diff options
Diffstat (limited to 'package/firewall/files/uci_firewall.sh')
| -rwxr-xr-x | package/firewall/files/uci_firewall.sh | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/package/firewall/files/uci_firewall.sh b/package/firewall/files/uci_firewall.sh new file mode 100755 index 0000000000..e1683e9cf0 --- /dev/null +++ b/package/firewall/files/uci_firewall.sh @@ -0,0 +1,285 @@ +#!/bin/sh +# Copyright (C) 2008 John Crispin <blogic@openwrt.org> + +. /etc/functions.sh + +IPTABLES="echo iptables" +IPTABLES=iptables + +config_clear +include /lib/network +scan_interfaces + +CONFIG_APPEND=1 +config_load firewall + +config fw_zones +ZONE_LIST=$CONFIG_SECTION + +DEF_INPUT=DROP +DEF_OUTPUT=DROP +DEF_FORWARD=DROP + +load_policy() { + config_get input $1 input + config_get output $1 output + config_get forward $1 forward + + [ -z "$input" ] && input=$DEF_INPUT + [ -z "$output" ] && output=$DEF_OUTPUT + [ -z "$forward" ] && forward=$DEF_FORWARD +} + +create_zone() { + local exists + + [ "$1" == "loopback" ] && return + + config_get exists $ZONE_LIST $1 + [ -n "$exists" ] && return + config_set $ZONE_LIST $1 1 + + $IPTABLES -N zone_$1 + $IPTABLES -N zone_$1_ACCEPT + $IPTABLES -N zone_$1_DROP + $IPTABLES -N zone_$1_REJECT + $IPTABLES -N zone_$1_forward + $IPTABLES -A zone_$1_forward -j zone_$1_$5 + $IPTABLES -A zone_$1 -j zone_$1_$3 + $IPTABLES -A OUTPUT -j zone_$1_$4 + $IPTABLES -N zone_$1_nat -t nat + $IPTABLES -N zone_$1_prerouting -t nat + [ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$2_nat +} + +addif() { + logger "adding $1 to firewall zone $2" + $IPTABLES -A INPUT -i $1 -j zone_$2 + $IPTABLES -I zone_$2_ACCEPT 1 -o $1 -j ACCEPT + $IPTABLES -I zone_$2_DROP 1 -o $1 -j DROP + $IPTABLES -I zone_$2_REJECT 1 -o $1 -j REJECT + $IPTABLES -I zone_$2_ACCEPT 1 -i $1 -j ACCEPT + $IPTABLES -I zone_$2_DROP 1 -i $1 -j DROP + $IPTABLES -I zone_$2_REJECT 1 -i $1 -j REJECT + $IPTABLES -I zone_$2_nat 1 -t nat -o $1 -j MASQUERADE + $IPTABLES -I PREROUTING 1 -t nat -i $1 -j zone_$2_prerouting + $IPTABLES -A FORWARD -i $1 -j zone_$2_forward +} + +delif() { + logger "removing $1 from firewall zone $2" + $IPTABLES -D INPUT -i $1 -j zone_$2 + $IPTABLES -D zone_$2_ACCEPT -o $1 -j ACCEPT + $IPTABLES -D zone_$2_DROP -o $1 -j DROP + $IPTABLES -D zone_$2_REJECT -o $1 -j REJECT + $IPTABLES -D zone_$2_ACCEPT -i $1 -j ACCEPT + $IPTABLES -D zone_$2_DROP -i $1 -j DROP + $IPTABLES -D zone_$2_REJECT -i $1 -j REJECT + $IPTABLES -D zone_$2_nat -t nat -o $1 -j MASQUERADE + $IPTABLES -D PREROUTING -t nat -i $1 -j zone_$2_prerouting + $IPTABLES -D FORWARD -i $1 -j zone_$2_forward +} + +load_synflood() { + echo "Loading synflood protection" + $IPTABLES -N SYN_FLOOD + $IPTABLES -A SYN_FLOOD -p tcp --syn -m limit --limit ${1}/second --limit-burst $2 -j RETURN + $IPTABLES -A SYN_FLOOD -p ! tcp -j RETURN + $IPTABLES -A SYN_FLOOD -p tcp ! --syn -j RETURN + $IPTABLES -A SYN_FLOOD -j LOG --log-prefix "syn_flood: " + $IPTABLES -A SYN_FLOOD -j DROP + $IPTABLES -A INPUT -p tcp --syn -j SYN_FLOOD +} + +fw_defaults() { + load_policy $1 + DEF_INPUT=$input + DEF_OUTPUT=$output + DEF_FORWARD=$forward + + echo 1 > /proc/sys/net/ipv4/tcp_syncookies + for f in /proc/sys/net/ipv4/conf/*/accept_redirects + do + echo 0 > $f + done + for f in /proc/sys/net/ipv4/conf/*/accept_source_route + do + echo 0 > $f + done + + $IPTABLES -F + $IPTABLES -t nat -F + $IPTABLES -t mangle -F + $IPTABLES -X -t nat + $IPTABLES -X + + $IPTABLES -P INPUT $input + $IPTABLES -A INPUT -m state --state INVALID -j DROP + $IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT + + $IPTABLES -P OUTPUT $output + $IPTABLES -A OUTPUT -m state --state INVALID -j DROP + $IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT + + $IPTABLES -P FORWARD $forward + $IPTABLES -A FORWARD -m state --state INVALID -j DROP + $IPTABLES -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu + $IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT + + $IPTABLES -A INPUT -i lo -j ACCEPT + $IPTABLES -A OUTPUT -o lo -j ACCEPT + + config_get syn_flood $1 syn_flood + config_get syn_rate $1 syn_rate + config_get syn_burst $1 syn_burst + + [ -z "$syn_rate" ] && syn_rate=25 + [ -z "$syn_burst" ] && syn_burst=50 + [ "$syn_flood" == "1" ] && load_synflood $syn_rate $syn_burst +} + +fw_zone() { + local name + local network + local masq + + config_get name $1 name + config_get network $1 network + config_get masq $1 masq + load_policy $1 + + [ -z "$network" ] && network=$name + create_zone "$name" "$network" "$input" "$output" "$forward" "$masq" +} + +fw_rule() { + local src + local src_ip + local src_mac + local src_port + local src_mac + local dest + local dest_ip + local dest_port + local proto + local target + + config_get src $1 src + config_get src_ip $1 src_ip + config_get src_mac $1 src_mac + config_get src_port $1 src_port + config_get dest $1 dest + config_get dest_ip $1 dest_ip + config_get dest_port $1 dest_port + config_get proto $1 proto + config_get target $1 target + config_get ruleset $1 ruleset + + [ -z "$target" ] && target=DROP + [ -n "$src" ] && ZONE=zone_$src || ZONE=INPUT + [ -n "$dest" ] && TARGET=zone_${dest}_$target || TARGET=$target + $IPTABLES -I $ZONE 1 \ + ${proto:+-p $proto} \ + ${src_ip:+-s $src_ip} \ + ${src_port:+--sport $src_port} \ + ${src_mac:+-m mac --mac-source $src_mac} \ + ${dest_ip:+-d $dest_ip} \ + ${dest_port:+--dport $dest_port} \ + -j $TARGET +} + +fw_forwarding() { + local src + local dest + local masq + + config_get src $1 src + config_get dest $1 dest + [ -n "$src" ] && z_src=zone_${src}_forward || z_src=FORWARD + [ -n "$dest" ] && z_dest=zone_${dest}_ACCEPT || z_dest=ACCEPT + $IPTABLES -I $z_src 1 -j $z_dest +} + +fw_redirect() { + local src + local src_ip + local src_port + local src_dport + local src_mac + local dest_ip + local dest_port + local protocol + + config_get src $1 src + config_get src_ip $1 src_ip + config_get src_port $1 src_port + config_get src_dport $1 src_dport + config_get src_mac $1 src_mac + config_get dest_ip $1 dest_ip + config_get dest_port $1 dest_port + config_get protocol $1 protocol + [ -z "$src" -o -z "$dest_ip" ] && { \ + echo "redirect needs src and dest_ip"; return ; } + $IPTABLES -A zone_${src}_prerouting -t nat \ + ${protocol:+-p $protocol} \ + ${src_ip:+-s $srcdip} \ + ${src_port:+--sport $src_port} \ + ${src_dport:+--dport $src_dport} \ + ${src_mac:+-m mac --mac-source $src_mac} \ + -j DNAT --to-destination $dest_ip${dest_port:+:$dest_port} + $IPTABLES -I zone_${src}_forward 1 \ + ${protocol:+-p $protocol} \ + -d $dest_ip \ + ${src_ip:+-s $srcdip} \ + ${src_port:+--sport $src_port} \ + ${dest_port:+--dport $dest_port} \ + ${src_mac:+-m mac --mac-source $src_mac} \ + -j ACCEPT +} + +fw_include() { + local path + config_get path $1 path + [ -e $path ] && . $path +} + +fw_addif() { + local up + local ifname + config_get up $1 up + config_get ifname $1 ifname + [ -n "$up" ] || return 0 + (ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall) +} + +fw_init() { + echo "Loading defaults" + config_foreach fw_defaults defaults + echo "Loading zones" + config_foreach fw_zone zone + echo "Loading rules" + config_foreach fw_rule rule + echo "Loading forwarding" + config_foreach fw_forwarding forwarding + echo "Loading redirects" + config_foreach fw_redirect redirect + echo "Loading includes" + config_foreach fw_include include + + uci_set_state firewall core "" firewall_state + uci_set_state firewall core loaded 1 + unset CONFIG_APPEND + config_load network + config_foreach fw_addif interface +} + +fw_stop() { + $IPTABLES -F + $IPTABLES -t nat -F + $IPTABLES -t mangle -F + $IPTABLES -X -t nat + $IPTABLES -X + $IPTABLES -P INPUT ACCEPT + $IPTABLES -P OUTPUT ACCEPT + $IPTABLES -P FORWARD ACCEPT +} |