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#!/usr/bin/env bash
#
function will_expire() {
expiry_status=""
expiry_vars="$(openssl "$openssl_cmd" -in "$object_path" -noout "${openssl_var_opts[@]}")"
expiry_date="$(echo "$expiry_vars" | grep "^$openssl_expiry_var=" | sed 's/^.\+=//g')"
if [ -z "$expiry_date" ]; then
return 1
fi
expiry_secs="$(date +%s -d "$expiry_date")"
diff="$((expiry_secs - now))"
if [ "$diff" -gt "$1" ]; then
return 1
elif [ "$diff" -lt 0 ]; then
remaining=0
else
remaining="$((diff / 86400))"
fi
total_matches="$((total_matches + 1))"
if [ -z "$min_expiry" ]; then
min_expiry="$remaining"
elif [ "$remaining" -lt "$min_expiry" ]; then
min_expiry="$remaining"
fi
}
function has_expired() {
if ! will_expire 0; then
return 1
fi
expiry_status="has expired"
}
function will_expire_days() {
if ! will_expire "$(($1 * 86400))"; then
return 1
fi
expiry_status="will expire in $remaining days"
}
function check_object() {
object_id="$(basename "$1")"
object_path="$1"
if has_expired || will_expire_days 3 || will_expire_days 7 || will_expire_days 15 || will_expire_days 30; then
{
echo
echo "$object_repr '$object_id' $expiry_status"
echo "$expiry_vars"
} >>"$mail_out"
fi
}
function check_dir() {
object_repr="$2"
for path in "$PKI_PUBLIC/$1"/*; do
check_object "$path"
done
}
if [ -z "$PKI_PUBLIC" ]; then
echo "$0: \$PKI_PUBLIC not set"
exit 1
elif [ ! -d "$PKI_PUBLIC" ]; then
echo "$0: invalid \$PKI_PUBLIC: $PKI_PUBLIC"
exit 1
fi
mail_out="$(mktemp)"
trap 'rm -f -- "$mail_out"' EXIT
now="$(date +%s)"
min_expiry=""
total_matches=0
openssl_cmd=x509
openssl_var_opts=(-startdate -enddate)
openssl_expiry_var="notAfter"
check_dir ca "CA"
check_dir cert "Certificate"
openssl_cmd=crl
openssl_var_opts=(-lastupdate -nextupdate)
openssl_expiry_var="nextUpdate"
check_dir crl "CRL for CA"
if [ -s "$mail_out" ] && ! cmp -s last-mail "$mail_out"; then
sendmail -t <<- EOF
From: PKI expiration reminder <pki-expiry>
To: sysadmin
Subject: $total_matches PKI objects will expire in $min_expiry days
The following PKI objects are due for renewal:
$(<"$mail_out")
EOF
mv -- "$mail_out" last-mail
fi
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