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