RBAC tightening for share access rule

Non privileged users of unrelated projects
must not be able to retrieve details of an
access rule. We can add a further check to
/share-access-rules APIs to validate that
the caller has access to the share that these
rules pertain to.

Change-Id: I0009a3d682ee5d9a946821c3f82dfd90faa886aa
Closes-Bug: #1917417
Signed-off-by: Goutham Pacha Ravi <gouthampravi@gmail.com>

manila/share/api.py

@@ -1987,6 +1987,10 @@ class API(base.Base):
         """Returns access rule with the id."""
         policy.check_policy(context, 'share', 'access_get')
         rule = self.db.share_access_get(context, access_id)
+        # NOTE(gouthamr): Check if the caller has access to the share that
+        # the rule belongs to:
+        self.get(context, rule['share_id'])
+
         return rule
 
     @policy.wrap_check_policy('share')

manila/tests/api/v2/test_share_accesses.py

@@ -113,6 +113,37 @@ class ShareAccessesAPITest(test.TestCase):
                                       version="2.45")
         self.assertRaises(exc.HTTPBadRequest, self.controller.index, req)
 
+    def test_show_access_not_authorized(self):
+        share = db_utils.create_share(
+            project_id='c3c5ec1ccc4640d0af1914cbf11f05ad',
+            is_public=False)
+        access = db_utils.create_access(
+            id='76699c6b-f3da-47d7-b468-364f1347ba04',
+            share_id=share['id'])
+        req = fakes.HTTPRequest.blank(
+            '/v2/share-access-rules/%s' % access['id'],
+            version="2.45")
+        self.mock_object(
+            policy, 'check_policy',
+            mock.Mock(side_effect=[None, None, exception.NotAuthorized]))
+
+        self.assertRaises(exception.NotAuthorized,
+                          self.controller.show,
+                          req,
+                          access['id'])
+        policy.check_policy.assert_has_calls([
+            mock.call(req.environ['manila.context'],
+                      'share_access_rule', 'get'),
+            mock.call(req.environ['manila.context'],
+                      'share', 'access_get'),
+            mock.call(req.environ['manila.context'],
+                      'share', 'get', mock.ANY)])
+        policy_check_call_args_list = policy.check_policy.call_args_list[2][0]
+        share_being_checked = policy_check_call_args_list[3]
+        self.assertEqual('c3c5ec1ccc4640d0af1914cbf11f05ad',
+                         share_being_checked['project_id'])
+        self.assertIs(False, share_being_checked['is_public'])
+
     def test_show_access_not_found(self):
         self.assertRaises(
             exc.HTTPNotFound,

manila/tests/share/test_api.py

@@ -2695,11 +2695,13 @@ class ShareAPITestCase(test.TestCase):
 
     def test_access_get(self):
         with mock.patch.object(db_api, 'share_access_get',
-                               mock.Mock(return_value='fake')):
+                               mock.Mock(return_value={'share_id': 'fake'})):
+            self.mock_object(self.api, 'get')
             rule = self.api.access_get(self.context, 'fakeid')
-            self.assertEqual('fake', rule)
+            self.assertEqual({'share_id': 'fake'}, rule)
             db_api.share_access_get.assert_called_once_with(
                 self.context, 'fakeid')
+            self.api.get.assert_called_once_with(self.context, 'fake')
 
     def test_access_get_all(self):
         share = db_utils.create_share(id='fakeid')

releasenotes/notes/bug-1917417-fix-rbac-check-on-share-access-rules-efdddaf9e6f68fdf.yaml

@@ -0,0 +1,7 @@
+---
+security:
+  - |
+    An RBAC policy check has been enforced against the GET /share-access-rules
+    API to ensure that users are permitted to access the share that the
+    access rule belongs to. See `bug 1917417
+    <https://launchpad.net/bugs/1917417>`_ for more details.