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Source Code in ISO 27001

Source Code in ISO 27001

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This curriculum spans the equivalent of a multi-workshop technical governance program, addressing source code as a controlled information asset across ownership, access, development, third-party, and audit contexts typical in regulated software environments.

Module 1: Defining Source Code as an Information Asset in the ISMS

  • Determine whether source code repositories are classified as confidential, internal, or public based on business impact and licensing terms.
  • Map ownership of source code assets across development teams, third-party vendors, and open-source contributors.
  • Integrate source code into the organization’s asset inventory with attributes such as location, sensitivity, and retention period.
  • Establish criteria for identifying critical source code components requiring enhanced protection under A.8.1.1.
  • Define retention periods for source code branches, tags, and archived repositories in alignment with legal and compliance obligations.
  • Document exceptions where source code is excluded from the ISMS scope, including justification and risk acceptance.
  • Assign custodianship roles for source code repositories to ensure accountability in backup, access, and decommissioning.
  • Conduct asset valuation exercises to prioritize protection efforts based on business continuity and intellectual property exposure.

Module 2: Access Control Policies for Source Code Repositories

  • Implement role-based access control (RBAC) for Git platforms (e.g., GitHub, GitLab, Bitbucket) aligned with job functions.
  • Enforce least privilege by default, requiring justification for elevated permissions such as admin or force-push rights.
  • Define separation of duties between developers, reviewers, and release managers in pull request workflows.
  • Integrate repository access with centralized identity providers (e.g., SSO via SAML or OIDC) to enable auditability.
  • Establish automated access reviews for source code repositories on a quarterly basis with documented approvals.
  • Restrict direct commits to main branches; mandate code review and merge request approvals per A.9.2.3.
  • Implement time-bound access grants for contractors and external contributors using JIT (just-in-time) provisioning.
  • Enforce multi-factor authentication (MFA) for all users accessing source code hosting platforms.

Module 3: Secure Development Environment Configuration

  • Standardize development workstation configurations with encrypted storage and endpoint detection tools.
  • Prohibit local storage of sensitive source code outside approved version control systems.
  • Configure IDEs to prevent automatic upload of code snippets to public cloud-based assistants or snippets repositories.
  • Isolate development, staging, and production environments with network segmentation and firewall rules.
  • Enforce use of signed commits and GPG keys to ensure developer identity verification.
  • Disable unsecured protocols (e.g., HTTP, FTP) for repository synchronization; mandate HTTPS and SSH.
  • Implement pre-commit hooks to block inclusion of secrets, credentials, or hardcoded keys in source files.
  • Define baseline security tooling (e.g., SAST, dependency scanners) required in local and CI environments.

Module 4: Third-Party and Open-Source Code Governance

  • Establish an approved list of open-source licenses and maintain a policy for license compliance reviews.
  • Conduct vulnerability scanning of open-source dependencies using SBOMs and tools like OWASP Dependency-Check.
  • Require legal review for any incorporation of third-party code exceeding defined thresholds (e.g., >500 lines).
  • Maintain an inventory of all open-source components used across projects with version and patch status.
  • Define ownership for monitoring and updating third-party libraries with known CVEs.
  • Prohibit use of unmaintained or end-of-life open-source projects in production codebases.
  • Implement automated policy enforcement in CI/CD pipelines to block builds with unapproved dependencies.
  • Document use of dual-licensed or copyleft components that may impose redistribution obligations.

Module 5: Change and Release Management Integration with ISO 27001

  • Enforce mandatory change records for all production deployments, linked to corresponding merge requests.
  • Require risk assessment documentation for emergency code deployments bypassing standard change controls.
  • Integrate source code tagging with release management systems to ensure traceability from commit to deployment.
  • Define rollback procedures and version freeze periods during critical operations or audits.
  • Restrict deployment permissions to authorized release engineers or automated pipelines.
  • Log all deployment activities with timestamps, user identities, and affected systems for audit purposes.
  • Conduct post-release reviews to validate that deployed code matches approved and tested versions.
  • Enforce code freeze windows during financial closing, audits, or major system migrations.

