#!/bin/bash
#
# Issue warning e-mails if SSL certificates expire, using
# certwatch(1).  Set NOCERTWATCH=yes in /etc/sysconfig/httpd
# to disable.  Pass additional options to certwatch in the
# CERTWATCH_OPTS variable; see the man page for details.
# 

[ -r /etc/sysconfig/httpd ] && . /etc/sysconfig/httpd

# Use configured httpd binary
httpd=${HTTPD-/usr/sbin/httpd}

# Sanity checks
test -z "${NOCERTWATCH}" || exit 0
test -x ${httpd} || exit 0
test -x /usr/bin/certwatch || exit 0
test -r /etc/httpd/conf/httpd.conf || exit 0
test -x /usr/sbin/sendmail || exit 0
test -x /etc/httpd/modules/mod_ssl.so || exit 0
test -x /bin/sort || exit 0

set -o pipefail # pick up exit code of httpd not sort

certs=`${httpd} ${OPTIONS} -t -DDUMP_CERTS 2>/dev/null | /bin/sort -u`
RETVAL=$?
test $RETVAL -eq 0 || exit 0

for c in $certs; do
  # Check whether a warning message is needed, then issue one if so.
  /usr/bin/certwatch $CERTWATCH_OPTS -q "$c" && 
    /usr/bin/certwatch $CERTWATCH_OPTS "$c" | /usr/sbin/sendmail -oem -oi -t 2>/dev/null
done