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

moonshotai/kimi-k3 · d1_rls_owner · rep 1

pass

model

moonshotai/kimi-k3

task

d1_rls_owner

rep

day

steps

tokens

20,460

est. cost

$0.153

agent time

165s

wave

started

2026-07-24T04:47:59Z

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 — 9 commands

#1exit 0

env | grep -i supabase | sed 's/\(KEY=.\{20\}\).*/\1.../; s/\(PASSWORD=.\{6\}\).*/\1.../'

SUPABASE_DB_PASSWORD=1a9f7b...
SUPABASE_DB_URL=<redacted:SUPABASE_DB_URL>
SUPABASE_URL=https://<ref>.supabase.co
SUPABASE_SERVICE_ROLE_KEY=eyJhbGciOiJIUzI1NiIs...
SUPABASE_PROJECT_REF=<ref>
SUPABASE_ANON_KEY=eyJhbGciOiJIUzI1NiIs...

#2exit 0

which psql curl jq python3 2>/dev/null; psql --version 2>/dev/null

/usr/bin/psql
/usr/bin/curl
/usr/bin/jq
/usr/bin/python3
psql (PostgreSQL) 18.4 (Debian 18.4-1.pgdg12+1)

#3exit 0

psql "$SUPABASE_DB_URL" -c "\d public.notes" -c "SELECT polname, polcmd, polpermissive, polroles, pg_get_expr(polqual, polrelid) AS using_expr, pg_get_expr(polwithcheck, polrelid) AS check_expr FROM pg_policy WHERE polrelid = 'public.notes'::regclass;" -c "SELECT relname, relrowsecurity, relforcerowsecurity FROM pg_class WHERE relname='notes' AND relnamespace='public'::regnamespace;"

                            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

 polname | polcmd | polpermissive | polroles | using_expr | check_expr 
---------+--------+---------------+----------+------------+------------
(0 rows)

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

#4exit 0

curl -s "$SUPABASE_URL/rest/v1/notes?select=id,title,user_id" -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $SUPABASE_ANON_KEY" | head -c 2000; echo

[{"id":1,"title":"Groceries","user_id":"12ba8851-9de4-413e-8418-2b5fb8d23607"}, 
 {"id":2,"title":"Call plumber","user_id":"12ba8851-9de4-413e-8418-2b5fb8d23607"}, 
 {"id":3,"title":"Gym plan","user_id":"a395f8d9-a57f-41ff-a4c9-c90a1062eb56"}, 
 {"id":4,"title":"Trip ideas","user_id":"a395f8d9-a57f-41ff-a4c9-c90a1062eb56"}]

#5exit 0

cat > /tmp/rls.sql <<'EOF'
BEGIN;

-- Enable RLS (no FORCE: table owner postgres / service_role keeps bypassing, matching Supabase defaults)
ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY;

-- Owner-only policies, scoped to the authenticated role.
-- auth.uid() returns the JWT sub (NULL for anon requests), so anon matches nothing.
CREATE POLICY "notes_select_own" ON public.notes
  FOR SELECT TO authenticated
  USING (user_id = auth.uid());

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

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

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

COMMIT;

SELECT polname, polcmd, pg_get_expr(polqual, polrelid) AS using_expr, pg_get_expr(polwithcheck, polrelid) AS check_expr
FROM pg_policy WHERE polrelid = 'public.notes'::regclass ORDER BY polname;
EOF
psql "$SUPABASE_DB_URL" -f /tmp/rls.sql

BEGIN
ALTER TABLE
CREATE POLICY
CREATE POLICY
CREATE POLICY
CREATE POLICY
COMMIT
     polname      | polcmd |       using_expr       |       check_expr       
------------------+--------+------------------------+------------------------
 notes_delete_own | d      | (user_id = auth.uid()) | 
 notes_insert_own | a      |                        | (user_id = auth.uid())
 notes_select_own | r      | (user_id = auth.uid()) | 
 notes_update_own | w      | (user_id = auth.uid()) | (user_id = auth.uid())
(4 rows)

#6exit 0

ALICE_TOKEN=$(curl -s -X POST "$SUPABASE_URL/auth/v1/token?grant_type=password" -H "apikey: $SUPABASE_ANON_KEY" -H "Content-Type: application/json" -d '{"email":"alice@cari.dev","password":"Passw0rd-alice-42"}' | jq -r .access_token)
BOB_TOKEN=$(curl -s -X POST "$SUPABASE_URL/auth/v1/token?grant_type=password" -H "apikey: $SUPABASE_ANON_KEY" -H "Content-Type: application/json" -d '{"email":"bob@cari.dev","password":"Passw0rd-bob-58"}' | jq -r .access_token)
echo "ALICE_TOKEN=$ALICE_TOKEN" > /tmp/tokens.env
echo "BOB_TOKEN=$BOB_TOKEN" >> /tmp/tokens.env
[ "${ALICE_TOKEN:0:10}" != "null" ] && [ -n "$ALICE_TOKEN" ] && echo "alice login OK" || echo "alice login FAILED"
[ "${BOB_TOKEN:0:10}" != "null" ] && [ -n "$BOB_TOKEN" ] && echo "bob login OK" || echo "bob login FAILED"

alice login OK
bob login OK

#7exit 0

echo "--- ANON select all ---"
curl -s "$SUPABASE_URL/rest/v1/notes?select=*" -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $SUPABASE_ANON_KEY"
echo
echo "--- ANON insert attempt ---"
curl -s -X POST "$SUPABASE_URL/rest/v1/notes" -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $SUPABASE_ANON_KEY" -H "Content-Type: application/json" -d '{"user_id":"12ba8851-9de4-413e-8418-2b5fb8d23607","title":"anon hack"}'
echo
echo "--- ANON delete attempt ---"
curl -s -o /dev/null -w "%{http_code}\n" -X DELETE "$SUPABASE_URL/rest/v1/notes?id=eq.1" -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $SUPABASE_ANON_KEY"

--- ANON select all ---
[]
--- ANON insert attempt ---
{"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}
--- ANON delete attempt ---
204

#8exit 0

source /tmp/tokens.env
AH="Authorization: Bearer $ALICE_TOKEN"
AK="apikey: $SUPABASE_ANON_KEY"
echo "=== 1. Alice reads her notes (expect only user_id 12ba...) ==="
curl -s "$SUPABASE_URL/rest/v1/notes?select=id,title,user_id" -H "$AK" -H "$AH"
echo
echo "=== 2. Alice tries to read Bob's note id=3 (expect []) ==="
curl -s "$SUPABASE_URL/rest/v1/notes?select=*&id=eq.3" -H "$AK" -H "$AH"
echo
echo "=== 3. Alice inserts her own note (expect 201) ==="
curl -s -o /dev/null -w "%{http_code}\n" -X POST "$SUPABASE_URL/rest/v1/notes" -H "$AK" -H "$AH" -H "Content-Type: application/json" -H "Prefer: return=representation" -d '{"user_id":"12ba8851-9de4-413e-8418-2b5fb8d23607","title":"Alice temp note","body":"to be deleted"}'
echo "=== 4. Alice inserts note with BOB's user_id (expect 42501 RLS error) ==="
curl -s -X POST "$SUPABASE_URL/rest/v1/notes" -H "$AK" -H "$AH" -H "Content-Type: application/json" -d '{"user_id":"a395f8d9-a57f-41ff-a4c9-c90a1062eb56","title":"spoofed","body":"as bob"}'
echo
echo "=== 5. Alice updates her own note title (expect 200 with row) ==="
curl -s -X PATCH "$SUPABASE_URL/rest/v1/notes?id=eq.1" -H "$AK" -H "$AH" -H "Content-Type: application/json" -H "Prefer: return=representation" -d '{"title":"Groceries"}'
echo
echo "=== 6. Alice tries to update Bob's note id=3 (expect 200 with empty array - no row matched) ==="
curl -s -X PATCH "$SUPABASE_URL/rest/v1/notes?id=eq.3" -H "$AK" -H "$AH" -H "Content-Type: application/json" -H "Prefer: return=representation" -d '{"title":"HACKED"}'
echo
echo "=== 7. Alice tries to move her note ownership to Bob (expect 200 with empty array due to WITH CHECK, actually error) ==="
curl -s -X PATCH "$SUPABASE_URL/rest/v1/notes?id=eq.1" -H "$AK" -H "$AH" -H "Content-Type: application/json" -H "Prefer: return=representation" -d '{"user_id":"a395f8d9-a57f-41ff-a4c9-c90a1062eb56"}'
echo

=== 1. Alice reads her notes (expect only user_id 12ba...) ===
[{"id":1,"title":"Groceries","user_id":"12ba8851-9de4-413e-8418-2b5fb8d23607"}, 
 {"id":2,"title":"Call plumber","user_id":"12ba8851-9de4-413e-8418-2b5fb8d23607"}]
=== 2. Alice tries to read Bob's note id=3 (expect []) ===
[]
=== 3. Alice inserts her own note (expect 201) ===
201
=== 4. Alice inserts note with BOB's user_id (expect 42501 RLS error) ===
{"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}
=== 5. Alice updates her own note title (expect 200 with row) ===
[{"id":1,"user_id":"12ba8851-9de4-413e-8418-2b5fb8d23607","title":"Groceries","body":"milk, eggs, coffee"}]
=== 6. Alice tries to update Bob's note id=3 (expect 200 with empty array - no row matched) ===
[]
=== 7. Alice tries to move her note ownership to Bob (expect 200 with empty array due to WITH CHECK, actually error) ===
{"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}

