Enforce UUID of port/subnet ID for router interfaces

The add_router_interface/remove_router_interface actions
are not subject to the typical attribute map validation
so the input values for port_id and subnet_id were not
being checked for UUID likeness. This lead to an ugly
traceback if a boolean value was present which could
fill logs with garbage if a tenant kept doing it.

This patch calls the API validator for UUIDs in the
_validate_interface_info function where we validate requests
to add_router_inferface and remove_router_interface.

Conflicts:
	neutron/db/l3_db.py

Change-Id: I0a0d3279a21c815fb78528860fc2a35c1d5a4e2d
Closes-Bug: #1584510
(cherry picked from commit 18280216cb)

neutron/db/l3_db.py

@@ -518,6 +518,12 @@ class L3_NAT_dbonly_mixin(l3.RouterPluginBase):
         if not (port_id_specified or subnet_id_specified):
             msg = _("Either subnet_id or port_id must be specified")
             raise n_exc.BadRequest(resource='router', msg=msg)
+        for key in ('port_id', 'subnet_id'):
+            if key not in interface_info:
+                continue
+            err = attributes._validate_uuid(interface_info[key])
+            if err:
+                raise n_exc.BadRequest(resource='router', msg=err)
         if not for_removal:
             if port_id_specified and subnet_id_specified:
                 msg = _("Cannot specify both subnet-id and port-id")

neutron/tests/unit/extensions/test_l3.py

@@ -379,9 +379,9 @@ class L3NatTestCaseMixin(object):
                                  tenant_id=None,
                                  msg=None):
         interface_data = {}
-        if subnet_id:
+        if subnet_id is not None:
             interface_data.update({'subnet_id': subnet_id})
-        if port_id:
+        if port_id is not None:
             interface_data.update({'port_id': port_id})
 
         req = self.new_action_request('routers', interface_data, router_id,
@@ -960,6 +960,20 @@ class L3NatTestCaseBase(L3NatTestCaseMixin):
                 # nsx metadata access case
                 self.assertIn(payload['tenant_id'], [stid, ''], msg)
 
+    def test_router_add_interface_bad_values(self):
+        with self.router() as r:
+            exp_code = exc.HTTPBadRequest.code
+            self._router_interface_action('add',
+                                          r['router']['id'],
+                                          False,
+                                          None,
+                                          expected_code=exp_code)
+            self._router_interface_action('add',
+                                          r['router']['id'],
+                                          None,
+                                          False,
+                                          expected_code=exp_code)
+
     def test_router_add_interface_subnet(self):
         fake_notifier.reset()
         with self.router() as r: