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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/>.
# 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} GREEN "Flushing ${IP_VERSION} rules..."
${VER_IPTABLES} -F &>/dev/null
${VER_IPTABLES} -X &>/dev/null
${VER_IPTABLES} -F INPUT &>/dev/null
${VER_IPTABLES} -F OUTPUT &>/dev/null
${VER_IPTABLES} -F FORWARD &>/dev/null
${VER_IPTABLES} -t nat -F &>/dev/null
${VER_IPTABLES} -t nat -X &>/dev/null
${VER_IPTABLES} -t mangle -F &>/dev/null
${VER_IPTABLES} -t mangle -X &>/dev/null
${VER_IPTABLES} -P INPUT ACCEPT &>/dev/null
${VER_IPTABLES} -P OUTPUT ACCEPT &>/dev/null
${VER_IPTABLES} -P FORWARD ACCEPT &>/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} GREEN "Setting up chains for ${IP_VERSION}..."
${VER_IPTABLES} -N ${InPreRules}
${VER_IPTABLES} -N ${OutPreRules}
${VER_IPTABLES} -N ${InEasyBlock}
${VER_IPTABLES} -N ${OutEasyBlock}
${VER_IPTABLES} -N ${InFilter}
${VER_IPTABLES} -N ${OutFilter}
${VER_IPTABLES} -N ${FwdFilter}
${VER_IPTABLES} -N ${NAT} -t nat
${VER_IPTABLES} -N ${PortForward} -t nat
${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 ${FWCONFIGDIR}/ipv${IPVER}/custom/prerun.sh ]; then . ${FWCONFIGDIR}/ipv${IPVER}/custom/prerun.sh; fi
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Setting up InPreRules"
${VER_IPTABLES} -A INPUT -j ${InPreRules}
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Setting up OutPreRules"
${VER_IPTABLES} -A OUTPUT -j ${OutPreRules}
if [ -x ${FWCONFIGDIR}/ipv${IPVER}/custom/easyblock.sh ]; then . ${FWCONFIGDIR}/ipv${IPVER}/custom/easyblock.sh; fi
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Setting up InEasyBlock"
${VER_IPTABLES} -A INPUT -j ${InEasyBlock}
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Setting up OutEasyBlock"
${VER_IPTABLES} -A OUTPUT -j ${OutEasyBlock}
if [ -x ${FWCONFIGDIR}/ipv${IPVER}/custom/filter.sh ]; then . ${FWCONFIGDIR}/ipv${IPVER}/custom/filter.sh; fi
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Setting up InFilter"
${VER_IPTABLES} -A INPUT -j ${InFilter}
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Setting up OutFilter"
${VER_IPTABLES} -A OUTPUT -j ${OutFilter}
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Setting up FwdFilter"
${VER_IPTABLES} -A FORWARD -j ${FwdFilter}
if [ -x ${FWCONFIGDIR}/ipv${IPVER}/custom/nat.sh ]; then . ${FWCONFIGDIR}/ipv${IPVER}/custom/nat.sh; fi
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Setting up NAT"
${VER_IPTABLES} -A POSTROUTING -t nat -j ${NAT}
if [ -x ${FWCONFIGDIR}/ipv${IPVER}/custom/portfw.sh ]; then . ${FWCONFIGDIR}/ipv${IPVER}/custom/portfw.sh; fi
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Setting up PortForward"
${VER_IPTABLES} -A PREROUTING -t nat -j ${PortForward}
if [ -x ${FWCONFIGDIR}/ipv${IPVER}/custom/postrun.sh ]; then . ${FWCONFIGDIR}/ipv${IPVER}/custom/postrun.sh; fi
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Setting up InPostRules"
${VER_IPTABLES} -A INPUT -j ${InPostRules}
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Setting up OutPostRules"
${VER_IPTABLES} -A OUTPUT -j ${OutPostRules}
}
function allow_all_loopback {
IP_VERSION=$1
case $IP_VERSION in
ipv6) VER_IPTABLES=${IP6TABLES};
IPVER="6" ;;
ipv4|*) VER_IPTABLES=${IPTABLES}
IPVER="4" ;;
esac
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} loaded"
${VER_IPTABLES} -A ${InPreRules} -i lo -j ACCEPT
${VER_IPTABLES} -A ${OutPreRules} -o lo -j ACCEPT
}
function allow_trusted_hosts {
IP_VERSION=$1
case $IP_VERSION in
ipv6) VER_IPTABLES=${IP6TABLES};
IPVER="6" ;;
ipv4|*) VER_IPTABLES=${IPTABLES}
IPVER="4" ;;
esac
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} loading"
if [ -e "${FWCONFIGDIR}/ipv${IPVER}/trusted.conf" ]; then
for i in `grep -v "\#" "${FWCONFIGDIR}/ipv${IPVER}/trusted.conf"`; do
${VER_IPTABLES} -A ${InPreRules} -s $i -j ACCEPT
${VER_IPTABLES} -A ${OutPreRules} -d $i -j ACCEPT
done
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} done"
else
${display} RED "File Missing: ${FWCONFIGDIR}/ipv${IPVER}/trusted.conf"
${display} RED "Error: can not load trusted hosts file."
