Specialized Cyber Defense & Operational Agents
Problem Statement
Zero Trust Policy Decision Points (PDPs) evaluate access requests based on context (device posture, user identity, network location, time). Static RBAC rules cannot handle multi-variable contextual evaluation, leading to overly rigid or permissive access decisions.
Goal
Deploy an agentic Policy Decision Point (PDP) that dynamically evaluates access requests against real-time contextual risk signals.
Outcome Measurement
- Zero Trust Enforcement: 100% block rate on untrusted device access requests to sensitive internal resources.
- User Experience: Seamless access approval for authenticated, low-risk requests.
How the Code was Built
Evaluates multi-factor risk state inside a structured decision matrix.
Executable Code
from pydantic import BaseModel, Fieldfrom langchain_openai import ChatOpenAIclass ZeroTrustPolicyDecision(BaseModel): access_granted: bool trust_score: float enforced_mitigations: list[str] = Field(description="MFA_REAUTHENTICATE, STEP_UP_AUTH, STEP_DOWN_PRIVILEGES, DENY") reasoning: strdef evaluate_zero_trust_access(user_role: str, device_is_managed: bool, disk_encrypted: bool, access_location: str, resource_sensitivity: str) -> ZeroTrustPolicyDecision: llm = ChatOpenAI(model="gpt-4o", temperature=0) structured_llm = llm.with_structured_output(ZeroTrustPolicyDecision) prompt = f""" Evaluate Zero Trust Access Request: User Role: {user_role} Managed Device: {device_is_managed} Disk Encrypted: {disk_encrypted} Location: {access_location} Target Resource: {resource_sensitivity} """ return structured_llm.invoke(prompt)if __name__ == "__main__": res = evaluate_zero_trust_access( user_role="Database Administrator", device_is_managed=False, disk_encrypted=False, access_location="Public Coffee Shop Wi-Fi", resource_sensitivity="Production Customer PII Database" ) print(f"Access Granted: {res.access_granted}") print(f"Trust Score: {res.trust_score}") print(f"Enforced Actions: {res.enforced_mitigations}") print(f"Reasoning: {res.reasoning}")






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