531 lines
13 KiB
Bash
Executable File
531 lines
13 KiB
Bash
Executable File
#!/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
|
|
|
|
CUSTOM_CHAINS=1
|
|
DEF_INPUT=DROP
|
|
DEF_OUTPUT=DROP
|
|
DEF_FORWARD=DROP
|
|
CONNTRACK_ZONES=
|
|
NOTRACK_DISABLED=
|
|
|
|
find_item() {
|
|
local item="$1"; shift
|
|
for i in "$@"; do
|
|
[ "$i" = "$item" ] && return 0
|
|
done
|
|
return 1
|
|
}
|
|
|
|
load_policy() {
|
|
config_get input $1 input
|
|
config_get output $1 output
|
|
config_get forward $1 forward
|
|
|
|
DEF_INPUT="${input:-$DEF_INPUT}"
|
|
DEF_OUTPUT="${output:-$DEF_OUTPUT}"
|
|
DEF_FORWARD="${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_MSSFIX
|
|
$IPTABLES -N zone_$1_ACCEPT
|
|
$IPTABLES -N zone_$1_DROP
|
|
$IPTABLES -N zone_$1_REJECT
|
|
$IPTABLES -N zone_$1_forward
|
|
[ "$4" ] && $IPTABLES -A output -j zone_$1_$4
|
|
$IPTABLES -N zone_$1_nat -t nat
|
|
$IPTABLES -N zone_$1_prerouting -t nat
|
|
$IPTABLES -t raw -N zone_$1_notrack
|
|
[ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$1_nat
|
|
[ "$7" == "1" ] && $IPTABLES -I FORWARD 1 -j zone_$1_MSSFIX
|
|
}
|
|
|
|
|
|
addif() {
|
|
local network="$1"
|
|
local ifname="$2"
|
|
local zone="$3"
|
|
|
|
local n_if n_zone
|
|
config_get n_if core "${network}_ifname"
|
|
config_get n_zone core "${network}_zone"
|
|
[ -n "$n_zone" ] && {
|
|
if [ "$n_zone" != "$zone" ]; then
|
|
delif "$network" "$n_if" "$n_zone"
|
|
else
|
|
return
|
|
fi
|
|
}
|
|
|
|
logger "adding $network ($ifname) to firewall zone $zone"
|
|
$IPTABLES -A input -i "$ifname" -j zone_${zone}
|
|
$IPTABLES -I zone_${zone}_MSSFIX 1 -o "$ifname" -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
|
|
$IPTABLES -I zone_${zone}_ACCEPT 1 -o "$ifname" -j ACCEPT
|
|
$IPTABLES -I zone_${zone}_DROP 1 -o "$ifname" -j DROP
|
|
$IPTABLES -I zone_${zone}_REJECT 1 -o "$ifname" -j reject
|
|
$IPTABLES -I zone_${zone}_ACCEPT 1 -i "$ifname" -j ACCEPT
|
|
$IPTABLES -I zone_${zone}_DROP 1 -i "$ifname" -j DROP
|
|
$IPTABLES -I zone_${zone}_REJECT 1 -i "$ifname" -j reject
|
|
$IPTABLES -I zone_${zone}_nat 1 -t nat -o "$ifname" -j MASQUERADE
|
|
$IPTABLES -I PREROUTING 1 -t nat -i "$ifname" -j zone_${zone}_prerouting
|
|
$IPTABLES -A forward -i "$ifname" -j zone_${zone}_forward
|
|
$IPTABLES -t raw -I PREROUTING 1 -i "$ifname" -j zone_${zone}_notrack
|
|
uci_set_state firewall core "${network}_ifname" "$ifname"
|
|
uci_set_state firewall core "${network}_zone" "$zone"
|
|
ACTION=add ZONE="$zone" INTERFACE="$network" DEVICE="$ifname" /sbin/hotplug-call firewall
|
|
}
|
|
|
|
delif() {
|
|
local network="$1"
|
|
local ifname="$2"
|
|
local zone="$3"
|
|
|
|
logger "removing $network ($ifname) from firewall zone $zone"
|
|
$IPTABLES -D input -i "$ifname" -j zone_$zone
|
|
