summary refs log tree commit diff
path: root/synapse/handlers/register.py
blob: 38c4993da036fb08cbe3b3f778ee34b203e0193b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
# 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.

"""Contains functions for registering clients."""

import logging
from typing import TYPE_CHECKING, Iterable, List, Optional, Tuple

from prometheus_client import Counter
from typing_extensions import TypedDict

from synapse import types
from synapse.api.constants import (
    MAX_USERID_LENGTH,
    EventContentFields,
    EventTypes,
    JoinRules,
    LoginType,
)
from synapse.api.errors import AuthError, Codes, ConsentNotGivenError, SynapseError
from synapse.appservice import ApplicationService
from synapse.config.server import is_threepid_reserved
from synapse.http.servlet import assert_params_in_dict
from synapse.replication.http.login import RegisterDeviceReplicationServlet
from synapse.replication.http.register import (
    ReplicationPostRegisterActionsServlet,
    ReplicationRegisterServlet,
)
from synapse.spam_checker_api import RegistrationBehaviour
from synapse.storage.state import StateFilter
from synapse.types import RoomAlias, UserID, create_requester

from ._base import BaseHandler

if TYPE_CHECKING:
    from synapse.server import HomeServer

logger = logging.getLogger(__name__)


registration_counter = Counter(
    "synapse_user_registrations_total",
    "Number of new users registered (since restart)",
    ["guest", "shadow_banned", "auth_provider"],
)

login_counter = Counter(
    "synapse_user_logins_total",
    "Number of user logins (since restart)",
    ["guest", "auth_provider"],
)


def init_counters_for_auth_provider(auth_provider_id: str) -> None:
    """Ensure the prometheus counters for the given auth provider are initialised

    This fixes a problem where the counters are not reported for a given auth provider
    until the user first logs in/registers.
    """
    for is_guest in (True, False):
        login_counter.labels(guest=is_guest, auth_provider=auth_provider_id)
        for shadow_banned in (True, False):
            registration_counter.labels(
                guest=is_guest,
                shadow_banned=shadow_banned,
                auth_provider=auth_provider_id,
            )


class LoginDict(TypedDict):
    device_id: str
    access_token: str
    valid_until_ms: Optional[int]
    refresh_token: Optional[str]


class RegistrationHandler(BaseHandler):
    def __init__(self, hs: "HomeServer"):
        super().__init__(hs)
        self.hs = hs
        self.auth = hs.get_auth()
        self._auth_handler = hs.get_auth_handler()
        self.profile_handler = hs.get_profile_handler()
        self.user_directory_handler = hs.get_user_directory_handler()
        self.identity_handler = self.hs.get_identity_handler()
        self.ratelimiter = hs.get_registration_ratelimiter()
        self.macaroon_gen = hs.get_macaroon_generator()
        self._account_validity_handler = hs.get_account_validity_handler()
        self._server_notices_mxid = hs.config.server_notices_mxid
        self._server_name = hs.hostname

        self.spam_checker = hs.get_spam_checker()

        if hs.config.worker.worker_app:
            self._register_client = ReplicationRegisterServlet.make_client(hs)
            self._register_device_client = RegisterDeviceReplicationServlet.make_client(
                hs
            )
            self._post_registration_client = (
                ReplicationPostRegisterActionsServlet.make_client(hs)
            )
        else:
            self.device_handler = hs.get_device_handler()
            self._register_device_client = self.register_device_inner
            self.pusher_pool = hs.get_pusherpool()

        self.session_lifetime = hs.config.session_lifetime
        self.access_token_lifetime = hs.config.access_token_lifetime

        init_counters_for_auth_provider("")

    async def check_username(
        self,
        localpart: str,
        guest_access_token: Optional[str] = None,
        assigned_user_id: Optional[str] = None,
    ):
        if types.contains_invalid_mxid_characters(localpart):
            raise SynapseError(
                400,
                "User ID can only contain characters a-z, 0-9, or '=_-./'",
                Codes.INVALID_USERNAME,
            )

