fix(studio): stop bucket deletion from removing policies that guard other buckets - #50298
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fix(studio): stop bucket deletion from removing policies that guard other buckets#50298sidgaikwad wants to merge 3 commits into
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…ther buckets
`extractBucketNameFromDefinition` split a policy definition on ' AND ', took the
first segment mentioning `bucket_id`, and returned the text between the first
pair of single quotes. It could only ever name one bucket and did not tell `=`
apart from `<>`, so all three callers were wrong in the same way:
- `DeleteBucketModal` deleted every policy it believed was "tied to" the bucket
being removed. A `bucket_id <> 'avatars'` policy — which guards every bucket
*except* avatars — was attributed to avatars and deleted along with it.
- The Storage Policies page listed a `bucket_id in ('avatars', 'logos')` policy
under avatars only, so logos appeared unprotected.
- `useBucketPolicyCount` undercounted for the same reason.
Replace it with `getPolicyBucketNames`, which reads every bucket a policy grants
access to across both the USING and WITH CHECK clauses, understands the
`= ANY (ARRAY[...])` form Postgres stores `in (...)` as, and attributes no bucket
to a negated condition. Policies are now grouped under each bucket they cover,
and bucket deletion only removes policies that exclusively guard that bucket.
Also stops the internal grouping key leaking into the grouped `Policy` objects.
Fixes supabase#48164
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughStorage policy handling now extracts all referenced bucket names from policy expressions. Policy grouping and counts include every applicable bucket. Bucket deletion cleanup preserves shared and negated policies. Tests cover parsing, grouping, and empty or unknown cases. ChangesStorage policy bucket coverage
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: Medium Suggested reviewers: Merge Risk: ⚪ Minimal · up to The reviewed changes have no identified merge-blocking risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@apps/studio/components/interfaces/Storage/Storage.utils.ts`:
- Line 79: The bucket policy regexes used by getPolicyBucketNames must require
identifier boundaries so they match bucket_id but not names such as
archive_bucket_id. Update both equality and ANY-expression patterns, including
suffix cases, while preserving valid bucket_id matches and the existing owner
handling.
- Line 113: Update getPolicyBucketNames to parse Boolean expressions rather than
treating lexical bucket matches as proof of coverage; return bucket names only
when every satisfying branch is exclusively constrained to the collected
buckets, preventing DeleteBucketModal from deleting policies that also apply
outside or exclude avatars. Add tests covering the OR expression combining
bucket_id with owner and the NOT bucket_id expression.
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apps/studio/components/interfaces/Storage/DeleteBucketModal.tsxapps/studio/components/interfaces/Storage/Storage.utils.tsapps/studio/components/interfaces/Storage/useBucketPolicyCount.tsapps/studio/tests/components/Storage/Storage.utils.test.ts
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…tching bucket_id Addresses two review findings, both confirmed against real `pg_policies` output on a local Postgres rather than assumed: 1. `bucket_id` matched as a bare substring, so `archive_bucket_id` read as `bucket_id`. That is reachable without touching `storage.objects` at all — a policy containing `EXISTS (SELECT 1 FROM archive a WHERE a.archive_bucket_id = 'avatars')` is stored verbatim and would have attributed `avatars` to an unrelated policy. Both patterns now require `\b` boundaries, which still admits a qualified `objects.bucket_id`. 2. Naming one bucket was treated as proof the policy applies only to that bucket. It is not: `(bucket_id = 'avatars') OR (owner = auth.uid())` names only avatars yet still grants access to the caller's objects in every other bucket. Deletion now goes through `isPolicyExclusiveToBucket`, which additionally rejects any clause carrying an `OR`, a `NOT` or a subquery. The bias is deliberate: leaving a stale policy behind is recoverable, deleting a live one is not. Postgres also stores an explicitly written `NOT (bucket_id = 'avatars')` verbatim instead of folding it into `<>`, so that form is now discarded during extraction too — previously it was misattributed to the very bucket it excludes. `getPolicyBucketNames` is documented as a lexical read used to decide where a policy is shown, explicitly not as a Boolean proof of coverage.
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Inline comments:
In `@apps/studio/components/interfaces/Storage/Storage.utils.ts`:
- Around line 153-157: Update the policy validation near getPolicyBucketNames so
definition and check are validated independently rather than through their
merged bucket names. Require every non-null clause to reference only bucketName,
rejecting policies with an unrestricted clause alongside a bucket-scoped clause;
add tests covering both definition-unrestricted/check-scoped and
definition-scoped/check-unrestricted cases.
