contrib/package: add freifunk-p2pblock firewall addon

1 files changed, 89 insertions, 0 deletions

diff --git a/contrib/package/freifunk-p2pblock/files/freifunk-p2pblock.init b/contrib/package/freifunk-p2pblock/files/freifunk-p2pblock.init
new file mode 100644
index 000000000..95193aa62
--- /dev/null
+++ b/contrib/package/freifunk-p2pblock/files/freifunk-p2pblock.init
@@ -0,0 +1,89 @@
+#!/bin/sh /etc/rc.common
+
+START=82
+ME="freifunk-p2pblock"
+LOCK='/var/run/p2pblock.lock'
+
+# helper-scripts
+ipt_add() {
+	logger -t "$ME" "set 'iptables -I $1'"
+	iptables -I $1
+	echo "iptables -D $1" >> $LOCK
+}
+
+start() {
+	if [ ! -s "$LOCK" ]; then
+		logger -s -t "$ME" 'starting p2pblock...'
+		
+		config_load network
+		config_get wan wan ifname
+		config_load freifunk-p2pblock
+		config_get layer7 p2pblock layer7
+		config_get ipp2p p2pblock ipp2p
+		config_get portrange p2pblock portrange
+		config_get blocktime p2pblock blocktime
+
+		# load modules
+		insmod ipt_ipp2p 2>&-
+		insmod ipt_layer7 2>&-
+		insmod ipt_recent ip_list_tot=400 ip_pkt_list_tot=3 2>&-
+
+		# create new p2p-chain
+		iptables -N p2pblock
+		# pipe all incomming FORWARD with source-/destination-port 1024-65535 throu p2p-chain 
+		ipt_add "FORWARD -i $wan -p tcp --sport $portrange --dport $portrange -j p2pblock"
+		ipt_add "FORWARD -i $wan -p udp --sport $portrange --dport $portrange -j p2pblock"
+
+		# if p2p-traffic blocked 3 packages to a destination ip then block all traffic within the next 180 sec (port 1024-65535)
+		ipt_add "p2pblock -m recent --rdest --rcheck --name P2PBLOCK --seconds $blocktime --hitcount 3 -j DROP"
+		ipt_add "p2pblock -m recent --rdest --rcheck --name P2PBLOCK --seconds $blocktime --hitcount 3 -m limit --limit 1/minute -j LOG --log-prefix P2PBLOCK-DROP:"
+
+		# create layer7-rules
+		for proto in $layer7; do
+			ipt_add "p2pblock -m layer7 --l7proto $proto -m recent --rdest --set --name P2PBLOCK"
+			ipt_add "p2pblock -m layer7 --l7proto $proto -m limit --limit 1/minute -j LOG --log-prefix P2PBLOCK-seen-$proto:"
+		done
+
+		# create ipp2p-rules
+		for proto in $ipp2p; do
+			ipt_add "p2pblock -m ipp2p --$proto -m recent --rdest --set --name P2PBLOCK"
+			ipt_add "p2pblock -m ipp2p --$proto -m limit --limit 1/minute -j LOG --log-prefix P2PBLOCK-seen-$proto:"
+		done
+
+		# insert whitelisted ips
+		for ip in $WHITELIST; do
+			ipt_add "p2pblock -d $ip -j RETURN"
+		done
+
+		logger -s -t "$ME" 'Done.'; return 0
+
+	else
+		logger -s -t "$ME" 'WARNING! already running - Aborting!'; return 2
+
+	fi
+}
+
+stop() {
+	if [ -s "$LOCK" ]; then
+		logger -s -t "$ME" 'stopping p2pblock...'
+
+		# unset all rules in $LOCK-file
+		cat $LOCK | sed -ne '1!G;h;$p' | while read line; do
+			logger -t "$ME" "unset $line"
+			while eval $line 2>&-; do :; done
+		done; : > "$LOCK"
+
+		# flush and delete the p2p-chain
+		iptables -F p2pblock
+		iptables -X p2pblock
+		logger -s -t "$ME" 'Done.'; return 0
+
+	else
+		logger -s -t "$ME" 'WARNING! not running - Aborting!'; return 2
+
+	fi
+}
+
+restart() {
+	stop; sleep 1; start
+}