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Add syn support to forward.conf config

master
bbruns 2014-04-12 18:37:41 +00:00
parent 9a1f7d3322
commit 4e3cbeced3
3 changed files with 15 additions and 10 deletions
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5
etc/ipv4/forward.conf
View File

@ -2,17 +2,18 @@
# Use this file to set up network address translation rules
# Use tabs or single space to separate
#
# <action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional>
# <action> <src-interface> <src-address> <dst-interface> <dst-address> <syn> <bidirectional>
#
# Action: Required ( ACCEPT | DROP )
# Source Interface: Optional ( interface name, aka eth0 )
# Source Address: Optional ( IP address with optional netmask )
# Destination Interface: Optional ( interface name, aka eth0 )
# Destination Address: Optional ( IP address with optional netmask )
# Syn: Optional, only match (not) syn packets (syn | notsyn )
# Bidirectional: Optional ( yes | no, defaults to no if '-' )
# You can use '-' for optional fields
#============================================================
#<action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional>
#<action> <src-interface> <src-address> <dst-interface> <dst-address> <syn> <bidirectional>
#ACCEPT eth0 - eth1 - yes
#DROP eth1 192.168.2.0/24 eth0 0/0 no

5
etc/ipv6/forward.conf
View File

@ -2,17 +2,18 @@
# Use this file to set up network address translation rules
# Use tabs or single space to separate
#
# <action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional>
# <action> <src-interface> <src-address> <dst-interface> <dst-address> <syn> <bidirectional>
#
# Action: Required ( ACCEPT | DROP )
# Source Interface: Optional ( interface name, aka eth0 )
# Source Address: Optional ( IP address with optional netmask )
# Destination Interface: Optional ( interface name, aka eth0 )
# Destination Address: Optional ( IP address with optional netmask )
# Syn: Optional, only match (not) syn packets (syn | notsyn )
# Bidirectional: Optional ( yes | no, defaults to no if '-' )
# You can use '-' for optional fields
#============================================================
#<action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional>
#<action> <src-interface> <src-address> <dst-interface> <dst-address> <syn> <bidirectional>
#ACCEPT eth0 - eth1 - yes
#DROP eth1 2002::/64 eth0 2001::/3 no

15
lib/iptables.inc
View File

@ -328,7 +328,7 @@ function enable_filtering {
[[ ${syn} == "syn" ]] && syn="--syn"
[[ ${syn} == "notsyn" ]] && syn="! --syn"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR}${direction} ${action} ${interface} ${srcaddress} ${srcport} ${dstaddress} ${dstport} ${protocol}"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR}${direction} ${action} ${interface} ${srcaddress} ${srcport} ${dstaddress} ${dstport} ${protocol} ${syn}"
# Blank variables that we're not going to use.
[[ ${interface} == "-" ]] && interface=""
@ -359,11 +359,11 @@ function enable_forwarding {
use_conntrack="no"
([[ ${IP_VERSION} == "ipv4" ]] && [[ ${Enablev4ConnectionTracking} == "yes" ]]) && conntrack_state="${M_STATE} ${C_STATE} ESTABLISHED,RELATED"
([[ ${IP_VERSION} == "ipv6" ]] && [[ ${Enablev6ConnectionTracking} == "yes" ]]) && conntrack_state="${M_STATE} ${C_STATE} ESTABLISHED,RELATED"
while read -r action srcinterface srcaddress dstinterface dstaddress bidirectional; do
while read -r action srcinterface srcaddress dstinterface dstaddress syn bidirectional; do
[[ ${action} = \#* ]] && continue
[[ ${action} = "" ]] && continue
([[ ${action} != "ACCEPT" ]] && [[ ${action} != "DROP" ]]) \
&& ${display} RED "acl.conf: Error - action must be either ACCEPT or DROP : ${DEFAULT_COLOR}${action} ${srcinterface} ${srcaddress} ${dstinterface} ${srcaddress}" && continue
&& ${display} RED "forward.conf: Error - action must be either ACCEPT or DROP : ${DEFAULT_COLOR}${action} ${srcinterface} ${srcaddress} ${dstinterface} ${dstaddress} ${syn} ${bidirectional}" && continue
# Do some creative work with variables to make building the iptables rules fairly painless
([[ ${bidirectional} == "yes" ]] && [[ ${srcaddress} != "-" ]]) && revsrcaddress="-d ${srcaddress}"
@ -374,8 +374,10 @@ function enable_forwarding {
[[ ${dstaddress} != "-" ]] && dstaddress="-d ${dstaddress}"
[[ ${srcinterface} != "-" ]] && srcinterface="-i ${srcinterface}"
[[ ${dstinterface} != "-" ]] && dstinterface="-o ${dstinterface}"
[[ ${syn} == "syn" ]] && syn="--syn"
[[ ${syn} == "notsyn" ]] && syn="! --syn"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR}${action} ${srcinterface} ${srcaddress} ${dstinterface} ${srcaddress}"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR}${action} ${srcinterface} ${srcaddress} ${dstinterface} ${dstaddress} ${syn} ${bidirectional}"
# Blank variables that we're not going to use.
[[ ${srcinterface} == "-" ]] && srcinterface=""
@ -385,9 +387,10 @@ function enable_forwarding {
[[ ${bidirectional} == "-" ]] && bidirectional="no"
[[ ${action} == "DROP" ]] && conntrack_state=""
[[ ${syn} == "-" ]] && syn=""
${VER_IPTABLES} -A ${FwdFilter} ${srcinterface} ${srcaddress} ${dstinterface} ${dstaddress} ${conntrack_state} -j ${action}
[[ ${bidirectional} == "yes" ]] && ${VER_IPTABLES} -A ${FwdFilter} ${revsrcinterface} ${revsrcaddress} ${revdstinterface} ${revdstaddress} ${conntrack_state} -j ${action}
${VER_IPTABLES} -A ${FwdFilter} ${srcinterface} ${srcaddress} ${syn} ${dstinterface} ${dstaddress} ${conntrack_state} -j ${action}
[[ ${bidirectional} == "yes" ]] && ${VER_IPTABLES} -A ${FwdFilter} ${revsrcinterface} ${revsrcaddress} ${syn} ${revdstinterface} ${revdstaddress} ${conntrack_state} -j ${action}
done < "${FWCONFIGDIR}/ipv${IPVER}/forward.conf"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} done"
fi