Openwrt/package/firewall/files/uci_firewall.sh
2008-08-17 12:01:01 +00:00

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#!/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
local ruleset
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
[ -n "$dest_port" -a -z "$proto" ] && { \
echo "dport may only be used it proto is defined"; return; }
$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 "$dest_ip" ] && { \
echo "redirect needs src and dest_ip"; return ; }
[ -n "$dest_port" -a -z "$protocol" ] && { \
echo "dport may only be used it proto is defined"; return; }
$IPTABLES -A zone_${src}_prerouting -t nat \
${protocol:+-p $protocol} \
${src_ip:+-s $src_ip} \
${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 $src_ip} \
${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
}