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# ----------------------------------------------------------------------------
# GIPTables Firewall v1.1 http://www.giptables.org
# Copyright (C) 2002 Adrian Pascalau <apascalau@openna.com>
# NTP module
#
# ----------------------------------------------------------------------------
# This file is part of GIPTables Firewall
#
# GIPTables Firewall is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# ----------------------------------------------------------------------------
# About NTP
# ntp 123/udp # Network Time Protocol
NTP_PORT="123"
# ----------------------------------------------------------------------------
# accept_ntp_request
# Usage: accept_ntp_request chain ntp_client_ipaddr ntp_server_ipaddr
#
accept_ntp_request ()
{
local chain=$1
local ntp_client_ipaddr=$2
local ntp_server_ipaddr=$3
$IPTABLES -A $chain -p udp \
-s $ntp_client_ipaddr --sport $NTP_PORT \
-d $ntp_server_ipaddr --dport $NTP_PORT \
-m state --state NEW,ESTABLISHED \
-j ACCEPT
$IPTABLES -A $chain -p udp \
-s $ntp_client_ipaddr --sport $UNPRIV_PORTS \
-d $ntp_server_ipaddr --dport $NTP_PORT \
-m state --state NEW,ESTABLISHED \
-j ACCEPT
return 0
}
# ----------------------------------------------------------------------------
# accept_ntp_reply
# Usage: accept_ntp_reply chain ntp_server_ipaddr ntp_client_ipaddr
#
accept_ntp_reply ()
{
local chain=$1
local ntp_server_ipaddr=$2
local ntp_client_ipaddr=$3
$IPTABLES -A $chain -p udp \
-s $ntp_server_ipaddr --sport $NTP_PORT \
-d $ntp_client_ipaddr --dport $NTP_PORT \
-m state --state ESTABLISHED \
-j ACCEPT
$IPTABLES -A $chain -p udp \
-s $ntp_server_ipaddr --sport $NTP_PORT \
-d $ntp_client_ipaddr --dport $UNPRIV_PORTS \
-m state --state ESTABLISHED \
-j ACCEPT
return 0
}
# ----------------------------------------------------------------------------
# snat_ntp_request
# Usage: snat_ntp_request interface if_ipaddr ntp_client_ipaddr ntp_server_ipaddr
#
snat_ntp_request ()
{
local interface=$1
local if_ipaddr=$2
local ntp_client_ipaddr=$3
local ntp_server_ipaddr=$4
$IPTABLES -t nat -A POSTROUTING -o $interface -p udp \
-s $ntp_client_ipaddr --sport $NTP_PORT \
-d $ntp_server_ipaddr --dport $NTP_PORT \
-j SNAT --to $if_ipaddr
$IPTABLES -t nat -A POSTROUTING -o $interface -p udp \
-s $ntp_client_ipaddr --sport $UNPRIV_PORTS \
-d $ntp_server_ipaddr --dport $NTP_PORT \
-j SNAT --to $if_ipaddr
return 0
}
# ----------------------------------------------------------------------------
# dnat_ntp_request
# Usage: dnat_ntp_request interface if_ipaddr ntp_client_ipaddr ntp_server_ipaddr
#
dnat_ntp_request ()
{
local interface=$1
local if_ipaddr=$2
local ntp_client_ipaddr=$3
local ntp_server_ipaddr=$4
$IPTABLES -t nat -A PREROUTING -i $interface -p udp \
-s $ntp_client_ipaddr --sport $NTP_PORT \
-d $if_ipaddr --dport $NTP_PORT \
-j DNAT --to $ntp_server_ipaddr
$IPTABLES -t nat -A PREROUTING -i $interface -p udp \
-s $ntp_client_ipaddr --sport $UNPRIV_PORTS \
-d $if_ipaddr --dport $NTP_PORT \
-j DNAT --to $ntp_server_ipaddr
return 0
}
# ----------------------------------------------------------------------------
# NTP outgoing client request
#
[ "$DEBUG" = "on" ] && echo -e "# NTP outgoing client request"
# Interface 0 NTP outgoing client request
[ "$INTERFACE0_NTP_CLIENT" == "yes" ] && \
[ "$DEBUG" = "on" ] && echo -e "# Interface 0 NTP outgoing client request"
[ "$INTERFACE0_NTP_CLIENT" == "yes" ] && \
for (( index = 0; index < "${#INTERFACE0_NTP_OUT_DST_IPADDR[@]}"; index++ ))
do
accept_ntp_request interface0_out ${INTERFACE0_NTP_OUT_SRC_IPADDR[$index]} ${INTERFACE0_NTP_OUT_DST_IPADDR[$index]}
