+++ /dev/null
-choice
- prompt "Choose firewall"
- default FIREWALL_OLD
- depends PACKAGE_firewall
-
-config FIREWALL_OLD
- bool "old firewall"
-
-config FIREWALL_NEW
- bool "new uci firewall"
- select PACKAGE_iptables-mod-conntrack
- select PACKAGE_iptables-mod-extra
- select PACKAGE_iptables-mod-ipopt
- select PACKAGE_iptables-mod-ulog
- select PACKAGE_kmod-ipt-nathelper
-
-endchoice
CATEGORY:=Base system
URL:=http://openwrt.org/
TITLE:=OpenWrt firewall
- DEPENDS:=+iptables
+ DEPENDS:=+iptables +iptables-mod-ipopt +iptables-mod-extra
endef
define Package/firewall/description
firewall for openwrt, you can select if you want to use the old version or the new uci based script
endef
-define Package/firewall/config
- source "$(SOURCE)/Config.in"
-endef
-
define Build/Compile
true
endef
-ifeq ($(CONFIG_FIREWALL_NEW),y)
define Package/firewall/conffiles
/etc/config/firewall
endef
define Package/firewall/install
$(INSTALL_DIR) $(1)/lib/firewall
- $(INSTALL_DATA) ./files/new/uci_firewall.sh $(1)/lib/firewall
+ $(INSTALL_DATA) ./files/uci_firewall.sh $(1)/lib/firewall
$(INSTALL_DIR) $(1)/etc/config
- $(INSTALL_DATA) ./files/new/firewall.config $(1)/etc/config/firewall
+ $(INSTALL_DATA) ./files/firewall.config $(1)/etc/config/firewall
$(INSTALL_DIR) $(1)/etc/init.d/
- $(INSTALL_BIN) ./files/new/firewall.init $(1)/etc/init.d/firewall
+ $(INSTALL_BIN) ./files/firewall.init $(1)/etc/init.d/firewall
$(INSTALL_DIR) $(1)/etc/hotplug.d/iface
- $(INSTALL_DATA) ./files/new/20-firewall $(1)/etc/hotplug.d/iface
+ $(INSTALL_DATA) ./files/20-firewall $(1)/etc/hotplug.d/iface
endef
-else
-
-define Package/firewall/conffiles
-/etc/firewall.config
-/etc/firewall.user
-endef
-
-define Package/firewall/install
- $(INSTALL_DIR) $(1)/etc/config
- $(INSTALL_DATA) ./files/old/firewall.config $(1)/etc/
- $(INSTALL_DIR) $(1)/etc/init.d
- $(INSTALL_BIN) ./files/old/firewall.init $(1)/etc/init.d/firewall
- $(INSTALL_BIN) ./files/old/firewall.user $(1)/etc/
- $(INSTALL_DIR) $(1)/usr/lib
- $(INSTALL_DATA) ./files/old/firewall.awk $(1)/usr/lib
-endef
-endif
$(eval $(call BuildPackage,firewall))
--- /dev/null
+. /lib/firewall/uci_firewall.sh
+unset ZONE
+config_get ifname $INTERFACE ifname
+INTERFACE=$ifname
+[ "$INTERFACE" == "lo" ] && exit 0
+load_zones() {
+ local name
+ local network
+ config_get name $1 name
+ config_get network $1 network
+ [ -z "$network" ] && network=$name
+ for n in $network; do
+ local ifname
+ config_get ifname $n ifname
+ list_contains ifname $INTERFACE && {
+ list_contains ZONE $name || ZONE="$ZONE $name"
+ }
+ done
+}
+
+config_foreach load_zones zone
+
+[ -z "$ZONE" ] && exit 0
+
+[ ifup = "$ACTION" ] && {
+ for z in $ZONE; do
+ local loaded
+ config_get loaded core loaded
+ [ -n "$loaded" ] && addif $INTERFACE $z
+ done
+}
+
+[ ifdown = "$ACTION" ] && {
+ for z in $ZONE; do
+ local up
+ config_get up $z up
+ [ "$up" == "1" ] && delif $INTERFACE $z
+ done
+}
--- /dev/null
+config defaults
+ option syn_flood 1
+ option input DROP
+ option output ACCEPT
+ option forward DROP
+
+config zone
+ option name lan
+ option input ACCEPT
+ option output ACCEPT
+ option forward DROP
+
+config zone
+ option name wan
+ option input DROP
+ option output ACCEPT
+ option forward DROP
+ option masq 1
+
+config forwarding
+ option src lan
+ option dest wan
+
+
+### EXAMPLE CONFIG SECTIONS
+# do not allow a specific ip to access wan
+#config rule
+# option src lan
+# option src_ip 192.168.45.2
+# option dest wan
+# option proto tcp
+# option target REJECT
+
+# block a specific mac on wan
+#config rule
+# option dest wan
+# option src_mac 00:11:22:33:44:66
+# option target REJECT
+
+# block incoming ICMP traffic on a zone
+#config rule
+# option src lan
