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authorAmber Brown <hawkowl@atleastfornow.net>2018-12-22 01:56:13 +1100
committerGitHub <noreply@github.com>2018-12-22 01:56:13 +1100
commitea6abf6724f4572a709047034fe2a672641068b9 (patch)
treea38de646bb14b8b078523df8361a5614f81bb193 /tests/rest
parentMake the dependencies more like a standard Python project and hook up the opt... (diff)
downloadsynapse-ea6abf6724f4572a709047034fe2a672641068b9.tar.xz
Fix IP URL previews on Python 3 (#4215)
Diffstat (limited to 'tests/rest')
-rw-r--r--tests/rest/media/v1/test_url_preview.py424


1 files changed, 326 insertions, 98 deletions
diff --git a/tests/rest/media/v1/test_url_preview.py b/tests/rest/media/v1/test_url_preview.py
index c62f71b44a..650ce95a6f 100644
--- a/tests/rest/media/v1/test_url_preview.py
+++ b/tests/rest/media/v1/test_url_preview.py
@@ -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 = []
+        self.media_repo = hs.get_media_repository_resource()
+        self.preview_url = self.media_repo.children[b'preview_url']
 
-        def get_file(url, output_stream, max_size):
-            """
-            Returns tuple[int,dict,str,int] of file length, response headers,
-            absolute URI, and response code.
-            """
+        self.lookups = {}
 
-            def write_to(r):
-                data, response = r
-                output_stream.write(data)
-                return response
+        class Resolver(object):
+            def resolveHostName(
+                _self,
+                resolutionReceiver,
+                hostName,
+                portNumber=0,
+                addressTypes=None,
+                transportSemantics='TCP',
+            ):
 
-            d = Deferred()
-            d.addCallback(write_to)
-            self.fetches.append((d, url))
-            return make_deferred_yieldable(d)
+                resolution = HostResolution(hostName)
+                resolutionReceiver.resolutionBegan(resolution)
+                if hostName not in self.lookups:
+                    raise DNSLookupError("OH NO")
 
-        client = Mock()
-        client.get_file = get_file
+                for i in self.lookups[hostName]:
+                    resolutionReceiver.addressResolved(i[0]('TCP', i[1], portNumber))
+                resolutionReceiver.resolutionComplete()
+                return resolutionReceiver
 
-        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.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(
@@ -165,78 +189,282 @@ class URLPreviewTests(unittest.HomeserverTestCase):
         )
 
     def test_non_ascii_preview_httpequiv(self):
+        self.lookups["matrix.org"] = [(IPv4Address, "8.8.8.8")]
+
+        end_content = (
+            b'<html><head>'
+            b'<meta http-equiv="Content-Type" content="text/html; charset=windows-1251"/>'
+            b'<meta property="og:title" content="\xe4\xea\xe0" />'
+            b'<meta property="og:description" content="hi" />'
+            b'</head></html>'
+        )
 
         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)
+        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()
+        self.assertEqual(channel.code, 200)
+        self.assertEqual(channel.json_body["og:title"], u"\u0434\u043a\u0430")
+
+    def test_non_ascii_preview_content_type(self):
+        self.lookups["matrix.org"] = [(IPv4Address, "8.8.8.8")]
 
         end_content = (
             b'<html><head>'
-            b'<meta http-equiv="Content-Type" content="text/html; charset=windows-1251"/>'
             b'<meta property="og:title" content="\xe4\xea\xe0" />'
             b'<meta property="og:description" content="hi" />'
             b'</head></html>'
         )
 
-        self.fetches[0][0].callback(
+        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(
             (
-                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,
-                ),
+                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_non_ascii_preview_content_type(self):
+    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=matrix.org", shorthand=False
+            "GET", "url_preview?url=http://example.com", shorthand=False
         )
         request.render(self.preview_url)
         self.pump()
 
-        # We've made one fetch
-        self.assertEqual(len(self.fetches), 1)
+        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
+        )
 
-        end_content = (
-            b'<html><head>'
-            b'<meta property="og:title" content="\xe4\xea\xe0" />'
-            b'<meta property="og:description" content="hi" />'
-            b'</head></html>'
+        self.pump()
+        self.assertEqual(channel.code, 200)
+        self.assertEqual(
+            channel.json_body, {"og:title": "~matrix~", "og:description": "hi"}
         )
 
-        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,
-                ),
-            )
+    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"], u"\u0434\u043a\u0430")
+        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',
+            },
+        )

 

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