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![Erik Johnston](/assets/img/avatar_default.png)
* Add helpers for getting prev and auth events This is in preparation for allowing the event format to change between room versions.
712 lines
23 KiB
Python
712 lines
23 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 - 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from canonicaljson import encode_canonical_json
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from signedjson.key import decode_verify_key_bytes
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from signedjson.sign import SignatureVerifyException, verify_signed_json
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from unpaddedbase64 import decode_base64
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from synapse.api.constants import KNOWN_ROOM_VERSIONS, EventTypes, JoinRules, Membership
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from synapse.api.errors import AuthError, EventSizeError, SynapseError
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from synapse.types import UserID, get_domain_from_id
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logger = logging.getLogger(__name__)
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def check(event, auth_events, do_sig_check=True, do_size_check=True):
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""" Checks if this event is correctly authed.
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Args:
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event: the event being checked.
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auth_events (dict: event-key -> event): the existing room state.
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Raises:
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AuthError if the checks fail
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Returns:
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if the auth checks pass.
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"""
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if do_size_check:
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_check_size_limits(event)
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if not hasattr(event, "room_id"):
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raise AuthError(500, "Event has no room_id: %s" % event)
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if do_sig_check:
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sender_domain = get_domain_from_id(event.sender)
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event_id_domain = get_domain_from_id(event.event_id)
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is_invite_via_3pid = (
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event.type == EventTypes.Member
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and event.membership == Membership.INVITE
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and "third_party_invite" in event.content
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)
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# Check the sender's domain has signed the event
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if not event.signatures.get(sender_domain):
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# We allow invites via 3pid to have a sender from a different
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# HS, as the sender must match the sender of the original
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# 3pid invite. This is checked further down with the
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# other dedicated membership checks.
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if not is_invite_via_3pid:
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raise AuthError(403, "Event not signed by sender's server")
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# Check the event_id's domain has signed the event
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if not event.signatures.get(event_id_domain):
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raise AuthError(403, "Event not signed by sending server")
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if auth_events is None:
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# Oh, we don't know what the state of the room was, so we
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# are trusting that this is allowed (at least for now)
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logger.warn("Trusting event: %s", event.event_id)
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return
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if event.type == EventTypes.Create:
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sender_domain = get_domain_from_id(event.sender)
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room_id_domain = get_domain_from_id(event.room_id)
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if room_id_domain != sender_domain:
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raise AuthError(
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403,
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"Creation event's room_id domain does not match sender's"
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)
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room_version = event.content.get("room_version", "1")
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if room_version not in KNOWN_ROOM_VERSIONS:
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raise AuthError(
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403,
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"room appears to have unsupported version %s" % (
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room_version,
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))
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# FIXME
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logger.debug("Allowing! %s", event)
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return
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creation_event = auth_events.get((EventTypes.Create, ""), None)
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if not creation_event:
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raise AuthError(
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403,
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"No create event in auth events",
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)
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creating_domain = get_domain_from_id(event.room_id)
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originating_domain = get_domain_from_id(event.sender)
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if creating_domain != originating_domain:
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if not _can_federate(event, auth_events):
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raise AuthError(
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403,
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"This room has been marked as unfederatable."
