Cài đặt VSFTPD trên CENTOS 6

Posted: June 29, 2012 in CentOS, Hệ điều hành

Để triển khai dịch vụ FTP trên các máy CentOS, chúng ta có rất nhiều lựa chọn như vsftpd, proftpd, pureftpd

Trên Centos 6, để cài đặt và config vsftpd cho dịch vụ FTP, làm như sau:

Bước 1: Install vsftpd:

[root@localhost /]# yum search vsftpd

[root@localhost /]# yum install vsftpd

Bước 2: Config vsftpd:

File config của vsftpd: /etc/vsftpd/vsftpd.conf. File này được sửa lại như sau:

# 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).



# Uncomment this to allow local users to log in.



# Uncomment this to enable any form of FTP write command.



# 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)



# 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.



# Uncomment this if you want the anonymous FTP user to be able to create

# new directories.



# Activate directory messages – messages given to remote users when they

# go into a certain directory.



# Activate logging of uploads/downloads.



# Make sure PORT transfer connections originate from port 20 (ftp-data).



# 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!




# You may override where the log file goes if you like. The default is shown

# below.



# 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.



# You may change the default value for timing out an idle session.



# You may change the default value for timing out a data connection.



# 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.



# 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.



# 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.




# You may fully customise the login banner string:

#ftpd_banner=Welcome to FTP service. Be careful with anything you’ll do

ftpd_banner=Welcome to FTP service.Be careful with anything you will do



# You may specify a file of disallowed anonymous e-mail addresses. Apparently

# useful for combatting certain DoS attacks.


# (default follows)



# 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)



# (default follows)



# 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.




# 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.



# 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 !!















anti_bruteforce_banner=Bruteforce detected. Server in safe mode.
















Edit file chroot_list để add user được quyền sử dụng vsftpd:

[root@localhost vsftpd]# vi chroot_list

Và add user có quyền truy cập vào FTP server, ví dụ:




và edit file sau:

[root@localhost vsftpd]# vi user_list

Add các user mới vào và comment các user có trong file đó như sau:

# vsftpd userlist

# If userlist_deny=NO, only allow users in this file

# If userlist_deny=YES (default), never allow users in this file, and

# do not even prompt for a password.

# Note that the default vsftpd pam config also checks /etc/vsftpd/ftpusers

# for users that are denied.


















Bước 3: Start, stop, restart dịch vụ vsftpd:

[root@localhost vsftpd]# /etc/init.d/vsftpd start

[root@localhost vsftpd]# /etc/init.d/vsftpd restart

[root@localhost vsftpd]# /etc/init.d/vsftpd stop

Bước 4: Các lỗi thường gặp:

  • Gặp thông báo: OOPS: cannot change directory:/home/username

Solution: hãy chắn chắn rằng Selinux đã bị disabled, bằng cách như sau:

Config SELINUX=disabled trong /etc/selinux/config:

# This file controls the state of SELinux on the system.

# SELINUX= can take one of these three values:

# enforcing – SELinux security policy is enforced.

# permissive – SELinux prints warnings instead of enforcing.

# disabled – No SELinux policy is loaded.


# SELINUXTYPE= can take one of these two values:

#       targeted – Targeted processes are protected,

#       mls – Multi Level Security protection.


Reboot lại hệ thống. Sau khi reboot, sử dụng lệnh sau getenforce để kiểm tra:

$ /usr/sbin/getenforce


Nếu không muốn reboot lại máy, có thể dùng lệnh sau:

[root@localhost ~]#setenforce 0

  • Gặp thông báo: OOPS: vsftpd: security: ‘one_process_model’ is anonymous only

Solution: hãy chắn chắn rằng: one_process_model=NO

Tham khảo:

[1] https://security.appspot.com/vsftpd/vsftpd_conf.html

[2] http://sysadmintools.net/tag/vsftpd/

[3] http://linuxmoz.com/centos-disable-selinux/

[4] http://www.linuxtopia.org/online_books/rhel6/rhel_6_selinux/rhel_6_selinux_sect-Security-Enhanced_Linux-Enabling_and_Disabling_SELinux-Disabling_SELinux.html#

[5] http://hi.baidu.com/196568541/blog/item/fc11c7ee62039c18fdfa3c9b.html

[6] http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Managing_Confined_Services/chap-Managing_Confined_Services-File_Transfer_Protocol.html

[7] http://www.server-world.info/en/note?os=CentOS_6&p=ftp&f=1

Hà Nội, ngày 29/06/2012


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