#!/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.
# 

# For certificates in pem files
watch_files_certs() 
{
	test -x /etc/httpd/modules/mod_ssl.so || return 0
	test -r /etc/httpd/conf/httpd.conf    || return 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 || return

    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
}

# For certificates in the database
watch_database_certs() 
{
    test -x /usr/bin/certutil || return 0
    test -x /etc/httpd/modules/libmodnss.so || return 0
    test -r /etc/httpd/conf.d/nss.conf || return 0
        
    # find path to mod_nss' database
    database=`/usr/bin/gawk '/^NSSCertificateDatabase/ { print $2 }' /etc/httpd/conf.d/nss.conf`
    
    # find the database prefix if any from the mod_nss config file
    dbprefix=`/usr/bin/gawk '/^NSSDBPrefix/ { print $2 }' /etc/httpd/conf.d/nss.conf`

    set -o pipefail # pick up exit code of certutil not gawk
    nicknames=`certutil -L -d $database | /usr/bin/gawk '{ print $1 }'`
    RETVAL=$?
    test $RETVAL -eq 0 || return 0
    
    for n in $nicknames; do
        # Check whether a warning message is needed, then issue one if so.
        /usr/bin/certwatch $CERTWATCH_OPTS -q -d "$database" -c "$dbprefix" -k "$dbprefix" "$n" && 
          /usr/bin/certwatch $CERTWATCH_OPTS -d "$database" -c "$dbprefix" -k "$dbprefix" "$n" | /usr/sbin/sendmail -oem -oi -t 2>/dev/null
    done
}

[ -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 -x /usr/sbin/sendmail || exit 0
test -x /bin/sort || exit 0

watch_files_certs
watch_database_certs