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

minimax/minimax-m3 · d1_rls_owner · rep 3

pass
model
minimax/minimax-m3
task
d1_rls_owner
rep
3
day
1
steps
16
tokens
50,056
est. cost
$0.035
agent time
84s
wave
s4c
started
2026-07-26T02:25:26Z

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 — 16 commands

#1exit 0
set | grep -iE 'supabase' | sed 's/=.*/=***/'
BASH_EXECUTION_STRING=***
SUPABASE_ANON_KEY=***
SUPABASE_DB_PASSWORD=***
SUPABASE_DB_URL=***
SUPABASE_PROJECT_REF=***
SUPABASE_SERVICE_ROLE_KEY=***
SUPABASE_URL=***
#2exit 0
which psql && psql --version || echo "psql not installed"
/usr/bin/psql
psql (PostgreSQL) 18.4 (Debian 18.4-1.pgdg12+1)
#3exit 0
which curl && curl --version | head -1
/usr/bin/curl
curl 7.88.1 (x86_64-pc-linux-gnu) libcurl/7.88.1 OpenSSL/3.0.20 zlib/1.2.13 brotli/1.0.9 zstd/1.5.4 libidn2/2.3.3 libpsl/0.21.2 (+libidn2/2.3.3) libssh2/1.10.0 nghttp2/1.52.0 librtmp/2.3 OpenLDAP/2.5.13
#4exit 0
echo "$SUPABASE_DB_URL"
<redacted:SUPABASE_DB_URL>
#5exit 0
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -c "\d public.notes"
                            Table "public.notes"
 Column  |  Type  | Collation | Nullable |             Default              
---------+--------+-----------+----------+----------------------------------
 id      | bigint |           | not null | generated by default as identity
 user_id | uuid   |           | not null | 
 title   | text   |           | not null | 
 body    | text   |           | not null | ''::text
Indexes:
    "notes_pkey" PRIMARY KEY, btree (id)
Foreign-key constraints:
    "notes_user_id_fkey" FOREIGN KEY (user_id) REFERENCES auth.users(id) ON DELETE CASCADE
#6exit 0
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -c "SELECT id, user_id, title FROM public.notes ORDER BY user_id, id;"
 id |               user_id                |    title     
----+--------------------------------------+--------------
  1 | 409b5bc3-8d23-4780-98a7-d4d4ac3a4a41 | Groceries
  2 | 409b5bc3-8d23-4780-98a7-d4d4ac3a4a41 | Call plumber
  3 | 824eb955-2409-45d3-b3dc-06f2caa22266 | Gym plan
  4 | 824eb955-2409-45d3-b3dc-06f2caa22266 | Trip ideas
(4 rows)
#7exit 0
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -c "SELECT schemaname, tablename, policyname, cmd, qual, with_check FROM pg_policies WHERE schemaname='public' AND tablename='notes';"
 schemaname | tablename | policyname | cmd | qual | with_check 
------------+-----------+------------+-----+------+------------
(0 rows)
#8exit 0
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -c "SELECT relname, relrowsecurity, relforcerowsecurity FROM pg_class WHERE relname='notes';"
 relname | relrowsecurity | relforcerowsecurity 
---------+----------------+---------------------
 notes   | f              | f
(1 row)
#9exit 0
echo "=== anon SELECT all rows ==="
curl -sS "$SUPABASE_URL/rest/v1/notes?select=id,user_id,title" -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $SUPABASE_ANON_KEY"
echo
echo "=== anon COUNT ==="
curl -sS "$SUPABASE_URL/rest/v1/notes?select=id" -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $SUPABASE_ANON_KEY" -H "Prefer: count=exact" -H "Range-Unit: items" -H "Range: 0-0" -i | grep -iE 'content-range|^HTTP'
=== anon SELECT all rows ===
[{"id":1,"user_id":"409b5bc3-8d23-4780-98a7-d4d4ac3a4a41","title":"Groceries"}, 
 {"id":2,"user_id":"409b5bc3-8d23-4780-98a7-d4d4ac3a4a41","title":"Call plumber"}, 
 {"id":3,"user_id":"824eb955-2409-45d3-b3dc-06f2caa22266","title":"Gym plan"}, 
 {"id":4,"user_id":"824eb955-2409-45d3-b3dc-06f2caa22266","title":"Trip ideas"}]
=== anon COUNT ===
HTTP/2 206 
content-range: 0-0/4
#10exit 0
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -v ON_ERROR_STOP=1 <<'SQL'
-- Lock down public.notes to owner-only access via Row Level Security.

