summary refs log tree commit diff
path: root/tests/http/test_fedclient.py
blob: 21c1297171af71abf17a0d8469a46772a1788c9e (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
# -*- coding: utf-8 -*-
# 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.

from unittest.mock import Mock

from netaddr import IPSet
from parameterized import parameterized

from twisted.internet import defer
from twisted.internet.defer import TimeoutError
from twisted.internet.error import ConnectingCancelledError, DNSLookupError
from twisted.test.proto_helpers import StringTransport
from twisted.web.client import ResponseNeverReceived
from twisted.web.http import HTTPChannel

from synapse.api.errors import RequestSendFailed
from synapse.http.matrixfederationclient import (
    MatrixFederationHttpClient,
    MatrixFederationRequest,
)
from synapse.logging.context import SENTINEL_CONTEXT, LoggingContext, current_context

from tests.server import FakeTransport
from tests.unittest import HomeserverTestCase


def check_logcontext(context):
    current = current_context()
    if current is not context:
        raise AssertionError("Expected logcontext %s but was %s" % (context, current))


class FederationClientTests(HomeserverTestCase):
    def make_homeserver(self, reactor, clock):
        hs = self.setup_test_homeserver(reactor=reactor, clock=clock)
        return hs

    def prepare(self, reactor, clock, homeserver):
        self.cl = MatrixFederationHttpClient(self.hs, None)
        self.reactor.lookups["testserv"] = "1.2.3.4"

    def test_client_get(self):
        """
        happy-path test of a GET request
        """

        @defer.inlineCallbacks
        def do_request():
            with LoggingContext("one") as context:
                fetch_d = defer.ensureDeferred(
                    self.cl.get_json("testserv:8008", "foo/bar")
                )

                # Nothing happened yet
                self.assertNoResult(fetch_d)

                # should have reset logcontext to the sentinel
                check_logcontext(SENTINEL_CONTEXT)

                try:
                    fetch_res = yield fetch_d
                    return fetch_res
                finally:
                    check_logcontext(context)

        test_d = do_request()

        self.pump()

        # Nothing happened yet
        self.assertNoResult(test_d)

        # Make sure treq is trying to connect
        clients = self.reactor.tcpClients
        self.assertEqual(len(clients), 1)
        (host, port, factory, _timeout, _bindAddress) = clients[0]
        self.assertEqual(host, "1.2.3.4")
        self.assertEqual(port, 8008)

        # complete the connection and wire it up to a fake transport
        protocol = factory.buildProtocol(None)
        transport = StringTransport()
        protocol.makeConnection(transport)

        # that should have made it send the request to the transport
        self.assertRegex(transport.value(), b"^GET /foo/bar")
        self.assertRegex(transport.value(), b"Host: testserv:8008")

        # Deferred is still without a result
        self.assertNoResult(test_d)

        # Send it the HTTP response
        res_json = '{ "a": 1 }'.encode("ascii")
        protocol.dataReceived(
            b"HTTP/1.1 200 OK\r\n"
            b"Server: Fake\r\n"
            b"Content-Type: application/json\r\n"
            b"Content-Length: %i\r\n"
            b"\r\n"
            b"%s" % (len(res_json), res_json)
        )

        self.pump()

        res = self.successResultOf(test_d)

        # check the response is as expected
        self.assertEqual(res, {"a": 1})

    def test_dns_error(self):
        """
        If the DNS lookup returns an error, it will bubble up.
        """
        d = defer.ensureDeferred(
            self.cl.get_json("testserv2:8008", "foo/bar", timeout=10000)
        )
        self.pump()

        f = self.failureResultOf(d)
        self.assertIsInstance(f.value, RequestSendFailed)
        self.assertIsInstance(f.value.inner_exception, DNSLookupError)

    def test_client_connection_refused(self):
        d = defer.ensureDeferred(
            self.cl.get_json("testserv:8008", "foo/bar", timeout=10000)
        )

        self.pump()

