Add secure one-time CodeRouter handoff leases - #10118
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📝 WalkthroughWalkthroughAdds a native CodeRouter handoff protocol with authenticated lease minting, single-use exchange, hashed database storage, authorization and entitlement checks, request limits, trusted origins, and telemetry scrubbing. ChangesCodeRouter native handoff
Estimated code review effort: 4 (Complex) | ~60 minutes Mergeability Score: 🟡 Moderate · up to The PR adds authenticated one-time CodeRouter handoff leases, but sensitive identity and credential-like fields may still be forwarded to error reporting, weakening the intended privacy guarantees; merge should wait for this observability issue to be fixed or explicitly accepted, with the remaining test and nonstandard-runtime follow-up tracked. Sequence Diagram(s)sequenceDiagram
participant NativeClient
participant MintPOST
participant AuthorizationContext
participant HandoffLeaseRepository
participant ExchangePOST
NativeClient->>MintPOST: Submit Stack authorization headers
MintPOST->>AuthorizationContext: Resolve team access and entitlement
AuthorizationContext-->>MintPOST: Return authorized team and user
MintPOST->>HandoffLeaseRepository: Issue hashed short-lived lease
HandoffLeaseRepository-->>NativeClient: Return lease and expiration
NativeClient->>ExchangePOST: Submit lease
ExchangePOST->>HandoffLeaseRepository: Atomically consume lease
HandoffLeaseRepository-->>ExchangePOST: Create native-handoff route token
ExchangePOST-->>NativeClient: Return route session
Possibly related PRs
Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (2 errors, 1 warning)
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| let expectedIdentity: CodeRouterHandoffIdentity = {}; | ||
| if (hasNativeStackAuthHeaders(request)) { |
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When hosted billing is enabled, a lease-only exchange skips this branch, so entitlement is checked only when the lease is minted. If the subscription-lapse webhook or reconciler runs after mint but before exchange, it revokes the existing route tokens and then this endpoint inserts a fresh 30-day token; authenticateRouteToken subsequently checks only expiry and revokedAt. A user can therefore keep minting leases around a known cancellation time and exchange one after revocation to retain hosted access for another month. Revalidate the stored principal during exchange, or atomically invalidate outstanding leases as part of billing revocation.
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Addressed in a5e650d. Hosted exchange now rechecks the stored principal entitlement immediately before claim using the transaction-bound executor, and mint rechecks entitlement after the same authority lock before inserting the lease. Added DB behavior coverage for the serialized mint recheck and entitlement lapse.
| await cloudDb().insert(coderouterHandoffLeases).values({ | ||
| teamId, | ||
| stackUserId, | ||
| leaseHash: handoffLeaseHash(lease), | ||
| expiresAt, | ||
| createdAt: now, | ||
| }); |
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Every successful mint inserts a new row here, while a repo-wide search shows no production path that deletes from coderouter_handoff_leases; exchange only sets consumedAt. Consequently both consumed and expired two-minute leases, along with all three indexes, grow for the lifetime of the deployment even though these rows have no purpose after expiry. Add scheduled or opportunistic expiry cleanup so normal handoff traffic cannot cause unbounded table and index growth.
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Inline comments:
In `@web/app/api/coderouter/handoff/_shared.ts`:
- Around line 161-185: Update the query-selector parsing loop in the shared
handoff validation flow to inspect every occurrence of teamId, team_id,
billingTeamId, and billing_team_id, rather than only the first value returned by
get. Reject the request when valid query selectors contain more than one
distinct trimmed value, while preserving existing validation for malformed or
disallowed values and the subsequent header consistency checks.
In `@web/app/api/coderouter/handoff/exchange/route.ts`:
- Around line 216-220: Remove the local isJsonContentType definition in the
exchange route and import and reuse isJsonContentType from ./_shared, matching
the existing handoff route so both protocol paths share one content-type
validation gate.
- Around line 205-212: Update the handoff response construction around
jsonHandoffResponse to derive openaiBaseUrl from the required trusted
deployment-origin configuration instead of request.url; fail closed when that
configuration is absent, and update the handler dependencies and tests to cover
the configured-origin and missing-origin paths.
In `@web/app/api/coderouter/handoff/route.ts`:
- Around line 33-38: Move the duplicated defaultRateLimit configuration into the
shared module by exporting a defaultCoderouterHandoffRateLimiter factory from
_shared, preserving the existing checkRateLimit behavior and environment
fallback order. Update both the handoff and exchange routes to import and use
this shared factory so they retain one rate-limit identity.
In `@web/tests/coderouter-handoff-route.test.ts`:
- Around line 155-158: Move argument assertions out of the mock implementations
for issueLease and exchangeLease in the affected route tests. Let the mocks only
record and return their configured values, then assert the recorded mock.calls
arguments after awaiting POST so mismatches fail directly without being
converted into a 503 response.