accept_ntp_reply interface0_in ${INTERFACE0_NTP_OUT_DST_IPADDR[$index]} ${INTERFACE0_NTP_OUT_SRC_IPADDR[$index]}
done
# Interface 1 NTP outgoing client request
[ -n "$INTERFACE1" ] && [ "$INTERFACE1_NTP_CLIENT" == "yes" ] && \
[ "$DEBUG" = "on" ] && echo -e "# Interface 1 NTP outgoing client request"
[ -n "$INTERFACE1" ] && [ "$INTERFACE1_NTP_CLIENT" == "yes" ] && \
for (( index = 0; index < "${#INTERFACE1_NTP_OUT_DST_IPADDR[@]}"; index++ ))
do
accept_ntp_request interface1_out ${INTERFACE1_NTP_OUT_SRC_IPADDR[$index]} ${INTERFACE1_NTP_OUT_DST_IPADDR[$index]}
accept_ntp_reply interface1_in ${INTERFACE1_NTP_OUT_DST_IPADDR[$index]} ${INTERFACE1_NTP_OUT_SRC_IPADDR[$index]}
done
# Network 1 NTP forwarded outgoing client request
[ -n "$INTERFACE1" ] && [ "$NETWORK1_NTP_CLIENT" == "yes" ] && \
[ "$DEBUG" = "on" ] && echo -e "# Network 1 NTP forwarded outgoing client request"
[ -n "$INTERFACE1" ] && [ "$NETWORK1_NTP_CLIENT" == "yes" ] && \
for (( index = 0; index < "${#NETWORK1_NTP_OUT_DST_IPADDR[@]}"; index++ ))
do
[ "$NETWORK1_NAT" == "yes" ] && \
snat_ntp_request $INTERFACE0 $INTERFACE0_IPADDR ${NETWORK1_NTP_OUT_SRC_IPADDR[$index]} ${NETWORK1_NTP_OUT_DST_IPADDR[$index]}
accept_ntp_request network1_out ${NETWORK1_NTP_OUT_SRC_IPADDR[$index]} ${NETWORK1_NTP_OUT_DST_IPADDR[$index]}
accept_ntp_reply network1_in ${NETWORK1_NTP_OUT_DST_IPADDR[$index]} ${NETWORK1_NTP_OUT_SRC_IPADDR[$index]}
done
# ----------------------------------------------------------------------------
# NTP incoming client request
#
[ "$DEBUG" = "on" ] && echo -e "# NTP incoming client request"
# Interface 0 NTP incoming client request
[ "$INTERFACE0_NTP_SERVER" == "yes" ] && \
[ "$DEBUG" = "on" ] && echo -e "# Interface 0 NTP incoming client request"
[ "$INTERFACE0_NTP_SERVER" == "yes" ] && \
for (( index = 0; index < "${#INTERFACE0_NTP_IN_SRC_IPADDR[@]}"; index++ ))
do
accept_ntp_request interface0_in ${INTERFACE0_NTP_IN_SRC_IPADDR[$index]} ${INTERFACE0_NTP_IN_DST_IPADDR[$index]}
accept_ntp_reply interface0_out ${INTERFACE0_NTP_IN_DST_IPADDR[$index]} ${INTERFACE0_NTP_IN_SRC_IPADDR[$index]}
done
# Interface 1 NTP incoming client request
[ -n "$INTERFACE1" ] && [ "$INTERFACE1_NTP_SERVER" == "yes" ] && \
[ "$DEBUG" = "on" ] && echo -e "# Interface 1 NTP incoming client request"
[ -n "$INTERFACE1" ] && [ "$INTERFACE1_NTP_SERVER" == "yes" ] && \
for (( index = 0; index < "${#INTERFACE1_NTP_IN_SRC_IPADDR[@]}"; index++ ))
do
accept_ntp_request interface1_in ${INTERFACE1_NTP_IN_SRC_IPADDR[$index]} ${INTERFACE1_NTP_IN_DST_IPADDR[$index]}
accept_ntp_reply interface1_out ${INTERFACE1_NTP_IN_DST_IPADDR[$index]} ${INTERFACE1_NTP_IN_SRC_IPADDR[$index]}
done
# Network 1 NTP forwarded incoming client request
[ -n "$INTERFACE1" ] && [ "$NETWORK1_NTP_SERVER" == "yes" ] && \
[ "$DEBUG" = "on" ] && echo -e "# Network 1 NTP forwarded incoming client request"
[ -n "$INTERFACE1" ] && [ "$NETWORK1_NTP_SERVER" == "yes" ] && \
for (( index = 0; index < "${#NETWORK1_NTP_IN_SRC_IPADDR[@]}"; index++ ))
do
[ "$NETWORK1_NAT" == "yes" ] && \
dnat_ntp_request $INTERFACE0 $INTERFACE0_IPADDR ${NETWORK1_NTP_IN_SRC_IPADDR[$index]} ${NETWORK1_NTP_IN_DST_IPADDR[$index]}
accept_ntp_request network1_in ${NETWORK1_NTP_IN_SRC_IPADDR[$index]} ${NETWORK1_NTP_IN_DST_IPADDR[$index]}
accept_ntp_reply network1_out ${NETWORK1_NTP_IN_DST_IPADDR[$index]} ${NETWORK1_NTP_IN_SRC_IPADDR[$index]}
done
# ----------------------------------------------------------------------------
# End of file
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