Module 6: Source Code Backup, Retention, and Disposal

  • Define backup frequency and geographic redundancy for source code repositories based on RPO and RTO.
  • Encrypt repository backups at rest and in transit using organization-approved cryptographic standards.
  • Validate backup integrity through periodic restore testing of full repository snapshots.
  • Establish retention schedules for inactive branches, forks, and deprecated repositories.
  • Document secure disposal procedures for source code data on decommissioned systems or storage media.
  • Ensure backups are excluded from public indexing and stored in access-controlled environments.
  • Implement immutable backups for critical repositories to prevent tampering or ransomware deletion.
  • Verify that third-party code hosting providers comply with organizational backup and recovery SLAs.

Module 7: Monitoring, Logging, and Incident Response for Code Repositories

  • Enable audit logging for all repository events: pushes, deletions, permission changes, and merges.
  • Forward logs from Git platforms to a centralized SIEM with correlation rules for suspicious activity.
  • Define thresholds for anomalous behavior, such as bulk deletions or mass cloning from a single IP.
  • Integrate repository alerts with incident response playbooks for compromised credentials or data leaks.
  • Conduct forensic readiness assessments to ensure logs retain sufficient detail for post-incident analysis.
  • Test incident response procedures for source code theft or unauthorized public exposure annually.
  • Preserve chain of custody for repository data during investigations involving intellectual property disputes.
  • Monitor for unauthorized forks or public mirrors of internal repositories using web crawlers or takedown services.

Module 8: Secure Coding Policy Alignment with A.8.2 and A.14.2

  • Define mandatory secure coding standards (e.g., input validation, error handling) per language and framework.
  • Integrate static application security testing (SAST) into CI pipelines with fail-on-critical findings.
  • Require peer code reviews focused on security anti-patterns and compliance with coding guidelines.
  • Document exceptions for temporary non-compliance with secure coding rules, including risk justification.
  • Enforce secure configuration of build scripts and CI runners to prevent dependency confusion attacks.
  • Train development teams on common vulnerabilities (e.g., CWE Top 25) relevant to their codebase.
  • Map secure coding controls to specific ISO 27001 Annex A controls for audit traceability.
  • Conduct periodic code quality and security health assessments using automated metrics and dashboards.

Module 9: Audit Readiness and Evidence Management for Source Code

  • Prepare repository access logs, change records, and approval trails for external ISO 27001 certification audits.
  • Generate evidence packs demonstrating compliance with specific controls (e.g., A.9.2.3, A.14.2.8).
  • Validate that all source code repositories in scope are included in the Statement of Applicability (SoA).
  • Reconcile repository permissions against HR records to identify orphaned or excessive access.
  • Archive audit-relevant metadata (e.g., pull request approvals, scan results) for the required retention period.
  • Respond to auditor findings by implementing corrective actions with documented closure dates.
  • Conduct internal readiness assessments simulating certification audit interviews for development leads.
  • Ensure all outsourced development activities are included in audit scope with evidence of oversight.

Module 10: Governance of Developer Productivity Tools and Integrations

  • Assess security configurations of CI/CD tools (e.g., Jenkins, GitHub Actions) for credential exposure risks.
  • Restrict use of personal access tokens in automation; mandate short-lived credentials or managed identities.
  • Review and approve integrations between source code platforms and third-party services (e.g., Slack, Jira).
  • Enforce encryption and access logging for any code analysis tools processing source in external systems.
  • Define ownership for maintaining security of shared pipelines, templates, and deployment scripts.
  • Conduct periodic access reviews for service accounts used in CI/CD workflows.
  • Disable unused or deprecated webhooks and integrations to reduce attack surface.
  • Implement network controls to restrict outbound connections from build agents to approved domains only.
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