mirror of
https://git.anonymousland.org/anonymousland/synapse.git
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32fd6910d0
parse_integer and parse_string can take a request and raise errors in case we have wrong or missing params. This PR tries to use them more to deduplicate some code and make it better readable
677 lines
26 KiB
Python
677 lines
26 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.auth import get_access_token_from_request, has_access_token
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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.http.servlet import (
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RestServlet,
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assert_params_in_request,
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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_request(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, "Third party identifier is not allowed", 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_request(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, "Third party identifier is not allowed", 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 = "user"
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if "kind" in request.args:
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kind = request.args["kind"][0]
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if kind == "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 != "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 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 = 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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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, "Third party identifier is not allowed",
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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_request(params, ["password"])
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desired_username = params.get("username", None)
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new_password = params.get("password", None)
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guest_access_token = params.get("guest_access_token", None)
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if desired_username is not None:
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desired_username = desired_username.lower()
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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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)
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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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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):
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raise SynapseError(
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403, "HMAC incorrect",
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)
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(user_id, _) = yield self.registration_handler.register(
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localpart=username, password=password, generate_token=False,
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)
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result = yield self._create_registration_details(user_id, body)
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defer.returnValue(result)
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@defer.inlineCallbacks
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def _register_email_threepid(self, user_id, threepid, token, bind_email):
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"""Add an email address as a 3pid identifier
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Also adds an email pusher for the email address, if configured in the
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HS config
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Also optionally binds emails to the given user_id on the identity server
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Args:
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user_id (str): id of user
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threepid (object): m.login.email.identity auth response
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token (str): access_token for the user
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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_request(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:
|
|
defer.returnValue((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)
|