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)
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# FIXME: Temp hack
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if event.type == EventTypes.Aliases:
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if not event.is_state():
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raise AuthError(
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403,
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"Alias event must be a state event",
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)
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if not event.state_key:
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raise AuthError(
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403,
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"Alias event must have non-empty state_key"
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)
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sender_domain = get_domain_from_id(event.sender)
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if event.state_key != sender_domain:
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raise AuthError(
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403,
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"Alias event's state_key does not match sender's domain"
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)
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logger.debug("Allowing! %s", event)
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return
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if logger.isEnabledFor(logging.DEBUG):
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logger.debug(
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"Auth events: %s",
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[a.event_id for a in auth_events.values()]
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)
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if event.type == EventTypes.Member:
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_is_membership_change_allowed(event, auth_events)
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logger.debug("Allowing! %s", event)
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return
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_check_event_sender_in_room(event, auth_events)
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# Special case to allow m.room.third_party_invite events wherever
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# a user is allowed to issue invites. Fixes
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# https://github.com/vector-im/vector-web/issues/1208 hopefully
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if event.type == EventTypes.ThirdPartyInvite:
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user_level = get_user_power_level(event.user_id, auth_events)
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invite_level = _get_named_level(auth_events, "invite", 0)
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if user_level < invite_level:
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raise AuthError(
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403, "You don't have permission to invite users",
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)
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else:
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logger.debug("Allowing! %s", event)
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return
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_can_send_event(event, auth_events)
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if event.type == EventTypes.PowerLevels:
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_check_power_levels(event, auth_events)
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if event.type == EventTypes.Redaction:
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check_redaction(event, auth_events)
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logger.debug("Allowing! %s", event)
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def _check_size_limits(event):
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def too_big(field):
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raise EventSizeError("%s too large" % (field,))
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if len(event.user_id) > 255:
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too_big("user_id")
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if len(event.room_id) > 255:
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too_big("room_id")
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if event.is_state() and len(event.state_key) > 255:
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too_big("state_key")
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if len(event.type) > 255:
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too_big("type")
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if len(event.event_id) > 255:
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too_big("event_id")
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if len(encode_canonical_json(event.get_pdu_json())) > 65536:
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too_big("event")
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def _can_federate(event, auth_events):
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creation_event = auth_events.get((EventTypes.Create, ""))
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return creation_event.content.get("m.federate", True) is True
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def _is_membership_change_allowed(event, auth_events):
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membership = event.content["membership"]
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# Check if this is the room creator joining:
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if len(event.prev_event_ids()) == 1 and Membership.JOIN == membership:
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# Get room creation event:
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key = (EventTypes.Create, "", )
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create = auth_events.get(key)
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if create and event.prev_event_ids()[0] == create.event_id:
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if create.content["creator"] == event.state_key:
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return
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target_user_id = event.state_key
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creating_domain = get_domain_from_id(event.room_id)
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target_domain = get_domain_from_id(target_user_id)
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if creating_domain != target_domain:
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if not _can_federate(event, auth_events):
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raise AuthError(
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403,
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"This room has been marked as unfederatable."
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)
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# get info about the caller
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key = (EventTypes.Member, event.user_id, )
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caller = auth_events.get(key)
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caller_in_room = caller and caller.membership == Membership.JOIN
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caller_invited = caller and caller.membership == Membership.INVITE
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# get info about the target
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key = (EventTypes.Member, target_user_id, )
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target = auth_events.get(key)
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target_in_room = target and target.membership == Membership.JOIN
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target_banned = target and target.membership == Membership.BAN
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key = (EventTypes.JoinRules, "", )
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join_rule_event = auth_events.get(key)
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if join_rule_event:
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join_rule = join_rule_event.content.get(
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"join_rule", JoinRules.INVITE
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)
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else:
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join_rule = JoinRules.INVITE
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user_level = get_user_power_level(event.user_id, auth_events)
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target_level = get_user_power_level(
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target_user_id, auth_events
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)
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# FIXME (erikj): What should we do here as the default?
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ban_level = _get_named_level(auth_events, "ban", 50)
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logger.debug(
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"_is_membership_change_allowed: %s",
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{
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"caller_in_room": caller_in_room,
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"caller_invited": caller_invited,
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"target_banned": target_banned,
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"target_in_room": target_in_room,
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"membership": membership,
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"join_rule": join_rule,
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"target_user_id": target_user_id,
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"event.user_id": event.user_id,
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}
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)
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if Membership.INVITE == membership and "third_party_invite" in event.content:
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if not _verify_third_party_invite(event, auth_events):
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raise AuthError(403, "You are not invited to this room.")
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if target_banned:
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raise AuthError(
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403, "%s is banned from the room" % (target_user_id,)
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)
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return
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if Membership.JOIN != membership:
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if (caller_invited
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and Membership.LEAVE == membership
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and target_user_id == event.user_id):
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return
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if not caller_in_room: # caller isn't joined
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raise AuthError(
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403,
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"%s not in room %s." % (event.user_id, event.room_id,)
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)
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if Membership.INVITE == membership:
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# TODO (erikj): We should probably handle this more intelligently
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# PRIVATE join rules.
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# Invites are valid iff caller is in the room and target isn't.
