Gentoo IPTables Xtables-addons Block countries

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WHY

Because there are kinda' tons of infected japan and pakistan computers which try to send spam to me ( or use me as a relay ). My postfix is set up to block relay but that still has to check against dnsbl lists for each ip.

HOW

Use geoip with iptables !

I'm using gentoo so patch-o-matic doesn't seem to be integrated yet.

Step 1. Get the latest xtables-addons from http://xtables-addons.sourceforge.net/ and unpack

Step 2. Go to your unpacked xtables-addons dir and do

./configure --with-xtlibdir=/lib/xtables # this is where my gentoo puts his modules
make
make install

On my arm gentoo boxen I have this package masked which is needed for the next steps...

echo "dev-perl/Text-CSV_XS **" >> /etc/portage/package.keywords
emerge Text-CSV_XS

Step 3. Get the ip->country database and set it up right.

mkdir ~/geoip
cd ~/geoip
wget http://geolite.maxmind.com/download/geoip/database/GeoIPCountryCSV.zip
unzip GeoIPCountryCSV.zip
wget http://jengelh.medozas.de/files/geoip/geoip_src.tar.bz2
tar -xjf geoip_src.tar.bz2 geoip_csv_iv0.pl runme.sh
cp -r var/geoip/* /var/geoip/

runme.sh's contents:

#!/bin/bash -ex

rm -Rf var
mkdir -p var/geoip/{BE,LE};
pushd var/geoip/BE;
../../../geoip_csv_iv0.pl -b ../../../GeoIPCountryWhois.csv;
popd;
pushd var/geoip/LE;
../../../geoip_csv_iv0.pl ../../../GeoIPCountryWhois.csv;
popd;
find var -print0 | sort -z | tar -T- --null --no-r --owner=root \
        --group=root -cvjf geoip_iv0_database.tar.bz2;
tar --no-r --owner=root --group=root -cvjf geoip_src.tar.bz2 \
        GeoIPCountryWhois.csv geoip_csv_iv0.pl runme.sh

geoip_csv_iv0.pl's contents:

#!/usr/bin/perl
#
#       Converter for MaxMind CSV database to binary, for xt_geoip
#       Copyright © CC Computer Consultants, 2008
#
#       Contact: Jan Engelhardt <jengelh@computergmbh.de>
#
#       Use -b argument to create big-endian tables.
#
use Getopt::Long;
use IO::Handle;
use Text::CSV_XS; # or trade for Text::CSV
use strict;

my %country;
my %names;
my $csv = Text::CSV_XS->new({binary => 0, eol => $/}); # or Text::CSV
my $mode = "VV";

&Getopt::Long::Configure(qw(bundling));
&GetOptions("b" => sub { $mode = "NN"; });

while (my $row = $csv->getline(*ARGV)) {
        if (!defined($country{$row->[4]})) {
                $country{$row->[4]} = [];
                $names{$row->[4]} = $row->[5];
        }
        my $c = $country{$row->[4]};
        push(@$c, [$row->[2], $row->[3]]);
        if ($. % 4096 == 0) {
                print STDERR "\r\e[2K$. entries";
        }
}

print STDERR "\r\e[2K$. entries total\n";

foreach my $iso_code (sort keys %country) {
        printf "%5u ranges for %s %s\n",
                scalar(@{$country{$iso_code}}),
                $iso_code, $names{$iso_code};

        open(my $fh, ">".uc($iso_code).".iv0");
        foreach my $range (@{$country{$iso_code}}) {
                print $fh pack($mode, $range->[0], $range->[1]);
        }
        close $fh;
}

And you're done