Created
March 30, 2016 12:11
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#!/bin/sh | |
PRINT=true | |
LOGGER=false | |
warning_days=30 | |
certs_to_check='example.com:443 | |
mail.example.com:25 | |
wiki.example.org:443 | |
' | |
$PRINT && printf "%4s %26s %-38s %s\n" "Days" "Expires On" "Domain" "Options" | |
for CERT in $certs_to_check | |
do | |
add_opts='' | |
if [ "$(echo "$CERT" | cut -d: -f2)" -eq 25 ]; then | |
add_opts='-starttls smtp' | |
fi | |
domain="$(echo "$CERT" | cut -d: -f1)" | |
output=$(openssl s_client -showcerts -connect "${CERT}" \ | |
-servername "$domain" $add_opts < /dev/null 2>/dev/null |\ | |
openssl x509 -noout -dates 2>/dev/null) | |
if [ "$?" -ne 0 ]; then | |
$PRINT && echo "Error connecting to host for cert [$CERT]" | |
$LOGGER && logger -p local6.warn "Error connecting to host for cert [$CERT]" | |
continue | |
fi | |
start_date=$(echo "$output" | grep 'notBefore=' | cut -d= -f2) | |
end_date=$(echo "$output" | grep 'notAfter=' | cut -d= -f2) | |
start_epoch=$(date +%s -d "$start_date") | |
end_epoch=$(date +%s -d "$end_date") | |
epoch_now=$(date +%s) | |
if [ "$start_epoch" -gt "$epoch_now" ]; then | |
$PRINT && echo "Certificate for [$CERT] is not yet valid" | |
$LOGGER && logger -p local6.warn "Certificate for $CERT is not yet valid" | |
fi | |
days_to_expire=$(((end_epoch - epoch_now) / 86400)) | |
if [ "$days_to_expire" -lt "$warning_days" ]; then | |
$PRINT && echo -en "\033[91m" | |
$LOGGER && logger -p local6.warn "cert [$CERT] is soon to expire ($days_to_expire days)" | |
fi | |
$PRINT && printf "%4i %26s %-38s %s\033[0m\n" "$days_to_expire" "$end_date" "$CERT" "$add_opts" | |
done |
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Output looks like this: