SRFirewall/lib/iptables.inc

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#!/bin/bash
# By Brielle Bruns <bruns@2mbit.com>
# URL: http://www.sosdg.org/freestuff/firewall
# License: GPLv3
#
# Copyright (C) 2009 - 2014 Brielle Bruns
# Copyright (C) 2009 - 2014 The Summit Open Source Development Group
#
# 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/>.
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# iptables_rules_flush (ipv6|ipv4)
# Clear all rules from iptables - be very careful in how this is called as it
# could easily lock out the user from the network. Best way to be safe, is to
# call iptables_policy_reset first then this function.
function iptables_rules_flush {
IP_VERSION=$1
case $IP_VERSION in
ipv6) VER_IPTABLES=${IP6TABLES} ; TABLE_NAMES=/proc/net/ip6_tables_names ;;
ipv4|*) VER_IPTABLES=${IPTABLES} ; TABLE_NAMES=/proc/net/ip_tables_names ;;
esac
${display_c} RED "Flushing ${IP_VERSION} rules..."
${VER_IPTABLES} --flush &>/dev/null
${VER_IPTABLES} -F OUTPUT &>/dev/null
${VER_IPTABLES} -F PREROUTING &>/dev/null
${VER_IPTABLES} -F POSTROUTING &>/dev/null
for i in `cat $TABLE_NAMES`; do
${VER_IPTABLES} -F -t $i &>/dev/null
done
${VER_IPTABLES} -X
}
# iptables_policy_set (ipv6|ipv4) (ACCEPT|DROP)
# Sets all policy rules to either ACCEPT or DROP for ipv4 or ipv6
# If no policy given, assume ACCEPT
function iptables_policy_reset {
IP_VERSION=$1
SET_POLICY=${2=ACCEPT}
case $IP_VERSION in
ipv6) VER_IPTABLES=${IP6TABLES} ;;
ipv4|*) VER_IPTABLES=${IPTABLES} ;;
esac
${display_c} RED "Setting ${IP_VERSION} policies to ${SET_POLICY}..."
${VER_IPTABLES} --policy INPUT ${SET_POLICY}
${VER_IPTABLES} --policy OUTPUT ${SET_POLICY}
${VER_IPTABLES} --policy FORWARD ${SET_POLICY}
}
# setup_iptables_chains (ipv4|ipv6)
# Creates the default chains when called
function setup_iptables_chains {
IP_VERSION=$1
case $IP_VERSION in
ipv6) VER_IPTABLES=${IP6TABLES};
IPVER="6" ;;
ipv4|*) VER_IPTABLES=${IPTABLES}
IPVER="4" ;;
esac
# Create the actual chains
${display_c} GREEN "Setting up chains for ${IP_VERSION}..."
${VER_IPTABLES} -N ${InPreRules}
${VER_IPTABLES} -N ${OutPreRules}
${VER_IPTABLES} -N ${Trusted}
${VER_IPTABLES} -N ${InEasyBlock}
${VER_IPTABLES} -N ${OutEasyBlock}
${VER_IPTABLES} -N ${InFilter}
${VER_IPTABLES} -N ${OutFilter}
${VER_IPTABLES} -N ${FwdFilter}
${VER_IPTABLES} -N ${NAT}
${VER_IPTABLES} -N ${PortForward}
${VER_IPTABLES} -N ${InPostRules}
${VER_IPTABLES} -N ${OutPostRules}
# Set up rules - the order matters - we do it separately here
# for easy viewing of order
if [ -x ${v${IPVER}_Custom_Pre} ]; then . ${v${IPVER}_Custom_Pre}; fi
${VER_IPTABLES} -A INPUT -j ${InPreRules}
${VER_IPTABLES} -A OUTPUT -j ${OutPreRules}
if [ -x ${v${IPVER}_Custom_Trust} ]; then . ${v${IPVER}_Custom_Trust}; fi
${VER_IPTABLES} -A INPUT -j ${Trusted}
if [ -x ${v${IPVER}_Custom_EasyBlock} ]; then . ${v${IPVER}_Custom_EasyBlock}; fi
${VER_IPTABLES} -A INPUT -j ${InEasyBlock}
${VER_IPTABLES} -A OUTPUT -j ${OutEasyBlock}
if [ -x ${v${IPVER}_Custom_Filter} ]; then . ${v${IPVER}_Custom_Filter}; fi
${VER_IPTABLES} -A INPUT -j ${InFilter}
${VER_IPTABLES} -A OUTPUT -j ${OutFilter}
${VER_IPTABLES} -A FORWARD -j ${FwdFilter}
if [ -x ${v${IPVER}_Custom_NAT} ]; then . ${v${IPVER}_Custom_NAT}; fi
${VER_IPTABLES} -A POSTROUTING -j ${NAT}
if [ -x ${v${IPVER}_Custom_PortFw} ]; then . ${v${IPVER}_Custom_PortFw}; fi
${VER_IPTABLES} -A PREROUTING -j ${PortForward}
if [ -x ${v${IPVER}_Custom_Post} ]; then . ${v${IPVER}_Custom_Post}; fi
${VER_IPTABLES} -A INPUT -j ${InPostRules}
${VER_IPTABLES} -A OUTPUT -j ${OutPostRules}
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}