$IPTABLES -D zone_${zone}_MSSFIX -o "$ifname" -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
|
|
$IPTABLES -D zone_${zone}_ACCEPT -o "$ifname" -j ACCEPT
|
|
$IPTABLES -D zone_${zone}_DROP -o "$ifname" -j DROP
|
|
$IPTABLES -D zone_${zone}_REJECT -o "$ifname" -j reject
|
|
$IPTABLES -D zone_${zone}_ACCEPT -i "$ifname" -j ACCEPT
|
|
$IPTABLES -D zone_${zone}_DROP -i "$ifname" -j DROP
|
|
$IPTABLES -D zone_${zone}_REJECT -i "$ifname" -j reject
|
|
$IPTABLES -D zone_${zone}_nat -t nat -o "$ifname" -j MASQUERADE
|
|
$IPTABLES -D PREROUTING -t nat -i "$ifname" -j zone_${zone}_prerouting
|
|
$IPTABLES -D forward -i "$ifname" -j zone_${zone}_forward
|
|
uci_revert_state firewall core "${network}_ifname"
|
|
uci_revert_state firewall core "${network}_zone"
|
|
ACTION=remove ZONE="$zone" INTERFACE="$network" DEVICE="$ifname" /sbin/hotplug-call firewall
|
|
}
|
|
|
|
load_synflood() {
|
|
local rate=${1:-25}
|
|
local burst=${2:-50}
|
|
echo "Loading synflood protection"
|
|
$IPTABLES -N syn_flood
|
|
$IPTABLES -A syn_flood -p tcp --syn -m limit --limit $rate/second --limit-burst $burst -j RETURN
|
|
$IPTABLES -A syn_flood -j DROP
|
|
$IPTABLES -A INPUT -p tcp --syn -j syn_flood
|
|
}
|
|
|
|
fw_set_chain_policy() {
|
|
local chain=$1
|
|
local target=$2
|
|
[ "$target" == "REJECT" ] && {
|
|
$IPTABLES -A $chain -j reject
|
|
target=DROP
|
|
}
|
|
$IPTABLES -P $chain $target
|
|
}
|
|
|
|
fw_clear() {
|
|
$IPTABLES -F
|
|
$IPTABLES -t nat -F
|
|
$IPTABLES -t nat -X
|
|
$IPTABLES -t raw -F
|
|
$IPTABLES -t raw -X
|
|
$IPTABLES -X
|
|
}
|
|
|
|
fw_defaults() {
|
|
[ -n "$DEFAULTS_APPLIED" ] && {
|
|
echo "Error: multiple defaults sections detected"
|
|
return;
|
|
}
|
|
DEFAULTS_APPLIED=1
|
|
|
|
load_policy "$1"
|
|
|
|
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
|
|
|
|
uci_revert_state firewall core
|
|
uci_set_state firewall core "" firewall_state
|
|
|
|
$IPTABLES -P INPUT DROP
|
|
$IPTABLES -P OUTPUT DROP
|
|
$IPTABLES -P FORWARD DROP
|
|
|
|
fw_clear
|
|
config_get_bool drop_invalid $1 drop_invalid 0
|
|
|
|
[ "$drop_invalid" -gt 0 ] && {
|
|
$IPTABLES -A INPUT -m state --state INVALID -j DROP
|
|
$IPTABLES -A OUTPUT -m state --state INVALID -j DROP
|
|
$IPTABLES -A FORWARD -m state --state INVALID -j DROP
|
|
NOTRACK_DISABLED=1
|
|
}
|
|
|
|
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
|
|
$IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
|
|
$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 $1 syn_burst
|
|
[ "$syn_flood" == "1" ] && load_synflood $syn_rate $syn_burst
|
|
|
|
echo "Adding custom chains"
|
|
fw_custom_chains
|
|
|
|
$IPTABLES -N input
|
|
$IPTABLES -N output
|
|
$IPTABLES -N forward
|
|
|
|
$IPTABLES -A INPUT -j input
|
|
$IPTABLES -A OUTPUT -j output
