Cloud Security Foundations ========================== Purpose ------- This document describes the **baseline cloud security foundations** required to operate secure, compliant, and resilient workloads in public cloud environments. The focus is on **repeatable architecture and governance**, not individual security tools. These foundations form the control layer upon which Secure Software Lifecycle (SSLM), vulnerability management, CNAPP, and SOC operations depend. The reference implementation assumes **AWS**, but the principles are cloud-agnostic. --- Why Cloud Security Foundations Matter ------------------------------------- Many organisations adopt cloud services faster than they establish governance. Common symptoms include: - Inconsistent account structures - Weak identity boundaries - Fragmented logging and monitoring - Manual security reviews - Unclear shared-responsibility ownership For regulated organisations, these gaps translate directly into **audit findings, customer assurance failures, and operational risk**. Cloud security foundations exist to make security **predictable, observable, and provable**. --- Design Principles ----------------- Thinkwerke foundations are built around the following principles: - Security by default, not by exception - Centralised visibility with decentralised ownership - Automation over manual review - Clear separation of duties - Evidence generation as a first-class requirement --- Core Foundation Components -------------------------- ### 1. Account and Environment Structure A structured multi-account model is used to separate: - Production and non-production workloads - Shared services (logging, security tooling) - Management and governance functions Benefits: - Reduced blast radius - Clear ownership boundaries - Stronger auditability --- ### 2. Identity and Access Management (IAM) Identity is treated as the primary security control. Key elements include: - Centralised identity provider integration - Role-based access with least privilege - No long-lived credentials - Strong separation between human and machine identities Access decisions are **traceable and reviewable**, supporting ISO 27001 and NIS2 requirements. --- ### 3. Network Security Baseline The network layer provides controlled connectivity without becoming a bottleneck. Typical controls include: - Segmented VPC design - Restricted ingress and egress paths - Private service access where possible - Explicit trust boundaries between services Network design is documented and mapped to control objectives. --- ### 4. Logging and Monitoring Foundations All security and operational decisions depend on **reliable telemetry**. Foundational logging includes: - Cloud API activity - Identity and access events - Network flows - Platform and service logs Logs are: - Centralised - Immutable - Retained according to regulatory requirements This layer enables SOC, SIEM, and incident response workflows. --- ### 5. Posture Management (CSPM) Cloud Security Posture Management provides continuous visibility into: - Configuration drift - Policy violations - Exposure risks - Control coverage Posture findings are integrated into the broader vulnerability and governance lifecycle, not handled in isolation. --- ### 6. Secure CI/CD Integration Cloud foundations extend into delivery pipelines. This includes: - Secure identity for pipelines - Controlled deployment permissions - Infrastructure-as-Code validation - Traceable change history Every deployment becomes **auditable by design**. --- Operating Model --------------- Security foundations are effective only when paired with an operating model. Key responsibilities include: - Platform ownership (cloud teams) - Control ownership (security and compliance) - Application ownership (engineering teams) - Oversight and assurance (GRC or risk functions) Roles are explicitly defined to avoid ambiguity during incidents or audits. --- Evidence and Audit Readiness ---------------------------- Foundations are designed to generate continuous evidence, including: - Identity and access records - Configuration baselines - Logging coverage - Change and deployment history This evidence supports: - ISO 27001 certification and surveillance audits - NIS2 compliance demonstrations - CRA technical documentation - Customer security assessments --- Relationship to Other Solutions ------------------------------- Cloud security foundations enable and support: - :doc:`secure-software-lifecycle` - :doc:`vulnerability-lifecycle` - :doc:`cnapp-kubernetes` - :doc:`soc-siem-modernisation` Without strong foundations, higher-level security controls become fragile. --- Compliance Mapping ------------------ This solution supports: - **ISO/IEC 27001** - A.5.15 Identity management - A.8.15 Logging - A.8.23 Network security - **NIS2** - Risk management measures - Incident detection and response readiness - **CRA** - Secure-by-design infrastructure - Operational resilience requirements --- Key Takeaway ------------ Cloud security foundations are not a one-time setup. They are a **living control layer** that enables speed, resilience, and trust across the entire software and cloud lifecycle.