summary refs log tree commit diff
path: root/tests/test_event_auth.py
blob: 1a4d078780ecef9558f1a9505cfbfac3ba4e8fbf (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
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import unittest
from typing import Optional

from synapse import event_auth
from synapse.api.constants import EventContentFields
from synapse.api.errors import AuthError
from synapse.api.room_versions import RoomVersions
from synapse.events import EventBase, make_event_from_dict
from synapse.types import JsonDict, get_domain_from_id


class EventAuthTestCase(unittest.TestCase):
    def test_random_users_cannot_send_state_before_first_pl(self):
        """
        Check that, before the first PL lands, the creator is the only user
        that can send a state event.
        """
        creator = "@creator:example.com"
        joiner = "@joiner:example.com"
        auth_events = {
            ("m.room.create", ""): _create_event(creator),
            ("m.room.member", creator): _join_event(creator),
            ("m.room.member", joiner): _join_event(joiner),
        }

        # creator should be able to send state
        event_auth.check(
            RoomVersions.V1,
            _random_state_event(creator),
            auth_events,
            do_sig_check=False,
        )

        # joiner should not be able to send state
        self.assertRaises(
            AuthError,
            event_auth.check,
            RoomVersions.V1,
            _random_state_event(joiner),
            auth_events,
            do_sig_check=False,
        )

    def test_state_default_level(self):
        """
        Check that users above the state_default level can send state and
        those below cannot
        """
        creator = "@creator:example.com"
        pleb = "@joiner:example.com"
        king = "@joiner2:example.com"

        auth_events = {
            ("m.room.create", ""): _create_event(creator),
            ("m.room.member", creator): _join_event(creator),
            ("m.room.power_levels", ""): _power_levels_event(
                creator, {"state_default": "30", "users": {pleb: "29", king: "30"}}
            ),
            ("m.room.member", pleb): _join_event(pleb),
            ("m.room.member", king): _join_event(king),
        }

        # pleb should not be able to send state
        self.assertRaises(
            AuthError,
            event_auth.check,
            RoomVersions.V1,
            _random_state_event(pleb),
            auth_events,
            do_sig_check=False,
        ),

        # king should be able to send state
        event_auth.check(
            RoomVersions.V1,
            _random_state_event(king),
            auth_events,
            do_sig_check=False,
        )

    def test_alias_event(self):
        """Alias events have special behavior up through room version 6."""
        creator = "@creator:example.com"
        other = "@other:example.com"
        auth_events = {
            ("m.room.create", ""): _create_event(creator),
            ("m.room.member", creator): _join_event(creator),
        }

        # creator should be able to send aliases
        event_auth.check(
            RoomVersions.V1,
            _alias_event(creator),
            auth_events,
            do_sig_check=False,
        )

        # Reject an event with no state key.
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V1,
                _alias_event(creator, state_key=""),
                auth_events,
                do_sig_check=False,
            )

        # If the domain of the sender does not match the state key, reject.
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V1,
                _alias_event(creator, state_key="test.com"),
                auth_events,
                do_sig_check=False,
            )

        # Note that the member does *not* need to be in the room.
        event_auth.check(
            RoomVersions.V1,
            _alias_event(other),
            auth_events,
            do_sig_check=False,
        )

    def test_msc2432_alias_event(self):
        """After MSC2432, alias events have no special behavior."""
        creator = "@creator:example.com"
        other = "@other:example.com"
        auth_events = {
            ("m.room.create", ""): _create_event(creator),
            ("m.room.member", creator): _join_event(creator),
        }

        # creator should be able to send aliases
        event_auth.check(
            RoomVersions.V6,
            _alias_event(creator),
            auth_events,
            do_sig_check=False,
        )

        # No particular checks are done on the state key.
        event_auth.check(
            RoomVersions.V6,
            _alias_event(creator, state_key=""),
            auth_events,
            do_sig_check=False,
        )
        event_auth.check(
            RoomVersions.V6,
            _alias_event(creator, state_key="test.com"),
            auth_events,
            do_sig_check=False,
        )

        # Per standard auth rules, the member must be in the room.
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V6,
                _alias_event(other),
                auth_events,
                do_sig_check=False,
            )

    def test_msc2209(self):
        """
        Notifications power levels get checked due to MSC2209.
        """
        creator = "@creator:example.com"
        pleb = "@joiner:example.com"

        auth_events = {
            ("m.room.create", ""): _create_event(creator),
            ("m.room.member", creator): _join_event(creator),
            ("m.room.power_levels", ""): _power_levels_event(
                creator, {"state_default": "30", "users": {pleb: "30"}}
            ),
            ("m.room.member", pleb): _join_event(pleb),
        }

        # pleb should be able to modify the notifications power level.
        event_auth.check(
            RoomVersions.V1,
            _power_levels_event(pleb, {"notifications": {"room": 100}}),
            auth_events,
            do_sig_check=False,
        )

