705 lines
27 KiB
Python
705 lines
27 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015 - 2016 OpenMarket Ltd
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# Copyright 2017 Vector Creations 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 hmac
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import logging
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from hashlib import sha1
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from six import string_types
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from twisted.internet import defer
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import synapse
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import synapse.types
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from synapse.api.constants import LoginType
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from synapse.api.errors import Codes, SynapseError, UnrecognizedRequestError
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from synapse.config.server import is_threepid_reserved
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from synapse.http.servlet import (
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RestServlet,
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assert_params_in_dict,
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parse_json_object_from_request,
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parse_string,
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)
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from synapse.util.msisdn import phone_number_to_msisdn
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from synapse.util.ratelimitutils import FederationRateLimiter
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from synapse.util.threepids import check_3pid_allowed
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from ._base import client_v2_patterns, interactive_auth_handler
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# We ought to be using hmac.compare_digest() but on older pythons it doesn't
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# exist. It's a _really minor_ security flaw to use plain string comparison
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# because the timing attack is so obscured by all the other code here it's
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# unlikely to make much difference
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if hasattr(hmac, "compare_digest"):
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compare_digest = hmac.compare_digest
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else:
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def compare_digest(a, b):
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return a == b
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logger = logging.getLogger(__name__)
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class EmailRegisterRequestTokenRestServlet(RestServlet):
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PATTERNS = client_v2_patterns("/register/email/requestToken$")
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def __init__(self, hs):
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"""
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Args:
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hs (synapse.server.HomeServer): server
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"""
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super(EmailRegisterRequestTokenRestServlet, self).__init__()
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self.hs = hs
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self.identity_handler = hs.get_handlers().identity_handler
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@defer.inlineCallbacks
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def on_POST(self, request):
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body = parse_json_object_from_request(request)
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assert_params_in_dict(body, [
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'id_server', 'client_secret', 'email', 'send_attempt'
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])
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if not check_3pid_allowed(self.hs, "email", body['email']):
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raise SynapseError(
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403,
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"Your email domain is not authorized to register on this server",
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Codes.THREEPID_DENIED,
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)
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existingUid = yield self.hs.get_datastore().get_user_id_by_threepid(
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'email', body['email']
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)
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if existingUid is not None:
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raise SynapseError(400, "Email is already in use", Codes.THREEPID_IN_USE)
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ret = yield self.identity_handler.requestEmailToken(**body)
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defer.returnValue((200, ret))
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class MsisdnRegisterRequestTokenRestServlet(RestServlet):
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PATTERNS = client_v2_patterns("/register/msisdn/requestToken$")
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def __init__(self, hs):
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"""
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Args:
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hs (synapse.server.HomeServer): server
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"""
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super(MsisdnRegisterRequestTokenRestServlet, self).__init__()
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self.hs = hs
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self.identity_handler = hs.get_handlers().identity_handler
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@defer.inlineCallbacks
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def on_POST(self, request):
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body = parse_json_object_from_request(request)
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assert_params_in_dict(body, [
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'id_server', 'client_secret',
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'country', 'phone_number',
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'send_attempt',
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])
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msisdn = phone_number_to_msisdn(body['country'], body['phone_number'])
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if not check_3pid_allowed(self.hs, "msisdn", msisdn):
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raise SynapseError(
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403,
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"Phone numbers are not authorized to register on this server",
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Codes.THREEPID_DENIED,
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)
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existingUid = yield self.hs.get_datastore().get_user_id_by_threepid(
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'msisdn', msisdn
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)
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if existingUid is not None:
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raise SynapseError(
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400, "Phone number is already in use", Codes.THREEPID_IN_USE
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)
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ret = yield self.identity_handler.requestMsisdnToken(**body)
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defer.returnValue((200, ret))
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class UsernameAvailabilityRestServlet(RestServlet):
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PATTERNS = client_v2_patterns("/register/available")
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def __init__(self, hs):
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"""
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Args:
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hs (synapse.server.HomeServer): server
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"""
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super(UsernameAvailabilityRestServlet, self).__init__()
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self.hs = hs
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self.registration_handler = hs.get_handlers().registration_handler
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self.ratelimiter = FederationRateLimiter(
