securing-historian-server-in-ot-environment

name	securing-historian-server-in-ot-environment
description	Audits and hardens process historian servers (OSIsoft PI, Honeywell PHD, GE Proficy, AVEVA Historian) in OT environments: Purdue-level network placement, interface access control, secure DMZ replication via data diodes or PI-to-PI connectors, SQL injection prevention, and process data integrity. Use when auditing or hardening a historian server, or designing secure OT-to-IT data replication through a DMZ.
domain	cybersecurity
subdomain	ot-ics-security
tags	["ot-security","ics","scada","industrial-control","iec62443","historian","osisoft-pi","data-integrity"]
version	1.0.0
author	mahipal
license	Apache-2.0
nist_csf	["PR.IR-01","DE.CM-01","ID.AM-05","GV.OC-02"]
mitre_attack	["T1078","T1190","T1059","T1055","T0816"]

Securing Historian Server in OT Environment

When to Use

• When deploying a new historian server in an OT environment and configuring it securely from the start
• When hardening an existing historian after a security assessment identified it as a high-risk target
• When designing historian data replication architecture through a DMZ for IT access to process data
• When implementing access controls to prevent unauthorized modification of historical process data
• When investigating suspected historian compromise or data integrity issues

Do not use for IT-only database security without OT data (see general database hardening), for real-time SCADA data transmission security (see detecting-attacks-on-scada-systems), or for historian selection and sizing decisions.

Prerequisites

• Historian platform (OSIsoft PI, Honeywell PHD, GE Proficy, AVEVA Historian) installed and operational
• Network segmentation with historian placed in Level 3 (Site Operations) per Purdue Model
• Understanding of data flows: field devices -> PLCs -> OPC servers -> historian
• Access to historian administration credentials
• DMZ infrastructure for IT-facing data replication

Workflow

Step 1: Audit Current Historian Security Configuration

Evaluate the current security posture of the historian server including network exposure, authentication, and access controls.

#!/usr/bin/env python3
"""Historian Security Audit Tool.

Evaluates the security configuration of process historian servers
including network exposure, authentication, access controls,
and data integrity protections.
"""

import json
import socket
import ssl
import subprocess
import sys
from dataclasses import dataclass, field, asdict
from datetime import datetime


@dataclass
class AuditFinding:
    finding_id: str
    severity: str
    category: str
    title: str
    detail: str
    remediation: 


 :
    

     ():
        .ip = historian_ip
        . = historian_type
        .findings = []
        .counter = 

     ():
        
        ()

        
        ports_to_check = {
            : (, ),
            : (, ),
            : (, ),
            : (, ),
            : (, ),
            : (, ),
            : (, ),
            : (, ),
            : (, ),
            : (, ),
            : (, ),
        }

        exposed = []
         port, (service, desc)  ports_to_check.items():
            :
                sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                sock.settimeout()
                result = sock.connect_ex((.ip, port))
                sock.close()
                 result == :
                    exposed.append({: port, : service, : desc})
             Exception:
                

        
         svc  exposed:
             svc[]  (, , , ):
                .findings.append(AuditFinding(
                    finding_id=,
                    severity=,
                    category=,
                    title=,
                    detail=,
                    remediation=,
                ))
                .counter += 

         (s[] ==   s  exposed):
            .findings.append(AuditFinding(
                finding_id=,
                severity=,
                category=,
                title=,
                detail=,
                remediation=,
            ))
            .counter += 

         exposed

     ():
        
        ()

        
        
        checks = [
            {
                : ,
                : ,
                : ,
                : ,
            },
            {
                : ,
                : ,
                : ,
                : ,
            },
            {
                : ,
                : ,
                : ,
                : ,
            },
        ]

         check  checks:
            .findings.append(AuditFinding(
                finding_id=,
                severity=check[],
                category=,
                title=,
                detail=check[],
                remediation=check[],
            ))
            .counter += 

     ():
        
        ()

        integrity_checks = [
            AuditFinding(
                finding_id=,
                severity=,
                category=,
                title=,
                detail=,
                remediation=,
            ),
            AuditFinding(
                finding_id=,
                severity=,
                category=,
                title=,
                detail=,
                remediation=,
            ),
        ]
        .findings.extend(integrity_checks)
        .counter += (integrity_checks)

     ():
        
        report = []
        report.append( * )
        report.append()
        report.append()
        report.append()
        report.append( * )

         sev  [, , , ]:
            findings = [f  f  .findings  f.severity == sev]
             findings:
                report.append()
                 f  findings:
                    report.append()
                    report.append()
                    report.append()

         .join(report)


 __name__ == :
    target = sys.argv[]  (sys.argv) >   
    audit = HistorianSecurityAudit(target, )
    audit.check_network_exposure()
    audit.check_authentication()
    audit.check_data_integrity()
    (audit.generate_report())