fix(security): require pairing for child link join

[luvs01]

Summary

Require an operator-paired GUI session for POST /api/link/join and for joinAvailable. Unpaired loopback sessions remain unable to initiate a durable Child join. Discovery and host-confirmation retain their separate admission policy.

The earlier author follow-up ff2a85560aaa875657b4585ae04b2f390fc46881 merges dev at eb7f0f0970c2298f8b2d66d170c4d4be869f301b, resolves the management-document conflict without losing the upstream OAuth pause/resume entries, and aligns the route-registry rationale with the paired-only handler. No unpaired/admin-token fallback was added.

Standalone enrollment follow-up — 4fbad2b

4fbad2bd6990a0daaa7999345bafb145a45c1f77 implements the previously missing operator-mediated standalone pairing path, without weakening the join gate:

• The existing ocx gui pair --origin <origin> proof/capability flow accepts only the standalone configured literal loopback origin (http://127.0.0.1:<port> or http://[::1]:<port>). The CLI also checks the attested runtime's actual address and port. Wildcard binds, localhost aliases, a client role, CORS entries and public hub hints do not widen this path. Existing hub pairing remains separate.
• Redemption requires the exact local server/browser origin and a kernel-observed local peer. Grants remain high-entropy, hashed in memory, single-use, short-lived and rate-limited. Explicit alternate credentials remain rejected. Local paired sessions have a fixed five-minute lifetime, retain CSRF/origin checks, and are invalidated by a role/origin change. Automatic local sessions remain unpaired.
• Local link setup exposes explicit code entry. Only pairing-exchange requests omit the stale automatically attached shared-plane credential; normal API authentication and the relay's separate machine-session credentials are preserved. Successful pairing refreshes capability status; it does not automatically join, change runtime role, or reload into an unpaired session.
• Added boundary tests plus a composed CLI capability → grant mint/redemption → real session control → guarded join test. The latter does not stub isPaired; HTTP dispatch and the SSH join operation are test doubles. A full native end-to-end join is still required.

Verification — distinguish revisions and environments

Standalone enrollment follow-up 4fbad2bd, local verification (historical): complete session/capability modules with selected auth-helper source and a small Node adapter: original 3 pass / 4 fail, patched 7 pass / 0 fail. Complete browser API module with a minimal Window adapter: original 0 pass / 2 fail, patched 2 pass / 0 fail. All eight changed TypeScript/TSX files passed syntax transpilation; local and published Git blob hashes were compared. These are not claimed as full Bun, React, repository typecheck, real HTTP-server or native SSH/restart runs.

Standalone enrollment follow-up 4fbad2bd, hosted CI (historical): for head 4fbad2bd, run 36527940355 has passed typecheck, GUI lint/tests/build, privacy scan, generated-surface validation, structure checks, docs build, Docker smoke and npm-global smoke on Ubuntu/Windows at the last check. React Doctor also passed. The main test shards and desktop shell were still running; skipped platform matrices are not counted as passes. At that checkpoint, full exact-head CI had not yet been confirmed.

Historical integrated revision only: bun test tests/server/link-join-route.test.ts tests/server/link-management-routes.test.ts passed 52 tests; typecheck, structure and privacy checks passed at the earlier conflict-resolution revision. Those results do not independently validate the new enrollment path.

Remaining merge gates — keep in Draft

The original missing-path blocker now has an implementation, but it is not closed by source review or injected composition alone. Independent security review and a real standalone CLI mint → HTTP redemption → paired dashboard → Child join/restart exercise remain required. Do not restore unpaired loopback/admin-token admission to unblock setup. No production configuration, listener, trust store, SSH connection, or runtime role was changed during this author follow-up.

Checklist

• Pairing enforcement remains fail-closed.
• Earlier merge conflict and route-inventory inconsistency are resolved.
• Explicit bounded standalone enrollment is implemented with negative/composition regressions.
• Hosted typecheck, GUI and privacy checks passed for the recorded standalone enrollment follow-up.
• Full real standalone enrollment and native Child join/restart are verified.
• Security-sensitive changes received independent explicit security review.
• Required Cross-platform CI passed for 4aea69ca6ee22866210162379c1a40c5b288e836; exact checkout-tree evidence is recorded in the current verification comment (run 36831906040).

