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Implement MSC3848: Introduce errcodes for specific event sending failures (#13343)

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Implements MSC3848
This commit is contained in:
Will Hunt 2022-07-27 13:44:40 +01:00 committed by GitHub
parent 39be5bc550
commit 502f075e96
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GPG key ID: 4AEE18F83AFDEB23
11 changed files with 144 additions and 36 deletions
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1
changelog.d/13343.feature Normal file
View file

@ -0,0 +1 @@
Add new unstable error codes `ORG.MATRIX.MSC3848.ALREADY_JOINED`, `ORG.MATRIX.MSC3848.NOT_JOINED`, and `ORG.MATRIX.MSC3848.INSUFFICIENT_POWER` described in MSC3848.

11
synapse/api/auth.py
View file

@ -26,6 +26,7 @@ from synapse.api.errors import (
Codes,
InvalidClientTokenError,
MissingClientTokenError,
UnstableSpecAuthError,
)
from synapse.appservice import ApplicationService
from synapse.http import get_request_user_agent
@ -106,8 +107,11 @@ class Auth:
forgot = await self.store.did_forget(user_id, room_id)
if not forgot:
return membership, member_event_id
raise AuthError(403, "User %s not in room %s" % (user_id, room_id))
raise UnstableSpecAuthError(
403,
"User %s not in room %s" % (user_id, room_id),
errcode=Codes.NOT_JOINED,
)
async def get_user_by_req(
self,
@ -600,8 +604,9 @@ class Auth:
== HistoryVisibility.WORLD_READABLE
):
return Membership.JOIN, None
raise AuthError(
raise UnstableSpecAuthError(
403,
"User %s not in room %s, and room previews are disabled"
% (user_id, room_id),
errcode=Codes.NOT_JOINED,
)

