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Sprint 12 Engineering Log

Program Context

• Phase: Phase 4
• Sprint: Sprint 12
• Status: Completed
• Primary Architecture Layers: Universal Runner, Cryptographic Verification, Sandbox Execution

Architectural Intent

Build the Universal Edge Runner as a cryptographically enforced Go execution path that only runs approved Armory artifacts under isolated sandbox controls.

Implementation Detail

• Added Go runner module (src/runner-go) with:
  • compact JWS verification (VerifyHS256JWS),
  • execution output -> CloudEvents mapping (MapToCloudEvent),
  • sandbox command contract and execution wrapper.
• Implemented local JWS verification logic:
  • HS256 verification path for deterministic QA and CI validation.
• Implemented signed-tool retrieval policy:
  • runner resolves only authorized Armory digests,
  • digest mismatch or missing authorization raises hard failure.
• Implemented sandbox command contract:
  • --runtime=runsc (gVisor runtime target),
  • AppArmor security profile pinning,
  • read-only, no-capabilities, no-network defaults.
• Implemented execution output contract:
  • captures stdout, stderr, exit_code,
  • maps to CloudEvents v1.0 payload including manifest_jws, tenant_id, and task metadata.

Security and Control Posture

• Runner enforces deny-by-default on missing/invalid signatures and unauthorized digests.
• Tool retrieval and execution are strongly bound to signed manifest hash.
• Output telemetry keeps manifest linkage for non-repudiation traceability.

QA and Validation Evidence

• Added tests/unit/test_runner_jws_verify.py for signature verification and forged-token rejection.
• Added tests/unit/test_universal_edge_runner.py for digest authorization and CloudEvents execution contract mapping.

Risk Register

ES256 verification backend remains pluggable by design and is not hardwired to a single crypto runtime implementation in this sprint.

Forward Linkage

Sprint 13 executes adversarial QA cases for forged signatures, tampered digests, and telemetry contract integrity.

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