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

claude-sonnet-5 · d1_rls_owner · rep 1

fail
model
claude-sonnet-5
task
d1_rls_owner
rep
1
day
1
steps
11
tokens
92,975
est. cost
$0.558
agent time
76s
wave
s4
started
2026-07-24T04:26:38Z

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 | sed 's/=.*KEY.*/=***REDACTED***/'
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 curl jq 2>&1; psql --version 2>&1
/usr/bin/psql
/usr/bin/curl
/usr/bin/jq
psql (PostgreSQL) 18.4 (Debian 18.4-1.pgdg12+1)
#3exit 0
psql "$SUPABASE_DB_URL" -c "\d public.notes"
echo "---"
psql "$SUPABASE_DB_URL" -c "SELECT relname, relrowsecurity, relforcerowsecurity FROM pg_class WHERE relname='notes';"
echo "---"
psql "$SUPABASE_DB_URL" -c "SELECT * FROM pg_policies WHERE tablename='notes';"
echo "---"
psql "$SUPABASE_DB_URL" -c "SELECT grantee, table_name, privilege_type FROM information_schema.role_table_grants WHERE table_name='notes';"
echo "---"
psql "$SUPABASE_DB_URL" -c "SELECT id, user_id, title FROM public.notes ORDER BY user_id;"

                            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

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

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

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

---
 id |               user_id                |    title     
----+--------------------------------------+--------------
  3 | 0d2b1cef-2c25-4c64-ac8b-37088be1063c | Gym plan
  4 | 0d2b1cef-2c25-4c64-ac8b-37088be1063c | Trip ideas
  1 | a952f866-0095-4ab1-8d6e-d2dba6f11616 | Groceries
  2 | a952f866-0095-4ab1-8d6e-d2dba6f11616 | Call plumber
(4 rows)
#4exit 0
cat > /tmp/lockdown.sql << 'EOF'
BEGIN;

-- Enable and force RLS on notes
ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY;
ALTER TABLE public.notes FORCE ROW LEVEL SECURITY;

-- Drop any pre-existing policies with these names (idempotency)
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;

-- SELECT: only own rows
CREATE POLICY notes_select_own ON public.notes
  FOR SELECT
  TO authenticated
  USING (auth.uid() = user_id);

-- INSERT: only allowed to insert rows where user_id = own uid
CREATE POLICY notes_insert_own ON public.notes
  FOR INSERT
  TO authenticated
  WITH CHECK (auth.uid() = user_id);

-- UPDATE: can only update own rows, and cannot change user_id to someone else's
CREATE POLICY notes_update_own ON public.notes
  FOR UPDATE
  TO authenticated
  USING (auth.uid() = user_id)
  WITH CHECK (auth.uid() = user_id);

-- DELETE: only own rows
CREATE POLICY notes_delete_own ON public.notes
  FOR DELETE
  TO authenticated
  USING (auth.uid() = user_id);

-- Tighten grants: remove anon access entirely, keep authenticated CRUD (RLS still restricts rows)
REVOKE ALL ON public.notes FROM anon;
REVOKE ALL ON public.notes FROM authenticated;
GRANT SELECT, INSERT, UPDATE, DELETE ON public.notes TO authenticated;

-- Sequence grant for identity column inserts (authenticated needs usage if not using default identity via serial)
-- notes.id is "generated by default as identity" so inserts don't require sequence privileges typically owned by table owner,
-- but grant just in case a sequence exists and is needed.
DO $$
DECLARE
  seqname text;
BEGIN
  SELECT pg_get_serial_sequence('public.notes', 'id') INTO seqname;
  IF seqname IS NOT NULL THEN
    EXECUTE format('GRANT USAGE, SELECT ON SEQUENCE %s TO authenticated', seqname);
  END IF;
END $$;