Summary by CodeRabbit

• Security

  • Joining a Home as a Child now requires an operator-paired dashboard session. Credentialless local dashboard sessions can no longer join or show joining as available, though they can still use other dashboard features.

• Documentation

  • Updated remote-link guidance to clarify that adding a Child from Home requires a dashboard session on Home or a paired Hub session, while converting the current computer into a Child requires an operator-paired session.

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📝 Walkthrough

Walkthrough

The Child join route now requires an operator-paired dashboard session. Unpaired loopback sessions cannot start a join, and joinAvailable reports false for those sessions. Guides and API documentation describe the updated session requirements.

Changes

Child join authorization

Layer / File(s)	Summary
Require pairing for Child joins src/server/management/link-routes.ts, src/server/management/route-registry.ts, structure/gui-and-management-api.md, structure/remote-link.md, docs-site/src/content/docs/*/guides/remote-link.md	The join route uses paired-session authorization. joinAvailable checks for a paired session while retaining its standalone-runtime and configured-port checks. The guides and API documentation describe the session requirements.
Verify join authorization tests/server/link-join-route.test.ts, tests/server/link-management-routes.test.ts	Tests verify that unpaired loopback sessions receive 403 without starting a join, paired sessions can join, and unpaired sessions report joinAvailable: false.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Dashboard
  participant LinkJoinRoute
  participant auth
  participant pairedSession
  participant joinHome
  Dashboard->>LinkJoinRoute: POST /api/link/join
  LinkJoinRoute->>auth: authorize with paired
  auth->>pairedSession: check operator pairing
  alt Session is paired
    pairedSession-->>auth: paired session
    auth-->>LinkJoinRoute: authorization succeeds
    LinkJoinRoute->>joinHome: start Child join
  else Session is not paired
    pairedSession-->>auth: no paired session
    auth-->>LinkJoinRoute: authorization fails
    LinkJoinRoute-->>Dashboard: 403
  end

Loading

Merge Risk: 🟠 High · up to ff2a8

A standalone computer cannot authorize the session needed to join or rejoin as a Child. Provide a usable operator-authorization path before merging.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to ff2a8

The new check blocks unpaired local sessions from joining, but the available pairing flow appears restricted to Hub runtimes. An ordinary standalone installation may therefore be unable to complete the newly required pairing and join as a Child.

Retained concerns

• Medium · architecture · inferred: The new paired-session requirement appears unattainable through the production pairing flow on an ordinary standalone runtime: grant creation and redemption require Hub mode, but joining requires standalone mode. Consequently the secure Child-join path and its dashboard availability indication may remain blocked.

Security review details

Security Blast Radius

• observed — A successful join issues a Home link credential and changes this machine’s client connection and restart state; the documented outcome redirects local Codex and Claude traffic through the Child link. The affected scope is the joining machine and its selected Home, not an evidenced fleet-wide change.

Security Findings and Attack Paths

• observed — The tested unpaired local-session path is refused before the join dependency runs. No introduced unauthorized-join path was established; the identified concern is that the authorized path may be unavailable in the role where join must run.

Trust Boundaries and Controls

• observed — Pairing authority comes from the server-held issuance record, not a caller-supplied pairing flag. The join route requires that authority rather than accepting the credentiallessly obtainable loopback session or an admin-token principal.

Resilience and Maintainability Implications

• inferred — The new authority check occurs at initiation, not throughout asynchronous enrollment or recovery. Existing join compensation addresses link resources and partial failure, but the available contract does not say whether revoking a paired session mid-join should cancel an already admitted operation.

Hardening Proposals

• proposed — Provide an operator-authorized pairing path usable by a standalone runtime without treating a credentialless loopback session as approval, then verify grant issuance, redemption, status, and join together using production authorization.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 4 files. (1 skipped: 1…	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 identifies the primary security change: requiring pairing for Child link joins. It is concise and directly matches the changes to POST /api/link/join and paired-session admission.

