vsftpd

very secured ftp daemon server

version : vsftpd-2.0.6 (released 2008)

기본 xinetd 형식을 사용하지만, 서비스 포트를 변경할 수 없으므로

standalone으로 운영한다.( 서비스 포트 변경 가능 : listen_port=12345)

# cd /usr/local/src
# lftpget ftp:vsftpd.beasts.org/users/cevans/vsftpd-2.0.6.tar.gz
# tar xzf vsftpd-2.0.6.tar.gz
# make
# make install
</xterm>

[설치 경로]

설치된 실행파일 경로 : /usr/local/sbin/vsftpd

환경설정파일 /etc/vsftpd.conf(listen=YES, listen_port=12345 : '=' 앞뒤에 공백이 없어야함)


iptables 방화벽에서 12345번 포트 오픈해주기

pam 인증파일 /etc/pam.d/vsftpd(/etc/ftpusers 파일에 접속을 거부할 유저명 입력해 두기)


logrotate 파일 /etc/logrotate.d/vsftpd(로그파일을 주기적으로 분할하기 위해)

passive port 사용(pasv_min_port=5000, pasv_max_port=6000)


iptable 방화벽에서 5000:6000 포트 사이 오픈해주기

===== vsftpd.pam, vsftpd.log 파일 복사 =====

# cp RedHat/vsftpd.pam /etc/pam.d/vsftpd
# cp RedHat/vsftpd.log /etc/logrotate.d/vsftpd


===== /etc/vsftpd/vsftpd.conf 링크파일 만들기 =====

# cp vsftpd.conf /etc/vsftpd.conf
# mkdir /etc/vsftpd
# ln -s /etc/vsftpd.conf /etc/vsftpd/vsftpd.conf


===== 환경설정파일 편집 =====

# vim /etc/vsftpd/vsftpd.conf
# 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
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) : chroot에서 제외할 유저를 등록
chroot_list_file=/etc/vsftpd/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.
# IPV4에서 standalone 모드를 사용하기 위해 listen을 사용해야 한다. 
# 이 모드에서는 시작스크립트를 사용할 수 있다.(/etc/init.d/vsftpd)
listen=YES

# standalone 모드에서의 서비스 포트 지정.(xinetd 모드에서는 21번포트만 사용가능)
# 지정한 포트는 iptables에서 오픈해 주어야 한다.
listen_port=12345

# This directive enables listening on IPv6 sockets. To listen on IPv4 and IPv6
# sockets, you must run two copies of vsftpd whith two configuration files.
# Make sure, that one of the listen options is commented !!
#listen_ipv6=YES

# pam을 사용하여 유저 인증.
# /etc/pam.d/vsftpd 파일을 참고하여 인증을 하는데,
# /etc/ftpusers 파일에 접속차단할 유저를 등록하도록 하고 있다..
pam_service_name=vsftpd

# 패시브 포트 : iptables에서 오픈해 주어야 한다.
pasv_min_port=5000
pasv_max_port=6000

# 서버 시스템 로컬시간으로 시간으로 보여준다.
use_localtime=YES


===== chroot에서 제외할 유저 목록 작성 =====

# vim /etc/vsftpd/vsftpd.chroot_list
test


===== 접속 거부할 유저 목록 작성 =====

# vim /etc/ftpusers
# Users that are not allowed to login via ftp
root
bin
daemon
adm
lp
sync
shutdown
halt
mail
news
uucp
operator
games
nobody


===== 시작스크립트 작성 =====

#vim /etc/init.d/vsftpd
#!/bin/bash
#
# vsftpd      This shell script takes care of starting and stopping
#             standalone vsftpd.
#
# chkconfig: 35 60 50
# description: Vsftpd is a ftp daemon, which is the program \
#              that answers incoming ftp service requests.
# processname: vsftpd
# config: /etc/vsftpd/vsftpd.conf

# Source function library.
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0

[ -x /usr/local/sbin/vsftpd ] || exit 0

RETVAL=0
prog="vsftpd"

start() {
        # Start daemons.

        if [ -d /etc/vsftpd ] ; then
                for i in `ls /etc/vsftpd/*.conf`; do
                        site=`basename $i .conf`
                        echo -n $"Starting $prog for $site: "
                        daemon /usr/local/sbin/vsftpd $i
                        RETVAL=$?
                        [ $RETVAL -eq 0 ] && touch /var/lock/subsys/$prog
                        echo
                done
        else
                RETVAL=1
        fi
        return $RETVAL
}

stop() {
        # Stop daemons.
        echo -n $"Shutting down $prog: "
        killproc $prog
        RETVAL=$?
        echo
        [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/$prog
        return $RETVAL
}

# See how we were called.
case "$1" in
  start)
        start
        ;;
  stop)
        stop
        ;;
  restart|reload)
        stop
        start
        RETVAL=$?
        ;;
  condrestart)
        if [ -f /var/lock/subsys/$prog ]; then
            stop
            start
            RETVAL=$?
        fi
        ;;
  status)
        status $prog
        RETVAL=$?
        ;;
  *)
        echo $"Usage: $0 {start|stop|restart|condrestart|status}"
        exit 1
esac

exit $RETVAL


===== 시작스크립트 init 서비스에 탑재 =====

# chmod 700 /etc/init.d/vsftpd
# chkconfig --add vsftpd
# chkconfig --list vsftpd
vsftpd          0:해제  1:해제  2:해제  3:활성  4:해제  5:활성  6:해제


===== vsftpd 시작 =====

# /etc/init.d/vsftpd start

또는

# service vsftpd start


===== vsftpd 재시작 =====

# /etc/init.d/vsftpd restart

또는

# service vsftpd restart


===== vsftpd 종료 =====

# /etc/init.d/vsftpd stop

또는

# service vsftpd stop