local ssl = require"ssl"; local datetime_parse = require"util.datetime".parse; local load_cert = ssl.loadcertificate; local st = require"util.stanza" -- These are in days. local nag_time = module:get_option_number("checkcerts_notify", 7) * 86400; if not load_cert then module:log("error", "This version of LuaSec (%s) does not support certificate checking", ssl._VERSION); return end local pat = "^([JFMAONSD][ceupao][glptbvyncr]) ?(%d%d?) (%d%d):(%d%d):(%d%d) (%d%d%d%d) GMT$"; local months = {Jan=1,Feb=2,Mar=3,Apr=4,May=5,Jun=6,Jul=7,Aug=8,Sep=9,Oct=10,Nov=11,Dec=12}; local function parse_x509_datetime(s) local month, day, hour, min, sec, year = s:match(pat); month = months[month]; return datetime_parse(("%04d-%02d-%02dT%02d:%02d:%02dZ"):format(year, month, day, hour, min, sec)); end local timeunits = {"minute",60,"hour",3600,"day",86400,"week",604800,"month",2629746,"year",31556952,}; local function humantime(timediff) local ret = {}; for i=#timeunits,2,-2 do if timeunits[i] < timediff then local n = math.floor(timediff / timeunits[i]); if n > 0 and #ret < 2 then ret[#ret+1] = ("%d %s%s"):format(n, timeunits[i-1], n ~= 1 and "s" or ""); timediff = timediff - n*timeunits[i]; end end end return table.concat(ret, " and ") end local function check_certs_validity() local now = os.time(); -- First, let's find out what certificate this host uses. local ssl_config = config.rawget(module.host, "ssl"); if not ssl_config or not ssl_config.certificate then ssl_config = config.get(module.host:match("%.(.*)"), "ssl"); end if not ssl_config or not ssl_config.certificate then ssl_config = config.get("*", "ssl"); end if not ssl_config or not ssl_config.certificate then log("warn", "Could not find a certificate to check"); return; end local certfile = ssl_config.certificate; local fh = io.open(certfile); -- Load the file. cert = fh and fh:read"*a"; fh = fh and fh:close(); local cert = cert and load_cert(cert); -- And parse if not cert then module:log("warn", "No certificate configured for this host, please fix this and reload this module to check expiry"); return end local expires_at = parse_x509_datetime(cert:notafter()); local expires_in = os.difftime(expires_at, now); local fmt = "Certificate %s expires in %s" local nag_admin = expires_in < nag_time; local log_warn = expires_in < nag_time * 2; local timediff = expires_in; if expires_in < 0 then fmt = "Certificate %s expired %s ago"; timediff = -timediff; end timediff = humantime(timediff); module:log(log_warn and "warn" or "info", fmt, certfile, timediff); if nag_admin then local body = fmt:format("for host ".. module.host, timediff); for _,admin in ipairs(module:get_option_array("admins", {})) do module:send(st.message({ from = module.host, to = admin, type = "chat" }, body)); end end return math.max(86400, expires_in / 3); end module:add_timer(1, check_certs_validity);