To use the vsftpd service, you need to install the vsftpd software. Generally, the system does not need to provide extra commands, which are secure for the system. vsftpd integrates most of the extra commands (such as dir, ls, and cd) used by FTP.The upper-layer program has low permission and does not affect the system. Any vsftpd command that requires high execution permission is controlled by a special upper-layer program.In addition, the vsftpd service uses chroot to change the root directory, preventing the risk of misusing system tools. The startup user of the vsftpd service is a common user who has low system permission.The vsftpd is designed with the following features: The vsftpd is introduced to build a security-centric FTP server. This section describes the Very Secure FTP Daemon (vsftpd), to use FTP in a more secure way. Introduction to vsftpdįTP has a long history and uses the unencrypted transmission mode, and is therefore considered insecure. Port 21 is used to receive connection requests from the FTP client, and port 20 is used by the FTP server to proactively connect to the FTP client. The FTP service requires multiple network ports. This protects the system and keeps the system secure. In this way, users can access only the main directory, but not important directories such as /etc, /home, and /usr/local. This environment is called change root (chroot for short). After a user logs in to the system through FTP, the root directory displayed by the system is the home directory of the user. Users can obtain log information from the /var/log/ directory.įTP can limit the work scope of a user to the home directory of the user. Real users have complete access permissions, while anonymous users have only the permission to downloading resources.įTP can use the syslogd to record data, including historical commands and user transmission data (such as the transmission time and file size). The three types of users have different access permissions. In addition, the FTP server provides the following functions:īy default, the FTP server classifies users into real users, guest users, and anonymous users based on the login status. FTP allows users to access files on a remote system using a set of standard commands without logging in to the remote system. It is used to transfer files between the server and client. Verifying Whether the FTP Service Is Successfully Set Upįile Transfer Protocol (FTP) is one of the earliest transmission protocols on the Internet.Configuring the Login Permission of a System Account.
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