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Add MSC4040 matrix-fed service lookups (#16137)

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Travis Ralston 2023-09-05 13:45:39 -06:00 committed by GitHub
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commit b1d71c687a
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4 changed files with 331 additions and 34 deletions
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1
changelog.d/16137.feature Normal file
View file

@ -0,0 +1 @@
Support resolving homeservers using `matrix-fed` DNS SRV records from [MSC4040](https://github.com/matrix-org/matrix-spec-proposals/pull/4040).

12
scripts-dev/federation_client.py
View file

@ -329,6 +329,17 @@ class MatrixConnectionAdapter(HTTPAdapter):
raise ValueError("Invalid host:port '%s'" % (server_name,))
return out[0], port, out[0]
# Look up SRV for Matrix 1.8 `matrix-fed` service first
try:
srv = srvlookup.lookup("matrix-fed", "tcp", server_name)[0]
print(
f"SRV lookup on _matrix-fed._tcp.{server_name} gave {srv}",
file=sys.stderr,
)
return srv.host, srv.port, server_name
except Exception:
pass
# Fall back to deprecated `matrix` service
try:
srv = srvlookup.lookup("matrix", "tcp", server_name)[0]
print(
@ -337,6 +348,7 @@ class MatrixConnectionAdapter(HTTPAdapter):
)
return srv.host, srv.port, server_name
except Exception:
# Fall even further back to just port 8448
return server_name, 8448, server_name
@staticmethod

29
synapse/http/federation/matrix_federation_agent.py
View file

@ -399,15 +399,34 @@ class MatrixHostnameEndpoint:
if port or _is_ip_literal(host):
return [Server(host, port or 8448)]
# Check _matrix-fed._tcp SRV record.
logger.debug("Looking up SRV record for %s", host.decode(errors="replace"))
server_list = await self._srv_resolver.resolve_service(
b"_matrix-fed._tcp." + host
)
if server_list:
if logger.isEnabledFor(logging.DEBUG):
logger.debug(
"Got %s from SRV lookup for %s",
", ".join(map(str, server_list)),
host.decode(errors="replace"),
)
return server_list
# No _matrix-fed._tcp SRV record, fallback to legacy _matrix._tcp SRV record.
logger.debug(
"Looking up deprecated SRV record for %s", host.decode(errors="replace")
)
server_list = await self._srv_resolver.resolve_service(b"_matrix._tcp." + host)
if server_list:
logger.debug(
"Got %s from SRV lookup for %s",
", ".join(map(str, server_list)),
host.decode(errors="replace"),
)
if logger.isEnabledFor(logging.DEBUG):
logger.debug(
"Got %s from deprecated SRV lookup for %s",
", ".join(map(str, server_list)),
host.decode(errors="replace"),
)
return server_list
# No SRV records, so we fallback to host and 8448

