diff --git a/auth.h b/auth.h
index 3771e82..72126e0 100644
--- a/auth.h
+++ b/auth.h
@@ -7,4 +7,11 @@
 struct passwd *
 auth_get_user(void);
 
+int allowed_user(struct passwd * pw);;
+
+#define AUTH_FAIL_MAX 6
+#define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2)
+#define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
+
 #endif
+