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- Add scripts/agent.py and references/api-reference.md to all remaining skills - Update all 648 LICENSE files: copyright now reads 'Mahipal' - Add implementing-security-monitoring-with-datadog (new skill with full anatomy) - All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md
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API Reference: Implementing IEC 62443 Security Zones
Purdue Reference Model Levels
| Level | Name | Assets |
|---|---|---|
| 0 | Process | Sensors, actuators |
| 1 | Basic Control | PLCs, RTUs, safety controllers |
| 2 | Area Supervisory | HMIs, engineering workstations |
| 3 | Site Operations | Historians, OPC servers, MES |
| 3.5 | DMZ | Data diode, patch server |
| 4 | Enterprise | ERP, email, business systems |
| 5 | External | Internet, cloud, vendors |
IEC 62443 Security Levels
| SL | Protection Against |
|---|---|
| SL1 | Casual or coincidental violation |
| SL2 | Intentional violation using simple means |
| SL3 | Sophisticated attack with moderate resources |
| SL4 | State-sponsored attack with extended resources |
Zone Audit Checks
| Check | Severity | Description |
|---|---|---|
| No SL-T defined | CRITICAL | Zone missing security level target |
| SL gap (achieved < target) | HIGH | Controls below target |
| No conduit controls | CRITICAL | Unprotected zone boundary |
| IT-OT bypass DMZ | CRITICAL | Direct Level 4/5 to Level 0/1 |
| Remote access without MFA | CRITICAL | Unprotected remote conduit |
Conduit Security Controls
| Control | Purdue Boundary | Required |
|---|---|---|
| Protocol-aware firewall | L0-L1, L1-L2 | Yes |
| Data diode | L3-DMZ | Recommended |
| IDS/IPS | L2-L3, DMZ | Yes |
| VPN + MFA | DMZ-External | Yes |