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hs.get_clock(),
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# Time window of 2s
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window_size=2000,
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# Artificially delay requests if rate > sleep_limit/window_size
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sleep_limit=1,
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# Amount of artificial delay to apply
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sleep_msec=1000,
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# Error with 429 if more than reject_limit requests are queued
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reject_limit=1,
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# Allow 1 request at a time
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concurrent_requests=1,
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)
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@defer.inlineCallbacks
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def on_GET(self, request):
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ip = self.hs.get_ip_from_request(request)
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with self.ratelimiter.ratelimit(ip) as wait_deferred:
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yield wait_deferred
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username = parse_string(request, "username", required=True)
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yield self.registration_handler.check_username(username)
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defer.returnValue((200, {"available": True}))
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class RegisterRestServlet(RestServlet):
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PATTERNS = client_v2_patterns("/register$")
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def __init__(self, hs):
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"""
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Args:
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hs (synapse.server.HomeServer): server
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"""
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super(RegisterRestServlet, self).__init__()
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self.hs = hs
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self.auth = hs.get_auth()
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self.store = hs.get_datastore()
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self.auth_handler = hs.get_auth_handler()
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self.registration_handler = hs.get_handlers().registration_handler
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self.identity_handler = hs.get_handlers().identity_handler
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self.room_member_handler = hs.get_room_member_handler()
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self.device_handler = hs.get_device_handler()
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self.macaroon_gen = hs.get_macaroon_generator()
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@interactive_auth_handler
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@defer.inlineCallbacks
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def on_POST(self, request):
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body = parse_json_object_from_request(request)
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kind = b"user"
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if b"kind" in request.args:
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kind = request.args[b"kind"][0]
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if kind == b"guest":
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ret = yield self._do_guest_registration(body)
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defer.returnValue(ret)
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return
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elif kind != b"user":
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raise UnrecognizedRequestError(
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"Do not understand membership kind: %s" % (kind,)
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)
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# we do basic sanity checks here because the auth layer will store these
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# in sessions. Pull out the username/password provided to us.
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desired_password = None
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if 'password' in body:
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if (not isinstance(body['password'], string_types) or
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len(body['password']) > 512):
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raise SynapseError(400, "Invalid password")
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desired_password = body["password"]
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desired_username = None
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if 'username' in body:
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if (not isinstance(body['username'], string_types) or
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len(body['username']) > 512):
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raise SynapseError(400, "Invalid username")
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desired_username = body['username']
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appservice = None
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if self.auth.has_access_token(request):
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appservice = yield self.auth.get_appservice_by_req(request)
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# fork off as soon as possible for ASes and shared secret auth which
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# have completely different registration flows to normal users
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# == Application Service Registration ==
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if appservice:
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# Set the desired user according to the AS API (which uses the
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# 'user' key not 'username'). Since this is a new addition, we'll
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# fallback to 'username' if they gave one.
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desired_username = body.get("user", desired_username)
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# XXX we should check that desired_username is valid. Currently
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# we give appservices carte blanche for any insanity in mxids,
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# because the IRC bridges rely on being able to register stupid
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# IDs.
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access_token = self.auth.get_access_token_from_request(request)
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if isinstance(desired_username, string_types):
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result = yield self._do_appservice_registration(
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desired_username, access_token, body
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)
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defer.returnValue((200, result)) # we throw for non 200 responses
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return
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# for either shared secret or regular registration, downcase the
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# provided username before attempting to register it. This should mean
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# that people who try to register with upper-case in their usernames
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# don't get a nasty surprise. (Note that we treat username
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# case-insenstively in login, so they are free to carry on imagining
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# that their username is CrAzYh4cKeR if that keeps them happy)
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if desired_username is not None:
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desired_username = desired_username.lower()
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# == Shared Secret Registration == (e.g. create new user scripts)
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if 'mac' in body:
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# FIXME: Should we really be determining if this is shared secret
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# auth based purely on the 'mac' key?
