Fix a security issue in the admin. Disclosure and new release forthcoming.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15033 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/options.py

@@ -10,7 +10,9 @@ from django.contrib import messages
 from django.views.decorators.csrf import csrf_protect
 from django.core.exceptions import PermissionDenied, ValidationError
 from django.db import models, transaction
-from django.db.models.fields import BLANK_CHOICE_DASH
+from django.db.models.related import RelatedObject
+from django.db.models.fields import BLANK_CHOICE_DASH, FieldDoesNotExist
+from django.db.models.sql.constants import LOOKUP_SEP, QUERY_TERMS
 from django.http import Http404, HttpResponse, HttpResponseRedirect
 from django.shortcuts import get_object_or_404, render_to_response
 from django.utils.decorators import method_decorator
@@ -183,6 +185,30 @@ class BaseModelAdmin(object):
     def get_readonly_fields(self, request, obj=None):
         return self.readonly_fields
 
+    def lookup_allowed(self, lookup):
+        parts = lookup.split(LOOKUP_SEP)
+
+        # Last term in lookup is a query term (__exact, __startswith etc)
+        # This term can be ignored.
+        if len(parts) > 1 and parts[-1] in QUERY_TERMS:
+            parts.pop()
+
+        # Special case -- foo__id__exact and foo__id queries are implied
+        # if foo has been specificially included in the lookup list; so
+        # drop __id if it is the last part.
+        if len(parts) > 1 and parts[-1] == self.model._meta.pk.name:
+            parts.pop()
+
+        try:
+            self.model._meta.get_field_by_name(parts[0])
+        except FieldDoesNotExist:
+            # Lookups on non-existants fields are ok, since they're ignored
+            # later.
+            return True
+        else:
+            clean_lookup = LOOKUP_SEP.join(parts)
+            return clean_lookup in self.list_filter or clean_lookup == self.date_hierarchy
+
 class ModelAdmin(BaseModelAdmin):
     "Encapsulates all admin options and functionality for a given model."
 

django/contrib/admin/views/main.py

@@ -1,6 +1,7 @@
 from django.contrib.admin.filterspecs import FilterSpec
 from django.contrib.admin.options import IncorrectLookupParameters
 from django.contrib.admin.util import quote
+from django.core.exceptions import SuspiciousOperation
 from django.core.paginator import Paginator, InvalidPage
 from django.db import models
 from django.db.models.query import QuerySet
@@ -187,13 +188,18 @@ class ChangeList(object):
                 else:
                     lookup_params[key] = True
 
+            if not self.model_admin.lookup_allowed(key):
+                raise SuspiciousOperation(
+                    "Filtering by %s not allowed" % key
+                )
+
         # Apply lookup parameters from the query string.
         try:
             qs = qs.filter(**lookup_params)
         # Naked except! Because we don't have any other way of validating "params".
         # They might be invalid if the keyword arguments are incorrect, or if the
         # values are not in the correct type, so we might get FieldError, ValueError,
-        # ValicationError, or ? from a custom field that raises yet something else 
+        # ValicationError, or ? from a custom field that raises yet something else
         # when handed impossible data.
         except:
             raise IncorrectLookupParameters

tests/regressiontests/admin_views/models.py

@@ -92,7 +92,7 @@ class ChapterInline(admin.TabularInline):
 
 class ArticleAdmin(admin.ModelAdmin):
     list_display = ('content', 'date', callable_year, 'model_year', 'modeladmin_year')
-    list_filter = ('date',)
+    list_filter = ('date', 'section')
 
     def changelist_view(self, request):
         "Test that extra_context works"
@@ -584,6 +584,9 @@ class Album(models.Model):
     owner = models.ForeignKey(User)
     title = models.CharField(max_length=30)
 
+class AlbumAdmin(admin.ModelAdmin):
+    list_filter = ['title']
+
 admin.site.register(Article, ArticleAdmin)
 admin.site.register(CustomArticle, CustomArticleAdmin)
 admin.site.register(Section, save_as=True, inlines=[ArticleInline])
@@ -630,4 +633,4 @@ admin.site.register(Promo)
 admin.site.register(ChapterXtra1)
 admin.site.register(Pizza, PizzaAdmin)
 admin.site.register(Topping)
-admin.site.register(Album)
+admin.site.register(Album, AlbumAdmin)

tests/regressiontests/admin_views/tests.py

@@ -4,6 +4,7 @@ import re
 import datetime
 
 from django.conf import settings
+from django.core.exceptions import SuspiciousOperation
 from django.core.files import temp as tempfile
 # Register auth models with the admin.
 from django.contrib.auth import REDIRECT_FIELD_NAME, admin
@@ -300,6 +301,10 @@ class AdminViewBasicTest(TestCase):
         self.assertContains(response, 'Choisir une heure')
         deactivate()
 
+    def test_disallowed_filtering(self):
+        self.assertRaises(SuspiciousOperation,
+            self.client.get, "/test_admin/admin/admin_views/album/?owner__email__startswith=fuzzy"
+        )
 
 class SaveAsTests(TestCase):
     fixtures = ['admin-views-users.xml','admin-views-person.xml']