273 lines
11 KiB
Bash
273 lines
11 KiB
Bash
#!/bin/bash
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# By Brielle Bruns <bruns@2mbit.com>
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# URL: http://www.sosdg.org/freestuff/firewall
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# License: GPLv3
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#
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# Copyright (C) 2009 - 2014 Brielle Bruns
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# Copyright (C) 2009 - 2014 The Summit Open Source Development Group
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# iptables_rules_flush (ipv6|ipv4)
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# Clear all rules from iptables - be very careful in how this is called as it
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# could easily lock out the user from the network. Best way to be safe, is to
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# call iptables_policy_reset first then this function.
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function iptables_rules_flush {
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IP_VERSION=$1
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case $IP_VERSION in
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ipv6) VER_IPTABLES=${IP6TABLES} ; TABLE_NAMES=/proc/net/ip6_tables_names ;;
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ipv4|*) VER_IPTABLES=${IPTABLES} ; TABLE_NAMES=/proc/net/ip_tables_names ;;
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esac
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${display} GREEN "Flushing ${IP_VERSION} rules..."
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${VER_IPTABLES} -F &>/dev/null
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${VER_IPTABLES} -X &>/dev/null
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${VER_IPTABLES} -F INPUT &>/dev/null
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${VER_IPTABLES} -F OUTPUT &>/dev/null
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${VER_IPTABLES} -F FORWARD &>/dev/null
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${VER_IPTABLES} -t nat -F &>/dev/null
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${VER_IPTABLES} -t nat -X &>/dev/null
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${VER_IPTABLES} -t mangle -F &>/dev/null
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${VER_IPTABLES} -t mangle -X &>/dev/null
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${VER_IPTABLES} -P INPUT ACCEPT &>/dev/null
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${VER_IPTABLES} -P OUTPUT ACCEPT &>/dev/null
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${VER_IPTABLES} -P FORWARD ACCEPT &>/dev/null
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#for i in `cat $TABLE_NAMES`; do
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# ${VER_IPTABLES} -F -t $i &>/dev/null
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#done
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#${VER_IPTABLES} -X
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}
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# iptables_policy_set (ipv6|ipv4) (ACCEPT|DROP)
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# Sets all policy rules to either ACCEPT or DROP for ipv4 or ipv6
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# If no policy given, assume ACCEPT
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function iptables_policy_reset {
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IP_VERSION=$1
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SET_POLICY=${2=ACCEPT}
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case $IP_VERSION in
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ipv6) VER_IPTABLES=${IP6TABLES} ;;
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ipv4|*) VER_IPTABLES=${IPTABLES} ;;
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esac
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${display_c} RED "Setting ${IP_VERSION} policies to ${SET_POLICY}..."
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${VER_IPTABLES} --policy INPUT ${SET_POLICY}
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${VER_IPTABLES} --policy OUTPUT ${SET_POLICY}
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${VER_IPTABLES} --policy FORWARD ${SET_POLICY}
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}
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# setup_iptables_chains (ipv4|ipv6)
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# Creates the default chains when called
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function setup_iptables_chains {
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IP_VERSION=$1
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case $IP_VERSION in
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ipv6) VER_IPTABLES=${IP6TABLES};
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IPVER="6" ;;
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ipv4|*) VER_IPTABLES=${IPTABLES}
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IPVER="4" ;;
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esac
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# Create the actual chains
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${display} GREEN "Setting up chains for ${IP_VERSION}..."
