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Fix IP URL previews on Python 3 (#4215)

This commit is contained in:
Amber Brown 2018-12-22 01:56:13 +11:00 committed by GitHub
parent c26f49a664
commit ea6abf6724
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8 changed files with 596 additions and 278 deletions
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1
.coveragerc
View File

@ -9,4 +9,3 @@ source=
[report]
precision = 2
ignore_errors = True

2
.gitignore vendored
View File

@ -59,7 +59,5 @@ env/
.vscode/
.ropeproject/
*.deb
/debs

1
changelog.d/4215.misc Normal file
View File

@ -0,0 +1 @@
Getting URL previews of IP addresses no longer fails on Python 3.

367
synapse/http/client.py
View File

@ -21,28 +21,25 @@ from six.moves import urllib
import treq
from canonicaljson import encode_canonical_json, json
from netaddr import IPAddress
from prometheus_client import Counter
from zope.interface import implementer, provider
from OpenSSL import SSL
from OpenSSL.SSL import VERIFY_NONE
from twisted.internet import defer, protocol, reactor, ssl
from twisted.internet.endpoints import HostnameEndpoint, wrapClientTLS
from twisted.web._newclient import ResponseDone
from twisted.web.client import (
Agent,
BrowserLikeRedirectAgent,
ContentDecoderAgent,
GzipDecoder,
HTTPConnectionPool,
PartialDownloadError,
readBody,
from twisted.internet import defer, protocol, ssl
from twisted.internet.interfaces import (
IReactorPluggableNameResolver,
IResolutionReceiver,
)
from twisted.python.failure import Failure
from twisted.web._newclient import ResponseDone
from twisted.web.client import Agent, HTTPConnectionPool, PartialDownloadError, readBody
from twisted.web.http import PotentialDataLoss
from twisted.web.http_headers import Headers
from synapse.api.errors import Codes, HttpResponseException, SynapseError
from synapse.http import cancelled_to_request_timed_out_error, redact_uri
from synapse.http.endpoint import SpiderEndpoint
from synapse.util.async_helpers import timeout_deferred
from synapse.util.caches import CACHE_SIZE_FACTOR
from synapse.util.logcontext import make_deferred_yieldable
@ -50,8 +47,125 @@ from synapse.util.logcontext import make_deferred_yieldable
logger = logging.getLogger(__name__)
outgoing_requests_counter = Counter("synapse_http_client_requests", "", ["method"])
incoming_responses_counter = Counter("synapse_http_client_responses", "",
["method", "code"])
incoming_responses_counter = Counter(
"synapse_http_client_responses", "", ["method", "code"]
)
def check_against_blacklist(ip_address, ip_whitelist, ip_blacklist):
"""
Args:
ip_address (netaddr.IPAddress)
ip_whitelist (netaddr.IPSet)
ip_blacklist (netaddr.IPSet)
"""
if ip_address in ip_blacklist:
if ip_whitelist is None or ip_address not in ip_whitelist:
return True
return False
class IPBlacklistingResolver(object):
"""
A proxy for reactor.nameResolver which only produces non-blacklisted IP
addresses, preventing DNS rebinding attacks on URL preview.
"""
def __init__(self, reactor, ip_whitelist, ip_blacklist):
"""
Args:
reactor (twisted.internet.reactor)
ip_whitelist (netaddr.IPSet)
ip_blacklist (netaddr.IPSet)
"""
self._reactor = reactor
self._ip_whitelist = ip_whitelist
self._ip_blacklist = ip_blacklist
def resolveHostName(self, recv, hostname, portNumber=0):
r = recv()
d = defer.Deferred()
addresses = []
@provider(IResolutionReceiver)
class EndpointReceiver(object):
@staticmethod
def resolutionBegan(resolutionInProgress):
pass
@staticmethod
def addressResolved(address):
ip_address = IPAddress(address.host)
if check_against_blacklist(
ip_address, self._ip_whitelist, self._ip_blacklist
):
logger.info(
"Dropped %s from DNS resolution to %s" % (ip_address, hostname)
)
raise SynapseError(403, "IP address blocked by IP blacklist entry")
addresses.append(address)
@staticmethod
def resolutionComplete():
d.callback(addresses)
self._reactor.nameResolver.resolveHostName(