323
tests/http/federation/test_matrix_federation_agent.py
View file

@ -15,7 +15,7 @@ import base64
import logging
import os
from typing import Generator, List, Optional, cast
from unittest.mock import AsyncMock, patch
from unittest.mock import AsyncMock, call, patch
import treq
from netaddr import IPSet
@ -651,9 +651,9 @@ class MatrixFederationAgentTests(unittest.TestCase):
# .well-known request fails.
self.reactor.pump((0.4,))
# now there should be a SRV lookup
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.testserv1"
# now there should be two SRV lookups
self.mock_resolver.resolve_service.assert_has_calls(
[call(b"_matrix-fed._tcp.testserv1"), call(b"_matrix._tcp.testserv1")]
)
# we should fall back to a direct connection
@ -737,9 +737,9 @@ class MatrixFederationAgentTests(unittest.TestCase):
# .well-known request fails.
self.reactor.pump((0.4,))
# now there should be a SRV lookup
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.testserv"
# now there should be two SRV lookups
self.mock_resolver.resolve_service.assert_has_calls(
[call(b"_matrix-fed._tcp.testserv"), call(b"_matrix._tcp.testserv")]
)
# we should fall back to a direct connection
@ -788,9 +788,12 @@ class MatrixFederationAgentTests(unittest.TestCase):
content=b'{ "m.server": "target-server" }',
)
# there should be a SRV lookup
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.target-server"
# there should be two SRV lookups
self.mock_resolver.resolve_service.assert_has_calls(
[
call(b"_matrix-fed._tcp.target-server"),
call(b"_matrix._tcp.target-server"),
]
)
# now we should get a connection to the target server
@ -878,9 +881,12 @@ class MatrixFederationAgentTests(unittest.TestCase):
self.reactor.pump((0.1,))
# there should be a SRV lookup
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.target-server"
# there should be two SRV lookups
self.mock_resolver.resolve_service.assert_has_calls(
[
call(b"_matrix-fed._tcp.target-server"),
call(b"_matrix._tcp.target-server"),
]
)
# now we should get a connection to the target server
@ -942,9 +948,9 @@ class MatrixFederationAgentTests(unittest.TestCase):
client_factory, expected_sni=b"testserv", content=b"NOT JSON"
)
# now there should be a SRV lookup
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.testserv"
# now there should be two SRV lookups
self.mock_resolver.resolve_service.assert_has_calls(
[call(b"_matrix-fed._tcp.testserv"), call(b"_matrix._tcp.testserv")]
)
# we should fall back to a direct connection
@ -1016,14 +1022,14 @@ class MatrixFederationAgentTests(unittest.TestCase):
# there should be no requests
self.assertEqual(len(http_proto.requests), 0)
# and there should be a SRV lookup instead
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.testserv"
# and there should be two SRV lookups instead
self.mock_resolver.resolve_service.assert_has_calls(
[call(b"_matrix-fed._tcp.testserv"), call(b"_matrix._tcp.testserv")]
)
def test_get_hostname_srv(self) -> None:
"""
Test the behaviour when there is a single SRV record
Test the behaviour when there is a single SRV record for _matrix-fed.
"""
self.agent = self._make_agent()
@ -1039,7 +1045,51 @@ class MatrixFederationAgentTests(unittest.TestCase):
# the request for a .well-known will have failed with a DNS lookup error.
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.testserv"
b"_matrix-fed._tcp.testserv"
)
# Make sure treq is trying to connect
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, client_factory, _timeout, _bindAddress) = clients[0]
self.assertEqual(host, "1.2.3.4")
self.assertEqual(port, 8443)
# make a test server, and wire up the client
http_server = self._make_connection(client_factory, expected_sni=b"testserv")
self.assertEqual(len(http_server.requests), 1)
request = http_server.requests[0]
self.assertEqual(request.method, b"GET")
self.assertEqual(request.path, b"/foo/bar")
self.assertEqual(request.requestHeaders.getRawHeaders(b"host"), [b"testserv"])
# finish the request
request.finish()
self.reactor.pump((0.1,))
self.successResultOf(test_d)
def test_get_hostname_srv_legacy(self) -> None:
"""
Test the behaviour when there is a single SRV record for _matrix.
"""
self.agent = self._make_agent()
# Return no entries for the _matrix-fed lookup, and a response for _matrix.
self.mock_resolver.resolve_service.side_effect = [
[],
[Server(host=b"srvtarget", port=8443)],
]
self.reactor.lookups["srvtarget"] = "1.2.3.4"
