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

minimax/minimax-m3 · d1_rls_owner · rep 2

pass
model
minimax/minimax-m3
task
d1_rls_owner
rep
2
day
1
steps
8
tokens
23,275
est. cost
$0.016
agent time
48s
wave
s4c
started
2026-07-26T02:24:22Z

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 — 8 commands

#1exit 0
echo "URL: $SUPABASE_URL"; echo "REF: $SUPABASE_PROJECT_REF"; echo "DB_URL: $SUPABASE_DB_URL"
URL: https://<ref>.supabase.co
REF: <ref>
DB_URL: <redacted:SUPABASE_DB_URL>
#2exit 0
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -c "\d public.notes"
                            Table "public.notes"
 Column  |  Type  | Collation | Nullable |             Default              
---------+--------+-----------+----------+----------------------------------
 id      | bigint |           | not null | generated by default as identity
 user_id | uuid   |           | not null | 
 title   | text   |           | not null | 
 body    | text   |           | not null | ''::text
Indexes:
    "notes_pkey" PRIMARY KEY, btree (id)
Foreign-key constraints:
    "notes_user_id_fkey" FOREIGN KEY (user_id) REFERENCES auth.users(id) ON DELETE CASCADE
#3exit 0
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" <<'SQL'
\d+ public.notes
SELECT relname, relrowsecurity, relforcerowsecurity FROM pg_class WHERE relname='notes';
SELECT schemaname, tablename, policyname, permissive, roles, cmd, qual, with_check FROM pg_policies WHERE tablename='notes';
SELECT grantee, privilege_type FROM information_schema.table_privileges WHERE table_name='notes' AND table_schema='public';
SELECT proname, pronargs FROM pg_proc WHERE proname IN ('uid');
SQL
                                                       Table "public.notes"
 Column  |  Type  | Collation | Nullable |             Default              | Storage  | Compression | Stats target | Description 
---------+--------+-----------+----------+----------------------------------+----------+-------------+--------------+-------------
 id      | bigint |           | not null | generated by default as identity | plain    |             |              | 
 user_id | uuid   |           | not null |                                  | plain    |             |              | 
 title   | text   |           | not null |                                  | extended |             |              | 
 body    | text   |           | not null | ''::text                         | extended |             |              | 
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
Access method: heap

 relname | relrowsecurity | relforcerowsecurity 
---------+----------------+---------------------
 notes   | f              | f
(1 row)

 schemaname | tablename | policyname | permissive | roles | cmd | qual | with_check 
------------+-----------+------------+------------+-------+-----+------+------------
(0 rows)

    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)

 proname | pronargs 
---------+----------
 uid     |        0
(1 row)
#4exit 0
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" <<'SQL'
SELECT id, email FROM auth.users WHERE email IN ('alice@cari.dev','bob@cari.dev');
SELECT n.id, n.user_id, n.title FROM public.notes n;
SQL
                  id                  |     email      
--------------------------------------+----------------
 04a1b2af-56f7-49cd-b65b-371c6b16d6fe | alice@cari.dev
 dcc15199-a1cf-41d8-b930-c5b59aa75825 | bob@cari.dev
(2 rows)

 id |               user_id                |    title     
----+--------------------------------------+--------------
  1 | 04a1b2af-56f7-49cd-b65b-371c6b16d6fe | Groceries
  2 | 04a1b2af-56f7-49cd-b65b-371c6b16d6fe | Call plumber
  3 | dcc15199-a1cf-41d8-b930-c5b59aa75825 | Gym plan
  4 | dcc15199-a1cf-41d8-b930-c5b59aa75825 | Trip ideas
(4 rows)
#5exit 0
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" <<'SQL'
ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY;
ALTER TABLE public.notes FORCE ROW LEVEL SECURITY;
SQL
echo "---"
psql "$SUPABASE_DB_URL" -c "SELECT relname, relrowsecurity, relforcerowsecurity FROM pg_class WHERE relname='notes';"
ALTER TABLE
ALTER TABLE
---
 relname | relrowsecurity | relforcerowsecurity 
---------+----------------+---------------------
 notes   | t              | t
(1 row)
#6exit 0
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" <<'SQL'
DROP POLICY IF EXISTS notes_owner_select ON public.notes;
DROP POLICY IF EXISTS notes_owner_insert ON public.notes;
DROP POLICY IF EXISTS notes_owner_update ON public.notes;
DROP POLICY IF EXISTS notes_owner_delete ON public.notes;

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

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

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

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

SELECT policyname, roles, cmd, qual, with_check FROM pg_policies WHERE tablename='notes';
SQL
DROP POLICY
DROP POLICY
DROP POLICY
DROP POLICY
CREATE POLICY
CREATE POLICY
CREATE POLICY
CREATE POLICY
     policyname     |      roles      |  cmd   |          qual          |       with_check       
--------------------+-----------------+--------+------------------------+------------------------
 notes_owner_select | {authenticated} | SELECT | (user_id = auth.uid()) | 
 notes_owner_insert | {authenticated} | INSERT |                        | (user_id = auth.uid())
 notes_owner_update | {authenticated} | UPDATE | (user_id = auth.uid()) | (user_id = auth.uid())
 notes_owner_delete | {authenticated} | DELETE | (user_id = auth.uid()) | 
(4 rows)