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if target_banned:
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raise AuthError(
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403, "%s is banned from the room" % (target_user_id,)
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)
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elif target_in_room: # the target is already in the room.
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raise AuthError(403, "%s is already in the room." %
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target_user_id)
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else:
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invite_level = _get_named_level(auth_events, "invite", 0)
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if user_level < invite_level:
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raise AuthError(
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403, "You don't have permission to invite users",
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)
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elif Membership.JOIN == membership:
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# Joins are valid iff caller == target and they were:
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# invited: They are accepting the invitation
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# joined: It's a NOOP
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if event.user_id != target_user_id:
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raise AuthError(403, "Cannot force another user to join.")
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elif target_banned:
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raise AuthError(403, "You are banned from this room")
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elif join_rule == JoinRules.PUBLIC:
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pass
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elif join_rule == JoinRules.INVITE:
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if not caller_in_room and not caller_invited:
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raise AuthError(403, "You are not invited to this room.")
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else:
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# TODO (erikj): may_join list
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# TODO (erikj): private rooms
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raise AuthError(403, "You are not allowed to join this room")
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elif Membership.LEAVE == membership:
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# TODO (erikj): Implement kicks.
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if target_banned and user_level < ban_level:
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raise AuthError(
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403, "You cannot unban user %s." % (target_user_id,)
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)
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elif target_user_id != event.user_id:
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kick_level = _get_named_level(auth_events, "kick", 50)
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if user_level < kick_level or user_level <= target_level:
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raise AuthError(
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403, "You cannot kick user %s." % target_user_id
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)
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elif Membership.BAN == membership:
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if user_level < ban_level or user_level <= target_level:
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raise AuthError(403, "You don't have permission to ban")
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else:
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raise AuthError(500, "Unknown membership %s" % membership)
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def _check_event_sender_in_room(event, auth_events):
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key = (EventTypes.Member, event.user_id, )
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member_event = auth_events.get(key)
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return _check_joined_room(
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member_event,
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event.user_id,
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event.room_id
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)
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def _check_joined_room(member, user_id, room_id):
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if not member or member.membership != Membership.JOIN:
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raise AuthError(403, "User %s not in room %s (%s)" % (
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user_id, room_id, repr(member)
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))
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def get_send_level(etype, state_key, power_levels_event):
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"""Get the power level required to send an event of a given type
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The federation spec [1] refers to this as "Required Power Level".
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https://matrix.org/docs/spec/server_server/unstable.html#definitions
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Args:
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etype (str): type of event
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state_key (str|None): state_key of state event, or None if it is not
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a state event.
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power_levels_event (synapse.events.EventBase|None): power levels event
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in force at this point in the room
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Returns:
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int: power level required to send this event.
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"""
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if power_levels_event:
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power_levels_content = power_levels_event.content
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else:
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power_levels_content = {}
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# see if we have a custom level for this event type
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send_level = power_levels_content.get("events", {}).get(etype)
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# otherwise, fall back to the state_default/events_default.
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if send_level is None:
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if state_key is not None:
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send_level = power_levels_content.get("state_default", 50)
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else:
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send_level = power_levels_content.get("events_default", 0)
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return int(send_level)
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def _can_send_event(event, auth_events):
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power_levels_event = _get_power_level_event(auth_events)
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send_level = get_send_level(
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event.type, event.get("state_key"), power_levels_event,
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)
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user_level = get_user_power_level(event.user_id, auth_events)
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if user_level < send_level:
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raise AuthError(
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403,
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"You don't have permission to post that to the room. " +
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"user_level (%d) < send_level (%d)" % (user_level, send_level)
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)
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# Check state_key
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if hasattr(event, "state_key"):
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if event.state_key.startswith("@"):
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if event.state_key != event.user_id:
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raise AuthError(
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403,
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"You are not allowed to set others state"
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)
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return True
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def check_redaction(event, auth_events):
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"""Check whether the event sender is allowed to redact the target event.
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Returns:
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True if the the sender is allowed to redact the target event if the
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target event was created by them.
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False if the sender is allowed to redact the target event with no
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further checks.
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Raises:
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AuthError if the event sender is definitely not allowed to redact
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the target event.