        # Nothing happened yet
        self.assertNoResult(d)

        clients = self.reactor.tcpClients
        self.assertEqual(len(clients), 1)
        (host, port, factory, _timeout, _bindAddress) = clients[0]
        self.assertEqual(host, "1.2.3.4")
        self.assertEqual(port, 8008)
        e = Exception("go away")
        factory.clientConnectionFailed(None, e)
        self.pump(0.5)

        f = self.failureResultOf(d)

        self.assertIsInstance(f.value, RequestSendFailed)
        self.assertIs(f.value.inner_exception, e)

    def test_client_never_connect(self):
        """
        If the HTTP request is not connected and is timed out, it'll give a
        ConnectingCancelledError or TimeoutError.
        """
        d = defer.ensureDeferred(
            self.cl.get_json("testserv:8008", "foo/bar", timeout=10000)
        )

        self.pump()

        # Nothing happened yet
        self.assertNoResult(d)

        # Make sure treq is trying to connect
        clients = self.reactor.tcpClients
        self.assertEqual(len(clients), 1)
        self.assertEqual(clients[0][0], "1.2.3.4")
        self.assertEqual(clients[0][1], 8008)

        # Deferred is still without a result
        self.assertNoResult(d)

        # Push by enough to time it out
        self.reactor.advance(10.5)
        f = self.failureResultOf(d)

        self.assertIsInstance(f.value, RequestSendFailed)
        self.assertIsInstance(
            f.value.inner_exception, (ConnectingCancelledError, TimeoutError)
        )

    def test_client_connect_no_response(self):
        """
        If the HTTP request is connected, but gets no response before being
        timed out, it'll give a ResponseNeverReceived.
        """
        d = defer.ensureDeferred(
            self.cl.get_json("testserv:8008", "foo/bar", timeout=10000)
        )

        self.pump()

        # Nothing happened yet
        self.assertNoResult(d)

        # Make sure treq is trying to connect
        clients = self.reactor.tcpClients
        self.assertEqual(len(clients), 1)
        self.assertEqual(clients[0][0], "1.2.3.4")
        self.assertEqual(clients[0][1], 8008)

        conn = Mock()
        client = clients[0][2].buildProtocol(None)
        client.makeConnection(conn)

        # Deferred is still without a result
        self.assertNoResult(d)

        # Push by enough to time it out
        self.reactor.advance(10.5)
        f = self.failureResultOf(d)

        self.assertIsInstance(f.value, RequestSendFailed)
        self.assertIsInstance(f.value.inner_exception, ResponseNeverReceived)

    def test_client_ip_range_blacklist(self):
        """Ensure that Synapse does not try to connect to blacklisted IPs"""

        # Set up the ip_range blacklist
        self.hs.config.federation_ip_range_blacklist = IPSet(
            ["127.0.0.0/8", "fe80::/64"]
        )
        self.reactor.lookups["internal"] = "127.0.0.1"
        self.reactor.lookups["internalv6"] = "fe80:0:0:0:0:8a2e:370:7337"
        self.reactor.lookups["fine"] = "10.20.30.40"
        cl = MatrixFederationHttpClient(self.hs, None)

        # Try making a GET request to a blacklisted IPv4 address
        # ------------------------------------------------------
        # Make the request
        d = defer.ensureDeferred(cl.get_json("internal:8008", "foo/bar", timeout=10000))

        # Nothing happened yet
        self.assertNoResult(d)

        self.pump(1)

        # Check that it was unable to resolve the address
        clients = self.reactor.tcpClients
        self.assertEqual(len(clients), 0)

        f = self.failureResultOf(d)
        self.assertIsInstance(f.value, RequestSendFailed)
        self.assertIsInstance(f.value.inner_exception, DNSLookupError)

        # Try making a POST request to a blacklisted IPv6 address
        # -------------------------------------------------------
        # Make the request
        d = defer.ensureDeferred(
            cl.post_json("internalv6:8008", "foo/bar", timeout=10000)
        )

        # Nothing has happened yet
        self.assertNoResult(d)

        # Move the reactor forwards
        self.pump(1)

        # Check that it was unable to resolve the address
        clients = self.reactor.tcpClients
        self.assertEqual(len(clients), 0)

        # Check that it was due to a blacklisted DNS lookup
        f = self.failureResultOf(d, RequestSendFailed)
        self.assertIsInstance(f.value.inner_exception, DNSLookupError)

        # Try making a GET request to a non-blacklisted IPv4 address
        # ----------------------------------------------------------
        # Make the request
        d = defer.ensureDeferred(cl.post_json("fine:8008", "foo/bar", timeout=10000))

