mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-10-01 11:49:51 -04:00
449 lines
14 KiB
Python
449 lines
14 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014 OpenMarket Ltd
|
|
#
|
|
# 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.
|
|
|
|
"""This module contains classes for authenticating the user."""
|
|
|
|
from twisted.internet import defer
|
|
|
|
from synapse.api.constants import Membership, JoinRules
|
|
from synapse.api.errors import AuthError, StoreError, Codes, SynapseError
|
|
from synapse.api.events.room import (
|
|
RoomMemberEvent, RoomPowerLevelsEvent, RoomDeletionEvent,
|
|
)
|
|
from synapse.util.logutils import log_function
|
|
|
|
import logging
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class Auth(object):
|
|
|
|
def __init__(self, hs):
|
|
self.hs = hs
|
|
self.store = hs.get_datastore()
|
|
|
|
@defer.inlineCallbacks
|
|
def check(self, event, snapshot, raises=False):
|
|
""" Checks if this event is correctly authed.
|
|
|
|
Returns:
|
|
True if the auth checks pass.
|
|
Raises:
|
|
AuthError if there was a problem authorising this event. This will
|
|
be raised only if raises=True.
|
|
"""
|
|
try:
|
|
if hasattr(event, "room_id"):
|
|
is_state = hasattr(event, "state_key")
|
|
|
|
if event.type == RoomMemberEvent.TYPE:
|
|
yield self._can_replace_state(event)
|
|
allowed = yield self.is_membership_change_allowed(event)
|
|
defer.returnValue(allowed)
|
|
return
|
|
|
|
self._check_joined_room(
|
|
member=snapshot.membership_state,
|
|
user_id=snapshot.user_id,
|
|
room_id=snapshot.room_id,
|
|
)
|
|
|
|
if is_state:
|
|
# TODO (erikj): This really only should be called for *new*
|
|
# state
|
|
yield self._can_add_state(event)
|
|
yield self._can_replace_state(event)
|
|
else:
|
|
yield self._can_send_event(event)
|
|
|
|
if event.type == RoomPowerLevelsEvent.TYPE:
|
|
yield self._check_power_levels(event)
|
|
|
|
if event.type == RoomDeletionEvent.TYPE:
|
|
yield self._check_deletion(event)
|
|
|
|
defer.returnValue(True)
|
|
else:
|
|
raise AuthError(500, "Unknown event: %s" % event)
|
|
except AuthError as e:
|
|
logger.info("Event auth check failed on event %s with msg: %s",
|
|
event, e.msg)
|
|
if raises:
|
|
raise e
|
|
defer.returnValue(False)
|
|
|
|
@defer.inlineCallbacks
|
|
def check_joined_room(self, room_id, user_id):
|
|
try:
|
|
member = yield self.store.get_room_member(
|
|
room_id=room_id,
|
|
user_id=user_id
|
|
)
|
|
self._check_joined_room(member, user_id, room_id)
|
|
defer.returnValue(member)
|
|
except AttributeError:
|
|
pass
|
|
defer.returnValue(None)
|
|
|
|
def _check_joined_room(self, member, user_id, room_id):
|
|
if not member or member.membership != Membership.JOIN:
|
|
raise AuthError(403, "User %s not in room %s (%s)" % (
|
|
user_id, room_id, repr(member)
|
|
))
|
|
|
|
@defer.inlineCallbacks
|
|
def is_membership_change_allowed(self, event):
|
|
target_user_id = event.state_key
|
|
|
|
# does this room even exist
|
|
room = yield self.store.get_room(event.room_id)
|
|
if not room:
|
|
raise AuthError(403, "Room does not exist")
|
|
|
|
# get info about the caller
|
|
try:
|
|
caller = yield self.store.get_room_member(
|
|
user_id=event.user_id,
|
|
room_id=event.room_id)
|
|
except:
|
|
caller = None
|
|
caller_in_room = caller and caller.membership == "join"
|
|
|
|
# get info about the target
|
|
try:
|
|
target = yield self.store.get_room_member(
|
|
user_id=target_user_id,
|
|
room_id=event.room_id)
|
|
except:
|
|
target = None
|
|
target_in_room = target and target.membership == "join"
|
|
|
|
membership = event.content["membership"]
|
|
|
|
join_rule = yield self.store.get_room_join_rule(event.room_id)
|
|
if not join_rule:
|
|
join_rule = JoinRules.INVITE
|
|
|
|
if Membership.INVITE == membership:
|
|
# TODO (erikj): We should probably handle this more intelligently
|
|
# PRIVATE join rules.
|
|
|
|
# Invites are valid iff caller is in the room and target isn't.
|
|
if not caller_in_room: # caller isn't joined
|
|
raise AuthError(403, "You are not in room %s." % event.room_id)
|
|
elif target_in_room: # the target is already in the room.
