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In this chapter you first learned about the role of web servers in the Internet, how they handle requests and responses using the HTTP protocol. One of the most widely used web servers, Apache, is provided with CentOS, and you also saw how to set up Apache in different configurations ranging from simple web pages to generating HTML pages on the fly using CGI and PHP. Securing web site traffic with OpenSSL is a must if the HTTP transactions will involve sensitive information. In the next chapter, you will learn about file sharing services that are available in CentOS to use in your network.
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C H A P T E R 14
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In today s networked world, file sharing is an essential function needed by almost all computer users. Modern operating systems support different types of file sharing services such as anonymous FTP downloads, network printing, and remote directories. Since Linux was created with networking in mind from the beginning, we can seamlessly implement frequently used file sharing services when the need arises. For this chapter, you are going to install three servers to allow your intended users to share resources: an FTP server to allow users to download and upload files to their computers, a Linux/Unix network using NFS to allow sharing large files, and finally, a Samba server that can allow our Linux computer to share files and printers with Windows computers.
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The vsftpd (Very Secure FTP daemon) is an FTP server developed by Chris Evans. vsftpd was created with security from the start to prevent the common problems that affect most FTP servers, and it includes the restriction of privileges by letting the server run with a less-privileged user and the use of chroot(). Having chroot() limits directory visibility and thus lessens the chances of an attacker roaming the system if one does break in. When you need a stronger security mechanism with vsftpd, you can use OpenSSL to encrypt the file transfers. As an FTP server, vsftpd supports both passive and active file transfers. It also listens on the default port 21, unless you change the port number on the configuration file. You can install vsftpd in your CentOS system by typing the command yum install vsftpd in the shell as the root user. After the command completes, the tools and the configuration file for vsftpd will be available for your use.
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You can configure how vsftpd runs using its configuration files located on /etc/vsftpd. The /etc/vsftpd directory contains four files: userlist, and vsftpd_conf_migrate.sh. The last file is a shell script designed to migrate older vsftpd configuration files to be compatible with the newer version that you just installed.
vsftpd.conf
The vsftpd.conf file is the main configuration file of vsftpd. It contains directives that control the execution of vsftpd. These directives are separated into lines and it follows the format
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CHAPTER 14 FILE SHARING SERVICES
directive_name=value where directive_name is the directive you are going to use and value is the assigned value to be used on this directive. Here is an example directive on the default configuration file: anonymous_enable=YES The name of the directive is anonymous_enable; it allows anonymous users such as ftp and anonymous to use your FTP server and is enabled by the value of YES. Be careful when specifying directives, because vsftpd will complain if it finds spaces beside the assignment operator (=). Lines that start with a hash symbol (#) are generally referred to as comments and are ignored by vsftpd. You can run vsftpd using the default configuration file and test out things on your network. It will use the default unprivileged user called ftpsecure and will run with chroot() to prevent attacks on your FTP server. You can change directives later that will match the requirements of your network using this file and running service vsftpd restart to make your changes effective. Other directives that you can use are found on the man pages of vsftpd.conf.
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