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Fix idna and ipv6 literal handling in MatrixFederationAgent (#4487)

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Turns out that the library does a better job of parsing URIs than our
reinvented wheel. Who knew.

There are two things going on here. The first is that, unlike
parse_server_name, URI.fromBytes will strip off square brackets from IPv6
literals, which means that it is valid input to ClientTLSOptionsFactory and
HostnameEndpoint.

The second is that we stay in `bytes` throughout (except for the argument to
ClientTLSOptionsFactory), which avoids the weirdness of (sometimes) ending up
with idna-encoded values being held in `unicode` variables. TBH it probably
would have been ok but it made the tests fragile.
This commit is contained in:
Richard van der Hoff 2019-01-28 09:56:59 +00:00 committed by GitHub
parent b6dce9b9fd
commit d840019192
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3 changed files with 193 additions and 12 deletions
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1
changelog.d/4487.misc Normal file
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@ -0,0 +1 @@
Fix idna and ipv6 literal handling in MatrixFederationAgent

23
synapse/http/federation/matrix_federation_agent.py
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@ -22,7 +22,6 @@ from twisted.web.client import URI, Agent, HTTPConnectionPool
from twisted.web.http_headers import Headers
from twisted.web.iweb import IAgent
from synapse.http.endpoint import parse_server_name
from synapse.http.federation.srv_resolver import SrvResolver, pick_server_from_list
from synapse.util.logcontext import make_deferred_yieldable
@ -87,9 +86,7 @@ class MatrixFederationAgent(object):
from being sent).
"""
parsed_uri = URI.fromBytes(uri)
server_name_bytes = parsed_uri.netloc
host, port = parse_server_name(server_name_bytes.decode("ascii"))
parsed_uri = URI.fromBytes(uri, defaultPort=-1)
# XXX disabling TLS is really only supported here for the benefit of the
# unit tests. We should make the UTs cope with TLS rather than having to make
@ -97,16 +94,20 @@ class MatrixFederationAgent(object):
if self._tls_client_options_factory is None:
tls_options = None
else:
tls_options = self._tls_client_options_factory.get_options(host)
tls_options = self._tls_client_options_factory.get_options(
parsed_uri.host.decode("ascii")
)
if port is not None:
target = (host, port)
if parsed_uri.port != -1:
# there was an explicit port in the URI
target = parsed_uri.host, parsed_uri.port
else:
service_name = b"_matrix._tcp.%s" % (server_name_bytes, )
service_name = b"_matrix._tcp.%s" % (parsed_uri.host, )
server_list = yield self._srv_resolver.resolve_service(service_name)
if not server_list:
target = (host, 8448)
logger.debug("No SRV record for %s, using %s", host, target)
target = (parsed_uri.host, 8448)
logger.debug(
"No SRV record for %s, using %s", service_name, target)
else:
target = pick_server_from_list(server_list)
@ -117,7 +118,7 @@ class MatrixFederationAgent(object):
headers = headers.copy()
if not headers.hasHeader(b'host'):
headers.addRawHeader(b'host', server_name_bytes)
headers.addRawHeader(b'host', parsed_uri.netloc)
class EndpointFactory(object):
@staticmethod

181
tests/http/federation/test_matrix_federation_agent.py
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@ -209,6 +209,95 @@ class MatrixFederationAgentTests(TestCase):
self.reactor.pump((0.1,))
self.successResultOf(test_d)
def test_get_ipv6_address(self):
"""
Test the behaviour when the server name contains an explicit IPv6 address
(with no port)
"""
# the SRV lookup will return an empty list (XXX: why do we even do an SRV lookup?)
self.mock_resolver.resolve_service.side_effect = lambda _: []
# then there will be a getaddrinfo on the IP
self.reactor.lookups["::1"] = "::1"
test_d = self._make_get_request(b"matrix://[::1]/foo/bar")
# Nothing happened yet
self.assertNoResult(test_d)
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.::1",
)
# 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')
self.assertEqual(port, 8448)
# make a test server, and wire up the client
http_server = self._make_connection(
client_factory,
expected_sni=None,
)
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'[::1]'],
)
# finish the request
request.finish()
self.reactor.pump((0.1,))
self.successResultOf(test_d)
def test_get_ipv6_address_with_port(self):
"""
Test the behaviour when the server name contains an explicit IPv6 address
(with explicit port)
"""
# there will be a getaddrinfo on the IP
self.reactor.lookups["::1"] = "::1"
test_d = self._make_get_request(b"matrix://[::1]:80/foo/bar")
# 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, client_factory, _timeout, _bindAddress) = clients[0]
self.assertEqual(host, '::1')
self.assertEqual(port, 80)
# make a test server, and wire up the client
http_server = self._make_connection(
client_factory,
expected_sni=None,
)
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'[::1]:80'],
)
# finish the request
request.finish()
self.reactor.pump((0.1,))
self.successResultOf(test_d)
def test_get_hostname_no_srv(self):
"""
Test the behaviour when the server name has no port, and no SRV record
@ -258,7 +347,7 @@ class MatrixFederationAgentTests(TestCase):
Test the behaviour when there is a single SRV record
"""
self.mock_resolver.resolve_service.side_effect = lambda _: [
Server(host="srvtarget", port=8443)
Server(host=b"srvtarget", port=8443)
]
self.reactor.lookups["srvtarget"] = "1.2.3.4"
@ -298,6 +387,96 @@ class MatrixFederationAgentTests(TestCase):
self.reactor.pump((0.1,))
self.successResultOf(test_d)
def test_idna_servername(self):
"""test the behaviour when the server name has idna chars in"""
self.mock_resolver.resolve_service.side_effect = lambda _: []
# hostnameendpoint does the lookup on the unicode value (getaddrinfo encodes
# it back to idna)
self.reactor.lookups[u"bücher.com"] = "1.2.3.4"
# this is idna for bücher.com
test_d = self._make_get_request(b"matrix://xn--bcher-kva.com/foo/bar")
# Nothing happened yet
self.assertNoResult(test_d)
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._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, 8448)
# 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(self):
"""test the behaviour when the target of a SRV record has idna chars"""
self.mock_resolver.resolve_service.side_effect = lambda _: [
Server(host=b"xn--trget-3qa.com", port=8443) # târget.com
]
self.reactor.lookups[u"târget.com"] = "1.2.3.4"
test_d = self._make_get_request(b"matrix://xn--bcher-kva.com/foo/bar")
# Nothing happened yet
self.assertNoResult(test_d)
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._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 _check_logcontext(context):
current = LoggingContext.current_context()