+# option proto ICMP
+# option target DROP
+
+# port redirect port coming in on wan to lan
+#config redirect
+# option src wan
+# option src_dport 80
+# option dest lan
+# option dest_ip 192.168.16.235
+# option dest_port 80
+# option protocol tcp
+
+# include a file with users custom iptables rules
+#config include
+# option path /etc/firewall.user
+
+
+### FULL CONFIG SECTIONS
+#config rule
+# option src lan
+# option src_ip 192.168.45.2
+# option src_mac 00:11:22:33:44:55
+# option src_port 80
+# option dest wan
+# option dest_ip 194.25.2.129
+# option dest_port 120
+# option proto tcp
+# option target REJECT
+
+#config redirect
+# option src lan
+# option src_ip 192.168.45.2
+# option src_mac 00:11:22:33:44:55
+# option src_port 1024
+# option src_dport 80
+# option dest_ip 194.25.2.129
+# option dest_port 120
+# option proto tcp
--- /dev/null
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2008 OpenWrt.org
+
+START=45
+
+start() {
+ . /lib/firewall/uci_firewall.sh
+ fw_init
+}
+
+stop() {
+ . /lib/firewall/uci_firewall.sh
+ fw_stop
+}
+++ /dev/null
-. /lib/firewall/uci_firewall.sh
-unset ZONE
-config_get ifname $INTERFACE ifname
-INTERFACE=$ifname
-[ "$INTERFACE" == "lo" ] && exit 0
-load_zones() {
- local name
- local network
- config_get name $1 name
- config_get network $1 network
- [ -z "$network" ] && network=$name
- for n in $network; do
- local ifname
- config_get ifname $n ifname
- list_contains ifname $INTERFACE && {
- list_contains ZONE $name || ZONE="$ZONE $name"
- }
- done
-}
-
-config_foreach load_zones zone
-
-[ -z "$ZONE" ] && exit 0
-
-[ ifup = "$ACTION" ] && {
- for z in $ZONE; do
- local loaded
- config_get loaded core loaded
- [ -n "$loaded" ] && addif $INTERFACE $z
- done
-}
-
-[ ifdown = "$ACTION" ] && {
- for z in $ZONE; do
- local up
- config_get up $z up
- [ "$up" == "1" ] && delif $INTERFACE $z
- done
-}
+++ /dev/null
-config defaults
- option syn_flood 1
- option input DROP
- option output ACCEPT
- option forward DROP
-
-config zone
- option name lan
- option input ACCEPT
- option output ACCEPT
- option forward DROP
-
-config zone
- option name wan
- option input DROP
- option output ACCEPT
- option forward DROP
- option masq 1
-
-config forwarding
- option src lan
- option dest wan
-
-
-### EXAMPLE CONFIG SECTIONS
-# do not allow a specific ip to access wan
-#config rule
-# option src lan
-# option src_ip 192.168.45.2
-# option dest wan
-# option proto tcp
-# option target REJECT
-
-# block a specific mac on wan
-#config rule
-# option dest wan
-# option src_mac 00:11:22:33:44:66
-# option target REJECT
-
-# block incoming ICMP traffic on a zone
-#config rule
-# option src lan
-# option proto ICMP
-# option target DROP
-
-# port redirect port coming in on wan to lan
-#config redirect
-# option src wan
-# option src_dport 80
-# option dest lan
-# option dest_ip 192.168.16.235
-# option dest_port 80
-# option protocol tcp
-
-# include a file with users custom iptables rules
-#config include
-# option path /etc/firewall.user
-
-
-### FULL CONFIG SECTIONS
-#config rule
-# option src lan
-# option src_ip 192.168.45.2
-# option src_mac 00:11:22:33:44:55
-# option src_port 80
-# option dest wan
-# option dest_ip 194.25.2.129
-# option dest_port 120
-# option proto tcp
-# option target REJECT
-
-#config redirect
-# option src lan
-# option src_ip 192.168.45.2
-# option src_mac 00:11:22:33:44:55
-# option src_port 1024
-# option src_dport 80
-# option dest_ip 194.25.2.129
-# option dest_port 120
-# option proto tcp
+++ /dev/null
-#!/bin/sh /etc/rc.common
-# Copyright (C) 2008 OpenWrt.org
-
-START=45
-
-start() {
- . /lib/firewall/uci_firewall.sh
- fw_init
-}
-
-stop() {
- . /lib/firewall/uci_firewall.sh