Full details: Docstring Coverage

Explanation

Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 4 files. (1 skipped: 1 unsupported.)

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[lidge-jun]

리뷰 · 우선순위 73 / 80

이 PR은 대시보드에서 "이 컴퓨터를 Child로 바꾸기"를 더 까다롭게 만든다. 예전에는 비밀번호 없이 자동으로 생긴 로컬 세션만 있으면 POST /api/link/join이 됐다. 같은 컴퓨터의 다른 프로그램이 그 세션을 집어서, 이 컴퓨터의 Codex와 Claude 트래픽을 공격자가 고른 Home으로 계속 보낼 수 있었다. 이제는 join과 상태 값 joinAvailable이 운영자가 페어링한 세션만 통과한다. 후보 목록, 호스트 지문 확인, Home에서 Child를 추가하는 경로는 로컬 세션도 그대로 쓸 수 있다. 베이스는 dev이고, 같은 수정을 다루는 열린 중복 PR은 없다.

src/server/gui-session.ts:263 - 페어링 코드를 만드는 createGuiPairingGrant는 runtimeRole이 hub일 때만 된다.
src/server/gui-session.ts:319 - 그 코드를 세션으로 바꾸는 consumeGuiPairingGrant도 hub가 아니면 바로 거절한다. 일반 설치(standalone)는 페어링 세션을 만들 수 없다.
src/server/management/link-routes.ts:136 - joinAvailable은 페어링 세션이면서 동시에 standalone이어야 한다. join 자체도 554행의 auth(ctx, "paired") 다음에 standalone 검사를 한다.
이 두 조건은 실제 서버에서 같이 참이 되지 않는다. Hub의 페어링 세션은 409 standalone_required이고, 이 컴퓨터에서 연 대시보드 세션은 403 forbidden이다. Child로 연결하는 길이 막힌다.
tests/server/link-join-route.test.ts:177 - 테스트는 standalone 설정에 paired: true를 직접 넣어서 202를 기대한다. isPaired는 스텁이고, 기본 runtimeRole은 standalone이다. 그 조합은 세션을 발급하는 실제 코드로는 생기지 않는다. 테스트는 통과하지만 사용자는 연결하지 못한다.
gui/src/pages/RemoteLink.tsx:382 - joinAvailable이 거짓이면 포트가 다르다는 경고(remoteLink.error.join_port_mismatch)를 띄운다. 이 PR 이후 로컬 대시보드는 포트가 맞아도 그 경고를 보고, Child 카드는 눌리지 않는다. 이유는 세션인데 문구는 포트다. structure/remote-link.md는 포트 안내 문장을 지웠고, 화면 문구는 그대로다.

메인테이너의 판단이 필요한 지점

로컬 프로그램이 join을 못 하게 막는 방향은 맞다. 지금 코드의 페어링 세션은 Hub 전용이라, standalone에서 운영자가 통과할 문이 없다. 그 문을 정해야 한다. standalone에서도 운영자만 증명되는 세션을 새로 만들거나, 이미 있는 더 강한 자격으로 join을 열어야 한다. 이 게이트 그대로 합치면 기능이 죽는다.

Home 쪽 POST /api/link/apply는 자격 없는 로컬 세션으로 그대로 열려 있다. 이번 구멍이 "이 컴퓨터 트래픽을 빼돌리는 join"뿐이면 apply는 둬도 된다. 로컬 프로그램의 링크 변경을 전부 막으려면 apply도 같은 수준의 문이 필요하다.

너의 추천

합치지 말고, join을 통과할 수 있는 실제 세션을 먼저 정한 다음 게이트를 그 세션에 맞춰라. 테스트는 paired: true 스텁 대신, Hub가 아닌 프로세스에는 페어링 세션이 없다는 걸 포함해야 한다. 화면 경고는 포트가 다른 경우와 세션이 부족한 경우를 나눠 써라.

이 댓글은 grok-bot이 작성했습니다

[lidge-jun]

Thanks, the direction is right: on dev a loopback dashboard session can reach POST /api/link/join, and requiring a paired session closes that.

