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fix(codex-prompt): close base variant create bypass and bound PUT body - #5274

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@luvs01 luvs01 commented Sep 20, 2026 •

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Summary

  • A caller-supplied id on the base-variant write path used the delete-or-edit existence check, so naming a syntactically valid but missing id bypassed the MAX_BASE_VARIANTS cap through an alternate create path. Caller ids are now edit-only: a supplied id must already exist.
  • The PUT /api/codex-prompt/base route also stored the raw body verbatim without the normalizeBody + 64 KiB cap applied to every other prompt-layer write. The route now normalizes first and rejects oversized bodies with body_too_large.

Verification

  • bun test tests/codex-integration/codex-prompt-base-variants.test.ts tests/codex-integration/codex-prompt-route.test.ts — 91 pass, 0 fail
  • bun x tsc --noEmit — clean

Checklist

  • Scope stays focused and avoids unrelated cleanup.
  • Docs or release notes were updated when needed.
  • Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

Review readiness checklist

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  • All CI tests are green on my local testing.

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  • I resolved all correct Codex and CodeRabbit findings.

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Summary by CodeRabbit

Summary by CodeRabbit

  • Bug Fixes

    • Unknown base variant identifiers are now rejected instead of creating variants.
    • Variant content is normalized before storage.
    • Normalized content over 64 KiB is rejected.
    • Failed writes leave configuration unchanged.
  • Documentation

    • Added multilingual Management API documentation for Codex prompt layers, limits, and error responses.
  • Tests

    • Added integration and API coverage for unknown identifiers and oversized content.

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✅ Deterministic PR hygiene checks passed.

@github-actions github-actions Bot added the bug Something isn't working label Sep 20, 2026
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📝 Walkthrough

Walkthrough

Base variant writes now require supplied identifiers to reference existing variants. The route normalizes bodies before storage and rejects normalized UTF-8 content larger than 64 KiB. Tests and localized Management API references cover these rules.

Changes

Base variant validation

Layer / File(s) Summary
Validation and integration coverage
src/codex/prompt-layers.ts, src/server/management/codex-prompt-routes.ts, tests/codex-integration/*
A supplied variant id must match an existing variant. The route normalizes the body before storage and returns HTTP 400 with body_too_large when normalized UTF-8 content exceeds 64 KiB. Tests verify unknown_layer, body_too_large, and no configuration changes on rejection.
Management API documentation
docs-site/src/content/docs/*/reference/management-api.md
Localized Management API references document Codex prompt-layer endpoints, normalization, size limits, revision conflicts, and route error codes.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 4 files. (8 skipped: 8… Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly and concisely describes the main changes: preventing the base variant creation bypass and enforcing a size limit for PUT request bodies.
Full details: Docstring Coverage

Explanation

Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 4 files. (8 skipped: 8 unsupported.)

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✅ READY

  • all PR quality gates passed; the review readiness checklist is complete.

Review readiness checklist

  • ✅ All CI tests are green on my local testing.
  • ✅ I pushed my PR to the latest dev commit.
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Maintainers notified: @lidge-jun @Ingwannu

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  • 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@src/server/management/codex-prompt-routes.ts`:
- Line 407: Update the relevant docs-site API documentation for PUT
/api/codex-prompt/base to state that normalized UTF-8 request bodies over 65,536
bytes are rejected with the body_too_large error, preserving the documented
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Comment thread src/server/management/codex-prompt-routes.ts
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리뷰 · 우선순위 64 / 80

이 PR은 Codex 프롬프트의 base variant 쓰기 길을 단단히 막는 작은 보안·무결성 수정이다. 베이스는 dev, 팁은 a56d045fa78, 지금은 초안(draft)이다. 고치는 구멍은 두 개다.

첫째, writeBaseVariant에서 호출자가 id를 직접 넘기면 예전에는 “삭제할 때만” 존재 여부를 봤다. 그래서 문법만 맞는 여섯 글자 id(예: aaaaaa)를 새로 지어 보내면, 서버가 만든 id가 아닌데도 새로 파일이 생기고 MAX_BASE_VARIANTS(2개) 한도를 우회할 수 있었다. 지금은 호출자가 id를 준 경우는 편집(또는 삭제)만 되고, 그 id가 이미 있어야 한다. 새로 만드는 길은 id: null일 때 서버가 newBaseVariantId로 뽑는 경우뿐이다.

