diff --git a/changelog.d/15629.feature b/changelog.d/15629.feature new file mode 100644 index 000000000000..16264effca57 --- /dev/null +++ b/changelog.d/15629.feature @@ -0,0 +1 @@ +Scope transaction IDs to devices (implement [MSC3970](https://github.com/matrix-org/matrix-spec-proposals/pull/3970)). diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py index 1695ed8ca336..ac9449b18f70 100644 --- a/synapse/config/experimental.py +++ b/synapse/config/experimental.py @@ -216,12 +216,6 @@ def check_config_conflicts(self, root: RootConfig) -> None: ("session_lifetime",), ) - if not root.experimental.msc3970_enabled: - raise ConfigError( - "experimental_features.msc3970_enabled must be 'true' when OAuth delegation is enabled", - ("experimental_features", "msc3970_enabled"), - ) - @attr.s(auto_attribs=True, frozen=True, slots=True) class MSC3866Config: @@ -397,9 +391,6 @@ def read_config(self, config: JsonDict, **kwargs: Any) -> None: "Invalid MSC3861 configuration", ("experimental", "msc3861") ) from exc - # MSC3970: Scope transaction IDs to devices - self.msc3970_enabled = experimental.get("msc3970_enabled", self.msc3861.enabled) - # Check that none of the other config options conflict with MSC3861 when enabled self.msc3861.check_config_conflicts(self.root) diff --git a/synapse/events/utils.py b/synapse/events/utils.py index c890833b1d1e..ebd2d141004b 100644 --- a/synapse/events/utils.py +++ b/synapse/events/utils.py @@ -394,7 +394,6 @@ def serialize_event( time_now_ms: int, *, config: SerializeEventConfig = _DEFAULT_SERIALIZE_EVENT_CONFIG, - msc3970_enabled: bool = False, ) -> JsonDict: """Serialize event for clients @@ -402,8 +401,6 @@ def serialize_event( e time_now_ms config: Event serialization config - msc3970_enabled: Whether MSC3970 is enabled. It changes whether we should - include the `transaction_id` in the event's `unsigned` section. Returns: The serialized event dictionary. @@ -429,38 +426,46 @@ def serialize_event( e.unsigned["redacted_because"], time_now_ms, config=config, - msc3970_enabled=msc3970_enabled, ) # If we have a txn_id saved in the internal_metadata, we should include it in the # unsigned section of the event if it was sent by the same session as the one # requesting the event. txn_id: Optional[str] = getattr(e.internal_metadata, "txn_id", None) - if txn_id is not None and config.requester is not None: - # For the MSC3970 rules to be applied, we *need* to have the device ID in the - # event internal metadata. Since we were not recording them before, if it hasn't - # been recorded, we fallback to the old behaviour. + if ( + txn_id is not None + and config.requester is not None + and config.requester.user.to_string() == e.sender + ): + # Some events do not have the device ID stored in the internal metadata, + # this includes old events as well as those created by appservice, guests, + # or with tokens minted with the admin API. For those events, fallback + # to using the access token instead. event_device_id: Optional[str] = getattr(e.internal_metadata, "device_id", None) - if msc3970_enabled and event_device_id is not None: + if event_device_id is not None: if event_device_id == config.requester.device_id: d["unsigned"]["transaction_id"] = txn_id else: - # The pre-MSC3970 behaviour is to only include the transaction ID if the - # event was sent from the same access token. For regular users, we can use - # the access token ID to determine this. For guests, we can't, but since - # each guest only has one access token, we can just check that the event was - # sent by the same user as the one requesting the event. + # Fallback behaviour: only include the transaction ID if the event + # was sent from the same access token. + # + # For regular users, the access token ID can be used to determine this. + # This includes access tokens minted with the admin API. + # + # For guests and appservice users, we can't check the access token ID + # so assume it is the same session. event_token_id: Optional[int] = getattr( e.internal_metadata, "token_id", None ) - if