Policy Enforcement Point

The PEP acts as the inline choke point for all access requests, sitting directly in the data path between the subject and the resource. It intercepts traffic at the network layer, application layer, or both, ensuring no lateral movement occurs without explicit authorization.

• Terminates TLS connections for deep packet inspection
• Proxies requests to the resource after authorization
• Operates transparently without requiring client-side agents in some architectures

The PEP does not make authorization decisions itself. It offloads the decision logic to a separate Policy Decision Point (PDP) via a standardized protocol, typically using XACML or a RESTful interface. This separation of enforcement from decision-making is fundamental to zero-trust design.

• Sends subject attributes, resource attributes, and environmental context to the PDP
• Caches authorization decisions locally for performance
• Enforces session revocation when the PDP invalidates a prior decision

Before querying the PDP, the PEP gathers real-time contextual attributes about the access request. These attributes form the basis of dynamic, risk-based policy evaluation rather than relying on static network location.

• Collects user identity from federated identity providers via OAuth 2.0 or SAML
• Assesses device posture including patch level, encryption status, and endpoint detection
• Evaluates environmental signals such as geolocation, time of day, and network reputation

Unlike traditional perimeter firewalls that authenticate once and trust indefinitely, a PEP enforces continuous verification throughout the session lifecycle. If the risk profile changes mid-session, the PEP can terminate or step-up authentication.

• Monitors session behavior for anomalous patterns
• Enforces re-authentication triggers based on policy thresholds
• Maintains detailed access logs for every enforcement action

In modern software-defined networks, the PEP is deployed as a distributed component at the workload level, enforcing east-west traffic policies between individual containers, virtual machines, or functions. This eliminates the concept of a trusted internal network.

• Deployed as a sidecar proxy in Kubernetes service meshes
• Enforces identity-based policies between microservices
• Operates at Layer 7 to inspect application protocol semantics

Beyond simple allow/deny decisions, the PEP executes obligations returned by the PDP. These are mandatory actions that must be performed in conjunction with access, such as logging, masking, or consent capture.

• Redacts personally identifiable information from responses before delivery
• Injects cryptographic watermarks into accessed documents
• Triggers audit events to security information and event management systems

The management interface where security administrators author, version, and maintain the organization's access control policies. The PAP provides the single source of truth for policy definitions, which are then distributed to the PDP for evaluation. In sovereign cloud architectures, the PAP enforces jurisdictional constraints on where data can be accessed.

• Manages policy lifecycle: create, test, deploy, retire
• Integrates with CI/CD pipelines for compliance as code
• Supports role-based (RBAC) and attribute-based (ABAC) policy models

An authoritative source that provides the attributes and contextual data required for a policy decision. When a PEP intercepts a request, the PDP may query the PIP to retrieve user roles, device health scores, geolocation, or data classification tags. This enables truly context-aware access control.

• Sources include LDAP directories, CMDBs, and SIEM systems
• Feeds real-time risk signals into the authorization flow
• Critical for implementing jurisdictional data tagging in sovereign environments

A dynamic security monitoring framework that provides real-time visibility into device posture, vulnerability status, and user behavior. The CDM system feeds trust scores and device health telemetry to the PDP, allowing the PEP to deny access from compromised or non-compliant endpoints even after initial authentication.

• Monitors endpoint configuration drift and patch levels
• Integrates with Endpoint Detection and Response (EDR) tools
• Enables adaptive authentication based on real-time risk