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SRFirewall
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Give users more knobs to twist

master
bbruns 2014-04-12 23:05:33 +00:00
parent 8f13bf44f4
commit 2db64ac6ad
7 changed files with 35 additions and 19 deletions
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5
CHANGELOG
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@ -1,5 +1,8 @@
2.00 Alpha 3 - 2.00 Alpha 3 -
- (Hopefully) Resolved UDP reply issue with conntracking and default DROP - Give people knobs to tinker with regarding state matching. Kills
multiple birds with one stone.
- forward.conf
2.00 Alpha 2 - 04/12/2014 2.00 Alpha 2 - 04/12/2014

2
bin/srfirewall
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@ -19,7 +19,7 @@
# along with this program. If not, see <http://www.gnu.org/licenses/>. # along with this program. If not, see <http://www.gnu.org/licenses/>.
# Static config options, normally do not need to change # Static config options, normally do not need to change
FW_VERSION="2.0 Alpha 2" FW_VERSION="2.0 Alpha 3"
# Important directory locations # Important directory locations
FWPREFIX="/usr/local" FWPREFIX="/usr/local"

6
etc/ipv4/acl.conf
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@ -2,7 +2,7 @@
# Use this file to set up more complex access control lists. # Use this file to set up more complex access control lists.
# Use tabs or single space to separate # Use tabs or single space to separate
# #
# <direction> <action> <interface> <src-address> <src-port> <dst-address> <dst-port> <protocol> <syn> # <direction> <action> <interface> <src-address> <src-port> <dst-address> <dst-port> <protocol> <syn> <state>
# #
# Direction: Required ( IN | OUT ) # Direction: Required ( IN | OUT )
# Action: Required (ACCEPT | DROP) # Action: Required (ACCEPT | DROP)
@ -13,9 +13,11 @@
# Dst Port: Optional ( destination port, 1 - 65535, Requires Protocol ) # Dst Port: Optional ( destination port, 1 - 65535, Requires Protocol )
# Protocol: Optional, Required if port is specified ( tcp | udp ) # Protocol: Optional, Required if port is specified ( tcp | udp )
# Syn: Optional, only match (not) syn packets (syn | notsyn ) # Syn: Optional, only match (not) syn packets (syn | notsyn )
# State: Optional, set the connection tracking states ( comma separated list )
# You can use '-' for optional fields # You can use '-' for optional fields
#============================================================ #============================================================
#<dir> <action> <interface> <src-address> <src-port> <dst-address> <dst-port> <protocol> <syn> #<dir> <action> <interface> <src-address> <src-port> <dst-address> <dst-port> <protocol> <syn> <state>
#IN ACCEPT eth0 10.0.0.1 22 - - tcp - #IN ACCEPT eth0 10.0.0.1 22 - - tcp -
#IN DROP - - - - 22 tcp syn #IN DROP - - - - 22 tcp syn

8
etc/ipv4/forward.conf
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@ -2,7 +2,7 @@
# Use this file to set up network address translation rules # Use this file to set up network address translation rules
# Use tabs or single space to separate # Use tabs or single space to separate
# #
# <action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional> <src-port> <dst-port> <protocol> <syn> # <action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional> <src-port> <dst-port> <protocol> <syn> <state>
# #
# Action: Required ( ACCEPT | DROP ) # Action: Required ( ACCEPT | DROP )
# Source Interface: Optional ( interface name, aka eth0 ) # Source Interface: Optional ( interface name, aka eth0 )
@ -16,12 +16,14 @@
# Destination Port: Optional ( destination port number, or range 1:65535 ) # Destination Port: Optional ( destination port number, or range 1:65535 )
# Protocol: Optional, required if port numbers specified ( tcp | udp ) # Protocol: Optional, required if port numbers specified ( tcp | udp )
# Syn: Optional, only match (not) syn packets (syn | notsyn ) # Syn: Optional, only match (not) syn packets (syn | notsyn )
# State: Optional, set the connection tracking states ( comma separated list )
# #
# You can use '-' for optional fields # You can use '-' for optional fields
#============================================================ #============================================================
#<action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional> <src-port> <dst-port> <protocol> <syn> #<action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional> <src-port> <dst-port> <protocol> <syn> <state>
#ACCEPT eth0 - eth1 - yes #ACCEPT eth0 - eth1 - yes
#DROP eth1 192.168.2.0/24 eth0 0/0 no #DROP eth1 192.168.2.0/24 eth0 0/0 no
#DROP eth0 - eth1 192.168.0.0/24 no - 1:1024 tcp syn #DROP eth0 - eth1 192.168.0.0/24 no - 1:1024 tcp syn NEW
#ACCEPT eth1 - eth0 - no - - udp - NEW,ESTABLISHED,RELATED

