Monitoring of SSL certificate expiration time

[jpawlowski]

I wrote this script for me :-)

#!/bin/sh
DATE="/bin/date"
OPENSSL="/usr/local/openssl/current/bin/openssl"
HOST=$1
PORT=$2

if [ "$HOST" == "" ]; then
    exit
fi

if [ "$PORT" == "" ]; then
    PORT="443"
fi

CMD=`echo "" | $OPENSSL s_client -connect $HOST:$PORT 2>/dev/null | $OPENSSL x509 -enddate -noout 2>/dev/null|  sed 's/notAfter\=//'`

if [ "$CMD" != "" ]; then
    EXPIRE_DATE=`$DATE -d "$CMD" +%s`
    TIME=`$DATE +%s`
    EXPIRE_TIME=`expr $EXPIRE_DATE - $TIME`
    echo $EXPIRE_TIME
fi

It returns the time in seconds to the expiration.
(it does NOT check if the certificate is valid!)

[dorgan]

This is awsome!!!

[pattieja]

Returning string instead of integer or float

I implemented this script exactly as posted in ZABBIX 1.1beta8, and I cannot seem to get zabbix_agentd to return anything other than a string. Is there something special I need to do in order to make zabbix_agentd think the return value is an integer? I added a ".0" onto the end of the return value, but I'm still getting values like "[s|42510876.0]" when I check the value with 'zabbix_agentd -p'.