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result = yield self._do_shared_secret_registration(
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desired_username, desired_password, body
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)
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defer.returnValue((200, result)) # we throw for non 200 responses
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return
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# == Normal User Registration == (everyone else)
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if not self.hs.config.enable_registration:
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raise SynapseError(403, "Registration has been disabled")
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guest_access_token = body.get("guest_access_token", None)
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if (
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'initial_device_display_name' in body and
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'password' not in body
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):
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# ignore 'initial_device_display_name' if sent without
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# a password to work around a client bug where it sent
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# the 'initial_device_display_name' param alone, wiping out
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# the original registration params
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logger.warn("Ignoring initial_device_display_name without password")
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del body['initial_device_display_name']
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session_id = self.auth_handler.get_session_id(body)
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registered_user_id = None
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if session_id:
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# if we get a registered user id out of here, it means we previously
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# registered a user for this session, so we could just return the
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# user here. We carry on and go through the auth checks though,
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# for paranoia.
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registered_user_id = self.auth_handler.get_session_data(
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session_id, "registered_user_id", None
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)
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if desired_username is not None:
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yield self.registration_handler.check_username(
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desired_username,
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guest_access_token=guest_access_token,
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assigned_user_id=registered_user_id,
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)
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# Only give msisdn flows if the x_show_msisdn flag is given:
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# this is a hack to work around the fact that clients were shipped
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# that use fallback registration if they see any flows that they don't
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# recognise, which means we break registration for these clients if we
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# advertise msisdn flows. Once usage of Riot iOS <=0.3.9 and Riot
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# Android <=0.6.9 have fallen below an acceptable threshold, this
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# parameter should go away and we should always advertise msisdn flows.
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show_msisdn = False
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if 'x_show_msisdn' in body and body['x_show_msisdn']:
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show_msisdn = True
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# FIXME: need a better error than "no auth flow found" for scenarios
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# where we required 3PID for registration but the user didn't give one
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require_email = 'email' in self.hs.config.registrations_require_3pid
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require_msisdn = 'msisdn' in self.hs.config.registrations_require_3pid
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flows = []
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if self.hs.config.enable_registration_captcha:
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# only support 3PIDless registration if no 3PIDs are required
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if not require_email and not require_msisdn:
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flows.extend([[LoginType.RECAPTCHA]])
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# only support the email-only flow if we don't require MSISDN 3PIDs
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if not require_msisdn:
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flows.extend([[LoginType.EMAIL_IDENTITY, LoginType.RECAPTCHA]])
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if show_msisdn:
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# only support the MSISDN-only flow if we don't require email 3PIDs
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if not require_email:
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flows.extend([[LoginType.MSISDN, LoginType.RECAPTCHA]])
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# always let users provide both MSISDN & email
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flows.extend([
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[LoginType.MSISDN, LoginType.EMAIL_IDENTITY, LoginType.RECAPTCHA],
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])
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else:
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# only support 3PIDless registration if no 3PIDs are required
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if not require_email and not require_msisdn:
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flows.extend([[LoginType.DUMMY]])
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# only support the email-only flow if we don't require MSISDN 3PIDs
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if not require_msisdn:
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flows.extend([[LoginType.EMAIL_IDENTITY]])
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if show_msisdn:
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# only support the MSISDN-only flow if we don't require email 3PIDs
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if not require_email or require_msisdn:
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flows.extend([[LoginType.MSISDN]])
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# always let users provide both MSISDN & email
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flows.extend([
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[LoginType.MSISDN, LoginType.EMAIL_IDENTITY]
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])
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# Append m.login.terms to all flows if we're requiring consent
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if self.hs.config.user_consent_at_registration:
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new_flows = []
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for flow in flows:
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flow.append(LoginType.TERMS)
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flows.extend(new_flows)
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auth_result, params, session_id = yield self.auth_handler.check_auth(
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flows, body, self.hs.get_ip_from_request(request)
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)
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# Check that we're not trying to register a denied 3pid.