6
etc/ipv6/acl.conf
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@ -2,7 +2,7 @@
# Use this file to set up more complex access control lists. # Use this file to set up more complex access control lists.
# Use tabs or single space to separate # Use tabs or single space to separate
# #
# <direction> <action> <interface> <src-address> <src-port> <dst-address> <dst-port> <protocol> <syn> # <direction> <action> <interface> <src-address> <src-port> <dst-address> <dst-port> <protocol> <syn> <state>
# #
# Direction: Required ( IN | OUT ) # Direction: Required ( IN | OUT )
# Action: Required (ACCEPT | DROP) # Action: Required (ACCEPT | DROP)
@ -13,9 +13,11 @@
# Dst Port: Optional ( destination port, 1 - 65535, Requires Protocol ) # Dst Port: Optional ( destination port, 1 - 65535, Requires Protocol )
# Protocol: Optional, Required if port is specified ( tcp | udp ) # Protocol: Optional, Required if port is specified ( tcp | udp )
# Syn: Optional, only match (not) syn packets (syn | notsyn ) # Syn: Optional, only match (not) syn packets (syn | notsyn )
# State: Optional, set the connection tracking states ( comma separated list )
#
# You can use '-' for optional fields # You can use '-' for optional fields
#============================================================ #============================================================
#<dir> <action> <interface> <src-address> <src-port> <dst-address> <dst-port> <protocol> <syn> #<dir> <action> <interface> <src-address> <src-port> <dst-address> <dst-port> <protocol> <syn> <state>
#IN ACCEPT eth0 2002:dead:beef::/64 22 - - tcp - #IN ACCEPT eth0 2002:dead:beef::/64 22 - - tcp -
#IN DROP - - - - 22 tcp syn #IN DROP - - - - 22 tcp syn

6
etc/ipv6/forward.conf
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@ -2,7 +2,7 @@
# Use this file to set up network address translation rules # Use this file to set up network address translation rules
# Use tabs or single space to separate # Use tabs or single space to separate
# #
# <action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional> <src-port> <dst-port> <protocol> <syn> # <action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional> <src-port> <dst-port> <protocol> <syn> <state>
# #
# Action: Required ( ACCEPT | DROP ) # Action: Required ( ACCEPT | DROP )
# Source Interface: Optional ( interface name, aka eth0 ) # Source Interface: Optional ( interface name, aka eth0 )
@ -16,10 +16,12 @@
# Destination Port: Optional ( destination port number, or range 1:65535 ) # Destination Port: Optional ( destination port number, or range 1:65535 )
# Protocol: Optional, required if port numbers specified ( tcp | udp ) # Protocol: Optional, required if port numbers specified ( tcp | udp )
# Syn: Optional, only match (not) syn packets (syn | notsyn ) # Syn: Optional, only match (not) syn packets (syn | notsyn )
# State: Optional, set the connection tracking states ( comma separated list )
# #
# You can use '-' for optional fields # You can use '-' for optional fields
#============================================================ #============================================================
#<action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional> <src-port> <dst-port> <protocol> <syn> #<action> <src-interface> <src-address> <dst-interface> <dst-address> <bidirectional> <src-port> <dst-port> <protocol> <syn> <state>
#ACCEPT eth0 - eth1 - yes #ACCEPT eth0 - eth1 - yes
#DROP eth1 2002::/64 eth0 2001::/3 no #DROP eth1 2002::/64 eth0 2001::/3 no
#DROP eth0 2001::/3 eth1 2002:dead:beef::/64 no - 1:1024 tcp syn #DROP eth0 2001::/3 eth1 2002:dead:beef::/64 no - 1:1024 tcp syn
#ACCEPT eth1 - eth0 - no - - udp - NEW,ESTABLISHED,RELATED

