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-rwxr-xr-xpackage/firewall/files/firewall.config10
-rwxr-xr-xpackage/firewall/files/uci_firewall.sh80
2 files changed, 57 insertions, 33 deletions
diff --git a/package/firewall/files/firewall.config b/package/firewall/files/firewall.config
index fe5d38d2b9..8ac9049553 100755
--- a/package/firewall/files/firewall.config
+++ b/package/firewall/files/firewall.config
@@ -1,20 +1,20 @@
config defaults
option syn_flood 1
- option input DROP
+ option input REJECT
option output ACCEPT
- option forward DROP
+ option forward REJECT
config zone
option name lan
option input ACCEPT
option output ACCEPT
- option forward DROP
+ option forward REJECT
config zone
option name wan
- option input DROP
+ option input REJECT
option output ACCEPT
- option forward DROP
+ option forward REJECT
option masq 1
config forwarding
diff --git a/package/firewall/files/uci_firewall.sh b/package/firewall/files/uci_firewall.sh
index 22731af98e..884b596391 100755
--- a/package/firewall/files/uci_firewall.sh
+++ b/package/firewall/files/uci_firewall.sh
@@ -46,7 +46,7 @@ create_zone() {
$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_$1_nat
@@ -58,43 +58,52 @@ addif() {
[ -n "$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 -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_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_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
+ $IPTABLES -A forward -i $1 -j zone_$2_forward
uci_set_state firewall core "$2" "$1"
}
delif() {
logger "removing $1 from firewall zone $2"
- $IPTABLES -D INPUT -i $1 -j 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_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_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
+ $IPTABLES -D forward -i $1 -j zone_$2_forward
uci_revert_state firewall core "$2"
}
load_synflood() {
+ local rate=${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_defaults() {
@@ -116,21 +125,23 @@ fw_defaults() {
uci_revert_state firewall core
uci_set_state firewall core "" firewall_state
+ $IPTABLES -P INPUT DROP
+ $IPTABLES -P OUTPUT DROP
+ $IPTABLES -P FORWARD DROP
+
$IPTABLES -F
- $IPTABLES -t nat -F
$IPTABLES -t mangle -F
- $IPTABLES -X -t nat
+ $IPTABLES -t nat -F
+ $IPTABLES -t mangle -X
+ $IPTABLES -t nat -X
$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
@@ -141,10 +152,19 @@ fw_defaults() {
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
+
+ $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_zone() {
@@ -186,7 +206,7 @@ fw_rule() {
config_get ruleset $1 ruleset
[ -z "$target" ] && target=DROP
- [ -n "$src" ] && ZONE=zone_$src || ZONE=INPUT
+ [ -n "$src" ] && ZONE=zone_$src || ZONE=input
[ -n "$dest" ] && TARGET=zone_${dest}_$target || TARGET=$target
add_rule() {
$IPTABLES -I $ZONE 1 \
@@ -215,7 +235,7 @@ 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
}
@@ -339,13 +359,17 @@ fw_init() {
unset CONFIG_APPEND
config_load network
config_foreach fw_addif interface
+ fw_set_chain_policy INPUT $input
+ fw_set_chain_policy OUTPUT $output
+ fw_set_chain_policy FORWARD $forward
}
fw_stop() {
$IPTABLES -F
- $IPTABLES -t nat -F
$IPTABLES -t mangle -F
- $IPTABLES -X -t nat
+ $IPTABLES -t nat -F
+ $IPTABLES -t mangle -X
+ $IPTABLES -t nat -X
$IPTABLES -X
$IPTABLES -P INPUT ACCEPT
$IPTABLES -P OUTPUT ACCEPT
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 11:31:26 +0000