FreeBSD : VSFTPD FTP-PROXY

Vsftpd name come from "Very Secure FTP Daemon". I don't look what is very secure unless the installation is work for me is fine :)

Now we will installing Vsftpd in FreeBSD 8.2. On my network there's a firewall (PF) which using single interface ($ext_if) and with a public IP.

Let start with a Vsftpd installation.
1) If you're unfamiliar with FreeBSD ports style, you can try to search for the path of the vsftpd. Basically in /usr/ports/ftp


# cd /usr/ports
# make search name=vsftpd
Port: vsftpd-2.3.2
Path: /usr/ports/ftp/vsftpd
Info: A FTP daemon that aims to be "very secure"
Maint: dinoex@FreeBSD.org
B-deps:
R-deps:
WWW: http://vsftpd.beasts.org/

2) Install Vsftpd
# cd /usr/ports/ftp/vsftpd
# make install clean

Binary File : /usr/local/libexec/vsftpd &

Sample Configuration File : /usr/local/etc/vsftpd.conf


# Example config file /usr/local/etc/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=YES
#
# Uncomment this to allow local users to log in.
local_enable=YES
#
# Uncomment this to enable any form of FTP write command.
pasv_promiscuous=YES
dirlist_enable=YES
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=FTP SERVER

#

# 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

secure_chroot_dir=/usr/local/share/vsftpd/empty

# If using vsftpd in standalone mode, uncomment the next two lines:

# listen=YES

# background=YES

Installing ftp-proxy

ftp.proxy is a proxy server for a subset of the file tran­
       fer protocol described in RFC 959.   It  forwards  traffic
       between  a client and a server without looking too much if
       both hosts do real FTP.  The  FTP  server  can  be  either
       given on the command line or supplied by the client.

# cd /usr/ports

# make search name=ftpproxy

Port: ftpproxy-1.2.3_1

Path: /usr/ports/ftp/ftpproxy

Info: A ftp proxy

Maint: philippe@le-berre.com

B-deps: gettext-0.18.1.1 gmake-3.81_4 libiconv-1.13.1_1

R-deps:

WWW: http://www.ftpproxy.org/

Binary file : /usr/local/sbin/ftp-proxy

Listen port : 8021

Firewall (PF) Packet Filter Rules

Add this rule in your /etc/pf.conf

rdr-anchor "ftp-proxy/*"

rdr pass on $EXT proto tcp from any to any port ftp -> 127.0.0.1 port 8021

Done