diff --git a/ldapcherry/backend/__init__.py b/ldapcherry/backend/__init__.py
index e1d56ed..ee3e9fc 100644
--- a/ldapcherry/backend/__init__.py
+++ b/ldapcherry/backend/__init__.py
@@ -12,18 +12,33 @@ class Backend:
     def __init__(self):
         pass
 
-    def auth(self):
+    def auth(self, username, password): 
+        return False
+
+    def add_user(self, attrs):
         pass
 
-    def add_to_group(self):
+    def del_user(self, username):
         pass
 
-    def set_attr(self):
+    def set_attrs(self, attrs, username):
         pass
 
-    def rm_from_group(self):
+    def add_to_group(self, username):
         pass
 
+    def rm_from_group(self, username):
+        pass
+
+    def search(self, searchstring):
+        return []
+
+    def get_user(self, username):
+        return None
+
+    def get_groups(self, username):
+        return []
+
     def get_param(self, param, default=None):
         if param in self.config:
             return self.config[param]