- fw_stop
-}
+++ /dev/null
-#!/bin/sh
-# Copyright (C) 2008 John Crispin <blogic@openwrt.org>
-
-. /etc/functions.sh
-
-IPTABLES="echo iptables"
-IPTABLES=iptables
-
-config_clear
-include /lib/network
-scan_interfaces
-
-CONFIG_APPEND=1
-config_load firewall
-
-config fw_zones
-ZONE_LIST=$CONFIG_SECTION
-
-DEF_INPUT=DROP
-DEF_OUTPUT=DROP
-DEF_FORWARD=DROP
-
-load_policy() {
- config_get input $1 input
- config_get output $1 output
- config_get forward $1 forward
-
- [ -z "$input" ] && input=$DEF_INPUT
- [ -z "$output" ] && output=$DEF_OUTPUT
- [ -z "$forward" ] && forward=$DEF_FORWARD
-}
-
-create_zone() {
- local exists
-
- [ "$1" == "loopback" ] && return
-
- config_get exists $ZONE_LIST $1
- [ -n "$exists" ] && return
- config_set $ZONE_LIST $1 1
-
- $IPTABLES -N zone_$1
- $IPTABLES -N zone_$1_ACCEPT
- $IPTABLES -N zone_$1_DROP
- $IPTABLES -N zone_$1_REJECT
- $IPTABLES -N zone_$1_forward
- $IPTABLES -A zone_$1_forward -j zone_$1_$5
- $IPTABLES -A zone_$1 -j zone_$1_$3
- $IPTABLES -A OUTPUT -j zone_$1_$4
- $IPTABLES -N zone_$1_nat -t nat
- $IPTABLES -N zone_$1_prerouting -t nat
- [ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$2_nat
-}
-
-addif() {
- logger "adding $1 to firewall zone $2"
- $IPTABLES -A INPUT -i $1 -j zone_$2
- $IPTABLES -I zone_$2_ACCEPT 1 -o $1 -j ACCEPT
- $IPTABLES -I zone_$2_DROP 1 -o $1 -j DROP
- $IPTABLES -I zone_$2_REJECT 1 -o $1 -j REJECT
- $IPTABLES -I zone_$2_ACCEPT 1 -i $1 -j ACCEPT
- $IPTABLES -I zone_$2_DROP 1 -i $1 -j DROP
- $IPTABLES -I zone_$2_REJECT 1 -i $1 -j REJECT
- $IPTABLES -I zone_$2_nat 1 -t nat -o $1 -j MASQUERADE
- $IPTABLES -I PREROUTING 1 -t nat -i $1 -j zone_$2_prerouting
- $IPTABLES -A FORWARD -i $1 -j zone_$2_forward
-}
-
-delif() {
- logger "removing $1 from firewall zone $2"
- $IPTABLES -D INPUT -i $1 -j zone_$2
- $IPTABLES -D zone_$2_ACCEPT -o $1 -j ACCEPT
- $IPTABLES -D zone_$2_DROP -o $1 -j DROP
- $IPTABLES -D zone_$2_REJECT -o $1 -j REJECT
- $IPTABLES -D zone_$2_ACCEPT -i $1 -j ACCEPT
- $IPTABLES -D zone_$2_DROP -i $1 -j DROP
- $IPTABLES -D zone_$2_REJECT -i $1 -j REJECT
- $IPTABLES -D zone_$2_nat -t nat -o $1 -j MASQUERADE
- $IPTABLES -D PREROUTING -t nat -i $1 -j zone_$2_prerouting
- $IPTABLES -D FORWARD -i $1 -j zone_$2_forward
-}
-
-load_synflood() {
- echo "Loading synflood protection"
- $IPTABLES -N SYN_FLOOD
- $IPTABLES -A SYN_FLOOD -p tcp --syn -m limit --limit ${1}/second --limit-burst $2 -j RETURN
- $IPTABLES -A SYN_FLOOD -p ! tcp -j RETURN
- $IPTABLES -A SYN_FLOOD -p tcp ! --syn -j RETURN
- $IPTABLES -A SYN_FLOOD -j LOG --log-prefix "syn_flood: "
- $IPTABLES -A SYN_FLOOD -j DROP
- $IPTABLES -A INPUT -p tcp --syn -j SYN_FLOOD
-}
-
-fw_defaults() {
- load_policy $1
- DEF_INPUT=$input
- DEF_OUTPUT=$output
- DEF_FORWARD=$forward
-
- echo 1 > /proc/sys/net/ipv4/tcp_syncookies
- for f in /proc/sys/net/ipv4/conf/*/accept_redirects
- do
- echo 0 > $f
- done
- for f in /proc/sys/net/ipv4/conf/*/accept_source_route
- do
- echo 0 > $f
- done
-
- $IPTABLES -F
- $IPTABLES -t nat -F
- $IPTABLES -t mangle -F
- $IPTABLES -X -t nat
- $IPTABLES -X
-
- $IPTABLES -P INPUT $input
- $IPTABLES -A INPUT -m state --state INVALID -j DROP
- $IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-
- $IPTABLES -P OUTPUT $output
- $IPTABLES -A OUTPUT -m state --state INVALID -j DROP
- $IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-
- $IPTABLES -P FORWARD $forward
- $IPTABLES -A FORWARD -m state --state INVALID -j DROP
- $IPTABLES -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
- $IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
-
- $IPTABLES -A INPUT -i lo -j ACCEPT
- $IPTABLES -A OUTPUT -o lo -j ACCEPT
-
- config_get syn_flood $1 syn_flood
