26c4978843
Tag saved entropy files as "nodump," to signal that the files should not be backed up by dump(8) or other automated backup software that honors the file flag. Do not produce an error if the target file resides on a filesystem that does not support file flags (e.g., msdos /boot). Reviewed by: delphij Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D20358
97 lines
3.2 KiB
Bash
Executable File
97 lines
3.2 KiB
Bash
Executable File
#!/bin/sh
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#
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# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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#
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# Copyright (c) 2001-2006,2012 Douglas Barton, dougb@FreeBSD.org
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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 2>/dev/null
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elif [ -r /etc/rc.conf ]; then
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. /etc/rc.conf 2>/dev/null
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fi
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[ $(/sbin/sysctl -n security.jail.jailed) = 0 ] || exit 0
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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=${entropy_save_sz:-4096}
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entropy_save_num=${entropy_save_num:-8}
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if [ ! -d "${entropy_dir}" ]; then
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install -d -o operator -g operator -m 0700 "${entropy_dir}" || {
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logger -is -t "$0" The entropy directory "${entropy_dir}" does \
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not exist, and cannot be created. Therefore no entropy can \
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be saved.; exit 1; }
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fi
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cd "${entropy_dir}" || {
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logger -is -t "$0" Cannot cd to the entropy directory: "${entropy_dir}". \
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Entropy file rotation is aborted.; exit 1; }
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for f in saved-entropy.*; do
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case "${f}" in saved-entropy.\*) continue ;; esac # No files match
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[ ${f#saved-entropy\.} -ge ${entropy_save_num} ] && unlink ${f}
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done
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umask 377
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n=$(( ${entropy_save_num} - 1 ))
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while [ ${n} -ge 1 ]; do
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if [ -f "saved-entropy.${n}" ]; then
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mv "saved-entropy.${n}" "saved-entropy.$(( ${n} + 1 ))"
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elif [ -e "saved-entropy.${n}" -o -L "saved-entropy.${n}" ]; then
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logger -is -t "$0" \
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"${entropy_dir}/saved-entropy.${n}" is not a regular file, and so \
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it will not be rotated. Entropy file rotation is aborted.
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exit 1
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fi
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n=$(( ${n} - 1 ))
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done
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dd if=/dev/random of=saved-entropy.1 bs=${entropy_save_sz} count=1 2>/dev/null
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chflags nodump saved-entropy.1 2>/dev/null || :
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fsync saved-entropy.1 "."
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exit 0
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