        # But an MSC2209 room rejects this change.
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V6,
                _power_levels_event(pleb, {"notifications": {"room": 100}}),
                auth_events,
                do_sig_check=False,
            )

    def test_join_rules_public(self):
        """
        Test joining a public room.
        """
        creator = "@creator:example.com"
        pleb = "@joiner:example.com"

        auth_events = {
            ("m.room.create", ""): _create_event(creator),
            ("m.room.member", creator): _join_event(creator),
            ("m.room.join_rules", ""): _join_rules_event(creator, "public"),
        }

        # Check join.
        event_auth.check(
            RoomVersions.V6,
            _join_event(pleb),
            auth_events,
            do_sig_check=False,
        )

        # A user cannot be force-joined to a room.
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V6,
                _member_event(pleb, "join", sender=creator),
                auth_events,
                do_sig_check=False,
            )

        # Banned should be rejected.
        auth_events[("m.room.member", pleb)] = _member_event(pleb, "ban")
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V6,
                _join_event(pleb),
                auth_events,
                do_sig_check=False,
            )

        # A user who left can re-join.
        auth_events[("m.room.member", pleb)] = _member_event(pleb, "leave")
        event_auth.check(
            RoomVersions.V6,
            _join_event(pleb),
            auth_events,
            do_sig_check=False,
        )

        # A user can send a join if they're in the room.
        auth_events[("m.room.member", pleb)] = _member_event(pleb, "join")
        event_auth.check(
            RoomVersions.V6,
            _join_event(pleb),
            auth_events,
            do_sig_check=False,
        )

        # A user can accept an invite.
        auth_events[("m.room.member", pleb)] = _member_event(
            pleb, "invite", sender=creator
        )
        event_auth.check(
            RoomVersions.V6,
            _join_event(pleb),
            auth_events,
            do_sig_check=False,
        )

    def test_join_rules_invite(self):
        """
        Test joining an invite only room.
        """
        creator = "@creator:example.com"
        pleb = "@joiner:example.com"

        auth_events = {
            ("m.room.create", ""): _create_event(creator),
            ("m.room.member", creator): _join_event(creator),
            ("m.room.join_rules", ""): _join_rules_event(creator, "invite"),
        }

        # A join without an invite is rejected.
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V6,
                _join_event(pleb),
                auth_events,
                do_sig_check=False,
            )

        # A user cannot be force-joined to a room.
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V6,
                _member_event(pleb, "join", sender=creator),
                auth_events,
                do_sig_check=False,
            )

        # Banned should be rejected.
        auth_events[("m.room.member", pleb)] = _member_event(pleb, "ban")
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V6,
                _join_event(pleb),
                auth_events,
                do_sig_check=False,
            )

        # A user who left cannot re-join.
        auth_events[("m.room.member", pleb)] = _member_event(pleb, "leave")
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V6,
                _join_event(pleb),
                auth_events,
                do_sig_check=False,
            )

        # A user can send a join if they're in the room.
        auth_events[("m.room.member", pleb)] = _member_event(pleb, "join")
        event_auth.check(
            RoomVersions.V6,
            _join_event(pleb),
            auth_events,
            do_sig_check=False,
        )

        # A user can accept an invite.
        auth_events[("m.room.member", pleb)] = _member_event(
            pleb, "invite", sender=creator
        )
        event_auth.check(
            RoomVersions.V6,
            _join_event(pleb),
            auth_events,
            do_sig_check=False,
        )

    def test_join_rules_msc3083_restricted(self):
        """
        Test joining a restricted room from MSC3083.

        This is similar to the public test, but has some additional checks on
        signatures.

        The checks which care about signatures fake them by simply adding an
        object of the proper form, not generating valid signatures.
        """
        creator = "@creator:example.com"
        pleb = "@joiner:example.com"

        auth_events = {
            ("m.room.create", ""): _create_event(creator),
            ("m.room.member", creator): _join_event(creator),
            ("m.room.power_levels", ""): _power_levels_event(creator, {"invite": 0}),
            ("m.room.join_rules", ""): _join_rules_event(creator, "restricted"),
        }

        # Older room versions don't understand this join rule
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V6,
                _join_event(pleb),
                auth_events,
                do_sig_check=False,
            )

        # A properly formatted join event should work.
        authorised_join_event = _join_event(
            pleb,
            additional_content={
                EventContentFields.AUTHORISING_USER: "@creator:example.com"
            },
        )
        event_auth.check(
            RoomVersions.V8,
            authorised_join_event,
            auth_events,
            do_sig_check=False,
        )

        # A join issued by a specific user works (i.e. the power level checks
        # are done properly).
        pl_auth_events = auth_events.copy()
        pl_auth_events[("m.room.power_levels", "")] = _power_levels_event(
            creator, {"invite": 100, "users": {"@inviter:foo.test": 150}}
        )
        pl_auth_events[("m.room.member", "@inviter:foo.test")] = _join_event(
            "@inviter:foo.test"
        )
        event_auth.check(
            RoomVersions.V8,
            _join_event(
                pleb,
                additional_content={
                    EventContentFields.AUTHORISING_USER: "@inviter:foo.test"
                },
            ),
            pl_auth_events,
            do_sig_check=False,
        )