EndpointReceiver, hostname, portNumber=portNumber
)
def _callback(addrs):
r.resolutionBegan(None)
for i in addrs:
r.addressResolved(i)
r.resolutionComplete()
d.addCallback(_callback)
return r
class BlacklistingAgentWrapper(Agent):
"""
An Agent wrapper which will prevent access to IP addresses being accessed
directly (without an IP address lookup).
"""
def __init__(self, agent, reactor, ip_whitelist=None, ip_blacklist=None):
"""
Args:
agent (twisted.web.client.Agent): The Agent to wrap.
reactor (twisted.internet.reactor)
ip_whitelist (netaddr.IPSet)
ip_blacklist (netaddr.IPSet)
"""
self._agent = agent
self._ip_whitelist = ip_whitelist
self._ip_blacklist = ip_blacklist
def request(self, method, uri, headers=None, bodyProducer=None):
h = urllib.parse.urlparse(uri.decode('ascii'))
try:
ip_address = IPAddress(h.hostname)
if check_against_blacklist(
ip_address, self._ip_whitelist, self._ip_blacklist
):
logger.info(
"Blocking access to %s because of blacklist" % (ip_address,)
)
e = SynapseError(403, "IP address blocked by IP blacklist entry")
return defer.fail(Failure(e))
except Exception:
# Not an IP
pass
return self._agent.request(
method, uri, headers=headers, bodyProducer=bodyProducer
)
class SimpleHttpClient(object):
@ -59,14 +173,54 @@ class SimpleHttpClient(object):
A simple, no-frills HTTP client with methods that wrap up common ways of
using HTTP in Matrix
"""
def __init__(self, hs):
def __init__(self, hs, treq_args={}, ip_whitelist=None, ip_blacklist=None):
"""
Args:
hs (synapse.server.HomeServer)
treq_args (dict): Extra keyword arguments to be given to treq.request.
ip_blacklist (netaddr.IPSet): The IP addresses that are blacklisted that
we may not request.
ip_whitelist (netaddr.IPSet): The whitelisted IP addresses, that we can
request if it were otherwise caught in a blacklist.
"""
self.hs = hs
pool = HTTPConnectionPool(reactor)
self._ip_whitelist = ip_whitelist
self._ip_blacklist = ip_blacklist
self._extra_treq_args = treq_args
self.user_agent = hs.version_string
self.clock = hs.get_clock()
if hs.config.user_agent_suffix:
self.user_agent = "%s %s" % (self.user_agent, hs.config.user_agent_suffix)
self.user_agent = self.user_agent.encode('ascii')
if self._ip_blacklist:
real_reactor = hs.get_reactor()
# If we have an IP blacklist, we need to use a DNS resolver which
# filters out blacklisted IP addresses, to prevent DNS rebinding.
nameResolver = IPBlacklistingResolver(
real_reactor, self._ip_whitelist, self._ip_blacklist
)
@implementer(IReactorPluggableNameResolver)
class Reactor(object):
def __getattr__(_self, attr):
if attr == "nameResolver":
return nameResolver
else:
return getattr(real_reactor, attr)
self.reactor = Reactor()
else:
self.reactor = hs.get_reactor()
# the pusher makes lots of concurrent SSL connections to sygnal, and
# tends to do so in batches, so we need to allow the pool to keep lots
# of idle connections around.
# tends to do so in batches, so we need to allow the pool to keep
# lots of idle connections around.
pool = HTTPConnectionPool(self.reactor)
pool.maxPersistentPerHost = max((100 * CACHE_SIZE_FACTOR, 5))
pool.cachedConnectionTimeout = 2 * 60
@ -74,20 +228,35 @@ class SimpleHttpClient(object):
# BrowserLikePolicyForHTTPS which will do regular cert validation
# 'like a browser'
self.agent = Agent(
reactor,
self.reactor,
connectTimeout=15,
contextFactory=hs.get_http_client_context_factory(),
contextFactory=self.hs.get_http_client_context_factory(),
pool=pool,
)
self.user_agent = hs.version_string
self.clock = hs.get_clock()
if hs.config.user_agent_suffix:
self.user_agent = "%s %s" % (self.user_agent, hs.config.user_agent_suffix,)
self.user_agent = self.user_agent.encode('ascii')
if self._ip_blacklist:
# If we have an IP blacklist, we then install the blacklisting Agent
# which prevents direct access to IP addresses, that are not caught
# by the DNS resolution.
self.agent = BlacklistingAgentWrapper(
self.agent,
self.reactor,
ip_whitelist=self._ip_whitelist,
ip_blacklist=self._ip_blacklist,
)
@defer.inlineCallbacks
def request(self, method, uri, data=b'', headers=None):
"""
Args:
method (str): HTTP method to use.
uri (str): URI to query.
data (bytes): Data to send in the request body, if applicable.
headers (t.w.http_headers.Headers): Request headers.
Raises:
SynapseError: If the IP is blacklisted.
"""
# A small wrapper around self.agent.request() so we can easily attach
# counters to it
outgoing_requests_counter.labels(method).inc()
@ -97,25 +266,34 @@ class SimpleHttpClient(object):
try:
request_deferred = treq.request(
method, uri, agent=self.agent, data=data, headers=headers
method,
uri,
agent=self.agent,
data=data,
headers=headers,
**self._extra_treq_args
)
request_deferred = timeout_deferred(
request_deferred, 60, self.hs.get_reactor(),
request_deferred,
60,
self.hs.get_reactor(),
cancelled_to_request_timed_out_error,
)
response = yield make_deferred_yieldable(request_deferred)
incoming_responses_counter.labels(method, response.code).inc()
logger.info(
"Received response to %s %s: %s",
method, redact_uri(uri), response.code
"Received response to %s %s: %s", method, redact_uri(uri), response.code
)
defer.returnValue(response)
except Exception as e:
incoming_responses_counter.labels(method, "ERR").inc()
logger.info(
"Error sending request to %s %s: %s %s",
method, redact_uri(uri), type(e).__name__, e.args[0]
method,
redact_uri(uri),
type(e).__name__,
e.args[0],
)
raise
@ -140,8 +318,9 @@ class SimpleHttpClient(object):
# TODO: Do we ever want to log message contents?
logger.debug("post_urlencoded_get_json args: %s", args)
query_bytes = urllib.parse.urlencode(
encode_urlencode_args(args), True).encode("utf8")
query_bytes = urllib.parse.urlencode(encode_urlencode_args(args), True).encode(
"utf8"
)
actual_headers = {
b"Content-Type": [b"application/x-www-form-urlencoded"],
@ -151,10 +330,7 @@ class SimpleHttpClient(object):
actual_headers.update(headers)
response = yield self.request(
"POST",
uri,
headers=Headers(actual_headers),
data=query_bytes
"POST", uri, headers=Headers(actual_headers), data=query_bytes
)
if 200 <= response.code < 300:
@ -193,10 +369,7 @@ class SimpleHttpClient(object):
actual_headers.update(headers)
response = yield self.request(
"POST",
uri,
headers=Headers(actual_headers),
data=json_str
"POST", uri, headers=Headers(actual_headers), data=json_str
)
body = yield make_deferred_yieldable(readBody(response))
@ -264,10 +437,7 @@ class SimpleHttpClient(object):
actual_headers.update(headers)
response = yield self.request(
"PUT",
uri,
headers=Headers(actual_headers),
data=json_str
"PUT", uri, headers=Headers(actual_headers), data=json_str
)
body = yield make_deferred_yieldable(readBody(response))
@ -299,17 +469,11 @@ class SimpleHttpClient(object):
query_bytes = urllib.parse.urlencode(args, True)
uri = "%s?%s" % (uri, query_bytes)
actual_headers = {
b"User-Agent": [self.user_agent],
}
actual_headers = {b"User-Agent": [self.user_agent]}
if headers:
actual_headers.update(headers)
response = yield self.request(
"GET",
uri,
headers=Headers(actual_headers),
)
response = yield self.request("GET", uri, headers=Headers(actual_headers))
body = yield make_deferred_yieldable(readBody(response))
@ -334,22 +498,18 @@ class SimpleHttpClient(object):
headers, absolute URI of the response and HTTP response code.
"""
actual_headers = {
b"User-Agent": [self.user_agent],
}
actual_headers = {b"User-Agent": [self.user_agent]}
if headers:
actual_headers.update(headers)
response = yield self.request(
"GET",
url,
headers=Headers(actual_headers),
)
response = yield self.request("GET", url, headers=Headers(actual_headers))
resp_headers = dict(response.headers.getAllRawHeaders())
if (b'Content-Length' in resp_headers and
int(resp_headers[b'Content-Length']) > max_size):
if (
b'Content-Length' in resp_headers
and int(resp_headers[b'Content-Length'][0]) > max_size
):
