diff --git a/include/proto/auth.h b/include/proto/auth.h
new file mode 100644
index 0000000..9808621
--- /dev/null
+++ b/include/proto/auth.h
@@ -0,0 +1,36 @@
+/*
+ * User authentication & authorization.
+ *
+ * Copyright 2010 Krzysztof Piotr Oledzki <ole@ans.pl>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#ifndef _PROTO_AUTH_H
+#define _PROTO_AUTH_H
+
+#include <common/config.h>
+#include <types/auth.h>
+
+extern struct userlist *userlist;
+
+struct userlist *auth_find_userlist(char *name);
+unsigned int auth_resolve_groups(struct userlist *l, char *groups);
+struct req_acl_rule *parse_auth_cond(const char **args, const char *file, int linenum, struct list *known_acl, int *acl_requires);
+void userlist_free(struct userlist *ul);
+void req_acl_free(struct list *r);
+int acl_match_auth(struct acl_test *test, struct acl_pattern *pattern);
+
+#endif /* _PROTO_AUTH_H */
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ * End:
+ */
+