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${VER_IPTABLES} -N ${InPreRules}
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${VER_IPTABLES} -N ${OutPreRules}
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${VER_IPTABLES} -N ${InEasyBlock}
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${VER_IPTABLES} -N ${OutEasyBlock}
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${VER_IPTABLES} -N ${InFilter}
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${VER_IPTABLES} -N ${OutFilter}
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${VER_IPTABLES} -N ${FwdFilter}
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${VER_IPTABLES} -N ${NAT} -t nat
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${VER_IPTABLES} -N ${PortForward} -t nat
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${VER_IPTABLES} -N ${InPostRules}
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${VER_IPTABLES} -N ${OutPostRules}
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# Set up rules - the order matters - we do it separately here
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# for easy viewing of order
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if [ -x ${FWCONFIGDIR}/ipv${IPVER}/custom/prerun.sh ]; then . ${FWCONFIGDIR}/ipv${IPVER}/custom/prerun.sh; fi
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${debug} ${DebugColor} "${FUNCNAME}: Setting up InPreRules"
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${VER_IPTABLES} -A INPUT -j ${InPreRules}
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${debug} ${DebugColor} "${FUNCNAME}: Setting up OutPreRules"
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${VER_IPTABLES} -A OUTPUT -j ${OutPreRules}
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if [ -x ${FWCONFIGDIR}/ipv${IPVER}/custom/easyblock.sh ]; then . ${FWCONFIGDIR}/ipv${IPVER}/custom/easyblock.sh; fi
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${debug} ${DebugColor} "${FUNCNAME}: Setting up InEasyBlock"
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${VER_IPTABLES} -A INPUT -j ${InEasyBlock}
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${debug} ${DebugColor} "${FUNCNAME}: Setting up OutEasyBlock"
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${VER_IPTABLES} -A OUTPUT -j ${OutEasyBlock}
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if [ -x ${FWCONFIGDIR}/ipv${IPVER}/custom/filter.sh ]; then . ${FWCONFIGDIR}/ipv${IPVER}/custom/filter.sh; fi
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${debug} ${DebugColor} "${FUNCNAME}: Setting up InFilter"
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${VER_IPTABLES} -A INPUT -j ${InFilter}
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${debug} ${DebugColor} "${FUNCNAME}: Setting up OutFilter"
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${VER_IPTABLES} -A OUTPUT -j ${OutFilter}
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${debug} ${DebugColor} "${FUNCNAME}: Setting up FwdFilter"
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${VER_IPTABLES} -A FORWARD -j ${FwdFilter}
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if [ -x ${FWCONFIGDIR}/ipv${IPVER}/custom/nat.sh ]; then . ${FWCONFIGDIR}/ipv${IPVER}/custom/nat.sh; fi
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${debug} ${DebugColor} "${FUNCNAME}: Setting up NAT"
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${VER_IPTABLES} -A POSTROUTING -t nat -j ${NAT}
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if [ -x ${FWCONFIGDIR}/ipv${IPVER}/custom/portfw.sh ]; then . ${FWCONFIGDIR}/ipv${IPVER}/custom/portfw.sh; fi
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${debug} ${DebugColor} "${FUNCNAME}: Setting up PortForward"
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${VER_IPTABLES} -A PREROUTING -t nat -j ${PortForward}
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if [ -x ${FWCONFIGDIR}/ipv${IPVER}/custom/postrun.sh ]; then . ${FWCONFIGDIR}/ipv${IPVER}/custom/postrun.sh; fi
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${debug} ${DebugColor} "${FUNCNAME}: Setting up InPostRules"
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${VER_IPTABLES} -A INPUT -j ${InPostRules}
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${debug} ${DebugColor} "${FUNCNAME}: Setting up OutPostRules"
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${VER_IPTABLES} -A OUTPUT -j ${OutPostRules}
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}
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function allow_all_loopback {
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IP_VERSION=$1
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case $IP_VERSION in
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ipv6) VER_IPTABLES=${IP6TABLES};
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IPVER="6" ;;
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ipv4|*) VER_IPTABLES=${IPTABLES}
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IPVER="4" ;;
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esac
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${debug} ${DebugColor} "allow_all_loopback: loaded"
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${VER_IPTABLES} -A ${InPreRules} -i lo -j ACCEPT
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${VER_IPTABLES} -A ${OutPreRules} -o lo -j ACCEPT
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}
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function allow_trusted_hosts {
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IP_VERSION=$1
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case $IP_VERSION in
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ipv6) VER_IPTABLES=${IP6TABLES};
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IPVER="6" ;;
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ipv4|*) VER_IPTABLES=${IPTABLES}
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IPVER="4" ;;
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esac
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${debug} ${DebugColor} "${FUNCNAME}: loading"
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if [ -e "${FWCONFIGDIR}/ipv${IPVER}/trusted.conf" ]; then
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for i in `grep -v "\#" "${FWCONFIGDIR}/ipv${IPVER}/trusted.conf"`; do
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${VER_IPTABLES} -A ${InPreRules} -s $i -j ACCEPT
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${VER_IPTABLES} -A ${OutPreRules} -d $i -j ACCEPT
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done
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${debug} ${DebugColor} "${FUNCNAME}: done"
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else
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${display} RED "File Missing: ${FWCONFIGDIR}/ipv${IPVER}/trusted.conf"
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${display} RED "Error: can not load trusted hosts file."