-- 1) Enable RLS on the table.
ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY;

-- 2) Force RLS even for the table owner (defense in depth: a SECURITY DEFINER
--    function or a misconfigured owner role still can't bypass policies).
ALTER TABLE public.notes FORCE ROW LEVEL SECURITY;

-- 3) Ensure the baseline privileges are minimal. We still keep GRANTs so that
--    PostgREST role detection works (authenticated role is used for JWT users,
--    anon role for unauthenticated). Policies do the actual filtering.
--    Revoke any broad grants from the public-facing roles; keep only the ones
--    PostgREST needs to expose the table.
REVOKE ALL ON TABLE public.notes FROM PUBLIC;
REVOKE ALL ON TABLE public.notes FROM anon;
REVOKE ALL ON TABLE public.notes FROM authenticated;

-- Re-grant the table-level privileges required by PostgREST for the four CRUD
-- verbs. Without these, even a matching policy would 401/403.
GRANT SELECT, INSERT, UPDATE, DELETE ON TABLE public.notes TO authenticated;
GRANT SELECT, INSERT, UPDATE, DELETE ON TABLE public.notes TO anon;

-- 4) Drop any pre-existing policies on this table (idempotent for re-runs).
DO $$
DECLARE p text;
BEGIN
  FOR p IN SELECT policyname FROM pg_policies
           WHERE schemaname = 'public' AND tablename = 'notes'
  LOOP
    EXECUTE format('DROP POLICY %I ON public.notes', p);
  END LOOP;
END $$;

-- 5) Owner-only policies. auth.uid() returns the UUID of the currently
--    authenticated user (NULL for anon), so:
--      SELECT/UPDATE/DELETE: rows visible only when user_id = auth.uid()
--      INSERT: with_check enforces the same, blocking inserts that try to set
--              someone else's user_id (and rejecting inserts when there is no
--              authenticated user at all).
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());

-- 6) Belt-and-braces: make sure the table is in the PostgREST-exposed schemas
--    (Supabase already exposes public by default, so this is just an explicit
--    confirm).
--    (Nothing to do — public is in supabase.expose_schemas by default.)

-- 7) Quick sanity dump.
SELECT relname, relrowsecurity, relforcerowsecurity FROM pg_class WHERE relname='notes';
SELECT schemaname, tablename, policyname, cmd, roles, qual, with_check
FROM pg_policies
WHERE schemaname='public' AND tablename='notes'
ORDER BY policyname;
SELECT grantee, privilege_type
FROM information_schema.role_table_grants
WHERE table_schema='public' AND table_name='notes'
ORDER BY grantee, privilege_type;
SQL
ALTER TABLE
ALTER TABLE
REVOKE
REVOKE
REVOKE
GRANT
GRANT
DO
CREATE POLICY
CREATE POLICY
CREATE POLICY
CREATE POLICY
 relname | relrowsecurity | relforcerowsecurity 
---------+----------------+---------------------
 notes   | t              | t
(1 row)

 schemaname | tablename |    policyname    |  cmd   |      roles      |          qual          |       with_check       
------------+-----------+------------------+--------+-----------------+------------------------+------------------------
 public     | notes     | notes_delete_own | DELETE | {authenticated} | (user_id = auth.uid()) | 
 public     | notes     | notes_insert_own | INSERT | {authenticated} |                        | (user_id = auth.uid())
 public     | notes     | notes_select_own | SELECT | {authenticated} | (user_id = auth.uid()) | 
 public     | notes     | notes_update_own | UPDATE | {authenticated} | (user_id = auth.uid()) | (user_id = auth.uid())
(4 rows)

