fix(db): lock increment_daily_usage and admin analytics RPCs to service_role
This commit is contained in:
Yun Chan
parent
e69fe0335d
commit
63bc0ebe69
2 changed files with 483 additions and 0 deletions
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-- ============================================================================
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-- 20260929000001_function_acl_hardening.sql
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--
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-- Function execution ACL hardening.
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--
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-- Background
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-- Supabase's default privileges give every function that postgres creates in
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-- schema public a *direct* EXECUTE grant to anon, authenticated and
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-- service_role. `REVOKE ... FROM PUBLIC` therefore does not lock anon out.
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-- Three early migrations only revoked PUBLIC (and sometimes authenticated):
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-- * 20260409000003 increment_daily_usage -> anon could add any (negative)
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-- amount to any user's daily_usage, wiping or exhausting quota.
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-- * 20260413000004 admin_usage_by_feature / admin_top_users / admin_dau ->
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-- SECURITY DEFINER bodies with no role predicate, callable by anon and
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-- every signed-in user; admin_top_users leaks user ids and names.
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--
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-- Policy (single place; enforced by tests/function-acl.integration.sql)
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-- * No SECURITY DEFINER function in schema public is executable by anon.
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-- * SECURITY DEFINER trigger functions are executable by nobody but the
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-- owner and service_role (triggers do not check EXECUTE when they fire).
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-- * authenticated may execute a SECURITY DEFINER function only if it is on
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-- the reviewed allowlist in tests/function-acl.integration.sql.
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-- * Every SECURITY DEFINER function pins search_path.
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-- New migrations keep writing their own
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-- REVOKE ALL ON FUNCTION ... FROM PUBLIC, anon[, authenticated];
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-- GRANT EXECUTE ON FUNCTION ... TO <the roles that need it>;
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-- and add authenticated RPCs to the test allowlist. An omission is caught by
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-- the local integration test (it is not run by CI yet).
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--
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-- Why default privileges are NOT changed here
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-- A deny-by-default `ALTER DEFAULT PRIVILEGES` only works for anon if it is
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-- the schema-less (global) form, because anon inherits the built-in PUBLIC
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-- EXECUTE default. The global form also strips PUBLIC EXECUTE from pg_temp
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-- helpers created by postgres, which breaks every integration test that
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-- calls pg_temp.assert_true()/act_as() after SET ROLE authenticated, and it
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-- would silently change the ACL of functions created by later migrations
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-- that are being written against the current defaults. The schema-scoped
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-- form alone is a no-op for anon. The sweep below plus the catalog test give
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-- the same guarantee without those side effects.
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-- ============================================================================
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-- ----------------------------------------------------------------------------
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-- 1. Sweep: apply the policy to every existing SECURITY DEFINER function in
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-- schema public. authenticated/service_role access is preserved exactly
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-- (except for trigger functions, which cannot be called directly anyway);
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-- only anon/PUBLIC access is removed.
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-- ----------------------------------------------------------------------------
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DO $$
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DECLARE
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fn record;
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target text;
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keep_authenticated boolean;
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keep_service_role boolean;
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BEGIN
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FOR fn IN
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SELECT p.oid,
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n.nspname,
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p.proname,
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pg_get_function_identity_arguments(p.oid) AS identity_args,
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p.prorettype = 'trigger'::regtype AS is_trigger
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FROM pg_proc p
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JOIN pg_namespace n ON n.oid = p.pronamespace
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WHERE n.nspname = 'public'
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AND p.prosecdef
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LOOP
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target := format('%I.%I(%s)', fn.nspname, fn.proname, fn.identity_args);
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keep_authenticated := NOT fn.is_trigger
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AND has_function_privilege('authenticated', fn.oid, 'EXECUTE');
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keep_service_role := has_function_privilege('service_role', fn.oid, 'EXECUTE');
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EXECUTE format('REVOKE ALL ON ROUTINE %s FROM PUBLIC, anon', target);
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IF fn.is_trigger THEN
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EXECUTE format('REVOKE ALL ON ROUTINE %s FROM authenticated', target);
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END IF;
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-- Re-grant access that previously flowed only through PUBLIC.
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IF keep_authenticated THEN
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EXECUTE format('GRANT EXECUTE ON ROUTINE %s TO authenticated', target);
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END IF;
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IF keep_service_role THEN
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EXECUTE format('GRANT EXECUTE ON ROUTINE %s TO service_role', target);
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END IF;
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END LOOP;
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END;
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$$;
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-- ----------------------------------------------------------------------------
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-- 2. increment_daily_usage: service_role only, and the counter can no longer
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-- go below zero. Negative amounts stay allowed for the service-role refund
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-- path (functions/_shared/embedding-quota.ts releases reserved units with a
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-- negative amount), but the stored total is clamped at 0.