- config_get syn_rate $1 syn_rate
- config_get syn_burst $1 syn_burst
-
- [ -z "$syn_rate" ] && syn_rate=25
- [ -z "$syn_burst" ] && syn_burst=50
- [ "$syn_flood" == "1" ] && load_synflood $syn_rate $syn_burst
-}
-
-fw_zone() {
- local name
- local network
- local masq
-
- config_get name $1 name
- config_get network $1 network
- config_get masq $1 masq
- load_policy $1
-
- [ -z "$network" ] && network=$name
- create_zone "$name" "$network" "$input" "$output" "$forward" "$masq"
-}
-
-fw_rule() {
- local src
- local src_ip
- local src_mac
- local src_port
- local src_mac
- local dest
- local dest_ip
- local dest_port
- local proto
- local target
-
- config_get src $1 src
- config_get src_ip $1 src_ip
- config_get src_mac $1 src_mac
- config_get src_port $1 src_port
- config_get dest $1 dest
- config_get dest_ip $1 dest_ip
- config_get dest_port $1 dest_port
- config_get proto $1 proto
- config_get target $1 target
- config_get ruleset $1 ruleset
-
- [ -z "$target" ] && target=DROP
- [ -n "$src" ] && ZONE=zone_$src || ZONE=INPUT
- [ -n "$dest" ] && TARGET=zone_${dest}_$target || TARGET=$target
- $IPTABLES -I $ZONE 1 \
- ${proto:+-p $proto} \
- ${src_ip:+-s $src_ip} \
- ${src_port:+--sport $src_port} \
- ${src_mac:+-m mac --mac-source $src_mac} \
- ${dest_ip:+-d $dest_ip} \
- ${dest_port:+--dport $dest_port} \
- -j $TARGET
-}
-
-fw_forwarding() {
- local src
- local dest
- local masq
-
- config_get src $1 src
- config_get dest $1 dest
- [ -n "$src" ] && z_src=zone_${src}_forward || z_src=FORWARD
- [ -n "$dest" ] && z_dest=zone_${dest}_ACCEPT || z_dest=ACCEPT
- $IPTABLES -I $z_src 1 -j $z_dest
-}
-
-fw_redirect() {
- local src
- local src_ip
- local src_port
- local src_dport
- local src_mac
- local dest_ip
- local dest_port
- local protocol
-
- config_get src $1 src
- config_get src_ip $1 src_ip
- config_get src_port $1 src_port
- config_get src_dport $1 src_dport
- config_get src_mac $1 src_mac
- config_get dest_ip $1 dest_ip
- config_get dest_port $1 dest_port
- config_get protocol $1 protocol
- [ -z "$src" -o -z "$dest_ip" ] && { \
- echo "redirect needs src and dest_ip"; return ; }
- $IPTABLES -A zone_${src}_prerouting -t nat \
- ${protocol:+-p $protocol} \
- ${src_ip:+-s $srcdip} \
- ${src_port:+--sport $src_port} \
- ${src_dport:+--dport $src_dport} \
- ${src_mac:+-m mac --mac-source $src_mac} \
- -j DNAT --to-destination $dest_ip${dest_port:+:$dest_port}
- $IPTABLES -I zone_${src}_forward 1 \
- ${protocol:+-p $protocol} \
- -d $dest_ip \
- ${src_ip:+-s $srcdip} \
- ${src_port:+--sport $src_port} \
- ${dest_port:+--dport $dest_port} \
- ${src_mac:+-m mac --mac-source $src_mac} \
- -j ACCEPT
-}
-
-fw_include() {
- local path
- config_get path $1 path
- [ -e $path ] && . $path
-}
-
-fw_addif() {
- local up
- local ifname
- config_get up $1 up
- config_get ifname $1 ifname
- [ -n "$up" ] || return 0
- (ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall)
-}
-
-fw_init() {
- echo "Loading defaults"
- config_foreach fw_defaults defaults
- echo "Loading zones"
- config_foreach fw_zone zone
- echo "Loading rules"
- config_foreach fw_rule rule
- echo "Loading forwarding"
- config_foreach fw_forwarding forwarding
- echo "Loading redirects"
- config_foreach fw_redirect redirect
- echo "Loading includes"
- config_foreach fw_include include
-
- uci_set_state firewall core "" firewall_state
- uci_set_state firewall core loaded 1
- unset CONFIG_APPEND
- config_load network
- config_foreach fw_addif interface
-}
-
-fw_stop() {
- $IPTABLES -F
- $IPTABLES -t nat -F
- $IPTABLES -t mangle -F
- $IPTABLES -X -t nat
- $IPTABLES -X
- $IPTABLES -P INPUT ACCEPT
- $IPTABLES -P OUTPUT ACCEPT
- $IPTABLES -P FORWARD ACCEPT
-}
+++ /dev/null