    grantee    | privilege_type 
---------------+----------------
 anon          | DELETE
 anon          | INSERT
 anon          | SELECT
 anon          | UPDATE
 authenticated | DELETE
 authenticated | INSERT
 authenticated | SELECT
 authenticated | UPDATE
 postgres      | DELETE
 postgres      | INSERT
 postgres      | REFERENCES
 postgres      | SELECT
 postgres      | TRIGGER
 postgres      | TRUNCATE
 postgres      | UPDATE
 service_role  | DELETE
 service_role  | INSERT
 service_role  | REFERENCES
 service_role  | SELECT
 service_role  | TRIGGER
 service_role  | TRUNCATE
 service_role  | UPDATE
(22 rows)
#11exit 0
cat > /tmp/login_alice.sh <<'EOF'
curl -sS "$SUPABASE_URL/auth/v1/token?grant_type=password" \
  -H "apikey: $SUPABASE_ANON_KEY" \
  -H "Content-Type: application/json" \
  -d '{"email":"alice@cari.dev","password":"Passw0rd-alice-42"}'
EOF
cat > /tmp/login_bob.sh <<'EOF'
curl -sS "$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"}'
EOF

ALICE=$(bash /tmp/login_alice.sh)
echo "ALICE login response (truncated):"
echo "$ALICE" | head -c 400; echo
ALICE_TOKEN=$(echo "$ALICE" | python3 -c 'import sys,json; print(json.load(sys.stdin)["access_token"])')
ALICE_UID=$(echo  "$ALICE" | python3 -c 'import sys,json; print(json.load(sys.stdin)["user"]["id"])')

BOB=$(bash /tmp/login_bob.sh)
BOB_TOKEN=$(echo "$BOB"   | python3 -c 'import sys,json; print(json.load(sys.stdin)["access_token"])')
BOB_UID=$(echo   "$BOB"   | python3 -c 'import sys,json; print(json.load(sys.stdin)["user"]["id"])')

echo "ALICE_UID=$ALICE_UID"
echo "BOB_UID=$BOB_UID"

# Save for later steps.
cat >/tmp/tokens.env <<EOT
ALICE_TOKEN=$ALICE_TOKEN
ALICE_UID=$ALICE_UID
BOB_TOKEN=$BOB_TOKEN
BOB_UID=$BOB_UID
EOT
ALICE login response (truncated):
{"access_token":"<jwt:token>
ALICE_UID=409b5bc3-8d23-4780-98a7-d4d4ac3a4a41
BOB_UID=824eb955-2409-45d3-b3dc-06f2caa22266
#12exit 0
. /tmp/tokens.env

count_via_rest() {
  # $1 = label, $2 = apikey, $3 = bearer
  local label="$1" key="$2" bearer="$3"
  local out
  out=$(curl -sS -o /tmp/body.json -w '%{http_code}|%{header_json}' \
    "$SUPABASE_URL/rest/v1/notes?select=id" \
    -H "apikey: $key" -H "Authorization: Bearer $bearer" \
    -H "Prefer: count=exact" -H "Range-Unit: items" -H "Range: 0-0")
  local code="${out%%|*}"
  local cr
  cr=$(curl -sS -D - -o /dev/null \
    "$SUPABASE_URL/rest/v1/notes?select=id" \
    -H "apikey: $key" -H "Authorization: Bearer $bearer" \
    -H "Range-Unit: items" -H "Range: 0-0" \
    | tr -d '\r' | awk 'BEGIN{IGNORECASE=1} /^content-range:/ {print $2}')
  echo "  $label: HTTP=$code  content-range=$cr"
  echo "  body: $(cat /tmp/body.json | head -c 200)"
}

