[1.4.x] Fixed a security issue in http redirects. Disclosure and new release forthcoming.

Backport of 4129201c3e0fa057c198bdefcb34686a23b4a93c from master.

1 files changed, 12 insertions, 10 deletions

diff --git a/django/http/__init__.py b/django/http/__init__.py
index 94478ae5ae..8af7228b4b 100644
--- a/django/http/__init__.py
+++ b/django/http/__init__.py
@@ -9,7 +9,7 @@ import warnings
 
 from pprint import pformat
 from urllib import urlencode, quote
-from urlparse import urljoin
+from urlparse import urljoin, urlparse
 try:
     from cStringIO import StringIO
 except ImportError:
@@ -114,7 +114,7 @@ class CompatCookie(SimpleCookie):
 
 from django.conf import settings
 from django.core import signing
-from django.core.exceptions import ImproperlyConfigured
+from django.core.exceptions import ImproperlyConfigured, SuspiciousOperation
 from django.core.files import uploadhandler
 from django.http.multipartparser import MultiPartParser
 from django.http.utils import *
@@ -731,19 +731,21 @@ class HttpResponse(object):
             raise Exception("This %s instance cannot tell its position" % self.__class__)
         return sum([len(str(chunk)) for chunk in self._container])
 
-class HttpResponseRedirect(HttpResponse):
-    status_code = 302
+class HttpResponseRedirectBase(HttpResponse):
+    allowed_schemes = ['http', 'https', 'ftp']
 
     def __init__(self, redirect_to):
-        super(HttpResponseRedirect, self).__init__()
+        super(HttpResponseRedirectBase, self).__init__()
+        parsed = urlparse(redirect_to)
+        if parsed.scheme and parsed.scheme not in self.allowed_schemes:
+            raise SuspiciousOperation("Unsafe redirect to URL with scheme '%s'" % parsed.scheme)
         self['Location'] = iri_to_uri(redirect_to)
 
-class HttpResponsePermanentRedirect(HttpResponse):
-    status_code = 301
+class HttpResponseRedirect(HttpResponseRedirectBase):
+    status_code = 302
 
-    def __init__(self, redirect_to):
-        super(HttpResponsePermanentRedirect, self).__init__()
-        self['Location'] = iri_to_uri(redirect_to)
+class HttpResponsePermanentRedirect(HttpResponseRedirectBase):
+    status_code = 301
 
 class HttpResponseNotModified(HttpResponse):
     status_code = 304