logger.warn("Requested URL is too large > %r bytes" % (self.max_size,))
raise SynapseError(
502,
@ -359,26 +519,20 @@ class SimpleHttpClient(object):
if response.code > 299:
logger.warn("Got %d when downloading %s" % (response.code, url))
raise SynapseError(
502,
"Got error %d" % (response.code,),
Codes.UNKNOWN,
)
raise SynapseError(502, "Got error %d" % (response.code,), Codes.UNKNOWN)
# TODO: if our Content-Type is HTML or something, just read the first
# N bytes into RAM rather than saving it all to disk only to read it
# straight back in again
try:
length = yield make_deferred_yieldable(_readBodyToFile(
response, output_stream, max_size,
))
length = yield make_deferred_yieldable(
_readBodyToFile(response, output_stream, max_size)
)
except Exception as e:
logger.exception("Failed to download body")
raise SynapseError(
502,
("Failed to download remote body: %s" % e),
Codes.UNKNOWN,
502, ("Failed to download remote body: %s" % e), Codes.UNKNOWN
)
defer.returnValue(
@ -387,13 +541,14 @@ class SimpleHttpClient(object):
resp_headers,
response.request.absoluteURI.decode('ascii'),
response.code,
),
)
)
# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
# The two should be factored out.
class _ReadBodyToFileProtocol(protocol.Protocol):
def __init__(self, stream, deferred, max_size):
self.stream = stream
@ -405,11 +560,13 @@ class _ReadBodyToFileProtocol(protocol.Protocol):
self.stream.write(data)
self.length += len(data)
if self.max_size is not None and self.length >= self.max_size:
self.deferred.errback(SynapseError(
self.deferred.errback(
SynapseError(
502,
"Requested file is too large > %r bytes" % (self.max_size,),
Codes.TOO_LARGE,
))
)
)
self.deferred = defer.Deferred()
self.transport.loseConnection()
@ -427,6 +584,7 @@ class _ReadBodyToFileProtocol(protocol.Protocol):
# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
# The two should be factored out.
def _readBodyToFile(response, stream, max_size):
d = defer.Deferred()
response.deliverBody(_ReadBodyToFileProtocol(stream, d, max_size))
@ -449,10 +607,12 @@ class CaptchaServerHttpClient(SimpleHttpClient):
"POST",
url,
data=query_bytes,
headers=Headers({
headers=Headers(
{
b"Content-Type": [b"application/x-www-form-urlencoded"],
b"User-Agent": [self.user_agent],
})
}
),
)
try:
@ -463,57 +623,6 @@ class CaptchaServerHttpClient(SimpleHttpClient):
defer.returnValue(e.response)
class SpiderEndpointFactory(object):
def __init__(self, hs):
self.blacklist = hs.config.url_preview_ip_range_blacklist
self.whitelist = hs.config.url_preview_ip_range_whitelist
self.policyForHTTPS = hs.get_http_client_context_factory()
def endpointForURI(self, uri):
logger.info("Getting endpoint for %s", uri.toBytes())
if uri.scheme == b"http":
endpoint_factory = HostnameEndpoint
elif uri.scheme == b"https":
tlsCreator = self.policyForHTTPS.creatorForNetloc(uri.host, uri.port)
def endpoint_factory(reactor, host, port, **kw):
return wrapClientTLS(
tlsCreator,
HostnameEndpoint(reactor, host, port, **kw))
else:
logger.warn("Can't get endpoint for unrecognised scheme %s", uri.scheme)
return None
return SpiderEndpoint(
reactor, uri.host, uri.port, self.blacklist, self.whitelist,
endpoint=endpoint_factory, endpoint_kw_args=dict(timeout=15),
)
class SpiderHttpClient(SimpleHttpClient):
"""
Separate HTTP client for spidering arbitrary URLs.
Special in that it follows retries and has a UA that looks
like a browser.
used by the preview_url endpoint in the content repo.
"""
def __init__(self, hs):
SimpleHttpClient.__init__(self, hs)
# clobber the base class's agent and UA:
self.agent = ContentDecoderAgent(
BrowserLikeRedirectAgent(
Agent.usingEndpointFactory(
reactor,
SpiderEndpointFactory(hs)
)
), [(b'gzip', GzipDecoder)]
)
# We could look like Chrome:
# self.user_agent = ("Mozilla/5.0 (%s) (KHTML, like Gecko)
# Chrome Safari" % hs.version_string)
def encode_urlencode_args(args):
return {k: encode_urlencode_arg(v) for k, v in args.items()}