echo "=== 1) ANON (no JWT) must see 0 rows ==="
count_via_rest "anon" "$SUPABASE_ANON_KEY" "$SUPABASE_ANON_KEY"

echo
echo "=== 2) ALICE (authenticated, owner of rows 1,2) ==="
count_via_rest "alice SELECT all" "$SUPABASE_ANON_KEY" "$ALICE_TOKEN"

echo "  -- alice explicit body --"
curl -sS "$SUPABASE_URL/rest/v1/notes?select=id,user_id,title&order=id" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN"
echo

echo
echo "=== 3) BOB (authenticated, owner of rows 3,4) ==="
count_via_rest "bob SELECT all" "$SUPABASE_ANON_KEY" "$BOB_TOKEN"
echo "  -- bob explicit body --"
curl -sS "$SUPABASE_URL/rest/v1/notes?select=id,user_id,title&order=id" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $BOB_TOKEN"
echo
=== 1) ANON (no JWT) must see 0 rows ===
  anon: HTTP=200  content-range=*/*
  body: []

=== 2) ALICE (authenticated, owner of rows 1,2) ===
  alice SELECT all: HTTP=206  content-range=0-0/*
  body: [{"id":1}]
  -- alice explicit body --
[{"id":1,"user_id":"409b5bc3-8d23-4780-98a7-d4d4ac3a4a41","title":"Groceries"}, 
 {"id":2,"user_id":"409b5bc3-8d23-4780-98a7-d4d4ac3a4a41","title":"Call plumber"}]

=== 3) BOB (authenticated, owner of rows 3,4) ===
  bob SELECT all: HTTP=206  content-range=0-0/*
  body: [{"id":3}]
  -- bob explicit body --
[{"id":3,"user_id":"824eb955-2409-45d3-b3dc-06f2caa22266","title":"Gym plan"}, 
 {"id":4,"user_id":"824eb955-2409-45d3-b3dc-06f2caa22266","title":"Trip ideas"}]
#13exit 0
. /tmp/tokens.env

H_JSON='Content-Type: application/json'
H_PREF='Prefer: return=representation'

show() { local label="$1" code="$2" body="$3"; echo "  $label: HTTP=$code  body=$body"; }

echo "=== INSERT as alice with her OWN user_id (should SUCCEED, then we DELETE it) ==="
RESP=$(curl -sS -o /tmp/b -w '%{http_code}' \
  -X POST "$SUPABASE_URL/rest/v1/notes" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H "$H_JSON" -H "$H_PREF" \
  -d "{\"user_id\":\"$ALICE_UID\",\"title\":\"probe alice own\",\"body\":\"x\"}")
show "alice INSERT own" "$RESP" "$(cat /tmp/b)"
ALICE_PROBE_ID=$(python3 -c 'import json,sys; d=json.load(open("/tmp/b")); print(d[0]["id"]) if isinstance(d,list) else print(d.get("id",""))')
echo "  -> alice probe id=$ALICE_PROBE_ID"

echo
echo "=== INSERT as alice with BOB's user_id (should be REJECTED, 0 rows affected) ==="
RESP=$(curl -sS -o /tmp/b -w '%{http_code}' \
  -X POST "$SUPABASE_URL/rest/v1/notes" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H "$H_JSON" -H "$H_PREF" \
  -d "{\"user_id\":\"$BOB_UID\",\"title\":\"probe impersonate bob\",\"body\":\"x\"}")
show "alice INSERT with bob uid" "$RESP" "$(cat /tmp/b)"

echo
echo "=== INSERT as alice with NO user_id (should be REJECTED — auth.uid() != NULL but row user_id will be NULL != auth.uid()) ==="
RESP=$(curl -sS -o /tmp/b -w '%{http_code}' \
  -X POST "$SUPABASE_URL/rest/v1/notes" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H "$H_JSON" -H "$H_PREF" \
  -d '{"title":"probe missing uid","body":"x"}')
show "alice INSERT no uid" "$RESP" "$(cat /tmp/b)"

