Contents
Why do passwd chsh su and sudo commands need to be set uid programs?
A) These commands need to be Set-UID programs because, we will need permission to change the password or even access a few files when necessary. For example, suppose user X wants to execute the vi command on the file prog.
Why is chsh setuid?
chsh is setuid because in order to change a user’s shell, it must modify the root-owned read-only /etc/passwd file. The system administrator may wish to limit which shells a user may choose, for example if users are assigned a shell which logs all commands to syslog.
What is set UID program?
Setuid, which stands for set user ID on execution, is a special type of file permission in Unix and Unix-like operating systems such as Linux and BSD. It is a security tool that permits users to run certain programs with escalated privileges.
What does the chsh command do?
The chsh command changes a user’s login shell attribute. The shell attribute defines the initial program that runs after a user logs in to the system. This attribute is specified in the /etc/passwd file. By default, the chsh command changes the login shell for the user who gives the command.
Why do passwd need to be set uid programs?
The flags setuid and setgid are needed for tasks that require different privileges than what the user is normally granted, such as the ability to alter system files or databases to change their login password.
How does chmod work?
chmod Modifies File Permissions One set for the owner of the file, another set for the members of the file’s group, and a final set for everyone else. The permissions control the actions that can be performed on the file or directory.
How does set uid work?
Setuid is a Linux file permission setting that allows a user to execute that file or program with the permission of the owner of that file. This indicates that when a user executes this program, the operating system will execute that file not as the user ‘test’, but as the user ‘root’.
Why do we need set uid?
The flags setuid and setgid are needed for tasks that require different privileges than what the user is normally granted, such as the ability to alter system files or databases to change their login password. …
How do you use the chsh command?
How to use chsh? Basic usage is fairly simple – just execute the ‘chsh’ command sans arguments. You’ll be asked for your login password, and after you successfully enter that, you’ll have the option to change your login shell. Note that by default, the login shell for the current user is changed.
What is Linux su command?
The su (short for substitute or switch user) utility allows you to run commands with another user’s privileges, by default the root user. Using su is the simplest way to switch to the administrative account in the current login session.