19
lib/iptables.inc
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@ -360,14 +360,12 @@ function enable_forwarding {
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} loading" ${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} loading"
if [ -e "${FWCONFIGDIR}/ipv${IPVER}/forward.conf" ]; then if [ -e "${FWCONFIGDIR}/ipv${IPVER}/forward.conf" ]; then
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} read ${FWCONFIGDIR}/ipv${IPVER}/forward.conf successful" ${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} read ${FWCONFIGDIR}/ipv${IPVER}/forward.conf successful"
while read -r action srcinterface srcaddress dstinterface dstaddress bidirectional srcport dstport protocol syn; do while read -r action srcinterface srcaddress dstinterface dstaddress bidirectional srcport dstport protocol syn state; do
unset conntrack_state conntrack_udp_new revsrcaddress revdstaddress revdstinterface revsrcinterface revsrcport revdstport unset conntrack_state conntrack_udp_new revsrcaddress revdstaddress revdstinterface revsrcinterface revsrcport revdstport
([[ ${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"
[[ ${action} = \#* ]] && continue [[ ${action} = \#* ]] && continue
[[ -z ${action} ]] && continue [[ -z ${action} ]] && continue
([[ ${action} != "ACCEPT" ]] && [[ ${action} != "DROP" ]]) \ ([[ ${action} != "ACCEPT" ]] && [[ ${action} != "DROP" ]]) \
&& ${display} RED "forward.conf: Error - action must be either ACCEPT or DROP : ${DEFAULT_COLOR}${action} ${srcinterface} ${srcaddress} ${dstinterface} ${dstaddress} ${bidirectional} ${srcport} ${dstport} ${protocol} ${syn}" && continue && ${display} RED "forward.conf: Error - action must be either ACCEPT or DROP : ${DEFAULT_COLOR}${action} ${srcinterface} ${srcaddress} ${dstinterface} ${dstaddress} ${bidirectional} ${srcport} ${dstport} ${protocol} ${syn} ${state}" && continue
# Do some creative work with variables to make building the iptables rules fairly painless # Do some creative work with variables to make building the iptables rules fairly painless
@ -378,6 +376,12 @@ function enable_forwarding {
[[ -z ${srcport} ]] && srcport="-" [[ -z ${srcport} ]] && srcport="-"
[[ -z ${protocol} ]] && protocol="-" [[ -z ${protocol} ]] && protocol="-"
[[ -z ${syn} ]] && syn="-" [[ -z ${syn} ]] && syn="-"
[[ -z ${state} ]] && state="-"
([[ ${IP_VERSION} == "ipv4" ]] && [[ ${Enablev4ConnectionTracking} == "yes" ]] && [[ ${state} == "-" ]]) && conntrack_state="${M_STATE} ${C_STATE} ESTABLISHED,RELATED"
([[ ${IP_VERSION} == "ipv6" ]] && [[ ${Enablev6ConnectionTracking} == "yes" ]] && [[ ${state} == "-" ]]) && conntrack_state="${M_STATE} ${C_STATE} ESTABLISHED,RELATED"
([[ ${IP_VERSION} == "ipv4" ]] && [[ ${Enablev4ConnectionTracking} == "yes" ]] && [[ ! ${state} == "-" ]]) && conntrack_state="${M_STATE} ${C_STATE} ${state}"
([[ ${IP_VERSION} == "ipv6" ]] && [[ ${Enablev6ConnectionTracking} == "yes" ]] && [[ ! ${state} == "-" ]]) && conntrack_state="${M_STATE} ${C_STATE} ${state}"
