Move all packages to root.

[people/arne_f/ipfire-3.x.git] / firewall / src / functions.firewall

#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2009  Michael Tremer & Christian Schmidt                      #
#                                                                             #
# This program 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 3 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, see <http://www.gnu.org/licenses/>.       #
#                                                                             #
###############################################################################

function firewall_init() {
	decho "Initializing firewall interface."
	iptables_init
	firewall_tcp_state_flags
	firewall_connection_tracking
}

function firewall_tcp_state_flags() {
	vecho "Adding ${BOLD}TCP State Flags${NORMAL} chain..."
	chain_create BADTCP_LOG
	iptables -A BADTCP_LOG -p tcp -j $(iptables_LOG "Illegal TCP state: ")
	iptables -A BADTCP_LOG -j DROP

	chain_create BADTCP
	iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j BADTCP_LOG
	iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j BADTCP_LOG
	iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j BADTCP_LOG
	iptables -A BADTCP -p tcp --tcp-flags FIN,RST FIN,RST -j BADTCP_LOG
	iptables -A BADTCP -p tcp --tcp-flags ACK,FIN FIN     -j BADTCP_LOG
	iptables -A BADTCP -p tcp --tcp-flags ACK,PSH PSH     -j BADTCP_LOG
	iptables -A BADTCP -p tcp --tcp-flags ACK,URG URG     -j BADTCP_LOG

	iptables -A INPUT   -p tcp -j BADTCP
	iptables -A OUTPUT  -p tcp -j BADTCP
	iptables -A FORWARD -p tcp -j BADTCP
}

function firewall_connection_tracking() {
	vecho "Adding ${BOLD}Connection Tracking${NORMAL} chain..."
	chain_create CONNTRACK
	iptables -A CONNTRACK -m state --state ESTABLISHED,RELATED -j ACCEPT
	iptables -A CONNTRACK -m state --state INVALID -j $(iptables_LOG "INVALID packet: ")
	iptables -A CONNTRACK -m state --state INVALID -j DROP

	iptables -A INPUT   -p tcp -j CONNTRACK
	iptables -A OUTPUT  -p tcp -j CONNTRACK
	iptables -A FORWARD -p tcp -j CONNTRACK
}