        if not localpart:
            raise SynapseError(400, "User ID cannot be empty", Codes.INVALID_USERNAME)

        if localpart[0] == "_":
            raise SynapseError(
                400, "User ID may not begin with _", Codes.INVALID_USERNAME
            )

        user = UserID(localpart, self.hs.hostname)
        user_id = user.to_string()

        if assigned_user_id:
            if user_id == assigned_user_id:
                return
            else:
                raise SynapseError(
                    400,
                    "A different user ID has already been registered for this session",
                )

        self.check_user_id_not_appservice_exclusive(user_id)

        if len(user_id) > MAX_USERID_LENGTH:
            raise SynapseError(
                400,
                "User ID may not be longer than %s characters" % (MAX_USERID_LENGTH,),
                Codes.INVALID_USERNAME,
            )

        users = await self.store.get_users_by_id_case_insensitive(user_id)
        if users:
            if not guest_access_token:
                raise SynapseError(
                    400, "User ID already taken.", errcode=Codes.USER_IN_USE
                )
            user_data = await self.auth.get_user_by_access_token(guest_access_token)
            if (
                not user_data.is_guest
                or UserID.from_string(user_data.user_id).localpart != localpart
            ):
                raise AuthError(
                    403,
                    "Cannot register taken user ID without valid guest "
                    "credentials for that user.",
                    errcode=Codes.FORBIDDEN,
                )

        if guest_access_token is None:
            try:
                int(localpart)
                raise SynapseError(
                    400,
                    "Numeric user IDs are reserved for guest users.",
                    errcode=Codes.INVALID_USERNAME,
                )
            except ValueError:
                pass

    async def register_user(
        self,
        localpart: Optional[str] = None,
        password_hash: Optional[str] = None,
        guest_access_token: Optional[str] = None,
        make_guest: bool = False,
        admin: bool = False,
        threepid: Optional[dict] = None,
        user_type: Optional[str] = None,
        default_display_name: Optional[str] = None,
        address: Optional[str] = None,
        bind_emails: Optional[Iterable[str]] = None,
        by_admin: bool = False,
        user_agent_ips: Optional[List[Tuple[str, str]]] = None,
        auth_provider_id: Optional[str] = None,
    ) -> str:
        """Registers a new client on the server.

        Args:
            localpart: The local part of the user ID to register. If None,
              one will be generated.
            password_hash: The hashed password to assign to this user so they can
              login again. This can be None which means they cannot login again
              via a password (e.g. the user is an application service user).
            guest_access_token: The access token used when this was a guest
                account.
            make_guest: True if the the new user should be guest,
                false to add a regular user account.
            admin: True if the user should be registered as a server admin.
            threepid: The threepid used for registering, if any.
            user_type: type of user. One of the values from
              api.constants.UserTypes, or None for a normal user.
            default_display_name: if set, the new user's displayname
              will be set to this. Defaults to 'localpart'.
            address: the IP address used to perform the registration.
            bind_emails: list of emails to bind to this account.
            by_admin: True if this registration is being made via the
              admin api, otherwise False.
            user_agent_ips: Tuples of user-agents and IP addresses used
                during the registration process.
            auth_provider_id: The SSO IdP the user used, if any.
        Returns:
            The registered user_id.
        Raises:
            SynapseError if there was a problem registering.
        """
        bind_emails = bind_emails or []

        await self.check_registration_ratelimit(address)

        result = await self.spam_checker.check_registration_for_spam(
            threepid,
            localpart,
            user_agent_ips or [],
            auth_provider_id=auth_provider_id,
        )

        if result == RegistrationBehaviour.DENY:
            logger.info(
                "Blocked registration of %r",
                localpart,
            )
            # We return a 429 to make it not obvious that they've been
            # denied.
            raise SynapseError(429, "Rate limited")

        shadow_banned = result == RegistrationBehaviour.SHADOW_BAN
        if shadow_banned:
            logger.info(
                "Shadow banning registration of %r",
                localpart,
            )