35
synapse/http/endpoint.py
View File

@ -218,41 +218,6 @@ class _WrappedConnection(object):
return d
class SpiderEndpoint(object):
"""An endpoint which refuses to connect to blacklisted IP addresses
Implements twisted.internet.interfaces.IStreamClientEndpoint.
"""
def __init__(self, reactor, host, port, blacklist, whitelist,
endpoint=HostnameEndpoint, endpoint_kw_args={}):
self.reactor = reactor
self.host = host
self.port = port
self.blacklist = blacklist
self.whitelist = whitelist
self.endpoint = endpoint
self.endpoint_kw_args = endpoint_kw_args
@defer.inlineCallbacks
def connect(self, protocolFactory):
address = yield self.reactor.resolve(self.host)
from netaddr import IPAddress
ip_address = IPAddress(address)
if ip_address in self.blacklist:
if self.whitelist is None or ip_address not in self.whitelist:
raise ConnectError(
"Refusing to spider blacklisted IP address %s" % address
)
logger.info("Connecting to %s:%s", address, self.port)
endpoint = self.endpoint(
self.reactor, address, self.port, **self.endpoint_kw_args
)
connection = yield endpoint.connect(protocolFactory)
defer.returnValue(connection)
class SRVClientEndpoint(object):
"""An endpoint which looks up SRV records for a service.
Cycles through the list of servers starting with each call to connect

14
synapse/rest/media/v1/preview_url_resource.py
View File

@ -35,7 +35,7 @@ from twisted.web.resource import Resource
from twisted.web.server import NOT_DONE_YET
from synapse.api.errors import Codes, SynapseError
from synapse.http.client import SpiderHttpClient
from synapse.http.client import SimpleHttpClient
from synapse.http.server import (
respond_with_json,
respond_with_json_bytes,
@ -69,7 +69,12 @@ class PreviewUrlResource(Resource):
self.max_spider_size = hs.config.max_spider_size
self.server_name = hs.hostname
self.store = hs.get_datastore()
self.client = SpiderHttpClient(hs)
self.client = SimpleHttpClient(
hs,
treq_args={"browser_like_redirects": True},
ip_whitelist=hs.config.url_preview_ip_range_whitelist,
ip_blacklist=hs.config.url_preview_ip_range_blacklist,
)
self.media_repo = media_repo
self.primary_base_path = media_repo.primary_base_path
self.media_storage = media_storage
@ -318,6 +323,11 @@ class PreviewUrlResource(Resource):
length, headers, uri, code = yield self.client.get_file(
url, output_stream=f, max_size=self.max_spider_size,
)
except SynapseError:
# Pass SynapseErrors through directly, so that the servlet
# handler will return a SynapseError to the client instead of
# blank data or a 500.
raise
except Exception as e:
# FIXME: pass through 404s and other error messages nicely
logger.warn("Error downloading %s: %r", url, e)