COMMIT;
EOF
psql "$SUPABASE_DB_URL" -f /tmp/lockdown.sql
BEGIN
ALTER TABLE
ALTER TABLE
DROP POLICY
DROP POLICY
DROP POLICY
DROP POLICY
CREATE POLICY
CREATE POLICY
CREATE POLICY
CREATE POLICY
REVOKE
REVOKE
GRANT
DO
COMMIT

psql:/tmp/lockdown.sql:8: NOTICE:  policy "notes_select_own" for relation "public.notes" does not exist, skipping
psql:/tmp/lockdown.sql:9: NOTICE:  policy "notes_insert_own" for relation "public.notes" does not exist, skipping
psql:/tmp/lockdown.sql:10: NOTICE:  policy "notes_update_own" for relation "public.notes" does not exist, skipping
psql:/tmp/lockdown.sql:11: NOTICE:  policy "notes_delete_own" for relation "public.notes" does not exist, skipping
#5exit 0
psql "$SUPABASE_DB_URL" -c "SELECT relname, relrowsecurity, relforcerowsecurity FROM pg_class WHERE relname='notes';"
echo "---policies---"
psql "$SUPABASE_DB_URL" -c "SELECT policyname, cmd, roles, qual, with_check FROM pg_policies WHERE tablename='notes';"
echo "---grants---"
psql "$SUPABASE_DB_URL" -c "SELECT grantee, privilege_type FROM information_schema.role_table_grants WHERE table_name='notes' ORDER BY grantee, privilege_type;"

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

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

---grants---
    grantee    | privilege_type 
---------------+----------------
 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
(18 rows)
#6exit 0
set -e
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 len: ${#ALICE_TOKEN}"
echo "BOB_TOKEN len: ${#BOB_TOKEN}"

ALICE_UID=$(echo "$ALICE_TOKEN" | cut -d. -f2 | base64 -d 2>/dev/null | jq -r .sub)
BOB_UID=$(echo "$BOB_TOKEN" | cut -d. -f2 | base64 -d 2>/dev/null | jq -r .sub)
echo "alice uid=$ALICE_UID  bob uid=$BOB_UID"

echo "$ALICE_TOKEN" > /tmp/alice.tok
echo "$BOB_TOKEN" > /tmp/bob.tok
echo "$ALICE_UID" > /tmp/alice.uid
echo "$BOB_UID" > /tmp/bob.uid

ALICE_TOKEN len: 791
BOB_TOKEN len: 788
alice uid=a952f866-0095-4ab1-8d6e-d2dba6f11616  bob uid=0d2b1cef-2c25-4c64-ac8b-37088be1063c
#7exit 0
ALICE_TOKEN=$(cat /tmp/alice.tok); BOB_TOKEN=$(cat /tmp/bob.tok)
ALICE_UID=$(cat /tmp/alice.uid); BOB_UID=$(cat /tmp/bob.uid)

echo "=== 1. Anonymous SELECT (should return empty array) ==="
curl -s "$SUPABASE_URL/rest/v1/notes?select=*" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $SUPABASE_ANON_KEY"
echo

echo "=== 2. Alice SELECT (should see only her 2 notes) ==="
curl -s "$SUPABASE_URL/rest/v1/notes?select=*" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN"
echo

echo "=== 3. Bob SELECT (should see only his 2 notes) ==="
curl -s "$SUPABASE_URL/rest/v1/notes?select=*" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $BOB_TOKEN"
echo

echo "=== 4. Alice tries to insert a note with Bob's user_id (should fail / insert 0 rows) ==="
curl -s -i -X POST "$SUPABASE_URL/rest/v1/notes" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H "Content-Type: application/json" -H "Prefer: return=representation" \
  -d "{\"user_id\":\"$BOB_UID\",\"title\":\"Malicious\",\"body\":\"hack\"}"
echo

echo "=== 5. Alice inserts a note with her own user_id (should succeed) ==="
curl -s -i -X POST "$SUPABASE_URL/rest/v1/notes" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H "Content-Type: application/json" -H "Prefer: return=representation" \
  -d "{\"user_id\":\"$ALICE_UID\",\"title\":\"Test insert\",\"body\":\"testing\"}"
echo

=== 1. Anonymous SELECT (should return empty array) ===
{"code":"42501","details":null,"hint":"Grant the required privileges to the current role with: GRANT SELECT ON public.notes TO anon;","message":"permission denied for table notes"}
=== 2. Alice SELECT (should see only her 2 notes) ===
[{"id":1,"user_id":"a952f866-0095-4ab1-8d6e-d2dba6f11616","title":"Groceries","body":"milk, eggs, coffee"}, 
 {"id":2,"user_id":"a952f866-0095-4ab1-8d6e-d2dba6f11616","title":"Call plumber","body":"kitchen sink leaks"}]
=== 3. Bob SELECT (should see only his 2 notes) ===
[{"id":3,"user_id":"0d2b1cef-2c25-4c64-ac8b-37088be1063c","title":"Gym plan","body":"push pull legs"}, 
 {"id":4,"user_id":"0d2b1cef-2c25-4c64-ac8b-37088be1063c","title":"Trip ideas","body":"mountains in october"}]
=== 4. Alice tries to insert a note with Bob's user_id (should fail / insert 0 rows) ===
HTTP/2 403 
date: Fri, 24 Jul 2026 04:27:33 GMT
content-type: application/json; charset=utf-8
cf-ray: a2002c4fa99b3650-FRA
cf-cache-status: DYNAMIC
set-cookie: __cf_bm=0vOVbKctFnBzu1AtBoSZNoqKZkl6w9hMX0nCiJ5spvg-1784867253.7059355-1.0.1.1-eRZ6c2eyNfL12_B9PjdyA2PlTYj4pQ606WdtJLOwnhA4.Fj1n4LuxkE8E6zjCqtBsa3HHWbNA5E501VrOxU23kZPfCKnHmfiR_pSSZBvK4DeloeQj6_YvChuthbUCFI5; HttpOnly; SameSite=None; Secure; Path=/; Domain=supabase.co; Expires=Fri, 24 Jul 2026 04:57:33 GMT
server: cloudflare
strict-transport-security: max-age=31536000; includeSubDomains; preload
vary: Accept-Encoding
proxy-status: PostgREST; error=42501
x-content-type-options: nosniff
sb-gateway-version: 1
sb-project-ref: <ref>
sb-request-id: 019f9260-edcf-7f6b-ba03-a4b1bb075178
x-envoy-attempt-count: 1
x-envoy-upstream-service-time: 3
alt-svc: h3=":443"; ma=86400

{"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}
=== 5. Alice inserts a note with her own user_id (should succeed) ===
HTTP/2 201 
date: Fri, 24 Jul 2026 04:27:33 GMT
content-type: application/json; charset=utf-8
content-length: 98
content-range: */*
cf-ray: a2002c50ac511e45-FRA
cf-cache-status: DYNAMIC
server: cloudflare
strict-transport-security: max-age=31536000; includeSubDomains; preload
x-content-type-options: nosniff
content-profile: public
preference-applied: return=representation
sb-gateway-version: 1
sb-project-ref: <ref>
sb-request-id: 019f9260-ee71-7386-a472-8c40cca351df
x-envoy-attempt-count: 1
x-envoy-upstream-service-time: 4
set-cookie: __cf_bm=hu2haYTUYtJTJriNlem58LPGmn1mG3vT4mCZhaTdH7w-1784867253.8680847-1.0.1.1-cqc3h8C1vsBa_gl06_JJ9E_I1R8e2EGwpVPhoycIN95iM4PuXvZTqNTz7JPEcYQbASKRH0sBYdfZRRLr8rKCAKwV.SQgJBabubw5iCAxJF_79yUbKuMn1h2MJkQw9GB1; HttpOnly; SameSite=None; Secure; Path=/; Domain=supabase.co; Expires=Fri, 24 Jul 2026 04:57:33 GMT
alt-svc: h3=":443"; ma=86400

[{"id":6,"user_id":"a952f866-0095-4ab1-8d6e-d2dba6f11616","title":"Test insert","body":"testing"}]
#8exit 0
ALICE_TOKEN=$(cat /tmp/alice.tok); BOB_TOKEN=$(cat /tmp/bob.tok)
ALICE_UID=$(cat /tmp/alice.uid); BOB_UID=$(cat /tmp/bob.uid)

echo "=== 6. Bob tries to update Alice's note (id=6) -> should affect 0 rows ==="
curl -s -i -X PATCH "$SUPABASE_URL/rest/v1/notes?id=eq.6" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $BOB_TOKEN" \
  -H "Content-Type: application/json" -H "Prefer: return=representation" \
  -d '{"title":"Hacked by bob"}'
echo

echo "=== 7. Bob tries to delete Alice's note (id=6) -> should affect 0 rows ==="
curl -s -i -X DELETE "$SUPABASE_URL/rest/v1/notes?id=eq.6" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $BOB_TOKEN" \
  -H "Prefer: return=representation"
echo

echo "=== 8. Alice tries to reassign her own note's user_id to Bob (should fail due to WITH CHECK) ==="
curl -s -i -X PATCH "$SUPABASE_URL/rest/v1/notes?id=eq.6" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H "Content-Type: application/json" -H "Prefer: return=representation" \
  -d "{\"user_id\":\"$BOB_UID\"}"
echo

