CIS 527

Lab 1 - Ubuntu User Management

root

• System Administrator Account
• UID = 0; GID = 0
• Complete Control - No Permissions Checks
• Disabled by Default - No Password
• Set a Password to Enable
• Use "sudo" Instead!

sudo

• "Super User Do"
• Run Commands as "root" User
• Add Users to "sudo" Group
• Permissions in /etc/sudoers
• Use "visudo" to Edit File

Regular User Accounts

• Can Log On Interactively
• Types: Standard & Administrator
• UID: Start at 1000 and Up
• Has Group of Same Name and GID
• Directory in /home
• Important for Module 4

System User Accounts

• Cannot Log On Interactively
• Used by Programs & Services (Daemons)
• Help With File Permissions

Configuring User Accounts

• Settings > Users
• Users and Groups from
  gnome-system-tools
• Terminal

Terminal Commands

• adduser - add a regular user
• useradd - add a system user
• userdel - remove a user
• usermod - modify a user
  • usermod -a -G <group> <user>
    - add user to a group
  • passwd - change a password

Terminal Commands

• groupadd - add a group
• groupdel - remove a group
• groupmod - modify group
• gpasswd - change group restrictions & password
• newgrp - log in to a new group

Important Files

• /etc/passwd
• /etc/shadow
• /etc/group
• /etc/gshadow

Next Step!

Start Lab 1, Task 5:

Configure Ubuntu 20.04