mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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c13a8a8058
- backport SNAT changes from trunk - always create zone_x_nat chains, like prerouting - simplify masquerade rule setup - treat proto option as list, allows specifying multiple protocols for rules and redirects - add missing cleanup rule for NOTRACK entries - introduce a helper function to deal with portranges git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@23025 3c298f89-4303-0410-b956-a3cf2f4a3e73
617 lines
15 KiB
Bash
Executable File
617 lines
15 KiB
Bash
Executable File
#!/bin/sh
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# Copyright (C) 2008 John Crispin <blogic@openwrt.org>
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. /etc/functions.sh
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IPTABLES="echo iptables"
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IPTABLES=iptables
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config_clear
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include /lib/network
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scan_interfaces
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CONFIG_APPEND=1
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config_load firewall
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config fw_zones
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ZONE_LIST=$CONFIG_SECTION
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CUSTOM_CHAINS=1
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DEF_INPUT=DROP
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DEF_OUTPUT=DROP
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DEF_FORWARD=DROP
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CONNTRACK_ZONES=
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NOTRACK_DISABLED=
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find_item() {
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local item="$1"; shift
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for i in "$@"; do
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[ "$i" = "$item" ] && return 0
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done
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return 1
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}
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get_portrange() {
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local _var="$1"
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local _range="$2"
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local _delim="${3:-:}"
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local _min="${_range%%[:-]*}"
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local _max="${_range##*[:-]}"
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[ -n "$_min" ] && [ -n "$_max" ] && [ "$_min" != "$_max" ] && \
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export -n -- "$_var=$_min$_delim$_max" || \
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export -n -- "$_var=${_min:-$_max}"
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}
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load_policy() {
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config_get input $1 input
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config_get output $1 output
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config_get forward $1 forward
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DEF_INPUT="${input:-$DEF_INPUT}"
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DEF_OUTPUT="${output:-$DEF_OUTPUT}"
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DEF_FORWARD="${forward:-$DEF_FORWARD}"
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}
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create_zone() {
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local name="$1"
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local network="$2"
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local input="$3"
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local output="$4"
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local forward="$5"
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local mtu_fix="$6"
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local masq="$7"
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local masq_src="$8"
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local masq_dest="$9"
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local exists
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[ "$name" == "loopback" ] && return
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config_get exists $ZONE_LIST $name
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[ -n "$exists" ] && return
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config_set $ZONE_LIST $name 1
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$IPTABLES -N zone_${name}
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$IPTABLES -N zone_${name}_MSSFIX
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$IPTABLES -N zone_${name}_ACCEPT
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$IPTABLES -N zone_${name}_DROP
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$IPTABLES -N zone_${name}_REJECT
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$IPTABLES -N zone_${name}_forward
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[ "$output" ] && $IPTABLES -A output -j zone_${name}_${output}
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$IPTABLES -N zone_${name}_nat -t nat
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$IPTABLES -N zone_${name}_prerouting -t nat
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$IPTABLES -t raw -N zone_${name}_notrack
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[ "$mtu_fix" == "1" ] && $IPTABLES -I FORWARD 1 -j zone_${name}_MSSFIX
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if [ "$masq" == "1" ]; then
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local msrc mdst
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for msrc in ${masq_src:-0.0.0.0/0}; do
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[ "${msrc#!}" != "$msrc" ] && msrc="! -s ${msrc#!}" || msrc="-s $msrc"
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for mdst in ${masq_dest:-0.0.0.0/0}; do
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[ "${mdst#!}" != "$mdst" ] && mdst="! -d ${mdst#!}" || mdst="-d $mdst"
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$IPTABLES -A zone_${name}_nat -t nat $msrc $mdst -j MASQUERADE
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done
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done
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fi
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}
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addif() {
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local network="$1"
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local ifname="$2"
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local zone="$3"
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local n_if n_zone
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config_get n_if core "${network}_ifname"
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config_get n_zone core "${network}_zone"
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[ -n "$n_zone" ] && {
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if [ "$n_zone" != "$zone" ]; then
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delif "$network" "$n_if" "$n_zone"
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else
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return
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fi
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}
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logger "adding $network ($ifname) to firewall zone $zone"
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$IPTABLES -A input -i "$ifname" -j zone_${zone}
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$IPTABLES -I zone_${zone}_MSSFIX 1 -o "$ifname" -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
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$IPTABLES -I zone_${zone}_ACCEPT 1 -o "$ifname" -j ACCEPT
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$IPTABLES -I zone_${zone}_DROP 1 -o "$ifname" -j DROP
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$IPTABLES -I zone_${zone}_REJECT 1 -o "$ifname" -j reject
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$IPTABLES -I zone_${zone}_ACCEPT 1 -i "$ifname" -j ACCEPT
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$IPTABLES -I zone_${zone}_DROP 1 -i "$ifname" -j DROP
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$IPTABLES -I zone_${zone}_REJECT 1 -i "$ifname" -j reject
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$IPTABLES -I PREROUTING 1 -t nat -i "$ifname" -j zone_${zone}_prerouting
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$IPTABLES -I POSTROUTING 1 -t nat -o "$ifname" -j zone_${zone}_nat
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$IPTABLES -A forward -i "$ifname" -j zone_${zone}_forward
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$IPTABLES -I PREROUTING 1 -t raw -i "$ifname" -j zone_${zone}_notrack
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uci_set_state firewall core "${network}_ifname" "$ifname"
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uci_set_state firewall core "${network}_zone" "$zone"
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ACTION=add ZONE="$zone" INTERFACE="$network" DEVICE="$ifname" /sbin/hotplug-call firewall
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}
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delif() {
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local network="$1"
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local ifname="$2"
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local zone="$3"
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logger "removing $network ($ifname) from firewall zone $zone"
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$IPTABLES -D input -i "$ifname" -j zone_$zone
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$IPTABLES -D zone_${zone}_MSSFIX -o "$ifname" -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
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$IPTABLES -D zone_${zone}_ACCEPT -o "$ifname" -j ACCEPT
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$IPTABLES -D zone_${zone}_DROP -o "$ifname" -j DROP
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$IPTABLES -D zone_${zone}_REJECT -o "$ifname" -j reject
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$IPTABLES -D zone_${zone}_ACCEPT -i "$ifname" -j ACCEPT
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$IPTABLES -D zone_${zone}_DROP -i "$ifname" -j DROP
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$IPTABLES -D zone_${zone}_REJECT -i "$ifname" -j reject
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$IPTABLES -D PREROUTING -t nat -i "$ifname" -j zone_${zone}_prerouting
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$IPTABLES -D POSTROUTING -t nat -o "$ifname" -j zone_${zone}_nat
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$IPTABLES -D forward -i "$ifname" -j zone_${zone}_forward
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$IPTABLES -D PREROUTING -t raw -i "$ifname" -j zone_${zone}_notrack
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uci_revert_state firewall core "${network}_ifname"
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uci_revert_state firewall core "${network}_zone"
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ACTION=remove ZONE="$zone" INTERFACE="$network" DEVICE="$ifname" /sbin/hotplug-call firewall
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}
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load_synflood() {
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local rate=${1:-25}
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local burst=${2:-50}
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echo "Loading synflood protection"
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$IPTABLES -N syn_flood
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$IPTABLES -A syn_flood -p tcp --syn -m limit --limit $rate/second --limit-burst $burst -j RETURN
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$IPTABLES -A syn_flood -j DROP
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$IPTABLES -A INPUT -p tcp --syn -j syn_flood
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}
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fw_set_chain_policy() {
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local chain=$1
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local target=$2
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[ "$target" == "REJECT" ] && {
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$IPTABLES -A $chain -j reject
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target=DROP
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}
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$IPTABLES -P $chain $target
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}
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fw_clear() {
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$IPTABLES -F
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$IPTABLES -t nat -F
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$IPTABLES -t nat -X
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$IPTABLES -t raw -F
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$IPTABLES -t raw -X
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$IPTABLES -X
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}
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fw_defaults() {
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[ -n "$DEFAULTS_APPLIED" ] && {
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echo "Error: multiple defaults sections detected"
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return;
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}
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DEFAULTS_APPLIED=1
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load_policy "$1"
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echo 1 > /proc/sys/net/ipv4/tcp_syncookies
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for f in /proc/sys/net/ipv4/conf/*/accept_redirects
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do
