Expand forward filtering to work with ports/protocols
bbruns
parent
4e3cbeced3
commit
f196177c1e
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@ -2,18 +2,26 @@
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# Use this file to set up network address translation rules
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# Use tabs or single space to separate
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#
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# <action> <src-interface> <src-address> <dst-interface> <dst-address> <syn> <bidirectional>
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# <action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional> <src-port> <dst-port> <protocol> <syn>
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#
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# Action: Required ( ACCEPT | DROP )
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# Source Interface: Optional ( interface name, aka eth0 )
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# Source Address: Optional ( IP address with optional netmask )
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# Destination Interface: Optional ( interface name, aka eth0 )
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# Destination Address: Optional ( IP address with optional netmask )
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# Syn: Optional, only match (not) syn packets (syn | notsyn )
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# Bidirectional: Optional ( yes | no, defaults to no if '-' )
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#
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# The next set can be safely left off the end if not desired
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# Source Port: Optional ( source port number, or range 1:65535 )
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# Destination Port: Optional ( destination port number, or range 1:65535 )
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# Protocol: Optional, required if port numbers specified ( tcp | udp )
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# Syn: Optional, only match (not) syn packets (syn | notsyn )
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#
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# You can use '-' for optional fields
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#============================================================
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#<action> <src-interface> <src-address> <dst-interface> <dst-address> <syn> <bidirectional>
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#<action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional> <src-port> <dst-port> <protocol> <syn>
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#ACCEPT eth0 - eth1 - yes
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#DROP eth1 192.168.2.0/24 eth0 0/0 no
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#DROP eth0 - eth1 192.168.0.0/24 no - 1:1024 tcp syn
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@ -2,18 +2,24 @@
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# Use this file to set up network address translation rules
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# Use tabs or single space to separate
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#
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# <action> <src-interface> <src-address> <dst-interface> <dst-address> <syn> <bidirectional>
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# <action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional> <src-port> <dst-port> <protocol> <syn>
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#
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# Action: Required ( ACCEPT | DROP )
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# Source Interface: Optional ( interface name, aka eth0 )
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# Source Address: Optional ( IP address with optional netmask )
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# Destination Interface: Optional ( interface name, aka eth0 )
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# Destination Address: Optional ( IP address with optional netmask )
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# Syn: Optional, only match (not) syn packets (syn | notsyn )
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# Bidirectional: Optional ( yes | no, defaults to no if '-' )
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#
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# The next set can be safely left off the end if not desired
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# Source Port: Optional ( source port number, or range 1:65535 )
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# Destination Port: Optional ( destination port number, or range 1:65535 )
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# Protocol: Optional, required if port numbers specified ( tcp | udp )
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# Syn: Optional, only match (not) syn packets (syn | notsyn )
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#
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# You can use '-' for optional fields
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#============================================================
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#<action> <src-interface> <src-address> <dst-interface> <dst-address> <syn> <bidirectional>
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#<action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional> <src-port> <dst-port> <protocol> <syn>
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#ACCEPT eth0 - eth1 - yes
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#DROP eth1 2002::/64 eth0 2001::/3 no
