fix(region): check user credential length when exec task (#20791)

pkg/cloudcommon/db/taskman/tasks.go

@@ -82,12 +82,18 @@ type STaskManager struct {
 }
 
 var TaskManager *STaskManager
+var userCredWidthLimit = 0
 
 func init() {
 	TaskManager = &STaskManager{
 		SModelBaseManager: db.NewModelBaseManager(STask{}, "tasks_tbl", "task", "tasks"),
 	}
 	TaskManager.SetVirtualObject(TaskManager)
+	if field, ok := reflect.TypeOf(&STask{}).Elem().FieldByName("UserCred"); ok {
+		if widthStr := field.Tag.Get(sqlchemy.TAG_WIDTH); len(widthStr) > 0 {
+			userCredWidthLimit, _ = strconv.Atoi(widthStr)
+		}
+	}
 }
 
 type STask struct {
@@ -321,6 +327,10 @@ func (manager *STaskManager) NewTask(
 		ParentTaskId: parentTaskId,
 	}
 
+	if userCredWidthLimit > 0 && len(userCred.String()) > userCredWidthLimit {
+		return nil, fmt.Errorf("Too many permissions for user %s", userCred.GetUserName())
+	}
+
 	ownerId := obj.GetOwnerId()
 	if ownerId != nil {
 		task.DomainId = ownerId.GetProjectDomainId()