#9exit 0

source /tmp/tokens.env
AK="apikey: $SUPABASE_ANON_KEY"
echo "=== Bob reads his notes (expect only user_id a395...) ==="
curl -s "$SUPABASE_URL/rest/v1/notes?select=id,title,user_id" -H "$AK" -H "Authorization: Bearer $BOB_TOKEN"
echo
echo "=== Bob tries to read Alice's note id=1 (expect []) ==="
curl -s "$SUPABASE_URL/rest/v1/notes?select=*&id=eq.1" -H "$AK" -H "Authorization: Bearer $BOB_TOKEN"
echo
echo "=== Alice deletes her temp test note (tests DELETE policy) ==="
curl -s -X DELETE "$SUPABASE_URL/rest/v1/notes?title=eq.Alice%20temp%20note" -H "$AK" -H "Authorization: Bearer $ALICE_TOKEN" -H "Prefer: return=representation"
echo
echo "=== Alice tries to delete Bob's note id=3 (expect empty) ==="
curl -s -X DELETE "$SUPABASE_URL/rest/v1/notes?id=eq.3" -H "$AK" -H "Authorization: Bearer $ALICE_TOKEN" -H "Prefer: return=representation"
echo
echo "=== Final data state (via service role, read-only check) ==="
curl -s "$SUPABASE_URL/rest/v1/notes?select=id,title,body,user_id&order=id" -H "apikey: $SUPABASE_SERVICE_ROLE_KEY" -H "Authorization: Bearer $SUPABASE_SERVICE_ROLE_KEY"

=== Bob reads his notes (expect only user_id a395...) ===
[{"id":3,"title":"Gym plan","user_id":"a395f8d9-a57f-41ff-a4c9-c90a1062eb56"}, 
 {"id":4,"title":"Trip ideas","user_id":"a395f8d9-a57f-41ff-a4c9-c90a1062eb56"}]
=== Bob tries to read Alice's note id=1 (expect []) ===
[]
=== Alice deletes her temp test note (tests DELETE policy) ===
[{"id":6,"user_id":"12ba8851-9de4-413e-8418-2b5fb8d23607","title":"Alice temp note","body":"to be deleted"}]
=== Alice tries to delete Bob's note id=3 (expect empty) ===
[]
=== Final data state (via service role, read-only check) ===
[{"id":1,"title":"Groceries","body":"milk, eggs, coffee","user_id":"12ba8851-9de4-413e-8418-2b5fb8d23607"}, 
 {"id":2,"title":"Call plumber","body":"kitchen sink leaks","user_id":"12ba8851-9de4-413e-8418-2b5fb8d23607"}, 
 {"id":3,"title":"Gym plan","body":"push pull legs","user_id":"a395f8d9-a57f-41ff-a4c9-c90a1062eb56"}, 
 {"id":4,"title":"Trip ideas","body":"mountains in october","user_id":"a395f8d9-a57f-41ff-a4c9-c90a1062eb56"}]

What it said at the end

All requirements verified. The task is complete. ## Summary The `public.notes` table had **no RLS enabled and zero policies**, so the default permissive grants exposed all rows to everyone. I locked it down: **Changes applied (via SQL on the project's Postgres):** ```sql ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY; CREATE POLICY "notes_select_own" ON public.notes FOR SELECT TO authenticated USING (user_id = auth.uid()); CREATE POLICY "notes_insert_own" ON public.notes FOR INSERT TO authenticated WITH CHECK (user_id = auth.uid()); CREATE POLICY "notes_update_own" ON public.notes FOR UPDATE TO authenticated USING (user_id = auth.uid()) WITH CHECK (user_id = auth.uid()); CREATE POLICY "notes_delete_own" ON public.notes FOR DELETE TO authenticated USING (user_id = auth.uid()); ``` `auth.uid()` reads the JWT's `sub`, so it's `NULL` for anon requests — anon matches nothing and needs no separate policy. No `FORCE ROW LEVEL SECURITY`, so the table owner / `service_role` admin path is untouched. **Verified end-to-end through the REST API:** - ✅ Anonymous (anon key): `SELECT` → `[]`, `INSERT` → `42501` RLS violation - ✅ Alice (authenticated) sees only her 2 notes; Bob sees only his 2 — cross-reads return `[]` - ✅ Alice can insert with her own `user_id` (201), but inserting/updating a row with **Bob's** `user_id` is rejected with `42501` - ✅ Owner update/delete work; cross-user update/delete silently affect 0 rows - ✅ Owners' existing access path (`POST /auth/v1/token` → `GET/PATCH/... /rest/v1/notes` with Bearer JWT) fully functional **Data integrity:** the temp note used to test INSERT was deleted via Alice's own session; a final service-role read-only check confirms all 4 original notes are intact and unmodified.

1 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