fix: end CodeRouter sessions on team removal; fresh auth for presence mutations

[lawrencecchen]

Faster revocation, per the security audit decision:

• CodeRouter: Stack's team_membership.deleted webhook now also revokes that user's CodeRouter CLI sessions for the team (revokeRouteTokensForTeamMember), instead of leaving them usable for up to 30 days. team.deleted revokes every token and API key of the team (existing revokeRouteTokensForTeam). All steps run; the webhook answers 500 for retry if any failed.
• Presence worker: device revocation and control-socket setup verify the bearer with Stack on every call (verifyRequest(..., { fresh: true })) instead of trusting the 60-second positive cache. Read and heartbeat routes keep the cache.

No schema change (coderouter_route_tokens.revoked_at exists).

Not covered here (remaining): a missed webhook delivery still leaves the session until Svix redelivers; already-open presence control sockets are not closed on revocation.

Verification: web bun test tests/coderouter-route-token-repository.test.ts tests/stack-webhook-team-revocation.test.ts and bun run typecheck; workers/presence bun test (267 pass) and bun run typecheck.

Changelog

Fixed: Removing someone from a team now ends their CodeRouter sessions for that team right away.

🤖 Generated with Claude Code

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Summary by cubic

Fixes two security audit findings: removing a team member left their CodeRouter CLI sessions usable for up to 30 days, and the presence worker answered device-revocation and control-socket setup from a 60-second positive auth cache.

CodeRouter

• Member removal now revokes that user's unbound CodeRouter tokens for the team; VM-bound tokens are left to the machine lifecycle.
• Team deletion revokes all of the team's route tokens and API keys.
• All revocation steps run; the webhook returns 500 for retry if any fails.

Presence worker

• Device revocation and control-socket setup re-verify the bearer with Stack on every call (fresh: true) instead of trusting a cached success; read and heartbeat routes keep the cache.

No schema change. A missed webhook delivery still leaves the session until Svix redelivers, and already-open presence control sockets are not closed on revocation.

^{Written for commit aa98c6b. Summary will update on new commits.}

Summary by CodeRabbit

• Bug Fixes
  • Revoking a team member’s access now also revokes that member’s active CodeRouter sessions. Revoking a team’s access revokes sessions for the entire team.
  • Control socket and device-revocation requests now check the current token status instead of relying on a previously cached successful check.
  • Access-revocation operations now report failures from session revocation alongside failures from other revocation steps, while still attempting the other revocation actions.

[github-actions]

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Configuration used: Repository: manaflow-ai/cmux/.coderabbit.yaml

Review profile: ASSERTIVE

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Run ID: 7d17d470-910c-46e5-b58c-621d0a9dffda

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Reviewing files that changed from the base of the PR and between 60db949 and aa98c6b.

📒 Files selected for processing (1)

• web/tests/coderouter-route-token-repository.test.ts

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📝 Walkthrough

Walkthrough

Team and member access revocation now includes CodeRouter route-token revocation. Presence control socket and device-revocation routes now request fresh Stack token verification instead of relying on cached successful verification.

Changes

Team route-token revocation

Layer / File(s)	Summary
Member route-token operation web/services/coderouter/repository.ts, web/tests/coderouter-route-token-repository.test.ts	The repository revokes unrevoked, unbound route tokens for the specified team and user. The test checks that the supplied timestamp is applied.
Team and member revocation wiring web/services/vms/teamMemberRevocation.ts, web/tests/stack-webhook-team-revocation.test.ts	Team and member revocation now invoke CodeRouter session revocation alongside existing operations. Tests cover the revocation calls and propagation of a CodeRouter failure.

Fresh presence authentication

Layer / File(s)	Summary
Fresh verification behavior workers/presence/src/auth.ts, workers/presence/test/auth.test.ts	verifyRequest accepts a fresh option. It rechecks cached successes with Stack when requested, while cached rejections remain usable.
Fresh verification on control routes workers/presence/src/index.ts	The control socket and device-revocation routes request fresh token verification.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Routes as Control socket and device-revocation routes
  participant Verifier as verifyRequest
  participant Cache as Verification cache
  participant Stack
  Routes->>Verifier: Request verification with fresh true
  Verifier->>Cache: Read cached result
  Cache-->>Verifier: Return cached success
  Verifier->>Stack: Recheck token
  Stack-->>Verifier: Return verification result
  Verifier-->>Routes: Return authenticated user or null