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#
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# the user-facing checks will probably already have happened in
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# /register/email/requestToken when we requested a 3pid, but that's not
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# guaranteed.
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if auth_result:
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for login_type in [LoginType.EMAIL_IDENTITY, LoginType.MSISDN]:
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if login_type in auth_result:
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medium = auth_result[login_type]['medium']
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address = auth_result[login_type]['address']
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if not check_3pid_allowed(self.hs, medium, address):
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raise SynapseError(
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403,
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"Third party identifiers (email/phone numbers)" +
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" are not authorized on this server",
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Codes.THREEPID_DENIED,
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)
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if registered_user_id is not None:
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logger.info(
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"Already registered user ID %r for this session",
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registered_user_id
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)
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# don't re-register the threepids
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add_email = False
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add_msisdn = False
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else:
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# NB: This may be from the auth handler and NOT from the POST
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assert_params_in_dict(params, ["password"])
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desired_username = params.get("username", None)
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guest_access_token = params.get("guest_access_token", None)
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new_password = params.get("password", None)
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if desired_username is not None:
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desired_username = desired_username.lower()
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threepid = None
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if auth_result:
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threepid = auth_result.get(LoginType.EMAIL_IDENTITY)
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(registered_user_id, _) = yield self.registration_handler.register(
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localpart=desired_username,
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password=new_password,
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guest_access_token=guest_access_token,
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generate_token=False,
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threepid=threepid,
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)
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# Necessary due to auth checks prior to the threepid being
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# written to the db
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if is_threepid_reserved(self.hs.config, threepid):
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yield self.store.upsert_monthly_active_user(registered_user_id)
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# remember that we've now registered that user account, and with
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# what user ID (since the user may not have specified)
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self.auth_handler.set_session_data(
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session_id, "registered_user_id", registered_user_id
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)
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add_email = True
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add_msisdn = True
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return_dict = yield self._create_registration_details(
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registered_user_id, params
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)
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if add_email and auth_result and LoginType.EMAIL_IDENTITY in auth_result:
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threepid = auth_result[LoginType.EMAIL_IDENTITY]
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yield self._register_email_threepid(
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registered_user_id, threepid, return_dict["access_token"],
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params.get("bind_email")
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)
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if add_msisdn and auth_result and LoginType.MSISDN in auth_result:
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threepid = auth_result[LoginType.MSISDN]
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yield self._register_msisdn_threepid(
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registered_user_id, threepid, return_dict["access_token"],
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params.get("bind_msisdn")
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)
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if auth_result and LoginType.TERMS in auth_result:
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logger.info("%s has consented to the privacy policy" % registered_user_id)
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yield self.store.user_set_consent_version(
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registered_user_id, self.hs.config.user_consent_version,
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)
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defer.returnValue((200, return_dict))
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def on_OPTIONS(self, _):
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return 200, {}
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@defer.inlineCallbacks
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def _do_appservice_registration(self, username, as_token, body):
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user_id = yield self.registration_handler.appservice_register(
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username, as_token
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)
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defer.returnValue((yield self._create_registration_details(user_id, body)))
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@defer.inlineCallbacks
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def _do_shared_secret_registration(self, username, password, body):
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if not self.hs.config.registration_shared_secret:
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raise SynapseError(400, "Shared secret registration is not enabled")
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if not username:
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raise SynapseError(
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400, "username must be specified", errcode=Codes.BAD_JSON,
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)
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# use the username from the original request rather than the
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# downcased one in `username` for the mac calculation
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user = body["username"].encode("utf-8")
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# str() because otherwise hmac complains that 'unicode' does not
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# have the buffer interface
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got_mac = str(body["mac"])
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# FIXME this is different to the /v1/register endpoint, which
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# includes the password and admin flag in the hashed text. Why are
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# these different?