([[ ${bidirectional} == "yes" ]] && [[ ${srcaddress} != "-" ]]) && revsrcaddress="-d ${srcaddress}" ([[ ${bidirectional} == "yes" ]] && [[ ${srcaddress} != "-" ]]) && revsrcaddress="-d ${srcaddress}"
([[ ${bidirectional} == "yes" ]] && [[ ${dstaddress} != "-" ]]) && revdstaddress="-s ${dstaddress}" ([[ ${bidirectional} == "yes" ]] && [[ ${dstaddress} != "-" ]]) && revdstaddress="-s ${dstaddress}"
@ -397,7 +401,7 @@ function enable_forwarding {
([[ ${bidirectional} == "yes" ]] && [[ ${dstport} != "-" ]]) && revdstport="--sport ${dstport}" ([[ ${bidirectional} == "yes" ]] && [[ ${dstport} != "-" ]]) && revdstport="--sport ${dstport}"
[[ ${protocol} != "-" ]] && protocol="-p ${protocol}" [[ ${protocol} != "-" ]] && protocol="-p ${protocol}"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR}${action} ${srcinterface} ${srcaddress} ${dstinterface} ${dstaddress} ${bidirectional} ${srcport} ${dstport} ${protocol} ${syn}" ${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR}${action} ${srcinterface} ${srcaddress} ${dstinterface} ${dstaddress} ${bidirectional} ${srcport} ${dstport} ${protocol} ${syn} ${state}"
# Blank variables that we're not going to use. # Blank variables that we're not going to use.
[[ ${srcinterface} == "-" ]] && srcinterface="" [[ ${srcinterface} == "-" ]] && srcinterface=""
@ -407,14 +411,15 @@ function enable_forwarding {
[[ ${dstport} == "-" ]] && dstport="" [[ ${dstport} == "-" ]] && dstport=""
[[ ${srcport} == "-" ]] && srcport="" [[ ${srcport} == "-" ]] && srcport=""
[[ ${syn} == "-" ]] && syn="" [[ ${syn} == "-" ]] && syn=""
[[ ${state} == "-" ]] && state=""
[[ ${protocol} == "-" ]] && protocol="" [[ ${protocol} == "-" ]] && protocol=""
[[ ${bidirectional} == "-" ]] && bidirectional="no" [[ ${bidirectional} == "-" ]] && bidirectional="no"
[[ ${action} == "DROP" ]] && conntrack_state="" [[ ${action} == "DROP" ]] && conntrack_state=""
${VER_IPTABLES} -A ${FwdFilter} ${protocol} ${srcinterface} ${srcaddress} ${srcport} ${syn} ${dstinterface} ${dstaddress} ${dstport} ${conntrack_state}${conntrack_udp_new} -j ${action} ${VER_IPTABLES} -A ${FwdFilter} ${protocol} ${srcinterface} ${srcaddress} ${srcport} ${syn} ${dstinterface} ${dstaddress} ${dstport} ${conntrack_state} -j ${action}
[[ ${bidirectional} == "yes" ]] && ${VER_IPTABLES} -A ${FwdFilter} ${protocol} ${revsrcinterface} ${revsrcaddress} ${revsrcport} ${syn} ${revdstinterface} ${revdstaddress} ${revdstport} ${conntrack_state}${conntrack_udp_new} -j ${action} [[ ${bidirectional} == "yes" ]] && ${VER_IPTABLES} -A ${FwdFilter} ${protocol} ${revsrcinterface} ${revsrcaddress} ${revsrcport} ${syn} ${revdstinterface} ${revdstaddress} ${revdstport} ${conntrack_state} -j ${action}
done < "${FWCONFIGDIR}/ipv${IPVER}/forward.conf" done < "${FWCONFIGDIR}/ipv${IPVER}/forward.conf"
${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} done" ${debug} ${DebugColor} "${FUNCNAME}:${DEFAULT_COLOR} done"
fi fi