anonymousland-synapse/synapse/api/auth.py
2020-05-01 15:15:36 +01:00

734 lines
28 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2014 - 2016 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.
import logging
from typing import Optional
from six import itervalues
import pymacaroons
from netaddr import IPAddress
from twisted.internet import defer
import synapse.logging.opentracing as opentracing
import synapse.types
from synapse import event_auth
from synapse.api.constants import EventTypes, LimitBlockingTypes, Membership, UserTypes
from synapse.api.errors import (
AuthError,
Codes,
InvalidClientTokenError,
MissingClientTokenError,
ResourceLimitError,
)
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
from synapse.config.server import is_threepid_reserved
from synapse.events import EventBase
from synapse.types import StateMap, UserID
from synapse.util.caches import CACHE_SIZE_FACTOR, register_cache
from synapse.util.caches.lrucache import LruCache
from synapse.util.metrics import Measure
logger = logging.getLogger(__name__)
AuthEventTypes = (
EventTypes.Create,
EventTypes.Member,
EventTypes.PowerLevels,
EventTypes.JoinRules,
EventTypes.RoomHistoryVisibility,
EventTypes.ThirdPartyInvite,
)
# guests always get this device id.
GUEST_DEVICE_ID = "guest_device"
class _InvalidMacaroonException(Exception):
pass
class Auth(object):
"""
FIXME: This class contains a mix of functions for authenticating users
of our client-server API and authenticating events added to room graphs.
"""
def __init__(self, hs):
self.hs = hs
self.clock = hs.get_clock()
self.store = hs.get_datastore()
self.state = hs.get_state_handler()
self.token_cache = LruCache(CACHE_SIZE_FACTOR * 10000)
register_cache("cache", "token_cache", self.token_cache)
self._account_validity = hs.config.account_validity
@defer.inlineCallbacks
def check_from_context(self, room_version: str, event, context, do_sig_check=True):
prev_state_ids = yield context.get_prev_state_ids()
auth_events_ids = yield self.compute_auth_events(
event, prev_state_ids, for_verification=True
)
auth_events = yield self.store.get_events(auth_events_ids)
auth_events = {(e.type, e.state_key): e for e in itervalues(auth_events)}
room_version_obj = KNOWN_ROOM_VERSIONS[room_version]
event_auth.check(
room_version_obj, event, auth_events=auth_events, do_sig_check=do_sig_check
)
@defer.inlineCallbacks
def check_user_in_room(
self,
room_id: str,
user_id: str,
current_state: Optional[StateMap[EventBase]] = None,
allow_departed_users: bool = False,
):
"""Check if the user is in the room, or was at some point.
Args:
room_id: The room to check.
user_id: The user to check.
current_state: Optional map of the current state of the room.
If provided then that map is used to check whether they are a
member of the room. Otherwise the current membership is
loaded from the database.
allow_departed_users: if True, accept users that were previously
members but have now departed.
Raises:
AuthError if the user is/was not in the room.
Returns:
Deferred[Optional[EventBase]]:
Membership event for the user if the user was in the
room. This will be the join event if they are currently joined to
the room. This will be the leave event if they have left the room.
"""
if current_state:
member = current_state.get((EventTypes.Member, user_id), None)
else:
member = yield self.state.get_current_state(
room_id=room_id, event_type=EventTypes.Member, state_key=user_id
)
membership = member.membership if member else None
if membership == Membership.JOIN:
return member
# XXX this looks totally bogus. Why do we not allow users who have been banned,
# or those who were members previously and have been re-invited?
if allow_departed_users and membership == Membership.LEAVE:
forgot = yield self.store.did_forget(user_id, room_id)
if not forgot:
return member
raise AuthError(403, "User %s not in room %s" % (user_id, room_id))
@defer.inlineCallbacks
def check_host_in_room(self, room_id, host):
with Measure(self.clock, "check_host_in_room"):
latest_event_ids = yield self.store.is_host_joined(room_id, host)
return latest_event_ids
def can_federate(self, event, auth_events):
creation_event = auth_events.get((EventTypes.Create, ""))
return creation_event.content.get("m.federate", True) is True
def get_public_keys(self, invite_event):
return event_auth.get_public_keys(invite_event)
@defer.inlineCallbacks
def get_user_by_req(
self, request, allow_guest=False, rights="access", allow_expired=False
):
""" Get a registered user's ID.
