Phase 8 Sprint 8.1 - Security Pipeline Architecture

Summary

Introduced a dedicated security enforcement workflow that blocks insecure telemetry changes before integration.

Threat Model

• CI pipeline is treated as a zero-trust control plane and must fail closed when mandatory security controls are weakened.

Attack Vectors Considered

• Pipeline bypass through disabled security jobs.
• Security control regression merged without dedicated gate validation.
• Dependency vulnerability drift.

Mitigations Implemented

• New security-enforcement.yml workflow with isolated jobs:
  • SAST.
  • Dependency scan.
  • Security regression tests and policy gate.
• Policy gate validates explicit secure runtime configuration and gateway guard presence.
• Workflow runs on sprint feature branches and integration PRs to prevent delayed detection.

Residual Risk

• Local pre-push validation is still optional; first detection may occur in remote CI.

Future Improvements

• Add pre-commit hook profile mirroring CI security gate.
• Add signed provenance attestation for workflow outputs.

Architecture Diagram

flowchart LR
  PR[Feature Branch / PR]
  WF[Security Enforcement Workflow]
  SAST[SAST - Bandit]
  DEP[Dependency Scan - pip-audit]
  GATE[Policy Gate + Security Tests]
  BLOCK[Fail Closed]
  PASS[Merge Eligible]

  PR --> WF
  WF --> SAST
  WF --> DEP
  WF --> GATE
  SAST --> BLOCK
  DEP --> BLOCK
  GATE --> BLOCK
  GATE --> PASS