|
|
$IPTABLES -A FORWARD -j forward
|
|
|
|
$IPTABLES -N reject
|
|
$IPTABLES -A reject -p tcp -j REJECT --reject-with tcp-reset
|
|
$IPTABLES -A reject -j REJECT --reject-with icmp-port-unreachable
|
|
|
|
fw_set_chain_policy INPUT "$DEF_INPUT"
|
|
fw_set_chain_policy OUTPUT "$DEF_OUTPUT"
|
|
fw_set_chain_policy FORWARD "$DEF_FORWARD"
|
|
}
|
|
|
|
fw_zone_defaults() {
|
|
local name
|
|
local network
|
|
local masq
|
|
|
|
config_get name $1 name
|
|
config_get network $1 network
|
|
config_get_bool masq $1 masq "0"
|
|
config_get_bool conntrack $1 conntrack "0"
|
|
config_get_bool mtu_fix $1 mtu_fix 0
|
|
|
|
load_policy $1
|
|
[ "$forward" ] && $IPTABLES -A zone_${name}_forward -j zone_${name}_${forward}
|
|
[ "$input" ] && $IPTABLES -A zone_${name} -j zone_${name}_${input}
|
|
}
|
|
|
|
fw_zone() {
|
|
local name
|
|
local network
|
|
local masq
|
|
|
|
config_get name $1 name
|
|
config_get network $1 network
|
|
config_get_bool masq $1 masq "0"
|
|
config_get_bool conntrack $1 conntrack "0"
|
|
config_get_bool mtu_fix $1 mtu_fix 0
|
|
|
|
load_policy $1
|
|
[ "$conntrack" = "1" -o "$masq" = "1" ] && append CONNTRACK_ZONES "$name"
|
|
[ -z "$network" ] && network=$name
|
|
create_zone "$name" "$network" "$input" "$output" "$forward" "$masq" "$mtu_fix"
|
|
fw_custom_chains_zone "$name"
|
|
}
|
|
|
|
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 icmp_type
|
|
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 icmp_type $1 icmp_type
|
|
config_get target $1 target
|
|
config_get ruleset $1 ruleset
|
|
|
|
src_port_first=${src_port%-*}
|
|
src_port_last=${src_port#*-}
|
|
[ "$src_port_first" -ne "$src_port_last" ] && { \
|
|
src_port="$src_port_first:$src_port_last"; }
|
|
|
|
dest_port_first=${dest_port%-*}
|
|
dest_port_last=${dest_port#*-}
|
|
[ "$dest_port_first" -ne "$dest_port_last" ] && { \
|
|
dest_port="$dest_port_first:$dest_port_last"; }
|
|
|
|
ZONE=input
|
|
TARGET=$target
|
|
[ -z "$target" ] && target=DROP
|
|
[ -n "$src" -a -z "$dest" ] && ZONE=zone_$src
|
|
[ -n "$src" -a -n "$dest" ] && ZONE=zone_${src}_forward
|
|
[ -n "$dest" ] && TARGET=zone_${dest}_$target
|
|
|
|
eval 'RULE_COUNT=$((++RULE_COUNT_'$ZONE'))'
|
|
|
|
add_rule() {
|
|
$IPTABLES -I $ZONE $RULE_COUNT \
|
|
${proto:+-p $proto} \
|
|
${icmp_type:+--icmp-type $icmp_type} \
|
|
${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 $TARGET
|
|
}
|
|
[ "$proto" == "tcpudp" -o -z "$proto" ] && {
|
|
proto=tcp
|
|
add_rule
|
|
proto=udp
|
|
add_rule
|
|
return
|
|
}
|
|
add_rule
|
|
}
|
|
|
|
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 $z_dest
|
|
|
|
# propagate masq zone flag
|
|
find_item "$src" $CONNTRACK_ZONES && append CONNTRACK_ZONES $dest
|
|
find_item "$dest" $CONNTRACK_ZONES && append CONNTRACK_ZONES $src