Args:
request - An HTTP request with an access_token query parameter.
allow_expired - Whether to allow the request through even if the account is
expired. If true, Synapse will still require an access token to be
provided but won't check if the account it belongs to has expired. This
works thanks to /login delivering access tokens regardless of accounts'
expiration.
Returns:
defer.Deferred: resolves to a ``synapse.types.Requester`` object
Raises:
InvalidClientCredentialsError if no user by that token exists or the token
is invalid.
AuthError if access is denied for the user in the access token
"""
try:
ip_addr = self.hs.get_ip_from_request(request)
user_agent = request.requestHeaders.getRawHeaders(
b"User-Agent", default=[b""]
)[0].decode("ascii", "surrogateescape")
access_token = self.get_access_token_from_request(request)
user_id, app_service = yield self._get_appservice_user_id(request)
if user_id:
request.authenticated_entity = user_id
opentracing.set_tag("authenticated_entity", user_id)
opentracing.set_tag("appservice_id", app_service.id)
if ip_addr and self.hs.config.track_appservice_user_ips:
yield self.store.insert_client_ip(
user_id=user_id,
access_token=access_token,
ip=ip_addr,
user_agent=user_agent,
device_id="dummy-device", # stubbed
)
return synapse.types.create_requester(user_id, app_service=app_service)
user_info = yield self.get_user_by_access_token(access_token, rights)
user = user_info["user"]
token_id = user_info["token_id"]
is_guest = user_info["is_guest"]
# Deny the request if the user account has expired.
if self._account_validity.enabled and not allow_expired:
user_id = user.to_string()
expiration_ts = yield self.store.get_expiration_ts_for_user(user_id)
if (
expiration_ts is not None
and self.clock.time_msec() >= expiration_ts
):
raise AuthError(
403, "User account has expired", errcode=Codes.EXPIRED_ACCOUNT
)
# device_id may not be present if get_user_by_access_token has been
# stubbed out.
device_id = user_info.get("device_id")
if user and access_token and ip_addr:
yield self.store.insert_client_ip(
user_id=user.to_string(),
access_token=access_token,
ip=ip_addr,
user_agent=user_agent,
device_id=device_id,
)
if is_guest and not allow_guest:
raise AuthError(
403,
"Guest access not allowed",
errcode=Codes.GUEST_ACCESS_FORBIDDEN,
)
request.authenticated_entity = user.to_string()
opentracing.set_tag("authenticated_entity", user.to_string())
if device_id:
opentracing.set_tag("device_id", device_id)
return synapse.types.create_requester(
user, token_id, is_guest, device_id, app_service=app_service
)
except KeyError:
raise MissingClientTokenError()
@defer.inlineCallbacks
def _get_appservice_user_id(self, request):
app_service = self.store.get_app_service_by_token(
self.get_access_token_from_request(request)
)
if app_service is None:
return None, None
if app_service.ip_range_whitelist:
ip_address = IPAddress(self.hs.get_ip_from_request(request))
if ip_address not in app_service.ip_range_whitelist:
return None, None
if b"user_id" not in request.args:
return app_service.sender, app_service
user_id = request.args[b"user_id"][0].decode("utf8")
if app_service.sender == user_id:
return app_service.sender, app_service
if not app_service.is_interested_in_user(user_id):
raise AuthError(403, "Application service cannot masquerade as this user.")
if not (yield self.store.get_user_by_id(user_id)):
raise AuthError(403, "Application service has not registered this user")
return user_id, app_service
@defer.inlineCallbacks
def get_user_by_access_token(self, token, rights="access"):
""" Validate access token and get user_id from it
Args:
token (str): The access token to get the user by.
rights (str): The operation being performed; the access token must
allow this.
