script x IPTABLES

[NZ]

ho ritrovato un vecchio script x IPTABLES che usavo prima di avere un router con firewall integrato.
Ecco lo script:

#!/bin/sh
#
# Script Firewall for IP-tables
#

IPT=/usr/sbin/iptables


# SET-UP POLICY CATENE PRINCIPALI

$IPT -t filter -P INPUT DROP
$IPT -t filter -P OUTPUT ACCEPT
$IPT -t filter -P FORWARD DROP
$IPT -t filter -F
$IPT -t filter -X


# CREAZIONE DI 5 NUOVE CATENE AUSILIARIE

$IPT -t filter -N ppp_in
$IPT -t filter -N syn_flood
$IPT -t filter -N check_in
$IPT -t filter -N ip_halt


# REGOLE DELLA CATENA DI INPUT

$IPT -t filter -A INPUT -s 224.0.0.0/8 -j DROP
$IPT -t filter -A INPUT -i lo -j ACCEPT
$IPT -t filter -A INPUT -i ! lo -d 127.0.0.0/8 -j DROP
$IPT -t filter -A INPUT -i ppp0 -j ppp_in
$IPT -t filter -A INPUT -j DROP


# REGOLE DELLA CATENA DI SYN_FLOOD

$IPT -t filter -A syn_flood -m limit --limit 1/s --limit-burst 4 -j RETURN
$IPT -t filter -A syn_flood -j DROP


# REGOLE DELLA CATENA DI IP_HALT

$IPT -t filter -A ip_halt -s 4.43.108.0/24 -j DROP
$IPT -t filter -A ip_halt -s 4.67.43.0/24 -j DROP
$IPT -t filter -A ip_halt -s 65.215.219.0/24 -j DROP
$IPT -t filter -A ip_halt -s 12.5.248.128/25 -j DROP
$IPT -t filter -A ip_halt -s 151.12.58.0/24 -j DROP
$IPT -t filter -A ip_halt -s 193.43.80.0/21 -j DROP
$IPT -t filter -A ip_halt -s 193.43.106.0/23 -j DROP
$IPT -t filter -A ip_halt -s 193.43.108.0/24 -j DROP
$IPT -t filter -A ip_halt -s 195.120.182.0/24 -j DROP
$IPT -t filter -A ip_halt -s 151.12.60.64/27 -j DROP
$IPT -t filter -A ip_halt -s 151.99.156.160/27 -j DROP
$IPT -t filter -A ip_halt -s 151.99.187.248/29 -j DROP
$IPT -t filter -A ip_halt -s 193.42.1.0/24 -j DROP
$IPT -t filter -A ip_halt -s 194.177.114.208/28 -j DROP
$IPT -t filter -A ip_halt -s 195.223.222.200/29 -j DROP
$IPT -t filter -A ip_halt -s 208.209.2.110/31 -j DROP
$IPT -t filter -A ip_halt -s 208.209.2.112/31 -j DROP
$IPT -t filter -A ip_halt -s 217.228.123.45 -j DROP
$IPT -t filter -A ip_halt -s 64.241.31.0/24 -j DROP
$IPT -t filter -A ip_halt -j RETURN


# REGOLE CATENA DI CHECK_IN

$IPT -t filter -A check_in -p tcp --dport 0:1023 -j DROP
$IPT -t filter -A check_in -p udp --dport 0:1023 -j DROP
$IPT -t filter -A check_in -p tcp --dport 6000:6063 -j DROP
$IPT -t filter -A check_in -p udp --dport 6000:6063 -j DROP
$IPT -t filter -A check_in -p tcp --dport 10000 -j DROP
$IPT -t filter -A check_in -p tcp --dport 32768 -j DROP
$IPT -t filter -A check_in -p udp --dport 32768 -j DROP
$IPT -t filter -A check_in -j RETURN


# REGOLE CATENA PPP_IN

$IPT -t filter -A ppp_in -s 192.168.0.0/24 -j DROP
$IPT -t filter -A ppp_in -d 192.168.0.0/24 -j DROP
$IPT -t filter -A ppp_in -s 127.0.0.0/8 -j DROP
$IPT -t filter -A ppp_in -d 127.0.0.0/8 -j DROP
$IPT -t filter -A ppp_in -d 224.0.0.0/4 -j DROP
$IPT -t filter -A ppp_in -m state --state INVALID -j DROP
$IPT -t filter -A ppp_in -j ip_halt
$IPT -t filter -A ppp_in -p tcp --syn -j syn_flood
$IPT -t filter -A ppp_in -j check_in
$IPT -t filter -A ppp_in -p tcp -m tcp --dport 31831 -j ACCEPT  # ed2k
$IPT -t filter -A ppp_in -p udp -m udp --dport 43602 -j ACCEPT  # ed2k
$IPT -t filter -A ppp_in -p tcp -m tcp --dport 43467 -j ACCEPT # torrent
$IPT -t filter -A ppp_in -m state --state RELATED,ESTABLISHED -j ACCEPT
$IPT -t filter -A ppp_in -j DROP


# REGOLE DELLA CATENA DI OUTPUT

$IPT -t filter -A OUTPUT -p tcp -m tcp --dport 135:139 -j DROP
$IPT -t filter -A OUTPUT -p tcp -m tcp --dport 445 -j DROP
$IPT -t filter -A OUTPUT -p tcp -m tcp --sport 135:139 -j DROP
$IPT -t filter -A OUTPUT -p tcp -m tcp --sport 445 -j DROP


# IMPORTANTE!
#
# Gli IP bloccati dalla catena ip_halt sono i seguenti:
# Le liste degli IP da bloccare possono essere scaricate da:
# http://xs.tech.nu/
# Una volta ottenuta la lista,e salvatala in un file.txt,è possibile
# convertirla in comandi iptables utilizzando il tool presente su:
# http://www.bluetack.co.uk

vorrei riutilizzare questo script ma adesso non uso più un model 56k (e relativa interfaccia ppp0) ma un router con IP=192.168.0.1 e la mia linux_box ha IP=192.168.0.2 (il DHCP è diabilitato!)

Come modifico la seguente riga??
$IPT -t filter -A INPUT -i ppp0 -j ppp_in

anzichè -i ppp0 ho provato con -i eth0 oppure -S 192.168.0.1 ma non funziona nulla nel senso che non navigo più

Suggerimenti?

grazie mille

[Shang Tsung]

A prescindere dal fatto che se ora hai un router non so che senso abbia chiudere le porte sulla tua linux box collegata dietro al router se nel router stesso chiudi le porte e non fai del port forwarding

va bene se ci metti eth0 al posto di ppp0 (se eth0 è quella attaccata al router) ma poi questa parte del firewall:

# REGOLE CATENA PPP_IN

$IPT -t filter -A ppp_in -s 192.168.0.0/24 -j DROP
$IPT -t filter -A ppp_in -d 192.168.0.0/24 -j DROP

non va bene se come dici hai un router con IP=192.168.0.1 e la linux_box IP=192.168.0.2