echo
echo "=== INSERT with anon key (should be REJECTED — no auth.uid(), but INSERT goes through 'anon' role; policy is only for 'authenticated') ==="
RESP=$(curl -sS -o /tmp/b -w '%{http_code}' \
  -X POST "$SUPABASE_URL/rest/v1/notes" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $SUPABASE_ANON_KEY" \
  -H "$H_JSON" \
  -d "{\"user_id\":\"$ALICE_UID\",\"title\":\"probe anon\",\"body\":\"x\"}")
show "anon INSERT" "$RESP" "$(cat /tmp/b)"
=== INSERT as alice with her OWN user_id (should SUCCEED, then we DELETE it) ===
  alice INSERT own: HTTP=201  body=[{"id":5,"user_id":"409b5bc3-8d23-4780-98a7-d4d4ac3a4a41","title":"probe alice own","body":"x"}]
  -> alice probe id=5

=== INSERT as alice with BOB's user_id (should be REJECTED, 0 rows affected) ===
  alice INSERT with bob uid: HTTP=403  body={"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}

=== INSERT as alice with NO user_id (should be REJECTED — auth.uid() != NULL but row user_id will be NULL != auth.uid()) ===
  alice INSERT no uid: HTTP=403  body={"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}

=== INSERT with anon key (should be REJECTED — no auth.uid(), but INSERT goes through 'anon' role; policy is only for 'authenticated') ===
  anon INSERT: HTTP=401  body={"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}
#14exit 0
. /tmp/tokens.env

show() { local label="$1" code="$2" body="$3"; echo "  $label: HTTP=$code  body=$body"; }

echo "=== UPDATE alice's own row (id=1) — should SUCCEED ==="
RESP=$(curl -sS -o /tmp/b -w '%{http_code}' \
  -X PATCH "$SUPABASE_URL/rest/v1/notes?id=eq.1" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H 'Content-Type: application/json' -H 'Prefer: return=representation' \
  -d '{"title":"Groceries (edited)"}')
show "alice UPDATE own id=1" "$RESP" "$(cat /tmp/b)"

echo
echo "=== UPDATE bob's row (id=3) as alice — should affect 0 rows (with_return=representation returns []) ==="
RESP=$(curl -sS -o /tmp/b -w '%{http_code}' \
  -X PATCH "$SUPABASE_URL/rest/v1/notes?id=eq.3" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H 'Content-Type: application/json' -H 'Prefer: return=representation' \
  -d '{"title":"pwned by alice"}')
show "alice UPDATE bob id=3" "$RESP" "$(cat /tmp/b)"

echo
echo "=== DELETE bob's row (id=3) as alice — should affect 0 rows ==="
RESP=$(curl -sS -o /tmp/b -w '%{http_code}' \
  -X DELETE "$SUPABASE_URL/rest/v1/notes?id=eq.3" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H 'Prefer: return=representation')
show "alice DELETE bob id=3" "$RESP" "$(cat /tmp/b)"

echo
echo "=== DELETE alice's own probe row (id=5) — should SUCCEED ==="
RESP=$(curl -sS -o /tmp/b -w '%{http_code}' \
  -X DELETE "$SUPABASE_URL/rest/v1/notes?id=eq.5" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H 'Prefer: return=representation')
show "alice DELETE own id=5" "$RESP" "$(cat /tmp/b)"

echo
echo "=== Try to swap owner: UPDATE alice's row (id=2) and set user_id=bob — must FAIL via WITH CHECK ==="
RESP=$(curl -sS -o /tmp/b -w '%{http_code}' \
  -X PATCH "$SUPABASE_URL/rest/v1/notes?id=eq.2" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H 'Content-Type: application/json' -H 'Prefer: return=representation' \
  -d "{\"user_id\":\"$BOB_UID\"}")
show "alice UPDATE setting user_id=bob" "$RESP" "$(cat /tmp/b)"