        # Nothing has happened yet
        self.assertNoResult(d)

        # Move the reactor forwards
        self.pump(1)

        # Check that it was able to resolve the address
        clients = self.reactor.tcpClients
        self.assertNotEqual(len(clients), 0)

        # Connection will still fail as this IP address does not resolve to anything
        f = self.failureResultOf(d, RequestSendFailed)
        self.assertIsInstance(f.value.inner_exception, ConnectingCancelledError)

    def test_client_gets_headers(self):
        """
        Once the client gets the headers, _request returns successfully.
        """
        request = MatrixFederationRequest(
            method="GET", destination="testserv:8008", path="foo/bar"
        )
        d = defer.ensureDeferred(self.cl._send_request(request, timeout=10000))

        self.pump()

        conn = Mock()
        clients = self.reactor.tcpClients
        client = clients[0][2].buildProtocol(None)
        client.makeConnection(conn)

        # Deferred does not have a result
        self.assertNoResult(d)

        # Send it the HTTP response
        client.dataReceived(b"HTTP/1.1 200 OK\r\nServer: Fake\r\n\r\n")

        # We should get a successful response
        r = self.successResultOf(d)
        self.assertEqual(r.code, 200)

    @parameterized.expand(["get_json", "post_json", "delete_json", "put_json"])
    def test_timeout_reading_body(self, method_name: str):
        """
        If the HTTP request is connected, but gets no response before being
        timed out, it'll give a RequestSendFailed with can_retry.
        """
        method = getattr(self.cl, method_name)
        d = defer.ensureDeferred(method("testserv:8008", "foo/bar", timeout=10000))

        self.pump()

        conn = Mock()
        clients = self.reactor.tcpClients
        client = clients[0][2].buildProtocol(None)
        client.makeConnection(conn)

        # Deferred does not have a result
        self.assertNoResult(d)

        # Send it the HTTP response
        client.dataReceived(
            (
                b"HTTP/1.1 200 OK\r\nContent-Type: application/json\r\n"
                b"Server: Fake\r\n\r\n"
            )
        )

        # Push by enough to time it out
        self.reactor.advance(10.5)
        f = self.failureResultOf(d)

        self.assertIsInstance(f.value, RequestSendFailed)
        self.assertTrue(f.value.can_retry)
        self.assertIsInstance(f.value.inner_exception, defer.TimeoutError)

    def test_client_requires_trailing_slashes(self):
        """
        If a connection is made to a client but the client rejects it due to
        requiring a trailing slash. We need to retry the request with a
        trailing slash. Workaround for Synapse <= v0.99.3, explained in #3622.
        """
        d = defer.ensureDeferred(
            self.cl.get_json("testserv:8008", "foo/bar", try_trailing_slash_on_400=True)
        )

        # Send the request
        self.pump()

        # there should have been a call to connectTCP
        clients = self.reactor.tcpClients
        self.assertEqual(len(clients), 1)
        (_host, _port, factory, _timeout, _bindAddress) = clients[0]

        # complete the connection and wire it up to a fake transport
        client = factory.buildProtocol(None)
        conn = StringTransport()
        client.makeConnection(conn)

        # that should have made it send the request to the connection
        self.assertRegex(conn.value(), b"^GET /foo/bar")

        # Clear the original request data before sending a response
        conn.clear()

        # Send the HTTP response
        client.dataReceived(
            b"HTTP/1.1 400 Bad Request\r\n"
            b"Content-Type: application/json\r\n"
            b"Content-Length: 59\r\n"
            b"\r\n"
            b'{"errcode":"M_UNRECOGNIZED","error":"Unrecognized request"}'
        )

        # We should get another request with a trailing slash
        self.assertRegex(conn.value(), b"^GET /foo/bar/")

        # Send a happy response this time
        client.dataReceived(
            b"HTTP/1.1 200 OK\r\n"
            b"Content-Type: application/json\r\n"
            b"Content-Length: 2\r\n"
            b"\r\n"
            b"{}"
        )

        # We should get a successful response
        r = self.successResultOf(d)
        self.assertEqual(r, {})

    def test_client_does_not_retry_on_400_plus(self):
        """
        Another test for trailing slashes but now test that we don't retry on
        trailing slashes on a non-400/M_UNRECOGNIZED response.

