VSFTP全称为Very Safe Ftp,可见相对于Linux的其它FTP版本安全性有了很大的提高。
    本人曾为某一学院创建了一个FTP站点,其中学生只能只读,而教师可以写入。以下是创建过程:
 
 
一、             建立用户和组群:
1、  建立组群:public  用户成员:student  teacher
          student
          teacher
2、  建立用户:student   组群:public   主目录:/home/public/student
          teacher  
组群:public   主目录:/home/public
二、             目录权限
1/home/public
  
文件拥有者:teacher   权限:rwx   组群:public    r_x
2/home/public/student
  
文件拥有者:student   权限:r_x   组群:public    rwx
三、vsftpd.chroot_list文件内容
    [root@linux-ftp linux]# more /etc/vsftpd.chroot_list
teacher
student
四、具体配置vsftpd.conf
[root@linux-ftp linux]# cat /etc/vsftpd/vsftpd.conf
 
# Example config file /etc/vsftpd.conf
#
# The default compiled in settings are very paranoid. This sample file
# loosens things up a bit, to make the ftp daemon more usable.
#
# Allow anonymous FTP?
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    /*如果启动这个选项,使用者第一次进入一个目录时,会检查该目录下是否有.message 这个档案,若是有,则会出现此档案的内容,通常这个档案会放置欢迎话语,或是对该目录的说明。默认值为开启。*/
#
# Activate logging of uploads/downloads.
xferlog_enable=YES   /*如果启动,上传与下载的信息将被完整纪录在底下xferlog_file 所定义的档案中。预设为开启。*/
#
# 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  /*如果启动,则纪录文件将会写为xferlog 的标准格式,如同wu-ftpd 一般。默认值为关 闭。 */
 
#
# 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 turning on ascii_download_enable enables malicious remote parties
# to consume your I/O resources, by issuing the command "SIZE /big/file" in
# ASCII mode.
# These ASCII options are split into upload and download because you may wish
# to enable ASCII uploads (to prevent uploaded scripts etc. from breaking),
# without the DoS risk of SIZE and ASCII downloads. ASCII mangling should be
# on the client anyway..
#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_list_enable=YES    /*如果启动这项功能,则所有的本机使用者登入均可进到根目录之外的数据夹,除了列在/etc/vsftpd.chroot_list 之中的使用者之外。默认值为NO*/
# (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
 
pam_service_name=vsftpd
userlist_enable=YES    /*若是启动此功能,则会读取/etc/vsftpd.user_list 当中的使用者名称。此项功能可以在询问密码前就出现失败讯息,而不需要检验密码的程序。默认值为关闭。
*/
#enable for standalone mode
listen=YES   /*若是启动,则vsftpd 将会以独立运作的方式执行,若是vsftpd 独立执行,如RedHat9 的默认值,则必须启动 若是vsftpd 包含在xinetd 之中,则必须关闭此功能,如 RedHat8。在RedHat9 的默认值为YES */
tcp_wrappers=YES   /*如果启动,则会将vsftpd tcp wrapper 结合,也就是可以在/etc/hosts.allow /etc/hosts.deny 中定义可联机或是拒绝的来源地址。*/
max_clients=1000
#max_per_ip=5
#anon_max_rate=1024000
#local_max_rate=1024000
[root@linux-ftp linux]#
 
3.2.1. 直接重启动VSFTP 服务
这个范例是套用RedHat 的预设范例,直接启动vsftp
[root@relay vsftpd]# /sbin/service vsftpd  restart
Starting vsftpd for vsftpd: OK ]