Author: obrien
Date: Wed Aug 22 18:43:21 2012
New Revision: 239569
URL: http://svn.freebsd.org/changeset/base/239569
Log:
Remove old entropy seeding after consumption initializing /dev/random PRNG.
Not doing so opens us up to replay attacks.
Submitted by: Arthur Mesh <arthurm...@gmail.com>
Sponsored by: Juniper Networks
Added:
head/etc/rc.d/postrandom (contents, props changed)
Modified:
head/etc/rc.d/random
Added: head/etc/rc.d/postrandom
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/etc/rc.d/postrandom Wed Aug 22 18:43:21 2012 (r239569)
@@ -0,0 +1,41 @@
+#!/bin/sh
+#
+# $FreeBSD$
+#
+
+# PROVIDE: postrandom
+# REQUIRE: initrandom random var
+# BEFORE: LOGIN
+# KEYWORD: nojail
+
+. /etc/rc.subr
+
+name="postrandom"
+start_cmd="${name}_start"
+stop_cmd=":"
+
+# This will remove old ${entropy_file} and generate a new one.
+# According to Bruce Schneier, this is stronly recomended in order
+# to avoid using same ${entropy_file} across reboots.
+# Reference: Chapter 10.6, Practical Cryptograpy, ISBN: 0-471-22357-3
+
+postrandom_start()
+{
+ /etc/rc.d/random fastsaveseed
+
+ case ${entropy_dir} in
+ [Nn][Oo])
+ ;;
+ *)
+ entropy_dir=${entropy_dir:-/var/db/entropy}
+ if [ -d "${entropy_dir}" ]; then
+ if [ -w /dev/random ]; then
+ rm -f ${entropy_dir}/*
+ fi
+ fi
+ ;;
+ esac
+}
+
+load_rc_config random
+run_rc_command "$1"
Modified: head/etc/rc.d/random
==============================================================================
--- head/etc/rc.d/random Wed Aug 22 18:35:17 2012 (r239568)
+++ head/etc/rc.d/random Wed Aug 22 18:43:21 2012 (r239569)
@@ -4,7 +4,7 @@
#
# PROVIDE: random
-# REQUIRE: var initrandom
+# REQUIRE: initrandom var
# BEFORE: netif
# KEYWORD: nojail shutdown
@@ -14,6 +14,9 @@ name="random"
start_cmd="random_start"
stop_cmd="random_stop"
+extra_commands="saveseed"
+saveseed_cmd="${name}_stop"
+
feed_dev_random()
{
if [ -f "${1}" -a -r "${1}" -a -s "${1}" ]; then
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