        See test_client_requires_trailing_slashes() for context.
        """
        d = defer.ensureDeferred(
            self.cl.get_json("testserv:8008", "foo/bar", try_trailing_slash_on_400=True)
        )

        # Send the request
        self.pump()

        # there should have been a call to connectTCP
        clients = self.reactor.tcpClients
        self.assertEqual(len(clients), 1)
        (_host, _port, factory, _timeout, _bindAddress) = clients[0]

        # complete the connection and wire it up to a fake transport
        client = factory.buildProtocol(None)
        conn = StringTransport()
        client.makeConnection(conn)

        # that should have made it send the request to the connection
        self.assertRegex(conn.value(), b"^GET /foo/bar")

        # Clear the original request data before sending a response
        conn.clear()

        # Send the HTTP response
        client.dataReceived(
            b"HTTP/1.1 404 Not Found\r\n"
            b"Content-Type: application/json\r\n"
            b"Content-Length: 2\r\n"
            b"\r\n"
            b"{}"
        )

        # We should not get another request
        self.assertEqual(conn.value(), b"")

        # We should get a 404 failure response
        self.failureResultOf(d)

    def test_client_sends_body(self):
        defer.ensureDeferred(
            self.cl.post_json(
                "testserv:8008", "foo/bar", timeout=10000, data={"a": "b"}
            )
        )

        self.pump()

        clients = self.reactor.tcpClients
        self.assertEqual(len(clients), 1)
        client = clients[0][2].buildProtocol(None)
        server = HTTPChannel()

        client.makeConnection(FakeTransport(server, self.reactor))
        server.makeConnection(FakeTransport(client, self.reactor))

        self.pump(0.1)

        self.assertEqual(len(server.requests), 1)
        request = server.requests[0]
        content = request.content.read()
        self.assertEqual(content, b'{"a":"b"}')

    def test_closes_connection(self):
        """Check that the client closes unused HTTP connections"""
        d = defer.ensureDeferred(self.cl.get_json("testserv:8008", "foo/bar"))

        self.pump()

        # there should have been a call to connectTCP
        clients = self.reactor.tcpClients
        self.assertEqual(len(clients), 1)
        (_host, _port, factory, _timeout, _bindAddress) = clients[0]

        # complete the connection and wire it up to a fake transport
        client = factory.buildProtocol(None)
        conn = StringTransport()
        client.makeConnection(conn)

        # that should have made it send the request to the connection
        self.assertRegex(conn.value(), b"^GET /foo/bar")

        # Send the HTTP response
        client.dataReceived(
            b"HTTP/1.1 200 OK\r\n"
            b"Content-Type: application/json\r\n"
            b"Content-Length: 2\r\n"
            b"\r\n"
            b"{}"
        )

        # We should get a successful response
        r = self.successResultOf(d)
        self.assertEqual(r, {})

        self.assertFalse(conn.disconnecting)

        # wait for a while
        self.reactor.advance(120)

        self.assertTrue(conn.disconnecting)

    @parameterized.expand([(b"",), (b"foo",), (b'{"a": Infinity}',)])
    def test_json_error(self, return_value):
        """
        Test what happens if invalid JSON is returned from the remote endpoint.
        """

        test_d = defer.ensureDeferred(self.cl.get_json("testserv:8008", "foo/bar"))

        self.pump()

        # Nothing happened yet
        self.assertNoResult(test_d)

        # Make sure treq is trying to connect
        clients = self.reactor.tcpClients
        self.assertEqual(len(clients), 1)
        (host, port, factory, _timeout, _bindAddress) = clients[0]
        self.assertEqual(host, "1.2.3.4")
        self.assertEqual(port, 8008)

        # complete the connection and wire it up to a fake transport
        protocol = factory.buildProtocol(None)
        transport = StringTransport()
        protocol.makeConnection(transport)

        # that should have made it send the request to the transport
        self.assertRegex(transport.value(), b"^GET /foo/bar")
        self.assertRegex(transport.value(), b"Host: testserv:8008")

        # Deferred is still without a result
        self.assertNoResult(test_d)

        # Send it the HTTP response
        protocol.dataReceived(
            b"HTTP/1.1 200 OK\r\n"
            b"Server: Fake\r\n"
            b"Content-Type: application/json\r\n"
            b"Content-Length: %i\r\n"
            b"\r\n"
            b"%s" % (len(return_value), return_value)
        )

        self.pump()

        f = self.failureResultOf(test_d)
        self.assertIsInstance(f.value, RequestSendFailed)