1#!/bin/sh
2#-
3# Copyright (c) 2016 Bartek Rutkowski
4# All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions
8# are met:
9# 1. Redistributions of source code must retain the above copyright
10#    notice, this list of conditions and the following disclaimer.
11# 2. Redistributions in binary form must reproduce the above copyright
12#    notice, this list of conditions and the following disclaimer in the
13#    documentation and/or other materials provided with the distribution.
14#
15# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25# SUCH DAMAGE.
26#
27
28BSDCFG_SHARE="/usr/share/bsdconfig"
29. $BSDCFG_SHARE/common.subr || exit 1
30
31: ${BSDDIALOG_OK=0}
32
33echo -n > $BSDINSTALL_TMPETC/rc.conf.hardening
34echo -n > $BSDINSTALL_TMPETC/sysctl.conf.hardening
35echo -n > $BSDINSTALL_TMPBOOT/loader.conf.hardening
36
37exec 3>&1
38FEATURES=$( bsddialog --backtitle "$OSNAME Installer" \
39    --title "System Hardening" --nocancel --separate-output \
40    --checklist "Choose system security hardening options:" \
41    0 0 0 \
42	"0 hide_uids" "Hide processes running as other users" ${hide_uids:-off} \
43	"1 hide_gids" "Hide processes running as other groups" ${hide_gids:-off} \
44	"2 hide_jail" "Hide processes running in jails" ${hide_jail:-off} \
45	"3 read_msgbuf" "Disable reading kernel message buffer for unprivileged users" ${read_msgbuf:-off} \
46	"4 proc_debug" "Disable process debugging facilities for unprivileged users" ${proc_debug:-off} \
47	"5 random_pid" "Randomize the PID of newly created processes" ${random_pid:-off} \
48	"6 clear_tmp" "Clean the /tmp filesystem on system startup" ${clear_tmp:-off} \
49	"7 disable_syslogd" "Disable opening Syslogd network socket (disables remote logging)" ${disable_syslogd:-off} \
50	"8 secure_console" "Enable console password prompt" ${secure_console:-off} \
51	"9 disable_ddtrace" "Disallow DTrace destructive-mode" ${disable_ddtrace:-off} \
522>&1 1>&3 )
53retval=$?
54exec 3>&-
55
56if [ $retval -ne $BSDDIALOG_OK ]; then
57	exit 1
58fi
59
60for feature in $FEATURES; do
61	case "$feature" in
62	hide_uids)
63		echo security.bsd.see_other_uids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
64		;;
65	hide_gids)
66		echo security.bsd.see_other_gids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
67		;;
68	hide_jail)
69		echo security.bsd.see_jail_proc=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
70		;;
71	read_msgbuf)
72		echo security.bsd.unprivileged_read_msgbuf=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
73		;;
74	proc_debug)
75		echo security.bsd.unprivileged_proc_debug=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
76		;;
77	random_pid)
78		echo kern.randompid=1 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
79		;;
80	clear_tmp)
81		echo 'clear_tmp_enable="YES"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
82		;;
83	disable_syslogd)
84		echo 'syslogd_flags="-ss"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
85		;;
86	secure_console)
87		sed "s/unknown	off secure/unknown	off insecure/g" $BSDINSTALL_CHROOT/etc/ttys > $BSDINSTALL_TMPETC/ttys.hardening
88		;;
89	disable_ddtrace)
90		echo 'security.bsd.allow_destructive_dtrace=0' >> $BSDINSTALL_TMPBOOT/loader.conf.hardening
91		;;
92	esac
93done
94