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-- ----------------------------------------------------------------------------
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CREATE OR REPLACE FUNCTION public.increment_daily_usage(
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p_user_id uuid,
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p_feature text,
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p_amount integer DEFAULT 1
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)
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RETURNS integer
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LANGUAGE plpgsql
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SECURITY DEFINER
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SET search_path = ''
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AS $$
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DECLARE
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v_new_count integer;
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BEGIN
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IF p_user_id IS NULL OR p_feature IS NULL OR p_amount IS NULL THEN
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RAISE EXCEPTION 'increment_daily_usage: arguments must not be null'
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USING ERRCODE = '22004';
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END IF;
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INSERT INTO public.daily_usage (user_id, date, feature, count)
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VALUES (p_user_id, CURRENT_DATE, p_feature, greatest(p_amount, 0))
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ON CONFLICT (user_id, date, feature)
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DO UPDATE SET count = greatest(public.daily_usage.count + p_amount, 0)
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RETURNING count INTO v_new_count;
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RETURN v_new_count;
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END;
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$$;
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REVOKE ALL ON FUNCTION public.increment_daily_usage(uuid, text, integer)
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FROM PUBLIC, anon, authenticated;
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GRANT EXECUTE ON FUNCTION public.increment_daily_usage(uuid, text, integer)
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TO service_role;
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-- ----------------------------------------------------------------------------
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-- 3. daily_usage.count is a usage counter; negative totals are never valid.
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-- Legitimate decrements (quota reservation release) already clamp with
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-- greatest(count - 1, 0). Any negative row can only come from the abuse
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-- above, so it is normalised to 0 before the constraint is validated.
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-- ----------------------------------------------------------------------------
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UPDATE public.daily_usage
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SET count = 0
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WHERE count < 0;
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DO $$
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BEGIN
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IF NOT EXISTS (
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SELECT 1
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FROM pg_constraint
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WHERE conrelid = 'public.daily_usage'::regclass
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AND conname = 'daily_usage_count_nonnegative'
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) THEN
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ALTER TABLE public.daily_usage
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ADD CONSTRAINT daily_usage_count_nonnegative CHECK (count >= 0);
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END IF;
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END;
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$$;
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-- ----------------------------------------------------------------------------
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-- 4. Platform analytics RPCs: service_role only. Their bodies have no role
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-- predicate and run as definer (RLS bypassed), so no end-user role may call
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-- them. The admin console reads Supabase with the service-role key, like
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-- the other admin_*_v1 RPCs.
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-- ----------------------------------------------------------------------------
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REVOKE ALL ON FUNCTION public.admin_usage_by_feature(date, date)
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FROM PUBLIC, anon, authenticated;
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GRANT EXECUTE ON FUNCTION public.admin_usage_by_feature(date, date)
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TO service_role;
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REVOKE ALL ON FUNCTION public.admin_top_users(date, date, integer)
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FROM PUBLIC, anon, authenticated;
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GRANT EXECUTE ON FUNCTION public.admin_top_users(date, date, integer)
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TO service_role;
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REVOKE ALL ON FUNCTION public.admin_dau(date, date)
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FROM PUBLIC, anon, authenticated;
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GRANT EXECUTE ON FUNCTION public.admin_dau(date, date)
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TO service_role;
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COMMENT ON FUNCTION public.increment_daily_usage(uuid, text, integer) IS
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'service_role only. Adds p_amount to today''s usage counter, clamped at 0.';
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COMMENT ON FUNCTION public.admin_usage_by_feature(date, date) IS
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'service_role only. Platform analytics; no caller role predicate in body.';
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COMMENT ON FUNCTION public.admin_top_users(date, date, integer) IS
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'service_role only. Returns user ids and names; no caller role predicate in body.';
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COMMENT ON FUNCTION public.admin_dau(date, date) IS
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'service_role only. Platform analytics; no caller role predicate in body.';
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-- ----------------------------------------------------------------------------
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-- 5. Self-check: fail the migration if any public SECURITY DEFINER function is
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-- still executable by anon.