58
synapse/api/errors.py
View file

@ -26,6 +26,7 @@ from twisted.web import http
from synapse.util import json_decoder
if typing.TYPE_CHECKING:
from synapse.config.homeserver import HomeServerConfig
from synapse.types import JsonDict
logger = logging.getLogger(__name__)
@ -80,6 +81,12 @@ class Codes(str, Enum):
INVALID_SIGNATURE = "M_INVALID_SIGNATURE"
USER_DEACTIVATED = "M_USER_DEACTIVATED"
# Part of MSC3848
# https://github.com/matrix-org/matrix-spec-proposals/pull/3848
ALREADY_JOINED = "ORG.MATRIX.MSC3848.ALREADY_JOINED"
NOT_JOINED = "ORG.MATRIX.MSC3848.NOT_JOINED"
INSUFFICIENT_POWER = "ORG.MATRIX.MSC3848.INSUFFICIENT_POWER"
# The account has been suspended on the server.
# By opposition to `USER_DEACTIVATED`, this is a reversible measure
# that can possibly be appealed and reverted.
@ -167,7 +174,7 @@ class SynapseError(CodeMessageException):
else:
self._additional_fields = dict(additional_fields)
def error_dict(self) -> "JsonDict":
def error_dict(self, config: Optional["HomeServerConfig"]) -> "JsonDict":
return cs_error(self.msg, self.errcode, **self._additional_fields)
@ -213,7 +220,7 @@ class ConsentNotGivenError(SynapseError):
)
self._consent_uri = consent_uri
def error_dict(self) -> "JsonDict":
def error_dict(self, config: Optional["HomeServerConfig"]) -> "JsonDict":
return cs_error(self.msg, self.errcode, consent_uri=self._consent_uri)
@ -307,6 +314,37 @@ class AuthError(SynapseError):
super().__init__(code, msg, errcode, additional_fields)
class UnstableSpecAuthError(AuthError):
"""An error raised when a new error code is being proposed to replace a previous one.
This error will return a "org.matrix.unstable.errcode" property with the new error code,
with the previous error code still being defined in the "errcode" property.
This error will include `org.matrix.msc3848.unstable.errcode` in the C-S error body.
"""
def __init__(
self,
code: int,
msg: str,
errcode: str,
previous_errcode: str = Codes.FORBIDDEN,
additional_fields: Optional[dict] = None,
):
self.previous_errcode = previous_errcode
super().__init__(code, msg, errcode, additional_fields)
def error_dict(self, config: Optional["HomeServerConfig"]) -> "JsonDict":
fields = {}
if config is not None and config.experimental.msc3848_enabled:
fields["org.matrix.msc3848.unstable.errcode"] = self.errcode
return cs_error(
self.msg,
self.previous_errcode,
**fields,
**self._additional_fields,
)
class InvalidClientCredentialsError(SynapseError):
"""An error raised when there was a problem with the authorisation credentials
in a client request.
@ -338,8 +376,8 @@ class InvalidClientTokenError(InvalidClientCredentialsError):
super().__init__(msg=msg, errcode="M_UNKNOWN_TOKEN")
self._soft_logout = soft_logout
def error_dict(self) -> "JsonDict":
d = super().error_dict()
def error_dict(self, config: Optional["HomeServerConfig"]) -> "JsonDict":
d = super().error_dict(config)
d["soft_logout"] = self._soft_logout
return d
@ -362,7 +400,7 @@ class ResourceLimitError(SynapseError):
self.limit_type = limit_type
super().__init__(code, msg, errcode=errcode)
def error_dict(self) -> "JsonDict":
def error_dict(self, config: Optional["HomeServerConfig"]) -> "JsonDict":
return cs_error(
self.msg,
self.errcode,
@ -397,7 +435,7 @@ class InvalidCaptchaError(SynapseError):
super().__init__(code, msg, errcode)
self.error_url = error_url
def error_dict(self) -> "JsonDict":
def error_dict(self, config: Optional["HomeServerConfig"]) -> "JsonDict":
return cs_error(self.msg, self.errcode, error_url=self.error_url)
@ -414,7 +452,7 @@ class LimitExceededError(SynapseError):
super().__init__(code, msg, errcode)
self.retry_after_ms = retry_after_ms
def error_dict(self) -> "JsonDict":
def error_dict(self, config: Optional["HomeServerConfig"]) -> "JsonDict":
return cs_error(self.msg, self.errcode, retry_after_ms=self.retry_after_ms)
@ -429,7 +467,7 @@ class RoomKeysVersionError(SynapseError):
super().__init__(403, "Wrong room_keys version", Codes.WRONG_ROOM_KEYS_VERSION)
self.current_version = current_version
def error_dict(self) -> "JsonDict":
def error_dict(self, config: Optional["HomeServerConfig"]) -> "JsonDict":
return cs_error(self.msg, self.errcode, current_version=self.current_version)
@ -469,7 +507,7 @@ class IncompatibleRoomVersionError(SynapseError):
self._room_version = room_version
def error_dict(self) -> "JsonDict":
def error_dict(self, config: Optional["HomeServerConfig"]) -> "JsonDict":
return cs_error(self.msg, self.errcode, room_version=self._room_version)
@ -515,7 +553,7 @@ class UnredactedContentDeletedError(SynapseError):
)
self.content_keep_ms = content_keep_ms
def error_dict(self) -> "JsonDict":
def error_dict(self, config: Optional["HomeServerConfig"]) -> "JsonDict":
extra = {}
if self.content_keep_ms is not None:
extra = {"fi.mau.msc2815.content_keep_ms": self.content_keep_ms}

3
synapse/config/experimental.py
View file

@ -90,3 +90,6 @@ class ExperimentalConfig(Config):
# MSC3827: Filtering of /publicRooms by room type
self.msc3827_enabled: bool = experimental.get("msc3827_enabled", False)
# MSC3848: Introduce errcodes for specific event sending failures
self.msc3848_enabled: bool = experimental.get("msc3848_enabled", False)