echo "=== 9. Alice updates her own note title (should succeed) ==="
curl -s -i -X PATCH "$SUPABASE_URL/rest/v1/notes?id=eq.6" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H "Content-Type: application/json" -H "Prefer: return=representation" \
  -d '{"title":"Test insert updated"}'
echo

echo "=== 10. Alice deletes her own test note (cleanup, should succeed) ==="
curl -s -i -X DELETE "$SUPABASE_URL/rest/v1/notes?id=eq.6" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN" \
  -H "Prefer: return=representation"
echo

echo "=== 11. Anonymous INSERT attempt (should fail) ==="
curl -s -i -X POST "$SUPABASE_URL/rest/v1/notes" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $SUPABASE_ANON_KEY" \
  -H "Content-Type: application/json" \
  -d "{\"user_id\":\"$ALICE_UID\",\"title\":\"anon inject\",\"body\":\"x\"}"
echo

=== 6. Bob tries to update Alice's note (id=6) -> should affect 0 rows ===
HTTP/2 200 
date: Fri, 24 Jul 2026 04:27:44 GMT
content-type: application/json; charset=utf-8
content-length: 2
content-range: */*
cf-ray: a2002c91e8f4d20a-FRA
cf-cache-status: DYNAMIC
server: cloudflare
strict-transport-security: max-age=31536000; includeSubDomains; preload
x-content-type-options: nosniff
content-profile: public
preference-applied: return=representation
sb-gateway-version: 1
sb-project-ref: <ref>
sb-request-id: 019f9261-1739-7616-9824-6d143bbe5f83
x-envoy-attempt-count: 1
x-envoy-upstream-service-time: 3
set-cookie: __cf_bm=kDWMAYOfM46QY2V6iF6l2H40iUPNlI9y5btt46Uo5dk-1784867264.3070345-1.0.1.1-8X3aDnzm0zvl2845kmISYrTvfHbf03rupoaQXfqEpe0GsZ2VPHItvC7vofyBVdiuicVr7OjdztJAON7aUL3C_LY3nNjMZ2X3O085O03AJXY.sRyl5oSkH5PlenQ1l0e3; HttpOnly; SameSite=None; Secure; Path=/; Domain=supabase.co; Expires=Fri, 24 Jul 2026 04:57:44 GMT
alt-svc: h3=":443"; ma=86400

[]
=== 7. Bob tries to delete Alice's note (id=6) -> should affect 0 rows ===
HTTP/2 200 
date: Fri, 24 Jul 2026 04:27:44 GMT
content-type: application/json; charset=utf-8
content-length: 2
content-range: */*
cf-ray: a2002c92fab5dc88-FRA
cf-cache-status: DYNAMIC
server: cloudflare
strict-transport-security: max-age=31536000; includeSubDomains; preload
x-content-type-options: nosniff
content-profile: public
preference-applied: return=representation
sb-gateway-version: 1
sb-project-ref: <ref>
sb-request-id: 019f9261-17dc-7fd1-90ef-dfdffe1b5a98
x-envoy-attempt-count: 1
x-envoy-upstream-service-time: 2
set-cookie: __cf_bm=1XbaosG8RRB7kocR8gFTS60MxZFtUJQrAUqv.ts97uc-1784867264.4724634-1.0.1.1-IXxriZnCsGqyRCLOsR_58XKSpVe9Xz1V2y.Qu7TCe0R6.vbOJhyv_7ZSbno7ABjqW2cUBc99tOEPCaEYSHNylujpI9KisXy62J8Lnn1cCagkm9ktqf_FF_9IiprymBTF; HttpOnly; SameSite=None; Secure; Path=/; Domain=supabase.co; Expires=Fri, 24 Jul 2026 04:57:44 GMT
alt-svc: h3=":443"; ma=86400

