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() {
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
+ $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
}
addif() {
- local dev
- config_get dev core $2
- [ -n "$dev" -a "$dev" != "$1" ] && delif "$dev" "$2"
- [ -n "$dev" -a "$dev" == "$1" ] && return
- 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
- uci_set_state firewall core "$2" "$1"
+ 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"
}
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
- uci_revert_state firewall core "$2"
+ 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 "${network}_zone"
}
load_synflood() {
+ local rate=${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
uci_revert_state firewall core
uci_set_state firewall core "" firewall_state
- $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 -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 -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() {
config_get name $1 name
config_get network $1 network
- config_get masq $1 masq
- load_policy $1
+ config_get_bool masq $1 masq "0"
+ config_get_bool conntrack $1 conntrack "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"
+ fw_custom_chains_zone "$name"
}
fw_rule() {
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=$target
+ [ -n "$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 -I $ZONE 1 \
${proto:+-p $proto} \
config_get src $1 src
config_get dest $1 dest
- [ -n "$src" ] && z_src=zone_${src}_forward || z_src=FORWARD
+ config_get_bool mtu_fix $1 mtu_fix 0
+ [ -n "$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 $z_dest
+ [ "$mtu_fix" -gt 0 -a -n "$dest" ] && $IPTABLES -I $z_src 1 -j zone_${dest}_MSSFIX
+
+ # propagate masq zone flag
+ find_item "$src" $CONNTRACK_ZONES && append CONNTRACK_ZONES $dest
+ find_item "$dest" $CONNTRACK_ZONES && append CONNTRACK_ZONES $src
}
fw_redirect() {
[ "$src_dport_first" -ne "$src_dport_last" ] && { \
src_dport="$src_dport_first:$src_dport_last"; }
- destport2=destport
+ dest_port2=$dest_port
dest_port_first=${dest_port2%-*}
dest_port_last=${dest_port2#*-}
[ "$dest_port_first" -ne "$dest_port_last" ] && { \
}
fw_custom_chains() {
+ [ -n "$CUSTOM_CHAINS" ] || return 0
$IPTABLES -N input_rule
$IPTABLES -N output_rule
- $IPTABLES -N forward_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 forward_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 "Adding custom chains"
- fw_custom_chains
+ echo "Loading rules"
+ config_foreach fw_rule rule
echo "Loading includes"
config_foreach fw_include include
uci_set_state firewall core loaded 1
+ config_foreach fw_check_notrack zone
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
+ fw_clear
$IPTABLES -P INPUT ACCEPT
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -P FORWARD ACCEPT
- uci_revert_state firewall core
+ uci_revert_state firewall
}
projects / openwrt.git / blobdiff