- Around line 182-209: Add an assertion in the “exchanges a lease without
requiring Stack credentials” test using the existing hasActiveEntitlement mock
to verify it is not called, preserving the possession-only path’s behavior while
keeping the current response assertions unchanged.
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docs/coderouter-handoff-protocol.mddocs/coderouter-operations.mdweb/.env.exampleweb/app/api/coderouter/handoff/_shared.tsweb/app/api/coderouter/handoff/exchange/route.tsweb/app/api/coderouter/handoff/route.tsweb/app/env.tsweb/db/migrations/20260813120000_coderouter_handoff_leases/migration.sqlweb/db/schema.tsweb/services/coderouter/analytics.tsweb/services/coderouter/observability.tsweb/services/coderouter/repository.tsweb/services/errors.tsweb/services/sentry.tsweb/tests/coderouter-analytics.test.tsweb/tests/coderouter-handoff-db-behavior.test.tsweb/tests/coderouter-handoff-route.test.tsweb/tests/coderouter-sentry.test.ts
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| issued = await dependencies.issueLease( | ||
| resolved.value.team.teamId, | ||
| resolved.value.user.id, | ||
| dependencies.now?.() ?? new Date(), |
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When hosted billing is enabled, the entitlement check above and this lease insertion are separate transactions, so a mint that reads an active subscription can pause while the cancellation webhook marks the subscription inactive and revokes all currently stored leases, then insert a new unconsumed lease after that revocation finishes. Exchanging that lease creates a 30-day route token despite the cancellation. Fresh evidence after the earlier revocation fix is that revokeRouteTokensForUser/revokeRouteTokensForTeam only update leases already present and share no lock with this mint path; revalidate during exchange or serialize minting and revocation on the same principal authority.
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Addressed in a5e650d. Mint now acquires the shared handoff authority lock and performs a transaction-bound entitlement recheck immediately before inserting the lease; billing revocation uses the same lock. The route maps a lapse to 402 and includes regression coverage.
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Inline comments:
In `@web/app/api/coderouter/handoff/exchange/route.ts`:
- Around line 217-232: Move the team-selector name definitions and
hasTeamSelector logic out of the local hasTeamSelector function and into
_shared.ts, exporting the shared header and query-name lists or helper. Update
validTeamSelectorHeaders to consume those same definitions, then import and use
the shared helper here so selector detection and validation remain identical.
In `@web/db/schema.ts`:
- Around line 535-558: Update the coderouterHandoffLeases table definition to
add check constraints for the leaseHash format and for expiresAt being later
than createdAt, matching both constraints already defined by the migration. Use
the existing check and sql imports and keep the current indexes and columns
unchanged.
In `@web/services/coderouter/repository.ts`:
- Around line 92-116: Update the cleanup subselect in the transaction around
coderouterHandoffLeases to use FOR UPDATE SKIP LOCKED after ordering and before
the limit, so concurrent mints select disjoint expired-row batches. Ensure
cleanup failures do not determine lease issuance: preserve or restructure the
flow so the lease insert remains the operation that determines the mint outcome.
In `@web/services/observability/report.ts`:
- Line 1: Update SENSITIVE_KEY_PATTERN used by scrubValue so lease matches only
intended sensitive keys and not release, releaseVersion, or releaseChannel; use
explicit key matching or appropriate boundaries while preserving the other
sensitive-key matches.
In `@web/tests/coderouter-handoff-db-behavior.test.ts`:
- Around line 35-199: Split the combined dbTest into separate database tests for
hashed storage, atomic single-use exchange, identity mismatch, expiry,
revocation, stale cleanup, and the exchange/revocation race. Generate a fresh
teamId and userId within each test, retain the existing injected timestamps and
assertions, and give each case isolated cleanup so revokeRouteTokensForTeam
cannot affect other scenarios.
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| // forwarded/request host in production. | ||
| CMUX_CODEROUTER_PUBLIC_ORIGIN: requireVercelNonPreviewValue( | ||
| "CMUX_CODEROUTER_PUBLIC_ORIGIN", | ||
| z.string().url(), |
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When an operator supplies a syntactically valid URL such as https://coderouter.dev/base or http://coderouter.dev, this schema accepts it and allows the deployment to start, but normalizedCoderouterOrigin rejects paths and non-loopback HTTP; consequently every otherwise-valid handoff exchange returns a retryable 503. Apply the same origin-only HTTPS constraints during environment validation so configuration errors fail deployment rather than disabling the endpoint at runtime.
