3 files changed, 93 insertions, 0 deletions

diff --git a/libexec/Makefile b/libexec/Makefile
index c051e13ff89e..6ee31ed4ab73 100644
--- a/libexec/Makefile
+++ b/libexec/Makefile
@@ -22,6 +22,7 @@ SUBDIR=	atrun \
 	rpc.rwalld \
 	rpc.sprayd \
 	rshd \
+	save-entropy \
 	talkd \
 	tftpd \
 	xtend \
diff --git a/libexec/save-entropy/Makefile b/libexec/save-entropy/Makefile
new file mode 100644
index 000000000000..c3de2caaf45c
--- /dev/null
+++ b/libexec/save-entropy/Makefile
@@ -0,0 +1,10 @@
+# $FreeBSD$
+
+NOMAN=	noman
+
+beforeinstall:
+	${INSTALL} -c -o operator -g operator -m 500 \
+	    ${.CURDIR}/save-entropy.sh ${DESTDIR}${BINDIR}/save-entropy
+
+.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 000000000000..4a84fd741959
--- /dev/null
+++ b/libexec/save-entropy/save-entropy.sh
@@ -0,0 +1,82 @@
+#!/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.
+
+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:-/.entropy}
+	;;
+esac
+
+entropy_save_sz=${entropy_save_sz:-2048}
+entropy_save_num=${entropy_save_num:-8}
+entropy_save_jot=$(($entropy_save_num - 1))
+
+if [ ! -d "${entropy_dir}" ]; then
+	umask 077
+	mkdir "${entropy_dir}" || {
+	    logger -is 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 "${entropy_dir}"
+fi
+
+rm -f "${entropy_dir}/saved-entropy.${entropy_save_num}"
+
+umask 377
+
+for file_num in `jot ${entropy_save_jot} ${entropy_save_jot} 1`; do
+	if [ -f "${entropy_dir}/saved-entropy.${file_num}" ]; then
+		new_num=$(($file_num + 1))
+		mv "${entropy_dir}/saved-entropy.${file_num}" \
+		    "${entropy_dir}/saved-entropy.${new_num}"
+	fi
+done
+
+dd if=/dev/random of="${entropy_dir}/saved-entropy.1" \
+    bs=2048 count=1 2> /dev/null
+
+exit 0
+