Before this can land there is one blocker. A pairing-issued session can only be minted on a hub (createGuiPairingGrant and consumeGuiPairingGrant both require runtimeRole === "hub"), but join only runs on a standalone runtime. As written, no real session can satisfy the new check, so Child-initiated join becomes unreachable and a Child that disconnects cannot rejoin. Two things would fix it:

1. A way for the operator to pair a standalone runtime, for example an ocx link pair command that prints a one-use grant redeemed on the standalone's loopback with local attestation, origin binding and CSRF, with a join test that uses it. If the intent is to retire Child-initiated join, remove the route, its tests and the dashboard card instead of leaving them unreachable.
2. RemoteLink.tsx: the disabled Child card currently shows the join_port_mismatch notice for what is now an authorization refusal, so the message would be wrong. A joinDenied reason from /api/link/status would let it say "pair this machine first".

The rest checked out: the tests fail on dev without the change, the merge is clean, and nothing sensitive is logged.

[lidge-jun]

Thanks for this, @luvs01. The release train 4 bug-hardening lane reviewed it against current dev (24b2f39b77). We are leaving it open rather than merging it in this train, for one concrete reason plus an upgrade concern.

The gate makes Child join unreachable. Operator pairing only exists on a Hub. createRemoteGuiGrant and the pairing bootstrap both refuse unless config.runtimeRole === "hub" (src/server/gui-session.ts:263 and :319). POST /api/link/join is the opposite: it requires a standalone runtime (src/server/management/link-routes.ts:106, :136, :556). Requiring a paired admission for join therefore turns away every real join request, and joinAvailable would always read false. The tests pass because they construct a paired session directly rather than obtaining one through a real standalone pairing flow.

Upgrade behavior. A dashboard from an older release that calls join would receive a bare 403, with no reason the GUI can show and no path to pair, so an upgraded Child would look broken rather than protected.

A version we could land needs two things: an operator credential that exists on a standalone runtime (for example, a one-time code printed by ocx on the Child's terminal, or a CLI-only join path), and a typed denial reason that the dashboard renders with upgrade/pairing guidance. It would also need tests that obtain that credential through the real standalone route. We are tracking the underlying boundary as a maintainer decision and will link the follow-up here.

[luvs01]

Acknowledged — holding this PR pending the maintainer-tracked boundary decision. The gate is only landable once a standalone-mintable operator credential exists (one-time code on the Child's terminal or a CLI-only join path) plus a typed denial reason the dashboard can render; I will pick it back up when the follow-up lands, or earlier if that direction is delegated.

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Actionable comments posted: 1

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Inline comments:
Review comments at @src/server/management/route-registry.ts:
- Line 376: Add a secure operator-authorization flow that creates or transfers a
paired session valid in the standalone runtime’s local session state, allowing
POST /api/link/join and joinAvailable to authorize it. Preserve existing
restrictions on pairing-grant creation and redemption for non-Hub runtimes. Add
coverage exercising the real session issuance, authorization, and join flow
rather than injecting paired session fields.

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[luvs01]

Author follow-up ff2a855 integrates current dev, resolves the management-document conflict while preserving upstream route inventory, and corrects the join route's admission rationale. The branch was advanced without force. 52 focused Bun tests, TypeScript, structure and privacy checks passed; full exact-head CI 36364188626 remains pending.

This PR was converted to Draft because the production setup prerequisite is not satisfied: the paired-only join requires standalone, but the existing grant issuance/consumption and CLI pairing origin require hub. Injected paired-session tests do not demonstrate a fresh standalone can actually enroll. The paired-only restriction was not bypassed. The body now explicitly requires an operator-mediated standalone enrollment flow and independent security review before readiness.

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[luvs01]

Commit attribution corrected with the repository owner's explicit authorization.

The earlier ChatGPT follow-up incorrectly used noreply@users.noreply.github.com, causing attribution to the unrelated noreply account. This was an author/committer metadata mistake, not use of another person's signing key.