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"""
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user_level = get_user_power_level(event.user_id, auth_events)
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redact_level = _get_named_level(auth_events, "redact", 50)
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if user_level >= redact_level:
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return False
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redacter_domain = get_domain_from_id(event.event_id)
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redactee_domain = get_domain_from_id(event.redacts)
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if redacter_domain == redactee_domain:
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return True
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raise AuthError(
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403,
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"You don't have permission to redact events"
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)
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def _check_power_levels(event, auth_events):
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user_list = event.content.get("users", {})
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# Validate users
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for k, v in user_list.items():
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try:
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UserID.from_string(k)
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except Exception:
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raise SynapseError(400, "Not a valid user_id: %s" % (k,))
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try:
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int(v)
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except Exception:
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raise SynapseError(400, "Not a valid power level: %s" % (v,))
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key = (event.type, event.state_key, )
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current_state = auth_events.get(key)
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if not current_state:
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return
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user_level = get_user_power_level(event.user_id, auth_events)
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# Check other levels:
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levels_to_check = [
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("users_default", None),
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("events_default", None),
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("state_default", None),
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("ban", None),
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("redact", None),
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("kick", None),
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("invite", None),
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]
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old_list = current_state.content.get("users", {})
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for user in set(list(old_list) + list(user_list)):
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levels_to_check.append(
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(user, "users")
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)
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old_list = current_state.content.get("events", {})
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new_list = event.content.get("events", {})
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for ev_id in set(list(old_list) + list(new_list)):
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levels_to_check.append(
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(ev_id, "events")
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)
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old_state = current_state.content
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new_state = event.content
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for level_to_check, dir in levels_to_check:
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old_loc = old_state
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new_loc = new_state
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if dir:
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old_loc = old_loc.get(dir, {})
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new_loc = new_loc.get(dir, {})
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if level_to_check in old_loc:
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old_level = int(old_loc[level_to_check])
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else:
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old_level = None
|
|
|
|
if level_to_check in new_loc:
|
|
new_level = int(new_loc[level_to_check])
|
|
else:
|
|
new_level = None
|
|
|
|
if new_level is not None and old_level is not None:
|
|
if new_level == old_level:
|
|
continue
|
|
|
|
if dir == "users" and level_to_check != event.user_id:
|
|
if old_level == user_level:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to remove ops level equal "
|
|
"to your own"
|
|
)
|
|
|
|
# Check if the old and new levels are greater than the user level
|
|
# (if defined)
|
|
old_level_too_big = old_level is not None and old_level > user_level
|
|
new_level_too_big = new_level is not None and new_level > user_level
|
|
if old_level_too_big or new_level_too_big:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to add ops level greater "
|
|
"than your own"
|
|
)
|
|
|
|
|
|
def _get_power_level_event(auth_events):
|
|
return auth_events.get((EventTypes.PowerLevels, ""))
|
|
|
|
|
|
def get_user_power_level(user_id, auth_events):
|
|
"""Get a user's power level
|
|
|
|
Args:
|
|
user_id (str): user's id to look up in power_levels
|
|
auth_events (dict[(str, str), synapse.events.EventBase]):
|
|
state in force at this point in the room (or rather, a subset of
|
|
it including at least the create event and power levels event.
|
|
|
|
Returns:
|
|
int: the user's power level in this room.
|
|
"""
|
|
power_level_event = _get_power_level_event(auth_events)
|
|
if power_level_event:
|
|
level = power_level_event.content.get("users", {}).get(user_id)
|
|
if not level:
|
|
level = power_level_event.content.get("users_default", 0)
|
|
|
|
if level is None:
|
|
return 0
|
|
else:
|
|
return int(level)
|
|
else:
|
|
# if there is no power levels event, the creator gets 100 and everyone
|
|
# else gets 0.
|
|
|
|
# some things which call this don't pass the create event: hack around
|
|
# that.
|
|
key = (EventTypes.Create, "", )
|
|
create_event = auth_events.get(key)
|
|
if (create_event is not None and
|
|
create_event.content["creator"] == user_id):
|
|
return 100
|
|
else:
|
|
return 0
|
|
|
|
|
|
def _get_named_level(auth_events, name, default):
|
|
power_level_event = _get_power_level_event(auth_events)
|
|
|
|
if not power_level_event:
|
|
return default
|
|
|
|
level = power_level_event.content.get(name, None)
|
|
if level is not None:
|
|
return int(level)
|
|
else:
|
|
return default
|
|
|
|
|
|
def _verify_third_party_invite(event, auth_events):
|
|
"""
|
|
Validates that the invite event is authorized by a previous third-party invite.
