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1.5 KiB
API Reference — Performing Oil & Gas Cybersecurity Assessment
Libraries Used
- csv: Parse asset inventories and compliance questionnaires
- pathlib: File operations
CLI Interface
python agent.py network --assets ot_inventory.csv
python agent.py compliance --csv iec62443_assessment.csv
python agent.py safety --assets ot_inventory.csv
python agent.py report --assets ot_inventory.csv [--compliance-csv iec62443.csv]
Core Functions
assess_network_segmentation(asset_file) — Purdue model zone validation
Checks assets against expected Purdue level placement. Flags zone mismatches and missing DMZ.
assess_iec62443_compliance(assessment_csv) — IEC 62443 security level assessment
Compares achieved vs target Security Levels (SL1-SL4) per zone.
assess_safety_systems(asset_file) — SIS/ESD security posture
Flags CRITICAL: SIS network-connected, remote access enabled, shared controller with process.
generate_assessment_report(...) — Comprehensive sector assessment
OT Asset Categories
| Type | Criticality | Purdue Level |
|---|---|---|
| SCADA | CRITICAL | Level 2 |
| DCS | CRITICAL | Level 1-2 |
| SIS | CRITICAL | Level 0-1 |
| PLC/RTU | HIGH | Level 1 |
| HMI | HIGH | Level 2 |
| Historian | MEDIUM | Level 3 |
Frameworks Referenced
- IEC 62443 (Industrial Automation Security)
- NIST CSF (Cybersecurity Framework)
- API 1164 (Pipeline SCADA Security)
- IEC 61511 (Safety Instrumented Systems)
Dependencies
No external packages — Python standard library only.