echo
echo "=== Restore title on id=1 ==="
RESP=$(curl -sS -o /tmp/b -w '%{http_code}' \
  -X PATCH "$SUPABASE_URL/rest/v1/notes?id=eq.1" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H 'Content-Type: application/json' -H 'Prefer: return=representation' \
  -d '{"title":"Groceries"}')
show "alice RESTORE id=1 title" "$RESP" "$(cat /tmp/b)"
=== UPDATE alice's own row (id=1) — should SUCCEED ===
  alice UPDATE own id=1: HTTP=200  body=[{"id":1,"user_id":"409b5bc3-8d23-4780-98a7-d4d4ac3a4a41","title":"Groceries (edited)","body":"milk, eggs, coffee"}]

=== UPDATE bob's row (id=3) as alice — should affect 0 rows (with_return=representation returns []) ===
  alice UPDATE bob id=3: HTTP=200  body=[]

=== DELETE bob's row (id=3) as alice — should affect 0 rows ===
  alice DELETE bob id=3: HTTP=200  body=[]

=== DELETE alice's own probe row (id=5) — should SUCCEED ===
  alice DELETE own id=5: HTTP=200  body=[{"id":5,"user_id":"409b5bc3-8d23-4780-98a7-d4d4ac3a4a41","title":"probe alice own","body":"x"}]

=== Try to swap owner: UPDATE alice's row (id=2) and set user_id=bob — must FAIL via WITH CHECK ===
  alice UPDATE setting user_id=bob: HTTP=403  body={"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}

=== Restore title on id=1 ===
  alice RESTORE id=1 title: HTTP=200  body=[{"id":1,"user_id":"409b5bc3-8d23-4780-98a7-d4d4ac3a4a41","title":"Groceries","body":"milk, eggs, coffee"}]
#15exit 0
export PGPASSWORD="$SUPABASE_DB_PASSWORD"
psql "$SUPABASE_DB_URL" -c "SELECT id, user_id, title, body FROM public.notes ORDER BY id;"
 id |               user_id                |    title     |         body         
----+--------------------------------------+--------------+----------------------
  1 | 409b5bc3-8d23-4780-98a7-d4d4ac3a4a41 | Groceries    | milk, eggs, coffee
  2 | 409b5bc3-8d23-4780-98a7-d4d4ac3a4a41 | Call plumber | kitchen sink leaks
  3 | 824eb955-2409-45d3-b3dc-06f2caa22266 | Gym plan     | push pull legs
  4 | 824eb955-2409-45d3-b3dc-06f2caa22266 | Trip ideas   | mountains in october
(4 rows)
#16exit 0
. /tmp/tokens.env
echo "=== final REST checks via service_role (admin) — full set visible ==="
curl -sS "$SUPABASE_URL/rest/v1/notes?select=id,user_id,title&order=id" \
  -H "apikey: $SUPABASE_SERVICE_ROLE_KEY" -H "Authorization: Bearer $SUPABASE_SERVICE_ROLE_KEY"
echo
echo "=== alice final view via REST (PostgREST) ==="
curl -sS "$SUPABASE_URL/rest/v1/notes?select=id,user_id,title&order=id" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN"
echo
echo "=== bob final view via REST ==="
curl -sS "$SUPABASE_URL/rest/v1/notes?select=id,user_id,title&order=id" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $BOB_TOKEN"
echo
echo "=== anon final view via REST ==="
curl -sS "$SUPABASE_URL/rest/v1/notes?select=id,user_id,title&order=id" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $SUPABASE_ANON_KEY"
echo
=== final REST checks via service_role (admin) — full set visible ===
[{"id":1,"user_id":"409b5bc3-8d23-4780-98a7-d4d4ac3a4a41","title":"Groceries"}, 
 {"id":2,"user_id":"409b5bc3-8d23-4780-98a7-d4d4ac3a4a41","title":"Call plumber"}, 
 {"id":3,"user_id":"824eb955-2409-45d3-b3dc-06f2caa22266","title":"Gym plan"}, 
 {"id":4,"user_id":"824eb955-2409-45d3-b3dc-06f2caa22266","title":"Trip ideas"}]
=== alice final view via REST (PostgREST) ===
[{"id":1,"user_id":"409b5bc3-8d23-4780-98a7-d4d4ac3a4a41","title":"Groceries"}, 
 {"id":2,"user_id":"409b5bc3-8d23-4780-98a7-d4d4ac3a4a41","title":"Call plumber"}]
=== bob final view via REST ===
[{"id":3,"user_id":"824eb955-2409-45d3-b3dc-06f2caa22266","title":"Gym plan"}, 
 {"id":4,"user_id":"824eb955-2409-45d3-b3dc-06f2caa22266","title":"Trip ideas"}]
=== anon final view via REST ===
[]

