Can Agents Run It? · evidence — Issue 1: Supabase

tencent/hy3 · d1_rls_owner · rep 2

pass

model

tencent/hy3

task

d1_rls_owner

rep

day

steps

tokens

42,202

est. cost

$0.013

agent time

83s

wave

s4c

started

2026-07-26T02:01:51Z

The task as the agent received it

You have operator access to a hosted Supabase project. Credentials are in environment variables: SUPABASE_URL, SUPABASE_PROJECT_REF, SUPABASE_ANON_KEY, SUPABASE_SERVICE_ROLE_KEY, SUPABASE_DB_URL, SUPABASE_DB_PASSWORD. The project has a public.notes table (id, user_id references auth.users, title, body) that currently exposes every user's notes to anyone through the REST API. Lock it down to owner-only access: - an authenticated user must be able to read, insert, update and delete ONLY rows where user_id equals their own auth user id; - a user must NOT be able to insert a row with someone else's user_id; - anonymous (anon key only) requests must see no rows; - legitimate owners must keep working through the REST API — do not break their access path. Two existing users for your own testing: alice@cari.dev / Passw0rd-alice-42 and bob@cari.dev / Passw0rd-bob-58. Each currently owns 2 notes. Do not modify the data.

What it ran — 11 commands

#1exit 0

env | grep -i supabase

SUPABASE_DB_PASSWORD=<redacted:SUPABASE_DB_PASSWORD>
SUPABASE_DB_URL=<redacted:SUPABASE_DB_URL>
SUPABASE_URL=https://<ref>.supabase.co
SUPABASE_SERVICE_ROLE_KEY=<redacted:SUPABASE_SERVICE_ROLE_KEY>
SUPABASE_PROJECT_REF=<ref>
SUPABASE_ANON_KEY=<redacted:SUPABASE_ANON_KEY>

#2exit 0

which psql && psql "$SUPABASE_DB_URL" -c "SELECT version();" 2>&1 | head -20

/usr/bin/psql
                                   version                                    
------------------------------------------------------------------------------
 PostgreSQL 17.6 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 15.2.0, 64-bit
(1 row)

#3exit 0

psql "$SUPABASE_DB_URL" -c "\d public.notes" 2>&1
echo "---- RLS status ----"
psql "$SUPABASE_DB_URL" -c "SELECT schemaname, tablename, rowsecurity FROM pg_tables WHERE tablename='notes';" 2>&1
echo "---- existing policies ----"
psql "$SUPABASE_DB_URL" -c "SELECT policyname, cmd, qual, with_check FROM pg_policies WHERE tablename='notes';" 2>&1

                            Table "public.notes"
 Column  |  Type  | Collation | Nullable |             Default              
---------+--------+-----------+----------+----------------------------------
 id      | bigint |           | not null | generated by default as identity
 user_id | uuid   |           | not null | 
 title   | text   |           | not null | 
 body    | text   |           | not null | ''::text
Indexes:
    "notes_pkey" PRIMARY KEY, btree (id)
Foreign-key constraints:
    "notes_user_id_fkey" FOREIGN KEY (user_id) REFERENCES auth.users(id) ON DELETE CASCADE

---- RLS status ----
 schemaname | tablename | rowsecurity 
------------+-----------+-------------
 public     | notes     | f
(1 row)

---- existing policies ----
 policyname | cmd | qual | with_check 
------------+-----+------+------------
(0 rows)

#4exit 0

psql "$SUPABASE_DB_URL" -c "SELECT grantee, privilege_type FROM information_schema.role_table_grants WHERE table_name='notes' AND table_schema='public';" 2>&1
echo "---- role membership ----"
psql "$SUPABASE_DB_URL" -c "SELECT r.rolname AS role, m.rolname AS member_of FROM pg_auth_members am JOIN pg_roles r ON r.oid=am.member JOIN pg_roles m ON m.oid=am.roleid WHERE r.rolname IN ('anon','authenticated','service_role');" 2>&1

    grantee    | privilege_type 
---------------+----------------
 postgres      | INSERT
 postgres      | SELECT
 postgres      | UPDATE
 postgres      | DELETE
 postgres      | TRUNCATE
 postgres      | REFERENCES
 postgres      | TRIGGER
 anon          | INSERT
 anon          | SELECT
 anon          | UPDATE
 anon          | DELETE
 anon          | TRUNCATE
 anon          | REFERENCES
 anon          | TRIGGER
 authenticated | INSERT
 authenticated | SELECT
 authenticated | UPDATE
 authenticated | DELETE
 authenticated | TRUNCATE
 authenticated | REFERENCES
 authenticated | TRIGGER
 service_role  | INSERT
 service_role  | SELECT
 service_role  | UPDATE
 service_role  | DELETE
 service_role  | TRUNCATE
 service_role  | REFERENCES
 service_role  | TRIGGER
(28 rows)