|
|
}
|
|
|
|
fw_redirect() {
|
|
local src
|
|
local src_ip
|
|
local src_port
|
|
local src_dport
|
|
local src_mac
|
|
local dest_ip
|
|
local dest_port dest_port2
|
|
local proto
|
|
|
|
config_get src $1 src
|
|
config_get src_ip $1 src_ip
|
|
config_get src_dip $1 src_dip
|
|
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 proto $1 proto
|
|
[ -z "$src" -o -z "$dest_ip" ] && { \
|
|
echo "redirect needs src and dest_ip"; return ; }
|
|
|
|
src_port_first=${src_port%-*}
|
|
src_port_last=${src_port#*-}
|
|
[ "$src_port_first" != "$src_port_last" ] && { \
|
|
src_port="$src_port_first:$src_port_last"; }
|
|
|
|
src_dport_first=${src_dport%-*}
|
|
src_dport_last=${src_dport#*-}
|
|
[ "$src_dport_first" != "$src_dport_last" ] && { \
|
|
src_dport="$src_dport_first:$src_dport_last"; }
|
|
|
|
dest_port2=${dest_port:-$src_dport}
|
|
dest_port_first=${dest_port2%-*}
|
|
dest_port_last=${dest_port2#*-}
|
|
[ "$dest_port_first" != "$dest_port_last" ] && { \
|
|
dest_port2="$dest_port_first:$dest_port_last"; }
|
|
|
|
add_rule() {
|
|
$IPTABLES -A zone_${src}_prerouting -t nat \
|
|
${proto:+-p $proto} \
|
|
${src_ip:+-s $src_ip} \
|
|
${src_dip:+-d $src_dip} \
|
|
${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 \
|
|
${proto:+-p $proto} \
|
|
-d $dest_ip \
|
|
${src_ip:+-s $src_ip} \
|
|
${src_port:+--sport $src_port} \
|
|
${dest_port2:+--dport $dest_port2} \
|
|
${src_mac:+-m mac --mac-source $src_mac} \
|
|
-j ACCEPT
|
|
}
|
|
[ "$proto" == "tcpudp" -o -z "$proto" ] && {
|
|
proto=tcp
|
|
add_rule
|
|
proto=udp
|
|
add_rule
|
|
return
|
|
}
|
|
add_rule
|
|
}
|
|
|
|
fw_include() {
|
|
local path
|
|
config_get path $1 path
|
|
[ -e $path ] && . $path
|
|
}
|
|
|
|
get_interface_zones() {
|
|
local interface="$2"
|
|
local name
|
|
local network
|
|
config_get name $1 name
|
|
config_get network $1 network
|
|
[ -z "$network" ] && network=$name
|
|
for n in $network; do
|
|
[ "$n" = "$interface" ] && append add_zone "$name"
|
|
done
|
|
}
|
|
|
|
fw_event() {
|
|
local action="$1"
|
|
local interface="$2"
|
|
local ifname="$(sh -c ". /etc/functions.sh; include /lib/network; scan_interfaces; config_get "$interface" ifname")"
|
|
add_zone=
|
|
local up
|
|
|
|
[ -z "$ifname" ] && return 0
|
|
config_foreach get_interface_zones zone "$interface"
|
|
[ -z "$add_zone" ] && return 0
|
|
|
|
case "$action" in
|
|
ifup)
|
|
for z in $add_zone; do
|
|
local loaded
|
|
config_get loaded core loaded
|
|
[ -n "$loaded" ] && addif "$interface" "$ifname" "$z"
|
|
done
|
|
;;
|
|
ifdown)
|
|
config_get up "$interface" up
|
|
|
|
for z in $ZONE; do
|
|
[ "$up" == "1" ] && delif "$interface" "$ifname" "$z"
|
|
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
|
|
}
|