postfix 와 ssh 로 거의 수초간격으로 엉터리 비번으로 계속 접속시도하는데

fail2ban 으로 막는것도 한계가 있고

내 메일서버로 무슨 구멍인지 스팸메일 보내기까지 성공한다. 

 

아래는 모든 IP, 포트를 차단한후  허용된 국내IP, 허용된 포트만 오픈하는 방식이다.

 

해외 IP는 http, https를 제외한 모든 서비스 다 차단하고나니 auth.log와 mail.log가 조용하다.

 

진작 할 걸..

 

1.  GeoLite2 Free Downloadable Databases

 

https://dev.maxmind.com/geoip/geoip2/geolite2/

 

위 사이트에서 GeoLite2 City csv 포맷 다운로드

 

mkdir /root/geoip
cd /root/geoip
wget https://geolite.maxmind.com/download/geoip/database/GeoLite2-City-CSV.zip
unzip GeoLite2-City-CSV.zip
ln -s GeoLite2-City-CSV_20190611 GeoLite2-City-CSV_current

 

 

 

2. mysql 에 넣기

 

vi db-setup.sql

 

USE geoip;
DROP TABLE IF EXISTS ip_blocks; 


CREATE TABLE `ip_blocks` (

`ip_from` int unsigned NOT NULL,
`ip_to` int unsigned NOT NULL,

  `network` varchar(32) NOT NULL,
  `geoname_id` int unsigned NOT NULL,
  `registered_country_geoname_id` int unsigned NOT NULL,
  `represented_country_geoname_id` int unsigned NOT NULL,
  `is_anonymous_proxy` tinyint(1) NOT NULL,
  `is_satellite_provider` tinyint(1) NOT NULL,
  `postal_code` varchar(32) NOT NULL,
  `latitude` float(8,4) NOT NULL,
  `longitude` float(8,4) NOT NULL,
  `accuracy_radius` smallint unsigned NOT NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
 
ALTER TABLE `ip_blocks` ADD PRIMARY KEY `ip_to` (`ip_to`);

DROP TABLE IF EXISTS ip_locations; 
 
CREATE TABLE `ip_locations` (
  `geoname_id` int unsigned NOT NULL,
  `locale_code` varchar(32) NOT NULL,
  `continent_code` char(2) NOT NULL,
  `continent_name` varchar(32) NOT NULL,
  `country_iso_code` char(2) NOT NULL,
  `country_name` varchar(64) NOT NULL,
  `subdivision_1_iso_code` varchar(3) NOT NULL,
  `subdivision_1_name` varchar(128) COLLATE 'utf8_unicode_ci' NOT NULL,
  `subdivision_2_iso_code` varchar(3) NOT NULL,
  `subdivision_2_name` varchar(128) COLLATE 'utf8_unicode_ci' NOT NULL,
  `city_name` varchar(128) COLLATE 'utf8_unicode_ci' NOT NULL,
  `metro_code` smallint unsigned NOT NULL,
  `time_zone` varchar(64) NOT NULL,
  `is_in_european_union` tinyint(1) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

ALTER TABLE `ip_locations` ADD PRIMARY KEY `geoname_id` (`geoname_id`);


LOAD DATA LOCAL INFILE '/root/geoip/GeoLite2-City-CSV_current/GeoLite2-City-Blocks-IPv4.csv' INTO TABLE ip_blocks COLUMNS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' IGNORE 1 LINES (
network,
geoname_id,
registered_country_geoname_id,
represented_country_geoname_id,
is_anonymous_proxy,
is_satellite_provider,
postal_code,
latitude,
longitude,
accuracy_radius) SET 
ip_from = INET_ATON(SUBSTRING(network, 1, LOCATE('/', network) - 1)),
ip_to = (INET_ATON(SUBSTRING(network, 1, LOCATE('/', network) - 1)) + (pow(2, (32-CONVERT(SUBSTRING(network, LOCATE('/', network) + 1), UNSIGNED INTEGER)))-1));


LOAD DATA LOCAL INFILE '/root/geoip/GeoLite2-City-CSV_current/GeoLite2-City-Locations-en.csv' INTO TABLE ip_locations CHARACTER SET UTF8 COLUMNS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' IGNORE 1 LINES (
geoname_id,
locale_code,
continent_code,
continent_name,
country_iso_code,
country_name,
subdivision_1_iso_code,
subdivision_1_name,
subdivision_2_iso_code,
subdivision_2_name,
city_name,
metro_code,
time_zone,
is_in_european_union);

 

mysql에  import하기

 

mysql -u사용자 -p < db-setup.sql

 

 

3.  iptables 에 룰 한번에 추가하는 php 쉘스크립트 

 

iptables_setup.php

 

#!/usr/bin/php
<?php
iptables_init();
iptables_add_google_spf();
iptables_add_spf("steampowered.com");
iptables_add_spf("certbot.com");
iptables_add_country();

function iptables_init()
{
        shell_exec("iptables -P INPUT ACCEPT");
        shell_exec("iptables -F");
        shell_exec("iptables -Z");
        shell_exec("iptables -A INPUT -i lo -j ACCEPT");
        shell_exec("iptables -A INPUT -s 192.168.0.0/24 -j ACCEPT");
        shell_exec("iptables -A INPUT -s 192.168.0.0/24 -m state --state NEW -j ACCEPT");
        shell_exec("iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT");
        shell_exec("iptables -A INPUT -p tcp -m multiport --dports 80,443 -j ACCEPT");
        shell_exec("iptables -P INPUT DROP");
        shell_exec("iptables -P FORWARD DROP");

