170922Sdougb#!/bin/sh 270922Sdougb# 3241205Sdougb# Copyright (c) 2001-2006,2012 Douglas Barton, dougb@FreeBSD.org 470922Sdougb# All rights reserved. 570922Sdougb# 670922Sdougb# Redistribution and use in source and binary forms, with or without 770922Sdougb# modification, are permitted provided that the following conditions 870922Sdougb# are met: 970922Sdougb# 1. Redistributions of source code must retain the above copyright 1070922Sdougb# notice, this list of conditions and the following disclaimer. 1170922Sdougb# 2. Redistributions in binary form must reproduce the above copyright 1270922Sdougb# notice, this list of conditions and the following disclaimer in the 1370922Sdougb# documentation and/or other materials provided with the distribution. 1470922Sdougb# 1570922Sdougb# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1670922Sdougb# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1770922Sdougb# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1870922Sdougb# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1970922Sdougb# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2070922Sdougb# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2170922Sdougb# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2270922Sdougb# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2370922Sdougb# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2470922Sdougb# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2570922Sdougb# SUCH DAMAGE. 2670922Sdougb# 2770922Sdougb# $FreeBSD$ 2870922Sdougb 2970922Sdougb# This script is called by cron to store bits of randomness which are 3070922Sdougb# then used to seed /dev/random on boot. 3170922Sdougb 32241205Sdougb# Originally developed by Doug Barton, dougb@FreeBSD.org 3371014Sdougb 3470922SdougbPATH=/bin:/usr/bin 3570922Sdougb 3670922Sdougb# If there is a global system configuration file, suck it in. 3770922Sdougb# 3870922Sdougbif [ -r /etc/defaults/rc.conf ]; then 3970922Sdougb . /etc/defaults/rc.conf 40161683Sdougb source_rc_confs 2>/dev/null 4170922Sdougbelif [ -r /etc/rc.conf ]; then 42161683Sdougb . /etc/rc.conf 2>/dev/null 4370922Sdougbfi 4470922Sdougb 4570922Sdougbcase ${entropy_dir} in 4670922Sdougb[Nn][Oo]) 4770922Sdougb exit 0 4870922Sdougb ;; 4970922Sdougb*) 5071014Sdougb entropy_dir=${entropy_dir:-/var/db/entropy} 5170922Sdougb ;; 5270922Sdougbesac 5370922Sdougb 5470922Sdougbentropy_save_sz=${entropy_save_sz:-2048} 5570922Sdougbentropy_save_num=${entropy_save_num:-8} 5670922Sdougb 5770922Sdougbif [ ! -d "${entropy_dir}" ]; then 58241205Sdougb install -d -o operator -g operator -m 0700 "${entropy_dir}" || { 59241205Sdougb logger -is -t "$0" The entropy directory "${entropy_dir}" does \ 60241205Sdougb not exist, and cannot be created. Therefore no entropy can \ 61241205Sdougb be saved.; exit 1; } 6270922Sdougbfi 6370922Sdougb 64241205Sdougbcd "${entropy_dir}" || { 65241205Sdougb logger -is -t "$0" Cannot cd to the entropy directory: "${entropy_dir}". \ 66241205Sdougb Entropy file rotation is aborted.; exit 1; } 67241205Sdougb 68241205Sdougbfor f in saved-entropy.*; do 69241205Sdougb case "${f}" in saved-entropy.\*) continue ;; esac # No files match 70241205Sdougb [ ${f#saved-entropy\.} -ge ${entropy_save_num} ] && unlink ${f} 71241205Sdougbdone 72241205Sdougb 7370922Sdougbumask 377 7470922Sdougb 75241205Sdougbn=$(( ${entropy_save_num} - 1 )) 76241205Sdougbwhile [ ${n} -ge 1 ]; do 77241205Sdougb if [ -f "saved-entropy.${n}" ]; then 78241205Sdougb mv "saved-entropy.${n}" "saved-entropy.$(( ${n} + 1 ))" 79241205Sdougb elif [ -e "saved-entropy.${n}" -o -L "saved-entropy.${n}" ]; then 80241205Sdougb logger -is -t "$0" \ 81241205Sdougb "${entropy_dir}/saved-entropy.${n}" is not a regular file, and so \ 82241205Sdougb it will not be rotated. Entropy file rotation is aborted. 83241205Sdougb exit 1 8470922Sdougb fi 85241205Sdougb n=$(( ${n} - 1 )) 8670922Sdougbdone 8770922Sdougb 88241205Sdougbdd if=/dev/random of=saved-entropy.1 bs=${entropy_save_sz} count=1 2>/dev/null 8970922Sdougb 9070922Sdougbexit 0 91