# Example config file /etc/vsftpd/vsftpd.conf
#
# The default compiled in settings are fairly paranoid. This sample file
# loosens things up a bit, to make the ftp daemon more usable.
# Please see vsftpd.conf.5 for all compiled in defaults.
#
# READ THIS: This example file is NOT an exhaustive list of vsftpd options.
# Please read the vsftpd.conf.5 manual page to get a full idea of vsftpd's
# capabilities.
#
# Allow anonymous FTP? (Beware - allowed by default if you comment this out).
anonymous_enable=NO
#
# Uncomment this to allow local users to log in.
local_enable=YES
#
# Uncomment this to enable any form of FTP write command.
write_enable=YES
#
# Default umask for local users is 077. You may wish to change this to 022,
# if your users expect that (022 is used by most other ftpd's)
local_umask=022
#
# Uncomment this to allow the anonymous FTP user to upload files. This only
# has an effect if the above global write enable is activated. Also, you will
# obviously need to create a directory writable by the FTP user.
#anon_upload_enable=YES
#
# Uncomment this if you want the anonymous FTP user to be able to create
# new directories.
#anon_mkdir_write_enable=YES
#
# Activate directory messages - messages given to remote users when they
# go into a certain directory.
dirmessage_enable=YES
#
# Activate logging of uploads/downloads.
xferlog_enable=YES
#
# Make sure PORT transfer connections originate from port 20 (ftp-data).
connect_from_port_20=YES
#
# If you want, you can arrange for uploaded anonymous files to be owned by
# a different user. Note! Using "root" for uploaded files is not
# recommended!
#chown_uploads=YES
#chown_username=whoever
#
# You may override where the log file goes if you like. The default is shown
# below.
#xferlog_file=/var/log/vsftpd.log
#
# If you want, you can have your log file in standard ftpd xferlog format.
# Note that the default log file location is /var/log/xferlog in this case.
xferlog_std_format=YES
#
# You may change the default value for timing out an idle session.
#idle_session_timeout=600
#
# You may change the default value for timing out a data connection.
#data_connection_timeout=120
#
# It is recommended that you define on your system a unique user which the
# ftp server can use as a totally isolated and unprivileged user.
#nopriv_user=ftpsecure
#
# Enable this and the server will recognise asynchronous ABOR requests. Not
# recommended for security (the code is non-trivial). Not enabling it,
# however, may confuse older FTP clients.
#async_abor_enable=YES
#
# By default the server will pretend to allow ASCII mode but in fact ignore
# the request. Turn on the below options to have the server actually do ASCII
# mangling on files when in ASCII mode.
# Beware that on some FTP servers, ASCII support allows a denial of service
# attack (DoS) via the command "SIZE /big/file" in ASCII mode. vsftpd
# predicted this attack and has always been safe, reporting the size of the
# raw file.
# ASCII mangling is a horrible feature of the protocol.
#ascii_upload_enable=YES
#ascii_download_enable=YES
#
# You may fully customise the login banner string:
#ftpd_banner=Welcome to blah FTP service.
#
# You may specify a file of disallowed anonymous e-mail addresses. Apparently
# useful for combatting certain DoS attacks.
#deny_email_enable=YES
# (default follows)
#banned_email_file=/etc/vsftpd/banned_emails
#
# You may specify an explicit list of local users to chroot() to their home
# directory. If chroot_local_user is YES, then this list becomes a list of
# users to NOT chroot().
#chroot_local_user=YES
#chroot_list_enable=YES
# (default follows)
#chroot_list_file=/etc/vsftpd/chroot_list
#
# You may activate the "-R" option to the builtin ls. This is disabled by
# default to avoid remote users being able to cause excessive I/O on large
# sites. However, some broken FTP clients such as "ncftp" and "mirror" assume
# the presence of the "-R" option, so there is a strong case for enabling it.
#ls_recurse_enable=YES
#
# When "listen" directive is enabled, vsftpd runs in standalone mode and
# listens on IPv4 sockets. This directive cannot be used in conjunction
# with the listen_ipv6 directive.
listen=YES
#
# This directive enables listening on IPv6 sockets. To listen on IPv4 and IPv6
# sockets, you must run two copies of vsftpd with two configuration files.
# Make sure, that one of the listen options is commented !!
#listen_ipv6=YES

pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES
session_support=YES

#!/bin/bash
# Тут в принципе может и не надо этого всего но не помеха вдруг какой модуль не подгружен или форвардинг не включен
echo "1" > /proc/sys/net/ipv4/ip_forward
echo "1" > /proc/sys/net/ipv4/ip_dynaddr
modprobe iptable_nat
modprobe ip_conntrack_ftp
modprobe ip_nat_ftp

