Security & Hardening Scripts

Shell Scripts for Auditing User Permissions on Ubuntu

user permission audit script ubuntu security audit bash user management

Why Your Ubuntu Server is Probably a Sieve

A glowing green padlock covered in cobwebs inside a dark, messy server room, cinematic lighting, hyper-realistic, 8k, cyberpunk vibe --ar 16:9

You spun up an Ubuntu box. Set up a few users. Gave your dev team access. Fast forward six months. Who actually has access right now? You probably don't know. That's a problem. A massive one. Stale accounts and over-privileged users are the easiest way for a server to get compromised. Let's fix that with a proper user permission audit script. No expensive enterprise tools. Just raw bash user management to lock things down.

Hunting Down the Ghost Accounts

A glowing terminal screen displaying green code, reflecting off a hacker's glasses in a dark room, gritty realism, high contrast --ar 16:9

First things first. We need to see who is actually living on your server. Checking `/etc/passwd` manually is mind-numbing. So, let's script it. We want to filter out the system accounts and only look at actual humans. Any user with a UID over 1000 is your target. If you see 'Dave from marketing' in there, and Dave left three years ago, you've got an immediate security risk. Your ubuntu security audit starts by purging the ghosts.

Sudoers Gone Wild

A chaotic desk with scattered files, a red stamp that says 'DENIED', dramatic shadows, top-down view, photorealistic --ar 16:9

Handing out sudo privileges is like handing out loaded weapons. People get careless. You need a script that actively checks the `sudo` group and parses `/etc/sudoers.d/`. It’s surprisingly common to find random service accounts with passwordless root access. That is an absolute disaster waiting to happen. A solid bash script will scrape these files and spit out exactly who can run commands as root. Take those permissions away. Be ruthless.

The Bash Script You Actually Need

Stop typing commands one by one. Here is the logic for a bulletproof user permission audit script. You want to iterate through active users, check their group memberships, and verify password expiry dates. Dump the output into a clean CSV file. Why? Because you can easily pipe that into an alert system or just read it over your morning coffee. Clean, automated bash user management.

Putting It on Autopilot

Running this once is great. Running it every Sunday night via cron is better. Set your script to generate a report, compare it against last week's baseline, and email you if anything changed. Did someone add a new user? Did an existing user get dumped into the root group? You need to know instantly. Automation is the only way a real ubuntu security audit survives the real world.