[]
=== 8. Alice tries to reassign her own note's user_id to Bob (should fail due to WITH CHECK) ===
HTTP/2 403 
date: Fri, 24 Jul 2026 04:27:45 GMT
content-type: application/json; charset=utf-8
cf-ray: a2002c952bc0284d-FRA
cf-cache-status: DYNAMIC
set-cookie: __cf_bm=5FtptyP3ajJFoOU2NHlhGZAnUSRjlHEgEwXKJyhYP9s-1784867264.8211188-1.0.1.1-YAVY8BbmhetwjYV9IJ4zMUjfkGy0.FHySdcJ9OWoXgI.tqXDHCvUifSOHdwWxUke3w6UvlSrwfI_RC8pU1qBOq_UxdFD8Un3a4_VANRHWLHTXF5k2swEsM0DKoBGlhkE; HttpOnly; SameSite=None; Secure; Path=/; Domain=supabase.co; Expires=Fri, 24 Jul 2026 04:57:45 GMT
server: cloudflare
strict-transport-security: max-age=31536000; includeSubDomains; preload
vary: Accept-Encoding
proxy-status: PostgREST; error=42501
x-content-type-options: nosniff
sb-gateway-version: 1
sb-project-ref: <ref>
sb-request-id: 019f9261-1939-74c8-9466-a543770b5fb4
x-envoy-attempt-count: 1
x-envoy-upstream-service-time: 2
alt-svc: h3=":443"; ma=86400

{"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}
=== 9. Alice updates her own note title (should succeed) ===
HTTP/2 200 
date: Fri, 24 Jul 2026 04:27:45 GMT
content-type: application/json; charset=utf-8
content-range: 0-0/*
cf-ray: a2002c974f6b4db7-FRA
cf-cache-status: DYNAMIC
set-cookie: __cf_bm=Xvmp8aPe4DtDZkhpuMpF2TyQm1hje1lyvnXTfuyp5aM-1784867265.1617742-1.0.1.1-EQbCdFcb0.AuctAt59QsWt09Yba00ezg9DAAi7IGyqOyWPf96UKzjG2hA8M8mzLjAgL.srpwaQ8.auLo73zEysgpFBOwbQ1sDdHpifRUanLvCo8xbDt6rAEcWVT5Ecvx; HttpOnly; SameSite=None; Secure; Path=/; Domain=supabase.co; Expires=Fri, 24 Jul 2026 04:57:45 GMT
server: cloudflare
strict-transport-security: max-age=31536000; includeSubDomains; preload
vary: Accept-Encoding
x-content-type-options: nosniff
content-profile: public
preference-applied: return=representation
sb-gateway-version: 1
sb-project-ref: <ref>
sb-request-id: 019f9261-1a8f-77bb-842b-128c93f405ff
x-envoy-attempt-count: 1
x-envoy-upstream-service-time: 3
alt-svc: h3=":443"; ma=86400

[{"id":6,"user_id":"a952f866-0095-4ab1-8d6e-d2dba6f11616","title":"Test insert updated","body
… 2,164 more bytes — full output in the raw record
#9exit 0
ALICE_TOKEN=$(cat /tmp/alice.tok)
echo "=== check note 6 deleted? ==="
curl -s "$SUPABASE_URL/rest/v1/notes?id=eq.6&select=*" \
  -H "apikey: $SUPABASE_ANON_KEY" -H "Authorization: Bearer $ALICE_TOKEN"
echo
echo "=== final DB state (via service role / psql) ==="
psql "$SUPABASE_DB_URL" -c "SELECT id, user_id, title FROM public.notes ORDER BY id;"
=== check note 6 deleted? ===
[]
=== final DB state (via service role / psql) ===
 id |               user_id                |    title     
----+--------------------------------------+--------------
  1 | a952f866-0095-4ab1-8d6e-d2dba6f11616 | Groceries
  2 | a952f866-0095-4ab1-8d6e-d2dba6f11616 | Call plumber
  3 | 0d2b1cef-2c25-4c64-ac8b-37088be1063c | Gym plan
  4 | 0d2b1cef-2c25-4c64-ac8b-37088be1063c | Trip ideas
(4 rows)
#10exit 0
echo "=== service role can see all rows (bypasses RLS) ==="
curl -s "$SUPABASE_URL/rest/v1/notes?select=*" \
  -H "apikey: $SUPABASE_SERVICE_ROLE_KEY" -H "Authorization: Bearer $SUPABASE_SERVICE_ROLE_KEY"
echo
echo "=== anon key, no bearer override (default) ==="
curl -s -i "$SUPABASE_URL/rest/v1/notes?select=*" -H "apikey: $SUPABASE_ANON_KEY"