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Suggested reviewers: austinywang

Merge Risk: ⚪ Minimal · up to 60db9

The changes tighten session revocation and authentication checks. Adding the VM-exclusion assertion improves regression protection, but no current behavioral failure blocks merging after normal checks.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 60db9

The change tightens access removal and authentication without an identified new grant of authority. Revocation still depends on event delivery and successful retries. Coordination with concurrent session creation is not fully established, and existing control connections are outside the new authentication gate.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• observed — Revocation authority is bounded to the signed event's team and, for member removal, its user. Presence forwarding selects an account control-plane object from the verified user ID; device-revocation headers are rebuilt rather than accepting a client-supplied account identity.

Security Findings and Attack Paths

• inferred — A member-associated API key is outside the new member-session revoker, and API-key authentication checks its revocation marker rather than current team membership. This credential behavior predates the change and is not retained as an introduced or worsened PR concern; whether membership removal must invalidate these keys remains a policy question.

Trust Boundaries and Controls

• observed — The new repository export is downstream of signed webhook processing and only removes credential authority. At the presence boundary, fresh verification never authorizes from a positive cache entry; a cached rejection can only deny access.

Resilience and Maintainability Implications

• inferred — Repeated and concurrent revocation updates converge because only unrevoked matching rows are changed. This does not establish serialization against session issuance: membership resolution precedes a separate token insert, so the evidence supports revocation of matching persisted sessions, not an atomic fence against every concurrent creation.

Hardening Proposals

• proposed — If immediate revocation is intended to cover every member credential and ongoing control connection, explicitly define API-key and VM-token ownership policy, coordinate issuance with removal, and add revocation-aware revalidation or closure of existing control sockets.

🚥 Pre-merge checks | ✅ 24 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 57.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 7 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (24 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies both primary changes: ending CodeRouter sessions on team removal and using fresh authentication for presence mutations.
Description check	✅ Passed	The description explains the security problems, resulting behavior, testing performed, changelog entry, and known limitations. It is mostly complete, although it does not preserve the template's expli…
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.
Cmux Cloud Persistent Session And Early Input	✅ Passed	The PR does not change Cloud terminal creation, cmux-tui transport, manual panes, PTY readiness, input ownership, or session multiplexing. It adds CodeRouter token revocation and changes presence cont…
Cmux Swift Actor Isolation	✅ Passed	The pull request changes only TypeScript files under web and workers/presence. The changed-file inventory contains no Swift files or Swift-related production changes, so the Swift actor-isolation …
Cmux Swift Blocking Runtime	✅ Passed	PASS: The pull request changes only TypeScript files. The authoritative diff contains no Swift files or Swift runtime code, so it does not introduce or expand any Swift blocking or timing synchronizat…
Cmux Browser Automation Off-Main	✅ Passed	PASS: The pull request changes seven web and presence-worker files only. It does not change Sources/TerminalController.swift, `Packages/macOS/CmuxControlSocket/Sources/CmuxControlSocket/Wire/Control…
Cmux Expensive Synchronous Load	✅ Passed	PASS: The pull request changes only TypeScript files under web and workers/presence, plus TypeScript tests. The review-scoped diff contains no Swift production changes and no `RestorableAgentSessi…
Cmux Cache Substitution Correctness	✅ Passed	PASS. The diff does not replace a fresh authoritative read with a cache in a persistence, history, undo, or snapshot path. It adds fresh: true to /v1/control/socket and `/v1/control/devices/revoke…
Cmux No Hacky Sleeps	✅ Passed	PASS. The PR introduces no fixed sleeps, timers, polling loops, delayed dispatch, or wall-clock waits in production code. The changed production paths use database updates, Promise.allSettled, and i…
Cmux Algorithmic Complexity	✅ Passed	The production diff does not introduce a prohibited complexity pattern. revokeRouteTokensForTeamMember performs one database UPDATE ... WHERE and does not fetch or scan rows in memory. The revocat…
Cmux Swift Concurrency	✅ Passed	PASS: The reviewed diff changes seven TypeScript files only. It contains no Swift or cmux-owned Swift paths, so it does not introduce or expand any legacy Swift concurrency pattern covered by this che…
Cmux Swift @Concurrent	✅ Passed	The pull request changes only TypeScript files (.ts) and contains no Swift files or Swift concurrency annotations. The cmux Swift @concurrent check is not applicable.
Cmux Swift Package Boundaries	✅ Passed	The pull request changes seven TypeScript files only. The authoritative diff contains no Swift files, SwiftPM manifests, or Xcode project changes. The Swift package boundary check is therefore not app…
Cmux Swiftpm Lockfiles	✅ Passed	The PR changes only TypeScript source and test files under web/ and workers/presence/. The authoritative diff contains no SwiftPM package, Xcode project, .gitignore, workflow, or dependency chan…
Cmux Swift Logging	✅ Passed	The pull request changes seven TypeScript files only. The review-scoped diff contains no Swift files and no added logging calls. The Swift logging check is therefore not applicable.
Cmux User-Facing Error Privacy	✅ Passed	PASS. The production diff adds revocation and fresh-auth behavior, but it does not add or expose implementation details in user-facing errors. Presence routes still return generic errors such as `unau…
Cmux Full Internationalization	✅ Passed	The production diff changes token revocation and authentication control flow only. It adds no Swift text, web UI copy, API response copy, rendered markdown, changelog, metadata, or locale/message entr…
Cmux Swiftui State Layout	✅ Passed	PASS: The pull request changes only TypeScript test and worker files. The review-scoped diff contains no Swift or SwiftUI files and no SwiftUI state or layout changes. The custom check is not applicab…
Cmux Architecture Rethink	✅ Passed	PASS: The reviewed diff contains no Swift files. It changes TypeScript files under web/ and workers/presence/ only, so the Swift architectural-rethink criteria do not apply.
Cmux Swift Auxiliary Window Close Shortcuts	✅ Passed	The pull request changes only TypeScript files under web/ and workers/presence/. It contains no Swift changes and no standalone cmux-owned window code. The auxiliary-window close-shortcut rule does no…
Cmux Source Artifacts	✅ Passed	The PR changes only seven existing TypeScript source and test files. The diff contains hand-written CodeRouter, VM revocation, and presence-auth code plus related tests. No local logs, screenshots, re…
Cmux No Test Or Debug Seam In Production Source	✅ Passed	The pull request changes seven TypeScript files under web/ and workers/presence/. The authoritative diff contains no Swift files and no changed path under a production Sources/ directory. This check i…