Returns:
Deferred[dict]: dict that includes:
`user` (UserID)
`is_guest` (bool)
`token_id` (int|None): access token id. May be None if guest
`device_id` (str|None): device corresponding to access token
Raises:
InvalidClientCredentialsError if no user by that token exists or the token
is invalid.
"""
if rights == "access":
# first look in the database
r = yield self._look_up_user_by_access_token(token)
if r:
valid_until_ms = r["valid_until_ms"]
if (
valid_until_ms is not None
and valid_until_ms < self.clock.time_msec()
):
# there was a valid access token, but it has expired.
# soft-logout the user.
raise InvalidClientTokenError(
msg="Access token has expired", soft_logout=True
)
return r
# otherwise it needs to be a valid macaroon
try:
user_id, guest = self._parse_and_validate_macaroon(token, rights)
user = UserID.from_string(user_id)
if rights == "access":
if not guest:
# non-guest access tokens must be in the database
logger.warning("Unrecognised access token - not in store.")
raise InvalidClientTokenError()
# Guest access tokens are not stored in the database (there can
# only be one access token per guest, anyway).
#
# In order to prevent guest access tokens being used as regular
# user access tokens (and hence getting around the invalidation
# process), we look up the user id and check that it is indeed
# a guest user.
#
# It would of course be much easier to store guest access
# tokens in the database as well, but that would break existing
# guest tokens.
stored_user = yield self.store.get_user_by_id(user_id)
if not stored_user:
raise InvalidClientTokenError("Unknown user_id %s" % user_id)
if not stored_user["is_guest"]:
raise InvalidClientTokenError(
"Guest access token used for regular user"
)
ret = {
"user": user,
"is_guest": True,
"token_id": None,
# all guests get the same device id
"device_id": GUEST_DEVICE_ID,
}
elif rights == "delete_pusher":
# We don't store these tokens in the database
ret = {
"user": user,
"is_guest": False,
"token_id": None,
"device_id": None,
}
else:
raise RuntimeError("Unknown rights setting %s", rights)
return ret
except (
_InvalidMacaroonException,
pymacaroons.exceptions.MacaroonException,
TypeError,
ValueError,
) as e:
logger.warning("Invalid macaroon in auth: %s %s", type(e), e)
raise InvalidClientTokenError("Invalid macaroon passed.")
def _parse_and_validate_macaroon(self, token, rights="access"):
"""Takes a macaroon and tries to parse and validate it. This is cached
if and only if rights == access and there isn't an expiry.
On invalid macaroon raises _InvalidMacaroonException
Returns:
(user_id, is_guest)
"""
if rights == "access":
cached = self.token_cache.get(token, None)
if cached:
return cached
try:
macaroon = pymacaroons.Macaroon.deserialize(token)
except Exception: # deserialize can throw more-or-less anything
# doesn't look like a macaroon: treat it as an opaque token which
# must be in the database.
# TODO: it would be nice to get rid of this, but apparently some
# people use access tokens which aren't macaroons
raise _InvalidMacaroonException()
try:
user_id = self.get_user_id_from_macaroon(macaroon)
guest = False
for caveat in macaroon.caveats:
if caveat.caveat_id == "guest = true":
guest = True
self.validate_macaroon(macaroon, rights, user_id=user_id)
except (pymacaroons.exceptions.MacaroonException, TypeError, ValueError):
raise InvalidClientTokenError("Invalid macaroon passed.")
if rights == "access":
self.token_cache[token] = (user_id, guest)
return user_id, guest
def get_user_id_from_macaroon(self, macaroon):
"""Retrieve the user_id given by the caveats on the macaroon.
Does *not* validate the macaroon.
Args:
macaroon (pymacaroons.Macaroon): The macaroon to validate
Returns:
(str) user id
Raises:
InvalidClientCredentialsError if there is no user_id caveat in the
macaroon
"""
user_prefix = "user_id = "
for caveat in macaroon.caveats:
if caveat.caveat_id.startswith(user_prefix):
return caveat.caveat_id[len(user_prefix) :]
raise InvalidClientTokenError("No user caveat in macaroon")
def validate_macaroon(self, macaroon, type_string, user_id):
"""
validate that a Macaroon is understood by and was signed by this server.