NOTICE:  policy "notes_owner_select" for relation "public.notes" does not exist, skipping
NOTICE:  policy "notes_owner_insert" for relation "public.notes" does not exist, skipping
NOTICE:  policy "notes_owner_update" for relation "public.notes" does not exist, skipping
NOTICE:  policy "notes_owner_delete" for relation "public.notes" does not exist, skipping
#7exit 0
set -e
ALICE_ID="04a1b2af-56f7-49cd-b65b-371c6b16d6fe"
BOB_ID="dcc15199-a1cf-41d8-b930-c5b59aa75825"

login() {
  local email="$1" pass="$2"
  curl -sS -X POST "$SUPABASE_URL/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; print(json.load(sys.stdin)['access_token'])"
}

ALICE_TOKEN=$(login alice@cari.dev 'Passw0rd-alice-42')
BOB_TOKEN=$(login bob@cari.dev 'Passw0rd-bob-58')
echo "alice token len: ${#ALICE_TOKEN}, bob token len: ${#BOB_TOKEN}"

echo "--- anon GET /notes (should be 0 rows) ---"
curl -sS -H "apikey: $SUPABASE_ANON_KEY" "$SUPABASE_URL/rest/v1/notes" | head -c 400; echo

echo "--- alice GET /notes (should see 2 of her own) ---"
curl -sS -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" "$SUPABASE_URL/rest/v1/notes" | head -c 400; echo

echo "--- bob GET /notes (should see 2 of his own, none of alice's) ---"
curl -sS -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $BOB_TOKEN" "$SUPABASE_URL/rest/v1/notes" | head -c 400; echo

echo "--- alice INSERT with her own user_id (should succeed) ---"
curl -sS -X POST -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" -H "Content-Type: application/json" \
  -d "{\"user_id\":\"$ALICE_ID\",\"title\":\"test-alice\",\"body\":\"x\"}" "$SUPABASE_URL/rest/v1/notes" -w "\nHTTP %{http_code}\n"

echo "--- alice INSERT with bob's user_id (should fail 401/403) ---"
curl -sS -X POST -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" -H "Content-Type: application/json" \
  -d "{\"user_id\":\"$BOB_ID\",\"title\":\"evil\",\"body\":\"x\"}" "$SUPABASE_URL/rest/v1/notes" -w "\nHTTP %{http_code}\n"

echo "--- bob UPDATE alice's note id=1 (should be 0 rows affected) ---"
curl -sS -X PATCH -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $BOB_TOKEN" -H "Content-Type: application/json" \
  -d "{\"title\":\"hacked\"}" "$SUPABASE_URL/rest/v1/notes?id=eq.1" -w "\nHTTP %{http_code}\n"

echo "--- bob DELETE alice's note id=1 (should be 0 rows) ---"
curl -sS -X DELETE -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $BOB_TOKEN" "$SUPABASE_URL/rest/v1/notes?id=eq.1" -w "\nHTTP %{http_code}\n"

echo "--- alice's note 1 title after attempted attack (must be unchanged 'Groceries') ---"
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -c "SELECT id, user_id, title FROM public.notes ORDER BY id;"

echo "--- cleanup: delete the alice test row inserted above ---"
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -c "DELETE FROM public.notes WHERE title='test-alice';"
psql "$SUPABASE_DB_URL" -c "SELECT id, title FROM public.notes ORDER BY id;"
alice token len: 791, bob token len: 788
--- anon GET /notes (should be 0 rows) ---
[]
--- alice GET /notes (should see 2 of her own) ---
[{"id":1,"user_id":"04a1b2af-56f7-49cd-b65b-371c6b16d6fe","title":"Groceries","body":"milk, eggs, coffee"}, 
 {"id":2,"user_id":"04a1b2af-56f7-49cd-b65b-371c6b16d6fe","title":"Call plumber","body":"kitchen sink leaks"}]
--- bob GET /notes (should see 2 of his own, none of alice's) ---
[{"id":3,"user_id":"dcc15199-a1cf-41d8-b930-c5b59aa75825","title":"Gym plan","body":"push pull legs"}, 
 {"id":4,"user_id":"dcc15199-a1cf-41d8-b930-c5b59aa75825","title":"Trip ideas","body":"mountains in october"}]
--- alice INSERT with her own user_id (should succeed) ---

HTTP 201
--- alice INSERT with bob's user_id (should fail 401/403) ---
{"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}
HTTP 403
--- bob UPDATE alice's note id=1 (should be 0 rows affected) ---

