Munin contributed plugins

#!/bin/bash

# -*- sh -*-

: << =cut

=head1 NAME

ssl_ - Plugin to monitor certificate expiration

=head1 CONFIGURATION

This plugin does not normally require configuration.

To set warning and critical levels do like this:

  [ssl_*]

      env.warning 30:

=head1 AUTHOR

Pactrick Domack

Copyright (C) 2013 Patrick Domack <patrickdk@patrickdk.com>

=head1 LICENSE

=cut

. $MUNIN_LIBDIR/plugins/plugin.sh

ARGS=${0##*ssl_}

SITE=${ARGS/_*/}

PORT=${ARGS##*_}

if [ "$PORT" = "$SITE" ]; then

	PORT=443

fi

case $1 in

    config)

        echo "graph_title $SITE SSL Certificate Expire"

        echo 'graph_args --base 1000'

        echo 'graph_vlabel days left'

        echo 'graph_category security'

        echo "graph_info This graph shows the days left for the certificate being served by $SITE"

        echo 'expire.label days'

        print_warning expire

        print_critical expire

        exit 0

        ;;

esac

cert=$(echo "" | openssl s_client -CApath /etc/ssl/certs -servername "${SITE}" -connect "${SITE}:${PORT}" 2>/dev/null);

if [[ "${cert}" = *"-----BEGIN CERTIFICATE-----"* ]]; then

  echo "${cert}" | openssl x509 -noout -enddate | awk -F= 'BEGIN { split("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec", month, " "); for (i=1; i<=12; i++) mdigit[month[i]] = i; } /notAfter/ { split($0,a,"="); split(a[2],b," "); split(b[3],time,":"); datetime=b[4] " " mdigit[b[1]] " " b[2] " " time[1] " " time[2] " " time[3]; days=(mktime(datetime)-systime())/86400; print "expire.value " days; }'

fi