What it said at the end

Everything works as required and data is intact. ## Summary **Root cause:** `public.notes` had no RLS enabled and no policies, so PostgREST's default `anon`/`authenticated` table-level `GRANT`s allowed anyone to read every row. **Fix applied (via the Supabase DB using `SUPABASE_DB_URL`):** 1. **Enabled and forced RLS** on `public.notes`: - `ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY;` - `ALTER TABLE public.notes FORCE ROW LEVEL SECURITY;` (so even the table owner can't bypass policies) 2. **Tightened table-level grants** — revoked broad `PUBLIC`/`anon`/`authenticated` privileges and re-granted only the CRUD verbs PostgREST needs (`SELECT/INSERT/UPDATE/DELETE` to both `anon` and `authenticated`). The actual row filtering is now entirely policy-driven. 3. **Created four owner-only policies** keyed on `auth.uid()` (which returns the JWT's `sub`, i.e. `auth.users.id`, and is `NULL` for anon): - `notes_select_own` — `FOR SELECT TO authenticated USING (user_id = auth.uid())` - `notes_insert_own` — `FOR INSERT TO authenticated WITH CHECK (user_id = auth.uid())` - `notes_update_own` — `FOR UPDATE TO authenticated USING (user_id = auth.uid()) WITH CHECK (user_id = auth.uid())` (the `WITH CHECK` blocks owner-swap attempts) - `notes_delete_own` — `FOR DELETE TO authenticated USING (user_id = auth.uid())` 4. **No policy targets `anon`**, so anonymous calls hit no policy and get zero rows. **End-to-end verification through the REST API:** | Scenario | Expected | Result | |---|---|---| | anon `GET /notes` | 0 rows | `[]` (content-range `*/*`) ✅ | | alice `GET /notes` | rows 1,2 only | `[1, 2]` ✅ | | bob `GET /notes` | rows 3,4 only | `[3, 4]` ✅ | | alice `INSERT` with own `user_id` | 201 | 201, row created ✅ | | alice `INSERT` with bob's `user_id` | 403 | 403 `42501` new row violates RLS ✅ | | alice `INSERT` with no `user_id` | 403 | 403 ✅ | | anon `INSERT` | 401/403 | rejected ✅ | | alice `UPDATE` own row 1 | 200 | 200 ✅ | | alice `UPDATE` bob's row 3 | 0 rows | `[]` (HTTP 200, 0 rows) ✅ | | alice `DELETE` bob's row 3 | 0 rows | `[]` ✅ | | alice `UPDATE` own row 2 setting `user_id=bob` | 403 | 403 RLS violation (owner-swap blocked) ✅ | | alice `DELETE` own probe row | 200 | 200 ✅ | | service_role `GET /notes` | all 4 rows | all 4 rows (admin path preserved) ✅ | **Data:** Original 4 notes are intact, unmodified (`id 1..4`, original titles/bodies, original `user_id` values). Alice's probe insert (id 5) was deleted at the end of testing. The legitimate owner-only access path through the REST API is preserved: the same `https://…/rest/v1/notes` endpoint works for each user with their JWT and now only returns their own rows.

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