Args:
macaroon(pymacaroons.Macaroon): The macaroon to validate
type_string(str): The kind of token required (e.g. "access",
"delete_pusher")
user_id (str): The user_id required
"""
v = pymacaroons.Verifier()
# the verifier runs a test for every caveat on the macaroon, to check
# that it is met for the current request. Each caveat must match at
# least one of the predicates specified by satisfy_exact or
# specify_general.
v.satisfy_exact("gen = 1")
v.satisfy_exact("type = " + type_string)
v.satisfy_exact("user_id = %s" % user_id)
v.satisfy_exact("guest = true")
v.satisfy_general(self._verify_expiry)
# access_tokens include a nonce for uniqueness: any value is acceptable
v.satisfy_general(lambda c: c.startswith("nonce = "))
v.verify(macaroon, self.hs.config.macaroon_secret_key)
def _verify_expiry(self, caveat):
prefix = "time < "
if not caveat.startswith(prefix):
return False
expiry = int(caveat[len(prefix) :])
now = self.hs.get_clock().time_msec()
return now < expiry
@defer.inlineCallbacks
def _look_up_user_by_access_token(self, token):
ret = yield self.store.get_user_by_access_token(token)
if not ret:
return None
# we use ret.get() below because *lots* of unit tests stub out
# get_user_by_access_token in a way where it only returns a couple of
# the fields.
user_info = {
"user": UserID.from_string(ret.get("name")),
"token_id": ret.get("token_id", None),
"is_guest": False,
"device_id": ret.get("device_id"),
"valid_until_ms": ret.get("valid_until_ms"),
}
return user_info
def get_appservice_by_req(self, request):
token = self.get_access_token_from_request(request)
service = self.store.get_app_service_by_token(token)
if not service:
logger.warning("Unrecognised appservice access token.")
raise InvalidClientTokenError()
request.authenticated_entity = service.sender
return defer.succeed(service)
def is_server_admin(self, user):
""" Check if the given user is a local server admin.
Args:
user (UserID): user to check
Returns:
bool: True if the user is an admin
"""
return self.store.is_server_admin(user)
def compute_auth_events(
self, event, current_state_ids: StateMap[str], for_verification: bool = False,
):
"""Given an event and current state return the list of event IDs used
to auth an event.
If `for_verification` is False then only return auth events that
should be added to the event's `auth_events`.
Returns:
defer.Deferred(list[str]): List of event IDs.
"""
if event.type == EventTypes.Create:
return defer.succeed([])
# Currently we ignore the `for_verification` flag even though there are
# some situations where we can drop particular auth events when adding
# to the event's `auth_events` (e.g. joins pointing to previous joins
# when room is publically joinable). Dropping event IDs has the
# advantage that the auth chain for the room grows slower, but we use
# the auth chain in state resolution v2 to order events, which means
# care must be taken if dropping events to ensure that it doesn't
# introduce undesirable "state reset" behaviour.
#
# All of which sounds a bit tricky so we don't bother for now.
auth_ids = []
for etype, state_key in event_auth.auth_types_for_event(event):
auth_ev_id = current_state_ids.get((etype, state_key))
if auth_ev_id:
auth_ids.append(auth_ev_id)
return defer.succeed(auth_ids)
async def check_can_change_room_list(self, room_id: str, user: UserID):
"""Determine whether the user is allowed to edit the room's entry in the
published room list.
Args:
room_id
user
"""
is_admin = await self.is_server_admin(user)
if is_admin:
return True
user_id = user.to_string()
await self.check_user_in_room(room_id, user_id)
# We currently require the user is a "moderator" in the room. We do this
# by checking if they would (theoretically) be able to change the
# m.room.canonical_alias events
power_level_event = await self.state.get_current_state(
room_id, EventTypes.PowerLevels, ""
)
auth_events = {}
if power_level_event:
auth_events[(EventTypes.PowerLevels, "")] = power_level_event
send_level = event_auth.get_send_level(
EventTypes.CanonicalAlias, "", power_level_event
)
user_level = event_auth.get_user_power_level(user_id, auth_events)
return user_level >= send_level
@staticmethod
def has_access_token(request):
"""Checks if the request has an access_token.