둘째, PUT /api/codex-prompt/base는 다른 프롬프트 레이어 쓰기와 달리 본문을 그대로 저장하고, normalizeBody와 64 KiB(MAX_BODY_BYTES) 한도도 안 걸고 있었다. 이제는 먼저 정규화하고, UTF-8 기준으로 넘치면 body_too_large로 거절한 뒤, 정규화된 본문만 넘긴다.

테스트는 단위(caller-supplied id cannot create)와 라우트(없는 id 편집 거절 + 64KiB+1 본문 거절) 둘 다 붙였다. 작성자 로컬은 관련 bun 테스트 91통과·tsc 깨끗하다고 적었다. 리뷰 시점 호스티드 CI는 hygiene·label·enforce-target 정도만 보이고, draft라 본격 테스트 잡은 아직 안 돌거나 대기인 상태로 보인다. CodeRabbit은 docs-site에 한도·에러를 적으라고 Minor로 남겼다.

라인 - src/codex/prompt-layers.ts writeBaseVariant: HTTP 라우트는 64 KiB를 막지만, 이 함수 자체에는 같은 한도가 없다. 지금처럼 관리 API만 믿으면 되고, 나중에 다른 호출자가 붙으면 또 커질 수 있다. 한도를 라이브러리에도 둘지, 라우트만으로 충분한지 정리하면 좋다.

라인 - src/server/management/codex-prompt-routes.ts PUT base: 한도 검사는 본문만 본다. 실제 파일은 # 제목\n + 본문이라 제목이 길면 디스크上 파일이 한도를 아주 조금 넘을 수 있다. 다른 레이어와 같은 패턴이면 의도일 수 있고, “파일 전체” 기준으로 맞출지도 선택이다.

라인 - docs-site: base PUT이 이제 다른 쓰기와 같이 정규화·64 KiB·body_too_large를 쓰는데, 문서 갱신은 이 PR에 없다. CodeRabbit Minor와 같다. “원래 다른 경로와 맞춘 것”이면 후속도 가능하고, API 계약을 문서에 박을지 정하면 된다.

라인 - PR 상태: draft이고 readiness 체크리스트가 비어 있으며, tip 기준 핵심 테스트 CI는 아직 거의 안 보인다. 머지 판단은 ready 전환 + exact-head 초록 뒤에 하면 된다.

메인테이너의 판단이 필요한 지점

MAX_BODY_BYTES를 writeBaseVariant까지 내릴지, 라우트 방어만으로 둘지. docs-site 한 줄을 이 PR에 넣을지 후속으로 둘지. draft 체크리스트·CI를 머지 블로커로 볼지(보통은 ready 후에 보면 된다).

너의 추천

우회 경로를 닫는 방향이 맞고, 변경 범위도 작고 테스트가 핵심을 짚는다. ready로 올린 뒤 tip CI가 초록이면 머지 후보로 두면 된다. docs는 가능하면 한 줄 보강, 아니면 “base PUT도 다른 레이어와 동일 한도”를 후속 이슈로 명시. 라이브러리 한도 추가는 필수는 아니고, 호출면이 API뿐이면 지금으로도 충분하다. preview deploy 이야기는 하지 않았다.

이 댓글은 grok-bot이 작성했습니다

@luvs01
luvs01 marked this pull request as ready for review September 20, 2026 06:50

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The implementation closes both bypasses, but the current head still has one repository-completion blocker: the new public API contract is undocumented. PUT /api/codex-prompt/base now normalizes the body and rejects normalized UTF-8 content above 65,536 bytes with body_too_large; the relevant docs-site endpoint documentation must state that limit and error so clients can validate before sending.

Please add that contract documentation and resolve the existing CodeRabbit thread. The only production caller of writeBaseVariant is currently this management route, so duplicating the cap inside the lower-level writer is not required for this PR. The branch is also 19 commits behind current dev; refresh it and obtain exact-head hosted CI before re-requesting approval.

@luvs01
luvs01 force-pushed the fix/base-variant-write-hardening branch from a56d045 to 653a958 Compare September 20, 2026 14:49
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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@docs-site/src/content/docs/reference/management-api.md`:
- Line 240: Update the PUT /api/codex-prompt/base documentation to state that
any supplied id must reference an existing stored variant, with unknown ids
returning unknown_layer, not only id default:
docs-site/src/content/docs/reference/management-api.md:240-240,
docs-site/src/content/docs/ja/reference/management-api.md:150-150,
docs-site/src/content/docs/ko/reference/management-api.md:153-153,
docs-site/src/content/docs/fr/reference/management-api.md:175-175,
docs-site/src/content/docs/ru/reference/management-api.md:174-174,
docs-site/src/content/docs/tr/reference/management-api.md:179-179,
docs-site/src/content/docs/zh-cn/reference/management-api.md:148-148, and
docs-site/src/content/docs/zh-tw/reference/management-api.md:144-144. Add the
equivalent accurately translated condition in each localized document while
preserving id: null as creation-only.

