xref: /freebsd-11.0-release/usr.sbin/bsdinstall/scripts/hardening

#!/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
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# $FreeBSD: releng/11.0/usr.sbin/bsdinstall/scripts/hardening 303749 2016-08-04 17:26:32Z dim $

: ${DIALOG_OK=0}

echo -n > $BSDINSTALL_TMPETC/rc.conf.hardening

exec 3>&1
FEATURES=$( dialog --backtitle "FreeBSD Installer" \
    --title "System Hardening" --nocancel --notags --separate-output \
    --checklist "Choose system security hardening options:" \
    0 0 0 \
	"hide_uids" "Hide processes running as other users" ${hide_uids:-off} \
	"hide_gids" "Hide processes running as other groups" ${hide_gids:-off} \
	"read_msgbuf" "Disable reading kernel message buffer for unprivileged users" ${read_msgbuf:-off} \
	"proc_debug" "Disable process debugging facilities for unprivileged users" ${proc_debug:-off} \
	"random_pid" "Randomize the PID of newly created processes" ${random_id:-off} \
	"stack_guard" "Insert stack guard page ahead of the growable segments" ${stack_guard:-off} \
	"clear_tmp" "Clean the /tmp filesystem on system startup" ${clear_tmp:-off} \
	"disable_syslogd" "Disable opening Syslogd network socket (disables remote logging)" ${disable_syslogd:-off} \
	"disable_sendmail" "Disable Sendmail service" ${disable_sendmail:-off} \
2>&1 1>&3 )
exec 3>&-

for feature in $FEATURES; do
	if [ "$feature" = "hide_uids" ]; then
		echo security.bsd.see_other_uids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
	fi
	if [ "$feature" = "hide_gids" ]; then
		echo security.bsd.see_other_gids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
	fi
	if [ "$feature" = "read_msgbuf" ]; then
		echo security.bsd.unprivileged_read_msgbuf=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
	fi
	if [ "$feature" = "proc_debug" ]; then
		echo security.bsd.unprivileged_proc_debug=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
	fi
	if [ "$feature" = "random_id" ]; then
		echo kern.randompid=$(jot -r 1 9999) >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
	fi
	if [ "$feature" = "stack_guard" ]; then
		echo security.bsd.stack_guard_page=1 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
	fi
	if [ "$feature" = "clear_tmp" ]; then
		echo 'clear_tmp_enable="YES"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
	fi
	if [ "$feature" = "disable_syslogd" ]; then
		echo 'syslogd_flags="-ss"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
	fi
	if [ "$feature" = "disable_sendmail" ]; then
		echo 'sendmail_enable="NONE"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
	fi
done