mirror of https://github.com/hak5/openwrt.git
463 lines
12 KiB
Bash
Executable File
463 lines
12 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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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 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_$1_MSSFIX
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$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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[ "$5" ] && $IPTABLES -A zone_$1_forward -j zone_$1_$5
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[ "$3" ] && $IPTABLES -A zone_$1 -j zone_$1_$3
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[ "$4" ] && $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_$1_prerouting -t nat
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$IPTABLES -t raw -N zone_$1_notrack
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[ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$1_nat
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[ "$7" == "1" ] && $IPTABLES -I FORWARD 1 -j zone_$1_MSSFIX
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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 zone_${zone}_nat 1 -t nat -o "$ifname" -j MASQUERADE
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$IPTABLES -I PREROUTING 1 -t nat -i "$ifname" -j zone_${zone}_prerouting
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$IPTABLES -A forward -i "$ifname" -j zone_${zone}_forward
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$IPTABLES -t raw -I PREROUTING 1 -i "$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 zone_${zone}_nat -t nat -o "$ifname" -j MASQUERADE
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$IPTABLES -D PREROUTING -t nat -i "$ifname" -j zone_${zone}_prerouting
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$IPTABLES -D forward -i "$ifname" -j zone_${zone}_forward
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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() {
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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 $1
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[ "$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" "$forward" "$masq" "$mtu_fix"
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fw_custom_chains_zone "$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 $1 ruleset
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src_port_first=${src_port%-*}
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src_port_last=${src_port#*-}
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[ "$src_port_first" -ne "$src_port_last" ] && { \
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src_port="$src_port_first:$src_port_last"; }
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dest_port_first=${dest_port%-*}
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dest_port_last=${dest_port#*-}
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[ "$dest_port_first" -ne "$dest_port_last" ] && { \
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dest_port="$dest_port_first:$dest_port_last"; }
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ZONE=input
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TARGET=$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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add_rule() {
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$IPTABLES -I $ZONE 1 \
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${proto:+-p $proto} \
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${icmp_type:+--icmp-type $icmp_type} \
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${src_ip:+-s $src_ip} \
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${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 $TARGET
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}
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[ "$proto" == "tcpudp" -o -z "$proto" ] && {
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proto=tcp
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add_rule
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proto=udp
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add_rule
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return
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}
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add_rule
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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_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 dest_port2
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local proto
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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 proto $1 proto
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[ -z "$src" -o -z "$dest_ip" ] && { \
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echo "redirect needs src and dest_ip"; return ; }
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src_port_first=${src_port%-*}
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src_port_last=${src_port#*-}
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[ "$src_port_first" -ne "$src_port_last" ] && { \
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src_port="$src_port_first:$src_port_last"; }
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src_dport_first=${src_dport%-*}
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src_dport_last=${src_dport#*-}
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[ "$src_dport_first" -ne "$src_dport_last" ] && { \
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src_dport="$src_dport_first:$src_dport_last"; }
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dest_port2=$dest_port
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dest_port_first=${dest_port2%-*}
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dest_port_last=${dest_port2#*-}
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[ "$dest_port_first" -ne "$dest_port_last" ] && { \
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dest_port2="$dest_port_first:$dest_port_last"; }
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add_rule() {
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$IPTABLES -A zone_${src}_prerouting -t nat \
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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_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_${src}_forward 1 \
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${proto:+-p $proto} \
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-d $dest_ip \
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${src_ip:+-s $src_ip} \
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${src_port:+--sport $src_port} \
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${dest_port2:+--dport $dest_port2} \
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${src_mac:+-m mac --mac-source $src_mac} \
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-j ACCEPT
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}
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[ "$proto" == "tcpudp" -o -z "$proto" ] && {
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proto=tcp
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add_rule
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proto=udp
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add_rule
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return
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}
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add_rule
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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="$1" . /etc/hotplug.d/iface/20-firewall)
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}
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fw_custom_chains() {
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[ -n "$CUSTOM_CHAINS" ] || return 0
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$IPTABLES -N input_rule
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$IPTABLES -N output_rule
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$IPTABLES -N forwarding_rule
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$IPTABLES -N prerouting_rule -t nat
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$IPTABLES -N postrouting_rule -t nat
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$IPTABLES -A INPUT -j input_rule
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$IPTABLES -A OUTPUT -j output_rule
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$IPTABLES -A FORWARD -j forwarding_rule
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$IPTABLES -A PREROUTING -t nat -j prerouting_rule
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$IPTABLES -A POSTROUTING -t nat -j postrouting_rule
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}
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fw_custom_chains_zone() {
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local zone="$1"
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[ -n "$CUSTOM_CHAINS" ] || return 0
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$IPTABLES -N input_${zone}
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$IPTABLES -N forwarding_${zone}
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$IPTABLES -N prerouting_${zone} -t nat
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$IPTABLES -I zone_${zone} 1 -j input_${zone}
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$IPTABLES -I zone_${zone}_forward 1 -j forwarding_${zone}
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$IPTABLES -I zone_${zone}_prerouting 1 -t nat -j prerouting_${zone}
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}
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fw_check_notrack() {
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local zone="$1"
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config_get name "$zone" name
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[ -n "$NOTRACK_DISABLED" ] || \
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find_item "$name" $CONNTRACK_ZONES || \
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$IPTABLES -t raw -A zone_${name}_notrack -j NOTRACK
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}
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fw_init() {
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DEFAULTS_APPLIED=
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echo "Loading defaults"
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config_foreach fw_defaults defaults
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echo "Loading zones"
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config_foreach fw_zone zone
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echo "Loading forwarding"
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config_foreach fw_forwarding forwarding
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echo "Loading redirects"
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config_foreach fw_redirect redirect
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echo "Loading rules"
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config_foreach fw_rule rule
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echo "Loading includes"
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config_foreach fw_include include
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uci_set_state firewall core loaded 1
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config_foreach fw_check_notrack zone
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unset CONFIG_APPEND
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config_load network
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config_foreach fw_addif interface
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}
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fw_stop() {
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fw_clear
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$IPTABLES -P INPUT ACCEPT
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$IPTABLES -P OUTPUT ACCEPT
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$IPTABLES -P FORWARD ACCEPT
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uci_revert_state firewall
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}
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