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

tencent/hy3 · d1_rls_owner · rep 1

pass
model
tencent/hy3
task
d1_rls_owner
rep
1
day
1
steps
8
tokens
35,332
est. cost
$0.011
agent time
76s
wave
s4c
started
2026-07-26T02:00:17Z

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 "=== ENV VARS ===" && env | grep -i supabase; echo "=== TOOLS ===" && which psql curl jq supabase 2>/dev/null; echo "=== psql version ===" && psql --version 2>/dev/null
=== ENV VARS ===
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>
=== TOOLS ===
/usr/bin/psql
/usr/bin/curl
/usr/bin/jq
/usr/bin/supabase
=== psql version ===
psql (PostgreSQL) 18.4 (Debian 18.4-1.pgdg12+1)
#2exit 0
cd /tmp && export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -X -P pager=off <<'SQL'
SELECT '--- table columns ---' AS label;
SELECT column_name, data_type, is_nullable
FROM information_schema.columns
WHERE table_schema='public' AND table_name='notes'
ORDER BY ordinal_position;

SELECT '--- RLS enabled? ---' AS label;
SELECT relname, relrowsecurity
FROM pg_class c JOIN pg_namespace n ON n.oid=c.relnamespace
WHERE n.nspname='public' AND c.relname='notes';

SELECT '--- existing policies ---' AS label;
SELECT polname AS policy_name, cmd, qual, with_check
FROM pg_policies
WHERE schemaname='public' AND tablename='notes';

SELECT '--- roles that can access table (grants) ---' AS label;
SELECT grantee, privilege_type
FROM information_schema.role_table_grants
WHERE table_schema='public' AND table_name='notes';
SQL
         label         
-----------------------
 --- table columns ---
(1 row)

 column_name | data_type | is_nullable 
-------------+-----------+-------------
 id          | bigint    | NO
 user_id     | uuid      | NO
 title       | text      | NO
 body        | text      | NO
(4 rows)

        label         
----------------------
 --- RLS enabled? ---
(1 row)

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

           label           
---------------------------
 --- existing policies ---
(1 row)

                    label                     
----------------------------------------------
 --- roles that can access table (grants) ---
(1 row)

    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)

ERROR:  column "polname" does not exist
LINE 1: SELECT polname AS policy_name, cmd, qual, with_check
               ^
HINT:  Perhaps you meant to reference the column "pg_policies.policyname".
#3exit 0
cd /tmp
echo "=== REST API with anon key (before lockdown) — should currently show ALL rows ==="
curl -s "$SUPABASE_URL/rest/v1/notes?select=id,user_id,title" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $SUPABASE_ANON_KEY" | jq .
echo
echo "=== Users ==="
psql "$SUPABASE_DB_URL" -X -P pager=off -c "SELECT id, email FROM auth.users WHERE email IN ('alice@cari.dev','bob@cari.dev');"
echo "=== Notes per user ==="
psql "$SUPABASE_DB_URL" -X -P pager=off -c "SELECT user_id, count(*) FROM public.notes GROUP BY user_id;"
=== REST API with anon key (before lockdown) — should currently show ALL rows ===
[
  {
    "id": 1,
    "user_id": "d431137a-7a0e-4e17-a478-9fb490790a2a",
    "title": "Groceries"
  },
  {
    "id": 2,
    "user_id": "d431137a-7a0e-4e17-a478-9fb490790a2a",
    "title": "Call plumber"
  },
  {
    "id": 3,
    "user_id": "0b3c467f-f7ce-4cea-8f83-665c0bbcb2b0",
    "title": "Gym plan"
  },
  {
    "id": 4,
    "user_id": "0b3c467f-f7ce-4cea-8f83-665c0bbcb2b0",
    "title": "Trip ideas"
  }
]

=== Users ===
                  id                  |     email      
--------------------------------------+----------------
 d431137a-7a0e-4e17-a478-9fb490790a2a | alice@cari.dev
 0b3c467f-f7ce-4cea-8f83-665c0bbcb2b0 | bob@cari.dev
(2 rows)

=== Notes per user ===
               user_id                | count 
--------------------------------------+-------
 d431137a-7a0e-4e17-a478-9fb490790a2a |     2
 0b3c467f-f7ce-4cea-8f83-665c0bbcb2b0 |     2
(2 rows)

#4exit 0
cd /tmp && export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -X -P pager=off -v ON_ERROR_STOP=1 <<'SQL'
-- 1) Enable Row Level Security on the notes table
ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY;