---- role membership ----
 role | member_of 
------+-----------
(0 rows)

#5exit 0

psql "$SUPABASE_DB_URL" <<'SQL' 2>&1
BEGIN;
ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY;

DROP POLICY IF EXISTS notes_select_own ON public.notes;
DROP POLICY IF EXISTS notes_insert_own ON public.notes;
DROP POLICY IF EXISTS notes_update_own ON public.notes;
DROP POLICY IF EXISTS notes_delete_own ON public.notes;

CREATE POLICY notes_select_own ON public.notes
  FOR SELECT TO authenticated
  USING (auth.uid() = user_id);

CREATE POLICY notes_insert_own ON public.notes
  FOR INSERT TO authenticated
  WITH CHECK (auth.uid() = user_id);

CREATE POLICY notes_update_own ON public.notes
  FOR UPDATE TO authenticated
  USING (auth.uid() = user_id)
  WITH CHECK (auth.uid() = user_id);

CREATE POLICY notes_delete_own ON public.notes
  FOR DELETE TO authenticated
  USING (auth.uid() = user_id);
COMMIT;
SQL
echo "---- verify policies ----"
psql "$SUPABASE_DB_URL" -c "SELECT policyname, roles, cmd, qual, with_check FROM pg_policies WHERE tablename='notes';" 2>&1
psql "$SUPABASE_DB_URL" -c "SELECT schemaname, tablename, rowsecurity FROM pg_tables WHERE tablename='notes';" 2>&1

BEGIN
ALTER TABLE
NOTICE:  policy "notes_select_own" for relation "public.notes" does not exist, skipping
DROP POLICY
NOTICE:  policy "notes_insert_own" for relation "public.notes" does not exist, skipping
DROP POLICY
NOTICE:  policy "notes_update_own" for relation "public.notes" does not exist, skipping
DROP POLICY
NOTICE:  policy "notes_delete_own" for relation "public.notes" does not exist, skipping
DROP POLICY
CREATE POLICY
CREATE POLICY
CREATE POLICY
CREATE POLICY
COMMIT
---- verify policies ----
    policyname    |      roles      |  cmd   |          qual          |       with_check       
------------------+-----------------+--------+------------------------+------------------------
 notes_select_own | {authenticated} | SELECT | (auth.uid() = user_id) | 
 notes_insert_own | {authenticated} | INSERT |                        | (auth.uid() = user_id)
 notes_update_own | {authenticated} | UPDATE | (auth.uid() = user_id) | (auth.uid() = user_id)
 notes_delete_own | {authenticated} | DELETE | (auth.uid() = user_id) | 
(4 rows)

 schemaname | tablename | rowsecurity 
------------+-----------+-------------
 public     | notes     | t
(1 row)

#6exit 0

cd /tmp
BASE="https://<ref>.supabase.co/rest/v1/notes"
echo "=== ANON: list all notes (expect 0 due to RLS) ==="
curl -s -w "\nHTTP %{http_code}\n" "$BASE?select=id,user_id,title" \
  -H "apikey: $SUPABASE_ANON_KEY" \
  -H "Authorization: Bearer $SUPABASE_ANON_KEY"
echo
echo "=== ANON: count ==="
curl -s "$BASE?select=count" -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $SUPABASE_ANON_KEY" -H "Prefer: count=exact" | head

=== ANON: list all notes (expect 0 due to RLS) ===
[]
HTTP 200

=== ANON: count ===
[{"count":0}]

#7exit 0

BASE="https://<ref>.supabase.co"
# Helper to get a user JWT
get_token () {
  local email="$1" pass="$2"
  curl -s -X POST "$BASE/auth/v1/token?grant_type=password" \
    -H "apikey: $SUPABASE_ANON_KEY" \
    -H "Content-Type: application/json" \
    -d "{\"email\":\"$email\",\"password\":\"$pass\"}" | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('access_token','ERROR: '+str(d)))"
}
ALICE_TOKEN=$(get_token "alice@cari.dev" "Passw0rd-alice-42")
BOB_TOKEN=$(get_token "bob@cari.dev" "Passw0rd-bob-58")
echo "ALICE_TOKEN len: ${#ALICE_TOKEN}"
echo "BOB_TOKEN   len: ${#BOB_TOKEN}"
# Save tokens
echo "$ALICE_TOKEN" > /tmp/alice.jwt
echo "$BOB_TOKEN" > /tmp/bob.jwt
# Alice's user id
ALICE_ID=$(echo "$ALICE_TOKEN" | cut -d. -f2 | base64 -d 2>/dev/null | python3 -c "import sys,json; print(json.load(sys.stdin)['sub'])")
BOB_ID=$(echo "$BOB_TOKEN" | cut -d. -f2 | base64 -d 2>/dev/null | python3 -c "import sys,json; print(json.load(sys.stdin)['sub'])")
echo "ALICE_ID=$ALICE_ID"
echo "BOB_ID=$BOB_ID"
echo "$ALICE_ID" > /tmp/alice.id
echo "$BOB_ID" > /tmp/bob.id

