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[1.2.X] Added protection against spoofing of X_FORWARDED_HOST headers…

…. A security announcement will be made shortly.

Backport of r16758 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@16764 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit c613af4d6485586c79d692b70a9acac429f3ca9d 1 parent 285b464
Russell Keith-Magee freakboy3742 authored
2  django/conf/global_settings.py
View
@@ -390,6 +390,8 @@
DEFAULT_TABLESPACE = ''
DEFAULT_INDEX_TABLESPACE = ''
+USE_X_FORWARDED_HOST = False
+
##############
# MIDDLEWARE #
##############
3  django/http/__init__.py
View
@@ -45,7 +45,8 @@ def __repr__(self):
def get_host(self):
"""Returns the HTTP host using the environment or request headers."""
# We try three options, in order of decreasing preference.
- if 'HTTP_X_FORWARDED_HOST' in self.META:
+ if settings.USE_X_FORWARDED_HOST and (
+ 'HTTP_X_FORWARDED_HOST' in self.META):
host = self.META['HTTP_X_FORWARDED_HOST']
elif 'HTTP_HOST' in self.META:
host = self.META['HTTP_HOST']
9 docs/ref/request-response.txt
View
@@ -185,10 +185,11 @@ Methods
.. method:: HttpRequest.get_host()
- Returns the originating host of the request using information from the
- ``HTTP_X_FORWARDED_HOST`` and ``HTTP_HOST`` headers (in that order). If
- they don't provide a value, the method uses a combination of
- ``SERVER_NAME`` and ``SERVER_PORT`` as detailed in `PEP 333`_.
+ Returns the originating host of the request using information from
+ the ``HTTP_X_FORWARDED_HOST`` (if enabled in the settings) and ``HTTP_HOST``
+ headers (in that order). If they don't provide a value, the method
+ uses a combination of ``SERVER_NAME`` and ``SERVER_PORT`` as
+ detailed in :pep:`3333`.
.. _PEP 333: http://www.python.org/dev/peps/pep-0333/
13 docs/ref/settings.txt
View
@@ -1698,6 +1698,19 @@ and ``NUMBER_GROUPING`` from current locale, to format the number.
See also ``THOUSAND_SEPARATOR`` and ``NUMBER_GROUPING``.
+.. setting:: USE_X_FORWARDED_HOST
+
+USE_X_FORWARDED_HOST
+--------------------
+
+.. versionadded:: 1.3.1
+
+Default: ``False``
+
+A boolean that specifies whether to use the X-Forwarded-Host header in
+preference to the Host header. This should only be enabled if a proxy
+which sets this header is in use.
+
.. setting:: YEAR_MONTH_FORMAT
YEAR_MONTH_FORMAT
90 tests/regressiontests/requests/tests.py
View
@@ -2,11 +2,13 @@
import time
import unittest
+from django.conf import settings
from django.http import HttpRequest, HttpResponse, parse_cookie
from django.core.handlers.wsgi import WSGIRequest
from django.core.handlers.modpython import ModPythonRequest
from django.utils.http import cookie_date
+
class RequestsTests(unittest.TestCase):
def test_httprequest(self):
@@ -57,3 +59,91 @@ def test_httprequest_location(self):
request.path = ''
self.assertEqual(request.build_absolute_uri(location="/path/with:colons"),
'http://www.example.com/path/with:colons')
+
+ def test_http_get_host(self):
+ old_USE_X_FORWARDED_HOST = settings.USE_X_FORWARDED_HOST
+ try:
+ settings.USE_X_FORWARDED_HOST = False
+
+ # Check if X_FORWARDED_HOST is provided.
+ request = HttpRequest()
+ request.META = {
+ u'HTTP_X_FORWARDED_HOST': u'forward.com',
+ u'HTTP_HOST': u'example.com',
+ u'SERVER_NAME': u'internal.com',
+ u'SERVER_PORT': 80,
+ }
+ # X_FORWARDED_HOST is ignored.
+ self.assertEqual(request.get_host(), 'example.com')
+
+ # Check if X_FORWARDED_HOST isn't provided.
+ request = HttpRequest()
+ request.META = {
+ u'HTTP_HOST': u'example.com',
+ u'SERVER_NAME': u'internal.com',
+ u'SERVER_PORT': 80,
+ }
+ self.assertEqual(request.get_host(), 'example.com')
+
+ # Check if HTTP_HOST isn't provided.
+ request = HttpRequest()
+ request.META = {
+ u'SERVER_NAME': u'internal.com',
+ u'SERVER_PORT': 80,
+ }
+ self.assertEqual(request.get_host(), 'internal.com')
+
+ # Check if HTTP_HOST isn't provided, and we're on a nonstandard port
+ request = HttpRequest()
+ request.META = {
+ u'SERVER_NAME': u'internal.com',
+ u'SERVER_PORT': 8042,
+ }
+ self.assertEqual(request.get_host(), 'internal.com:8042')
+
+ finally:
+ settings.USE_X_FORWARDED_HOST = old_USE_X_FORWARDED_HOST
+
+ def test_http_get_host_with_x_forwarded_host(self):
+ old_USE_X_FORWARDED_HOST = settings.USE_X_FORWARDED_HOST
+ try:
+ settings.USE_X_FORWARDED_HOST = True
+
+ # Check if X_FORWARDED_HOST is provided.
+ request = HttpRequest()
+ request.META = {
+ u'HTTP_X_FORWARDED_HOST': u'forward.com',
+ u'HTTP_HOST': u'example.com',
+ u'SERVER_NAME': u'internal.com',
+ u'SERVER_PORT': 80,
+ }
+ # X_FORWARDED_HOST is obeyed.
+ self.assertEqual(request.get_host(), 'forward.com')
+
+ # Check if X_FORWARDED_HOST isn't provided.
+ request = HttpRequest()
+ request.META = {
+ u'HTTP_HOST': u'example.com',
+ u'SERVER_NAME': u'internal.com',
+ u'SERVER_PORT': 80,
+ }
+ self.assertEqual(request.get_host(), 'example.com')
+
+ # Check if HTTP_HOST isn't provided.
+ request = HttpRequest()
+ request.META = {
+ u'SERVER_NAME': u'internal.com',
+ u'SERVER_PORT': 80,
+ }
+ self.assertEqual(request.get_host(), 'internal.com')
+
+ # Check if HTTP_HOST isn't provided, and we're on a nonstandard port
+ request = HttpRequest()
+ request.META = {
+ u'SERVER_NAME': u'internal.com',
+ u'SERVER_PORT': 8042,
+ }
+ self.assertEqual(request.get_host(), 'internal.com:8042')
+
+ finally:
+ settings.USE_X_FORWARDED_HOST = old_USE_X_FORWARDED_HOST
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