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} failed"
fi
}
function enable_mss_clamp {
IP_VERSION=$1
case $IP_VERSION in
ipv6) VER_IPTABLES=${IP6TABLES};
IPVER="6" ;;
ipv4|*) VER_IPTABLES=${IPTABLES}
IPVER="4" ;;
esac
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} loading"
if [ -e "${FWCONFIGDIR}/ipv${IPVER}/mss-clamp.conf" ]; then
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} read ${FWCONFIGDIR}/ipv${IPVER}/mss-clamp.conf successful"
while read -r interface mss type; do
[[ ${interface} = \#* ]] && continue
[[ ${interface} = "" ]] && continue
[[ ${mss} == "-" ]] && mss="1400:1536"
[[ ${type} == "-" ]] && type="${OutFilter}"
[[ ${type} == "out" ]] && type="${OutFilter}"
[[ ${type} == "fwd" ]] && type="${FwdFilter}"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Read: ${interface} ${mss} ${type}"
${VER_IPTABLES} -A ${type} -p tcp --tcp-flags SYN,RST SYN -j TCPMSS \
--clamp-mss-to-pmtu -o ${interface} -m tcpmss --mss ${mss}
done < "${FWCONFIGDIR}/ipv${IPVER}/mss-clamp.conf"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} done"
else
${display} RED "File Missing: ${FWCONFIGDIR}/ipv${IPVER}/mss-clamp.conf"
${display} RED "Error: can not load mss clamp file."
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} failed"
fi
}
function allow_resolvconf_servers {
IP_VERSION=$1
case $IP_VERSION in
ipv6) VER_IPTABLES=${IP6TABLES};
IPVER="6" ;;
ipv4|*) VER_IPTABLES=${IPTABLES}
IPVER="4" ;;
esac
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} loading"
[[ ${IP_VERSION} = "ipv4" ]] && ResolvConfFile="${ResolvConfv4File}"
[[ ${IP_VERSION} = "ipv6" ]] && ResolvConfFile="${ResolvConfv6File}"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Using ${ResolvConfFile} as resolv.conf"
while read -r type server; do
[[ ${type} != "nameserver" ]] && continue
[[ ${type} = "" ]] && continue
# If we see a : in the server variable, we are most likely dealing with an ipv6 address
([[ ${server} =~ ":" ]] && [[ ${IP_VERSION} = "ipv4" ]]) && continue
([[ ! ${server} =~ ":" ]] && [[ ${IP_VERSION} = "ipv6" ]]) && continue
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Added ${server} to DNS client trusted list"
${VER_IPTABLES} -A ${OutPreRules} -p udp -s ${server} --sport 1024:65535 --dport 53 -j ACCEPT
${VER_IPTABLES} -A ${InPreRules} -p udp -d ${server} --dport 1024:65535 --sport 53 -j ACCEPT
${VER_IPTABLES} -A ${OutPreRules} -p tcp -s ${server} --sport 1024:65535 --dport 53 -j ACCEPT
${VER_IPTABLES} -A ${InPreRules} -p tcp -d ${server} --dport 1024:65535 --sport 53 -j ACCEPT
done < "${ResolvConfFile}"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} done"
}
function allow_dnsclient_manual {
IP_VERSION=$1
case $IP_VERSION in
ipv6) VER_IPTABLES=${IP6TABLES};
IPVER="6" ;;
ipv4|*) VER_IPTABLES=${IPTABLES}
IPVER="4" ;;
esac
DNS_SERVERS="$2"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} loading"
for i in ${DNS_SERVERS}; do
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Added ${i} to DNS client trusted list"
${VER_IPTABLES} -A ${OutPreRules} -p udp -s ${i} --sport 1024:65535 --dport 53 -j ACCEPT
${VER_IPTABLES} -A ${InPreRules} -p udp -d ${i} --dport 1024:65535 --sport 53 -j ACCEPT
${VER_IPTABLES} -A ${OutPreRules} -p tcp -s ${i} --sport 1024:65535 --dport 53 -j ACCEPT
${VER_IPTABLES} -A ${InPreRules} -p tcp -d ${i} --dport 1024:65535 --sport 53 -j ACCEPT
done
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} done"
}
function enable_easyblock {
IP_VERSION=$1
case $IP_VERSION in
ipv6) VER_IPTABLES=${IP6TABLES};
IPVER="6" ;;
ipv4|*) VER_IPTABLES=${IPTABLES}
IPVER="4" ;;
esac
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} loading"
if [ -e "${FWCONFIGDIR}/ipv${IPVER}/easyblock.conf" ]; then
