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# $FreeBSD: releng/11.0/usr.sbin/bsdinstall/scripts/hardening 303749 2016-08-04 17:26:32Z dim $
28
29: ${DIALOG_OK=0}
30
31echo -n > $BSDINSTALL_TMPETC/rc.conf.hardening
32
33exec 3>&1
34FEATURES=$( dialog --backtitle "FreeBSD Installer" \
35    --title "System Hardening" --nocancel --notags --separate-output \
36    --checklist "Choose system security hardening options:" \
37    0 0 0 \
38	"hide_uids" "Hide processes running as other users" ${hide_uids:-off} \
39	"hide_gids" "Hide processes running as other groups" ${hide_gids:-off} \
40	"read_msgbuf" "Disable reading kernel message buffer for unprivileged users" ${read_msgbuf:-off} \
41	"proc_debug" "Disable process debugging facilities for unprivileged users" ${proc_debug:-off} \
42	"random_pid" "Randomize the PID of newly created processes" ${random_id:-off} \
43	"stack_guard" "Insert stack guard page ahead of the growable segments" ${stack_guard:-off} \
44	"clear_tmp" "Clean the /tmp filesystem on system startup" ${clear_tmp:-off} \
45	"disable_syslogd" "Disable opening Syslogd network socket (disables remote logging)" ${disable_syslogd:-off} \
46	"disable_sendmail" "Disable Sendmail service" ${disable_sendmail:-off} \
472>&1 1>&3 )
48exec 3>&-
49
50for feature in $FEATURES; do
51	if [ "$feature" = "hide_uids" ]; then
52		echo security.bsd.see_other_uids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
53	fi
54	if [ "$feature" = "hide_gids" ]; then
55		echo security.bsd.see_other_gids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
56	fi
57	if [ "$feature" = "read_msgbuf" ]; then
58		echo security.bsd.unprivileged_read_msgbuf=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
59	fi
60	if [ "$feature" = "proc_debug" ]; then
61		echo security.bsd.unprivileged_proc_debug=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
62	fi
63	if [ "$feature" = "random_id" ]; then
64		echo kern.randompid=$(jot -r 1 9999) >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
65	fi
66	if [ "$feature" = "stack_guard" ]; then
67		echo security.bsd.stack_guard_page=1 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
68	fi
69	if [ "$feature" = "clear_tmp" ]; then
70		echo 'clear_tmp_enable="YES"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
71	fi
72	if [ "$feature" = "disable_syslogd" ]; then
73		echo 'syslogd_flags="-ss"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
74	fi
75	if [ "$feature" = "disable_sendmail" ]; then
76		echo 'sendmail_enable="NONE"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
77	fi
78done
79
80