Rackspace Cloud Essentials - CentOS - Installing vsftpd


Following the previous articles in this series, you should now have an active Cloud Server that is secured and has scheduled backups configured. Next, you'll want to upload your web content to the server. When you think of transferring files, you probably think of the File Transfer Protocol (FTP) because it has been around for so long. While simple to use, FTP has become obsolete because it lacks the ability for secure file transfers.

Instead, we recommend installing and using a secure file transfer mechanism, and we will introduce you to a few of them in this guide. This article will show you how to install vsftpd (very secure FTP daemon), the FTP client, and will also walk you through some useful administration and security steps.

Installation

Configuration

Access your server through FTP

Installation

Install vsftpd

Using the group install available in the YUM package manager makes this step very easy. Use the following command to install everything you will need:

sudo yum install vsftpd

Turn on vsftpd

Using the service command, this is how you startup vsftpd:

sudo service vsftpd start

Wow, that was quick! We have a working install of vsftpd already on the server. Lets go ahead and make a couple of configuration changes for security and convenience.

 

Configuration

Set vsftp service to start on reboot

You can use the chkconfig tool to view which services will start automatically when the server boots, and on which run level they'll start with. To get vsftpd to start on the most common run levels (3,4,5) you can use:

sudo chkconfig vsftpd on

Verify the "on" status by checking the complete chkconfig output:

chkconfig --list

or for specific output

chkconfig --list vsftpd

The standard vsftpd configuration file and all subsequent files for CentOS will reside in the directory /etc/vsftpd/ the most important file being vsftpd.conf. We need to make two changes to this file for security and convenience:

OPEN up /etc/vsftpd/vsftpd.conf in your favorite editor:

Disable anonymous users

It is generally advised to disable anonymous FTP, unless you have a specific requirement to use it.
Change:

# Allow anonymous FTP? (Beware - allowed by default if you comment this out). anonymous_enable=YES 

to read:

# Allow anonymous FTP? (Beware - allowed by default if you comment this out).
anonymous_enable=NO

Restriciting user access

Now configure vsftpd to be able to chroot(commonly referred to as jailing or jail) users to their home directories for security and privacy:
Change:

# 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
# (default follows)
chroot_list_file=/etc/vsftpd/chroot_list
to read:

# 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=NO
# (default follows)
chroot_list_file=/etc/vsftpd/chroot_list

Also, lock down vsftpd to a predictable port range. (By default, vsftpd runs in passive mode and will choose a port between 1024-65535). Add the following:

pasv_min_port=3000
pasv_max_port=3050

Finally we need to make sure that users are jailed in their home directory. At the bottom of the file add the following:
chroot_local_user=YES

Create the chroot_list file so you do not get an error when restarting:

sudo touch /etc/vsftpd/chroot_list

If your server runs CentOS 5.x, open ports in your firewall by running:

iptables -I RH-Firewall-1-INPUT 1 -p tcp --dport 3000:3050 -j ACCEPT
iptables -I RH-Firewall-1-INPUT -m tcp -p tcp --dport 21 -j ACCEPT
If your server runs CentOS 6.x, open ports in your firewall by running:
iptables -I INPUT -m tcp -p tcp --dport 21 -j ACCEPT
iptables -I INPUT 1 -p tcp --dport 3000:3050 -j ACCEPT

Access your server through FTP

Using a browser

Simply input the name of your FTP site into a browser address bar as shown here, and supply the login credentials when prompted:

Using an FTP client

There are many low-cost or free FTP applications, such as CyberDuck and Fireuploader, that are available for download.

Using the command line

Here is the syntax for opening an FTP session from the command line:

ftp example.com

To close the FTP session, simply type exit in the session window.

 



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