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${debug} ${DebugColor} "${FUNCNAME}: failed"
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fi
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}
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function enable_mss_clamp {
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IP_VERSION=$1
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case $IP_VERSION in
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ipv6) VER_IPTABLES=${IP6TABLES};
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IPVER="6" ;;
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ipv4|*) VER_IPTABLES=${IPTABLES}
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IPVER="4" ;;
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esac
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${debug} ${DebugColor} "${FUNCNAME}: loading"
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if [ -e "${FWCONFIGDIR}/ipv${IPVER}/mss-clamp.conf" ]; then
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${debug} ${DebugColor} "${FUNCNAME}: read ${FWCONFIGDIR}/ipv${IPVER}/mss-clamp.conf successful"
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while read -r interface mss type; do
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[[ ${interface} = \#* ]] && continue
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[[ ${interface} = "" ]] && continue
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[[ ${mss} == "-" ]] && mss="1400:1536"
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[[ ${type} == "-" ]] && type="${OutFilter}"
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[[ ${type} == "out" ]] && type="${OutFilter}"
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[[ ${type} == "fwd" ]] && type="${FwdFilter}"
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${debug} ${DebugColor} "${FUNCNAME}: Read: ${interface} ${mss} ${type}"
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${VER_IPTABLES} -A ${type} -p tcp --tcp-flags SYN,RST SYN -j TCPMSS \
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--clamp-mss-to-pmtu -o ${interface} -m tcpmss --mss ${mss}
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done < "${FWCONFIGDIR}/ipv${IPVER}/mss-clamp.conf"
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${debug} ${DebugColor} "${FUNCNAME}: done"
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else
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${display} RED "File Missing: ${FWCONFIGDIR}/ipv${IPVER}/mss-clamp.conf"
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${display} RED "Error: can not load mss clamp file."
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${debug} ${DebugColor} "${FUNCNAME}: failed"
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fi
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}
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function allow_resolvconf_servers {
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IP_VERSION=$1
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case $IP_VERSION in
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ipv6) VER_IPTABLES=${IP6TABLES};
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IPVER="6" ;;
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ipv4|*) VER_IPTABLES=${IPTABLES}
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IPVER="4" ;;
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esac
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${debug} ${DebugColor} "${FUNCNAME}: loading"
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[[ ${IP_VERSION} = "ipv4" ]] && ResolvConfFile="${ResolvConfv4File}"
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[[ ${IP_VERSION} = "ipv6" ]] && ResolvConfFile="${ResolvConfv6File}"
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${debug} ${DebugColor} "${FUNCNAME}: Using ${ResolvConfFile} as resolv.conf"
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while read -r type server; do
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[[ ${type} != "nameserver" ]] && continue
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[[ ${type} = "" ]] && continue
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# If we see a : in the server variable, we are most likely dealing with an ipv6 address
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([[ ${server} =~ ":" ]] && [[ ${IP_VERSION} = "ipv4" ]]) && continue
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([[ ! ${server} =~ ":" ]] && [[ ${IP_VERSION} = "ipv6" ]]) && continue
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${debug} ${DebugColor} "${FUNCNAME}: Added ${server} to DNS client trusted list"
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${VER_IPTABLES} -A ${OutPreRules} -p udp -s ${server} --sport 1024:65535 --dport 53 -j ACCEPT
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${VER_IPTABLES} -A ${InPreRules} -p udp -d ${server} --dport 1024:65535 --sport 53 -j ACCEPT
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${VER_IPTABLES} -A ${OutPreRules} -p tcp -s ${server} --sport 1024:65535 --dport 53 -j ACCEPT
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${VER_IPTABLES} -A ${InPreRules} -p tcp -d ${server} --dport 1024:65535 --sport 53 -j ACCEPT
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done < "${ResolvConfFile}"