# Объявление переменных
export IPT="iptables"

# Интерфейс который смотрит в интернет
export WAN=eth1

# Локальная сеть
export LAN=eth0
export LAN_IP_RANGE=192.168.1.0/24

# Очистка всех цепочек iptables
$IPT -F
$IPT -F -t nat
$IPT -F -t mangle
$IPT -X
$IPT -t nat -X
$IPT -t mangle -X

# Закрываем изначально ВСЁ (т.е. изначально все что не разрешено - запрещено):
$IPT -P INPUT DROP
$IPT -P OUTPUT DROP
$IPT -P FORWARD DROP

# разрешаем локальный траффик для loopback и внутренней сети
$IPT -A INPUT -i lo -j ACCEPT
$IPT -A INPUT -i $LAN -j ACCEPT
$IPT -A OUTPUT -o lo -j ACCEPT
$IPT -A OUTPUT -o $LAN -j ACCEPT

# Состояние ESTABLISHED говорит о том, что это не первый пакет в соединении.
# Пропускать все уже инициированные соединения, а также дочерние от них
$IPT -A INPUT -p all -m state --state ESTABLISHED,RELATED -j ACCEPT
# Пропускать новые, а так же уже инициированные и их дочерние соединения
$IPT -A OUTPUT -p all -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
# Разрешить форвардинг для новых, а так же уже инициированных и их дочерних соединений
$IPT -A FORWARD -p all -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT

# Включаем фрагментацию пакетов. Необходимо из за разных значений MTU
$IPT -I FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu

# Отбрасывать все пакеты, которые не могут быть идентифицированы и поэтому не могут иметь определенного статуса.
$IPT -A INPUT -m state --state INVALID -j DROP
$IPT -A FORWARD -m state --state INVALID -j DROP

# Приводит к связыванию системных ресурсов, так что реальный обмен данными становится не возможным.
$IPT -A INPUT -p tcp ! --syn -m state --state NEW -j DROP
$IPT -A OUTPUT -p tcp ! --syn -m state --state NEW -j DROP

# Разрешаем доступ из внутренней сети наружу
$IPT -A FORWARD -i $LAN -o $WAN -j ACCEPT

# Запрещаем доступ снаружи во внутреннюю сеть
$IPT -A FORWARD -i $WAN -o $LAN -j REJECT

# Маскарадинг
$IPT -t nat -A POSTROUTING -o $WAN -s $LAN_IP_RANGE -j MASQUERADE

# Далее дано как пример открытие портов извне:
# **********************************************************************
# Открываем порт для ssh
$IPT -A INPUT -i $WAN -p tcp --dport 22 -j ACCEPT

# Открытие портов для торрентов (такие же указать в torrent-клиенте)
$IPT -A INPUT -i $WAN -p tcp -m multiport --ports 50100:51100 -j ACCEPT

# Открытие 443 порта
$IPT -A INPUT -p tcp --dport 443 -j ACCEPT

# Открываем 80 порт для веб сайтов
$IPT -A INPUT -i $WAN -p all --dport 80 -j ACCEPT
# Открываем ftp 20 порт
$IPT -A INPUT -i $WAN -p ftp --dport 20 -j ACCEPT
$IPT -A INPUT -i $LAN -p ftp --dport 20 -j ACCEPT
# Открытие портов для игровых серверов
$IPT -A INPUT -i $WAN -p tcp --dport 27010:27030 -j ACCEPT
$IPT -A INPUT -i $WAN -p udp --dport 27010:27030 -j ACCEPT
# **********************************************************************
# Вывод информации о состоянии
$IPT -L