127a803d6SDoug Barton#!/bin/sh 227a803d6SDoug Barton# 327a803d6SDoug Barton# Copyright (c) 2001 The FreeBSD Project 427a803d6SDoug Barton# All rights reserved. 527a803d6SDoug Barton# 627a803d6SDoug Barton# Redistribution and use in source and binary forms, with or without 727a803d6SDoug Barton# modification, are permitted provided that the following conditions 827a803d6SDoug Barton# are met: 927a803d6SDoug Barton# 1. Redistributions of source code must retain the above copyright 1027a803d6SDoug Barton# notice, this list of conditions and the following disclaimer. 1127a803d6SDoug Barton# 2. Redistributions in binary form must reproduce the above copyright 1227a803d6SDoug Barton# notice, this list of conditions and the following disclaimer in the 1327a803d6SDoug Barton# documentation and/or other materials provided with the distribution. 1427a803d6SDoug Barton# 1527a803d6SDoug Barton# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1627a803d6SDoug Barton# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1727a803d6SDoug Barton# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1827a803d6SDoug Barton# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1927a803d6SDoug Barton# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2027a803d6SDoug Barton# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2127a803d6SDoug Barton# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2227a803d6SDoug Barton# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2327a803d6SDoug Barton# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2427a803d6SDoug Barton# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2527a803d6SDoug Barton# SUCH DAMAGE. 2627a803d6SDoug Barton# 2727a803d6SDoug Barton# $FreeBSD$ 2827a803d6SDoug Barton 2927a803d6SDoug Barton# This script is called by cron to store bits of randomness which are 3027a803d6SDoug Barton# then used to seed /dev/random on boot. 3127a803d6SDoug Barton 3210fe5181SDoug Barton# Originally developed by Doug Barton, DougB@FreeBSD.org 3310fe5181SDoug Barton 3427a803d6SDoug BartonPATH=/bin:/usr/bin 3527a803d6SDoug Barton 3627a803d6SDoug Barton# If there is a global system configuration file, suck it in. 3727a803d6SDoug Barton# 3827a803d6SDoug Bartonif [ -r /etc/defaults/rc.conf ]; then 3927a803d6SDoug Barton . /etc/defaults/rc.conf 4027a803d6SDoug Barton source_rc_confs 4127a803d6SDoug Bartonelif [ -r /etc/rc.conf ]; then 4227a803d6SDoug Barton . /etc/rc.conf 4327a803d6SDoug Bartonfi 4427a803d6SDoug Barton 4527a803d6SDoug Bartoncase ${entropy_dir} in 4627a803d6SDoug Barton[Nn][Oo]) 4727a803d6SDoug Barton exit 0 4827a803d6SDoug Barton ;; 4927a803d6SDoug Barton*) 5010fe5181SDoug Barton entropy_dir=${entropy_dir:-/var/db/entropy} 5127a803d6SDoug Barton ;; 5227a803d6SDoug Bartonesac 5327a803d6SDoug Barton 5427a803d6SDoug Bartonentropy_save_sz=${entropy_save_sz:-2048} 5527a803d6SDoug Bartonentropy_save_num=${entropy_save_num:-8} 5627a803d6SDoug Barton 5727a803d6SDoug Bartonif [ ! -d "${entropy_dir}" ]; then 5827a803d6SDoug Barton umask 077 5927a803d6SDoug Barton mkdir "${entropy_dir}" || { 6010fe5181SDoug Barton logger -is -t "$0" The entropy directory "${entropy_dir}" does not \ 6127a803d6SDoug Bartonexist, and cannot be created. Therefore no entropy can be saved. ; 6227a803d6SDoug Barton exit 1;} 6327a803d6SDoug Barton /usr/sbin/chown operator:operator "${entropy_dir}" 6427a803d6SDoug Barton chmod 0700 "${entropy_dir}" 6527a803d6SDoug Bartonfi 6627a803d6SDoug Barton 6727a803d6SDoug Bartonumask 377 6827a803d6SDoug Barton 6910fe5181SDoug Bartonfor file_num in `jot ${entropy_save_num} ${entropy_save_num} 1`; do 7010fe5181SDoug Barton if [ -e "${entropy_dir}/saved-entropy.${file_num}" ]; then 7127a803d6SDoug Barton if [ -f "${entropy_dir}/saved-entropy.${file_num}" ]; then 7227a803d6SDoug Barton new_num=$(($file_num + 1)) 7310fe5181SDoug Barton if [ "${new_num}" -gt "${entropy_save_num}" ]; then 7410fe5181SDoug Barton rm -f "${entropy_dir}/saved-entropy.${file_num}" 7510fe5181SDoug Barton else 7627a803d6SDoug Barton mv "${entropy_dir}/saved-entropy.${file_num}" \ 7727a803d6SDoug Barton "${entropy_dir}/saved-entropy.${new_num}" 7827a803d6SDoug Barton fi 7910fe5181SDoug Barton else 8010fe5181SDoug Barton logger -is -t "$0" \ 8110fe5181SDoug Barton"${entropy_dir}/saved-entropy.${file_num} is not a regular file, and therefore \ 8210fe5181SDoug Bartonit will not be rotated. Entropy file harvesting is aborted." 8310fe5181SDoug Barton exit 1 8410fe5181SDoug Barton fi 8510fe5181SDoug Barton fi 8627a803d6SDoug Bartondone 8727a803d6SDoug Barton 8827a803d6SDoug Bartondd if=/dev/random of="${entropy_dir}/saved-entropy.1" \ 8927a803d6SDoug Barton bs=2048 count=1 2> /dev/null 9027a803d6SDoug Barton 9127a803d6SDoug Bartonexit 0 9227a803d6SDoug Barton 93