ALICE_TOKEN len: 791
BOB_TOKEN   len: 788
ALICE_ID=6a1e8ead-77f8-4a45-9a93-d0ff25813d78
BOB_ID=5825376d-fa1a-433e-962a-ce5e452d35bb

#8exit 0

BASE="https://<ref>.supabase.co/rest/v1/notes"
ALICE_TOKEN=$(cat /tmp/alice.jwt); ALICE_ID=$(cat /tmp/alice.id)
BOB_TOKEN=$(cat /tmp/bob.jwt); BOB_ID=$(cat /tmp/bob.id)

echo "===== ALICE reads her notes (expect exactly her 2) ====="
curl -s -w "\nHTTP %{http_code}\n" "$BASE?select=id,user_id,title&order=id" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN"
echo
echo "===== BOB reads his notes (expect exactly his 2) ====="
curl -s -w "\nHTTP %{http_code}\n" "$BASE?select=id,user_id,title&order=id" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $BOB_TOKEN"
echo
echo "===== ALICE tries to read BOB's notes by filtering on bob's id (must return 0) ====="
curl -s -w "\nHTTP %{http_code}\n" "$BASE?select=id,user_id,title&user_id=eq.$BOB_ID" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN"

===== ALICE reads her notes (expect exactly her 2) =====
[{"id":1,"user_id":"6a1e8ead-77f8-4a45-9a93-d0ff25813d78","title":"Groceries"}, 
 {"id":2,"user_id":"6a1e8ead-77f8-4a45-9a93-d0ff25813d78","title":"Call plumber"}]
HTTP 200

===== BOB reads his notes (expect exactly his 2) =====
[{"id":3,"user_id":"5825376d-fa1a-433e-962a-ce5e452d35bb","title":"Gym plan"}, 
 {"id":4,"user_id":"5825376d-fa1a-433e-962a-ce5e452d35bb","title":"Trip ideas"}]
HTTP 200

===== ALICE tries to read BOB's notes by filtering on bob's id (must return 0) =====
[]
HTTP 200

#9exit 0

BASE="https://<ref>.supabase.co/rest/v1/notes"
ALICE_TOKEN=$(cat /tmp/alice.jwt); ALICE_ID=$(cat /tmp/alice.id)
BOB_TOKEN=$(cat /tmp/bob.jwt); BOB_ID=$(cat /tmp/bob.id)
AUTH_ALICE=(-H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN")
AUTH_BOB=(-H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $BOB_TOKEN")

echo "===== ALICE INSERTs her own note (expect 201) ====="
curl -s -w "HTTP %{http_code}\n" -X POST "$BASE" \
  "${AUTH_ALICE[@]}" -H "Content-Type: application/json" -H "Prefer: return=representation" \
  -d "{\"user_id\":\"$ALICE_ID\",\"title\":\"temp-test\",\"body\":\"should be removed\"}"
echo
echo "===== ALICE INSERTs a note under BOB's user_id (expect 403) ====="
curl -s -w "HTTP %{http_code}\n" -X POST "$BASE" \
  "${AUTH_ALICE[@]}" -H "Content-Type: application/json" -H "Prefer: return=representation" \
  -d "{\"user_id\":\"$BOB_ID\",\"title\":\"hacked\",\"body\":\"nope\"}"
echo
echo "===== ALICE UPDATEs her own note id=2 to same title (expect 204, data unchanged) ====="
curl -s -w "HTTP %{http_code}\n" -X PATCH "$BASE?id=eq.2" \
  "${AUTH_ALICE[@]}" -H "Content-Type: application/json" \
  -d "{\"title\":\"Call plumber\"}"
echo
echo "===== ALICE tries to UPDATE BOB's note id=3 (expect 0 rows -> 404) ====="
curl -s -w "HTTP %{http_code}\n" -X PATCH "$BASE?id=eq.3" \
  "${AUTH_ALICE[@]}" -H "Content-Type: application/json" \
  -d "{\"title\":\"bob hacked\"}"
echo
echo "===== ALICE DELETEs BOB's note id=3 (expect 0 rows -> 404) ====="
curl -s -w "HTTP %{http_code}\n" -X DELETE "$BASE?id=eq.3" "${AUTH_ALICE[@]}"