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echo 0 > $f
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done
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for f in /proc/sys/net/ipv4/conf/*/accept_source_route
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do
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echo 0 > $f
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done
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uci_revert_state firewall core
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uci_set_state firewall core "" firewall_state
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$IPTABLES -P INPUT DROP
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$IPTABLES -P OUTPUT DROP
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$IPTABLES -P FORWARD DROP
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fw_clear
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config_get_bool drop_invalid $1 drop_invalid 0
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[ "$drop_invalid" -gt 0 ] && {
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$IPTABLES -A INPUT -m state --state INVALID -j DROP
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$IPTABLES -A OUTPUT -m state --state INVALID -j DROP
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$IPTABLES -A FORWARD -m state --state INVALID -j DROP
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NOTRACK_DISABLED=1
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}
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$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPTABLES -A INPUT -i lo -j ACCEPT
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$IPTABLES -A OUTPUT -o lo -j ACCEPT
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config_get syn_flood $1 syn_flood
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config_get syn_rate $1 syn_rate
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config_get syn_burst $1 syn_burst
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[ "$syn_flood" == "1" ] && load_synflood $syn_rate $syn_burst
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echo "Adding custom chains"
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fw_custom_chains
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$IPTABLES -N input
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$IPTABLES -N output
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$IPTABLES -N forward
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$IPTABLES -A INPUT -j input
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$IPTABLES -A OUTPUT -j output
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$IPTABLES -A FORWARD -j forward
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$IPTABLES -N reject
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$IPTABLES -A reject -p tcp -j REJECT --reject-with tcp-reset
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$IPTABLES -A reject -j REJECT --reject-with icmp-port-unreachable
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fw_set_chain_policy INPUT "$DEF_INPUT"
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fw_set_chain_policy OUTPUT "$DEF_OUTPUT"
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fw_set_chain_policy FORWARD "$DEF_FORWARD"
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}
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fw_zone_defaults() {
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local name
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local network
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local masq
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config_get name $1 name
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config_get network $1 network
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config_get_bool masq $1 masq "0"
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config_get_bool conntrack $1 conntrack "0"
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config_get_bool mtu_fix $1 mtu_fix 0
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load_policy $1
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[ "$forward" ] && $IPTABLES -A zone_${name}_forward -j zone_${name}_${forward}
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[ "$input" ] && $IPTABLES -A zone_${name} -j zone_${name}_${input}
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}
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fw_zone() {
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local name
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local network
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local mtu_fix
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local conntrack
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local masq
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local masq_src
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local masq_dest
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config_get name $1 name
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config_get network $1 network
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config_get_bool masq $1 masq "0"
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config_get_bool conntrack $1 conntrack "0"
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config_get_bool mtu_fix $1 mtu_fix 0
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config_get masq_src $1 masq_src
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config_get masq_dest $1 masq_dest
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load_policy $1
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[ "$conntrack" = "1" -o "$masq" = "1" ] && append CONNTRACK_ZONES "$name"
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[ -z "$network" ] && network=$name
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create_zone "$name" "$network" "$input" "$output" "$forward" "$mtu_fix" \
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"$masq" "$masq_src" "$masq_dest"
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fw_custom_chains_zone "$name"
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}
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fw_rule() {
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local src
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local src_ip
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local src_mac
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local src_port
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local src_mac
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local dest
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local dest_ip
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local dest_port
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local proto
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local icmp_type
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local target
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local ruleset
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config_get src $1 src
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config_get src_ip $1 src_ip
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config_get src_mac $1 src_mac
