diff options
Diffstat (limited to 'libexec/save-entropy')
| -rw-r--r-- | libexec/save-entropy/Makefile | 6 | ||||
| -rwxr-xr-x | libexec/save-entropy/save-entropy.sh | 92 |
2 files changed, 98 insertions, 0 deletions
diff --git a/libexec/save-entropy/Makefile b/libexec/save-entropy/Makefile new file mode 100644 index 0000000..3e27c48 --- /dev/null +++ b/libexec/save-entropy/Makefile @@ -0,0 +1,6 @@ +# $FreeBSD$ + +SCRIPTS= save-entropy.sh +NO_OBJ= + +.include <bsd.prog.mk> diff --git a/libexec/save-entropy/save-entropy.sh b/libexec/save-entropy/save-entropy.sh new file mode 100755 index 0000000..b5b37d4 --- /dev/null +++ b/libexec/save-entropy/save-entropy.sh @@ -0,0 +1,92 @@ +#!/bin/sh +# +# Copyright (c) 2001-2006 Douglas Barton, DougB@FreeBSD.org +# 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 2>/dev/null +elif [ -r /etc/rc.conf ]; then + . /etc/rc.conf 2>/dev/null +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 + +esn_m1=$(( ${entropy_save_num} - 1 )) +for file_num in `jot $esn_m1 $esn_m1 1`; do + if [ -e "${entropy_dir}/saved-entropy.${file_num}" ]; then + if [ -f "${entropy_dir}/saved-entropy.${file_num}" ]; then + new_file=saved-entropy.$(( $file_num + 1 )) + if [ -e "${entropy_dir}/${new_file}" ]; then + unlink ${entropy_dir}/${new_file} + fi + mv "${entropy_dir}/saved-entropy.${file_num}" \ + "${entropy_dir}/${new_file}" + 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="$entropy_save_sz" count=1 2> /dev/null + +exit 0 + |
