fix(ci-security): #166 — pin the TruffleHog scanner by image digest by KbWen · Pull Request #402 · KbWen/agentic-os

KbWen · 2026-08-12T09:47:58Z

Closes backlog #166 (P1) and files #171. The TruffleHog SHA pin bound the wrapper action, not the binary that scans.

The defect

security.yml pinned trufflesecurity/trufflehog@<40-hex> and tests/ci/test_security_workflow.py machine-enforced that pin on AC-5's stated grounds — "semver tags are mutable and do not provide supply-chain immutability". But the step passed only extra_args, and the wrapper's action.yml declares version: default: "latest", threaded into docker run "${IMAGE}:${VERSION}".

The enforced control did not bind the artifact it was written to protect. Evidenced on main, not inferred — run 31288803917 at 44b2e33 (pre-bump) loaded the old action 00155c9d… and logged version: latest → Digest: sha256:aa821cf4… → "trufflehog_version": "3.96.0". main was executing a 3.96.0 scanner under a pin that read v3.95.8.

The fix: pinned by digest, not by tag

image: ghcr.io/trufflesecurity/trufflehog@sha256
version: "aa821cf4ace8861c7d096d83818cdf7bb9719028a52d37a52eaad44086a52577"

The wrapper composes "${IMAGE}:${VERSION}", so this split yields a content-addressed reference. Confirmed in this PR's own CI, not just asserted:

Status: Downloaded newer image for
  ghcr.io/trufflesecurity/trufflehog@sha256:aa821cf4ace8861c…
"trufflehog_version": "3.96.0"

test_ac5_trufflehog_scanner_pinned_by_digest reproduces that join and requires a digest form — immutability by construction, not agreement between two editable strings. Proven red by reverting to a tag reference. If upstream ever changes the join, the composed string stops being a valid reference and docker fails loudly rather than silently reverting to a tag.

An earlier design in this PR pinned an exact release tag (version: "3.96.0") guarded by a test asserting equality with the # vX.Y.Z comment. Withdrawn before merge — see below.

AC-3 was false too, and the root cause was upstream of it

AC-3 claimed a "full-history scan". The wrapper runs --since-commit <base> --branch <head> — push/PR range only. fetch-depth: 0 exists so the base commit resolves; it does not widen the scan, and test_ac3_checkout_full_depth only ever asserted the fetch depth.

Traced to its source rather than patched at the symptom: a Domain Decision whose rationale claimed the scan "catches pre-existing leaks introduced before the current PR". False when written, and it generated AC-3.

The false text is removed from the live spec, not struck through. Review argued that struck-through text still reads as live text to grep and to any agent loading the file — decisive in a repo whose primary consumer is an agent. Superseded wording now lives only in the new L2 log as [SUPERSEDED] entries: L1 carries current truth, L2 carries history. Two further contradictions the first pass missed are fixed the same way — a Non-goal that listed the PR-delta scan as out of scope when it is the shipped behaviour, and two claims that --only-verified bounds false positives.

Consequence now stated plainly: a credential introduced before the scanned range is not re-detected by CI.

The scanner blocked this PR — now backlog #171

The first push failed Secret Detection. Not because the pin was wrong, but because the scanner reported a verified Lob credential in the diff: the name of the test written to enforce the pin, which landed on exactly the 35 characters Lob's key pattern requires. The PR pinning the secret scanner was blocked by the secret scanner, on the name of the test enforcing the pin.

Three facts came out of it, all in #171:

--only-verified did not bound the false positive, though AC-3 states that is its purpose.
The scan walks each commit's diff across the range, not the net endpoint diff. Established by experiment: a follow-up rename left CI red though the three-dot diff was clean; only removing the introducing commit went green. That is why this branch is squashed. Commit messages are in scope too.
35 identifiers of the same shape already exist in the tree, latent because the scan is range-scoped. [Bug] Validator mis-flags ship-history archive as a Work Log missing Phase Summary #171 does not list them — quoting one would re-create the pattern in its own diff.

--exclude-detectors=lob is #171's preferred remedy and is deliberately not done here: weakening a detector does not belong in a PR whose subject is strengthening this scanner.

Reclassified quick-win → hotfix

state_machine.md:51 hard-blocks quick-win above 200 diff lines or 2 modules. This unit is 276 lines across 7 files and four modules, and its own Phase Summary said "three modules" while keeping the tier — which is the tell. Keeping quick-win is what let the review gate be skipped.

