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usr.sbin/bsdinstall/scripts/hardening

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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE. # SUCH DAMAGE.
# #
# $FreeBSD$ # $FreeBSD$
: ${DIALOG_OK=0} : ${DIALOG_OK=0}
echo -n > $BSDINSTALL_TMPETC/rc.conf.hardening echo -n > $BSDINSTALL_TMPETC/rc.conf.hardening
echo -n > $BSDINSTALL_TMPETC/sysctl.conf.hardening
exec 3>&1 exec 3>&1
FEATURES=$( dialog --backtitle "FreeBSD Installer" \ FEATURES=$( dialog --backtitle "FreeBSD Installer" \
--title "System Hardening" --nocancel --notags --separate-output \ --title "System Hardening" --nocancel --notags --separate-output \
--checklist "Choose system security hardening options:" \ --checklist "Choose system security hardening options:" \
0 0 0 \ 0 0 0 \
"hide_uids" "Hide processes running as other users" ${hide_uids:-off} \ "hide_uids" "Hide processes running as other users" ${hide_uids:-off} \
"hide_gids" "Hide processes running as other groups" ${hide_gids:-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} \ "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} \ "proc_debug" "Disable process debugging facilities for unprivileged users" ${proc_debug:-off} \
"random_pid" "Randomize the PID of newly created processes" ${random_id:-off} \ "random_pid" "Randomize the PID of newly created processes" ${random_pid:-off} \
"stack_guard" "Insert stack guard page ahead of the growable segments" ${stack_guard:-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} \ "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_syslogd" "Disable opening Syslogd network socket (disables remote logging)" ${disable_syslogd:-off} \
"disable_sendmail" "Disable Sendmail service" ${disable_sendmail:-off} \ "disable_sendmail" "Disable Sendmail service" ${disable_sendmail:-off} \
2>&1 1>&3 ) 2>&1 1>&3 )
exec 3>&- exec 3>&-
for feature in $FEATURES; do for feature in $FEATURES; do
if [ "$feature" = "hide_uids" ]; then if [ "$feature" = "hide_uids" ]; then
echo security.bsd.see_other_uids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening echo security.bsd.see_other_uids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
fi fi
if [ "$feature" = "hide_gids" ]; then if [ "$feature" = "hide_gids" ]; then
echo security.bsd.see_other_gids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening echo security.bsd.see_other_gids=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
fi fi
if [ "$feature" = "read_msgbuf" ]; then if [ "$feature" = "read_msgbuf" ]; then
echo security.bsd.unprivileged_read_msgbuf=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening echo security.bsd.unprivileged_read_msgbuf=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
fi fi
if [ "$feature" = "proc_debug" ]; then if [ "$feature" = "proc_debug" ]; then
echo security.bsd.unprivileged_proc_debug=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening echo security.bsd.unprivileged_proc_debug=0 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
fi fi
if [ "$feature" = "random_id" ]; then if [ "$feature" = "random_pid" ]; then
echo kern.randompid=$(jot -r 1 9999) >> $BSDINSTALL_TMPETC/sysctl.conf.hardening echo kern.randompid=$(jot -r 1 9999) >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
allanjudeUnsubmitted
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is there a reason this is 9999 not 99999?

allanjude: is there a reason this is 9999 not 99999?
allanjudeUnsubmitted
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it doesn't work the way I thought, so the current value is fine

allanjude: it doesn't work the way I thought, so the current value is fine
fi fi
if [ "$feature" = "stack_guard" ]; then if [ "$feature" = "stack_guard" ]; then
echo security.bsd.stack_guard_page=1 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening echo security.bsd.stack_guard_page=1 >> $BSDINSTALL_TMPETC/sysctl.conf.hardening
fi fi
if [ "$feature" = "clear_tmp" ]; then if [ "$feature" = "clear_tmp" ]; then
echo 'clear_tmp_enable="YES"' >> $BSDINSTALL_TMPETC/rc.conf.hardening echo 'clear_tmp_enable="YES"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
fi fi
if [ "$feature" = "disable_syslogd" ]; then if [ "$feature" = "disable_syslogd" ]; then
echo 'syslogd_flags="-ss"' >> $BSDINSTALL_TMPETC/rc.conf.hardening echo 'syslogd_flags="-ss"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
fi fi
if [ "$feature" = "disable_sendmail" ]; then if [ "$feature" = "disable_sendmail" ]; then
echo 'sendmail_enable="NONE"' >> $BSDINSTALL_TMPETC/rc.conf.hardening echo 'sendmail_enable="NONE"' >> $BSDINSTALL_TMPETC/rc.conf.hardening
fi fi
done done