usr.sbin/bsdinstall/scripts/hardening

   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 # $FreeBSD$
  28
  29 BSDCFG_SHARE="/usr/share/bsdconfig"
  30 . $BSDCFG_SHARE/common.subr || exit 1
  31
  32 : ${BSDDIALOG_OK=0}
  33
  34 echo -n > $BSDINSTALL_TMPETC/rc.conf.hardening
  35 echo -n > $BSDINSTALL_TMPETC/sysctl.conf.hardening
  36 echo -n > $BSDINSTALL_TMPBOOT/loader.conf.hardening
  37
  38 exec 3>&1
  39 FEATURES=$( bsddialog --backtitle "$OSNAME Installer" \
  40     --title "System Hardening" --nocancel --separate-output \
  41     --checklist "Choose system security hardening options:" \
  42     0 0 0 \
  43         "0 hide_uids" "Hide processes running as other users" ${hide_uids:-off} \
  44         "1 hide_gids" "Hide processes running as other groups" ${hide_gids:-off} \
  45         "2 hide_jail" "Hide processes running in jails" ${hide_jail:-off} \
  46         "3 read_msgbuf" "Disable reading kernel message buffer for unprivileged users" ${read_msgbuf:-off} \
  47         "4 proc_debug" "Disable process debugging facilities for unprivileged users" ${proc_debug:-off} \
  48         "5 random_pid" "Randomize the PID of newly created processes" ${random_pid:-off} \
  49         "6 clear_tmp" "Clean the /tmp filesystem on system startup" ${clear_tmp:-off} \
  50         "7 disable_syslogd" "Disable opening Syslogd network socket (disables remote logging)" ${disable_syslogd:-off} \
  51         "8 secure_console" "Enable console password prompt" ${secure_console:-off} \
  52         "9 disable_ddtrace" "Disallow DTrace destructive-mode" ${disable_ddtrace:-off} \
  53 2>&1 1>&3 )
  54 retval=$?
  55 exec 3>&-
  56
  57 if [ $retval -ne $BSDDIALOG_OK ]; then
  58         exit 1
  59 fi
  60
  61 for feature in $FEATURES; do
  62         case "$feature" in
  63         hide_uids)
  64                 echo security.bsd.see_other_uids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
  65                 ;;
  66         hide_gids)
  67                 echo security.bsd.see_other_gids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
  68                 ;;
  69         hide_jail)
  70                 echo security.bsd.see_jail_proc=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
  71                 ;;
  72         read_msgbuf)
  73                 echo security.bsd.unprivileged_read_msgbuf=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
  74                 ;;
  75         proc_debug)
  76                 echo security.bsd.unprivileged_proc_debug=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
  77                 ;;
  78         random_pid)
  79                 echo kern.randompid=1 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
  80                 ;;
  81         clear_tmp)
  82                 echo 'clear_tmp_enable="YES"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
  83                 ;;
  84         disable_syslogd)
  85                 echo 'syslogd_flags="-ss"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
  86                 ;;
  87         secure_console)
  88                 sed "s/unknown  off secure/unknown      off insecure/g" $BSDINSTALL_CHROOT/etc/ttys > $BSDINSTALL_TMPETC/ttys.hardening
  89                 ;;
  90         disable_ddtrace)
  91                 echo 'security.bsd.allow_destructive_dtrace=0' >> $BSDINSTALL_TMPBOOT/loader.conf.hardening
  92                 ;;
  93         esac
  94 done