Reclassified through the documented mechanism: a structured Reclassification: record in the Drift Log plus a re-entered bootstrap receipt, which is what makes the second epoch legal (validate.sh:1541). Hotfix demands the REVIEWED + TESTED gates that were missing, without a handoff artifact that adds nothing to a bounded fix against an existing spec. The retroactive sequencing is recorded, not presented as a clean run.

Review

An independent review at 982ce7b returned NOT READY with eight findings — three P1. All eight adopted, none overruled. Two changed the shipped design; one is the governance violation above. The two that mattered most were established by experiment rather than argument:

a mutation swapping the wrapper SHA for the previous release's, leaving comment and input untouched, kept all 42 tests green — proving the comment-equality guard was not provenance;
a detached clone at the reviewed head produced validate.ps1 pass=100 warn=3 fail=0 skip=3, showing the recorded totals are machine-local. They are now labelled as such, with CI named as the replayable evidence.

Also corrected: the freshness tradeoff was mis-framed as "the trade AC-5 already claimed to have made" — withdrawn, since the deployed runtime resolved latest and was not paying it; it is newly incurred and now an ## Accepted Risks entry with owner, cadence and an emergency path. source_sha in the L2 log pointed at a commit where the file does not exist. #171 said 36 identifiers where the tree holds 35, with two mutually exclusive "preferred" remedies.

Scope

.github/workflows/security.yml · tests/ci/test_security_workflow.py · docs/specs/ci-security-scanning.md · docs/architecture/ci-security.log.md (new, AC-15 consolidation, owner-confirmed per ship.md:83 after verifying no lifecycle-frontmatter, token-ceiling or deploy-manifest impact) · docs/specs/_product-backlog.md

Evidence

CI green at head, including Secret Detection (TruffleHog), with the digest pull in the log.
57 passed across the affected suites; digest assertion proven red by reverting to a tag.
validate.sh and validate.ps1 both pass=118 warn=4 fail=0 skip=2 on this machine — not reproducible from a clean checkout, by design of the active-Work-Log checks; CI is the replayable evidence.

Rollback: revert this PR. The pin returns to wrapper-only and the spec's corrected claims revert to their false forms, so a revert should be paired with re-filing #166.

🤖 Generated with Claude Code

…he wrapper The AC-5 SHA pin bound the wrapper action, not the binary that scans. The composite step runs `docker run <image>:${VERSION}` and the wrapper's `version` input defaults to `latest`, so a SHA-pinned step still pulled a mutable image. Evidenced on main before the last bump: run 31288803917 at 44b2e33 loaded the old action 00155c9d and executed scanner 3.96.0 while the pin read v3.95.8. * security.yml sets `version: "3.96.0"` on the TruffleHog step, with a comment stating what the SHA does and does not bind. * Two tests. One asserts the pin exists and is an exact X.Y.Z. The other asserts it equals the `# vX.Y.Z` comment on the `uses:` line -- the drift guard. Dependabot bumps the SHA and the comment but has no mechanism to bump a `with:` input, so without that assertion the naive fix silently unpins on the next bump. Red/green proven with discrimination: removing the pin fails 2 tests; drifting the version while leaving the comment fails only the equality guard. * AC-3 corrected. It claimed a "full-history scan"; the wrapper runs `--since-commit <base> --branch <head>`, so it scans the push/PR range only. `fetch-depth: 0` stays -- the base commit must be resolvable -- and its test stays, now carrying a comment saying what it does and does not certify. * The false claim was traced to its source rather than patched at the symptom: a Domain Decision whose rationale asserted the scan "catches pre-existing leaks introduced before the current PR". Struck through and corrected in situ, kept visible, and labelled as a live instance of the [spec-factual-claims] Global Lesson -- an unverified tool-behaviour claim in a rationale, which propagated into an AC and survived every later review because reviewers check AC compliance, not rationale accuracy. * AC-15 consolidation created docs/architecture/ci-security.log.md, the first entry in that domain. Owner-confirmed per ship.md:83, after verifying no side effects: `.log.md` is excluded from the lifecycle-frontmatter check (14 PASS unchanged), `analyze_token_lifecycle.py` does not count docs/architecture at all, and test_deploy_tiering.py:604 documents the directory as capability-by-presence rather than a fixed set. AC-17 advisory lock checked first (none held). Tradeoff recorded, not hidden: the scanner no longer picks up new detectors between bumps. Detector freshness is traded for supply-chain immutability -- the trade AC-5 already claimed to have made. Image-digest pinning was rejected because it decouples from the comment Dependabot maintains, making drift harder to notice rather than easier. Evidence: validate.sh and validate.ps1 both pass=118 warn=4 fail=0 skip=2, exact parity. Self-archival cleared the shipped-log-in-work WARN (5 -> 4), verified by delta. 55 passed across the two files that assert on security.yml; scope chosen by grep -- test_deploy_tiering.py mentions it only in a comment, so the 37-test slow module was deliberately not run locally. Backlog validation 3 passed at 105 rows. Chain intact. Squashed to a single commit. The first push gave the pin-enforcing test a name of the form `test_` plus exactly 35 word characters, which matches Lob's key pattern `�((live|test)_[a-zA-Z0-9_]{35})�` verbatim. TruffleHog's Lob verifier returned VERIFIED and failed the Secret Detection job, so the PR pinning the secret scanner was blocked by the secret scanner, on the name of the test that enforces the pin. Renaming in a follow-up commit did NOT clear it: the run proved empirically that TruffleHog walks each commit's diff across the range rather than the net endpoint diff, so the introducing commit stayed in scope. History squashed so the string was never committed on this branch; the net change is byte-identical either way. Recorded, not silently absorbed: `--only-verified` is stated in AC-3 to bound false positives and did not bound this one, and 36 identifiers of the same shape already exist in the tree. Both go to a separate backlog row -- the detector-exclusion decision does not belong in a PR whose subject is strengthening this scanner. Backlog #166 -> Shipped. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> The literal old identifier is deliberately not reproduced anywhere in this message: it is itself the pattern, and git objects include commit messages.