|
|
|
|
Checks that the public key, and keyserver, match those in the third party invite,
|
|
and that the invite event has a signature issued using that public key.
|
|
|
|
Args:
|
|
event: The m.room.member join event being validated.
|
|
auth_events: All relevant previous context events which may be used
|
|
for authorization decisions.
|
|
|
|
Return:
|
|
True if the event fulfills the expectations of a previous third party
|
|
invite event.
|
|
"""
|
|
if "third_party_invite" not in event.content:
|
|
return False
|
|
if "signed" not in event.content["third_party_invite"]:
|
|
return False
|
|
signed = event.content["third_party_invite"]["signed"]
|
|
for key in {"mxid", "token"}:
|
|
if key not in signed:
|
|
return False
|
|
|
|
token = signed["token"]
|
|
|
|
invite_event = auth_events.get(
|
|
(EventTypes.ThirdPartyInvite, token,)
|
|
)
|
|
if not invite_event:
|
|
return False
|
|
|
|
if invite_event.sender != event.sender:
|
|
return False
|
|
|
|
if event.user_id != invite_event.user_id:
|
|
return False
|
|
|
|
if signed["mxid"] != event.state_key:
|
|
return False
|
|
if signed["token"] != token:
|
|
return False
|
|
|
|
for public_key_object in get_public_keys(invite_event):
|
|
public_key = public_key_object["public_key"]
|
|
try:
|
|
for server, signature_block in signed["signatures"].items():
|
|
for key_name, encoded_signature in signature_block.items():
|
|
if not key_name.startswith("ed25519:"):
|
|
continue
|
|
verify_key = decode_verify_key_bytes(
|
|
key_name,
|
|
decode_base64(public_key)
|
|
)
|
|
verify_signed_json(signed, server, verify_key)
|
|
|
|
# We got the public key from the invite, so we know that the
|
|
# correct server signed the signed bundle.
|
|
# The caller is responsible for checking that the signing
|
|
# server has not revoked that public key.
|
|
return True
|
|
except (KeyError, SignatureVerifyException,):
|
|
continue
|
|
return False
|
|
|
|
|
|
def get_public_keys(invite_event):
|
|
public_keys = []
|
|
if "public_key" in invite_event.content:
|
|
o = {
|
|
"public_key": invite_event.content["public_key"],
|
|
}
|
|
if "key_validity_url" in invite_event.content:
|
|
o["key_validity_url"] = invite_event.content["key_validity_url"]
|
|
public_keys.append(o)
|
|
public_keys.extend(invite_event.content.get("public_keys", []))
|
|
return public_keys
|
|
|
|
|
|
def auth_types_for_event(event):
|
|
"""Given an event, return a list of (EventType, StateKey) that may be
|
|
needed to auth the event. The returned list may be a superset of what
|
|
would actually be required depending on the full state of the room.
|
|
|
|
Used to limit the number of events to fetch from the database to
|
|
actually auth the event.
|
|
"""
|
|
if event.type == EventTypes.Create:
|
|
return []
|
|
|
|
auth_types = []
|
|
|
|
auth_types.append((EventTypes.PowerLevels, "", ))
|
|
auth_types.append((EventTypes.Member, event.sender, ))
|
|
auth_types.append((EventTypes.Create, "", ))
|
|
|
|
if event.type == EventTypes.Member:
|
|
membership = event.content["membership"]
|
|
if membership in [Membership.JOIN, Membership.INVITE]:
|
|
auth_types.append((EventTypes.JoinRules, "", ))
|
|
|
|
auth_types.append((EventTypes.Member, event.state_key, ))
|
|
|
|
if membership == Membership.INVITE:
|
|
if "third_party_invite" in event.content:
|
|
key = (
|
|
EventTypes.ThirdPartyInvite,
|
|
event.content["third_party_invite"]["signed"]["token"]
|
|
)
|
|
auth_types.append(key)
|
|
|
|
return auth_types
|