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Inline comments:
In `@web/app/api/coderouter/handoff/_shared.ts`:
- Around line 316-321: Update configuredHandoffRateLimitId to read
CMUX_APP_SESSION_HANDOFF_RATE_LIMIT_ID and CMUX_FEEDBACK_RATE_LIMIT_ID from the
validated env module instead of process.env, preserving the dedicated-ID-first
fallback order and existing undefined behavior.
In `@web/app/api/coderouter/handoff/exchange/route.ts`:
- Around line 153-172: Extend the CodeRouterFailure category type to accept
“config”, then update the missing or invalid public-origin path in the handoff
exchange flow around coderouterOpenaiBaseUrl and reportCoderouterFailure to use
“config” instead of “rds”; preserve “rds” for persistence failures.
In `@web/app/env.ts`:
- Around line 174-180: Update the CMUX_CODEROUTER_PUBLIC_ORIGIN schema in
requireVercelNonPreviewValue to accept only a valid origin: reject paths,
queries, fragments, embedded credentials, and non-HTTPS schemes while preserving
the existing boot-time validation. Keep normalizedCoderouterOrigin in the
handoff flow as defense in depth.
In `@web/tests/coderouter-handoff-route.test.ts`:
- Around line 47-58: Update mintRequest so the init spread does not overwrite
the merged headers; preserve caller-provided headers while retaining the default
authorization and x-cmux-team-id entries. Ensure the incomplete-token case still
returns 401 and the oversized authorization case reaches the configured 16 KiB
bound, keeping these assertions meaningful.
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| const leaseHash = handoffLeaseHash(lease); | ||
| const predicates = [ | ||
| eq(coderouterHandoffLeases.leaseHash, leaseHash), | ||
| gt(coderouterHandoffLeases.expiresAt, now), |
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When a possession-only exchange begins just before expiry, the entitlement authorizer on lines 191–200—or a database lock wait before the update—can finish after the two-minute deadline, but this predicate still compares against the stale now captured before that work. The subsequent claim can therefore issue a route token from an already-expired lease. Compare expires_at with the database's current time in the conditional update, rather than reusing the pre-authorization snapshot.
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Inline comments:
In `@web/app/api/coderouter/handoff/_shared.ts`:
- Around line 271-294: Update the localRuntime condition in
coderouterOpenaiBaseUrl to require NODE_ENV to be explicitly "development" or
"test"; remove the undefined-value case while preserving the existing VERCEL
guard and request-origin fallback.
In `@web/services/coderouter/repository.ts`:
- Around line 99-114: Update the catch block in the opportunistic cleanup around
cloudDb().execute to record a low-cardinality cleanup-failure counter or debug
log without including lease values, while preserving the current non-failing
mint behavior.
In `@web/services/observability/report.ts`:
- Around line 63-71: Update isSensitiveKey to split uppercase acronym-to-word
boundaries before applying the existing normalization and SENSITIVE_KEY_TOKEN
test, so keys such as APIKey normalize into separate words and are recognized as
sensitive while preserving current handling for other key formats.
In `@web/tests/coderouter-handoff-db-behavior.test.ts`:
- Around line 240-259: Update the “opportunistically cleans leases beyond the
retention window” test to delete existing coderouter handoff lease rows older
than the retention cutoff before issuing the stale lease. Keep the cleanup
scoped to the fixture’s team or otherwise preserve test isolation, then retain
the existing stale-versus-fresh assertions.
In `@web/tests/coderouter-handoff-route.test.ts`:
- Around line 454-469: Refactor the test around makeCoderouterHandoffRateLimiter
so checkRateLimit records its arguments without asserting inside the mock. After
awaiting limiter(exchangeRequest()), assert the recorded call arguments and
preserve the existing call-count and allowed-result checks, ensuring assertion
failures are not swallowed by the limiter’s try/catch.
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| await tx.execute( | ||
| sql`select pg_advisory_xact_lock(hashtextextended(${accountDeletionAdvisoryLockKey(stackUserId)}, 0))`, | ||
| ); |
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When account deletion starts after resolveContext succeeds, markAccountDeletionTombstonePending acquires this same advisory lock and writes the blocking tombstone, but this transaction merely waits for the lock and then inserts the lease without rechecking that tombstone. A repo-wide search also finds no account-deletion path that consumes coderouterHandoffLeases, so the racing mint can return a valid lease after deletion has begun; a possession-only exchange can then turn it into a 30-day route token, especially in self-hosted mode where no entitlement recheck runs. Check the deletion tombstone while holding this lock and invalidate existing handoff leases as part of account deletion.
