check-ssl-expiry.sh

#!/bin/bash

# Check SSL expiry dates
#
# This script can be used to check SSL certificate expiry dates for
# given list of domains.
#
#
# Usage
# ./check-ssl-expiry.sh
#
# Required commands (must be in path):
# openssl, grep, sed, sort


# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.


DOMAINS=(
    www.google.com
    www.microsoft.com
)

for domain in ${DOMAINS[*]}
do
    expiryRaw=`echo | openssl s_client -servername $domain -connect $domain:443 2>/dev/null | openssl x509 -noout -dates | grep notAfter | sed 's/notAfter=//'`
    expiry=`date -d "$expiryRaw" +%Y-%m-%d`
    out+="$expiry $domain\n"
done

echo -e $out | sort