-#!/bin/sh
+#!/bin/sh
# Copyright (C) 2008 John Crispin <blogic@openwrt.org>
. /etc/functions.sh
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 $1 forward
- [ -z "$input" ] && input=$DEF_INPUT
- [ -z "$output" ] && output=$DEF_OUTPUT
- [ -z "$forward" ] && forward=$DEF_FORWARD
+ DEF_INPUT="${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
+ 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
- $IPTABLES -A zone_$1_forward -j zone_$1_$5
- $IPTABLES -A zone_$1 -j zone_$1_$3
- $IPTABLES -A OUTPUT -j zone_$1_$4
+ [ "$4" ] && $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
+ $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() {
- 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
+ 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() {
- 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
+ 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 ${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
+ $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() {
- load_policy $1
- DEF_INPUT=$input
- DEF_OUTPUT=$output
- DEF_FORWARD=$forward
+ [ -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
+ 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
+ for f in /proc/sys/net/ipv4/conf/*/accept_source_route
do
echo 0 > $f
- done
+ 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 -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
+
+ 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() {
+fw_zone_defaults() {
local name
local network
local masq
config_get name $1 name
config_get network $1 network
- config_get masq $1 masq
+ 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"
+ create_zone "$name" "$network" "$input" "$output" "$forward" "$masq" "$mtu_fix"
+ fw_custom_chains_zone "$name"
}
fw_rule() {
- local src
+ local src
local src_ip
local src_mac
local src_port
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 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" ] && 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 $TARGET
+ [ -n "$src" -a -z "$dest" ] && ZONE=zone_$src
+ [ -n "$src" -a -n "$dest" ] && ZONE=zone_${src}_forward
+ [ -n "$dest" ] && TARGET=zone_${dest}_$target
+ add_rule() {
+ $IPTABLES -A $ZONE \
+ ${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() {
config_get src $1 src
config_get dest $1 dest
- [ -n "$src" ] && z_src=zone_${src}_forward || z_src=FORWARD
+ [ -n "$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_dport
local src_mac
local dest_ip
- local dest_port
- local protocol
-
+ local dest_port dest_port2
+ local proto
+
config_get src $1 src
config_get src_ip $1 src_ip
config_get src_port $1 src_port
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
+ config_get proto $1 proto
[ -z "$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 $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 $src_mac} \
- -j ACCEPT
+
+ src_port_first=${src_port%-*}
+ src_port_last=${src_port#*-}
+ [ "$src_port_first" -ne "$src_port_last" ] && { \
+ src_port="$src_port_first:$src_port_last"; }
+
+ src_dport_first=${src_dport%-*}
+ src_dport_last=${src_dport#*-}
+ [ "$src_dport_first" -ne "$src_dport_last" ] && { \
+ src_dport="$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" -ne "$dest_port_last" ] && { \
+ dest_port2="$dest_port_first:$dest_port_last"; }
+
+ add_rule() {
+ $IPTABLES -A zone_${src}_prerouting -t nat \
+ ${proto:+-p $proto} \
+ ${src_ip:+-s $src_ip} \
+ ${src_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() {
[ -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
- config_get ifname $1 ifname
[ -n "$up" ] || return 0
- (ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall)
+ 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 rules"
- config_foreach fw_rule rule
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
-
- uci_set_state firewall core "" firewall_state
+ echo "Loading zone defaults"
+ config_foreach fw_zone_defaults zone
uci_set_state firewall core loaded 1
- unset CONFIG_APPEND
- config_load network
- config_foreach fw_addif interface
+ config_set core loaded 1
+ config_foreach fw_check_notrack zone
+ INTERFACES="$(sh -c '. /etc/functions.sh; config_load network; config_foreach echo interface')"
+ for interface in $INTERFACES; do
+ fw_addif "$interface"
+ done
}
fw_stop() {
- $IPTABLES -F
- $IPTABLES -t nat -F
- $IPTABLES -t mangle -F
- $IPTABLES -X -t nat
- $IPTABLES -X
+ fw_clear
$IPTABLES -P INPUT ACCEPT
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -P FORWARD ACCEPT
+ uci_revert_state firewall
}
projects / openwrt.git / blobdiff