HTTP 204
--- bob DELETE alice's note id=1 (should be 0 rows) ---

HTTP 204
--- alice's note 1 title after attempted attack (must be unchanged 'Groceries') ---
 id |               user_id                |    title     
----+--------------------------------------+--------------
  1 | 04a1b2af-56f7-49cd-b65b-371c6b16d6fe | Groceries
  2 | 04a1b2af-56f7-49cd-b65b-371c6b16d6fe | Call plumber
  3 | dcc15199-a1cf-41d8-b930-c5b59aa75825 | Gym plan
  4 | dcc15199-a1cf-41d8-b930-c5b59aa75825 | Trip ideas
  5 | 04a1b2af-56f7-49cd-b65b-371c6b16d6fe | test-alice
(5 rows)

--- cleanup: delete the alice test row inserted above ---
DELETE 1
 id |    title     
----+--------------
  1 | Groceries
  2 | Call plumber
  3 | Gym plan
  4 | Trip ideas
(4 rows)
#8exit 0
ALICE_ID="04a1b2af-56f7-49cd-b65b-371c6b16d6fe"
ALICE_TOKEN=$(curl -sS -X POST "$SUPABASE_URL/auth/v1/token?grant_type=password" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Content-Type: application/json" \
  -d '{"email":"alice@cari.dev","password":"Passw0rd-alice-42"}' | python3 -c "import sys,json; print(json.load(sys.stdin)['access_token'])")

echo "--- alice inserts her own note ---"
INS=$(curl -sS -X POST -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" -H "Content-Type: application/json" \
  -H "Prefer: return=representation" \
  -d "{\"user_id\":\"$ALICE_ID\",\"title\":\"owner-flow\",\"body\":\"hi\"}" "$SUPABASE_URL/rest/v1/notes")
echo "$INS"
NEW_ID=$(echo "$INS" | python3 -c "import sys,json; print(json.load(sys.stdin)[0]['id'])")
echo "new id: $NEW_ID"

echo "--- alice updates it ---"
curl -sS -X PATCH -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" -H "Content-Type: application/json" \
  -H "Prefer: return=representation" \
  -d '{"title":"owner-flow-updated"}' "$SUPABASE_URL/rest/v1/notes?id=eq.$NEW_ID"
echo

echo "--- alice deletes it ---"
curl -sS -X DELETE -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H "Prefer: return=representation" "$SUPABASE_URL/rest/v1/notes?id=eq.$NEW_ID"
echo

echo "--- final notes (should still be exactly the 4 originals) ---"
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -c "SELECT id, user_id, title FROM public.notes ORDER BY id;"
--- alice inserts her own note ---
[{"id":7,"user_id":"04a1b2af-56f7-49cd-b65b-371c6b16d6fe","title":"owner-flow","body":"hi"}]
new id: 7
--- alice updates it ---
[{"id":7,"user_id":"04a1b2af-56f7-49cd-b65b-371c6b16d6fe","title":"owner-flow-updated","body":"hi"}]
--- alice deletes it ---
[{"id":7,"user_id":"04a1b2af-56f7-49cd-b65b-371c6b16d6fe","title":"owner-flow-updated","body":"hi"}]
--- final notes (should still be exactly the 4 originals) ---
 id |               user_id                |    title     
----+--------------------------------------+--------------
  1 | 04a1b2af-56f7-49cd-b65b-371c6b16d6fe | Groceries
  2 | 04a1b2af-56f7-49cd-b65b-371c6b16d6fe | Call plumber
  3 | dcc15199-a1cf-41d8-b930-c5b59aa75825 | Gym plan
  4 | dcc15199-a1cf-41d8-b930-c5b59aa75825 | Trip ideas
(4 rows)

What it said at the end

Everything works. Here's a summary of what I did: **Problem:** `public.notes` had no RLS and full table privileges granted to `anon`/`authenticated`, so the REST API exposed every user's notes to everyone. **Fix applied to `public.notes`:** 1. `ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY;` 2. `ALTER TABLE public.notes FORCE ROW LEVEL SECURITY;` (so even table owners are subject to policies) 3. Created four policies for the `authenticated` role only: - `notes_owner_select` FOR SELECT — `USING (user_id = auth.uid())` - `notes_owner_insert` FOR INSERT — `WITH CHECK (user_id = auth.uid())` - `notes_owner_update` FOR UPDATE — `USING (user_id = auth.uid()) WITH CHECK (user_id = auth.uid())` - `notes_owner_delete` FOR DELETE — `USING (user_id = auth.uid())` 4. No policies for `anon` → anon gets zero rows by default under RLS. **Verification via REST API (anon key + JWT):** - anon GET → `[]` ✅ - alice GET → only her 2 notes; bob GET → only his 2 notes ✅ - alice INSERT with her own `user_id` → 201 ✅; with bob's `user_id` → 403 "new row violates row-level security policy" ✅ - bob PATCH/DELETE on alice's note id=1 → 204 with 0 rows affected; title remained "Groceries" ✅ - Full owner insert→update→delete cycle for alice works ✅ The existing 4 notes are untouched.

2 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