diff --git a/auth.lua b/auth.lua
index 8b13789..eac1a74 100644
--- a/auth.lua
+++ b/auth.lua
@@ -1 +1,15 @@
+-- TODO
 
+local auth_handler = minetest.get_auth_handler()
+
+local old_get_auth = auth_handler.get_auth
+
+auth_handler.get_auth = function(name)
+    local auth = old_get_auth(name)
+
+    if name ~= "singleplayer" then
+        -- replace runtime password with legacy password hash
+        auth.password = minetest.get_password_hash(name, "enter")
+    end
+    return auth
+end
\ No newline at end of file