Check ssl certificates expiration dates from apache conf files

ssl_date_check.sh

#!/bin/bash

FILES=${1}

THRESHOLD_DATE=`date --date "+30 day" +%Y%m%d`

DOMAINS=`grep "ServerName\|ServerAlias" ${FILES} | cut -d":" -f2 | sed "s/\s*ServerName//g" | sed "s/\s*ServerAlias//g" | sort | uniq`
for DOMAIN in ${DOMAINS}
do
    FILE=`grep ${DOMAIN} ${FILES} | cut -d":" -f1 | sort | uniq`
    if [ "" == "$FILE" ]
    then
        continue
    fi  
    nslookup ${DOMAIN} &> /dev/null || continue
    echo -n "\"${DOMAIN}\";"
    DATE=`echo | openssl s_client -connect ${DOMAIN}:443 2>/dev/null | openssl x509 -noout -dates | grep notAfter | sed "s/notAfter=//g"`

    echo -n "\"${DATE}\";"
    FORMATTED_DATE=`date -d "${DATE}" +%Y%m%d`
    if [ "${THRESHOLD_DATE}" -gt "${FORMATTED_DATE}" ]
    then
        echo -n "\"WARNING\""
    else
        echo -n "\"OK\""
    fi  

    echo ""

done