-# Copyright (C) 2006 OpenWrt.org
-
-BEGIN {
- FS=":"
-}
-
-($1 == "accept") || ($1 == "drop") || ($1 == "forward") {
- delete _opt
- str2data($2)
- if ((_l["proto"] == "") && (_l["sport"] _l["dport"] != "")) {
- _opt[0] = " -p tcp"
- _opt[1] = " -p udp"
- } else {
- _opt[0] = ""
- }
-}
-
-($1 == "accept") {
- target = " -j ACCEPT"
- for (o in _opt) {
- print "iptables -t nat -A prerouting_wan" _opt[o] str2ipt($2) target
- print "iptables -A input_wan " _opt[o] str2ipt($2) target
- print ""
- }
-}
-
-($1 == "drop") {
- for (o in _opt) {
- print "iptables -t nat -A prerouting_wan" _opt[o] str2ipt($2) " -j DROP"
- print ""
- }
-}
-
-($1 == "forward") {
- target = " -j DNAT --to " $3
- fwopts = ""
- if ($4 != "") {
- if ((_l["proto"] == "tcp") || (_l["proto"] == "udp") || (_l["proto"] == "")) {
- if (_l["proto"] != "") fwopts = " -p " _l["proto"]
- fwopts = fwopts " --dport " $4
- target = target ":" $4
- }
- else fwopts = ""
- }
- for (o in _opt) {
- print "iptables -t nat -A prerouting_wan" _opt[o] str2ipt($2) target
- print "iptables -A forwarding_wan " _opt[o] " -d " $3 fwopts " -j ACCEPT"
- print ""
- }
-}
+++ /dev/null
-# Copyright (C) 2006 OpenWrt.org
-
-# RULE SYNTAX:
-#
-# forward:<match>:<target>[:<port>]
-# - forwards all packets matched by <match> to <target>,
-# optionally changing the port to <port>
-#
-# accept:<match>
-# - accepts all traffic matched by <match>
-#
-# drop:<match>
-# - drops all traffic matched by <match>
-#
-#
-# MATCHING OPTIONS:
-#
-# src=<ip>
-# - match the source ip <ip>
-#
-# dest=<ip>
-# - match the destination ip <ip>
-#
-# proto=<proto>
-# - match the protocol by name or number
-#
-# sport=<port(s)>
-# - match the source port(s), see below for syntax
-#
-# dport=<port(s)>
-# - match the destination port(s), see below for syntax
-#
-#
-#
-# PORT SYNTAX:
-#
-# You can enter an arbitrary list of ports and port ranges in the following format:
-# - 22,53,993,1000-1024
-#
-# If you don't set the protocol to tcp or udp, it will apply to both
-#
-#
-#
-# EXAMPLES:
-#
-# drop:dport=22 src=1.3.3.7
-# accept:proto=tcp dport=22
-# forward:dport=60168:192.168.1.2:60169
+++ /dev/null
-#!/bin/sh /etc/rc.common
-# Copyright (C) 2006 OpenWrt.org
-
-## Please make changes in /etc/firewall.user
-START=45
-start() {
- include /lib/network
- scan_interfaces
-
- config_get WAN wan ifname
- config_get WANDEV wan device
- config_get LAN lan ifname
- config_get_bool NAT_LAN lan nat 1
- if [ $NAT_LAN -ne 0 ]
- then
- config_get LAN_MASK lan netmask
- config_get LAN_IP lan ipaddr
- LAN_NET=$(/bin/ipcalc.sh $LAN_IP $LAN_MASK | grep NETWORK | cut -d= -f2)
- fi
-
- ## CLEAR TABLES
- for T in filter nat; do
- iptables -t $T -F
- iptables -t $T -X
- done
-
- iptables -N input_rule
- iptables -N input_wan
- iptables -N output_rule
- iptables -N forwarding_rule
- iptables -N forwarding_wan
-
- iptables -t nat -N NEW
- iptables -t nat -N prerouting_rule
- iptables -t nat -N prerouting_wan
- iptables -t nat -N postrouting_rule
-
- iptables -N LAN_ACCEPT
- [ -z "$WAN" ] || iptables -A LAN_ACCEPT -i "$WAN" -j RETURN
- [ -z "$WANDEV" -o "$WANDEV" = "$WAN" ] || iptables -A LAN_ACCEPT -i "$WANDEV" -j RETURN
- iptables -A LAN_ACCEPT -j ACCEPT
-
- ### INPUT
- ### (connections with the router as destination)
-
- # base case
- iptables -P INPUT DROP
- iptables -A INPUT -m state --state INVALID -j DROP
- iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
- iptables -A INPUT -p tcp --tcp-flags SYN SYN --tcp-option \! 2 -j DROP
-
- #
- # insert accept rule or to jump to new accept-check table here
- #
- iptables -A INPUT -j input_rule
- [ -z "$WAN" ] || iptables -A INPUT -i $WAN -j input_wan
-
- # allow