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config_get src_port $1 src_port
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config_get dest $1 dest
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config_get dest_ip $1 dest_ip
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config_get dest_port $1 dest_port
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config_get proto $1 proto
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config_get icmp_type $1 icmp_type
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config_get target $1 target
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config_get ruleset $1 ruleset
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local srcports destports
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get_portrange srcports "$src_port" ":"
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get_portrange destports "$dest_port" ":"
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ZONE=input
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TARGET=$target
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[ -z "$target" ] && target=DROP
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[ -n "$src" -a -z "$dest" ] && ZONE=zone_$src
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[ -n "$src" -a -n "$dest" ] && ZONE=zone_${src}_forward
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[ -n "$dest" ] && TARGET=zone_${dest}_$target
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eval 'RULE_COUNT=$((++RULE_COUNT_'$ZONE'))'
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add_rule() {
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$IPTABLES -I $ZONE $RULE_COUNT \
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${proto:+-p $proto} \
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${icmp_type:+--icmp-type $icmp_type} \
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${src_ip:+-s $src_ip} \
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${srcports:+--sport $srcports} \
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${src_mac:+-m mac --mac-source $src_mac} \
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${dest_ip:+-d $dest_ip} \
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${destports:+--dport $destports} \
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-j $TARGET
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}
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[ "$proto" == "tcpudp" ] && proto="tcp udp"
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for proto in ${proto:-tcp udp}; do
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add_rule
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done
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}
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fw_forwarding() {
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local src
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local dest
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local masq
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config_get src $1 src
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config_get dest $1 dest
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[ -n "$src" ] && z_src=zone_${src}_forward || z_src=forward
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[ -n "$dest" ] && z_dest=zone_${dest}_ACCEPT || z_dest=ACCEPT
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$IPTABLES -I $z_src 1 -j $z_dest
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# propagate masq zone flag
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find_item "$src" $CONNTRACK_ZONES && append CONNTRACK_ZONES $dest
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find_item "$dest" $CONNTRACK_ZONES && append CONNTRACK_ZONES $src
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}
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fw_redirect() {
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local src
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local src_ip
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local src_dip
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local src_port
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local src_dport
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local src_mac
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local dest
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local dest_ip
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local dest_port
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local proto
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local target
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config_get src $1 src
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config_get src_ip $1 src_ip
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config_get src_dip $1 src_dip
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config_get src_port $1 src_port
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config_get src_dport $1 src_dport
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config_get src_mac $1 src_mac
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config_get dest $1 dest
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config_get dest_ip $1 dest_ip
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config_get dest_port $1 dest_port
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config_get proto $1 proto
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config_get target $1 target
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local fwdchain natchain natopt nataddr natports srcdaddr srcdports
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if [ "${target:-DNAT}" == "DNAT" ]; then
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[ -n "$src" -a -n "$dest_ip$dest_port" ] || {
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echo "DNAT redirect needs src and dest_ip or dest_port"
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return
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}
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fwdchain="zone_${src}_forward"
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natopt="--to-destination"
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natchain="zone_${src}_prerouting"
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nataddr="$dest_ip"
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get_portrange natports "$dest_port" "-"
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srcdaddr="$src_dip"
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get_portrange srcdports "$src_dport" ":"
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find_item "$src" $CONNTRACK_ZONES || \
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append CONNTRACK_ZONES "$src"
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elif [ "$target" == "SNAT" ]; then
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[ -n "$dest" -a -n "$src_dip" ] || {
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echo "SNAT redirect needs dest and src_dip"
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return
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}
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fwdchain="${src:+zone_${src}_forward}"
