Ubuntu change password11/28/2023 If you don't want to alter the default sudo group on your distribution you can create another group, as example sudoers_without_password, and say that this new group and only this one can sudo without password. Yes you should enable all your users to use sudo without using a password. In nut shell no communication from admin(root) to the actual user is required. Note that the trick here is to not to have told users some dummy password which they would then be required to input at the time of login once they are required to to change their password. Simply asked to reset the password and subsequently they can use it only for sudoīut will not be able to login(ssh) using that password. Logs in.but without having to tell him somedummy password up front.The users will be However he will be forced to change the password the first time he This should allow you to have users who can login only using public keys and can not #% echo "%somegroup ALL=(ALL) ALL" > /etc/sudoers #% chgrp -R somegroup `echo ~someuser`/.ssh #% chown -R someuser `echo ~someuser`/.ssh */PasswordAuthentication no/" /etc/sshd/sshd_config This is possible with PAM (it's pretty flexible), but I couldn't tell you how off the top of my head ask a separate question if you need help. You may want to allow some administrative users to log in with a password, or to allow password authentication on the console. Furthermore, make sure you have PasswordAuthentication no in /etc/ssh/sshd_config to disable sshd's built-in password authentication. To disable password authentication, comment out the auth … pam_unix.so line in /etc/pam.d/common-auth. On Ubuntu, the PAM configuration files live in /etc/pam.d. Most services on most modern unices (including Ubuntu) use PAM to configure authentication methods. In your situation, you would disable password authentication in ssh, and possibly in other services. You can disable password authentication selectively. If sudo is configured to require the user's password, then the user must have typed the password to sudo anyway. However, root can change any user's password without knowing the old one hence a user with sudo powers can change his own password without entering it at the passwd prompt by running sudo passwd $USER. The passwd program verifies this (it can be configured not to, but this is not useful or at all desirable in your scenario). The attacker could plant a key logger into the account, but this key logger would be detectable by other users, and could even be watched for automatically.Ī user normally needs to know their current password to change it to a different password. In particular, if a user's SSH key is compromised, the attacker would not be able to elevate to root privileges on the server. In your setup, the user's password would be used only for authentication to sudo. Typically, the user already used their password to authenticate into the account, and typing the password again is a way to confirm that the legitimate user hasn't abandoned their console and been hijacked. If you have any question, please let me know in the comment section below, or join our Discord server.Sudo, in its most common configuration, requires the user to type their password. You should be cautious about who has access to your computer. Please keep in mind that this constitutes a security risk because anyone with access to your sensitive files might quickly change your password. You could also make use of various recovery CDs. So that’s how simple it is to reset the root password in Ubuntu. Set the password for the account with: passwd username Become root on the system by running – sudo chroot /mnt You can now do anything root can on the real install.ħ. Cross-mount things from the Live install so we can “use” the mounted disk (just copy and paste): for d in dev sys run proc do sudo mount -bind /$d /mnt/$d doneĦ.
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