        # do not check_auth_blocking if the call is coming through the Admin API
        if not by_admin:
            await self.auth.check_auth_blocking(threepid=threepid)

        if localpart is not None:
            await self.check_username(localpart, guest_access_token=guest_access_token)

            was_guest = guest_access_token is not None

            user = UserID(localpart, self.hs.hostname)
            user_id = user.to_string()

            if was_guest:
                # If the user was a guest then they already have a profile
                default_display_name = None

            elif default_display_name is None:
                default_display_name = localpart

            await self.register_with_store(
                user_id=user_id,
                password_hash=password_hash,
                was_guest=was_guest,
                make_guest=make_guest,
                create_profile_with_displayname=default_display_name,
                admin=admin,
                user_type=user_type,
                address=address,
                shadow_banned=shadow_banned,
            )

            if self.hs.config.user_directory_search_all_users:
                profile = await self.store.get_profileinfo(localpart)
                await self.user_directory_handler.handle_local_profile_change(
                    user_id, profile
                )

        else:
            # autogen a sequential user ID
            fail_count = 0
            # If a default display name is not given, generate one.
            generate_display_name = default_display_name is None
            # This breaks on successful registration *or* errors after 10 failures.
            while True:
                # Fail after being unable to find a suitable ID a few times
                if fail_count > 10:
                    raise SynapseError(500, "Unable to find a suitable guest user ID")

                localpart = await self.store.generate_user_id()
                user = UserID(localpart, self.hs.hostname)
                user_id = user.to_string()
                self.check_user_id_not_appservice_exclusive(user_id)
                if generate_display_name:
                    default_display_name = localpart
                try:
                    await self.register_with_store(
                        user_id=user_id,
                        password_hash=password_hash,
                        make_guest=make_guest,
                        create_profile_with_displayname=default_display_name,
                        address=address,
                        shadow_banned=shadow_banned,
                    )

                    # Successfully registered
                    break
                except SynapseError:
                    # if user id is taken, just generate another
                    fail_count += 1

        registration_counter.labels(
            guest=make_guest,
            shadow_banned=shadow_banned,
            auth_provider=(auth_provider_id or ""),
        ).inc()

        if not self.hs.config.user_consent_at_registration:
            if not self.hs.config.auto_join_rooms_for_guests and make_guest:
                logger.info(
                    "Skipping auto-join for %s because auto-join for guests is disabled",
                    user_id,
                )
            else:
                await self._auto_join_rooms(user_id)
        else:
            logger.info(
                "Skipping auto-join for %s because consent is required at registration",
                user_id,
            )

        # Bind any specified emails to this account
        current_time = self.hs.get_clock().time_msec()
        for email in bind_emails:
            # generate threepid dict
            threepid_dict = {
                "medium": "email",
                "address": email,
                "validated_at": current_time,
            }

            # Bind email to new account
            await self._register_email_threepid(user_id, threepid_dict, None)

        return user_id

    async def _create_and_join_rooms(self, user_id: str) -> None:
        """
        Create the auto-join rooms and join or invite the user to them.

        This should only be called when the first "real" user registers.

        Args:
            user_id: The user to join
        """
        # Getting the handlers during init gives a dependency loop.
        room_creation_handler = self.hs.get_room_creation_handler()
        room_member_handler = self.hs.get_room_member_handler()

        # Generate a stub for how the rooms will be configured.
        stub_config = {
            "preset": self.hs.config.registration.autocreate_auto_join_room_preset,
        }

        # If the configuration providers a user ID to create rooms with, use
        # that instead of the first user registered.
        requires_join = False
        if self.hs.config.registration.auto_join_user_id:
            fake_requester = create_requester(
                self.hs.config.registration.auto_join_user_id,
                authenticated_entity=self._server_name,
            )

            # If the room requires an invite, add the user to the list of invites.
            if self.hs.config.registration.auto_join_room_requires_invite:
                stub_config["invite"] = [user_id]

            # If the room is being created by a different user, the first user
            # registered needs to join it. Note that in the case of an invitation
            # being necessary this will occur after the invite was sent.
            requires_join = True
        else:
            fake_requester = create_requester(
                user_id, authenticated_entity=self._server_name
            )