|
|
raise AuthError(403, "%s is already in the room." %
|
|
target_user_id)
|
|
elif Membership.JOIN == membership:
|
|
# Joins are valid iff caller == target and they were:
|
|
# invited: They are accepting the invitation
|
|
# joined: It's a NOOP
|
|
if event.user_id != target_user_id:
|
|
raise AuthError(403, "Cannot force another user to join.")
|
|
elif join_rule == JoinRules.PUBLIC or room.is_public:
|
|
pass
|
|
elif join_rule == JoinRules.INVITE:
|
|
if (
|
|
not caller or caller.membership not in
|
|
[Membership.INVITE, Membership.JOIN]
|
|
):
|
|
raise AuthError(403, "You are not invited to this room.")
|
|
else:
|
|
# TODO (erikj): may_join list
|
|
# TODO (erikj): private rooms
|
|
raise AuthError(403, "You are not allowed to join this room")
|
|
elif Membership.LEAVE == membership:
|
|
# TODO (erikj): Implement kicks.
|
|
|
|
if not caller_in_room: # trying to leave a room you aren't joined
|
|
raise AuthError(403, "You are not in room %s." % event.room_id)
|
|
elif target_user_id != event.user_id:
|
|
user_level = yield self.store.get_power_level(
|
|
event.room_id,
|
|
event.user_id,
|
|
)
|
|
_, kick_level, _ = yield self.store.get_ops_levels(event.room_id)
|
|
|
|
if kick_level:
|
|
kick_level = int(kick_level)
|
|
else:
|
|
kick_level = 50
|
|
|
|
if user_level < kick_level:
|
|
raise AuthError(
|
|
403, "You cannot kick user %s." % target_user_id
|
|
)
|
|
elif Membership.BAN == membership:
|
|
user_level = yield self.store.get_power_level(
|
|
event.room_id,
|
|
event.user_id,
|
|
)
|
|
|
|
ban_level, _, _ = yield self.store.get_ops_levels(event.room_id)
|
|
|
|
if ban_level:
|
|
ban_level = int(ban_level)
|
|
else:
|
|
ban_level = 50 # FIXME (erikj): What should we do here?
|
|
|
|
if user_level < ban_level:
|
|
raise AuthError(403, "You don't have permission to ban")
|
|
else:
|
|
raise AuthError(500, "Unknown membership %s" % membership)
|
|
|
|
defer.returnValue(True)
|
|
|
|
def get_user_by_req(self, request):
|
|
""" Get a registered user's ID.
|
|
|
|
Args:
|
|
request - An HTTP request with an access_token query parameter.
|
|
Returns:
|
|
UserID : User ID object of the user making the request
|
|
Raises:
|
|
AuthError if no user by that token exists or the token is invalid.
|
|
"""
|
|
# Can optionally look elsewhere in the request (e.g. headers)
|
|
try:
|
|
return self.get_user_by_token(request.args["access_token"][0])
|
|
except KeyError:
|
|
raise AuthError(403, "Missing access token.")
|
|
|
|
@defer.inlineCallbacks
|
|
def get_user_by_token(self, token):
|
|
""" Get a registered user's ID.
|
|
|
|
Args:
|
|
token (str)- The access token to get the user by.
|
|
Returns:
|
|
UserID : User ID object of the user who has that access token.
|
|
Raises:
|
|
AuthError if no user by that token exists or the token is invalid.