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Addressed in a5e650d. Account-deletion tombstone startup and final cleanup invalidate outstanding handoff leases and route tokens under the deletion fence; mint checks the tombstone while holding that fence, and exchange does the same before claim. Added DB coverage for tombstone blocking.
| } catch { | ||
| // Expired rows are harmless; leave them for the next mint or scheduled | ||
| // database maintenance rather than failing closed on cleanup alone. | ||
| } |
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If this cleanup statement fails—for example because of a statement timeout or a deployment role lacking delete permission—PostgreSQL marks the entire transaction aborted. Catching the JavaScript exception does not restore the transaction, so the following lease insert also fails and every mint returns 503, contrary to the stated best-effort behavior. Run cleanup in a separate transaction or protect it with a savepoint before continuing issuance.
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Addressed in a5e650d. Opportunistic cleanup now runs in a separate transaction, so a failed DELETE cannot abort issuance; failures are reported with a low-cardinality operation label without lease/token values. Added a rollback regression test for route-token insertion failure.
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| .limit(1); | ||
| if (!candidate) return null; | ||
| await lockHandoffPrincipal(tx, candidate.teamId, candidate.stackUserId); | ||
| if (authorize && !(await authorize(candidate))) return null; |
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When hosted billing is enabled, authorize calls hasActiveCoderouterSubscription, which queries cloudDb() outside this transaction and therefore needs another pooled connection while the transaction retains its own connection and advisory locks. With the default five-connection pool, five concurrent exchanges can occupy every connection—four may be waiting on the same principal lock while the first waits for a sixth connection—so the endpoint deadlocks until transaction/request timeouts release the pool. Run the entitlement query through the transaction-bound executor, or otherwise avoid acquiring a second connection while holding this transaction.
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Addressed in a5e650d. The entitlement helper accepts the transaction-bound executor, and exchange passes its existing transaction to the query, avoiding a second pooled connection while the authority lock is held.
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Actionable comments posted: 2
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Inline comments:
In `@web/services/observability/report.ts`:
- Around line 1-2: Update SENSITIVE_KEY_TOKEN used by isSensitiveKey to classify
normalized team_id and session_id identity fields as sensitive, matching the
existing team.?id and session coverage in coderouter observability. Ensure
reportCoderouterFailure applies equivalent filtering before forwarding context
to reportError, and add tests covering both breadcrumb and error-reporting
sinks.
In `@web/tests/coderouter-handoff-db-behavior.test.ts`:
- Around line 283-295: Increase the expiration offset used when creating the
lease in the “rejects expired leases without consuming them” test so the stored
expiry is safely in the past despite plausible PostgreSQL clock skew; keep the
existing null exchange assertion unchanged and avoid adding wall-clock reads to
assertions.
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docs/coderouter-handoff-protocol.mdweb/app/api/account/route.tsweb/app/api/coderouter/handoff/_shared.tsweb/app/api/coderouter/handoff/exchange/route.tsweb/app/api/coderouter/handoff/route.tsweb/app/env.tsweb/db/schema.tsweb/services/billing/pro.tsweb/services/coderouter/observability.tsweb/services/coderouter/repository.tsweb/services/observability/report.tsweb/tests/coderouter-handoff-db-behavior.test.tsweb/tests/coderouter-handoff-route.test.ts
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| export function makeCoderouterHandoffPostHandler( | ||
| dependencies: HandoffMintDependencies = defaultDependencies, | ||
| ) { | ||
| return async function POST(request: Request): Promise<Response> { |
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The new mint handler—and the corresponding exchange handler—directly sequences rate limiting, native authentication, team resolution, entitlement checks, database mutation, telemetry, and ad-hoc exception mapping inside the route. The repository’s backend rules require Effect for workflows crossing auth/database/rate-limit/telemetry boundaries and thin route adapters, so this implementation bypasses the typed failure and cancellation boundary that makes retries, idempotency, and unexpected defects auditable. Move the workflow into an Effect service and leave the handlers to parse input, run one program, and translate typed errors.
AGENTS.md reference: AGENTS.md:L113-L118
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Summary
crh_leases.crt_route-session record.Authorization contract
See
docs/coderouter-handoff-protocol.md. Mint requires the native Stack access/refresh pair plus existing Stack team membership/allowlisting,usepermission, and hosted Pro/Team entitlement when enabled. Exchange is possession-authorized; browser cookies are rejected. Optional native confirmation is bound to the same principal, and hosted lease-only exchanges recheck the stored principal's current entitlement immediately before claiming the lease.Production/non-preview deployments must configure
CMUX_CODEROUTER_PUBLIC_ORIGINand a durable Firewall rule (CMUX_APP_SESSION_HANDOFF_RATE_LIMIT_ID, with the documented feedback fallback). Missing controls fail closed.Verification
CMUX_DB_TEST.drizzle-kit check: pass; no changed-file TypeScript diagnostics.bun run typecheckandbun run lintremain red on pre-existing missing dependency/config and unrelated lint errors. The full DB behavior script was also attempted; unrelated VM workflow tests timed out, while the focused handoff DB suite passed.No cmux Swift or Rust files were modified.
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New Features
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