- iptables -A INPUT -j LAN_ACCEPT # allow from lan/wifi interfaces
- iptables -A INPUT -p icmp -j ACCEPT # allow ICMP
- iptables -A INPUT -p gre -j ACCEPT # allow GRE
-
- # reject (what to do with anything not allowed earlier)
- iptables -A INPUT -p tcp -j REJECT --reject-with tcp-reset
- iptables -A INPUT -j REJECT --reject-with icmp-port-unreachable
-
- ### OUTPUT
- ### (connections with the router as source)
-
- # base case
- iptables -P OUTPUT DROP
- iptables -A OUTPUT -m state --state INVALID -j DROP
- iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-
- #
- # insert accept rule or to jump to new accept-check table here
- #
- iptables -A OUTPUT -j output_rule
-
- # allow
- iptables -A OUTPUT -j ACCEPT #allow everything out
-
- # reject (what to do with anything not allowed earlier)
- iptables -A OUTPUT -p tcp -j REJECT --reject-with tcp-reset
- iptables -A OUTPUT -j REJECT --reject-with icmp-port-unreachable
-
- ### FORWARDING
- ### (connections routed through the router)
-
- # base case
- iptables -P FORWARD DROP
- iptables -A FORWARD -m state --state INVALID -j DROP
- iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
- iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
-
- #
- # insert accept rule or to jump to new accept-check table here
- #
- iptables -A FORWARD -j forwarding_rule
- [ -z "$WAN" ] || iptables -A FORWARD -i $WAN -j forwarding_wan
-
- # allow
- iptables -A FORWARD -i $LAN -o $LAN -j ACCEPT
- [ -z "$WAN" ] || iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT
-
- # reject (what to do with anything not allowed earlier)
- # uses the default -P DROP
-
- ### MASQ
- iptables -t nat -A PREROUTING -m state --state NEW -p tcp -j NEW
- iptables -t nat -A PREROUTING -j prerouting_rule
- [ -z "$WAN" ] || iptables -t nat -A PREROUTING -i "$WAN" -j prerouting_wan
- iptables -t nat -A POSTROUTING -j postrouting_rule
- ### Only LAN, unless told not to
- if [ $NAT_LAN -ne 0 ]
- then
- [ -z "$WAN" ] || iptables -t nat -A POSTROUTING --src $LAN_NET/$LAN_MASK -o $WAN -j MASQUERADE
- fi
-
- iptables -t nat -A NEW -m limit --limit 50 --limit-burst 100 -j RETURN && \
- iptables -t nat -A NEW -j DROP
-
- ## USER RULES
- [ -f /etc/firewall.user ] && . /etc/firewall.user
- [ -n "$WAN" -a -e /etc/firewall.config ] && {
- export WAN
- awk -f /usr/lib/common.awk -f /usr/lib/firewall.awk /etc/firewall.config | ash
- }
-}
-
-stop() {
- iptables -P INPUT ACCEPT
- iptables -P OUTPUT ACCEPT
- iptables -P FORWARD ACCEPT
- iptables -F
- iptables -X
- iptables -t nat -P PREROUTING ACCEPT
- iptables -t nat -P POSTROUTING ACCEPT
- iptables -t nat -P OUTPUT ACCEPT
- iptables -t nat -F
- iptables -t nat -X
-}
+++ /dev/null
-#!/bin/sh
-# Copyright (C) 2006 OpenWrt.org
-
-iptables -F input_rule
-iptables -F output_rule
-iptables -F forwarding_rule
-iptables -t nat -F prerouting_rule
-iptables -t nat -F postrouting_rule
-
-# The following chains are for traffic directed at the IP of the
-# WAN interface
-
-iptables -F input_wan
-iptables -F forwarding_wan
-iptables -t nat -F prerouting_wan
-
-### Open port to WAN
-## -- This allows port 22 to be answered by (dropbear on) the router
-# iptables -t nat -A prerouting_wan -p tcp --dport 22 -j ACCEPT
-# iptables -A input_wan -p tcp --dport 22 -j ACCEPT
-
-### Port forwarding
-## -- This forwards port 8080 on the WAN to port 80 on 192.168.1.2
-# iptables -t nat -A prerouting_wan -p tcp --dport 8080 -j DNAT --to 192.168.1.2:80
-# iptables -A forwarding_wan -p tcp --dport 80 -d 192.168.1.2 -j ACCEPT
-
-### DMZ
-## -- Connections to ports not handled above will be forwarded to 192.168.1.2
-# iptables -t nat -A prerouting_wan -j DNAT --to 192.168.1.2
-# iptables -A forwarding_wan -d 192.168.1.2 -j ACCEPT
--- /dev/null
+#!/bin/sh
+# Copyright (C) 2008 John Crispin <blogic@openwrt.org>
+
+. /etc/functions.sh
+
+IPTABLES="echo iptables"
+IPTABLES=iptables
+
+config_clear
+include /lib/network
+scan_interfaces
+
+CONFIG_APPEND=1
+config_load firewall
+
+config fw_zones
+ZONE_LIST=$CONFIG_SECTION
+
+DEF_INPUT=DROP
+DEF_OUTPUT=DROP
+DEF_FORWARD=DROP
+
+load_policy() {
+ config_get input $1 input
+ config_get output $1 output
+ config_get forward $1 forward
+
+ [ -z "$input" ] && input=$DEF_INPUT
+ [ -z "$output" ] && output=$DEF_OUTPUT
+ [ -z "$forward" ] && forward=$DEF_FORWARD
+}
+
+create_zone() {
+ local exists
+
+ [ "$1" == "loopback" ] && return
+
+ config_get exists $ZONE_LIST $1
+ [ -n "$exists" ] && return
+ config_set $ZONE_LIST $1 1
+
+ $IPTABLES -N zone_$1
+ $IPTABLES -N zone_$1_ACCEPT
+ $IPTABLES -N zone_$1_DROP
+ $IPTABLES -N zone_$1_REJECT
+ $IPTABLES -N zone_$1_forward
+ $IPTABLES -A zone_$1_forward -j zone_$1_$5
+ $IPTABLES -A zone_$1 -j zone_$1_$3
+ $IPTABLES -A OUTPUT -j zone_$1_$4
+ $IPTABLES -N zone_$1_nat -t nat
+ $IPTABLES -N zone_$1_prerouting -t nat
+ [ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$2_nat
+}
+
+addif() {
+ logger "adding $1 to firewall zone $2"
+ $IPTABLES -A INPUT -i $1 -j zone_$2
+ $IPTABLES -I zone_$2_ACCEPT 1 -o $1 -j ACCEPT
+ $IPTABLES -I zone_$2_DROP 1 -o $1 -j DROP
+ $IPTABLES -I zone_$2_REJECT 1 -o $1 -j REJECT
+ $IPTABLES -I zone_$2_ACCEPT 1 -i $1 -j ACCEPT
+ $IPTABLES -I zone_$2_DROP 1 -i $1 -j DROP
+ $IPTABLES -I zone_$2_REJECT 1 -i $1 -j REJECT
+ $IPTABLES -I zone_$2_nat 1 -t nat -o $1 -j MASQUERADE
+ $IPTABLES -I PREROUTING 1 -t nat -i $1 -j zone_$2_prerouting
+ $IPTABLES -A FORWARD -i $1 -j zone_$2_forward
+}
+
+delif() {
+ logger "removing $1 from firewall zone $2"
+ $IPTABLES -D INPUT -i $1 -j zone_$2
+ $IPTABLES -D zone_$2_ACCEPT -o $1 -j ACCEPT
+ $IPTABLES -D zone_$2_DROP -o $1 -j DROP
+ $IPTABLES -D zone_$2_REJECT -o $1 -j REJECT
+ $IPTABLES -D zone_$2_ACCEPT -i $1 -j ACCEPT
+ $IPTABLES -D zone_$2_DROP -i $1 -j DROP
+ $IPTABLES -D zone_$2_REJECT -i $1 -j REJECT
+ $IPTABLES -D zone_$2_nat -t nat -o $1 -j MASQUERADE
+ $IPTABLES -D PREROUTING -t nat -i $1 -j zone_$2_prerouting
+ $IPTABLES -D FORWARD -i $1 -j zone_$2_forward
+}
+
+load_synflood() {
+ echo "Loading synflood protection"
+ $IPTABLES -N SYN_FLOOD
+ $IPTABLES -A SYN_FLOOD -p tcp --syn -m limit --limit ${1}/second --limit-burst $2 -j RETURN
+ $IPTABLES -A SYN_FLOOD -p ! tcp -j RETURN
+ $IPTABLES -A SYN_FLOOD -p tcp ! --syn -j RETURN
+ $IPTABLES -A SYN_FLOOD -j LOG --log-prefix "syn_flood: "
+ $IPTABLES -A SYN_FLOOD -j DROP
+ $IPTABLES -A INPUT -p tcp --syn -j SYN_FLOOD
+}
+
+fw_defaults() {
+ load_policy $1
+ DEF_INPUT=$input
+ DEF_OUTPUT=$output
+ DEF_FORWARD=$forward
+
+ echo 1 > /proc/sys/net/ipv4/tcp_syncookies
+ for f in /proc/sys/net/ipv4/conf/*/accept_redirects
+ do
+ echo 0 > $f
+ done
+ for f in /proc/sys/net/ipv4/conf/*/accept_source_route
+ do
+ echo 0 > $f
+ done
+
+ $IPTABLES -F
+ $IPTABLES -t nat -F
+ $IPTABLES -t mangle -F
+ $IPTABLES -X -t nat
+ $IPTABLES -X
+
+ $IPTABLES -P INPUT $input
+ $IPTABLES -A INPUT -m state --state INVALID -j DROP
+ $IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
+
+ $IPTABLES -P OUTPUT $output
+ $IPTABLES -A OUTPUT -m state --state INVALID -j DROP
+ $IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
+
+ $IPTABLES -P FORWARD $forward
+ $IPTABLES -A FORWARD -m state --state INVALID -j DROP
+ $IPTABLES -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
+ $IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+
+ $IPTABLES -A INPUT -i lo -j ACCEPT
+ $IPTABLES -A OUTPUT -o lo -j ACCEPT
+
+ config_get syn_flood $1 syn_flood
+ config_get syn_rate $1 syn_rate