440
tests/rest/media/v1/test_url_preview.py
View File

@ -15,21 +15,55 @@
import os
from mock import Mock
import attr
from netaddr import IPSet
from twisted.internet.defer import Deferred
from twisted.internet._resolver import HostResolution
from twisted.internet.address import IPv4Address, IPv6Address
from twisted.internet.error import DNSLookupError
from twisted.python.failure import Failure
from twisted.test.proto_helpers import AccumulatingProtocol
from twisted.web._newclient import ResponseDone
from synapse.config.repository import MediaStorageProviderConfig
from synapse.util.logcontext import make_deferred_yieldable
from synapse.util.module_loader import load_module
from tests import unittest
from tests.server import FakeTransport
@attr.s
class FakeResponse(object):
version = attr.ib()
code = attr.ib()
phrase = attr.ib()
headers = attr.ib()
body = attr.ib()
absoluteURI = attr.ib()
@property
def request(self):
@attr.s
class FakeTransport(object):
absoluteURI = self.absoluteURI
return FakeTransport()
def deliverBody(self, protocol):
protocol.dataReceived(self.body)
protocol.connectionLost(Failure(ResponseDone()))
class URLPreviewTests(unittest.HomeserverTestCase):
hijack_auth = True
user_id = "@test:user"
end_content = (
b'<html><head>'
b'<meta property="og:title" content="~matrix~" />'
b'<meta property="og:description" content="hi" />'
b'</head></html>'
)
def make_homeserver(self, reactor, clock):
@ -39,6 +73,15 @@ class URLPreviewTests(unittest.HomeserverTestCase):
config = self.default_config()
config.url_preview_enabled = True
config.max_spider_size = 9999999
config.url_preview_ip_range_blacklist = IPSet(
(
"192.168.1.1",
"1.0.0.0/8",
"3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff",
"2001:800::/21",
)
)
config.url_preview_ip_range_whitelist = IPSet(("1.1.1.1",))
config.url_preview_url_blacklist = []
config.media_store_path = self.storage_path
@ -62,63 +105,50 @@ class URLPreviewTests(unittest.HomeserverTestCase):
def prepare(self, reactor, clock, hs):
self.fetches = []
def get_file(url, output_stream, max_size):
"""
Returns tuple[int,dict,str,int] of file length, response headers,
absolute URI, and response code.
"""
def write_to(r):
data, response = r
output_stream.write(data)
return response
d = Deferred()
d.addCallback(write_to)
self.fetches.append((d, url))
return make_deferred_yieldable(d)
client = Mock()
client.get_file = get_file
self.media_repo = hs.get_media_repository_resource()
preview_url = self.media_repo.children[b'preview_url']
preview_url.client = client
self.preview_url = preview_url
self.preview_url = self.media_repo.children[b'preview_url']
self.lookups = {}
class Resolver(object):
def resolveHostName(
_self,
resolutionReceiver,
hostName,
portNumber=0,
addressTypes=None,
transportSemantics='TCP',
):
resolution = HostResolution(hostName)
resolutionReceiver.resolutionBegan(resolution)
if hostName not in self.lookups:
raise DNSLookupError("OH NO")
for i in self.lookups[hostName]:
resolutionReceiver.addressResolved(i[0]('TCP', i[1], portNumber))
resolutionReceiver.resolutionComplete()
return resolutionReceiver
self.reactor.nameResolver = Resolver()
def test_cache_returns_correct_type(self):
self.lookups["matrix.org"] = [(IPv4Address, "8.8.8.8")]
request, channel = self.make_request(
"GET", "url_preview?url=matrix.org", shorthand=False
"GET", "url_preview?url=http://matrix.org", shorthand=False
)
request.render(self.preview_url)
self.pump()
# We've made one fetch
self.assertEqual(len(self.fetches), 1)
end_content = (
b'<html><head>'
b'<meta property="og:title" content="~matrix~" />'
b'<meta property="og:description" content="hi" />'
b'</head></html>'
)
self.fetches[0][0].callback(
(
end_content,
(
len(end_content),
{
b"Content-Length": [b"%d" % (len(end_content))],
b"Content-Type": [b'text/html; charset="utf8"'],
},
"https://example.com",
200,
),
)
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\nContent-Type: text/html\r\n\r\n"
% (len(self.end_content),)
+ self.end_content
)
self.pump()
@ -129,14 +159,11 @@ class URLPreviewTests(unittest.HomeserverTestCase):
# Check the cache returns the correct response
request, channel = self.make_request(
"GET", "url_preview?url=matrix.org", shorthand=False
"GET", "url_preview?url=http://matrix.org", shorthand=False
)
request.render(self.preview_url)
self.pump()
# Only one fetch, still, since we'll lean on the cache
self.assertEqual(len(self.fetches), 1)
# Check the cache response has the same content
self.assertEqual(channel.code, 200)
self.assertEqual(
@ -144,20 +171,17 @@ class URLPreviewTests(unittest.HomeserverTestCase):
)
# Clear the in-memory cache
self.assertIn("matrix.org", self.preview_url._cache)
self.preview_url._cache.pop("matrix.org")
self.assertNotIn("matrix.org", self.preview_url._cache)
self.assertIn("http://matrix.org", self.preview_url._cache)
self.preview_url._cache.pop("http://matrix.org")
self.assertNotIn("http://matrix.org", self.preview_url._cache)
# Check the database cache returns the correct response
request, channel = self.make_request(
"GET", "url_preview?url=matrix.org", shorthand=False
"GET", "url_preview?url=http://matrix.org", shorthand=False
)
request.render(self.preview_url)
self.pump()
# Only one fetch, still, since we'll lean on the cache
self.assertEqual(len(self.fetches), 1)
# Check the cache response has the same content
self.assertEqual(channel.code, 200)
self.assertEqual(
@ -165,15 +189,7 @@ class URLPreviewTests(unittest.HomeserverTestCase):
)
def test_non_ascii_preview_httpequiv(self):
request, channel = self.make_request(
"GET", "url_preview?url=matrix.org", shorthand=False
)
request.render(self.preview_url)
self.pump()
# We've made one fetch
self.assertEqual(len(self.fetches), 1)
self.lookups["matrix.org"] = [(IPv4Address, "8.8.8.8")]
end_content = (
b'<html><head>'
@ -183,21 +199,23 @@ class URLPreviewTests(unittest.HomeserverTestCase):
b'</head></html>'
)
self.fetches[0][0].callback(
(
end_content,
(
len(end_content),
{
b"Content-Length": [b"%d" % (len(end_content))],
# This charset=utf-8 should be ignored, because the
# document has a meta tag overriding it.
b"Content-Type": [b'text/html; charset="utf8"'],
},
"https://example.com",
200,
),
request, channel = self.make_request(
"GET", "url_preview?url=http://matrix.org", shorthand=False
)
request.render(self.preview_url)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b"Content-Type: text/html; charset=\"utf8\"\r\n\r\n"
)
% (len(end_content),)
+ end_content
)
self.pump()
@ -205,15 +223,7 @@ class URLPreviewTests(unittest.HomeserverTestCase):
self.assertEqual(channel.json_body["og:title"], u"\u0434\u043a\u0430")
def test_non_ascii_preview_content_type(self):
request, channel = self.make_request(
"GET", "url_preview?url=matrix.org", shorthand=False
)
request.render(self.preview_url)
self.pump()
# We've made one fetch
self.assertEqual(len(self.fetches), 1)
self.lookups["matrix.org"] = [(IPv4Address, "8.8.8.8")]
end_content = (
b'<html><head>'
@ -222,21 +232,239 @@ class URLPreviewTests(unittest.HomeserverTestCase):
b'</head></html>'
)
self.fetches[0][0].callback(
(
end_content,
(
len(end_content),
{
b"Content-Length": [b"%d" % (len(end_content))],
b"Content-Type": [b'text/html; charset="windows-1251"'],
},
"https://example.com",
200,
),
request, channel = self.make_request(
"GET", "url_preview?url=http://matrix.org", shorthand=False
)
request.render(self.preview_url)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b"Content-Type: text/html; charset=\"windows-1251\"\r\n\r\n"
)
% (len(end_content),)
+ end_content
)
self.pump()
self.assertEqual(channel.code, 200)
self.assertEqual(channel.json_body["og:title"], u"\u0434\u043a\u0430")
def test_ipaddr(self):
"""
IP addresses can be previewed directly.
"""
self.lookups["example.com"] = [(IPv4Address, "8.8.8.8")]
request, channel = self.make_request(
"GET", "url_preview?url=http://example.com", shorthand=False
)
request.render(self.preview_url)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\nContent-Type: text/html\r\n\r\n"
% (len(self.end_content),)
+ self.end_content
)
self.pump()
self.assertEqual(channel.code, 200)
self.assertEqual(
channel.json_body, {"og:title": "~matrix~", "og:description": "hi"}
)
def test_blacklisted_ip_specific(self):
"""
Blacklisted IP addresses, found via DNS, are not spidered.
"""
self.lookups["example.com"] = [(IPv4Address, "192.168.1.1")]
request, channel = self.make_request(
"GET", "url_preview?url=http://example.com", shorthand=False
)
request.render(self.preview_url)
self.pump()
# No requests made.
self.assertEqual(len(self.reactor.tcpClients), 0)
self.assertEqual(channel.code, 403)
self.assertEqual(
channel.json_body,
{
'errcode': 'M_UNKNOWN',
'error': 'IP address blocked by IP blacklist entry',
},
)
def test_blacklisted_ip_range(self):
"""
Blacklisted IP ranges, IPs found over DNS, are not spidered.
"""
self.lookups["example.com"] = [(IPv4Address, "1.1.1.2")]
request, channel = self.make_request(
"GET", "url_preview?url=http://example.com", shorthand=False
)
request.render(self.preview_url)
self.pump()
self.assertEqual(channel.code, 403)
self.assertEqual(
channel.json_body,
{
'errcode': 'M_UNKNOWN',
'error': 'IP address blocked by IP blacklist entry',
},
)
def test_blacklisted_ip_specific_direct(self):
"""
Blacklisted IP addresses, accessed directly, are not spidered.
"""
request, channel = self.make_request(
"GET", "url_preview?url=http://192.168.1.1", shorthand=False
)
request.render(self.preview_url)
self.pump()
# No requests made.
self.assertEqual(len(self.reactor.tcpClients), 0)
self.assertEqual(channel.code, 403)
self.assertEqual(
channel.json_body,
{
'errcode': 'M_UNKNOWN',
'error': 'IP address blocked by IP blacklist entry',
},
)
def test_blacklisted_ip_range_direct(self):
"""
Blacklisted IP ranges, accessed directly, are not spidered.
"""
request, channel = self.make_request(
"GET", "url_preview?url=http://1.1.1.2", shorthand=False
)
request.render(self.preview_url)
self.pump()
self.assertEqual(channel.code, 403)
self.assertEqual(
channel.json_body,
{
'errcode': 'M_UNKNOWN',
'error': 'IP address blocked by IP blacklist entry',
},
)
def test_blacklisted_ip_range_whitelisted_ip(self):
"""
Blacklisted but then subsequently whitelisted IP addresses can be
spidered.
"""
self.lookups["example.com"] = [(IPv4Address, "1.1.1.1")]
request, channel = self.make_request(
"GET", "url_preview?url=http://example.com", shorthand=False
)
request.render(self.preview_url)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\nContent-Type: text/html\r\n\r\n"
% (len(self.end_content),)
+ self.end_content
)
self.pump()
self.assertEqual(channel.code, 200)
self.assertEqual(
channel.json_body, {"og:title": "~matrix~", "og:description": "hi"}
)
def test_blacklisted_ip_with_external_ip(self):
"""
If a hostname resolves a blacklisted IP, even if there's a
non-blacklisted one, it will be rejected.
"""
# Hardcode the URL resolving to the IP we want.
self.lookups[u"example.com"] = [
(IPv4Address, "1.1.1.2"),
(IPv4Address, "8.8.8.8"),
]
request, channel = self.make_request(
"GET", "url_preview?url=http://example.com", shorthand=False
)
request.render(self.preview_url)
self.pump()
self.assertEqual(channel.code, 403)
self.assertEqual(
channel.json_body,
{
'errcode': 'M_UNKNOWN',
'error': 'IP address blocked by IP blacklist entry',
},
)
def test_blacklisted_ipv6_specific(self):
"""
Blacklisted IP addresses, found via DNS, are not spidered.
"""
self.lookups["example.com"] = [
(IPv6Address, "3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")
]
request, channel = self.make_request(
"GET", "url_preview?url=http://example.com", shorthand=False
)
request.render(self.preview_url)
self.pump()
# No requests made.
self.assertEqual(len(self.reactor.tcpClients), 0)
self.assertEqual(channel.code, 403)
self.assertEqual(
channel.json_body,
{
'errcode': 'M_UNKNOWN',
'error': 'IP address blocked by IP blacklist entry',
},
)
def test_blacklisted_ipv6_range(self):
"""
Blacklisted IP ranges, IPs found over DNS, are not spidered.
"""
self.lookups["example.com"] = [(IPv6Address, "2001:800::1")]
request, channel = self.make_request(
"GET", "url_preview?url=http://example.com", shorthand=False
)
request.render(self.preview_url)
self.pump()
self.assertEqual(channel.code, 403)
self.assertEqual(
channel.json_body,
{
'errcode': 'M_UNKNOWN',
'error': 'IP address blocked by IP blacklist entry',
},
)

8
tests/server.py
View File

@ -383,8 +383,16 @@ class FakeTransport(object):
self.disconnecting = True
def pauseProducing(self):
if not self.producer:
return
self.producer.pauseProducing()
def resumeProducing(self):
if not self.producer:
return
self.producer.resumeProducing()
def unregisterProducer(self):
if not self.producer:
return