62
synapse/event_auth.py
View file

@ -30,7 +30,13 @@ from synapse.api.constants import (
JoinRules,
Membership,
)
from synapse.api.errors import AuthError, EventSizeError, SynapseError
from synapse.api.errors import (
AuthError,
Codes,
EventSizeError,
SynapseError,
UnstableSpecAuthError,
)
from synapse.api.room_versions import (
KNOWN_ROOM_VERSIONS,
EventFormatVersions,
@ -291,7 +297,11 @@ def check_state_dependent_auth_rules(
invite_level = get_named_level(auth_dict, "invite", 0)
if user_level < invite_level:
raise AuthError(403, "You don't have permission to invite users")
raise UnstableSpecAuthError(
403,
"You don't have permission to invite users",
errcode=Codes.INSUFFICIENT_POWER,
)
else:
logger.debug("Allowing! %s", event)
return
@ -474,7 +484,11 @@ def _is_membership_change_allowed(
return
if not caller_in_room: # caller isn't joined
raise AuthError(403, "%s not in room %s." % (event.user_id, event.room_id))
raise UnstableSpecAuthError(
403,
"%s not in room %s." % (event.user_id, event.room_id),
errcode=Codes.NOT_JOINED,
)
if Membership.INVITE == membership:
# TODO (erikj): We should probably handle this more intelligently
@ -484,10 +498,18 @@ def _is_membership_change_allowed(
if target_banned:
raise AuthError(403, "%s is banned from the room" % (target_user_id,))
elif target_in_room: # the target is already in the room.
raise AuthError(403, "%s is already in the room." % target_user_id)
raise UnstableSpecAuthError(
403,
"%s is already in the room." % target_user_id,
errcode=Codes.ALREADY_JOINED,
)
else:
if user_level < invite_level:
raise AuthError(403, "You don't have permission to invite users")
raise UnstableSpecAuthError(
403,
"You don't have permission to invite users",
errcode=Codes.INSUFFICIENT_POWER,
)
elif Membership.JOIN == membership:
# Joins are valid iff caller == target and:
# * They are not banned.
@ -549,15 +571,27 @@ def _is_membership_change_allowed(
elif Membership.LEAVE == membership:
# TODO (erikj): Implement kicks.
if target_banned and user_level < ban_level:
raise AuthError(403, "You cannot unban user %s." % (target_user_id,))
raise UnstableSpecAuthError(
403,
"You cannot unban user %s." % (target_user_id,),
errcode=Codes.INSUFFICIENT_POWER,
)
elif target_user_id != event.user_id:
kick_level = get_named_level(auth_events, "kick", 50)
if user_level < kick_level or user_level <= target_level:
raise AuthError(403, "You cannot kick user %s." % target_user_id)
raise UnstableSpecAuthError(
403,
"You cannot kick user %s." % target_user_id,
errcode=Codes.INSUFFICIENT_POWER,
)
elif Membership.BAN == membership:
if user_level < ban_level or user_level <= target_level:
raise AuthError(403, "You don't have permission to ban")
raise UnstableSpecAuthError(
403,
"You don't have permission to ban",
errcode=Codes.INSUFFICIENT_POWER,
)
elif room_version.msc2403_knocking and Membership.KNOCK == membership:
if join_rule != JoinRules.KNOCK and (
not room_version.msc3787_knock_restricted_join_rule
@ -567,7 +601,11 @@ def _is_membership_change_allowed(
elif target_user_id != event.user_id:
raise AuthError(403, "You cannot knock for other users")
elif target_in_room:
raise AuthError(403, "You cannot knock on a room you are already in")
raise UnstableSpecAuthError(
403,
"You cannot knock on a room you are already in",
errcode=Codes.ALREADY_JOINED,
)
elif caller_invited:
raise AuthError(403, "You are already invited to this room")
elif target_banned:
@ -638,10 +676,11 @@ def _can_send_event(event: "EventBase", auth_events: StateMap["EventBase"]) -> b
user_level = get_user_power_level(event.user_id, auth_events)
if user_level < send_level:
raise AuthError(
raise UnstableSpecAuthError(
403,
"You don't have permission to post that to the room. "
+ "user_level (%d) < send_level (%d)" % (user_level, send_level),
errcode=Codes.INSUFFICIENT_POWER,
)
# Check state_key
@ -716,9 +755,10 @@ def check_historical(
historical_level = get_named_level(auth_events, "historical", 100)
if user_level < historical_level:
raise AuthError(
raise UnstableSpecAuthError(
403,
'You don\'t have permission to send send historical related events ("insertion", "batch", and "marker")',
errcode=Codes.INSUFFICIENT_POWER,
)

2
synapse/federation/federation_server.py
View file

@ -469,7 +469,7 @@ class FederationServer(FederationBase):
)
for pdu in pdus_by_room[room_id]:
event_id = pdu.event_id
pdu_results[event_id] = e.error_dict()
pdu_results[event_id] = e.error_dict(self.hs.config)
return
for pdu in pdus_by_room[room_id]:

2
synapse/handlers/auth.py
View file

@ -565,7 +565,7 @@ class AuthHandler:
except LoginError as e:
# this step failed. Merge the error dict into the response
# so that the client can have another go.
errordict = e.error_dict()
errordict = e.error_dict(self.hs.config)
creds = await self.store.get_completed_ui_auth_stages(session.session_id)
for f in flows:

13
synapse/handlers/message.py
View file

@ -41,6 +41,7 @@ from synapse.api.errors import (
NotFoundError,
ShadowBanError,
SynapseError,
UnstableSpecAuthError,
UnsupportedRoomVersionError,
)
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
@ -149,7 +150,11 @@ class MessageHandler:
"Attempted to retrieve data from a room for a user that has never been in it. "
"This should not have happened."
)
raise SynapseError(403, "User not in room", errcode=Codes.FORBIDDEN)
raise UnstableSpecAuthError(
403,
"User not in room",
errcode=Codes.NOT_JOINED,
)
return data
@ -334,7 +339,11 @@ class MessageHandler:
break
else:
# Loop fell through, AS has no interested users in room
raise AuthError(403, "Appservice not in room")
raise UnstableSpecAuthError(
403,
"Appservice not in room",
errcode=Codes.NOT_JOINED,
)
return {
user_id: {

5
synapse/handlers/room_summary.py
View file

@ -28,11 +28,11 @@ from synapse.api.constants import (
RoomTypes,
)
from synapse.api.errors import (
AuthError,
Codes,
NotFoundError,
StoreError,
SynapseError,
UnstableSpecAuthError,
UnsupportedRoomVersionError,
)
from synapse.api.ratelimiting import Ratelimiter
@ -175,10 +175,11 @@ class RoomSummaryHandler:
# First of all, check that the room is accessible.
if not await self._is_local_room_accessible(requested_room_id, requester):
raise AuthError(
raise UnstableSpecAuthError(
403,
"User %s not in room %s, and room previews are disabled"
% (requester, requested_room_id),
errcode=Codes.NOT_JOINED,
)
# If this is continuing a previous session, pull the persisted data.

18
synapse/http/server.py
View file

@ -58,6 +58,7 @@ from synapse.api.errors import (
SynapseError,
UnrecognizedRequestError,
)
from synapse.config.homeserver import HomeServerConfig
from synapse.http.site import SynapseRequest
from synapse.logging.context import defer_to_thread, preserve_fn, run_in_background
from synapse.logging.opentracing import active_span, start_active_span, trace_servlet
@ -155,15 +156,16 @@ def is_method_cancellable(method: Callable[..., Any]) -> bool:
return getattr(method, "cancellable", False)
def return_json_error(f: failure.Failure, request: SynapseRequest) -> None:
def return_json_error(
f: failure.Failure, request: SynapseRequest, config: Optional[HomeServerConfig]
) -> None:
"""Sends a JSON error response to clients."""
if f.check(SynapseError):
# mypy doesn't understand that f.check asserts the type.
exc: SynapseError = f.value # type: ignore
error_code = exc.code
error_dict = exc.error_dict()
error_dict = exc.error_dict(config)
logger.info("%s SynapseError: %s - %s", request, error_code, exc.msg)
elif f.check(CancelledError):
error_code = HTTP_STATUS_REQUEST_CANCELLED
@ -450,7 +452,7 @@ class DirectServeJsonResource(_AsyncResource):
request: SynapseRequest,
) -> None:
"""Implements _AsyncResource._send_error_response"""
return_json_error(f, request)
return_json_error(f, request, None)
@attr.s(slots=True, frozen=True, auto_attribs=True)
@ -575,6 +577,14 @@ class JsonResource(DirectServeJsonResource):
return callback_return
def _send_error_response(
self,
f: failure.Failure,
request: SynapseRequest,
) -> None:
"""Implements _AsyncResource._send_error_response"""
return_json_error(f, request, self.hs.config)
class DirectServeHtmlResource(_AsyncResource):
"""A resource that will call `self._async_on_<METHOD>` on new requests,

5
tests/rest/client/test_third_party_rules.py
View file

@ -20,6 +20,7 @@ from twisted.test.proto_helpers import MemoryReactor
from synapse.api.constants import EventTypes, LoginType, Membership
from synapse.api.errors import SynapseError
from synapse.api.room_versions import RoomVersion
from synapse.config.homeserver import HomeServerConfig
from synapse.events import EventBase
from synapse.events.third_party_rules import load_legacy_third_party_event_rules
from synapse.rest import admin
@ -185,12 +186,12 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
"""
class NastyHackException(SynapseError):
def error_dict(self) -> JsonDict:
def error_dict(self, config: Optional[HomeServerConfig]) -> JsonDict:
"""
This overrides SynapseError's `error_dict` to nastily inject
JSON into the error response.
"""
result = super().error_dict()
result = super().error_dict(config)
result["nasty"] = "very"
return result