+ config_get syn_burst $1 syn_burst
+
+ [ -z "$syn_rate" ] && syn_rate=25
+ [ -z "$syn_burst" ] && syn_burst=50
+ [ "$syn_flood" == "1" ] && load_synflood $syn_rate $syn_burst
+}
+
+fw_zone() {
+ local name
+ local network
+ local masq
+
+ config_get name $1 name
+ config_get network $1 network
+ config_get masq $1 masq
+ load_policy $1
+
+ [ -z "$network" ] && network=$name
+ create_zone "$name" "$network" "$input" "$output" "$forward" "$masq"
+}
+
+fw_rule() {
+ local src
+ local src_ip
+ local src_mac
+ local src_port
+ local src_mac
+ local dest
+ local dest_ip
+ local dest_port
+ local proto
+ local target
+
+ config_get src $1 src
+ config_get src_ip $1 src_ip
+ config_get src_mac $1 src_mac
+ config_get src_port $1 src_port
+ config_get dest $1 dest
+ config_get dest_ip $1 dest_ip
+ config_get dest_port $1 dest_port
+ config_get proto $1 proto
+ config_get target $1 target
+ config_get ruleset $1 ruleset
+
+ [ -z "$target" ] && target=DROP
+ [ -n "$src" ] && ZONE=zone_$src || ZONE=INPUT
+ [ -n "$dest" ] && TARGET=zone_${dest}_$target || TARGET=$target
+ $IPTABLES -I $ZONE 1 \
+ ${proto:+-p $proto} \
+ ${src_ip:+-s $src_ip} \
+ ${src_port:+--sport $src_port} \
+ ${src_mac:+-m mac --mac-source $src_mac} \
+ ${dest_ip:+-d $dest_ip} \
+ ${dest_port:+--dport $dest_port} \
+ -j $TARGET
+}
+
+fw_forwarding() {
+ local src
+ local dest
+ local masq
+
+ config_get src $1 src
+ config_get dest $1 dest
+ [ -n "$src" ] && z_src=zone_${src}_forward || z_src=FORWARD
+ [ -n "$dest" ] && z_dest=zone_${dest}_ACCEPT || z_dest=ACCEPT
+ $IPTABLES -I $z_src 1 -j $z_dest
+}
+
+fw_redirect() {
+ local src
+ local src_ip
+ local src_port
+ local src_dport
+ local src_mac
+ local dest_ip
+ local dest_port
+ local protocol
+
+ config_get src $1 src
+ config_get src_ip $1 src_ip
+ config_get src_port $1 src_port
+ config_get src_dport $1 src_dport
+ config_get src_mac $1 src_mac
+ config_get dest_ip $1 dest_ip
+ config_get dest_port $1 dest_port
+ config_get protocol $1 protocol
+ [ -z "$src" -o -z "$dest_ip" ] && { \
+ echo "redirect needs src and dest_ip"; return ; }
+ $IPTABLES -A zone_${src}_prerouting -t nat \
+ ${protocol:+-p $protocol} \
+ ${src_ip:+-s $srcdip} \
+ ${src_port:+--sport $src_port} \
+ ${src_dport:+--dport $src_dport} \
+ ${src_mac:+-m mac --mac-source $src_mac} \
+ -j DNAT --to-destination $dest_ip${dest_port:+:$dest_port}
+ $IPTABLES -I zone_${src}_forward 1 \
+ ${protocol:+-p $protocol} \
+ -d $dest_ip \
+ ${src_ip:+-s $srcdip} \
+ ${src_port:+--sport $src_port} \
+ ${dest_port:+--dport $dest_port} \
+ ${src_mac:+-m mac --mac-source $src_mac} \
+ -j ACCEPT
+}
+
+fw_include() {
+ local path
+ config_get path $1 path
+ [ -e $path ] && . $path
+}
+
+fw_addif() {
+ local up
+ local ifname
+ config_get up $1 up
+ config_get ifname $1 ifname
+ [ -n "$up" ] || return 0
+ (ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall)
+}
+
+fw_init() {
+ echo "Loading defaults"
+ config_foreach fw_defaults defaults
+ echo "Loading zones"
+ config_foreach fw_zone zone
+ echo "Loading rules"
+ config_foreach fw_rule rule
+ echo "Loading forwarding"
+ config_foreach fw_forwarding forwarding
+ echo "Loading redirects"
+ config_foreach fw_redirect redirect
+ echo "Loading includes"
+ config_foreach fw_include include
+
+ uci_set_state firewall core "" firewall_state
+ uci_set_state firewall core loaded 1
+ unset CONFIG_APPEND
+ config_load network
+ config_foreach fw_addif interface
+}
+
+fw_stop() {
+ $IPTABLES -F
+ $IPTABLES -t nat -F
+ $IPTABLES -t mangle -F
+ $IPTABLES -X -t nat
+ $IPTABLES -X
+ $IPTABLES -P INPUT ACCEPT
+ $IPTABLES -P OUTPUT ACCEPT
+ $IPTABLES -P FORWARD ACCEPT
+}
projects / openwrt / openwrt.git / commitdiff