azure-security-framework

Azure security architecture: controls, policies, and reference designs aligned to Microsoft Cloud Security Benchmark, CAF, and Zero Trust.

Built by a Cybersecurity Architect implementing Azure security at enterprise scale. This repository documents real-world security controls, not theoretical frameworks.

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Purpose

This repository is an Azure security reference architecture covering the key domains that matter in enterprise cloud deployments: identity security, network controls, data protection, DevSecOps pipelines, and compliance posture.

Everything here is based on real implementation decisions made in production Azure environments — including the trade-offs, constraints, and lessons learned.

What this is not: A tutorial. A copy-paste of Microsoft documentation. A feature list.

What this is: An architect's working reference for building defensible Azure environments.

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Problem Statement

Azure provides hundreds of security controls. Most organizations implement 30–40% of them. The gap is not knowledge — it is architecture decision-making:

• Which controls matter most for your threat model?
• • Which Azure Policy definitions should you enforce vs. audit?

  • • How do you balance security with developer velocity?

    • • What does Zero Trust actually mean in an Azure context beyond marketing?

      • This repository answers those questions with concrete implementations.

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Repository Structure

azure-security-framework/
├── identity/
│   ├── conditional-access-policies.md   # Zero Trust identity controls
│   ├── privileged-identity-management.md # PIM design decisions
│   └── managed-identities-guide.md      # Eliminating credentials at scale
├── network/
│   ├── hub-spoke-architecture.md        # Reference network topology
│   ├── private-endpoints-design.md      # PaaS security without public exposure
│   └── nsg-design-principles.md         # NSG rules that scale
├── data-protection/
│   ├── encryption-at-rest.md            # Key Vault, BYOK, CMK
│   ├── data-classification.md           # Microsoft Purview integration
│   └── storage-security.md              # Blob, ADLS, SQL security controls
├── devsecops/
│   ├── pipeline-security.md             # Azure DevOps / GitHub Actions hardening
│   ├── container-security.md            # AKS security baseline
│   └── iac-security-scanning.md         # Checkov, tfsec, Defender for DevOps
├── compliance/
│   ├── azure-policy-library.md          # Custom + built-in policy assignments
│   ├── mcsb-control-mapping.md          # Microsoft Cloud Security Benchmark
│   └── defender-for-cloud-posture.md    # CSPM configuration and remediation
└── README.md

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Architecture

Security Domain Coverage

Domain	Coverage	Key Controls	Status
Identity & Access	Zero Trust Identity	Conditional Access, PIM, Managed Identities	🗓️ In Progress
Network Security	Defense in Depth	Hub-Spoke, Private Endpoints, NSG	🗓️ In Progress
Data Protection	Encrypt Everything	Key Vault, CMK, Microsoft Purview	🗓️ In Progress
DevSecOps	Shift Left	Pipeline scanning, IaC security, container hardening	🗓️ In Progress
Compliance & Posture	Continuous Compliance	Azure Policy, MCSB, Defender for Cloud	🗓️ In Progress

Core Design Principles

Every control in this repository is evaluated against four principles:

1. Assume Breach — Design controls that limit blast radius, not just prevent initial compromise
2. 2. Verify Explicitly — Never trust location, network, or service identity alone
   3. 3. Least Privilege — Just-Enough-Access, Just-In-Time access for all identities

      4. 4. Defense in Depth — Multiple independent controls; no single point of failure

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         6. Design Decisions

         7. Why Managed Identities Over Service Principals with Secrets

Service principal secrets expire, get rotated inconsistently, and end up in source code. Managed identities eliminate the credential lifecycle problem entirely. This repository documents the migration patterns and the edge cases where service principals are still required.

Why Private Endpoints Over Service Endpoints

Service endpoints extend the VNet boundary but the service still has a public endpoint that can be accessed from other networks. Private endpoints inject the service into your VNet with a private IP. The operational overhead is worth it for any service handling sensitive data.

Why Azure Policy Audit Before Enforce

Enforcing policies in production without understanding the blast radius causes service disruptions. The pattern documented here: audit first (4 weeks), review non-compliant resources, create exemptions for legitimate exceptions, then enforce. Skip this and you will break production.

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Security Considerations

• All ARM templates and Bicep files in this repository should be scanned with Checkov or tfsec before deployment
• • Azure Policy definitions marked as Enforce have been validated in non-production environments first
  • • Conditional Access policies require careful baseline testing — always use Report-Only mode first

    • • Network changes (NSG rules, Private Endpoint creation) should be peer-reviewed before deployment

      • • Key Vault configurations documented here follow the principle of no public network access by default

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Implementation Notes

This repository is documentation-first, not code-first. The rationale:

Most Azure security failures are not technical failures — they are architecture and decision failures. A well-documented wrong decision is more dangerous than undocumented correct code. Every section documents the why, not just the what.

Code samples (Bicep, ARM, PowerShell, KQL) will be added alongside the architectural documentation as the repository grows.

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Author

Surya | Cybersecurity Architect | CISSP

Specializing in Azure Security, Microsoft Sentinel, and Cloud Security Architecture.

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References

• Microsoft Cloud Security Benchmark
• • Azure Cloud Adoption Framework — Security
  • • Zero Trust Guidance for Azure
    • • Defender for Cloud Documentation
      • • Azure Well-Architected Framework — Security Pillar