1.安装认证所需包

首先安装PAM（用于用户认证）和DB4（用于生成虚拟用户的用户名密码的db文件）

2. 安装vsftpd

1. 配置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=YES

#

# Uncomment this to allow local users to log in.

# When SELinux is enforcing check for SE bool ftp_home_dir

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.

# When SELinux is enforcing check for SE bool allow_ftpd_anon_write, allow_ftpd_full_access

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/xferlog

#

# 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. The vsftpd.conf(5) man page explains

# the behaviour when these options are disabled.

# 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().

# (Warning! chroot'ing can be very dangerous. If using chroot, make sure that

# the user does not have write access to the top level directory within the

# chroot)

chroot_local_user=YES

local_root=/rmanbak

anon_root=/rmanbak

#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=NO

#

# This directive enables listening on IPv6 sockets. By default, listening

# on the IPv6 "any" address (::) will accept connections from both IPv6

# and IPv4 clients. It is not necessary to listen on *both* IPv4 and IPv6

# sockets. If you want that (perhaps because you want to listen on specific

# addresses) then 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

pam_service_name=vuser.vu

user_config_dir=/etc/vsftpd/vuser_config

userlist_enable=YES

tcp_wrappers=YES

allow_writeable_chroot=YES

one_process_model=NO

guest_enable=YES

guest_username=root

*重要参数说明：

anonymous_enable=NO 不允许匿名访问

local_enable=YES 本地用户可以访问，如果设置成NO的话，ftp这个系统本地用户没法进行访问了，所有的ftp客户端当然也没法进行上传下载了。

write_enable=YES #可写（可上传）

 

xferlog_enable=YES

xferlog_file=/etc/vsftpd/vsftpd.log

xferlog_std_format=YES

这3项由于设置log日志，记得在/etc/vsftpd/下新建一个vsftpd.log文件。

 

guest_enable=YES #启用虚拟用户

guest_username=root #虚拟用户借用的系统本地用户名

user_config_dir=/etc/vsftpd/vuser_config #虚拟用户的配置文件路径，所以别忘了在/etc/vsftpd/目录下新建一个virtualuser_conf文件夹

5. 配置虚拟用户

比如我要添加一个叫abc用户，ftp客户端就使用该用户名（密码后面设置）进行上传下载，在/etc/vsftpd/vuser_config新建一个名叫abc的文件：touch abc 。文件里面的内容为：

1. 创建虚拟用户[用户和密码]文件
   # vi /etc/vsftpd/vuser-list
   abc   [用户名]
   1qaz2wsx   [密码]
   bcd [用户名]
   123123 [密码]

5.加密用户密码文件生成数据库文件
# cd /etc/vsftpd/
# db_load -T -t hash -f ./vuser-list ./vuser-list.db
# chmod 600 vuser-list.db

5.创建PAM认证文件
# vi /etc/pam.d/vuser.vu
auth required /lib64/security/pam_userdb.so db=/etc/vsftpd/vuser-list #注意64位系统写/lib64这个路径，32位系统要写成/lib，下同！
account required /lib64/security/pam_userdb.so db=/etc/vsftpd/vuser-list

6.aix下测试访问

ftp 10.100.100.240
用户：abc
密码：1qaz2wsx
ls
mget xjcrm201.dmp