-- Drop any pre-existing policies (defensive; table currently has none)
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;

-- 2) SELECT: owners see only their own rows.
--    For anon (auth.uid() = NULL) the expression is never true -> 0 rows.
CREATE POLICY "notes_select_own" ON public.notes
  FOR SELECT TO authenticated, anon
  USING (auth.uid() = user_id);

-- 3) INSERT: must set user_id to the caller's own id (blocks other users' ids).
CREATE POLICY "notes_insert_own" ON public.notes
  FOR INSERT TO authenticated, anon
  WITH CHECK (auth.uid() = user_id);

-- 4) UPDATE: only own rows, and cannot reassign user_id to someone else.
CREATE POLICY "notes_update_own" ON public.notes
  FOR UPDATE TO authenticated, anon
  USING (auth.uid() = user_id)
  WITH CHECK (auth.uid() = user_id);

-- 5) DELETE: only own rows.
CREATE POLICY "notes_delete_own" ON public.notes
  FOR DELETE TO authenticated, anon
  USING (auth.uid() = user_id);
SQL
echo "EXIT=$?"
ALTER TABLE
DROP POLICY
DROP POLICY
DROP POLICY
DROP POLICY
CREATE POLICY
CREATE POLICY
CREATE POLICY
CREATE POLICY
EXIT=0
NOTICE:  policy "notes_select_own" for relation "public.notes" does not exist, skipping
NOTICE:  policy "notes_insert_own" for relation "public.notes" does not exist, skipping
NOTICE:  policy "notes_update_own" for relation "public.notes" does not exist, skipping
NOTICE:  policy "notes_delete_own" for relation "public.notes" does not exist, skipping
#5exit 0
cd /tmp && export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -X -P pager=off -c "SELECT schemaname, tablename, policyname, roles, cmd, qual, with_check FROM pg_policies WHERE tablename='notes';"
psql "$SUPABASE_DB_URL" -X -P pager=off -c "SELECT relname, relrowsecurity FROM pg_class c JOIN pg_namespace n ON n.oid=c.relnamespace WHERE n.nspname='public' AND relname='notes';"
 schemaname | tablename |    policyname    |        roles         |  cmd   |          qual          |       with_check       
------------+-----------+------------------+----------------------+--------+------------------------+------------------------
 public     | notes     | notes_select_own | {anon,authenticated} | SELECT | (auth.uid() = user_id) | 
 public     | notes     | notes_insert_own | {anon,authenticated} | INSERT |                        | (auth.uid() = user_id)
 public     | notes     | notes_update_own | {anon,authenticated} | UPDATE | (auth.uid() = user_id) | (auth.uid() = user_id)
 public     | notes     | notes_delete_own | {anon,authenticated} | DELETE | (auth.uid() = user_id) | 
(4 rows)

 relname | relrowsecurity 
---------+----------------
 notes   | t
(1 row)

#6exit 0
cd /tmp
BASE="$SUPABASE_URL"
AKEY="$SUPABASE_ANON_KEY"

# Helper: sign in and echo "email user_id token"
login() {
  local email="$1" pass="$2"
  local resp
  resp=$(curl -s "$BASE/auth/v1/token?grant_type=password" \
    -H "apikey: $AKEY" -H "Content-Type: application/json" \
    -d "{\"email\":\"$email\",\"password\":\"$pass\"}")
  local uid token
  uid=$(echo "$resp" | jq -r .user.id)
  token=$(echo "$resp" | jq -r .access_token)
  echo "$uid|$token"
}

ALICE=$(login "alice@cari.dev" "Passw0rd-alice-42")
BOB=$(login "bob@cari.dev" "Passw0rd-bob-58")
A_UID=${ALICE%%|*}; A_TOK=${ALICE##*|}
B_UID=${BOB%%|*};    B_TOK=${BOB##*|}
echo "alice uid: $A_UID"
echo "bob   uid: $B_UID"

get() { curl -s "$BASE/rest/v1/notes$1" -H "apikey: $AKEY" -H "Authorization: Bearer $2"; }

echo; echo "=== 1) ANON (anon key only) — expect EMPTY ==="
curl -s "$BASE/rest/v1/notes?select=id,user_id,title" -H "apikey: $AKEY" | jq 'length'

echo "=== 2) ALICE select — expect her 2 rows (1,2) ==="
get "?select=id,user_id,title" "$A_TOK" | jq .

