rlm_sql_log unauthorized host clients

Hi its me again, an other question is, who to log unauthorized clients from nas devices? In the man page only accounting and post-auth is listet for rlm_sql_log. When i do the sql_log in the post_auth only the successful clients where logged. I want to log nas clients authorized and non authorized hosts. Is it possible to do that with sql_log or did i have to use sql? I think sql is the wrong one because i don't want to use mysql as backend for accounts. May i have to write my own module or modify the rlm_sql_log? Thanks in advanced, Jan