285 lines
7 KiB
Bash
Executable file
285 lines
7 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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DEF_INPUT=DROP
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DEF_OUTPUT=DROP
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DEF_FORWARD=DROP
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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 $1 forward
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[ -z "$input" ] && input=$DEF_INPUT
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[ -z "$output" ] && output=$DEF_OUTPUT
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[ -z "$forward" ] && forward=$DEF_FORWARD
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}
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create_zone() {
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local exists
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[ "$1" == "loopback" ] && return
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config_get exists $ZONE_LIST $1
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[ -n "$exists" ] && return
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config_set $ZONE_LIST $1 1
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$IPTABLES -N zone_$1
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$IPTABLES -N zone_$1_ACCEPT
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$IPTABLES -N zone_$1_DROP
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$IPTABLES -N zone_$1_REJECT
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$IPTABLES -N zone_$1_forward
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$IPTABLES -A zone_$1_forward -j zone_$1_$5
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$IPTABLES -A zone_$1 -j zone_$1_$3
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$IPTABLES -A OUTPUT -j zone_$1_$4
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$IPTABLES -N zone_$1_nat -t nat
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$IPTABLES -N zone_$1_prerouting -t nat
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[ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$2_nat
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}
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addif() {
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logger "adding $1 to firewall zone $2"
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$IPTABLES -A INPUT -i $1 -j zone_$2
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$IPTABLES -I zone_$2_ACCEPT 1 -o $1 -j ACCEPT
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$IPTABLES -I zone_$2_DROP 1 -o $1 -j DROP
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$IPTABLES -I zone_$2_REJECT 1 -o $1 -j REJECT
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$IPTABLES -I zone_$2_ACCEPT 1 -i $1 -j ACCEPT
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$IPTABLES -I zone_$2_DROP 1 -i $1 -j DROP
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$IPTABLES -I zone_$2_REJECT 1 -i $1 -j REJECT
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$IPTABLES -I zone_$2_nat 1 -t nat -o $1 -j MASQUERADE
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$IPTABLES -I PREROUTING 1 -t nat -i $1 -j zone_$2_prerouting
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$IPTABLES -A FORWARD -i $1 -j zone_$2_forward
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}
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delif() {
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logger "removing $1 from firewall zone $2"
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$IPTABLES -D INPUT -i $1 -j zone_$2
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$IPTABLES -D zone_$2_ACCEPT -o $1 -j ACCEPT
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$IPTABLES -D zone_$2_DROP -o $1 -j DROP
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$IPTABLES -D zone_$2_REJECT -o $1 -j REJECT
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$IPTABLES -D zone_$2_ACCEPT -i $1 -j ACCEPT
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$IPTABLES -D zone_$2_DROP -i $1 -j DROP
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$IPTABLES -D zone_$2_REJECT -i $1 -j REJECT
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$IPTABLES -D zone_$2_nat -t nat -o $1 -j MASQUERADE
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$IPTABLES -D PREROUTING -t nat -i $1 -j zone_$2_prerouting
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$IPTABLES -D FORWARD -i $1 -j zone_$2_forward
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}
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load_synflood() {
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echo "Loading synflood protection"
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$IPTABLES -N SYN_FLOOD
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$IPTABLES -A SYN_FLOOD -p tcp --syn -m limit --limit ${1}/second --limit-burst $2 -j RETURN
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$IPTABLES -A SYN_FLOOD -p ! tcp -j RETURN
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$IPTABLES -A SYN_FLOOD -p tcp ! --syn -j RETURN
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$IPTABLES -A SYN_FLOOD -j LOG --log-prefix "syn_flood: "
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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_defaults() {
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load_policy $1
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DEF_INPUT=$input
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DEF_OUTPUT=$output
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DEF_FORWARD=$forward
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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 > $f
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done
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$IPTABLES -F
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$IPTABLES -t nat -F
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$IPTABLES -t mangle -F
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$IPTABLES -X -t nat
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$IPTABLES -X
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$IPTABLES -P INPUT $input
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$IPTABLES -A INPUT -m state --state INVALID -j DROP
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$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPTABLES -P OUTPUT $output
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$IPTABLES -A OUTPUT -m state --state INVALID -j DROP
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$IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPTABLES -P FORWARD $forward
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$IPTABLES -A FORWARD -m state --state INVALID -j DROP
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$IPTABLES -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
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$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 $1 syn_burst
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[ -z "$syn_rate" ] && syn_rate=25
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[ -z "$syn_burst" ] && syn_burst=50
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[ "$syn_flood" == "1" ] && load_synflood $syn_rate $syn_burst
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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 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 masq $1 masq
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load_policy $1
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[ -z "$network" ] && network=$name
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create_zone "$name" "$network" "$input" "$output" "$forward" "$masq"
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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 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_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 target $1 target
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config_get ruleset $1 ruleset
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[ -z "$target" ] && target=DROP
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[ -n "$src" ] && ZONE=zone_$src || ZONE=INPUT
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[ -n "$dest" ] && TARGET=zone_${dest}_$target || TARGET=$target
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$IPTABLES -I $ZONE 1 \
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${proto:+-p $proto} \
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${src_ip:+-s $src_ip} \
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${src_port:+--sport $src_port} \
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${src_mac:+-m mac --mac-source $src_mac} \
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${dest_ip:+-d $dest_ip} \
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${dest_port:+--dport $dest_port} \
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-j $TARGET
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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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}
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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_port
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local src_dport
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local src_mac
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local dest_ip
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local dest_port
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local protocol
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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_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_ip $1 dest_ip
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config_get dest_port $1 dest_port
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config_get protocol $1 protocol
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[ -z "$src" -o -z "$dest_ip" ] && { \
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echo "redirect needs src and dest_ip"; return ; }
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$IPTABLES -A zone_${src}_prerouting -t nat \
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${protocol:+-p $protocol} \
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${src_ip:+-s $srcdip} \
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${src_port:+--sport $src_port} \
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${src_dport:+--dport $src_dport} \
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${src_mac:+-m mac --mac-source $src_mac} \
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-j DNAT --to-destination $dest_ip${dest_port:+:$dest_port}
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$IPTABLES -I zone_${src}_forward 1 \
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${protocol:+-p $protocol} \
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-d $dest_ip \
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${src_ip:+-s $srcdip} \
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${src_port:+--sport $src_port} \
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${dest_port:+--dport $dest_port} \
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${src_mac:+-m mac --mac-source $src_mac} \
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-j ACCEPT
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}
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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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fw_addif() {
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local up
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local ifname
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config_get up $1 up
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config_get ifname $1 ifname
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[ -n "$up" ] || return 0
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(ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall)
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}
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fw_init() {
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echo "Loading defaults"
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config_foreach fw_defaults defaults
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echo "Loading zones"
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config_foreach fw_zone zone
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echo "Loading rules"
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config_foreach fw_rule rule
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echo "Loading forwarding"
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config_foreach fw_forwarding forwarding
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echo "Loading redirects"
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config_foreach fw_redirect redirect
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echo "Loading includes"
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config_foreach fw_include include
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uci_set_state firewall core "" firewall_state
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uci_set_state firewall core loaded 1
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unset CONFIG_APPEND
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config_load network
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config_foreach fw_addif interface
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}
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fw_stop() {
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$IPTABLES -F
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$IPTABLES -t nat -F
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$IPTABLES -t mangle -F
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$IPTABLES -X -t nat
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$IPTABLES -X
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$IPTABLES -P INPUT ACCEPT
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$IPTABLES -P OUTPUT ACCEPT
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$IPTABLES -P FORWARD ACCEPT
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}
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