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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
56 lines
1.5 KiB
Markdown
56 lines
1.5 KiB
Markdown
# API Reference: Implementing ICS Firewall with Tofino
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## OT Protocol Ports
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| Protocol | Port | Layer | DPI Support |
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|----------|------|-------|-------------|
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| Modbus/TCP | 502 | TCP | Yes |
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| EtherNet/IP | 44818 | TCP/UDP | Yes |
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| DNP3 | 20000 | TCP | Yes |
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| OPC UA | 4840 | TCP | Yes |
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| S7comm | 102 | TCP | Yes |
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| BACnet | 47808 | UDP | Yes |
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| IEC 61850 MMS | 102 | TCP | Yes |
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## Risky Modbus Function Codes
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| Code | Function | Risk |
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|------|----------|------|
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| 5 | Write Single Coil | HIGH |
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| 6 | Write Single Register | HIGH |
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| 15 | Write Multiple Coils | HIGH |
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| 16 | Write Multiple Registers | HIGH |
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| 22 | Mask Write Register | HIGH |
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## Tofino Xenon Configuration
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```xml
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<TofinoRule>
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<Action>Allow</Action>
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<Source>192.168.1.10</Source>
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<Destination>192.168.1.50</Destination>
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<Protocol>Modbus</Protocol>
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<Port>502</Port>
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<DPI enabled="true">
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<AllowedFunctions>1,2,3,4</AllowedFunctions>
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</DPI>
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<Logging>true</Logging>
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</TofinoRule>
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```
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## Rule Audit Checks
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| Check | Severity | Description |
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|-------|----------|-------------|
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| Allow-any-any | CRITICAL | Overly permissive rule |
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| No default deny | CRITICAL | Missing deny-all at end |
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| No DPI for OT protocol | HIGH | Missing deep packet inspection |
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| Write functions allowed | HIGH | Modbus write codes permitted |
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| Allow without logging | MEDIUM | No audit trail |
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### References
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- Belden Tofino: https://www.belden.com/products/industrial-networking/cybersecurity
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- IEC 62443-3-3: Industrial Automation Security
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- NIST SP 800-82: Guide to ICS Security
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