=== service role can see all rows (bypasses RLS) ===
[{"id":1,"user_id":"a952f866-0095-4ab1-8d6e-d2dba6f11616","title":"Groceries","body":"milk, eggs, coffee"}, 
 {"id":2,"user_id":"a952f866-0095-4ab1-8d6e-d2dba6f11616","title":"Call plumber","body":"kitchen sink leaks"}, 
 {"id":3,"user_id":"0d2b1cef-2c25-4c64-ac8b-37088be1063c","title":"Gym plan","body":"push pull legs"}, 
 {"id":4,"user_id":"0d2b1cef-2c25-4c64-ac8b-37088be1063c","title":"Trip ideas","body":"mountains in october"}]
=== anon key, no bearer override (default) ===
HTTP/2 401 
date: Fri, 24 Jul 2026 04:27:55 GMT
content-type: application/json; charset=utf-8
cf-ray: a2002cd65ce6d271-FRA
cf-cache-status: DYNAMIC
set-cookie: __cf_bm=yef3l.N9a3g99chg.64ppy.7QU1httvbo3to7MG4A6E-1784867275.2557278-1.0.1.1-DvRSqdLoFSJZedL9imTA6yINdLUMIKUlHzioM0Z9a1kM6oUAGQtzh3lz_z410298qLfIu.o8WfV6rs_1mejHcp0SrC0SDFBbvoPhimxBTqhKpw5kQFosy.A8hV2esNxf; HttpOnly; SameSite=None; Secure; Path=/; Domain=supabase.co; Expires=Fri, 24 Jul 2026 04:57:55 GMT
server: cloudflare
strict-transport-security: max-age=31536000; includeSubDomains; preload
vary: Accept-Encoding
www-authenticate: Bearer
proxy-status: PostgREST; error=42501
x-content-type-options: nosniff
sb-gateway-version: 1
sb-project-ref: <ref>
sb-request-id: 019f9261-41fb-7e69-b9dd-7207be447c83
x-envoy-attempt-count: 1
x-envoy-upstream-service-time: 1
alt-svc: h3=":443"; ma=86400

{"code":"42501","details":null,"hint":"Grant the required privileges to the current role with: GRANT SELECT ON public.notes TO anon;","message":"permission denied for table notes"}
#11exit 0
rm -f /tmp/alice.tok /tmp/bob.tok /tmp/alice.uid /tmp/bob.uid /tmp/lockdown.sql
echo cleaned up temp files
cleaned up temp files

What it said at the end

## Summary The `public.notes` table was wide open: RLS was disabled and both `anon` and `authenticated` roles had full table grants, so anyone with the anon key could read/write every user's notes. **Fix applied (via `SUPABASE_DB_URL`/psql):** 1. `ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY` + `FORCE ROW LEVEL SECURITY` (forces RLS even for the table owner/direct connections). 2. Created 4 owner-only policies for the `authenticated` role: - `notes_select_own` — `USING (auth.uid() = user_id)` - `notes_insert_own` — `WITH CHECK (auth.uid() = user_id)` (blocks inserting rows tagged with someone else's `user_id`) - `notes_update_own` — `USING` **and** `WITH CHECK (auth.uid() = user_id)` (blocks editing others' rows and blocks re-assigning `user_id` away from yourself) - `notes_delete_own` — `USING (auth.uid() = user_id)` 3. Tightened table grants: revoked all privileges on `notes` from `anon` (and re-granted only SELECT/INSERT/UPDATE/DELETE to `authenticated`), so anonymous requests now get a straightforward `permission denied` rather than relying on RLS alone. `service_role`/`postgres` retain full access for backend/admin use (RLS bypass by design). **Verified via the real REST API** (`/rest/v1/notes`) using anon key and real password logins for alice/bob: - Anonymous requests (with or without a bearer header) → `401/403 permission denied`, no rows. - Alice sees only her 2 notes; Bob sees only his 2 notes. - Alice inserting a row with Bob's `user_id` → `403 RLS violation`. - Alice inserting/updating/deleting her own rows → succeeds normally. - Bob attempting to UPDATE/DELETE Alice's note by id → succeeds at the HTTP level but affects **0 rows** (RLS filters it out), i.e. no cross-user tampering. - Alice attempting to change her own note's `user_id` to Bob's → blocked by `WITH CHECK`. - Service role key still sees all 4 original rows, confirming no data was modified — final state is exactly the original 4 notes (2 per user), plus my test insert was cleaned up. Owner-only access is enforced end-to-end through the REST API without breaking legitimate access paths.

10 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 1 FAIL: anon can read notes: {"code":"42501","details":null,"hint":"Grant the required privileges to the current role with: GRANT SELECT ON public.notes TO anon;","message":"permission denied for table notes"}

Check it yourself

Raw transcript · Task definition and verifier · Every attempt