LangChain Agent Micro-segmentation — AI Agent

LangChain Micro-segmentation

LangChain Agent Micro-segmentation AI Network Security Zero Trust Policy Automation ReAct GPT-4 Cilium Calico VMware NSX Lateral Movement Prevention

LangChain Agent Setup

=== LangChain Security Agent ===

pip install langchain langchain-openai

from langchain.agents import AgentExecutor, create_react_agent

from langchain_openai import ChatOpenAI

from langchain.tools import Tool

from langchain.prompts import PromptTemplate

# Tools for Network Security

"""Analyze network traffic patterns"""

# Query traffic database

return f"Traffic analysis: {query}"

"""Create Kubernetes NetworkPolicy"""

# Generate and apply policy

return f"Policy created: {spec}"

"""Check security compliance"""

# Verify policies

return f"Compliance check: {namespace}"

"""Block suspicious IP address"""

# Add to blocklist

return f"Blocked: {ip}"

tools = [

Tool(name="TrafficAnalyzer", func=analyze_traffic,

เนื้อหาเกี่ยวข้อง — แนะนำให้อ่าน Computer Vision YOLO Blue Green Canary Deploy

description="Analyze network traffic patterns and anomalies"),

Tool(name="PolicyCreator", func=create_policy,

description="Create Kubernetes NetworkPolicy YAML"),

Tool(name="ComplianceChecker", func=check_compliance,

description="Check namespace security compliance"),

Tool(name="IPBlocker", func=block_ip,

แนะนำเพิ่มเติม — อีบุ๊กการลงทุน SiamCafeBook

description="Block suspicious IP address"),

]

llm = ChatOpenAI(model="gpt-4o", temperature=0)

agent = create_react_agent(llm, tools, prompt)

executor = AgentExecutor(agent=agent, tools=tools, verbose=True)

# Example: Auto-analyze and create policy

result = executor.invoke({

"input": "Analyze traffic for namespace 'payment' and create "

"micro-segmentation policy allowing only required connections"

})

from dataclasses import dataclass

@dataclass

class AgentTool:

name: str

function: str

input_type: str

เนื้อหาเกี่ยวข้อง — แนะนำให้อ่าน Prometheus Federation SSL TLS Certificate

output: str

risk_level: str

agent_tools = [

AgentTool("TrafficAnalyzer", "วิเคราะห์ Traffic Pattern", "Namespace/Pod", "Traffic Report", "Low"),

AgentTool("PolicyCreator", "สร้าง NetworkPolicy", "Policy Spec", "YAML Applied", "Medium"),

AgentTool("ComplianceChecker", "ตรวจ Compliance", "Namespace", "Compliance Score", "Low"),

AgentTool("IPBlocker", "Block IP ที่น่าสงสัย", "IP Address", "Block Confirmed", "High"),

AgentTool("LogAnalyzer", "วิเคราะห์ Security Log", "Time Range", "Threat Report", "Low"),

AgentTool("VulnScanner", "Scan Vulnerabilities", "Target", "CVE List", "Medium"),

]

แนะนำเพิ่มเติม — ดูสัญญาณเทรดที่ XM Signal

Kubernetes Network Policy

=== Micro-segmentation with Cilium ===

Kubernetes NetworkPolicy — Deny All Default

apiVersion: networking.k8s.io/v1

kind: NetworkPolicy

metadata:

name: default-deny-all

namespace: payment

spec:

podSelector: {}

policyTypes:

• Ingress
• Egress

Allow specific traffic — Payment Service

เนื้อหาเกี่ยวข้อง — กตล คืออะไร — ตลาดหลักทรัพย์แห่งประเทศไทย บทบาทสำคัญ 2026

apiVersion: networking.k8s.io/v1

kind: NetworkPolicy

metadata:

name: allow-payment-api

namespace: payment

spec:

podSelector:

matchLabels:

app: payment-api

policyTypes:

• Ingress
• Egress

ingress:

• from:
• namespaceSelector:

matchLabels:

name: frontend

• podSelector:

matchLabels:

app: checkout

ports:

• protocol: TCP

port: 8080

egress:

• to:
• podSelector:

matchLabels:

app: payment-db

ports:

• protocol: TCP

port: 5432

• to:
• ipBlock:

cidr: 0.0.0.0/0

ports:

• protocol: TCP

port: 443 # Stripe API

Cilium L7 Policy — HTTP Method Filtering

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

name: payment-l7

spec:

endpointSelector:

matchLabels:

app: payment-api

ingress:

• fromEndpoints:
• matchLabels:

app: checkout

toPorts:

• ports:
• port: "8080"

rules:

http:

• method: POST

path: "/api/v1/charge"

• method: GET

path: "/api/v1/status/.*"

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@dataclass

class SegmentPolicy:

namespace: str

service: str

allowed_ingress: str

allowed_egress: str

l7_filter: bool

status: str

policies = [

SegmentPolicy("payment", "payment-api", "checkout only", "payment-db + Stripe", True, "Enforced"),

SegmentPolicy("payment", "payment-db", "payment-api only", "None (isolated)", False, "Enforced"),

SegmentPolicy("frontend", "web-app", "ALB ingress", "api-gateway", False, "Enforced"),

SegmentPolicy("backend", "api-gateway", "web-app + mobile", "All backend services", True, "Enforced"),

SegmentPolicy("monitoring", "prometheus", "All namespaces (scrape)", "alertmanager", False, "Enforced"),

]

l7 = "L7" if p.l7_filter else "L3/L4"

เคล็ดลับ

• Default Deny: เริ่มจาก Deny All แล้วค่อย Allow
• L7: ใช้ Cilium L7 Policy กรอง HTTP Method Path
• AI: ใช้ LangChain Agent วิเคราะห์ Traffic แนะนำ Policy
• Human-in-loop: AI แนะนำ แต่คนอนุมัติ High-risk Policy
• Monitor: ใช้ Hubble ดู Traffic Real-time ทุก Namespace

LangChain Agent คืออะไร

AI Agent LLM ตัดสินใจ Tool ReAct คิด-ทำ-สังเกต API Database Search GPT-4 Claude Autonomous วิเคราะห์ Network สร้าง Policy อัตโนมัติ