echo "=== 3) ALICE cannot see BOB's rows (try selecting bob's note id=3) ==="
get "?id=eq.3&select=id,user_id,title" "$A_TOK" | jq .

echo "=== 4) ALICE insert with her OWN user_id — expect 201/created ==="
curl -s -o /dev/null -w "%{http_code}\n" -X POST "$BASE/rest/v1/notes" \
  -H "apikey: $AKEY" -H "Authorization: Bearer $A_TOK" \
  -H "Content-Type: application/json" -H "Prefer: return=representation" \
  -d "{\"user_id\":\"$A_UID\",\"title\":\"Alice temp test\",\"body\":\"cleanup me\"}"

echo "=== 5) ALICE tries to insert with BOB's user_id — expect 403 ==="
curl -s -o /dev/null -w "%{http_code}\n" -X POST "$BASE/rest/v1/notes" \
  -H "apikey: $AKEY" -H "Authorization: Bearer $A_TOK" \
  -H "Content-Type: application/json" -H "Prefer: return=representation" \
  -d "{\"user_id\":\"$B_UID\",\"title\":\"spoof as bob\",\"body\":\"x\"}"

echo "=== 6) ALICE update her own note id=1 — expect 200 ==="
curl -s -o /dev/null -w "%{http_code}\n" -X PATCH "$BASE/rest/v1/notes?id=eq.1" \
  -H "apikey: $AKEY" -H "Authorization: Bearer $A_TOK" \
  -H "Content-Type: application/json" -H "Prefer: return=representation" \
  -d "{\"title\":\"Groceries (RLS ok)\"}"

echo "=== 7) ALICE tries to update BOB's note id=3 — expect 0 rows affected (200 but empty) ==="
curl -s "$BASE/rest/v1/notes?id=eq.3" -X PATCH \
  -H "apikey: $AKEY" -H "Authorization: Bearer $A_TOK" \
  -H "Content-Type: application/json" -H "Prefer: return=representation" \
  -d "{\"title\":\"hacked bob\"}" | jq .

echo "=== 8) ALICE tries to delete BOB's note id=4 — expect 0 rows affected ==="
curl -s -o /dev/null -w "%{http_code}\n" -X DELETE "$BASE/rest/v1/notes?id=eq.4" \
  -H "apikey: $AKEY" -H "Authorization: Bearer $A_TOK"

echo "=== 9) BOB select — expect his 2 rows (3,4) ==="
get "?select=id,user_id,title" "$B_TOK" | jq .
alice uid: d431137a-7a0e-4e17-a478-9fb490790a2a
bob   uid: 0b3c467f-f7ce-4cea-8f83-665c0bbcb2b0

=== 1) ANON (anon key only) — expect EMPTY ===
0
=== 2) ALICE select — expect her 2 rows (1,2) ===
[
  {
    "id": 1,
    "user_id": "d431137a-7a0e-4e17-a478-9fb490790a2a",
    "title": "Groceries"
  },
  {
    "id": 2,
    "user_id": "d431137a-7a0e-4e17-a478-9fb490790a2a",
    "title": "Call plumber"
  }
]
=== 3) ALICE cannot see BOB's rows (try selecting bob's note id=3) ===
[]
=== 4) ALICE insert with her OWN user_id — expect 201/created ===
201
=== 5) ALICE tries to insert with BOB's user_id — expect 403 ===
403
=== 6) ALICE update her own note id=1 — expect 200 ===
200
=== 7) ALICE tries to update BOB's note id=3 — expect 0 rows affected (200 but empty) ===
[]
=== 8) ALICE tries to delete BOB's note id=4 — expect 0 rows affected ===
204
=== 9) BOB select — expect his 2 rows (3,4) ===
[
  {
    "id": 3,
    "user_id": "0b3c467f-f7ce-4cea-8f83-665c0bbcb2b0",
    "title": "Gym plan"
  },
  {
    "id": 4,
    "user_id": "0b3c467f-f7ce-4cea-8f83-665c0bbcb2b0",
    "title": "Trip ideas"
  }
]
#7exit 0
cd /tmp && export PGPASSWORD="$SUPABASE_DB_PASSWORD"
echo "=== current notes state ==="
psql "$SUPABASE_DB_URL" -X -P pager=off -c "SELECT id, user_id, title, body FROM public.notes ORDER BY id;"
echo "=== restoring note 1 title + deleting temp test note ==="
psql "$SUPABASE_DB_URL" -X -P pager=off -v ON_ERROR_STOP=1 <<'SQL'
UPDATE public.notes SET title = 'Groceries', body = body WHERE id = 1;
DELETE FROM public.notes WHERE title = 'Alice temp test' AND body = 'cleanup me';
SQL
echo "=== final notes state (must be original 4) ==="
psql "$SUPABASE_DB_URL" -X -P pager=off -c "SELECT id, user_id, title FROM public.notes ORDER BY id;"
=== current notes state ===
 id |               user_id                |       title        |         body         
----+--------------------------------------+--------------------+----------------------
  1 | d431137a-7a0e-4e17-a478-9fb490790a2a | Groceries (RLS ok) | milk, eggs, coffee
  2 | d431137a-7a0e-4e17-a478-9fb490790a2a | Call plumber       | kitchen sink leaks
  3 | 0b3c467f-f7ce-4cea-8f83-665c0bbcb2b0 | Gym plan           | push pull legs
  4 | 0b3c467f-f7ce-4cea-8f83-665c0bbcb2b0 | Trip ideas         | mountains in october
  5 | d431137a-7a0e-4e17-a478-9fb490790a2a | Alice temp test    | cleanup me
(5 rows)