test_d = self._make_get_request(b"matrix-federation://testserv/foo/bar")
# Nothing happened yet
self.assertNoResult(test_d)
# the request for a .well-known will have failed with a DNS lookup error.
self.mock_resolver.resolve_service.assert_has_calls(
[call(b"_matrix-fed._tcp.testserv"), call(b"_matrix._tcp.testserv")]
)
# Make sure treq is trying to connect
@ -1065,7 +1115,7 @@ class MatrixFederationAgentTests(unittest.TestCase):
def test_get_well_known_srv(self) -> None:
"""Test the behaviour when the .well-known redirects to a place where there
is a SRV.
is a _matrix-fed SRV record.
"""
self.agent = self._make_agent()
@ -1096,7 +1146,72 @@ class MatrixFederationAgentTests(unittest.TestCase):
# there should be a SRV lookup
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.target-server"
b"_matrix-fed._tcp.target-server"
)
# now we should get a connection to the target of the SRV record
self.assertEqual(len(clients), 2)
(host, port, client_factory, _timeout, _bindAddress) = clients[1]
self.assertEqual(host, "5.6.7.8")
self.assertEqual(port, 8443)
# make a test server, and wire up the client
http_server = self._make_connection(
client_factory, expected_sni=b"target-server"
)
self.assertEqual(len(http_server.requests), 1)
request = http_server.requests[0]
self.assertEqual(request.method, b"GET")
self.assertEqual(request.path, b"/foo/bar")
self.assertEqual(
request.requestHeaders.getRawHeaders(b"host"), [b"target-server"]
)
# finish the request
request.finish()
self.reactor.pump((0.1,))
self.successResultOf(test_d)
def test_get_well_known_srv_legacy(self) -> None:
"""Test the behaviour when the .well-known redirects to a place where there
is a _matrix SRV record.
"""
self.agent = self._make_agent()
self.reactor.lookups["testserv"] = "1.2.3.4"
self.reactor.lookups["srvtarget"] = "5.6.7.8"
test_d = self._make_get_request(b"matrix-federation://testserv/foo/bar")
# Nothing happened yet
self.assertNoResult(test_d)
# there should be an attempt to connect on port 443 for the .well-known
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, client_factory, _timeout, _bindAddress) = clients[0]
self.assertEqual(host, "1.2.3.4")
self.assertEqual(port, 443)
# Return no entries for the _matrix-fed lookup, and a response for _matrix.
self.mock_resolver.resolve_service.side_effect = [
[],
[Server(host=b"srvtarget", port=8443)],
]
self._handle_well_known_connection(
client_factory,
expected_sni=b"testserv",
content=b'{ "m.server": "target-server" }',
)
# there should be two SRV lookups
self.mock_resolver.resolve_service.assert_has_calls(
[
call(b"_matrix-fed._tcp.target-server"),
call(b"_matrix._tcp.target-server"),
]
)
# now we should get a connection to the target of the SRV record
@ -1158,8 +1273,11 @@ class MatrixFederationAgentTests(unittest.TestCase):
self.reactor.pump((0.4,))
# now there should have been a SRV lookup
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.xn--bcher-kva.com"
self.mock_resolver.resolve_service.assert_has_calls(
[
call(b"_matrix-fed._tcp.xn--bcher-kva.com"),
call(b"_matrix._tcp.xn--bcher-kva.com"),
]
)
# We should fall back to port 8448
@ -1188,7 +1306,7 @@ class MatrixFederationAgentTests(unittest.TestCase):
self.successResultOf(test_d)
def test_idna_srv_target(self) -> None:
"""test the behaviour when the target of a SRV record has idna chars"""
"""test the behaviour when the target of a _matrix-fed SRV record has idna chars"""
self.agent = self._make_agent()
self.mock_resolver.resolve_service.return_value = [
@ -1204,7 +1322,57 @@ class MatrixFederationAgentTests(unittest.TestCase):
self.assertNoResult(test_d)
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.xn--bcher-kva.com"
b"_matrix-fed._tcp.xn--bcher-kva.com"
)
# Make sure treq is trying to connect
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, client_factory, _timeout, _bindAddress) = clients[0]
self.assertEqual(host, "1.2.3.4")
self.assertEqual(port, 8443)
# make a test server, and wire up the client
http_server = self._make_connection(
client_factory, expected_sni=b"xn--bcher-kva.com"
)
self.assertEqual(len(http_server.requests), 1)
request = http_server.requests[0]
self.assertEqual(request.method, b"GET")
self.assertEqual(request.path, b"/foo/bar")
self.assertEqual(
request.requestHeaders.getRawHeaders(b"host"), [b"xn--bcher-kva.com"]
)
# finish the request
request.finish()
self.reactor.pump((0.1,))
self.successResultOf(test_d)
def test_idna_srv_target_legacy(self) -> None:
"""test the behaviour when the target of a _matrix SRV record has idna chars"""
self.agent = self._make_agent()
# Return no entries for the _matrix-fed lookup, and a response for _matrix.
self.mock_resolver.resolve_service.side_effect = [
[],
[Server(host=b"xn--trget-3qa.com", port=8443)],
] # târget.com
self.reactor.lookups["xn--trget-3qa.com"] = "1.2.3.4"
test_d = self._make_get_request(
b"matrix-federation://xn--bcher-kva.com/foo/bar"
)
# Nothing happened yet
self.assertNoResult(test_d)
self.mock_resolver.resolve_service.assert_has_calls(
[
call(b"_matrix-fed._tcp.xn--bcher-kva.com"),
call(b"_matrix._tcp.xn--bcher-kva.com"),
]
)
# Make sure treq is trying to connect
@ -1394,7 +1562,7 @@ class MatrixFederationAgentTests(unittest.TestCase):
self.assertIsNone(r.delegated_server)
def test_srv_fallbacks(self) -> None:
"""Test that other SRV results are tried if the first one fails."""
"""Test that other SRV results are tried if the first one fails for _matrix-fed SRV."""
self.agent = self._make_agent()
self.mock_resolver.resolve_service.return_value = [
@ -1409,7 +1577,7 @@ class MatrixFederationAgentTests(unittest.TestCase):
self.assertNoResult(test_d)
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.testserv"
b"_matrix-fed._tcp.testserv"
)
# We should see an attempt to connect to the first server
@ -1449,6 +1617,103 @@ class MatrixFederationAgentTests(unittest.TestCase):
self.reactor.pump((0.1,))
self.successResultOf(test_d)
def test_srv_fallbacks_legacy(self) -> None:
"""Test that other SRV results are tried if the first one fails for _matrix SRV."""
self.agent = self._make_agent()
# Return no entries for the _matrix-fed lookup, and a response for _matrix.
self.mock_resolver.resolve_service.side_effect = [
[],
[
Server(host=b"target.com", port=8443),
Server(host=b"target.com", port=8444),
],
]
self.reactor.lookups["target.com"] = "1.2.3.4"
test_d = self._make_get_request(b"matrix-federation://testserv/foo/bar")
# Nothing happened yet
self.assertNoResult(test_d)
self.mock_resolver.resolve_service.assert_has_calls(
[call(b"_matrix-fed._tcp.testserv"), call(b"_matrix._tcp.testserv")]
)
# We should see an attempt to connect to the first server
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, client_factory, _timeout, _bindAddress) = clients.pop(0)
self.assertEqual(host, "1.2.3.4")
self.assertEqual(port, 8443)
# Fonx the connection
client_factory.clientConnectionFailed(None, Exception("nope"))
# There's a 300ms delay in HostnameEndpoint
self.reactor.pump((0.4,))
# Hasn't failed yet
self.assertNoResult(test_d)
# We shouldnow see an attempt to connect to the second server
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, client_factory, _timeout, _bindAddress) = clients.pop(0)
self.assertEqual(host, "1.2.3.4")
self.assertEqual(port, 8444)
# make a test server, and wire up the client
http_server = self._make_connection(client_factory, expected_sni=b"testserv")
self.assertEqual(len(http_server.requests), 1)
request = http_server.requests[0]
self.assertEqual(request.method, b"GET")
self.assertEqual(request.path, b"/foo/bar")
self.assertEqual(request.requestHeaders.getRawHeaders(b"host"), [b"testserv"])
# finish the request
request.finish()
self.reactor.pump((0.1,))
self.successResultOf(test_d)
def test_srv_no_fallback_to_legacy(self) -> None:
"""Test that _matrix SRV results are not tried if the _matrix-fed one fails."""
self.agent = self._make_agent()
# Return a failing entry for _matrix-fed.
self.mock_resolver.resolve_service.side_effect = [
[Server(host=b"target.com", port=8443)],
[],
]
self.reactor.lookups["target.com"] = "1.2.3.4"
test_d = self._make_get_request(b"matrix-federation://testserv/foo/bar")
# Nothing happened yet
self.assertNoResult(test_d)
# Only the _matrix-fed is checked, _matrix is ignored.
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix-fed._tcp.testserv"
)
# We should see an attempt to connect to the first server
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, client_factory, _timeout, _bindAddress) = clients.pop(0)
self.assertEqual(host, "1.2.3.4")
self.assertEqual(port, 8443)
# Fonx the connection
client_factory.clientConnectionFailed(None, Exception("nope"))
# There's a 300ms delay in HostnameEndpoint
self.reactor.pump((0.4,))
# Failed to resolve a server.
self.assertFailure(test_d, Exception)
class TestCachePeriodFromHeaders(unittest.TestCase):
def test_cache_control(self) -> None: