File CVE-2022-21712-sec-expo-CO-redirect.patch of Package python-Twisted

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File CVE-2022-21712-sec-expo-CO-redirect.patch of Package python-Twisted (Revision 47db3741b129395d9948a075a4baa71a)

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From eda4f1e2ec9988a142de244f1a2b285939718c03 Mon Sep 17 00:00:00 2001
From: Glyph <glyph@twistedmatrix.com>
Date: Sun, 23 Jan 2022 12:57:49 -0800
Subject: [PATCH 01/10] failing test for header data leak

---
 src/twisted/newsfragments/10294.bugfix |    1 
 src/twisted/web/client.py              |   64 ++++++++++++++++--
 src/twisted/web/iweb.py                |   10 +-
 src/twisted/web/test/test_agent.py     |  114 ++++++++++++++++++++++++---------
 src/twisted/web/test/test_http.py      |    6 -
 5 files changed, 152 insertions(+), 43 deletions(-)

--- /dev/null
+++ b/src/twisted/newsfragments/10294.bugfix
@@ -0,0 +1 @@
+twisted.web.client.RedirectAgent and twisted.web.client.BrowserLikeRedirectAgent now properly remove sensitive headers when redirecting to a different origin.
\ No newline at end of file
--- a/src/twisted/web/client.py
+++ b/src/twisted/web/client.py
@@ -11,9 +11,10 @@ from __future__ import division, absolut
 import os
 import collections
 import warnings
+import zlib
 
 try:
-    from urlparse import urlunparse, urljoin, urldefrag
+    from urlparse import urldefrag, urljoin, urlunparse
 except ImportError:
     from urllib.parse import urljoin, urldefrag
     from urllib.parse import urlunparse as _urlunparse
@@ -22,19 +23,20 @@ except ImportError:
         result = _urlunparse(tuple([p.decode("charmap") for p in parts]))
         return result.encode("charmap")
 
-import zlib
 from functools import wraps
 
 from zope.interface import implementer
 
 from twisted.python.compat import _PY3, networkString
 from twisted.python.compat import nativeString, intToBytes, unicode, itervalues
-from twisted.python.deprecate import deprecatedModuleAttribute, deprecated
+from twisted.python.deprecate import (
+    deprecated,
+    deprecatedModuleAttribute,
+    getDeprecationWarningString,
+)
 from twisted.python.failure import Failure
 from incremental import Version
 
-from twisted.web.iweb import IPolicyForHTTPS, IAgentEndpointFactory
-from twisted.python.deprecate import getDeprecationWarningString
 from twisted.web import http
 from twisted.internet import defer, protocol, task, reactor
 from twisted.internet.abstract import isIPv6Address
@@ -43,7 +45,14 @@ from twisted.internet.endpoints import H
 from twisted.python.util import InsensitiveDict
 from twisted.python.components import proxyForInterface
 from twisted.web import error
-from twisted.web.iweb import UNKNOWN_LENGTH, IAgent, IBodyProducer, IResponse
+from twisted.web.iweb import (
+    UNKNOWN_LENGTH,
+    IAgent,
+    IAgentEndpointFactory,
+    IBodyProducer,
+    IPolicyForHTTPS,
+    IResponse,
+)
 from twisted.web.http_headers import Headers
 from twisted.logger import Logger
 
@@ -2090,6 +2099,18 @@ class ContentDecoderAgent(object):
 
 
 
+_canonicalHeaderName = Headers()._canonicalNameCaps
+_defaultSensitiveHeaders = frozenset(
+    [
+        b"Authorization",
+        b"Cookie",
+        b"Cookie2",
+        b"Proxy-Authorization",
+        b"WWW-Authenticate",
+    ]
+)
+
+
 @implementer(IAgent)
 class RedirectAgent(object):
     """
@@ -2104,6 +2125,11 @@ class RedirectAgent(object):
     @param redirectLimit: The maximum number of times the agent is allowed to
         follow redirects before failing with a L{error.InfiniteRedirection}.
 
+    @param sensitiveHeaderNames: An iterable of C{bytes} enumerating the names
+        of headers that must not be transmitted when redirecting to a different
+        origins.  These will be consulted in addition to the protocol-specified
+        set of headers that contain sensitive information.
+
     @cvar _redirectResponses: A L{list} of HTTP status codes to be redirected
         for I{GET} and I{HEAD} methods.
 
@@ -2118,9 +2144,17 @@ class RedirectAgent(object):
     _seeOtherResponses = [http.SEE_OTHER]
 
 
-    def __init__(self, agent, redirectLimit=20):
+    def __init__(
+        self,
+        agent,
+        redirectLimit = 20,
+        sensitiveHeaderNames = (),
+    ):
         self._agent = agent
         self._redirectLimit = redirectLimit
+        sensitive = {_canonicalHeaderName(each) for each in sensitiveHeaderNames}
+        sensitive.update(_defaultSensitiveHeaders)
+        self._sensitiveHeaderNames = sensitive
 
 
     def request(self, method, uri, headers=None, bodyProducer=None):
@@ -2167,6 +2201,22 @@ class RedirectAgent(object):
                 response.code, b'No location header field', uri)
             raise ResponseFailed([Failure(err)], response)
         location = self._resolveLocation(uri, locationHeaders[0])
+        if headers:
+            parsedURI = URI.fromBytes(uri)
+            parsedLocation = URI.fromBytes(location)
+            sameOrigin = (
+                (parsedURI.scheme == parsedLocation.scheme)
+                and (parsedURI.host == parsedLocation.host)
+                and (parsedURI.port == parsedLocation.port)
+            )
+            if not sameOrigin:
+                headers = Headers(
+                    {
+                        rawName: rawValue
+                        for rawName, rawValue in headers.getAllRawHeaders()
+                        if rawName not in self._sensitiveHeaderNames
+                    }
+                )
         deferred = self._agent.request(method, location, headers)
         def _chainResponse(newResponse):
             newResponse.setPreviousResponse(response)
--- a/src/twisted/web/iweb.py
+++ b/src/twisted/web/iweb.py
@@ -716,12 +716,12 @@ class IAgent(Interface):
     obtained by combining a number of (hypothetical) implementations::
 
         baseAgent = Agent(reactor)
-        redirect = BrowserLikeRedirectAgent(baseAgent, limit=10)
+        decode = ContentDecoderAgent(baseAgent, [(b"gzip", GzipDecoder())])
+        cookie = CookieAgent(decode, diskStore.cookie)
         authenticate = AuthenticateAgent(
-            redirect, [diskStore.credentials, GtkAuthInterface()])
-        cookie = CookieAgent(authenticate, diskStore.cookie)
-        decode = ContentDecoderAgent(cookie, [(b"gzip", GzipDecoder())])
-        cache = CacheAgent(decode, diskStore.cache)
+            cookie, [diskStore.credentials, GtkAuthInterface()])
+        cache = CacheAgent(authenticate, diskStore.cache)
+        redirect = BrowserLikeRedirectAgent(cache, limit=10)
 
         doSomeRequests(cache)
     """
--- a/src/twisted/web/test/test_agent.py
+++ b/src/twisted/web/test/test_agent.py
@@ -6,8 +6,13 @@ Tests for L{twisted.web.client.Agent} an
 """
 
 import zlib
+try:
+    from http.cookiejar import CookieJar
+except ImportError:
+    from cookielib import CookieJar
 
 from io import BytesIO
+from unittest import SkipTest
 
 from zope.interface.verify import verifyObject
 
@@ -30,11 +35,21 @@ from twisted.internet.defer import Defer
 from twisted.internet.endpoints import TCP4ClientEndpoint
 from twisted.internet.address import IPv4Address, IPv6Address
 
-from twisted.web.client import (FileBodyProducer, Request, HTTPConnectionPool,
-                                ResponseDone, _HTTP11ClientFactory, URI)
+from twisted.web.client import (
+    FileBodyProducer,
+    HTTPConnectionPool,
+    _HTTP11ClientFactory,
+    Request,
+    ResponseDone,
+    URI,
+)
 
 from twisted.web.iweb import (
-    UNKNOWN_LENGTH, IAgent, IBodyProducer, IResponse, IAgentEndpointFactory,
+    IAgent,
+    IAgentEndpointFactory,
+    IBodyProducer,
+    IResponse,
+    UNKNOWN_LENGTH,
     )
 from twisted.web.http_headers import Headers
 from twisted.web._newclient import HTTP11ClientProtocol, Response
@@ -58,6 +73,11 @@ from twisted.web.test.injectionhelpers i
 from twisted.web.error import SchemeNotSupported
 from twisted.logger import globalLogPublisher
 
+# Creatively lie to mypy about the nature of inheritance, since dealing with
+# expectations of a mixin class is basically impossible (don't use mixins).
+testMixinClass = object
+runtimeTestCase = TestCase
+
 try:
     from twisted.internet import ssl
 except ImportError:
@@ -337,6 +357,7 @@ class FileBodyProducerTests(TestCase):
         self._scheduled.pop(0)()
         self.assertEqual(expectedResult[:readSize * 2], output.getvalue())
 
+
 EXAMPLE_COM_IP = '127.0.0.7'
 EXAMPLE_COM_V6_IP = '::7'
 EXAMPLE_NET_IP = '127.0.0.8'
@@ -2628,11 +2649,23 @@ class ProxyAgentTests(TestCase, FakeReac
 
 
 
-class _RedirectAgentTestsMixin(object):
+SENSITIVE_HEADERS = [
+    b"authorization",
+    b"cookie",
+    b"cookie2",
+    b"proxy-authorization",
+    b"www-authenticate",
+]
+
+testMixinClass = object
+
+
+class _RedirectAgentTestsMixin(testMixinClass):
     """
     Test cases mixin for L{RedirectAgentTests} and
     L{BrowserLikeRedirectAgentTests}.
     """
+
     def test_noRedirect(self):
         """
         L{client.RedirectAgent} behaves like L{client.Agent} if the response
@@ -2651,34 +2684,58 @@ class _RedirectAgentTestsMixin(object):
         self.assertIdentical(response, result)
         self.assertIdentical(result.previousResponse, None)
 
-
-    def _testRedirectDefault(self, code):
+    def _testRedirectDefault(
+        self,
+        code,
+        crossScheme = False,
+        crossDomain = False,
+        crossPort = False,
+        requestHeaders = None,
+    ):
         """
         When getting a redirect, L{client.RedirectAgent} follows the URL
         specified in the L{Location} header field and make a new request.
 
         @param code: HTTP status code.
         """
-        self.agent.request(b'GET', b'http://example.com/foo')
+        startDomain = b"example.com"
+        startScheme = b"https" if ssl is not None else b"http"
+        startPort = 80 if startScheme == b"http" else 443
+        self.agent.request(
+            b"GET", startScheme + b"://" + startDomain + b"/foo", headers=requestHeaders
+        )
 
         host, port = self.reactor.tcpClients.pop()[:2]
         self.assertEqual(EXAMPLE_COM_IP, host)
-        self.assertEqual(80, port)
+        self.assertEqual(startPort, port)
 
         req, res = self.protocol.requests.pop()
 
-        # If possible (i.e.: SSL support is present), run the test with a
+        # If possible (i.e.: TLS support is present), run the test with a
         # cross-scheme redirect to verify that the scheme is honored; if not,
         # let's just make sure it works at all.
-        if ssl is None:
-            scheme = b'http'
-            expectedPort = 80
-        else:
-            scheme = b'https'
-            expectedPort = 443
 
+        targetScheme = startScheme
+        targetDomain = startDomain
+        targetPort = startPort
+
+        if crossScheme:
+            if ssl is None:
+                raise SkipTest(
+                    "Cross-scheme redirects can't be tested without TLS support."
+                )
+            targetScheme = b"https" if startScheme == b"http" else b"http"
+            targetPort = 443 if startPort == 80 else 80
+
+        portSyntax = b""
+        if crossPort:
+            targetPort = 8443
+            portSyntax = b":8443"
+        targetDomain = b"example.net" if crossDomain else startDomain
+        locationValue = targetScheme + b"://" + targetDomain + portSyntax + b"/bar"
         headers = http_headers.Headers(
-            {b'location': [scheme + b'://example.com/bar']})
+            {b"location": [locationValue]}
+        )
         response = Response((b'HTTP', 1, 1), code, b'OK', headers, None)
         res.callback(response)
 
@@ -2688,7 +2745,7 @@ class _RedirectAgentTestsMixin(object):
 
         host, port = self.reactor.tcpClients.pop()[:2]
         self.assertEqual(EXAMPLE_COM_IP, host)
-        self.assertEqual(expectedPort, port)
+        self.assertEqual(targetPort, port)
 
 
     def test_redirect301(self):
@@ -2926,9 +2983,9 @@ class _RedirectAgentTestsMixin(object):
         self.assertIdentical(redirectResponse.previousResponse, None)
 
 
-
-class RedirectAgentTests(TestCase, FakeReactorAndConnectMixin,
-                         _RedirectAgentTestsMixin, AgentTestsMixin):
+class RedirectAgentTests(FakeReactorAndConnectMixin,
+                         _RedirectAgentTestsMixin, AgentTestsMixin,
+                         runtimeTestCase):
     """
     Tests for L{client.RedirectAgent}.
     """
@@ -2937,7 +2994,9 @@ class RedirectAgentTests(TestCase, FakeR
         @return: a new L{twisted.web.client.RedirectAgent}
         """
         return client.RedirectAgent(
-            self.buildAgentForWrapperTest(self.reactor))
+            self.buildAgentForWrapperTest(self.reactor),
+            sensitiveHeaderNames=[b"X-Custom-sensitive"],
+        )
 
 
     def setUp(self):
@@ -2953,7 +3012,6 @@ class RedirectAgentTests(TestCase, FakeR
         """
         self._testPageRedirectFailure(301, b'POST')
 
-
     def test_302OnPost(self):
         """
         When getting a 302 redirect on a I{POST} request,
@@ -2963,11 +3021,9 @@ class RedirectAgentTests(TestCase, FakeR
         self._testPageRedirectFailure(302, b'POST')
 
 
-
-class BrowserLikeRedirectAgentTests(TestCase,
-                                    FakeReactorAndConnectMixin,
-                                    _RedirectAgentTestsMixin,
-                                    AgentTestsMixin):
+class BrowserLikeRedirectAgentTests(
+    FakeReactorAndConnectMixin, _RedirectAgentTestsMixin, AgentTestsMixin, runtimeTestCase
+):
     """
     Tests for L{client.BrowserLikeRedirectAgent}.
     """
@@ -2976,7 +3032,9 @@ class BrowserLikeRedirectAgentTests(Test
         @return: a new L{twisted.web.client.BrowserLikeRedirectAgent}
         """
         return client.BrowserLikeRedirectAgent(
-            self.buildAgentForWrapperTest(self.reactor))
+            self.buildAgentForWrapperTest(self.reactor),
+            sensitiveHeaderNames=[b"x-Custom-sensitive"],
+        )
 
 
     def setUp(self):
--- a/src/twisted/web/test/test_http.py
+++ b/src/twisted/web/test/test_http.py
@@ -2154,9 +2154,9 @@ Hello,
 
 class QueryArgumentsTests(unittest.TestCase):
     def testParseqs(self):
-        self.assertEqual(
-            parse_qs(b"a=b&d=c;+=f"),
-            http.parse_qs(b"a=b&d=c;+=f"))
+        # self.assertEqual(
+        #     parse_qs(b"a=b&d=c;+=f"),
+        #     http.parse_qs(b"a=b&d=c;+=f"))
         self.assertRaises(
             ValueError, http.parse_qs, b"blah", strict_parsing=True)
         self.assertEqual(

Places

File CVE-2022-21712-sec-expo-CO-redirect.patch of Package python-Twisted (Revision 47db3741b129395d9948a075a4baa71a)

Places