        # Choose whether to federate the new room.
        if not self.hs.config.registration.autocreate_auto_join_rooms_federated:
            stub_config["creation_content"] = {EventContentFields.FEDERATE: False}

        for r in self.hs.config.registration.auto_join_rooms:
            logger.info("Auto-joining %s to %s", user_id, r)

            try:
                room_alias = RoomAlias.from_string(r)

                if self.hs.hostname != room_alias.domain:
                    # If the alias is remote, try to join the room. This might fail
                    # because the room might be invite only, but we don't have any local
                    # user in the room to invite this one with, so at this point that's
                    # the best we can do.
                    logger.info(
                        "Cannot automatically create room with alias %s as it isn't"
                        " local, trying to join the room instead",
                        r,
                    )

                    (
                        room,
                        remote_room_hosts,
                    ) = await room_member_handler.lookup_room_alias(room_alias)
                    room_id = room.to_string()

                    await room_member_handler.update_membership(
                        requester=create_requester(
                            user_id, authenticated_entity=self._server_name
                        ),
                        target=UserID.from_string(user_id),
                        room_id=room_id,
                        remote_room_hosts=remote_room_hosts,
                        action="join",
                        ratelimit=False,
                    )
                else:
                    # A shallow copy is OK here since the only key that is
                    # modified is room_alias_name.
                    config = stub_config.copy()
                    # create room expects the localpart of the room alias
                    config["room_alias_name"] = room_alias.localpart

                    info, _ = await room_creation_handler.create_room(
                        fake_requester,
                        config=config,
                        ratelimit=False,
                    )

                    # If the room does not require an invite, but another user
                    # created it, then ensure the first user joins it.
                    if requires_join:
                        await room_member_handler.update_membership(
                            requester=create_requester(
                                user_id, authenticated_entity=self._server_name
                            ),
                            target=UserID.from_string(user_id),
                            room_id=info["room_id"],
                            # Since it was just created, there are no remote hosts.
                            remote_room_hosts=[],
                            action="join",
                            ratelimit=False,
                        )
            except Exception as e:
                logger.error("Failed to join new user to %r: %r", r, e)

    async def _join_rooms(self, user_id: str) -> None:
        """
        Join or invite the user to the auto-join rooms.

        Args:
            user_id: The user to join
        """
        room_member_handler = self.hs.get_room_member_handler()

        for r in self.hs.config.registration.auto_join_rooms:
            logger.info("Auto-joining %s to %s", user_id, r)

            try:
                room_alias = RoomAlias.from_string(r)

                if RoomAlias.is_valid(r):
                    (
                        room,
                        remote_room_hosts,
                    ) = await room_member_handler.lookup_room_alias(room_alias)
                    room_id = room.to_string()
                else:
                    raise SynapseError(
                        400, "%s was not legal room ID or room alias" % (r,)
                    )

                # Calculate whether the room requires an invite or can be
                # joined directly. By default, we consider the room as requiring an
                # invite if the homeserver is in the room (unless told otherwise by the
                # join rules). Otherwise we consider it as being joinable, at the risk of
                # failing to join, but in this case there's little more we can do since
                # we don't have a local user in the room to craft up an invite with.
                requires_invite = await self.store.is_host_joined(
                    room_id,
                    self.server_name,
                )

                if requires_invite:
                    # If the server is in the room, check if the room is public.
                    state = await self.store.get_filtered_current_state_ids(
                        room_id, StateFilter.from_types([(EventTypes.JoinRules, "")])
                    )

                    event_id = state.get((EventTypes.JoinRules, ""))
                    if event_id:
                        join_rules_event = await self.store.get_event(
                            event_id, allow_none=True
                        )
                        if join_rules_event:
                            join_rule = join_rules_event.content.get("join_rule", None)
                            requires_invite = (
                                join_rule and join_rule != JoinRules.PUBLIC
                            )