=== restoring note 1 title + deleting temp test note ===
UPDATE 1
DELETE 1
=== final notes state (must be original 4) ===
 id |               user_id                |    title     
----+--------------------------------------+--------------
  1 | d431137a-7a0e-4e17-a478-9fb490790a2a | Groceries
  2 | d431137a-7a0e-4e17-a478-9fb490790a2a | Call plumber
  3 | 0b3c467f-f7ce-4cea-8f83-665c0bbcb2b0 | Gym plan
  4 | 0b3c467f-f7ce-4cea-8f83-665c0bbcb2b0 | Trip ideas
(4 rows)

#8exit 0
cd /tmp
echo "=== FINAL VERIFY: anon REST (expect 0 rows) ==="
curl -s "$SUPABASE_URL/rest/v1/notes?select=id" -H "apikey: $SUPABASE_ANON_KEY" | jq 'length'
echo "=== FINAL VERIFY: alice REST still works (expect 2 rows) ==="
ATOK=$(curl -s "$SUPABASE_URL/auth/v1/token?grant_type=password" -H "apikey: $SUPABASE_ANON_KEY" -H "Content-Type: application/json" -d '{"email":"alice@cari.dev","password":"Passw0rd-alice-42"}' | jq -r .access_token)
curl -s "$SUPABASE_URL/rest/v1/notes?select=id,title" -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ATOK" | jq .
=== FINAL VERIFY: anon REST (expect 0 rows) ===
0
=== FINAL VERIFY: alice REST still works (expect 2 rows) ===
[
  {
    "id": 2,
    "title": "Call plumber"
  },
  {
    "id": 1,
    "title": "Groceries"
  }
]

What it said at the end

Done. The `public.notes` table is now locked down to owner-only access. ## What I did **Root cause:** RLS was disabled on `public.notes`, and both the `anon` and `authenticated` roles had full CRUD grants — so the anon REST key returned every user's notes. **Fix (via direct DB connection):** 1. `ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY;` 2. Created 4 owner-scoped policies keyed on `auth.uid() = user_id`: - **SELECT** — `USING (auth.uid() = user_id)` → anon (`auth.uid()` is null) sees 0 rows automatically; owners see only theirs. - **INSERT** — `WITH CHECK (auth.uid() = user_id)` → a user cannot insert a row with someone else's `user_id` (returns 403). - **UPDATE** — `USING (auth.uid() = user_id) WITH CHECK (auth.uid() = user_id)` → only own rows, and `user_id` can't be reassigned. - **DELETE** — `USING (auth.uid() = user_id)` → only own rows. Policies were granted to both `anon` and `authenticated` (so the anon path is covered by the `auth.uid()` check, while `service_role` bypasses RLS as intended). **Verification through the live REST API (all passed):** - Anon key → **0 rows**. - Alice → sees only her 2 notes (1,2); Bob only his (3,4). - Alice cannot read/update/delete Bob's rows (empty results). - Alice inserting with her own `user_id` → 201; with Bob's `user_id` → **403**. - Alice can update her own row (200). **Data integrity:** I temporarily inserted a test note and patched a title during testing, then used the service role to restore the table to its exact original 4-note state. No production data was modified.

8 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