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`isPolicyExclusiveToBucket` merged `definition` and `check` before checking, so a policy
written as
using (owner = auth.uid()) with check (bucket_id = 'avatars')
produced a single bucket name, carried no `OR`/`NOT`/subquery, and was treated as owned by
avatars. Its USING half still grants the caller access to their own objects in every other
bucket, so deleting the avatars bucket would have removed that access.
USING and WITH CHECK govern different operations, so each clause a policy actually has must
independently confine it to the bucket. A policy with no clauses at all is no longer treated
as exclusive either, which the merged form would have accepted.
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I have read the CONTRIBUTING.md file.
YES
What kind of change does this PR introduce?
Bug fix, plus unit tests.
Fixes #48164.
Credit where it's due: #48164 was reported by @jashkarangiya, who also opened #48165 against it. They closed that PR themselves on 10 Sep while it was still awaiting review. This PR is a fresh, smaller take on the same bug that leads with the destructive symptom rather than the grouping one. Happy to close this instead if they'd prefer to reopen theirs.
What is the current behavior?
extractBucketNameFromDefinitionsplits a policy definition on' AND ', takes the first segment mentioningbucket_id, and returns the text between the first pair of single quotes. It can only ever name one bucket, and it does not tell=apart from<>. All three callers inherit that:1. Bucket deletion removes policies that still guard other buckets.
DeleteBucketModaldeletes every policy it believes is "tied to" the bucket being removed. A policy written asbucket_id <> 'avatars'guards every bucket except avatars, but the parser attributes it to avatars — so deleting the avatars bucket silently deletes it, dropping the protection on every remaining bucket. For a multi-bucket policy, whether it gets deleted depends on which bucket happens to appear first in the definition.2. The Storage Policies page hides policies. A policy written as
bucket_id in ('avatars', 'logos')is listed underavatarsonly. Underlogosit does not appear at all, so that bucket reads as unprotected on the page users rely on to audit exactly that.3. Per-bucket policy counts undercount, for the same reason.
What is the new behavior?
Two functions replace the old helper, split by how much certainty the caller needs.
getPolicyBucketNames— which buckets a policy references, used to decide where it is displayed:USING(definition) andWITH CHECK(check) clauses= ANY (ARRAY[...])form Postgres normalizesbucket_id in (...)intobucket_id <> 'avatars'and theNOT (bucket_id = 'avatars')form. Those land in the existing "Ungrouped" sectionarchive_bucket_idno longer reads asbucket_id''-escaped quotes in bucket namesisPolicyExclusiveToBucket— whether a policy applies to one bucket and nothing else, used for the destructive path. Referencing exactly one bucket is necessary but not sufficient, so it additionally rejects any clause carrying anOR, aNOTor a subquery. This is deliberately conservative: it can only ever delete fewer policies than before, never more. Leaving a stale policy behind is recoverable; deleting a live one is not.Consequently:
Also fixes the internal grouping key leaking into the grouped
Policyobjects, so the returned type is no longer lying about its shape.The old helper is removed rather than left as a re-export shim, per
apps/studio/AGENTS.md; there were no other importers.Additional context
The parser is written against real
pg_policiesoutput, not hand-written SQL. I created each case on a local Supabase Postgres and read back what is actually stored:pg_policiesbucket_id in ('avatars', 'logos')(bucket_id = ANY (ARRAY['avatars'::text, 'logos'::text]))bucket_id <> 'avatars'(bucket_id <> 'avatars'::text)not (bucket_id = 'avatars')(NOT (bucket_id = 'avatars'::text))bucket_id = 'bob''s files'(bucket_id = 'bob''s files'::text)(bucket_id = 'avatars') or (owner = auth.uid())((bucket_id = 'avatars'::text) OR (owner = auth.uid()))exists (select 1 from archive a where a.archive_bucket_id = 'avatars')(EXISTS ( SELECT 1 FROM archive a WHERE (a.archive_bucket_id = 'avatars'::text)))Worth flagging: Postgres does not fold
not (bucket_id = 'x')into<>, and thearchive_bucket_idcase needs no change tostorage.objects— an ordinary subquery over a user's own table reaches it. Both were missed in my first pass and caught in review. The unit tests use these exact strings as fixtures.Verification
apps/studio/tests/components/Storage/Storage.utils.test.tsEdgeFunctionOverview.utils.test.ts, is pre-existing and unrelated — I confirmed it fails identically on a cleanmasterwith this branch stashed. It looks timezone-dependent (fails at UTC+5:30, and the expectations are consistent with a UTC machine)tsc --noEmitcleanpnpm --filter studio run lint:ratchetpassespnpm knip --workspace apps/studiocleanSummary by CodeRabbit