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#DROP eth0 2001::/3 eth1 2002:dead:beef::/64 no - 1:1024 tcp syn
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@ -359,11 +359,11 @@ function enable_forwarding {
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use_conntrack="no"
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([[ ${IP_VERSION} == "ipv4" ]] && [[ ${Enablev4ConnectionTracking} == "yes" ]]) && conntrack_state="${M_STATE} ${C_STATE} ESTABLISHED,RELATED"
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([[ ${IP_VERSION} == "ipv6" ]] && [[ ${Enablev6ConnectionTracking} == "yes" ]]) && conntrack_state="${M_STATE} ${C_STATE} ESTABLISHED,RELATED"
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while read -r action srcinterface srcaddress dstinterface dstaddress syn bidirectional; do
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while read -r action srcinterface srcaddress dstinterface dstaddress bidirectional srcport dstport protocol syn; do
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[[ ${action} = \#* ]] && continue
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[[ ${action} = "" ]] && continue
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([[ ${action} != "ACCEPT" ]] && [[ ${action} != "DROP" ]]) \
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&& ${display} RED "forward.conf: Error - action must be either ACCEPT or DROP : ${DEFAULT_COLOR}${action} ${srcinterface} ${srcaddress} ${dstinterface} ${dstaddress} ${syn} ${bidirectional}" && continue
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&& ${display} RED "forward.conf: Error - action must be either ACCEPT or DROP : ${DEFAULT_COLOR}${action} ${srcinterface} ${srcaddress} ${dstinterface} ${dstaddress} ${bidirectional} ${src-port} ${dst-port} ${protocol} ${syn}" && continue
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# Do some creative work with variables to make building the iptables rules fairly painless
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([[ ${bidirectional} == "yes" ]] && [[ ${srcaddress} != "-" ]]) && revsrcaddress="-d ${srcaddress}"
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@ -376,21 +376,29 @@ function enable_forwarding {
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[[ ${dstinterface} != "-" ]] && dstinterface="-o ${dstinterface}"
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[[ ${syn} == "syn" ]] && syn="--syn"
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[[ ${syn} == "notsyn" ]] && syn="! --syn"
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[[ ${dstport} != "-" ]] && dstport="--dport ${dstport}"
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[[ ${srcport} != "-" ]] && srcport="--sport ${srcport}"
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([[ ${bidirectional} == "yes" ]] && [[ ${srcport} != "-" ]]) && revsrcport="--dport ${srcport}"
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([[ ${bidirectional} == "yes" ]] && [[ ${dstport} != "-" ]]) && revdstport="--sport ${dstport}"
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[[ ${protocol} != "-" ]] && protocol="-p ${protocol}"
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${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR}${action} ${srcinterface} ${srcaddress} ${dstinterface} ${dstaddress} ${syn} ${bidirectional}"
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${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR}${action} ${srcinterface} ${srcaddress} ${dstinterface} ${dstaddress} ${bidirectional} ${src-port} ${dst-port} ${protocol} ${syn}"
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# Blank variables that we're not going to use.
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[[ ${srcinterface} == "-" ]] && srcinterface=""
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[[ ${dstinterface} == "-" ]] && dstinterface=""
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[[ ${dstaddress} == "-" ]] && dstaddress=""
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[[ ${srcaddress} == "-" ]] && srcaddress=""
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[[ ${dstport} == "-" ]] && dstport=""
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[[ ${srcport} == "-" ]] && srcport=""
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[[ ${syn} == "-" ]] && syn=""
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[[ ${bidirectional} == "-" ]] && bidirectional="no"
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[[ ${action} == "DROP" ]] && conntrack_state=""
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[[ ${syn} == "-" ]] && syn=""
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${VER_IPTABLES} -A ${FwdFilter} ${srcinterface} ${srcaddress} ${syn} ${dstinterface} ${dstaddress} ${conntrack_state} -j ${action}
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[[ ${bidirectional} == "yes" ]] && ${VER_IPTABLES} -A ${FwdFilter} ${revsrcinterface} ${revsrcaddress} ${syn} ${revdstinterface} ${revdstaddress} ${conntrack_state} -j ${action}
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${VER_IPTABLES} -A ${FwdFilter} ${protocol} ${srcinterface} ${srcaddress} ${srcport} ${syn} ${dstinterface} ${dstaddress} ${dstport} ${conntrack_state} -j ${action}
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[[ ${bidirectional} == "yes" ]] && ${VER_IPTABLES} -A ${FwdFilter} ${protocol} ${revsrcinterface} ${revsrcaddress} ${revsrcport} ${syn} ${revdstinterface} ${revdstaddress} ${revdstport} ${conntrack_state} -j ${action}
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done < "${FWCONFIGDIR}/ipv${IPVER}/forward.conf"
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${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} done"
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fi
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