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Bash SSL Certificate Expiration Check
#!/bin/bash
TARGET="mysite.example.net";
RECIPIENT="hostmaster@mysite.example.net";
DAYS=7;
echo "checking if $TARGET expires in less than $DAYS days";
expirationdate=$(date -d "$(: | openssl s_client -connect $TARGET:443 -servername $TARGET 2>/dev/null \
| openssl x509 -text \
| grep 'Not After' \
|awk '{print $4,$5,$7}')" '+%s');
in7days=$(($(date +%s) + (86400*$DAYS)));
if [ $in7days -gt $expirationdate ]; then
echo "KO - Certificate for $TARGET expires in less than $DAYS days, on $(date -d @$expirationdate '+%Y-%m-%d')" \
| mail -s "Certificate expiration warning for $TARGET" $RECIPIENT ;
else
echo "OK - Certificate expires on $expirationdate";
fi;
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