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implementing-zero-trust-with-beyondcorp

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Deploys Google BeyondCorp Enterprise zero trust access using IAP, context-aware policies, device trust, and Access Context Manager for GCP resources and apps. Useful for securing internal applications without VPNs.

GCP

Python

security

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Last CommitApr 4, 2026

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Implementing Zero Trust with BeyondCorp

Overview

Google BeyondCorp Enterprise implements the zero trust security model by eliminating the concept of a trusted network perimeter. Instead of relying on VPNs and network location, BeyondCorp authenticates and authorizes every request based on user identity, device posture, and contextual attributes. Identity-Aware Proxy (IAP) serves as the enforcement point, intercepting all requests to protected resources and evaluating them against Access Context Manager policies. This skill covers configuring IAP for web applications, defining access levels based on device trust and network attributes, and auditing access policies for compliance.

When to Use

When deploying or configuring implementing zero trust with beyondcorp capabilities in your environment
When establishing security controls aligned to compliance requirements
When building or improving security architecture for this domain
When conducting security assessments that require this implementation

Prerequisites

Google Cloud project with BeyondCorp Enterprise license
IAP API enabled (iap.googleapis.com)
Access Context Manager API enabled (accesscontextmanager.googleapis.com)
GCP resources to protect (Compute Engine, App Engine, or GKE services)
Endpoint Verification deployed on managed devices
Python 3.9+ with google-cloud-iap library

Steps

Step 1: Enable IAP on Target Resources

Configure Identity-Aware Proxy on Compute Engine, App Engine, or HTTPS load balancer backends.

Step 2: Define Access Levels

Create Access Context Manager access levels based on IP ranges, device attributes (OS version, encryption, screen lock), and geographic location.

Step 3: Bind Access Policies

Apply access levels as IAP conditions to enforce context-aware access decisions on protected resources.

Step 4: Audit and Monitor

Query IAP audit logs, verify policy enforcement, and identify gaps in zero trust coverage.

Expected Output

JSON report containing IAP-protected resources, access level definitions, policy binding audit results, and zero trust coverage metrics.