…n test identifiers Surfaced by this PR's own CI: the detector's key pattern matches a word-boundary run of 'live' or 'test', an underscore, then exactly 35 characters from a class that includes the underscore — so an ordinary snake_case function name can satisfy it, and the verifier returned VERIFIED. AC-3 states --only-verified exists to bound false positives; it did not bound this one. Records two facts established empirically here and documented nowhere else: the action walks each commit's diff across the range rather than the net endpoint diff (a follow-up rename stayed red; removing the introducing commit went green), and commit messages are in scope too. 36 pre-existing identifiers of the same shape are latent in the tree. They are deliberately not enumerated in the row — quoting one would re-create the pattern in the row's own diff. The row gives the reproduction instead, with a note to read the regex from the pinned source rather than retyping it, because a hand-written attempt omitted the underscore and found nothing. Detector-exclusion options are listed, none taken: weakening a detector does not belong in a PR whose subject is strengthening this scanner. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

KbWen

Verdict: NOT READY at 982ce7b. I independently assign three P1/blocking findings. The PR treats backlog #166 (P1) as resolved; I disagree because the image remains tag-addressed and the drift test proves comment agreement rather than artifact provenance. The PR treats #171 as P2/non-blocking; I agree with deferring detector exclusion, but not with its count or mutually exclusive preferred remedies. Fresh checks reproduced the focused 55-test pass and the claimed two-failure/one-failure red-green discrimination; the inline comments record the additional mutations and all discrepancies.