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want_mac = hmac.new(
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key=self.hs.config.registration_shared_secret.encode(),
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msg=user,
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digestmod=sha1,
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).hexdigest()
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|
|
if not compare_digest(want_mac, got_mac):
|
|
raise SynapseError(
|
|
403, "HMAC incorrect",
|
|
)
|
|
|
|
(user_id, _) = yield self.registration_handler.register(
|
|
localpart=username, password=password, generate_token=False,
|
|
)
|
|
|
|
result = yield self._create_registration_details(user_id, body)
|
|
defer.returnValue(result)
|
|
|
|
@defer.inlineCallbacks
|
|
def _register_email_threepid(self, user_id, threepid, token, bind_email):
|
|
"""Add an email address as a 3pid identifier
|
|
|
|
Also adds an email pusher for the email address, if configured in the
|
|
HS config
|
|
|
|
Also optionally binds emails to the given user_id on the identity server
|
|
|
|
Args:
|
|
user_id (str): id of user
|
|
threepid (object): m.login.email.identity auth response
|
|
token (str): access_token for the user
|
|
bind_email (bool): true if the client requested the email to be
|
|
bound at the identity server
|
|
Returns:
|
|
defer.Deferred:
|
|
"""
|
|
reqd = ('medium', 'address', 'validated_at')
|
|
if any(x not in threepid for x in reqd):
|
|
# This will only happen if the ID server returns a malformed response
|
|
logger.info("Can't add incomplete 3pid")
|
|
return
|
|
|
|
yield self.auth_handler.add_threepid(
|
|
user_id,
|
|
threepid['medium'],
|
|
threepid['address'],
|
|
threepid['validated_at'],
|
|
)
|
|
|
|
# And we add an email pusher for them by default, but only
|
|
# if email notifications are enabled (so people don't start
|
|
# getting mail spam where they weren't before if email
|
|
# notifs are set up on a home server)
|
|
if (self.hs.config.email_enable_notifs and
|
|
self.hs.config.email_notif_for_new_users):
|
|
# Pull the ID of the access token back out of the db
|
|
# It would really make more sense for this to be passed
|
|
# up when the access token is saved, but that's quite an
|
|
# invasive change I'd rather do separately.
|
|
user_tuple = yield self.store.get_user_by_access_token(
|
|
token
|
|
)
|
|
token_id = user_tuple["token_id"]
|
|
|
|
yield self.hs.get_pusherpool().add_pusher(
|
|
user_id=user_id,
|
|
access_token=token_id,
|
|
kind="email",
|
|
app_id="m.email",
|
|
app_display_name="Email Notifications",
|
|
device_display_name=threepid["address"],
|
|
pushkey=threepid["address"],
|
|
lang=None, # We don't know a user's language here
|
|
data={},
|
|
)
|
|
|
|
if bind_email:
|
|
logger.info("bind_email specified: binding")
|
|
logger.debug("Binding emails %s to %s" % (
|
|
threepid, user_id
|
|
))
|
|
yield self.identity_handler.bind_threepid(
|
|
threepid['threepid_creds'], user_id
|
|
)
|
|
else:
|
|
logger.info("bind_email not specified: not binding email")
|
|
|
|
@defer.inlineCallbacks
|
|
def _register_msisdn_threepid(self, user_id, threepid, token, bind_msisdn):
|
|
"""Add a phone number as a 3pid identifier
|
|
|
|
Also optionally binds msisdn to the given user_id on the identity server
|
|
|
|
Args:
|
|
user_id (str): id of user
|
|
threepid (object): m.login.msisdn auth response
|
|
token (str): access_token for the user
|
|
bind_email (bool): true if the client requested the email to be
|
|
bound at the identity server
|
|
Returns:
|
|
defer.Deferred:
|
|
"""
|
|
try:
|
|
assert_params_in_dict(threepid, ['medium', 'address', 'validated_at'])
|
|
except SynapseError as ex:
|
|
if ex.errcode == Codes.MISSING_PARAM:
|
|
# This will only happen if the ID server returns a malformed response
|
|
logger.info("Can't add incomplete 3pid")
|
|
defer.returnValue(None)
|
|
raise
|
|
|
|
yield self.auth_handler.add_threepid(
|
|
user_id,
|
|
threepid['medium'],
|
|
threepid['address'],
|
|
threepid['validated_at'],
|
|
)
|
|
|
|
if bind_msisdn:
|
|
logger.info("bind_msisdn specified: binding")
|
|
logger.debug("Binding msisdn %s to %s", threepid, user_id)
|
|
yield self.identity_handler.bind_threepid(
|
|
threepid['threepid_creds'], user_id
|
|
)
|
|
else:
|
|
logger.info("bind_msisdn not specified: not binding msisdn")
|
|
|
|
@defer.inlineCallbacks
|
|
def _create_registration_details(self, user_id, params):
|
|
"""Complete registration of newly-registered user
|
|
|
|
Allocates device_id if one was not given; also creates access_token.
