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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
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#
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# Copyright (c) 2001 The FreeBSD Project
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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# This script is called by cron to store bits of randomness which are
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# then used to seed /dev/random on boot.
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# Originally developed by Doug Barton, DougB@FreeBSD.org
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PATH=/bin:/usr/bin
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# If there is a global system configuration file, suck it in.
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#
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if [ -r /etc/defaults/rc.conf ]; then
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. /etc/defaults/rc.conf
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source_rc_confs
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elif [ -r /etc/rc.conf ]; then
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. /etc/rc.conf
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fi
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case ${entropy_dir} in
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[Nn][Oo])
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exit 0
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;;
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*)
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entropy_dir=${entropy_dir:-/var/db/entropy}
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;;
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esac
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entropy_save_sz=${entropy_save_sz:-2048}
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entropy_save_num=${entropy_save_num:-8}
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if [ ! -d "${entropy_dir}" ]; then
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umask 077
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mkdir "${entropy_dir}" || {
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logger -is -t "$0" The entropy directory "${entropy_dir}" does not \
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exist, and cannot be created. Therefore no entropy can be saved. ;
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exit 1;}
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/usr/sbin/chown operator:operator "${entropy_dir}"
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chmod 0700 "${entropy_dir}"
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fi
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umask 377
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for file_num in `jot ${entropy_save_num} ${entropy_save_num} 1`; do
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if [ -e "${entropy_dir}/saved-entropy.${file_num}" ]; then
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if [ -f "${entropy_dir}/saved-entropy.${file_num}" ]; then
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new_num=$(($file_num + 1))
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if [ "${new_num}" -gt "${entropy_save_num}" ]; then
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rm -f "${entropy_dir}/saved-entropy.${file_num}"
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else
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mv "${entropy_dir}/saved-entropy.${file_num}" \
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"${entropy_dir}/saved-entropy.${new_num}"
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fi
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else
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logger -is -t "$0" \
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"${entropy_dir}/saved-entropy.${file_num} is not a regular file, and therefore \
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it will not be rotated. Entropy file harvesting is aborted."
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exit 1
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fi
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fi
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done
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dd if=/dev/random of="${entropy_dir}/saved-entropy.1" \
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bs=2048 count=1 2> /dev/null
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exit 0
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