…ssify Eight findings, three of them P1, all adopted; none overruled. Two changed the shipped design rather than its wording, and one is a governance violation in this unit's own classification. P1 — an exact release tag is still mutable, so the immutability this fix claimed was not achieved. A tag can be re-pointed; that is the same objection AC-5 already makes against semver action refs, and the first design accepted it for the image. The scanner is now pinned by DIGEST: `image` ends in `@sha256` and `version` carries the 64-hex manifest digest, so the wrapper's own `docker run "${IMAGE}:${VERSION}"` join composes a content-addressed reference. If upstream changes that join the result stops being a valid reference and docker fails loudly rather than silently falling back to a tag. P1 — the comment-equality guard proved only that two editable strings agree. The review demonstrated it by mutation: swapping the wrapper SHA for the previous release's while leaving comment and input untouched kept all 42 tests green. The guard is replaced by an assertion that the composed reference matches a digest form — immutability by construction, not agreement between two strings a hand edit can move together. A weaker release-comment check remains, explicitly labelled as readability rather than provenance. P1 — the quick-win classification bypassed a hard-block escalation. state_machine.md:51 makes the reverse transition MANDATORY above 200 diff lines or 2 modules; this unit is 276 lines across 7 files and four modules, and its own Phase Summary said "three modules" while keeping the tier. Reclassified to hotfix through the documented mechanism: a structured `Reclassification:` record in the Drift Log plus a re-entered bootstrap receipt, which is what makes the second epoch legal (validate.sh:1541). Hotfix demands the REVIEWED gate that was skipped, without a handoff artifact that would add nothing here. The retroactive sequencing is recorded rather than presented as a clean run. P2 — the spec was internally false in three further places the first pass missed: a Non-goal listing the PR-delta scan as out of scope when it is the shipped behaviour, and two claims that `--only-verified` bounds false positives, which #171 disproves. All corrected. P2 — false text is no longer preserved in the live spec. The first attempt struck it through and kept it; review argued that struck-through text still reads as live text to grep and to any agent loading the file, which is decisive in a repo whose primary consumer is an agent. Superseded wording now lives only in the L2 log as `[SUPERSEDED]` entries. L1 carries current truth, L2 carries history. P2 — the freshness tradeoff was mis-framed as "the trade AC-5 already claimed to have made". Withdrawn: the deployed runtime resolved `latest` and was not paying that cost, so digest pinning newly incurs it. Now an `## Accepted Risks` entry with owner, cadence, and an emergency path. P2 — `source_sha` in the new L2 log pointed at the diff base, where the file does not exist. Repointed, with the PR named as the durable reference since squash-merge does not preserve branch SHAs. P3 — the recorded validator totals are not reproducible from a clean checkout (a reviewer's detached clone reported pass=100 warn=3 skip=3). Labelled as machine-local rather than restated, with CI named as the replayable evidence. P3 — backlog #171 said 36 identifiers where the committed tree holds 35, and offered two "preferred" remedies that are mutually exclusive. Both corrected. Evidence: 57 passed across the affected suites; the digest assertion proven red by reverting to a tag reference. validate.sh and validate.ps1 both pass=118 warn=4 fail=0 skip=2 on this machine. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

) Records-only. Adds the SSoT Ship History entry that PR #402 should have carried, ahead of the v1.8.20 release cut. ## Why this is not optional `Update Sequence` stood at **147** with the newest Ship History entry covering #399/#400. Neither #401 nor #402 was recorded, and `grep -c '#402' current_state.md` returned **0** — so a **P1 security fix**, an amendment to a shipped spec's acceptance criteria, and a newly created L2 domain log were all absent from the record. That propagates: **the release cut's CHANGELOG derives from Ship History**, so v1.8.20 would have shipped release notes missing the most significant item in the version. **#401 legitimately skipped SSoT** — records-only, no feature shipped, per the 2026-07-09 reconcile-note precedent reaffirmed by PR #397, and that call survived independent review. **#402 does not qualify for the same exemption.** ## What changed - Ship History entry for `Ship-fix-166-trufflehog-scanner-pin-2026-08-12`, covering the digest pin, the AC-3/AC-5 corrections, the reclassification to `hotfix`, and the Lob false-positive incident that became #171. - `Update Sequence` 147 → 148, `Last Updated` refreshed. - **Cap rotation**: Ship History was at 10/10, so the oldest entry (`Ship-docs-repo-gotchas-14-worklog-archival-2026-07-27`) moved verbatim into `archive/ship-history-2026.md` rather than being dropped. Written with `guard_context_write.py --mode replace` under optimistic locking (`--expected-sha`, receipt committed). Not `--mode append` — that path lands at file end, and the entry belongs at the top of the section. ## Process note Classification was **measured before being assigned**: 21 changed lines across 2 substantive modules, against `state_machine.md:51`'s 200-line / 2-module hard block. The immediately preceding unit classified first and violated that block, which the independent review on #402 caught; reversing the order is the fix, and it is recorded in the Work Log as the reason the order matters. ## Evidence - `check_ssot_caps.py` → `ssot caps OK — ship history 10/10, spec index 26/30` (10 entries before and after). - `check_audit_chain.py` → `audit chain intact`. - `validate.sh` **`pass=118 warn=4 fail=0 skip=2`**. Self-archival verified by delta, not asserted: before it `warn=5` including `shipped work logs still in active work/ directory: 1`; after, that line is gone. The 4th WARN is an external reviewer's stale lock from PR #401 — gitignored, outside this diff. Totals are machine-local; CI is the replayable evidence. - **Backlog #168 fired a third time during this ship**: after the branch switch git re-materialised `INDEX.jsonl` fully CRLF and the pre-commit normalise reported **153 → 0**. Third independent confirmation that #168's fix needs the `*.jsonl text eol=lf` half, not just `O_BINARY`. Rollback: revert this PR. The sequence returns to 147 and the rotated entry returns to `current_state.md`. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

