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git.stella-ops.org/docs/modules/evidence-locker/verify-offline.md
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Add sample proof bundle configurations and verification script 
- Introduced sample proof bundle configuration files for testing, including `sample-proof-bundle-config.dsse.json`, `sample-proof-bundle.dsse.json`, and `sample-proof-bundle.json`.
- Implemented a verification script `test_verify_sample.sh` to validate proof bundles against specified schemas and catalogs.
- Updated existing proof bundle configurations with new metadata, including versioning, created timestamps, and justification details.
- Enhanced evidence entries with expiration dates and hashes for better integrity checks.
- Ensured all new configurations adhere to the defined schema for consistency and reliability in testing.
2025-12-04 08:54:32 +02:00

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Offline Verification Playbook (EB9)

Purpose: allow auditors to validate Evidence Locker bundles without network access, using only POSIX tools. Applies to both sealed bundle.tgz and portable portable-bundle-v1.tgz.

Prerequisites

  • tar, sha256sum (or shasum), awk, base64.
  • Optional: jq for schema validation; cosign or stella CLI for DSSE verification if pre-loaded.

Quick steps (sealed bundle)

  1. tar -xzf bundle.tgz -C /tmp/bundle
  2. cd /tmp/bundle
  3. Validate checksums: sha256sum -c checksums.txt
  4. Derive Merkle root (matches DSSE subject): sha256sum checksums.txt | awk '{print $1}'
  5. Validate manifest against schema (if jq present): jq -e 'input | type=="object"' manifest.json >/dev/null
  6. Verify DSSE envelope (optional but recommended):
    • cat manifest.json | base64 | cosign verify-blob --key cosign.pub --bundle signature.json --bundleType dsse
    • or stella evidence verify --bundle ../bundle.tgz --offline once CLI supports offline mode.

Quick steps (portable bundle)

Same as sealed, plus confirm redaction:

  • jq -e 'has(\"redaction\") and .redaction.portable==true' manifest.json >/dev/null (if jq available)
  • Confirm no tenant identifiers in bundle.json and manifest.json.

Embeddable verifier script

Place the following script into verify-offline.sh when assembling portable bundles. It exits non-zero on any mismatch and prints the Merkle root used as DSSE subject.

#!/usr/bin/env bash
set -euo pipefail
BUNDLE="${1:-bundle.tgz}"
WORKDIR="$(mktemp -d)"
cleanup() { rm -rf "$WORKDIR"; }
trap cleanup EXIT
tar -xzf "$BUNDLE" -C "$WORKDIR"
cd "$WORKDIR"
sha256sum -c checksums.txt
MERKLE=$(sha256sum checksums.txt | awk '{print $1}')
printf "merkle_root=%s\n" "$MERKLE"
if command -v jq >/dev/null; then
  jq -e 'type=="object" and has("entries")' manifest.json >/dev/null
fi

Fixtures

  • Golden bundles and replay records live under tests/EvidenceLocker/Bundles/Golden/.
  • Expected Merkle roots and DSSE payload digests should be recorded alongside each fixture to keep CI deterministic.

References

  • Manifest schema: docs/modules/evidence-locker/schemas/bundle.manifest.schema.json
  • Checksums schema: docs/modules/evidence-locker/schemas/checksums.schema.json
  • Merkle recipe: see docs/modules/evidence-locker/bundle-packaging.md