GitHub - nuver-labs/vps-audit: lightweight, dependency-free bash script for security, performance auditing and infrastructure monitoring of Linux servers.

A comprehensive Bash script for auditing the security and performance of your VPS (Virtual Private Server). This tool performs various security checks and provides a detailed report with recommendations for improvements.

nuverlabs.com/vps-audit · a Nuver Labs project

Features

Security Checks

SSH Configuration - Root login status - Password authentication - Non-default port usage
Firewall Status (UFW/firewalld/iptables/nftables)
Intrusion Prevention (Fail2ban/CrowdSec) Configuration
- Fail2ban SSH jail port alignment (catches bans that silently do nothing)
Failed Login Attempts
System Updates Status
Running Services Analysis
Open Ports Detection
Sudo Logging Configuration
Password Policy Enforcement (via pwquality.conf)
SUID Files Detection

Performance Monitoring

Disk Space Usage
Memory Usage
CPU Usage
Active Internet Connections

Requirements

Ubuntu/Debian-based Linux system
Root access or sudo privileges
Basic packages (most are pre-installed):
- ufw
- systemd
- netstat/ss
- grep
- awk

Installation

Download the script:

wget https://raw.githubusercontent.com/Nuver-Labs/vps-audit/main/vps-audit.sh
# or
curl -O https://raw.githubusercontent.com/Nuver-Labs/vps-audit/main/vps-audit.sh

Make the script executable:

Usage

Run the script with sudo privileges:

The script will:

Perform all security checks
Display results in real-time with color coding:
- 🟢 [PASS] - Check passed successfully
- 🟡 [WARN] - Potential issues detected
- 🔴 [FAIL] - Critical issues found
Generate a detailed report file: vps-audit-report-[TIMESTAMP].txt

Output Format

The script provides two types of output:

Real-time console output with color coding:

[PASS] SSH Root Login - Root login is properly disabled in SSH configuration
[WARN] SSH Port - Using default port 22 - consider changing to a non-standard port
[FAIL] Firewall Status - UFW firewall is not active - your system is exposed

A detailed report file containing:
- All check results
- Specific recommendations for failed checks
- System resource usage statistics
- Timestamp of the audit

Customization

The script's behavior, file paths, and scoring limits are fully controlled by variables defined in the Configuration section at the top of the script file.

1. Dynamic Thresholds for PASS/WARN/FAIL Status

These variables define the numerical limits that trigger a WARN or FAIL status.

Variable Default Value Check Description RESOURCE_WARN 50 Resource Usage WARN if Disk/Memory/CPU usage is between 50-80%. RESOURCE_FAIL 80 Resource Usage FAIL if Disk/Memory/CPU usage is more than 80%. SERVICES_WARN 20 Running Services WARN if between 20-40 services are running. SERVICES_FAIL 40 Running Services FAIL if more than 40 services are running. LOGINS_WARN 10 Failed Logins WARN if between 10-50 failed login attempts are detected. LOGINS_FAIL 50 Failed Logins FAIL if more than 50 failed login attempts are detected. OPEN_PORTS_WARN 10 Open Ports WARN if between 10-20 listening ports are found. OPEN_PORTS_FAIL 20 Open Ports FAIL if more than 20 listening ports are found. PASSWORD_MINLEN 12 Password Policy PASS if minlen in pwquality.conf is at least this value.

2. Report Output and Ownership

These variables control where the report is saved and the file permissions.

Variable Default Value Description DEFAULT_REPORT_DIR . (The current directory) The directory where the report file will be saved. ENABLE_CHOWN false If true, sets ownership of the report file and (if newly created) the report directory to REPORT_CHOWN_OWNER. REPORT_CHOWN_OWNER ${SUDO_USER:-$(id -un)}:<their group> The target user:group for chown. Defaults to the user who invoked sudo, so reports are not left owned by root. REPORT_FILENAME vps-audit-report-$(TIMESTAMP).txt The template name for the generated report file.

3. Security Check File Paths

You can adjust the paths the script uses to check critical configuration files:

Variable Default Value Description OS_RELEASE_FILE /etc/os-release Path to the Operating System release file. REBOOT_REQUIRED_FILE /var/run/reboot-required File indicating a system restart is needed. SSH_CONFIG_FILE /etc/ssh/sshd_config Main SSH daemon configuration file. AUTH_LOG_FILE /var/log/auth.log Log file checked for failed login attempts. SUDOERS_FILE /etc/sudoers File checked for sudo logging configuration. PASSWORD_QUALITY_CONF /etc/security/pwquality.conf Password complexity policy configuration file. FAIL2BAN_CONFIG_DIR /etc/fail2ban Fail2ban config directory, read to verify the SSH jail port.

Best Practices

Run the audit regularly (e.g., weekly) to maintain security
Review the generated report thoroughly
Address any FAIL status immediately
Investigate WARN status during maintenance
Keep the script updated with your security policies

Limitations

Designed for Debian/Ubuntu-based systems
Requires root/sudo access
Some checks may need customization for specific environments
Not a replacement for professional security audit

Contributing

Feel free to submit issues and enhancement requests!

License

This project is licensed under the MIT License - see the LICENSE file for details.

About

vps-audit is built and maintained by Nuver Labs.

Project page: nuverlabs.com/vps-audit
More from us: github.com/nuver-labs

Security Notice

While this script helps identify common security issues, it should not be your only security measure. Always:

Keep your system updated
Monitor logs regularly
Follow security best practices
Consider professional security audits for critical systems

Support

For support, please:

Check the existing issues
Create a new issue with detailed information
Provide the output of the script and your system information

Stay secure! 🔒