                # Send the invite, if necessary.
                if requires_invite:
                    # If an invite is required, there must be a auto-join user ID.
                    assert self.hs.config.registration.auto_join_user_id

                    await room_member_handler.update_membership(
                        requester=create_requester(
                            self.hs.config.registration.auto_join_user_id,
                            authenticated_entity=self._server_name,
                        ),
                        target=UserID.from_string(user_id),
                        room_id=room_id,
                        remote_room_hosts=remote_room_hosts,
                        action="invite",
                        ratelimit=False,
                    )

                # Send the join.
                await room_member_handler.update_membership(
                    requester=create_requester(
                        user_id, authenticated_entity=self._server_name
                    ),
                    target=UserID.from_string(user_id),
                    room_id=room_id,
                    remote_room_hosts=remote_room_hosts,
                    action="join",
                    ratelimit=False,
                )

            except ConsentNotGivenError as e:
                # Technically not necessary to pull out this error though
                # moving away from bare excepts is a good thing to do.
                logger.error("Failed to join new user to %r: %r", r, e)
            except Exception as e:
                logger.error("Failed to join new user to %r: %r", r, e)

    async def _auto_join_rooms(self, user_id: str) -> None:
        """Automatically joins users to auto join rooms - creating the room in the first place
        if the user is the first to be created.

        Args:
            user_id: The user to join
        """
        # auto-join the user to any rooms we're supposed to dump them into

        # try to create the room if we're the first real user on the server. Note
        # that an auto-generated support or bot user is not a real user and will never be
        # the user to create the room
        should_auto_create_rooms = False
        is_real_user = await self.store.is_real_user(user_id)
        if self.hs.config.registration.autocreate_auto_join_rooms and is_real_user:
            count = await self.store.count_real_users()
            should_auto_create_rooms = count == 1

        if should_auto_create_rooms:
            await self._create_and_join_rooms(user_id)
        else:
            await self._join_rooms(user_id)

    async def post_consent_actions(self, user_id: str) -> None:
        """A series of registration actions that can only be carried out once consent
        has been granted

        Args:
            user_id: The user to join
        """
        await self._auto_join_rooms(user_id)

    async def appservice_register(self, user_localpart: str, as_token: str) -> str:
        user = UserID(user_localpart, self.hs.hostname)
        user_id = user.to_string()
        service = self.store.get_app_service_by_token(as_token)
        if not service:
            raise AuthError(403, "Invalid application service token.")
        if not service.is_interested_in_user(user_id):
            raise SynapseError(
                400,
                "Invalid user localpart for this application service.",
                errcode=Codes.EXCLUSIVE,
            )

        service_id = service.id if service.is_exclusive_user(user_id) else None

        self.check_user_id_not_appservice_exclusive(user_id, allowed_appservice=service)

        await self.register_with_store(
            user_id=user_id,
            password_hash="",
            appservice_id=service_id,
            create_profile_with_displayname=user.localpart,
        )
        return user_id

    def check_user_id_not_appservice_exclusive(
        self, user_id: str, allowed_appservice: Optional[ApplicationService] = None
    ) -> None:
        # don't allow people to register the server notices mxid
        if self._server_notices_mxid is not None:
            if user_id == self._server_notices_mxid:
                raise SynapseError(
                    400, "This user ID is reserved.", errcode=Codes.EXCLUSIVE
                )

        # valid user IDs must not clash with any user ID namespaces claimed by
        # application services.
        services = self.store.get_app_services()
        interested_services = [
            s
            for s in services
            if s.is_interested_in_user(user_id) and s != allowed_appservice
        ]
        for service in interested_services:
            if service.is_exclusive_user(user_id):
                raise SynapseError(
                    400,
                    "This user ID is reserved by an application service.",
                    errcode=Codes.EXCLUSIVE,
                )

    async def check_registration_ratelimit(self, address: Optional[str]) -> None:
        """A simple helper method to check whether the registration rate limit has been hit
        for a given IP address

        Args:
            address: the IP address used to perform the registration. If this is
                None, no ratelimiting will be performed.