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${debug} ${DebugColor} "${FUNCNAME}: done"
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}
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function allow_dnsclient_manual {
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IP_VERSION=$1
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case $IP_VERSION in
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ipv6) VER_IPTABLES=${IP6TABLES};
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IPVER="6" ;;
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ipv4|*) VER_IPTABLES=${IPTABLES}
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IPVER="4" ;;
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esac
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DNS_SERVERS="$2"
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${debug} ${DebugColor} "${FUNCNAME}: loading"
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for i in ${DNS_SERVERS}; do
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${debug} ${DebugColor} "${FUNCNAME}: Added ${i} to DNS client trusted list"
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${VER_IPTABLES} -A ${OutPreRules} -p udp -s ${i} --sport 1024:65535 --dport 53 -j ACCEPT
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${VER_IPTABLES} -A ${InPreRules} -p udp -d ${i} --dport 1024:65535 --sport 53 -j ACCEPT
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${VER_IPTABLES} -A ${OutPreRules} -p tcp -s ${i} --sport 1024:65535 --dport 53 -j ACCEPT
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${VER_IPTABLES} -A ${InPreRules} -p tcp -d ${i} --dport 1024:65535 --sport 53 -j ACCEPT
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done
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${debug} ${DebugColor} "${FUNCNAME}: done"
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}
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function enable_easyblock {
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IP_VERSION=$1
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case $IP_VERSION in
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ipv6) VER_IPTABLES=${IP6TABLES};
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IPVER="6" ;;
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ipv4|*) VER_IPTABLES=${IPTABLES}
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IPVER="4" ;;
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esac
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${debug} ${DebugColor} "${FUNCNAME}: loading"
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if [ -e "${FWCONFIGDIR}/ipv${IPVER}/easyblock.conf" ]; then
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${debug} ${DebugColor} "${FUNCNAME}: read ${FWCONFIGDIR}/ipv${IPVER}/easyblock.conf successful"
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while read -r direction interface address port protocol; do
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[[ ${direction} = \#* ]] && continue
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[[ ${direction} = "" ]] && continue
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# Do some creative work with variables to make building the iptables rules fairly painless
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[[ ${port} != "-" ]] && port="--dport ${port}"
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([[ ${address} != "-" ]] && [[ ${direction} == "IN" ]]) && address="-s ${address}"
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([[ ${address} != "-" ]] && [[ ${direction} == "OUT" ]]) && address="-d ${address}"
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([[ ${interface} != "-" ]] && [[ ${direction} == "IN" ]]) && interface="-i ${interface}"
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([[ ${interface} != "-" ]] && [[ ${direction} == "OUT" ]]) && interface="-o ${interface}"
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[[ ${direction} == "OUT" ]] && chain="${OutEasyBlock}"
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[[ ${direction} == "IN" ]] && chain="${InEasyBlock}"
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[[ ${protocol} != "-" ]] && protocol="-p ${protocol}"
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${debug} ${DebugColor} "${FUNCNAME}: Read: ${direction} ${interface} ${address} ${port} ${protocol}"
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# Blank variables that we're not going to use.
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[[ ${interface} == "-" ]] && interface=""
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[[ ${port} == "-" ]] && port=""
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[[ ${address} == "-" ]] && address=""
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[[ ${protocol} == "-" ]] && protocol=""
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${VER_IPTABLES} -A ${chain} ${interface} ${address} ${protocol} ${port}
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done < "${FWCONFIGDIR}/ipv${IPVER}/easyblock.conf"
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${debug} ${DebugColor} "${FUNCNAME}: done"
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fi
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} |