|
|
"""
|
|
try:
|
|
user_id = yield self.store.get_user_by_token(token=token)
|
|
if not user_id:
|
|
raise StoreError()
|
|
defer.returnValue(self.hs.parse_userid(user_id))
|
|
except StoreError:
|
|
raise AuthError(403, "Unrecognised access token.",
|
|
errcode=Codes.UNKNOWN_TOKEN)
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def _can_send_event(self, event):
|
|
send_level = yield self.store.get_send_event_level(event.room_id)
|
|
|
|
if send_level:
|
|
send_level = int(send_level)
|
|
else:
|
|
send_level = 0
|
|
|
|
user_level = yield self.store.get_power_level(
|
|
event.room_id,
|
|
event.user_id,
|
|
)
|
|
|
|
if user_level:
|
|
user_level = int(user_level)
|
|
else:
|
|
user_level = 0
|
|
|
|
if user_level < send_level:
|
|
raise AuthError(
|
|
403, "You don't have permission to post to the room"
|
|
)
|
|
|
|
defer.returnValue(True)
|
|
|
|
@defer.inlineCallbacks
|
|
def _can_add_state(self, event):
|
|
add_level = yield self.store.get_add_state_level(event.room_id)
|
|
|
|
if not add_level:
|
|
defer.returnValue(True)
|
|
|
|
add_level = int(add_level)
|
|
|
|
user_level = yield self.store.get_power_level(
|
|
event.room_id,
|
|
event.user_id,
|
|
)
|
|
|
|
user_level = int(user_level)
|
|
|
|
if user_level < add_level:
|
|
raise AuthError(
|
|
403, "You don't have permission to add state to the room"
|
|
)
|
|
|
|
defer.returnValue(True)
|
|
|
|
@defer.inlineCallbacks
|
|
def _can_replace_state(self, event):
|
|
current_state = yield self.store.get_current_state(
|
|
event.room_id,
|
|
event.type,
|
|
event.state_key,
|
|
)
|
|
|
|
if current_state:
|
|
current_state = current_state[0]
|
|
|
|
user_level = yield self.store.get_power_level(
|
|
event.room_id,
|
|
event.user_id,
|
|
)
|
|
|
|
if user_level:
|
|
user_level = int(user_level)
|
|
else:
|
|
user_level = 0
|
|
|
|
logger.debug(
|
|
"Checking power level for %s, %s", event.user_id, user_level
|
|
)
|
|
if current_state and hasattr(current_state, "required_power_level"):
|
|
req = current_state.required_power_level
|
|
|
|
logger.debug("Checked power level for %s, %s", event.user_id, req)
|
|
if user_level < req:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to change that state"
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def _check_deletion(self, event):
|
|
user_level = yield self.store.get_power_level(
|
|
event.room_id,
|
|
event.user_id,
|
|
)
|
|
|
|
if user_level:
|
|
user_level = int(user_level)
|
|
else:
|
|
user_level = 0
|
|
|
|
_, _, delete_level = yield self.store.get_ops_levels(event.room_id)
|
|
|
|
if not delete_level:
|
|
delete_level = 50
|
|
|
|
if user_level < delete_level:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to delete events"
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def _check_power_levels(self, event):
|
|
for k, v in event.content.items():
|
|
if k == "default":
|
|
continue
|
|
|
|
# FIXME (erikj): We don't want hsob_Ts in content.
|
|
if k == "hsob_ts":
|
|
continue
|
|
|
|
try:
|
|
self.hs.parse_userid(k)
|
|
except:
|
|
raise SynapseError(400, "Not a valid user_id: %s" % (k,))
|
|
|
|
try:
|
|
int(v)
|
|
except:
|
|
raise SynapseError(400, "Not a valid power level: %s" % (v,))
|
|
|
|
current_state = yield self.store.get_current_state(
|
|
event.room_id,
|
|
event.type,
|
|
event.state_key,
|
|
)
|
|
|
|
if not current_state:
|
|
return
|
|
else:
|
|
current_state = current_state[0]
|
|
|
|
user_level = yield self.store.get_power_level(
|
|
event.room_id,
|
|
event.user_id,
|
|
)
|
|
|
|
if user_level:
|
|
user_level = int(user_level)
|
|
else:
|
|
user_level = 0
|
|
|
|
old_list = current_state.content
|
|
|
|
# FIXME (erikj)
|
|
old_people = {k: v for k, v in old_list.items() if k.startswith("@")}
|
|
new_people = {
|
|
k: v for k, v in event.content.items()
|
|
if k.startswith("@")
|
|
}
|
|
|
|
removed = set(old_people.keys()) - set(new_people.keys())
|
|
added = set(old_people.keys()) - set(new_people.keys())
|
|
same = set(old_people.keys()) & set(new_people.keys())
|
|
|
|
for r in removed:
|
|
if int(old_list.content[r]) > user_level:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to remove user: %s" % (r, )
|
|
)
|
|
|
|
for n in added:
|
|
if int(event.content[n]) > user_level:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to add ops level greater "
|
|
"than your own"
|
|
)
|
|
|
|
for s in same:
|
|
if int(event.content[s]) != int(old_list[s]):
|
|
if int(event.content[s]) > user_level:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to add ops level greater "
|
|
"than your own"
|
|
)
|
|
|
|
if "default" in old_list:
|
|
old_default = int(old_list["default"])
|
|
|
|
if old_default > user_level:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to add ops level greater than "
|
|
"your own"
|
|
)
|
|
|
|
if "default" in event.content:
|
|
new_default = int(event.content["default"])
|
|
|
|
if new_default > user_level:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to add ops level greater "
|
|
"than your own"
|
|
)
|