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Inline comments:
Review comments at @web/tests/coderouter-route-token-repository.test.ts:
- Around line 204-217: Update the test for revokeRouteTokensForTeamMember to
assert that the rendered where clause includes the vm_id is null filter. Keep
the existing SQL and parameter assertions unchanged.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository: manaflow-ai/cmux/.coderabbit.yaml

Review profile: ASSERTIVE

Plan: Advanced

Run ID: d3ba8ae1-cf1e-488c-87e8-dbdf7d54931f

📥 Commits

Reviewing files that changed from the base of the PR and between ed8129d and 60db949.

📒 Files selected for processing (7)

• web/services/coderouter/repository.ts
• web/services/vms/teamMemberRevocation.ts
• web/tests/coderouter-route-token-repository.test.ts
• web/tests/stack-webhook-team-revocation.test.ts
• workers/presence/src/auth.ts
• workers/presence/src/index.ts
• workers/presence/test/auth.test.ts

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 2 remain after this review.

[github-actions]

Merge receipt for aa98c6bfa4, merged 2026-09-30 20:29:44 UTC

• Not verified at merge: ci-status (not reported), guards (18) (in progress), Web tests (1/4) (in progress), web-db-migrations (failure)
• Verified: CI fast guards, Fast static checks, GhosttyKit release check, Testbox broker trust boundary, Web complexity, Web complexity candidate, Web tests (2/4), Web tests (3/4), Web tests (4/4), web-production-build, web-subarea-scope, web-typecheck, and 1 more
• Skipped by policy: agent-session-web-resources, browser, Claude wrapper regressions, diff-sidecar-check, Dogfood build #​${{ github.event.pull_request.number }}, full-suite-coverage, macos, react-apps-check, remote-daemon, suite-coverage, web-build, web-database-tests, and 2 more
• Full suite: runs on main after merge.

Labeled merged-unverified: if main breaks near this merge, look here first.