feat(security): guard the per-consumer cosign matchers against the generated approved-revision set - #3557
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…nerated approved-revision set guard-publish-workflow-approved-revisions.sh reads the committed approved set and asserts that each registered consumer's shared-publish-workflow matcher pins exactly that consumer's (applied-signer|main-pin) pair; a revision outside the pair is refused in every mode (AC4 of #3308). The switch APPROVED_REVISIONS_ENFORCE is off by default so the pattern form still passes today; on, a per-consumer matcher left on the pattern form fails, which is what keeps the narrowing from reverting. The three generic subjects are excluded by name, and any shared-workflow subject that is neither attributed to a registered consumer nor listed fails the run. Records are newline-delimited strings rather than associative arrays so the guard runs on the maintainer's bash 3.2 as well as CI. The test builds a synthetic tree from the report's own consumer list and covers both switch states, every refusal by name, the approved-set shape checks, the scope boundary, the CI wiring, and the real tree with the switch off. Fixes #3551 Part of #3308 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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The test suite ( |
…ument, and skip nested worktrees Self-review found that matchOIDCIdentity is an OR-list: a wildcard or first-party-branch entry beside a correct pair admitted any signer while the guard reported form=set. The guard now reads the entry total as well as the shared-workflow count and requires both to be exactly one, and it requires the line scan that discovered the file to agree with the OCIRepository read so a subject in a second document cannot pass unjudged. Discovery excludes .git and .claude, because the maintainer's checkout carries nested per-session worktrees that made the guard refuse a correct tree. The lookup helper compares keys as strings. Tests add the wildcard-sibling, branch-sibling, two-shared, second-document, signer==pin (accepted and refused shapes), nested-worktree, malformed-pin, duplicate-row and eighth-field cases, and the wiring check also catches an inline APPROVED_REVISIONS_ENFORCE=1. The k8s filter no longer routes a regenerated set through the deploy matrix. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Exercised at this head: the guard exits 0 on the real tree with the switch off and refuses with the pair-naming fix with it on; run from the parent checkout carrying a nested session worktree it now passes too. Test suite: 39 cases, exit 0, on macOS bash 3.2. |
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🔇 Additional comments (3)
📝 WalkthroughWalkthroughThe pull request adds a fail-closed guard for per-consumer publish workflow cosign matchers. The guard validates the approved revision set, scans OCIRepository manifests, excludes generic subjects, and checks exact revision membership. Tests cover valid and invalid matcher forms, malformed inputs, missing resources, and enforcement modes. CI runs ShellCheck, the guard, and its tests. Merge Risk: 🟡 Moderate · up to The new CI guard may miss deployable OCIRepository matchers stored as .yml, potentially allowing unapproved workflow revisions. Confirm the deployment scope or cover both extensions before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The changes implement the requirements in Full details: Docstring CoverageExplanation Docstring coverage is 61.11% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 18 functions across 4 files. (1 skipped: 1 unsupported.) Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
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Inline comments:
In `@scripts/tests/test-publish-workflow-approved-revisions-guard.sh`:
- Line 126: Update the subjectRegExp fixtures in the unquoted heredocs at the
affected locations to emit a single escaped dot, matching the guard’s expected
subject pattern; apply this consistently to all three occurrences so every
document is discovered and exclusion behavior is tested.
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Configuration used: Repository YAML (base), Organization UI (inherited)
Review profile: ASSERTIVE
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Run ID: db3ff390-1f5b-4ea1-88ea-fe69122c8dd1
📒 Files selected for processing (5)
.github/workflows/ci.yamlscripts/generate-publish-workflow-approved-revisions.shscripts/guard-publish-workflow-approved-revisions.shscripts/guard-shared-publish-workflow-pin.shscripts/tests/test-publish-workflow-approved-revisions-guard.sh
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🧠 Learnings (1)
📚 Learning: 2026-08-10T13:01:12.782Z
Learnt from: devantler
Repo: devantler-tech/platform PR: 3057
File: .github/workflows/ci.yaml:622-659
Timestamp: 2026-08-10T13:01:12.782Z
Learning: Repository shell tests and scripts must remain compatible with macOS Bash 3.2. Do not use Bash 4+ features such as `mapfile`; use portable constructs, such as a `while IFS= read -r` loop, instead.
Applied to files:
scripts/tests/test-publish-workflow-approved-revisions-guard.shscripts/guard-publish-workflow-approved-revisions.sh
🔇 Additional comments (4)
scripts/generate-publish-workflow-approved-revisions.sh (1)
12-14: LGTM!scripts/guard-shared-publish-workflow-pin.sh (1)
53-54: LGTM!.github/workflows/ci.yaml (1)
114-127: LGTM!Also applies to: 333-337
scripts/guard-publish-workflow-approved-revisions.sh (1)
137-137: 🔒 Security & PrivacyDetermine whether
.ymlmanifests are supported.The repository contains no tracked
.ymlOCIRepository manifests or Kustomization references. Extend discovery only if.ymlis a supported reconciled-manifest extension.
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Evicted from the merge queue at 20:20Z on a transient, re-queuing at the same head Root-caused from the merge-group run (33801010665) rather than assumed: |
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Why
The shared publish workflows' cosign matchers are about to be narrowed from "any commit" to each consumer's approved revision pair, and nothing today checks that a narrowed matcher names the pair the generated set actually holds. A hand edit or a stale regeneration could quietly widen a matcher back, or point it at a revision nobody approved, with every existing check still green.
What
Adds a CI guard that reads the committed approved-revision set and asserts each of the four per-consumer matchers pins exactly that consumer's pair, refusing any revision outside it. It ships behind a switch that is off by default: while off, today's pattern-form matchers still pass, so the guard is live now without forcing the narrowing; once on, a matcher left on the pattern form fails. The three generic subjects are excluded by name and stay as they are. Both switch states and every refusal are covered by the accompanying test.
Fixes #3551
Part of #3308