|
|
|
|
Args:
|
|
(str) user_id: full canonical @user:id
|
|
(object) params: registration parameters, from which we pull
|
|
device_id, initial_device_name and inhibit_login
|
|
Returns:
|
|
defer.Deferred: (object) dictionary for response from /register
|
|
"""
|
|
result = {
|
|
"user_id": user_id,
|
|
"home_server": self.hs.hostname,
|
|
}
|
|
if not params.get("inhibit_login", False):
|
|
device_id = yield self._register_device(user_id, params)
|
|
|
|
access_token = (
|
|
yield self.auth_handler.get_access_token_for_user_id(
|
|
user_id, device_id=device_id,
|
|
)
|
|
)
|
|
|
|
result.update({
|
|
"access_token": access_token,
|
|
"device_id": device_id,
|
|
})
|
|
defer.returnValue(result)
|
|
|
|
def _register_device(self, user_id, params):
|
|
"""Register a device for a user.
|
|
|
|
This is called after the user's credentials have been validated, but
|
|
before the access token has been issued.
|
|
|
|
Args:
|
|
(str) user_id: full canonical @user:id
|
|
(object) params: registration parameters, from which we pull
|
|
device_id and initial_device_name
|
|
Returns:
|
|
defer.Deferred: (str) device_id
|
|
"""
|
|
# register the user's device
|
|
device_id = params.get("device_id")
|
|
initial_display_name = params.get("initial_device_display_name")
|
|
return self.device_handler.check_device_registered(
|
|
user_id, device_id, initial_display_name
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def _do_guest_registration(self, params):
|
|
if not self.hs.config.allow_guest_access:
|
|
raise SynapseError(403, "Guest access is disabled")
|
|
user_id, _ = yield self.registration_handler.register(
|
|
generate_token=False,
|
|
make_guest=True
|
|
)
|
|
|
|
# we don't allow guests to specify their own device_id, because
|
|
# we have nowhere to store it.
|
|
device_id = synapse.api.auth.GUEST_DEVICE_ID
|
|
initial_display_name = params.get("initial_device_display_name")
|
|
yield self.device_handler.check_device_registered(
|
|
user_id, device_id, initial_display_name
|
|
)
|
|
|
|
access_token = self.macaroon_gen.generate_access_token(
|
|
user_id, ["guest = true"]
|
|
)
|
|
defer.returnValue((200, {
|
|
"user_id": user_id,
|
|
"device_id": device_id,
|
|
"access_token": access_token,
|
|
"home_server": self.hs.hostname,
|
|
}))
|
|
|
|
|
|
def register_servlets(hs, http_server):
|
|
EmailRegisterRequestTokenRestServlet(hs).register(http_server)
|
|
MsisdnRegisterRequestTokenRestServlet(hs).register(http_server)
|
|
UsernameAvailabilityRestServlet(hs).register(http_server)
|
|
RegisterRestServlet(hs).register(http_server)
|