🛡️ Linux Admin Project: Secure Bank Customer Portal with Automated Auditing

#aws #linux #devops #cloudwhislter

A Real-World Banking System Using useradd, chmod, ACLs, systemd, and More!

🚀 What if you could manage 10,000 bank customers using only Linux commands?
In this hands-on project, you’ll simulate a secure banking portal that handles users, enforces privacy, encrypts backups, and even triggers alerts on suspicious activity.

🏦 Scenario: You’re the Sysadmin for a Bank

Your Mission:

Give employees admin access (but safely).

Ensure customers can only access their data.

Maintain daily encrypted transaction logs.

Detect fraudulent logins in real time.

Let’s turn a regular Linux machine into a secure bank portal. 💻💸

## 📑 Table of Contents

🔧 Step 1: Create Users & Groups
💰 Step 2: Secure the Banking Directories
🔍 Step 3: Monitor Suspicious Activity
⏰ Step 4: Automate Encrypted Daily Backups
🏧 Step 5: Simulate a Customer Login
💻 Demo: Bank Customer Login Simulation

🔧 Step 1: Create Users & Groups

🛠 Tools: useradd, usermod, groups

# Employees and Customers

Similarly, Create Groups, Assign Users to groups

sudo groupadd employees
sudo groupadd customers

sudo usermod -aG employees manager teller
sudo usermod -aG customers john jane

✅ Why?

Groups control permissions.

Customers can’t peek into each other’s data.

Employees can manage transactions but not compromise privacy.

💰 Step 2: Secure the Banking Directories

🛠 Tools: mkdir, chmod, chown, setfacl

# Create folders

# Permissions

# Let employees read but not write customer data

🔒 Why?

chmod 700: Only the customer can access their folder.

setfacl: Employees can view but not edit customer files.

/bank/transactions: Editable only by employees.

🔍 Step 3: Monitor Suspicious Activity

🛠 Tools: grep, journalctl, find

# Failed logins (fraud detection)

sudo grep "Failed password" /var/log/auth.log