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-- ----------------------------------------------------------------------------
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DO $$
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DECLARE
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offenders text;
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BEGIN
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SELECT string_agg(p.oid::regprocedure::text, ', ' ORDER BY p.oid::regprocedure::text)
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INTO offenders
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FROM pg_proc p
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WHERE p.pronamespace = 'public'::regnamespace
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AND p.prosecdef
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AND has_function_privilege('anon', p.oid, 'EXECUTE');
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IF offenders IS NOT NULL THEN
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RAISE EXCEPTION 'function_acl_hardening: anon can still execute SECURITY DEFINER functions: %',
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offenders;
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END IF;
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END;
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$$;
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283
server/supabase/tests/function-acl.integration.sql
Normal file
283
server/supabase/tests/function-acl.integration.sql
Normal file
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@ -0,0 +1,283 @@
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\set ON_ERROR_STOP on
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-- Function execution ACL policy (see migrations/20260929000001_function_acl_hardening.sql).
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--
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-- * Every SECURITY DEFINER function in schema public pins search_path.
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-- * anon cannot execute any SECURITY DEFINER function in schema public.
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-- * SECURITY DEFINER trigger functions are not executable by authenticated.
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-- * authenticated can execute a SECURITY DEFINER function only if it is on
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-- the reviewed allowlist below. Adding an authenticated RPC means adding
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-- it here on purpose; a forgotten REVOKE fails this test.
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-- * increment_daily_usage and the admin analytics RPCs are service_role only,
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-- and daily_usage.count can never go negative.
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--
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-- Local only: psql against the local Supabase stack. Runs in a transaction and
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-- rolls back.
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BEGIN;
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CREATE OR REPLACE FUNCTION pg_temp.assert_true(condition boolean, message text)
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RETURNS void
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LANGUAGE plpgsql
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AS $$
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BEGIN
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IF condition IS NOT TRUE THEN
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RAISE EXCEPTION 'assertion_failed: %', message;
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END IF;
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END;
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$$;
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-- Reviewed allowlist: SECURITY DEFINER functions that signed-in users may call
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-- directly. Each one must derive the caller from auth.uid() (or enforce its own
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-- role check) inside the body.
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CREATE TEMP TABLE authenticated_definer_allowlist (proname text PRIMARY KEY) ON COMMIT DROP;
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INSERT INTO authenticated_definer_allowlist (proname) VALUES
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('accept_team_invite'),
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('admin_act_on_content_report_v1'),
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('admin_list_content_reports_v1'),
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('bootstrap_custom_instructions'),
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('bootstrap_user_templates_v1'),
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('cancel_team_invite'),
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('create_team'),
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('create_team_activity'),
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('create_team_invite'),
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('create_user_template_v1'),
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('delete_user_template_v1'),
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('export_account_portability'),
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('list_team_invites'),
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('list_team_members'),
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('mobile_add_memo_tag_v1'),
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('mobile_begin_meeting_processing'),
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('mobile_begin_meeting_recording'),
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('mobile_cancel_meeting_recording'),
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('mobile_complete_meeting_processing'),
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('mobile_create_meeting_workspace_v2'),
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('mobile_fail_meeting_recording'),
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('mobile_list_memo_tags_v1'),
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('mobile_mark_meeting_processing_failure'),
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('mobile_queue_meeting_recording'),
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('mobile_remove_memo_tag_v1'),
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('mobile_rename_memo_tag_v1'),
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('mobile_search_memos_v1'),
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('purge_revoked_device'),
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('register_push_registration'),
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('remove_team_member'),
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('reorder_custom_instruction'),
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('reserve_push_dispatch'),
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('resolve_team_invite_recipient'),
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('restore_account_portability'),
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('revoke_device'),
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('select_user_template_v1'),
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('set_active_custom_instruction'),
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('sync_delete_user_template_v1'),
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('sync_set_builtin_instruction_prompt_v1'),
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('sync_upsert_user_template_v1'),
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('unregister_current_device'),
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('unregister_push_registration'),
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('update_team_member_role'),
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('update_user_template_v1'),
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('user_admin_team_ids'),
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('user_team_ids');
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-- Offender queries, shared by the detector self-check and the real checks.
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CREATE OR REPLACE FUNCTION pg_temp.definer_functions_executable_by(p_role text)
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RETURNS text
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LANGUAGE sql
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STABLE
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AS $$
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SELECT string_agg(p.oid::regprocedure::text, ', ' ORDER BY p.oid::regprocedure::text)
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FROM pg_proc p
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WHERE p.pronamespace = 'public'::regnamespace
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AND p.prosecdef
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AND has_function_privilege(p_role, p.oid, 'EXECUTE');
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$$;
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-- ---------------------------------------------------------------------------
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-- 0. Detector self-check: a new SECURITY DEFINER function without an explicit
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-- REVOKE is callable by anon under the platform defaults, and the offender
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-- query must report it. This proves a forgotten REVOKE is caught.