Replaced ff2a85560aaa875657b4585ae04b2f390fc46881 with 232fc745fd095430a1e4f68e9cc60d1537be2122. Author and committer now both use luvs01 <27862058+luvs01@users.noreply.github.com>, with GitHub mapping independently verified as luvs01.

Only the two identity fields changed. The source tree (4fa6662ff964925ec8df8afaf3d2cb38f6882a18), parent order, message and timestamps are unchanged; previous contributors' commits are intact. The replacement and removal of six task-owned temporary branches were performed atomically with explicit expected-SHA leases.

Previous mentions of the old SHA remain historical references to the equivalent corrected commit. Draft status and the unresolved standalone enrollment/security prerequisites are unchanged. This metadata repair does not implement that enrollment path, and old-SHA CI results are not new-SHA results.

[Ingwannu]

Draft blocker at exact head 232fc745fd095430a1e4f68e9cc60d1537be2122: fresh standalone cannot satisfy the new pairing prerequisite. /api/link/join requires a paired session, while GUI grant creation/consumption and CLI pairing-origin validation remain Hub-only. The tests inject paired: true instead of exercising issuance, authorization, and join, so joinAvailable is false and real standalone join remains 403. Keep draft until there is a one-time standalone operator enrollment path, a real issuance→authorization→join regression, the existing thread is resolved, and exact-head CI runs.

[luvs01]

Maintenance verification for 4aea69ca6ee22866210162379c1a40c5b288e836:

Merged current dev (0328373fb88fe0d019b29ae278e153d7fed4bcc7), preserving this PR's scope. 69 synthetic pairing/link and snapshot tests (410 assertions); typecheck, structure, privacy and file-size gates passed.

Cross-platform CI succeeded for this HEAD; the checkout tree matches the PR HEAD tree. Skipped jobs remain skipped. Local validation used focused tests; the full local suite and test:changed were not run.

The installed standalone CLI grant then browser redemption then authorized join/restart flow and independent maintainer security approval are still required. This PR remains draft.

[luvs01]

Addressed the disabled-Child guidance request in 1a20825e91d0531a360d13ffc5cec620e2335712.

GET /api/link/status now adds a typed, nullable joinDenied only for GUI sessions: pairing_required, standalone_required, or join_port_mismatch, in admission order. Unpaired dashboards say to pair this machine first; missing/unknown reasons from older or future servers use generic unavailable guidance. The pairing form appears only for a pairing refusal on the existing local transport. Admin/CLI status shape and all POST join admission checks are unchanged; refreshing a paired status never joins automatically.

Local verification on the published tree: 52 server/link tests, 39 GUI tests, 10 locale tests and 9 file-size tests passed (110 distinct tests). Typecheck, GUI lint/i18n lint/build, structure, privacy and docs build passed. All 25 changed blobs and tree 58a614f3b3ab026e7376111b0db23f3be3a1fd13 match the tested checkout.

Broader changed-suite coverage is unverified: the default runner lacked dev refs, and the HEAD-based run was stopped when it attempted external-provider network access. Screenshot capture was blocked when the cloud browser refused the local preview. These are not claimed as passing checks.

Cross-platform CI completed successfully on attempt 2 for exact PR head 1a20825e91d0531a360d13ffc5cec620e2335712; React Doctor also passed. The first test 1/4 attempt failed before a Remote Workspace test could bind its temporary management port (EADDRINUSE). A single targeted rerun, with no code changes, passed all 48 batches, including that same test. Other successful jobs were retained; selected skipped jobs remain skipped and are not counted as passes.

CI checked GitHub's merge commit b6fb82199437ce88fe9c98067bb7e728ac8ba30f (tree 5eb99ca48f59d6cc4dd45f237150d14796101edd), combining this PR head with dev 7b2deb80591b088fc0946141f5cadb764bc930e6. This is distinct from the locally tested and published PR tree recorded above. Keeping Draft and the existing review hold: independent security approval and the real standalone CLI mint → HTTP redemption → Child join/restart exercise remain required. No real pairing, SSH connection, restart, or runtime setting was changed.