3 # Copyright (c) 2001-2006 Douglas Barton, DougB@FreeBSD.org
6 # Redistribution and use in source and binary forms, with or without
7 # modification, are permitted provided that the following conditions
9 # 1. Redistributions of source code must retain the above copyright
10 # notice, this list of conditions and the following disclaimer.
11 # 2. Redistributions in binary form must reproduce the above copyright
12 # notice, this list of conditions and the following disclaimer in the
13 # documentation and/or other materials provided with the distribution.
15 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 # This script is called by cron to store bits of randomness which are
30 # then used to seed /dev/random on boot.
32 # Originally developed by Doug Barton, DougB@FreeBSD.org
36 # If there is a global system configuration file, suck it in.
38 if [ -r /etc/defaults/rc.conf ]; then
39 . /etc/defaults/rc.conf
40 source_rc_confs 2>/dev/null
41 elif [ -r /etc/rc.conf ]; then
42 . /etc/rc.conf 2>/dev/null
45 case ${entropy_dir} in
50 entropy_dir=${entropy_dir:-/var/db/entropy}
54 entropy_save_sz=${entropy_save_sz:-2048}
55 entropy_save_num=${entropy_save_num:-8}
57 if [ ! -d "${entropy_dir}" ]; then
59 mkdir "${entropy_dir}" || {
60 logger -is -t "$0" The entropy directory "${entropy_dir}" does not \
61 exist, and cannot be created. Therefore no entropy can be saved. ;
63 /usr/sbin/chown operator:operator "${entropy_dir}"
64 chmod 0700 "${entropy_dir}"
69 esn_m1=$(( ${entropy_save_num} - 1 ))
70 for file_num in `jot $esn_m1 $esn_m1 1`; do
71 if [ -e "${entropy_dir}/saved-entropy.${file_num}" ]; then
72 if [ -f "${entropy_dir}/saved-entropy.${file_num}" ]; then
73 new_file=saved-entropy.$(( $file_num + 1 ))
74 if [ -e "${entropy_dir}/${new_file}" ]; then
75 unlink ${entropy_dir}/${new_file}
77 mv "${entropy_dir}/saved-entropy.${file_num}" \
78 "${entropy_dir}/${new_file}"
81 "${entropy_dir}/saved-entropy.${file_num} is not a regular file, and therefore \
82 it will not be rotated. Entropy file harvesting is aborted."
88 dd if=/dev/random of="${entropy_dir}/saved-entropy.1" \
89 bs="$entropy_save_sz" count=1 2> /dev/null