1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
# 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.
import logging
from typing import Optional
from synapse.api.constants import LimitBlockingTypes, UserTypes
from synapse.api.errors import Codes, ResourceLimitError
from synapse.config.server import is_threepid_reserved
from synapse.types import Requester
logger = logging.getLogger(__name__)
class AuthBlocking:
def __init__(self, hs):
self.store = hs.get_datastore()
self._server_notices_mxid = hs.config.server_notices_mxid
self._hs_disabled = hs.config.hs_disabled
self._hs_disabled_message = hs.config.hs_disabled_message
self._admin_contact = hs.config.admin_contact
self._max_mau_value = hs.config.max_mau_value
self._limit_usage_by_mau = hs.config.limit_usage_by_mau
self._mau_limits_reserved_threepids = hs.config.mau_limits_reserved_threepids
self._server_name = hs.hostname
self._track_appservice_user_ips = hs.config.appservice.track_appservice_user_ips
async def check_auth_blocking(
self,
user_id: Optional[str] = None,
threepid: Optional[dict] = None,
user_type: Optional[str] = None,
requester: Optional[Requester] = None,
):
"""Checks if the user should be rejected for some external reason,
such as monthly active user limiting or global disable flag
Args:
user_id: If present, checks for presence against existing
MAU cohort
threepid: If present, checks for presence against configured
reserved threepid. Used in cases where the user is trying register
with a MAU blocked server, normally they would be rejected but their
threepid is on the reserved list. user_id and
threepid should never be set at the same time.
user_type: If present, is used to decide whether to check against
certain blocking reasons like MAU.
requester: If present, and the authenticated entity is a user, checks for
presence against existing MAU cohort. Passing in both a `user_id` and
`requester` is an error.
"""
if requester and user_id:
raise Exception(
"Passed in both 'user_id' and 'requester' to 'check_auth_blocking'"
)
if requester:
if requester.authenticated_entity.startswith("@"):
user_id = requester.authenticated_entity
elif requester.authenticated_entity == self._server_name:
# We never block the server from doing actions on behalf of
# users.
return
elif requester.app_service and not self._track_appservice_user_ips:
# If we're authenticated as an appservice then we only block
# auth if `track_appservice_user_ips` is set, as that option
# implicitly means that application services are part of MAU
# limits.
return
# Never fail an auth check for the server notices users or support user
# This can be a problem where event creation is prohibited due to blocking
if user_id is not None:
if user_id == self._server_notices_mxid:
return
if await self.store.is_support_user(user_id):
return
if self._hs_disabled:
raise ResourceLimitError(
403,
self._hs_disabled_message,
errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
admin_contact=self._admin_contact,
limit_type=LimitBlockingTypes.HS_DISABLED,
)
if self._limit_usage_by_mau is True:
assert not (user_id and threepid)
# If the user is already part of the MAU cohort or a trial user
if user_id:
timestamp = await self.store.user_last_seen_monthly_active(user_id)
if timestamp:
return
is_trial = await self.store.is_trial_user(user_id)
if is_trial:
return
elif threepid:
# If the user does not exist yet, but is signing up with a
# reserved threepid then pass auth check
if is_threepid_reserved(self._mau_limits_reserved_threepids, threepid):
return
elif user_type == UserTypes.SUPPORT:
# If the user does not exist yet and is of type "support",
# allow registration. Support users are excluded from MAU checks.
return
# Else if there is no room in the MAU bucket, bail
current_mau = await self.store.get_monthly_active_count()
if current_mau >= self._max_mau_value:
raise ResourceLimitError(
403,
"Monthly Active User Limit Exceeded",
admin_contact=self._admin_contact,
errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
limit_type=LimitBlockingTypes.MONTHLY_ACTIVE_USER,
)
|
