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executable file 88 lines (64 sloc) 2.19 KB
#!/bin/sh
# -*- 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
# shellcheck disable=SC1090
. "$MUNIN_LIBDIR/plugins/plugin.sh"
ARGS=${0##*ssl_}
if echo "$ARGS" | grep -q "_"; then
SITE=$(echo "$ARGS" | cut -f 1 -d "_")
PORT=$(echo "$ARGS" | cut -f 2 -d "_")
else
SITE=$ARGS
PORT=443
fi
# Read data including a certificate from stdin and output the (fractional) number of days left
# until the expiry of this certificate. The output is empty if parsing failed.
parse_valid_days_from_certificate() {
local input_data
local valid_until_string
local valid_until_epoch
local now_epoch
local input_data
input_data=$(cat)
if echo "$input_data" | grep -q -- "-----BEGIN CERTIFICATE-----"; then
valid_until_string=$(echo "$input_data" | openssl x509 -noout -enddate \
| grep "^notAfter=" | cut -f 2 -d "=")
if [ -n "$valid_until_string" ]; then
valid_until_epoch=$(date --date="$valid_until_string" +%s)
if [ -n "$valid_until_epoch" ]; then
now_epoch=$(date +%s)
# calculate the number of days left
echo "$valid_until_epoch" "$now_epoch" | awk '{ print(($1 - $2) / (24 * 3600)); }'
fi
fi
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}:${PORT}" 2>/dev/null);
days_left=$(echo "$cert" | parse_valid_days_from_certificate)
[ -n "$days_left" ] || days_left="U"
printf "expire.value %s\n" "$days_left"