config.requester.user.to_string() == e.sender and ( + if ( ( event_token_id is not None and config.requester.access_token_id is not None and event_token_id == config.requester.access_token_id ) or config.requester.is_guest + or config.requester.app_service ): d["unsigned"]["transaction_id"] = txn_id @@ -502,9 +507,6 @@ class EventClientSerializer: clients. """ - def __init__(self, *, msc3970_enabled: bool = False): - self._msc3970_enabled = msc3970_enabled - def serialize_event( self, event: Union[JsonDict, EventBase], @@ -529,9 +531,7 @@ def serialize_event( if not isinstance(event, EventBase): return event - serialized_event = serialize_event( - event, time_now, config=config, msc3970_enabled=self._msc3970_enabled - ) + serialized_event = serialize_event(event, time_now, config=config) # Check if there are any bundled aggregations to include with the event. if bundle_aggregations: diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py index c656e07d37f8..d485f21e49f1 100644 --- a/synapse/handlers/message.py +++ b/synapse/handlers/message.py @@ -561,8 +561,6 @@ def __init__(self, hs: "HomeServer"): expiry_ms=30 * 60 * 1000, ) - self._msc3970_enabled = hs.config.experimental.msc3970_enabled - async def create_event( self, requester: Requester, @@ -897,9 +895,8 @@ async def get_event_id_from_transaction( """ existing_event_id = None - if self._msc3970_enabled and requester.device_id: - # When MSC3970 is enabled, we lookup for events sent by the same device first, - # and fallback to the old behaviour if none were found. + # According to the spec, transactions are scoped to a user's device ID. + if requester.device_id: existing_event_id = ( await self.store.get_event_id_from_transaction_id_and_device_id( room_id, @@ -911,8 +908,9 @@ async def get_event_id_from_transaction( if existing_event_id: return existing_event_id - # Pre-MSC3970, we looked up for events that were sent by the same session by - # using the access token ID. + # Some requsters don't have device IDs (appservice, guests, and access + # tokens minted with the admin API), fallback to checking the access token + # ID, which should be close enough. if requester.access_token_id: existing_event_id = ( await self.store.get_event_id_from_transaction_id_and_token_id( diff --git a/synapse/rest/client/transactions.py b/synapse/rest/client/transactions.py index 0d8a63d8beda..3d814c404d98 100644 --- a/synapse/rest/client/transactions.py +++ b/synapse/rest/client/transactions.py @@ -50,8 +50,6 @@ def __init__(self, hs: "HomeServer"): # for at *LEAST* 30 mins, and at *MOST* 60 mins. self.cleaner = self.clock.looping_call(self._cleanup, CLEANUP_PERIOD_MS) - self._msc3970_enabled = hs.config.experimental.msc3970_enabled - def _get_transaction_key(self, request: IRequest, requester: Requester) -> Hashable: """A helper function which returns a transaction key that can be used with TransactionCache for idempotent requests. @@ -78,18 +76,20 @@ def _get_transaction_key(self, request: IRequest, requester: Requester) -> Hasha elif requester.app_service is not None: return (path, "appservice", requester.app_service.id) - # With MSC3970, we use the user ID and device ID as the transaction key - elif self._msc3970_enabled: + # Use the user ID and device ID as the transaction key. + elif requester.device_id: assert requester.user, "Requester must have a user" assert requester.device_id, "Requester must have a device_id" return (path, "user", requester.user, requester.device_id) - # Otherwise, the pre-MSC3970 behaviour is to use the access token ID + # Some requsters don't have device IDs, these are mostly handled above + # (appservice and guest users), but does not cover access tokens minted + # by the admin API. Use the access token ID instead. else: assert ( requester.access_token_id is not None ), "Requester must have an access_token_id" - return (path, "user", requester.access_token_id) + return (path, "user_admin", requester.access_token_id) def fetch_or_execute_request( self, diff --git a/synapse/server.py b/synapse/server.py index 8430f99ef254..e753ff0377d1 100644 --- a/synapse/server.py +++ b/synapse/server.py @@ -785,9 +785,7 @@ def get_oidc_handler(self) -> "OidcHandler": @cache_in_self def get_event_client_serializer(self) -> EventClientSerializer: - return EventClientSerializer( - msc3970_enabled=self.config.experimental.msc3970_enabled - ) + return EventClientSerializer() @cache_in_self def get_password_policy_handler(self) -> PasswordPolicyHandler: diff --git a/synapse/storage/databases/main/events.py b/synapse/storage/databases/main/events.py index bd3f14fb7126..c1353b18c1cd 100644 --- a/synapse/storage/databases/main/events.py +++ b/synapse/storage/databases/main/events.py @@ -127,8 +127,6 @@ def __init__( self._backfill_id_gen: AbstractStreamIdGenerator = self.store._backfill_id_gen self._stream_id_gen: AbstractStreamIdGenerator = self.store._stream_id_gen - self._msc3970_enabled = hs.config.experimental.msc3970_enabled - @trace async def _persist_events_and_state_updates( self, @@ -1012,9 +1010,11 @@ def _persist_transaction_ids_txn( ) ) - # Pre-MSC3970, we rely on the access_token_id to scope the txn_id for events. - # Since this is an experimental flag, we still store the mapping even if the - # flag is disabled. + # Synapse usually relies on the device_id to scope transactions for events, + # except for users without device IDs (appservice, guests, and access + # tokens minted with the admin API) which use the access token ID instead. + # + # TODO https://github.com/matrix-org/synapse/issues/16042 if to_insert_token_id: self.db_pool.simple_insert_many_txn( txn, @@ -1030,10 +1030,7 @@ def _persist_transaction_ids_txn( values=to_insert_token_id, ) - # With MSC3970, we rely on the device_id instead to scope the txn_id for events. - # We're only inserting if MSC3970 is *enabled*, because else the pre-MSC3970 - # behaviour would allow for a UNIQUE constraint violation on this table - if to_insert_device_id and self._msc3970_enabled: + if to_insert_device_id: self.db_pool.simple_insert_many_txn( txn, table="event_txn_id_device_id", diff --git a/synapse/storage/schema/__init__.py b/synapse/storage/schema/__init__.py index d3ec648f6d0f..7de9949a5b7f 100644 --- a/synapse/storage/schema/__init__.py +++ b/synapse/storage/schema/__init__.py @@ -12,7 +12,7 @@ # See the License for the specific language governing permissions and # limitations under the License. -SCHEMA_VERSION = 79 # remember to update the list below when updating +SCHEMA_VERSION = 80 # remember to update the list below when updating """Represents the expectations made by the codebase about the database schema This should be incremented whenever the codebase changes its requirements on the @@ -110,6 +110,9 @@ Changes in SCHEMA_VERSION = 79 - Add tables to handle in DB read-write locks. - Add some mitigations for a painful race between foreground and background updates, cf #15677. + +Changes in SCHEMA_VERSION = 80 + - The event_txn_id_device_id is always written to for new events. """ diff --git a/synapse/types/__init__.py b/synapse/types/__init__.py index fdfd465c8dea..39a1ae4ac347 100644 --- a/synapse/types/__init__.py +++ b/synapse/types/__init__.py @@ -117,11 +117,12 @@ class Requester: Attributes: user: id of the user making the request - access_token_id: *ID* of the access token used for this - request, or None if it came via the appservice API or similar + access_token_id: *ID* of the access token used for this request, or + None for appservices, guests, and tokens generated by the admin API is_guest: True if the user making this request is a guest user shadow_banned: True if the user making this request has been shadow-banned. - device_id: device_id which was set at authentication time + device_id: device_id which was set at authentication time, or + None for appservices, guests, and tokens generated by the admin API app_service: the AS requesting on behalf of the user authenticated_entity: The entity that authenticated when making the request. This is different to the user_id when an admin user or the server is