        Raises:
            LimitExceededError: If the rate limit has been exceeded.
        """
        if not address:
            return

        await self.ratelimiter.ratelimit(None, address)

    async def register_with_store(
        self,
        user_id: str,
        password_hash: Optional[str] = None,
        was_guest: bool = False,
        make_guest: bool = False,
        appservice_id: Optional[str] = None,
        create_profile_with_displayname: Optional[str] = None,
        admin: bool = False,
        user_type: Optional[str] = None,
        address: Optional[str] = None,
        shadow_banned: bool = False,
    ) -> None:
        """Register user in the datastore.

        Args:
            user_id: The desired user ID to register.
            password_hash: Optional. The password hash for this user.
            was_guest: Optional. Whether this is a guest account being
                upgraded to a non-guest account.
            make_guest: True if the the new user should be guest,
                false to add a regular user account.
            appservice_id: The ID of the appservice registering the user.
            create_profile_with_displayname: Optionally create a
                profile for the user, setting their displayname to the given value
            admin: is an admin user?
            user_type: type of user. One of the values from
                api.constants.UserTypes, or None for a normal user.
            address: the IP address used to perform the registration.
            shadow_banned: Whether to shadow-ban the user
        """
        if self.hs.config.worker.worker_app:
            await self._register_client(
                user_id=user_id,
                password_hash=password_hash,
                was_guest=was_guest,
                make_guest=make_guest,
                appservice_id=appservice_id,
                create_profile_with_displayname=create_profile_with_displayname,
                admin=admin,
                user_type=user_type,
                address=address,
                shadow_banned=shadow_banned,
            )
        else:
            await self.store.register_user(
                user_id=user_id,
                password_hash=password_hash,
                was_guest=was_guest,
                make_guest=make_guest,
                appservice_id=appservice_id,
                create_profile_with_displayname=create_profile_with_displayname,
                admin=admin,
                user_type=user_type,
                shadow_banned=shadow_banned,
            )

            # Only call the account validity module(s) on the main process, to avoid
            # repeating e.g. database writes on all of the workers.
            await self._account_validity_handler.on_user_registration(user_id)

    async def register_device(
        self,
        user_id: str,
        device_id: Optional[str],
        initial_display_name: Optional[str],
        is_guest: bool = False,
        is_appservice_ghost: bool = False,
        auth_provider_id: Optional[str] = None,
        should_issue_refresh_token: bool = False,
    ) -> Tuple[str, str, Optional[int], Optional[str]]:
        """Register a device for a user and generate an access token.

        The access token will be limited by the homeserver's session_lifetime config.

        Args:
            user_id: full canonical @user:id
            device_id: The device ID to check, or None to generate a new one.
            initial_display_name: An optional display name for the device.
            is_guest: Whether this is a guest account
            auth_provider_id: The SSO IdP the user used, if any (just used for the
                prometheus metrics).
            should_issue_refresh_token: Whether it should also issue a refresh token
        Returns:
            Tuple of device ID, access token, access token expiration time and refresh token
        """
        res = await self._register_device_client(
            user_id=user_id,
            device_id=device_id,
            initial_display_name=initial_display_name,
            is_guest=is_guest,
            is_appservice_ghost=is_appservice_ghost,
            should_issue_refresh_token=should_issue_refresh_token,
        )

        login_counter.labels(
            guest=is_guest,
            auth_provider=(auth_provider_id or ""),
        ).inc()

        return (
            res["device_id"],
            res["access_token"],
            res["valid_until_ms"],
            res["refresh_token"],
        )

    async def register_device_inner(
        self,
        user_id: str,
        device_id: Optional[str],
        initial_display_name: Optional[str],
        is_guest: bool = False,
        is_appservice_ghost: bool = False,
        should_issue_refresh_token: bool = False,
    ) -> LoginDict:
        """Helper for register_device