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Comment thread docs-site/src/content/docs/reference/management-api.md Outdated
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luvs01 commented Sep 20, 2026

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@Ingwannu Rebased onto current dev (126f5b3) and documented the new contract: the management-api reference now has a Codex prompt layers section covering the endpoint family, with PUT /api/codex-prompt/base stating that a normalized UTF-8 body over 65,536 bytes is rejected with �ody_too_large — mirrored across all eight locales. The existing CodeRabbit thread is replied to and resolved.

Local: �un test tests/codex-integration/codex-prompt-base-variants.test.ts tests/codex-integration/codex-prompt-route.test.ts — 91 pass, 0 fail; �un x tsc --noEmit — clean. Hosted checks are registered on the new head; Cross-platform CI and React Doctor show action_required pending maintainer approval, same as the previous head.

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Actionable comments posted: 2


  • 🪄 Fix CodeRabbit comments on this PR
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@docs-site/src/content/docs/reference/management-api.md`:
- Line 239: Update the `PUT /api/codex-prompt/base/select` documentation row in
English and the corresponding locale rows for `ja`, `ko`, `fr`, `ru`, `tr`,
`zh-cn`, and `zh-tw` to include `unknown_layer` under HTTP 400 and
`developer_instructions_not_owned` under HTTP 409, while preserving the existing
`invalid body` and `stale_revision` entries.
- Line 240: Update the `/api/codex-prompt/base` documentation rows in English,
Japanese, Korean, French, Russian, Turkish, Simplified Chinese, and Traditional
Chinese to state that an omitted id or id: null creates a variant, while an
existing string id edits the variant or deletes it when delete: true. Preserve
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luvs01 commented Sep 20, 2026

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Follow-up: dev advanced again, so the branch is now rebased onto 480c1c7 (current tip). The two follow-up CodeRabbit threads on the docs rows are also addressed — base/select now lists unknown_layer/developer_instructions_not_owned, and the base row spells out that an omitted or null id creates while a supplied id edits/deletes. Tests and tsc re-verified on this head — 91 pass, 0 fail; tsc clean.

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luvs01 requested a review from Ingwannu September 21, 2026 00:25

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Re-reviewed current head 41b1de8ad485ded1b8ec0e378e5cbf7bdb93aa83. The previous repository-completion blocker is resolved: the 65,536-byte normalized UTF-8 limit and body_too_large response are now documented in English and every shipped translation, alongside focused route coverage.

No additional code blocker found in the current patch. The branch is 16 commits behind current dev and its target gate is not green, so it is not ready to integrate. Please rebase onto latest dev, resolve any current contract drift, and rerun exact-head CI; then request the replacement approval.

A caller-supplied id used the delete-or-edit existence check, so naming a syntactically valid but missing id bypassed the variant cap. Caller ids are now edit-only. The PUT base route also stored the raw body without normalization or the 64 KiB cap used elsewhere.

Signed-off-by: luvs01 <27862058+luvs01@users.noreply.github.com>
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luvs01 commented Sep 22, 2026

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Consolidated into #5540 in native Stack #5505.

Source head: 0be32929a34678cbcc9296666248f3e9039c87b8. Replacement head: e352aee0343548a606a8d071b3504848c7503a41.

All 1 unique source contribution commit(s) match their carried commits by stable Git patch ID. A route regression was aligned with the lower Stack layer: a known but absent collaboration tag reports not-rendered, while unknown layers still report unmapped. Prepared aggregate checks passed 200 runtime/configuration tests and 20 GUI/locale tests. Combined route/probe rerun passed 119 tests with one POSIX skip; combined GUI tests, typecheck, structure, privacy and ratchet checks passed. Full cross-platform CI, POSIX execution, docs build and independent review remain pending.

Closing this duplicate standalone review entry at the author's request after verifying migration. This is not a merge or release claim; remaining integration checks and reviews are tracked on the draft replacement. Original branches are retained.

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