Returns:
bool: False if no access_token was given, True otherwise.
"""
query_params = request.args.get(b"access_token")
auth_headers = request.requestHeaders.getRawHeaders(b"Authorization")
return bool(query_params) or bool(auth_headers)
@staticmethod
def get_access_token_from_request(request):
"""Extracts the access_token from the request.
Args:
request: The http request.
Returns:
unicode: The access_token
Raises:
MissingClientTokenError: If there isn't a single access_token in the
request
"""
auth_headers = request.requestHeaders.getRawHeaders(b"Authorization")
query_params = request.args.get(b"access_token")
if auth_headers:
# Try the get the access_token from a "Authorization: Bearer"
# header
if query_params is not None:
raise MissingClientTokenError(
"Mixing Authorization headers and access_token query parameters."
)
if len(auth_headers) > 1:
raise MissingClientTokenError("Too many Authorization headers.")
parts = auth_headers[0].split(b" ")
if parts[0] == b"Bearer" and len(parts) == 2:
return parts[1].decode("ascii")
else:
raise MissingClientTokenError("Invalid Authorization header.")
else:
# Try to get the access_token from the query params.
if not query_params:
raise MissingClientTokenError()
return query_params[0].decode("ascii")
@defer.inlineCallbacks
def check_user_in_room_or_world_readable(
self, room_id: str, user_id: str, allow_departed_users: bool = False
):
"""Checks that the user is or was in the room or the room is world
readable. If it isn't then an exception is raised.
Args:
room_id: room to check
user_id: user to check
allow_departed_users: if True, accept users that were previously
members but have now departed
Returns:
Deferred[tuple[str, str|None]]: Resolves to the current membership of
the user in the room and the membership event ID of the user. If
the user is not in the room and never has been, then
`(Membership.JOIN, None)` is returned.
"""
try:
# check_user_in_room will return the most recent membership
# event for the user if:
# * The user is a non-guest user, and was ever in the room
# * The user is a guest user, and has joined the room
# else it will throw.
member_event = yield self.check_user_in_room(
room_id, user_id, allow_departed_users=allow_departed_users
)
return member_event.membership, member_event.event_id
except AuthError:
visibility = yield self.state.get_current_state(
room_id, EventTypes.RoomHistoryVisibility, ""
)
if (
visibility
and visibility.content["history_visibility"] == "world_readable"
):
return Membership.JOIN, None
raise AuthError(
403,
"User %s not in room %s, and room previews are disabled"
% (user_id, room_id),
)
@defer.inlineCallbacks
def check_auth_blocking(self, user_id=None, threepid=None, user_type=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(str|None): If present, checks for presence against existing
MAU cohort
threepid(dict|None): 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(str|None): If present, is used to decide whether to check against
certain blocking reasons like MAU.
"""
# 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.hs.config.server_notices_mxid:
return
if (yield self.store.is_support_user(user_id)):
return
if self.hs.config.hs_disabled:
raise ResourceLimitError(
403,
self.hs.config.hs_disabled_message,
errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
admin_contact=self.hs.config.admin_contact,
limit_type=LimitBlockingTypes.HS_DISABLED,
)
if self.hs.config.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 = yield self.store.user_last_seen_monthly_active(user_id)
if timestamp:
return
is_trial = yield 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.hs.config.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 = yield self.store.get_monthly_active_count()
if current_mau >= self.hs.config.max_mau_value:
raise ResourceLimitError(
403,
"Monthly Active User Limit Exceeded",
admin_contact=self.hs.config.admin_contact,
errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
limit_type=LimitBlockingTypes.MONTHLY_ACTIVE_USER,
)