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natopt="--to-source"
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natchain="zone_${dest}_nat"
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nataddr="$src_dip"
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get_portrange natports "$src_dport" "-"
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srcdaddr="$dest_ip"
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get_portrange srcdports "$dest_port" ":"
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find_item "$dest" $CONNTRACK_ZONES || \
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append CONNTRACK_ZONES "$dest"
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else
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echo "redirect target must be either DNAT or SNAT"
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return
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fi
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local srcports destports
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get_portrange srcports "$src_port" ":"
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get_portrange destports "${dest_port-$src_dport}" ":"
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add_rule() {
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$IPTABLES -I $natchain 1 -t nat \
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${proto:+-p $proto} \
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${src_ip:+-s $src_ip} \
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${srcports:+--sport $srcports} \
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${srcdaddr:+-d $srcdaddr} \
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${srcdports:+--dport $srcdports} \
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${src_mac:+-m mac --mac-source $src_mac} \
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-j ${target:-DNAT} $natopt $nataddr${natports:+:$natports}
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[ -n "$dest_ip" ] && \
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$IPTABLES -I ${fwdchain:-forward} 1 \
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${proto:+-p $proto} \
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${src_ip:+-s $src_ip} \
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${srcports:+--sport $srcports} \
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${dest_ip:+-d $dest_ip} \
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${destports:+--dport $destports} \
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${src_mac:+-m mac --mac-source $src_mac} \
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-j ACCEPT
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}
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[ "$proto" == "tcpudp" ] && proto="tcp udp"
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for proto in ${proto:-tcp udp}; do
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add_rule
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done
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}
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fw_include() {
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local path
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config_get path $1 path
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[ -e $path ] && . $path
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}
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get_interface_zones() {
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local interface="$2"
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local name
|
|
local network
|
|
local masq_src
|
|
local masq_dest
|
|
config_get name $1 name
|
|
config_get network $1 network
|
|
config_get masq_src $1 masq_src
|
|
config_get masq_dest $1 masq_dest
|
|
[ -z "$network" ] && network=$name
|
|
for n in $network; do
|
|
[ "$n" = "$interface" ] && {
|
|
append add_zone "$name"
|
|
append add_masq_src "$masq_src"
|
|
append add_masq_dest "$masq_dest"
|
|
}
|
|
done
|
|
}
|
|
|
|
fw_event() {
|
|
local action="$1"
|
|
local interface="$2"
|
|
local ifname="$(sh -c ". /etc/functions.sh; include /lib/network; scan_interfaces; config_get "$interface" ifname")"
|
|
local add_zone=
|
|
local add_masq_src=
|
|
local add_masq_dest=
|
|
local up
|
|
|
|
[ -z "$ifname" ] && return 0
|
|
config_foreach get_interface_zones zone "$interface"
|
|
[ -z "$add_zone" ] && return 0
|
|
|
|
case "$action" in
|
|
ifup)
|
|
for z in $add_zone; do
|
|
local loaded masq_src masq_dest
|
|
config_get loaded core loaded
|
|
[ -n "$loaded" ] && addif "$interface" "$ifname" "$z" "$add_masq_src" "$add_masq_dest"
|
|
done
|
|
;;
|
|
ifdown)
|
|
config_get up "$interface" up
|
|
|
|
for z in $ZONE; do
|
|
local masq_src masq_dest
|
|
config_get masq_src core "${z}_masq_src"
|
|
config_get masq_dest core "${z}_masq_dest"
|
|
[ "$up" == "1" ] && delif "$interface" "$ifname" "$z" "$masq_src" "$masq_dest"
|
|
done
|
|
;;
|
|
esac
|
|
}
|
|
|
|
fw_addif() {
|
|
local up
|
|
local ifname
|
|
config_get up $1 up
|
|
[ -n "$up" ] || return 0
|
|
fw_event ifup "$1"
|
|
}
|
|
|
|
fw_custom_chains() {
|
|
[ -n "$CUSTOM_CHAINS" ] || return 0
|
|
$IPTABLES -N input_rule
|
|
$IPTABLES -N output_rule
|
|
$IPTABLES -N forwarding_rule
|
|
$IPTABLES -N prerouting_rule -t nat
|
|
$IPTABLES -N postrouting_rule -t nat
|
|
|
|
$IPTABLES -A INPUT -j input_rule
|
|
$IPTABLES -A OUTPUT -j output_rule
|
|
$IPTABLES -A FORWARD -j forwarding_rule
|
|
$IPTABLES -A PREROUTING -t nat -j prerouting_rule
|
|
$IPTABLES -A POSTROUTING -t nat -j postrouting_rule
|
|
}
|
|
|
|
fw_custom_chains_zone() {
|
|
local zone="$1"
|
|
|
|
[ -n "$CUSTOM_CHAINS" ] || return 0
|
|
$IPTABLES -N input_${zone}
|
|
$IPTABLES -N forwarding_${zone}
|
|
$IPTABLES -N prerouting_${zone} -t nat
|
|
$IPTABLES -I zone_${zone} 1 -j input_${zone}
|
|
$IPTABLES -I zone_${zone}_forward 1 -j forwarding_${zone}
|
|
$IPTABLES -I zone_${zone}_prerouting 1 -t nat -j prerouting_${zone}
|
|
}
|
|
|
|
fw_check_notrack() {
|
|
local zone="$1"
|
|
config_get name "$zone" name
|
|
[ -n "$NOTRACK_DISABLED" ] || \
|
|
find_item "$name" $CONNTRACK_ZONES || \
|
|
$IPTABLES -t raw -A zone_${name}_notrack -j NOTRACK
|
|
}
|
|
|
|
fw_init() {
|
|
DEFAULTS_APPLIED=
|
|
|
|
echo "Loading defaults"
|
|
config_foreach fw_defaults defaults
|
|
echo "Loading zones"
|
|
config_foreach fw_zone zone
|
|
echo "Loading forwarding"
|
|
config_foreach fw_forwarding forwarding
|
|
echo "Loading redirects"
|
|
config_foreach fw_redirect redirect
|
|
echo "Loading rules"
|
|
config_foreach fw_rule rule
|
|
echo "Loading includes"
|
|
config_foreach fw_include include
|
|
echo "Loading zone defaults"
|
|
config_foreach fw_zone_defaults zone
|
|
uci_set_state firewall core loaded 1
|
|
config_set core loaded 1
|
|
config_foreach fw_check_notrack zone
|
|
INTERFACES="$(sh -c '
|
|
. /etc/functions.sh; config_load network
|
|
echo_up() { local up; config_get_bool up "$1" up 0; [ $up = 1 ] && echo "$1"; }
|
|
config_foreach echo_up interface
|
|
')"
|
|
for interface in $INTERFACES; do
|
|
fw_event ifup "$interface"
|
|
done
|
|
}
|
|
|
|
fw_stop() {
|
|
fw_clear
|
|
$IPTABLES -P INPUT ACCEPT
|
|
$IPTABLES -P OUTPUT ACCEPT
|
|
$IPTABLES -P FORWARD ACCEPT
|
|
uci_revert_state firewall
|
|
}
|