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#!/bin/sh
#-
# Copyright (c) 2016 Bartek Rutkowski
# 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.
#
BSDCFG_SHARE="/usr/share/bsdconfig"
. $BSDCFG_SHARE/common.subr || exit 1
: ${BSDDIALOG_OK=0}
echo -n > $BSDINSTALL_TMPETC/rc.conf.hardening
echo -n > $BSDINSTALL_TMPETC/sysctl.conf.hardening
echo -n > $BSDINSTALL_TMPBOOT/loader.conf.hardening
exec 5>&1
FEATURES=$( bsddialog --backtitle "$OSNAME Installer" \
--title "System Hardening" --nocancel --separate-output \
--checklist "Choose system security hardening options:" \
0 0 0 \
"0 hide_uids" "Hide processes running as other users" ${hide_uids:-off} \
"1 hide_gids" "Hide processes running as other groups" ${hide_gids:-off} \
"2 hide_jail" "Hide processes running in jails" ${hide_jail:-off} \
"3 read_msgbuf" "Disable reading kernel message buffer for unprivileged users" ${read_msgbuf:-off} \
"4 proc_debug" "Disable process debugging facilities for unprivileged users" ${proc_debug:-off} \
"5 random_pid" "Randomize the PID of newly created processes" ${random_pid:-off} \
"6 clear_tmp" "Clean the /tmp filesystem on system startup" ${clear_tmp:-off} \
"7 disable_syslogd" "Disable opening Syslogd network socket (disables remote logging)" ${disable_syslogd:-off} \
"8 secure_console" "Enable console password prompt" ${secure_console:-off} \
"9 disable_ddtrace" "Disallow DTrace destructive-mode" ${disable_ddtrace:-off} \
2>&1 1>&5 )
retval=$?
exec 5>&-
if [ $retval -ne $BSDDIALOG_OK ]; then
exit 1
fi
for feature in $FEATURES; do
case "$feature" in
hide_uids)
echo security.bsd.see_other_uids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
;;
hide_gids)
echo security.bsd.see_other_gids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
;;
hide_jail)
echo security.bsd.see_jail_proc=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
;;
read_msgbuf)
echo security.bsd.unprivileged_read_msgbuf=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
;;
proc_debug)
echo security.bsd.unprivileged_proc_debug=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
;;
random_pid)
echo kern.randompid=1 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
;;
clear_tmp)
echo 'clear_tmp_enable="YES"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
;;
disable_syslogd)
echo 'syslogd_flags="-ss"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
;;
secure_console)
sed "s/unknown off secure/unknown off insecure/g" $BSDINSTALL_CHROOT/etc/ttys > $BSDINSTALL_TMPETC/ttys.hardening
;;
disable_ddtrace)
echo 'security.bsd.allow_destructive_dtrace=0' >> $BSDINSTALL_TMPBOOT/loader.conf.hardening
;;
esac
done
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