        # A join which is missing an authorised server is rejected.
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V8,
                _join_event(pleb),
                auth_events,
                do_sig_check=False,
            )

        # An join authorised by a user who is not in the room is rejected.
        pl_auth_events = auth_events.copy()
        pl_auth_events[("m.room.power_levels", "")] = _power_levels_event(
            creator, {"invite": 100, "users": {"@other:example.com": 150}}
        )
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V8,
                _join_event(
                    pleb,
                    additional_content={
                        EventContentFields.AUTHORISING_USER: "@other:example.com"
                    },
                ),
                auth_events,
                do_sig_check=False,
            )

        # A user cannot be force-joined to a room. (This uses an event which
        # *would* be valid, but is sent be a different user.)
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V8,
                _member_event(
                    pleb,
                    "join",
                    sender=creator,
                    additional_content={
                        EventContentFields.AUTHORISING_USER: "@inviter:foo.test"
                    },
                ),
                auth_events,
                do_sig_check=False,
            )

        # Banned should be rejected.
        auth_events[("m.room.member", pleb)] = _member_event(pleb, "ban")
        with self.assertRaises(AuthError):
            event_auth.check(
                RoomVersions.V8,
                authorised_join_event,
                auth_events,
                do_sig_check=False,
            )

        # A user who left can re-join.
        auth_events[("m.room.member", pleb)] = _member_event(pleb, "leave")
        event_auth.check(
            RoomVersions.V8,
            authorised_join_event,
            auth_events,
            do_sig_check=False,
        )

        # A user can send a join if they're in the room. (This doesn't need to
        # be authorised since the user is already joined.)
        auth_events[("m.room.member", pleb)] = _member_event(pleb, "join")
        event_auth.check(
            RoomVersions.V8,
            _join_event(pleb),
            auth_events,
            do_sig_check=False,
        )

        # A user can accept an invite. (This doesn't need to be authorised since
        # the user was invited.)
        auth_events[("m.room.member", pleb)] = _member_event(
            pleb, "invite", sender=creator
        )
        event_auth.check(
            RoomVersions.V8,
            _join_event(pleb),
            auth_events,
            do_sig_check=False,
        )


# helpers for making events

TEST_ROOM_ID = "!test:room"


def _create_event(user_id: str) -> EventBase:
    return make_event_from_dict(
        {
            "room_id": TEST_ROOM_ID,
            "event_id": _get_event_id(),
            "type": "m.room.create",
            "sender": user_id,
            "content": {"creator": user_id},
        }
    )


def _member_event(
    user_id: str,
    membership: str,
    sender: Optional[str] = None,
    additional_content: Optional[dict] = None,
) -> EventBase:
    return make_event_from_dict(
        {
            "room_id": TEST_ROOM_ID,
            "event_id": _get_event_id(),
            "type": "m.room.member",
            "sender": sender or user_id,
            "state_key": user_id,
            "content": {"membership": membership, **(additional_content or {})},
            "prev_events": [],
        }
    )


def _join_event(user_id: str, additional_content: Optional[dict] = None) -> EventBase:
    return _member_event(user_id, "join", additional_content=additional_content)


def _power_levels_event(sender: str, content: JsonDict) -> EventBase:
    return make_event_from_dict(
        {
            "room_id": TEST_ROOM_ID,
            "event_id": _get_event_id(),
            "type": "m.room.power_levels",
            "sender": sender,
            "state_key": "",
            "content": content,
        }
    )


def _alias_event(sender: str, **kwargs) -> EventBase:
    data = {
        "room_id": TEST_ROOM_ID,
        "event_id": _get_event_id(),
        "type": "m.room.aliases",
        "sender": sender,
        "state_key": get_domain_from_id(sender),
        "content": {"aliases": []},
    }
    data.update(**kwargs)
    return make_event_from_dict(data)


def _random_state_event(sender: str) -> EventBase:
    return make_event_from_dict(
        {
            "room_id": TEST_ROOM_ID,
            "event_id": _get_event_id(),
            "type": "test.state",
            "sender": sender,
            "state_key": "",
            "content": {"membership": "join"},
        }
    )


def _join_rules_event(sender: str, join_rule: str) -> EventBase:
    return make_event_from_dict(
        {
            "room_id": TEST_ROOM_ID,
            "event_id": _get_event_id(),
            "type": "m.room.join_rules",
            "sender": sender,
            "state_key": "",
            "content": {
                "join_rule": join_rule,
            },
        }
    )


event_count = 0


def _get_event_id() -> str:
    global event_count
    c = event_count
    event_count += 1
    return "!%i:example.com" % (c,)