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#!/bin/bash
readonly NAGIOS_OK=0
readonly NAGIOS_WARNING=1
readonly NAGIOS_CRITICAL=2
readonly NAGIOS_UNKNOWN=3
function main {
local file_name="$1"
local warn_days="$2"
local crit_days="$3"
end_date=$(openssl x509 -in "$file_name" -noout -enddate | awk -F '=' '{ print($2) }')
if [ $? -ne 0 ]; then
echo "UNKNOWN - failed to read notAfter from certificate $file_name"
return "$NAGIOS_UNKNOWN"
fi
end=$(date -d "$end_date" +%s)
now=$(date +%s)
delta_days=$(( (end - now) / (24 * 3600) ))
local code="$NAGIOS_OK"
local state="OK"
local tag=""
if [ $delta_days -le $crit_days ]; then
code="$NAGIOS_CRITICAL"
state="CRIT"
tag="(!!)"
elif [ $delta_days -le $warn_days ]; then
code="$NAGIOS_WARNING"
state="WARN"
tag="(!)"
fi
echo "$state - certificate will expire in $delta_days$tag days."
exit "$code"
}
if [ -z "$1" ] || [ -z "$2" ] || [ -z "$3" ]; then
echo "UNKNOWN - please specify certifacte file name, warn and critical days"
exit "$NAGIOS_UNKNOWN"
fi
main "$1" "$2" "$3"
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