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firewall changes:

Browse Source 
- implement a REJECT policy and enable it by default, reject packets with approriate response (closes: #3970)
 - cleanup syn_flood and remove logging


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12688 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nico
2008-09-24 15:10:16 +00:00
parent ac9e683f8a
commit 1fa1f8e7d8
2 changed files with 57 additions and 33 deletions
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80
package/firewall/files/uci_firewall.sh
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@@ -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