![]() We can login as an unprivileged user and then use sudo without providing a password.Īnsible_python_interpreter=/usr/bin/python3 We can login as an unprivileged user and then use sudo after providing the password of the user. We can log in to the remote server as user root using ssh keys. We can log in to the remote server as user root providing password on each login. Pkexec chown root:root /etc/sudoers.d/shutdown_directive pkexec chmod 0440 /etc/sudoers.Some of our options to execute commands as root Use pkexec as shown below this to fix ownership and permissions: $ ls -l /etc/sudoers.d/shutdown_directive -r–r-– 1 root root 86 Mar 10 16:00 /etc/sudoers.d/shutdown_directive The permissions that should be implemented should look like the following: You can use pkexec to solve this as before. If the permissions and/or the ownership are not correct for any sudoers file, sudo will ignore the file which means that might also get locked out as well. Now in order to fix /etc/sudoers.d/shutdown_directive, proceed as follows : Read: ‘usermod’command usage in Ubuntu/Debian : a beginner’s guide To repair /etc/sudoers, proceed as follows : It is possible to fix the files using an alternative tool to sudo, pkexec. If you had accidentally inserted an incorrect statement in the /etc/sudoers or had messed up a file in the directory /etc/sudoers.d, which means that you did not therefore use the visudo to edit your files, you will then be locked out of sudo. Read: How to change the hostname in Ubuntu What if the sudoers is messed up? This will ensure that the permissions and the owner of the new file are set correctly. Sudo visudo -f /etc/sudoers.d/shutdown_directive This is an elegant and convenient way of separating various modifications to the sudo rights leaving at the same time, the original sudoers file unchanged for easier potential future upgrades. Instead of editing the /etc/sudoers file, it is possible to insert the two lines above to a new file in the directory /etc/sudoers.d e.g. ![]() You may be interested to read: How to create a Sudo user on Ubuntu An alternative to /etc/sudoers visudo will actually save your altered file to a temporary folder and will only overwrite the original sudoers file if the modified file has no errors. Note: to not lock yourself out of the system, it is good practice to use the command visudo for editing the sudoers file – This is just a precautionary measure in case you unintentionally write an incorrect statement in the sudoers file. User host = (root) NOPASSWD: /home/userfolder/bin/ ![]() In the example below, the user is able to run any command in the directory /home/userfolder/bin/: Note that the sub directories are not included in this case. In order to run any command in a given directory, the command would need to end with a trailing character (/) and should point to that specific directory. Read: How to switch users on Linux/Ubuntu A relative path is therefore not accepted and will be considered a syntax error. The commands mentioned in the /etc/sudoers file would need to be qualified in full, which means that their absolute path has to be specified correctly as dictated in the sudoers help or man page. ![]() The other commands however will still require a password though. Once this is done, the user ‘user’ will be able run these commands on ‘host’ without a password. User host = (root) NOPASSWD: /sbin/shutdown user host = (root) NOPASSWD: /sbin/reboot If your current user is named ‘user’ and your host ‘host’, you would need to insert the following lines to the file /etc/sudoers: Read: How to reset a user password in Ubuntu The user would need to use the NOPASSWD directive in his /etc/sudoers file (sudoers nopasswd). ![]() NOPASSWD directiveĪn ubuntu user does not want to provide a password when he runs the following commands for instance : Sometimes system administrators or frequent users on Ubuntu do not want to enter a password when they run some specific commands using sudo command.In this article you will learn how to use sudo on commands without having to provide a password. ![]()
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