…404) Release cut for **v1.8.20**. Docs-only: version banners, CHANGELOG, and the release's own Ship History entry. **No engine, test, or logic change rides this PR** — everything substantive was already merged and individually CI-green. ## What it packages Ten commits sat unreleased on `main` while the banner still read 1.8.19. | | | |---|---| | **PR #402** | backlog **#166 (P1)** — the TruffleHog pin bound the *wrapper*, not the scanner. Now pinned by image digest; AC-3's false "full-history scan" claim and the Domain Decision that generated it corrected; new `docs/architecture/ci-security.log.md` | | **PR #395** | backlog #163+#164 — audit-wave leftovers | | **PRs #386/#377/#378** | three dependabot bumps, open 8–15 days | | **PRs #397/#399/#400/#401/#403** | records wave, including the archival of this repo's only different-vendor review artifact | ## What it changes here Banners 1.8.19 → 1.8.20 across the canonical 7 (`deploy.sh` `ACX_VERSION`, `CITATION.cff` version + `date-released`, Model Guide EN/zh-TW, Testing Protocol EN/zh-TW, `antigravity-v5-runtime.md`), CHANGELOG `[1.8.20]`, SSoT sequence 148 → 149 with the cap-10 rotation. ## Shipping a known state, not a quiet one The CHANGELOG names **five defects filed and deliberately unfixed** (#167–#171) rather than omitting them — including **the scanner false-positive class that blocked this release's own security PR**. Each fix touches tool, workflow, or `.gitattributes` code a docs-only cut must not carry, and #171's detector exclusion is a security-coverage decision that deserves its own review. It also records a governance failure rather than burying it: **PR #402 was classified `quick-win` at 276 lines across four modules**, against a hard block at 200 lines / 2 modules — which is what let its review gate be skipped. Independent review caught it; it was reclassified to `hotfix` through the documented rollback mechanism, with the retroactive sequencing stated plainly. The durable fix is procedural — *measure the diff, then classify* — and the two units after it did so. ## Evidence - **Banner sweep verified both directions**: each of the 7 replacements asserted to match exactly once before writing, then `grep -rn "1\.8\.19"` across the same 7 files → **no matches**. - **Guarded SSoT write** under optimistic locking → `{"status": "ok"}`; 10 Ship History entries before and after; `check_ssot_caps.py` → `ship history 10/10, spec index 26/30`. - `check_audit_chain.py` → `audit chain intact`. - `validate.sh` **`pass=118 warn=4 fail=0 skip=2`** — machine-local totals (a clean checkout runs 18 fewer active-work-log checks); CI is the replayable evidence. - **A wrong fact caught before it landed**: the Ship History entry first named the wrong rotated entry. Corrected in the staged content, so it never reached `current_state.md`. ## Not done at merge Per `repo-gotchas` #12 — and forgotten twice before — the release is **not complete when this merges**. The lightweight `v1.8.20` tag and `gh release create --latest` are separate manual steps, tracked to completion in this session. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

KbWen force-pushed the fix/166-trufflehog-scanner-pin branch from a8bb7ac to 6c95c37 Compare August 12, 2026 10:22

KbWen commented Aug 12, 2026

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KbWen changed the title ~~fix(ci-security): #166 — pin the TruffleHog scanner image, not just the wrapper~~ fix(ci-security): #166 — pin the TruffleHog scanner by image digest Aug 12, 2026

KbWen merged commit f70b10b into main Aug 12, 2026
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KbWen deleted the fix/166-trufflehog-scanner-pin branch August 12, 2026 14:27

KbWen mentioned this pull request Aug 12, 2026

chore(ship): record the #402 merge — seq 148, backlog #166 shipped #403

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KbWen mentioned this pull request Aug 12, 2026

chore(release): v1.8.20 — supply-chain pin + maintenance clear-down #404

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fix(ci-security): #166 — pin the TruffleHog scanner by image digest - #402

fix(ci-security): #166 — pin the TruffleHog scanner by image digest#402
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KbWen commented Aug 12, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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The defect

The fix: pinned by digest, not by tag

AC-3 was false too, and the root cause was upstream of it

The scanner blocked this PR — now backlog #171

Reclassified quick-win → hotfix

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KbWen commented Aug 12, 2026 •

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