return await self.db_pool.runInteraction(
"store_dehydrated_device_txn",
self._store_dehydrated_device_txn,
user_id,
device_id,
json_encoder.encode(device_data),
)
async def remove_dehydrated_device(self, user_id: str, device_id: str) -> bool:
"""Remove a dehydrated device.
Args:
user_id: the user that the dehydrated device belongs to
device_id: the ID of the dehydrated device
"""
count = await self.db_pool.simple_delete(
"dehydrated_devices",
{"user_id": user_id, "device_id": device_id},
desc="remove_dehydrated_device",
)
return count >= 1
class DeviceBackgroundUpdateStore(SQLBaseStore):
def __init__(self, database: DatabasePool, db_conn, hs):

7
synapse/storage/databases/main/end_to_end_keys.py
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@ -1,7 +1,7 @@
# -*- coding: utf-8 -*-
# Copyright 2015, 2016 OpenMarket Ltd
# Copyright 2019 New Vector Ltd
# Copyright 2019 The Matrix.org Foundation C.I.C.
# Copyright 2019,2020 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.
@ -844,6 +844,11 @@ class EndToEndKeyStore(EndToEndKeyWorkerStore, SQLBaseStore):
self._invalidate_cache_and_stream(
txn, self.count_e2e_one_time_keys, (user_id, device_id)
)
self.db_pool.simple_delete_txn(
txn,
table="dehydrated_devices",
keyvalues={"user_id": user_id, "device_id": device_id},
)
self.db_pool.simple_delete_txn(
txn,
table="e2e_fallback_keys_json",

32
synapse/storage/databases/main/registration.py
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@ -1,7 +1,7 @@
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2017-2018 New Vector Ltd
# Copyright 2019 The Matrix.org Foundation C.I.C.
# Copyright 2019,2020 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.
@ -964,6 +964,36 @@ class RegistrationStore(RegistrationBackgroundUpdateStore):
desc="add_access_token_to_user",
)
def _set_device_for_access_token_txn(self, txn, token: str, device_id: str) -> str:
old_device_id = self.db_pool.simple_select_one_onecol_txn(
txn, "access_tokens", {"token": token}, "device_id"
)
self.db_pool.simple_update_txn(
txn, "access_tokens", {"token": token}, {"device_id": device_id}
)
self._invalidate_cache_and_stream(txn, self.get_user_by_access_token, (token,))
return old_device_id
async def set_device_for_access_token(self, token: str, device_id: str) -> str:
"""Sets the device ID associated with an access token.
Args:
token: The access token to modify.
device_id: The new device ID.
Returns:
The old device ID associated with the access token.
"""
return await self.db_pool.runInteraction(
"set_device_for_access_token",
self._set_device_for_access_token_txn,
token,
device_id,
)
async def register_user(
self,
user_id: str,

20
synapse/storage/databases/main/schema/delta/58/11dehydration.sql Normal file
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@ -0,0 +1,20 @@
/* Copyright 2020 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.
*/
CREATE TABLE IF NOT EXISTS dehydrated_devices(
user_id TEXT NOT NULL PRIMARY KEY,
device_id TEXT NOT NULL,
device_data TEXT NOT NULL -- JSON-encoded client-defined data
);

82
tests/handlers/test_device.py
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@ -1,6 +1,7 @@
# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
# Copyright 2020 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.
@ -224,3 +225,84 @@ class DeviceTestCase(unittest.HomeserverTestCase):
)
)
self.reactor.advance(1000)
class DehydrationTestCase(unittest.HomeserverTestCase):
def make_homeserver(self, reactor, clock):
hs = self.setup_test_homeserver("server", http_client=None)
self.handler = hs.get_device_handler()
self.registration = hs.get_registration_handler()
self.auth = hs.get_auth()
self.store = hs.get_datastore()
return hs
def test_dehydrate_and_rehydrate_device(self):
user_id = "@boris:dehydration"
self.get_success(self.store.register_user(user_id, "foobar"))
# First check if we can store and fetch a dehydrated device
stored_dehydrated_device_id = self.get_success(
self.handler.store_dehydrated_device(
user_id=user_id,
device_data={"device_data": {"foo": "bar"}},
initial_device_display_name="dehydrated device",
)
)
retrieved_device_id, device_data = self.get_success(
self.handler.get_dehydrated_device(user_id=user_id)
)
self.assertEqual(retrieved_device_id, stored_dehydrated_device_id)
self.assertEqual(device_data, {"device_data": {"foo": "bar"}})
# Create a new login for the user and dehydrated the device
device_id, access_token = self.get_success(
self.registration.register_device(
user_id=user_id, device_id=None, initial_display_name="new device",
)
)
# Trying to claim a nonexistent device should throw an error
self.get_failure(
self.handler.rehydrate_device(
user_id=user_id,
access_token=access_token,
device_id="not the right device ID",
),
synapse.api.errors.NotFoundError,
)
# dehydrating the right devices should succeed and change our device ID
# to the dehydrated device's ID
res = self.get_success(
self.handler.rehydrate_device(
user_id=user_id,
access_token=access_token,
device_id=retrieved_device_id,
)
)
self.assertEqual(res, {"success": True})
# make sure that our device ID has changed
user_info = self.get_success(self.auth.get_user_by_access_token(access_token))
self.assertEqual(user_info["device_id"], retrieved_device_id)
# make sure the device has the display name that was set from the login
res = self.get_success(self.handler.get_device(user_id, retrieved_device_id))
self.assertEqual(res["display_name"], "new device")
# make sure that the device ID that we were initially assigned no longer exists
self.get_failure(
self.handler.get_device(user_id, device_id),
synapse.api.errors.NotFoundError,
)
# make sure that there's no device available for dehydrating now
ret = self.get_success(self.handler.get_dehydrated_device(user_id=user_id))
self.assertIsNone(ret)