}
function iptables_add_spf($domain)
{
        $output = shell_exec("dig $domain txt");
        preg_match_all('/ip4:([^ ]+)/', $output, $matches_ips);
        foreach ($matches_ips[1] as $ip)
        {
                shell_exec("iptables -A INPUT -p tcp -s $ip -d 192.168.0.0/24 --dport 25 -j ACCEPT");
        }
}

function iptables_add_google_spf()
{

        $output = shell_exec("dig _spf.google.com txt");
        preg_match_all('/include:([^ ]+)/', $output, $matches);
        foreach ($matches[1] as $spf)
        {
                $output = shell_exec("dig $spf txt");
                preg_match_all('/ip4:([^ ]+)/', $output, $matches_ips);
                foreach ($matches_ips[1] as $ip)
                {
                        shell_exec("iptables -A INPUT -p tcp -s $ip -d 192.168.0.0/24 --dport 25 -j ACCEPT");
                }
        }

}
function iptables_add_country($country_iso_code = "KR", $jump = "ACCEPT")
{
        $mysqli = new mysqli("localhost", "ddart", "black", "geoip");
        if ($mysqli->connect_errno)
        {
            echo "Failed to connect to MySQL: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error;
        }
        $query = "select ip_from, ip_to from ip_blocks join ip_locations on ip_blocks.geoname_id = ip_locations.geoname_id"
              . " where ip_locations.country_iso_code = '" . $country_iso_code . "' order by ip_blocks.ip_to";



        $ip_from = 0;
        $ip_to = 0;
        $result = $mysqli->query($query);
        if (!$result)
        {
                echo $mysqli->error;
        }
        else
        {
                while($row = $result->fetch_assoc())
                {
                        if ($row['ip_from'] <= $ip_to + 256)
                        {
                                $ip_to = $row['ip_to'];
                        }
                        else
                        {
                                if ($ip_from)
                                {
                                        //$cmd = "iptables -A INPUT -m iprange --src-range " . long2ip($ip_from) . "-" . long2ip($ip_to) . " -j " . $jump;
                                        $cmd = "iptables -A INPUT -p tcp -m iprange --src-range " . long2ip($ip_from) . "-" . long2ip($ip_to) . " -d 192.168.0.0/24 --dport 25 -j " . $jump;
                                        //echo $cmd . "\n";
                                        shell_exec($cmd);
                                }
                                $ip_from = $row['ip_from'];
                                $ip_to = $row['ip_to'];
                        }
                }
        }
}

 

* 관리자별 IP주소대역 추가

 

https://한국인터넷정보센터.한국/jsp/business/management/isCurrentIpv4.jsp

 

엑셀다운로드 후 엑셀을 열어 '다른이름으로 저장하기'에서 csv 포맷으로 변환후

'/root/geoip/providers/KR_IPv4_(2019.06.21).csv' 에 저장.

 

 

vi provider.sql

 

USE geoip;
DROP TABLE IF EXISTS ip_providers;

CREATE TABLE `ip_providers` (

`idx` INT UNSIGNED NOT NULL AUTO_INCREMENT ,
`provider_name` VARCHAR(40) NOT NULL ,
`provider_english_name` VARCHAR(20) NOT NULL ,
`ip_from` INT UNSIGNED NOT NULL ,
`ip_to` INT UNSIGNED NOT NULL ,
`assigned_date` VARCHAR(8) NOT NULL ,
PRIMARY KEY (`idx`)

) ENGINE=MyISAM DEFAULT CHARSET=utf8;


LOAD DATA LOCAL INFILE '/root/geoip/providers/KR_IPv4_(2019.06.21).csv' INTO TABLE ip_providers CHARACTER SET UTF8 COLUMNS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' IGNORE 3 LINES (
provider_name,
provider_english_name,
@ip_from,
@ip_to,
@num,
assigned_date) SET
ip_from = INET_ATON(@ip_from),
ip_to = INET_ATON(@ip_to);

 

 

관리자별 iptables 추가 함수

 

function iptables_add_provider($provider = "에스케이브로드밴드주식회사", $jump = "ACCEPT")
{
        $mysqli = new mysqli("localhost", "사용자", "비밀번호", "geoip");
        if ($mysqli->connect_errno)
        {
            echo "Failed to connect to MySQL: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error;
        }
        $query = "select ip_from, ip_to from ip_providers "
              . " where provider_name = '" . $provider . "' order by ip_to";



        $ip_from = 0;
        $ip_to = 0;
        $result = $mysqli->query($query);
        if (!$result)
        {
                echo $mysqli->error;
        }
        else
        {
                while($row = $result->fetch_assoc())
                {
                        if ($row['ip_from'] <= $ip_to + 256)
                        {
                                $ip_to = $row['ip_to'];
                        }
                        else
                        {
                                if ($ip_from)
                                {
                                        $cmd = "iptables -A INPUT -m iprange --src-range " . long2ip($ip_from) . "-" . long2ip($ip_to) . " -j " . $jump;
                                        //echo $cmd . "\n";
                                        shell_exec($cmd);
                                }
                                $ip_from = $row['ip_from'];
                                $ip_to = $row['ip_to'];
                        }
                }
        }
}

 

 

재부팅후에도 적용되게 저장

 

apt-get install iptables-persistent netfilter-persistent
netfilter-persistent save

 

vi /etc/iptables/rules.v4