feat(security): report the resolved worker isolation posture - #3664
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kojiwakayama merged 3 commits intoAug 13, 2026
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WORKER_ISOLATION_ENABLED is a gate, not a surface. It is required by WORKER_ISOLATION_API, WORKER_ISOLATION_DATA and WORKER_ISOLATION_SSR and enables none of them on its own, so setting it alone resolves every surface to off. resolveFlags() emitted nothing at all in that case — not even at debug — so the configuration read as enabled while behaving exactly like unset. Flag resolution now reports itself once: the effective per-surface state at info, a warn when the master switch is set with no surface in force, and a warn for the mirror-image mistake of surface flags without the master switch. The existing capability warnings for a runtime that cannot prepare isolated API route source are unchanged; they were already loud. Adds getIsolationPosture(), a typed snapshot of requested versus effective state per surface plus apiPreparationSupported, and resolves it during production server startup so the posture lands in the startup log rather than on whichever request happens to read a flag first. The posture is deliberately not published on the unauthenticated /_health response, where it would tell an anonymous caller which realm tenant code runs in. No change to the isolation mechanism or to any gate's value.
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📝 WalkthroughWalkthroughThe worker pool now resolves and caches requested and effective isolation posture for each surface. It logs diagnostics, exposes ChangesIsolation posture reporting
Estimated code review effort: 3 (Moderate) | ~20 minutes Mergeability Score: ⚪ Minimal · up to This change adds startup logging and a typed snapshot for worker isolation posture without changing isolation behavior; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant ProductionServer
participant WorkerPool
participant Logger
ProductionServer->>WorkerPool: getIsolationPosture()
WorkerPool->>WorkerPool: Resolve isolation flags
WorkerPool->>Logger: Emit posture diagnostics
WorkerPool-->>ProductionServer: Return IsolationPosture
ProductionServer->>Logger: Record startup posture
ProductionServer->>ProductionServer: Create request handler
Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Inline comments:
In `@src/security/README.md`:
- Around line 275-286: Rewrite the affected documentation paragraph in README.md
into short paragraphs using direct, concise, active, present-tense language.
Clearly state that a configuration may appear enabled while resolving to no
active isolation surface, and preserve the existing explanation of flag
resolution, posture reporting, startup logging, and health-response behavior.
In `@src/security/sandbox/isolation-posture.test.ts`:
- Around line 24-108: Replace all direct Deno.env usage in captureLogs and the
test cleanup/setup paths with the repository’s runtime-neutral environment test
utility, preserving the existing environment variable names and behavior so
isolation posture tests remain eligible for Node and Bun.
- Around line 83-93: Update the test around getIsolationPosture to set
VERYFRONT_HOST_ALLOW_PROJECT_EXECUTION for the downgrade scenario, assert
hostExecutionGranted is true, api.effective is false, and inForce is false
alongside the existing requested assertions, and clear the grant during cleanup.
In `@src/security/sandbox/worker-pool.ts`:
- Around line 1384-1386: Update the documentation for the resolved isolation
configuration snapshot to remove the “health output” claim, leaving only its
valid startup-log purpose and not implying use in unauthenticated health
responses.
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Fix all unresolved CodeRabbit comments on this PR:
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src/security/README.mdsrc/security/sandbox/isolation-posture.test.tssrc/security/sandbox/worker-pool.tssrc/server/production-server.ts
- Replace the two em dashes added by this PR (README prose and the IsolationPosture JSDoc) with ASCII punctuation, per the public copy rules. - Split the operator paragraph into short paragraphs and state plainly that a configuration can read as enabled and still resolve to no active isolation surface. - Drop the "health output" claim from getIsolationPosture and replace it with an explicit warning not to publish the snapshot on an unauthenticated response. - Make isolation-posture.test.ts runtime neutral (setEnv/deleteEnv instead of Deno.env) so the Node and Bun runners stop skipping the file. - Correct the misnamed compiled-runtime test: without a host-execution grant the flag stands and the surface stays effective. Add a separate test for the downgrade branch under VERYFRONT_HOST_ALLOW_PROJECT_EXECUTION.
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Summary
WORKER_ISOLATION_ENABLEDis a gate, not a surface. It is required byWORKER_ISOLATION_API,WORKER_ISOLATION_DATAandWORKER_ISOLATION_SSRand enablesnone of them on its own, so setting only the master switch resolves every surface to
off — identical behaviour to leaving it unset.
resolveFlags()emitted nothing in that case. Not a warning, not an info line, not evenat
DEBUG. The flag therefore reads as enabled in a configuration file while behavingexactly like an absent flag, and nothing in the logs distinguishes the two.
This PR adds observability for that flag. It does not change the isolation mechanism, and
no gate's value changes.
What changed
resolveFlags()now reports itself once per process:info— the effective per-surface state, so a positive statement of the postureexists in the log even when everything resolves as intended;
warn— the master switch is set but no surface is in force;warn— surface flags are set without the master switch (the mirror-image mistake).getIsolationPosture()returns a typed snapshot: requested versus effective persurface, plus
apiPreparationSupported,hostExecutionGrantedand aninForceroll-up. The existing per-surface booleans each answer for one surface and cannot say
that the configuration as a whole resolved to nothing.
production-server.tsresolves the posture during startup, so it lands in the startuplog rather than on whichever request happens to read a flag first. This also surfaces
the existing fail-closed
TypeErrorfor a malformed flag value at startup instead ofon first traffic, which matches what
src/security/README.mdalready documents.Deliberately not added to the unauthenticated
/_healthresponse: which realm tenantcode executes in is not something an anonymous caller should be able to read. Startup logs
plus the typed accessor cover the operator need without that trade.
The pre-existing warnings for a runtime that cannot prepare isolated API route source are
untouched — those were already loud (a
warnon downgrade, anerrorplus a typed 503when the flag stands and execution fails closed). Only the all-surfaces-resolve-to-off
path was silent.
Test evidence
New
src/security/sandbox/isolation-posture.test.ts. The first test was written and runagainst the unmodified code, capturing log records with the master switch on and no
surface flags:
Empty at
LOG_LEVEL=DEBUG— the resolution was genuinely silent, not merely quiet.After the change:
Wider run over the affected areas (
src/security/,src/routing/api/,src/data/,src/server/):ok | 339 passed (4346 steps) | 0 failed.deno fmt --check(5026 files),deno lint,deno checkon the touched files, andscripts/lint/check-module-boundaries.tsall clean — the boundary script's"debt decreased by 1" note reproduces identically on the base commit and is unrelated.
Summary by CodeRabbit
New Features
Bug Fixes
Documentation