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firewall: fix default policies, add a check for duplicate defaults sections and make custom chains more generic 

SVN-Revision: 12765
This commit is contained in:
Felix Fietkau 2008-09-28 16:17:37 +00:00
parent d896035377
commit 13abdc0af1
1 changed files with 34 additions and 18 deletions
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52
package/firewall/files/uci_firewall.sh
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@ -16,6 +16,7 @@ config_load firewall
config fw_zones
ZONE_LIST=$CONFIG_SECTION
CUSTOM_CHAINS=1
DEF_INPUT=DROP
DEF_OUTPUT=DROP
DEF_FORWARD=DROP
@ -25,9 +26,9 @@ load_policy() {
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() {
@ -107,10 +108,13 @@ fw_set_chain_policy() {
}
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
@ -165,6 +169,13 @@ fw_defaults() {
$IPTABLES -N reject
$IPTABLES -A reject -p tcp -j REJECT --reject-with tcp-reset
$IPTABLES -A reject -j REJECT --reject-with icmp-port-unreachable
echo "Adding custom chains"
fw_custom_chains
fw_set_chain_policy INPUT "$DEF_INPUT"
fw_set_chain_policy OUTPUT "$DEF_OUTPUT"
fw_set_chain_policy FORWARD "$DEF_FORWARD"
}
fw_zone() {
@ -179,6 +190,7 @@ fw_zone() {
[ -z "$network" ] && network=$name
create_zone "$name" "$network" "$input" "$output" "$forward" "$masq"
fw_custom_chains_zone "$name"
}
fw_rule() {
@ -321,26 +333,35 @@ fw_addif() {
}
fw_custom_chains() {
[ -n "$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 -N input_wan
$IPTABLES -N forwarding_wan
$IPTABLES -N prerouting_wan -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
$IPTABLES -A zone_wan -j input_wan
$IPTABLES -A zone_wan_forward -j forwarding_wan
$IPTABLES -A zone_wan_prerouting -t nat -j prerouting_wan
}
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
$IPTABLES -A zone_${zone} -j input_${zone}
$IPTABLES -A zone_${zone}_forward -j forwarding_${zone}
$IPTABLES -A zone_${zone}_prerouting -t nat -j prerouting_${zone}
}
fw_init() {
DEFAULTS_APPLIED=
echo "Loading defaults"
config_foreach fw_defaults defaults
echo "Loading zones"
@ -351,17 +372,12 @@ fw_init() {
config_foreach fw_forwarding forwarding
echo "Loading redirects"
config_foreach fw_redirect redirect
echo "Adding custom chains"
fw_custom_chains
echo "Loading includes"
config_foreach fw_include include
uci_set_state firewall core loaded 1
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() {