===== ALICE INSERTs her own note (expect 201) =====
[{"id":5,"user_id":"6a1e8ead-77f8-4a45-9a93-d0ff25813d78","title":"temp-test","body":"should be removed"}]HTTP 201

===== ALICE INSERTs a note under BOB's user_id (expect 403) =====
{"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}HTTP 403

===== ALICE UPDATEs her own note id=2 to same title (expect 204, data unchanged) =====
HTTP 204

===== ALICE tries to UPDATE BOB's note id=3 (expect 0 rows -> 404) =====
HTTP 204

===== ALICE DELETEs BOB's note id=3 (expect 0 rows -> 404) =====
HTTP 204

#10exit 0

BASE="https://<ref>.supabase.co/rest/v1/notes"
ALICE_TOKEN=$(cat /tmp/alice.jwt); ALICE_ID=$(cat /tmp/alice.id)
BOB_TOKEN=$(cat /tmp/bob.jwt); BOB_ID=$(cat /tmp/bob.id)
AUTH_ALICE=(-H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN")
AUTH_BOB=(-H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $BOB_TOKEN")

echo "===== BOB confirms his note id=3 still intact (not deleted/modified) ====="
curl -s -w "HTTP %{http_code}\n" "$BASE?id=eq.3&select=id,title" "${AUTH_BOB[@]}"
echo
echo "===== ALICE deletes her own temp note id=5 (cleanup) ====="
curl -s -w "HTTP %{http_code}\n" -X DELETE "$BASE?id=eq.5" "${AUTH_ALICE[@]}"
echo
echo "===== Final state via service_role (all rows, no RLS) — expect 4 notes: alice 2, bob 2 ====="
psql "$SUPABASE_DB_URL" -c "SELECT id, user_id, title FROM public.notes ORDER BY id;" 2>&1

===== BOB confirms his note id=3 still intact (not deleted/modified) =====
[{"id":3,"title":"Gym plan"}]HTTP 200

===== ALICE deletes her own temp note id=5 (cleanup) =====
HTTP 204

===== Final state via service_role (all rows, no RLS) — expect 4 notes: alice 2, bob 2 =====
 id |               user_id                |    title     
----+--------------------------------------+--------------
  1 | 6a1e8ead-77f8-4a45-9a93-d0ff25813d78 | Groceries
  2 | 6a1e8ead-77f8-4a45-9a93-d0ff25813d78 | Call plumber
  3 | 5825376d-fa1a-433e-962a-ce5e452d35bb | Gym plan
  4 | 5825376d-fa1a-433e-962a-ce5e452d35bb | Trip ideas
(4 rows)

#11exit 0

rm -f /tmp/alice.jwt /tmp/bob.jwt /tmp/alice.id /tmp/bob.id
echo "cleaned"

cleaned

What it said at the end

## Summary I locked down `public.notes` on the hosted Supabase project so notes are owner-only. **What was wrong:** RLS was disabled (`rowsecurity = f`) and both `anon` and `authenticated` roles had full table grants — so anyone (even anon) could read/write every row via the REST API. **The fix (run via the DB connection):** 1. `ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY;` — with no matching policies, `anon`/`authenticated` see nothing by default. 2. Created four owner-scoped policies on the `authenticated` role using `auth.uid()`: - **SELECT** — `USING (auth.uid() = user_id)` - **INSERT** — `WITH CHECK (auth.uid() = user_id)` (blocks writing someone else's `user_id`) - **UPDATE** — `USING` + `WITH CHECK (auth.uid() = user_id)` - **DELETE** — `USING (auth.uid() = user_id)` `service_role` (used for admin/backups) bypasses RLS as intended, so legitimate owners and internal tooling keep working. **Verified through the REST API:** - Anon (anon key only) → **0 rows**. - Alice → only her 2 notes; Bob → only his 2 notes; each isolated from the other. - Alice inserting a note under Bob's `user_id` → **403** (RLS violation). - Alice updating/deleting Bob's row → **0 affected rows** (policy filters it out). - Owners can still SELECT / INSERT / UPDATE / DELETE their own rows (201/204). - Existing data (Alice's 2 + Bob's 2 notes) was untouched; my temporary test note was removed — final state is exactly the original 4 notes.

11 earlier narration turn(s) are in the raw transcript.

How it was graded

A shell script executed against the live project and asserted on the state the agent left behind. No model judged another model.

exit 0 OK

Check it yourself

Raw transcript · Task definition and verifier · Every attempt