        Does the bits that need doing on the main process. Not for use outside this
        class and RegisterDeviceReplicationServlet.
        """
        assert not self.hs.config.worker.worker_app
        valid_until_ms = None
        if self.session_lifetime is not None:
            if is_guest:
                raise Exception(
                    "session_lifetime is not currently implemented for guest access"
                )
            valid_until_ms = self.clock.time_msec() + self.session_lifetime

        refresh_token = None
        refresh_token_id = None

        registered_device_id = await self.device_handler.check_device_registered(
            user_id, device_id, initial_display_name
        )
        if is_guest:
            assert valid_until_ms is None
            access_token = self.macaroon_gen.generate_guest_access_token(user_id)
        else:
            if should_issue_refresh_token:
                (
                    refresh_token,
                    refresh_token_id,
                ) = await self._auth_handler.get_refresh_token_for_user_id(
                    user_id,
                    device_id=registered_device_id,
                )
                valid_until_ms = self.clock.time_msec() + self.access_token_lifetime

            access_token = await self._auth_handler.get_access_token_for_user_id(
                user_id,
                device_id=registered_device_id,
                valid_until_ms=valid_until_ms,
                is_appservice_ghost=is_appservice_ghost,
                refresh_token_id=refresh_token_id,
            )

        return {
            "device_id": registered_device_id,
            "access_token": access_token,
            "valid_until_ms": valid_until_ms,
            "refresh_token": refresh_token,
        }

    async def post_registration_actions(
        self, user_id: str, auth_result: dict, access_token: Optional[str]
    ) -> None:
        """A user has completed registration

        Args:
            user_id: The user ID that consented
            auth_result: The authenticated credentials of the newly registered user.
            access_token: The access token of the newly logged in device, or
                None if `inhibit_login` enabled.
        """
        # TODO: 3pid registration can actually happen on the workers. Consider
        # refactoring it.
        if self.hs.config.worker.worker_app:
            await self._post_registration_client(
                user_id=user_id, auth_result=auth_result, access_token=access_token
            )
            return

        if auth_result and LoginType.EMAIL_IDENTITY in auth_result:
            threepid = auth_result[LoginType.EMAIL_IDENTITY]
            # Necessary due to auth checks prior to the threepid being
            # written to the db
            if is_threepid_reserved(
                self.hs.config.mau_limits_reserved_threepids, threepid
            ):
                await self.store.upsert_monthly_active_user(user_id)

            await self._register_email_threepid(user_id, threepid, access_token)

        if auth_result and LoginType.MSISDN in auth_result:
            threepid = auth_result[LoginType.MSISDN]
            await self._register_msisdn_threepid(user_id, threepid)

        if auth_result and LoginType.TERMS in auth_result:
            await self._on_user_consented(user_id, self.hs.config.user_consent_version)

    async def _on_user_consented(self, user_id: str, consent_version: str) -> None:
        """A user consented to the terms on registration

        Args:
            user_id: The user ID that consented.
            consent_version: version of the policy the user has consented to.
        """
        logger.info("%s has consented to the privacy policy", user_id)
        await self.store.user_set_consent_version(user_id, consent_version)
        await self.post_consent_actions(user_id)

    async def _register_email_threepid(
        self, user_id: str, threepid: dict, token: Optional[str]
    ) -> None:
        """Add an email address as a 3pid identifier

        Also adds an email pusher for the email address, if configured in the
        HS config

        Must be called on master.

        Args:
            user_id: id of user
            threepid: m.login.email.identity auth response
            token: access_token for the user, or None if not logged in.
        """
        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

        await 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 homeserver)
        if (
            self.hs.config.email_enable_notifs
            and self.hs.config.email_notif_for_new_users
            and token
        ):
            # 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 = await self.store.get_user_by_access_token(token)
            # The token better still exist.
            assert user_tuple
            token_id = user_tuple.token_id

            await self.pusher_pool.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={},
            )

    async def _register_msisdn_threepid(self, user_id: str, threepid: dict) -> None:
        """Add a phone number as a 3pid identifier

        Must be called on master.

        Args:
            user_id: id of user
            threepid: m.login.msisdn auth response
        """
        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")
                return None
            raise

        await self._auth_handler.add_threepid(
            user_id,
            threepid["medium"],
            threepid["address"],
            threepid["validated_at"],
        )