Implementing File Integrity Monitoring with AIDE
Overview
AIDE (Advanced Intrusion Detection Environment) is a host-based intrusion detection system that monitors file and directory integrity using cryptographic checksums. This skill covers generating AIDE configuration files, initializing baseline databases, running integrity checks, parsing change reports, and setting up automated cron-based monitoring with alerting.
Prerequisites
- AIDE installed on target Linux system (apt install aide / yum install aide)
- Root or sudo access for file system scanning
- Python 3.8+ with standard library
Steps
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Generate AIDE Configuration — Create aide.conf with monitoring rules for critical directories (/etc, /bin, /sbin, /usr/bin, /boot)
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Initialize Baseline Database — Run aide --init to create the initial file integrity baseline
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Run Integrity Check — Execute aide --check to compare current state against baseline
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Parse Change Report — Extract added, removed, and changed files from AIDE output
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Configure Automated Monitoring — Generate cron job for scheduled integrity checks
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Generate Compliance Report — Produce structured report of all file changes with severity classification
Expected Output
- AIDE configuration file (aide.conf)
- Baseline database creation status
- JSON report of file changes (added/removed/changed) with severity
- Cron job configuration for automated monitoring
