mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-02 10:42:45 +00:00
10fe5181ec
it at boot time closer to the way we want it to be in the final version. * Move the default directory to /var/db/entropy * Run the entropy saving cron job every 11 minutes. This seems to be a better default, although still bikeshed material. * Feed /dev/random some cheesy "entropy" from various commands and files before the disks are mounted. This gives /dev/random a better chance of running without blocking early. * Move the reseeding with previously stored entropy to the point immediately after the disks are mounted. * Make the harvesting script a little safer in regards to the possibility of accidentally overwriting something other than a regular file.
93 lines
2.9 KiB
Bash
Executable File
93 lines
2.9 KiB
Bash
Executable File
#!/bin/sh
|
|
#
|
|
# Copyright (c) 2001 The FreeBSD Project
|
|
# All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions
|
|
# are met:
|
|
# 1. Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# 2. Redistributions in binary form must reproduce the above copyright
|
|
# notice, this list of conditions and the following disclaimer in the
|
|
# documentation and/or other materials provided with the distribution.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
# SUCH DAMAGE.
|
|
#
|
|
# $FreeBSD$
|
|
|
|
# This script is called by cron to store bits of randomness which are
|
|
# then used to seed /dev/random on boot.
|
|
|
|
# Originally developed by Doug Barton, DougB@FreeBSD.org
|
|
|
|
PATH=/bin:/usr/bin
|
|
|
|
# If there is a global system configuration file, suck it in.
|
|
#
|
|
if [ -r /etc/defaults/rc.conf ]; then
|
|
. /etc/defaults/rc.conf
|
|
source_rc_confs
|
|
elif [ -r /etc/rc.conf ]; then
|
|
. /etc/rc.conf
|
|
fi
|
|
|
|
case ${entropy_dir} in
|
|
[Nn][Oo])
|
|
exit 0
|
|
;;
|
|
*)
|
|
entropy_dir=${entropy_dir:-/var/db/entropy}
|
|
;;
|
|
esac
|
|
|
|
entropy_save_sz=${entropy_save_sz:-2048}
|
|
entropy_save_num=${entropy_save_num:-8}
|
|
|
|
if [ ! -d "${entropy_dir}" ]; then
|
|
umask 077
|
|
mkdir "${entropy_dir}" || {
|
|
logger -is -t "$0" The entropy directory "${entropy_dir}" does not \
|
|
exist, and cannot be created. Therefore no entropy can be saved. ;
|
|
exit 1;}
|
|
/usr/sbin/chown operator:operator "${entropy_dir}"
|
|
chmod 0700 "${entropy_dir}"
|
|
fi
|
|
|
|
umask 377
|
|
|
|
for file_num in `jot ${entropy_save_num} ${entropy_save_num} 1`; do
|
|
if [ -e "${entropy_dir}/saved-entropy.${file_num}" ]; then
|
|
if [ -f "${entropy_dir}/saved-entropy.${file_num}" ]; then
|
|
new_num=$(($file_num + 1))
|
|
if [ "${new_num}" -gt "${entropy_save_num}" ]; then
|
|
rm -f "${entropy_dir}/saved-entropy.${file_num}"
|
|
else
|
|
mv "${entropy_dir}/saved-entropy.${file_num}" \
|
|
"${entropy_dir}/saved-entropy.${new_num}"
|
|
fi
|
|
else
|
|
logger -is -t "$0" \
|
|
"${entropy_dir}/saved-entropy.${file_num} is not a regular file, and therefore \
|
|
it will not be rotated. Entropy file harvesting is aborted."
|
|
exit 1
|
|
fi
|
|
fi
|
|
done
|
|
|
|
dd if=/dev/random of="${entropy_dir}/saved-entropy.1" \
|
|
bs=2048 count=1 2> /dev/null
|
|
|
|
exit 0
|
|
|