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} read ${FWCONFIGDIR}/ipv${IPVER}/easyblock.conf successful"
while read -r direction interface address port protocol; do
[[ ${direction} = \#* ]] && continue
[[ ${direction} = "" ]] && continue
([[ ${direction} != "IN" ]] && [[ ${direction} != "OUT" ]]) \
&& ${display} RED "easyblock.conf: Error - must begin with IN/OUT: ${DEFAULT_COLOR}${direction} ${interface} ${address} ${port} ${protocol}" && continue
# Do some creative work with variables to make building the iptables rules fairly painless
[[ ${port} != "-" ]] && port="--dport ${port}"
([[ ${address} != "-" ]] && [[ ${direction} == "IN" ]]) && address="-s ${address}"
([[ ${address} != "-" ]] && [[ ${direction} == "OUT" ]]) && address="-d ${address}"
([[ ${interface} != "-" ]] && [[ ${direction} == "IN" ]]) && interface="-i ${interface}"
([[ ${interface} != "-" ]] && [[ ${direction} == "OUT" ]]) && interface="-o ${interface}"
[[ ${direction} == "OUT" ]] && chain="${OutEasyBlock}"
[[ ${direction} == "IN" ]] && chain="${InEasyBlock}"
[[ ${protocol} != "-" ]] && protocol="-p ${protocol}"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} Read: ${direction} ${interface} ${address} ${port} ${protocol}"
# Blank variables that we're not going to use.
[[ ${interface} == "-" ]] && interface=""
[[ ${port} == "-" ]] && port=""
[[ ${address} == "-" ]] && address=""
[[ ${protocol} == "-" ]] && protocol=""
${VER_IPTABLES} -A ${chain} ${interface} ${address} ${protocol} ${port} -j DROP
done < "${FWCONFIGDIR}/ipv${IPVER}/easyblock.conf"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} done"
fi
}
function enable_filtering {
IP_VERSION=$1
case $IP_VERSION in
ipv6) VER_IPTABLES=${IP6TABLES};
IPVER="6" ;;
ipv4|*) VER_IPTABLES=${IPTABLES}
IPVER="4" ;;
esac
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} loading"
if [ -e "${FWCONFIGDIR}/ipv${IPVER}/acl.conf" ]; then
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} read ${FWCONFIGDIR}/ipv${IPVER}/acl.conf successful"
while read -r direction action interface srcaddress srcport dstaddress dstport protocol; do
[[ ${direction} = \#* ]] && continue
[[ ${direction} = "" ]] && continue
([[ ${direction} != "IN" ]] && [[ ${direction} != "OUT" ]]) \
&& ${display} RED "acl.conf: Error - must begin with IN/OUT: ${DEFAULT_COLOR}${direction} ${action} ${interface} ${dstaddress} ${dstport} ${srcaddress} ${srcport} ${protocol}" && continue
# Do some creative work with variables to make building the iptables rules fairly painless
[[ ${dstport} != "-" ]] && dstport="--dport ${dstport}"
[[ ${srcport} != "-" ]] && srcport="--sport ${srcport}"
[[ ${srcaddress} != "-" ]] && srcaddress="-s ${srcaddress}"
[[ ${dstaddress} != "-" ]] && dstaddress="-d ${dstaddress}"
([[ ${interface} != "-" ]] && [[ ${direction} == "IN" ]]) && interface="-i ${interface}"
([[ ${interface} != "-" ]] && [[ ${direction} == "OUT" ]]) && interface="-o ${interface}"
[[ ${direction} == "OUT" ]] && chain="${OutFilter}"
[[ ${direction} == "IN" ]] && chain="${InFilter}"
[[ ${protocol} != "-" ]] && protocol="-p ${protocol}"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR}${direction} ${action} ${interface} ${srcaddress} ${srcport} ${dstaddress} ${dstport} ${protocol}"
# Blank variables that we're not going to use.
[[ ${interface} == "-" ]] && interface=""
[[ ${dstport} == "-" ]] && dstport=""
[[ ${srcport} == "-" ]] && srcport=""
[[ ${dstaddress} == "-" ]] && dstaddress=""
[[ ${srcaddress} == "-" ]] && srcaddress=""
[[ ${protocol} == "-" ]] && protocol=""
${VER_IPTABLES} -A ${chain} ${interface} ${protocol} ${srcaddress} ${srcport} ${dstaddress} ${dstport} -j ${action}
done < "${FWCONFIGDIR}/ipv${IPVER}/acl.conf"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} done"
fi
}