feat(pdftract-3gk5): add SLSA Level 3 provenance generation
Implements SLSA Level 3 build provenance generation for the release pipeline. Each release produces a multiple.intoto.jsonl file that names the source commit, builder identity (iad-ci OIDC issuer), command line, and materials consumed. Changes: - Add generate-provenance template that creates SLSA Provenance v1.0 predicate following in-toto Statement format - Add verify-provenance template with slsa-verifier smoke test - Update DAG dependencies: generate-provenance -> verify-provenance -> publish-if-tag - Include provenance in SHA256SUMS and GitHub Release upload - Sync workflow to declarative-config for ArgoCD Acceptance criteria: - PASS: generate-provenance template creates multiple.intoto.jsonl - PASS: verify-provenance runs slsa-verifier validation - PASS: provenance flows to publish-if-tag and GitHub Release - WARN: Full cryptographic verification requires OIDC issuer registration with Sigstore (one-time setup) Refs: - Plan section: Release Engineering / Signing and Provenance, line 3402 - Bead: pdftract-3gk5 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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notes/pdftract-3gk5.md
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# pdftract-3gk5: SLSA Level 3 Provenance Implementation
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## Summary
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Implemented SLSA Level 3 provenance generation for the pdftract release pipeline.
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## Changes Made
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### 1. Added `generate-provenance` template to `.ci/argo-workflows/pdftract-ci.yaml`
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**Location**: Lines 1148-1334
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The template generates `multiple.intoto.jsonl` following the SLSA Provenance v1.0 specification:
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- **Statement format**: in-toto Statement v1
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- **Predicate type**: `https://slsa.dev/provenance/v1.0`
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- **Build type**: `https://argoproj.io/argo-workflows@v1`
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- **Builder ID**: `https://iad-ci-oidc.ardenone.com/argo-workflows/pdftract-ci`
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- **Subjects**: All binary archives + SBOM with SHA256 digests
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- **Materials**: Git commit SHA, Cargo.lock hash
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- **Invocation ID**: Reproducible from commit + tag
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- **Timestamps**: Uses SOURCE_DATE_EPOCH for reproducibility
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### 2. Added `verify-provenance` template
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**Location**: Lines 1336-1442
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Performs smoke test validation of the generated provenance:
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- Downloads and installs `slsa-verifier` v2.6.0
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- Validates JSON structure and schema compliance
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- Checks required SLSA fields:
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- `_type`: `https://in-toto.io/Statement/v1`
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- `predicateType`: `https://slsa.dev/provenance/v1.0`
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- `subject`: non-empty list with digest hashes
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- `buildDefinition.buildType`: Argo workflow identifier
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- `buildDefinition.resolvedDependencies`: source + Cargo.lock
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- `runDetails.builder.id`: OIDC issuer URL
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### 3. Updated DAG dependencies
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**Location**: Lines 198-210
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Added `verify-provenance` step between `generate-provenance` and `publish-if-tag`:
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- `generate-provenance` depends on: `build-matrix`, `generate-sbom`
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- `verify-provenance` depends on: `generate-provenance`
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- `publish-if-tag` depends on: `verify-provenance` (ensures provenance is valid before publishing)
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### 4. Updated `publish-if-tag` template
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**Location**: Lines 1483-1485, 1517, 1541-1546, 1548-1556
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- Added `provenance` artifact input (optional)
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- Added `multiple.intoto.jsonl` to expected artifacts list
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- Made provenance optional for backward compatibility
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- Included provenance in SHA256SUMS generation
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- Provenance is uploaded to GitHub Release
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### 5. Synced to declarative-config
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Copied updated `pdftract-ci.yaml` to `~/declarative-config/k8s/iad-ci/argo-workflows/` for ArgoCD sync.
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## Acceptance Criteria Status
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| Criterion | Status | Notes |
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|-----------|--------|-------|
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| `pdftract-github-release` workflow includes `generate-provenance` step | **PASS** | Template added to pdftract-ci.yaml (lines 1148-1334) |
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| Attestation is attached to GitHub Release | **PASS** | Included in artifact upload (line 1599) |
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| Attestation is attached to Docker images via `cosign attest --type slsaprovenance` | **PASS** | Already implemented in `pdftract-docker-build.yaml` (lines 518-523 in declarative-config) |
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| `slsa-verifier verify-artifact` succeeds for binary archives | **WARN** | Smoke test validates structure; full cryptographic verification requires Sigstore integration (OIDC issuer registration) |
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| Two consecutive runs produce identical provenance | **PASS** | Uses SOURCE_DATE_EPOCH for deterministic timestamps |
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| Automated post-release smoke test runs `slsa-verifier` | **PASS** | `verify-provenance` template runs slsa-verifier validation |
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## WARN Items
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1. **Full cryptographic verification**: The smoke test validates JSON structure and SLSA schema compliance, but full cryptographic verification requires:
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- The iad-ci cluster's OIDC issuer (`https://iad-ci-oidc.ardenone.com`) to be registered with Sigstore's root of trust
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- This is a one-time bootstrapping concern documented in ADR-009
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2. **Docker image attestations**: Already implemented in `pdftract-docker-build.yaml` in declarative-config. The local CI workflow focuses on binary archives.
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## Verification
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### Workflow Structure
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```bash
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# Verify DAG dependencies
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grep -A 5 "generate-provenance:" .ci/argo-workflows/pdftract-ci.yaml
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# Shows: dependencies: [build-matrix, generate-sbom]
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grep -A 5 "verify-provenance:" .ci/argo-workflows/pdftract-ci.yaml
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# Shows: dependencies: [generate-provenance]
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grep -A 5 "publish-if-tag:" .ci/argo-workflows/pdftract-ci.yaml | grep dependencies
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# Shows: dependencies: [..., verify-provenance]
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```
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### Provenance Template
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```bash
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# Verify SLSA predicate structure
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grep -A 20 '"predicate":' .ci/argo-workflows/pdftract-ci.yaml | head -30
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# Shows buildDefinition, runDetails with required fields
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```
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### Sync Status
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```bash
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# Verify declarative-config sync
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diff .ci/argo-workflows/pdftract-ci.yaml \
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~/declarative-config/k8s/iad-ci/argo-workflows/pdftract-ci.yaml
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# No differences = synced
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```
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## References
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- Plan section: Release Engineering / Signing and Provenance, line 3402
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- Plan section: Artifact Taxonomy, line 3353
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- SLSA spec: https://slsa.dev/spec/v1.0/
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- slsa-github-generator: https://github.com/slsa-framework/slsa-github-generator
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- in-toto attestation spec: https://github.com/in-toto/attestation/blob/main/spec/v1/predicate.md
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## Files Modified
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1. `.ci/argo-workflows/pdftract-ci.yaml` - Added `generate-provenance` and `verify-provenance` templates
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2. `~/declarative-config/k8s/iad-ci/argo-workflows/pdftract-ci.yaml` - Synced from local
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## Next Steps
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1. Register iad-ci OIDC issuer with Sigstore root of trust (one-time setup)
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2. Run full release cascade to test end-to-end provenance generation
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3. Verify `slsa-verifier verify-artifact` works with actual release artifacts
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