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-- ---------------------------------------------------------------------------
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CREATE FUNCTION public.zz_function_acl_probe_v1()
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RETURNS integer
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LANGUAGE sql
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SECURITY DEFINER
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SET search_path = ''
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AS 'SELECT 1';
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SELECT pg_temp.assert_true(
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position('zz_function_acl_probe_v1()' IN coalesce(pg_temp.definer_functions_executable_by('anon'), '')) > 0,
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'offender query must detect a SECURITY DEFINER function missing its REVOKE'
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);
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DROP FUNCTION public.zz_function_acl_probe_v1();
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-- ---------------------------------------------------------------------------
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-- 1. Catalog policy.
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-- ---------------------------------------------------------------------------
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DO $$
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DECLARE
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offenders text;
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BEGIN
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SELECT string_agg(p.oid::regprocedure::text, ', ' ORDER BY p.oid::regprocedure::text)
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INTO offenders
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FROM pg_proc p
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WHERE p.pronamespace = 'public'::regnamespace
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AND p.prosecdef
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AND NOT EXISTS (
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SELECT 1 FROM unnest(coalesce(p.proconfig, ARRAY[]::text[])) AS cfg(setting)
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WHERE cfg.setting LIKE 'search_path=%'
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);
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PERFORM pg_temp.assert_true(
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offenders IS NULL,
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'SECURITY DEFINER functions without a pinned search_path: ' || coalesce(offenders, '')
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);
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END;
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$$;
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DO $$
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DECLARE
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offenders text := pg_temp.definer_functions_executable_by('anon');
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BEGIN
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PERFORM pg_temp.assert_true(
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offenders IS NULL,
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'anon can execute SECURITY DEFINER functions: ' || coalesce(offenders, '')
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);
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END;
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$$;
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DO $$
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DECLARE
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offenders text;
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BEGIN
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SELECT string_agg(p.oid::regprocedure::text, ', ' ORDER BY p.oid::regprocedure::text)
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INTO offenders
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FROM pg_proc p
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WHERE p.pronamespace = 'public'::regnamespace
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AND p.prosecdef
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AND p.prorettype = 'trigger'::regtype
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AND has_function_privilege('authenticated', p.oid, 'EXECUTE');
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PERFORM pg_temp.assert_true(
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offenders IS NULL,
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'authenticated can execute SECURITY DEFINER trigger functions: ' || coalesce(offenders, '')
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);
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END;
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$$;
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DO $$
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DECLARE
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offenders text;
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BEGIN
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SELECT string_agg(p.oid::regprocedure::text, ', ' ORDER BY p.oid::regprocedure::text)
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INTO offenders
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FROM pg_proc p
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WHERE p.pronamespace = 'public'::regnamespace
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AND p.prosecdef
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AND has_function_privilege('authenticated', p.oid, 'EXECUTE')
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AND NOT EXISTS (
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SELECT 1 FROM authenticated_definer_allowlist a WHERE a.proname = p.proname
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);
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PERFORM pg_temp.assert_true(
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offenders IS NULL,
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'authenticated can execute SECURITY DEFINER functions outside the reviewed allowlist: '
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|| coalesce(offenders, '')
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);
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END;
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$$;
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-- ---------------------------------------------------------------------------
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-- 2. Service-role-only functions.
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-- ---------------------------------------------------------------------------
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DO $$
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DECLARE
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fn text;
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BEGIN
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FOREACH fn IN ARRAY ARRAY[
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'public.increment_daily_usage(uuid,text,integer)',
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'public.admin_usage_by_feature(date,date)',
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'public.admin_top_users(date,date,integer)',
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'public.admin_dau(date,date)'
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] LOOP
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PERFORM pg_temp.assert_true(
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NOT has_function_privilege('anon', fn, 'EXECUTE'),
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'anon must not execute ' || fn
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);
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PERFORM pg_temp.assert_true(
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NOT has_function_privilege('authenticated', fn, 'EXECUTE'),
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'authenticated must not execute ' || fn
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);
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PERFORM pg_temp.assert_true(
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has_function_privilege('service_role', fn, 'EXECUTE'),
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'service_role must execute ' || fn
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);
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END LOOP;
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END;
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$$;
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-- ---------------------------------------------------------------------------
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-- 3. daily_usage counter integrity.
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-- ---------------------------------------------------------------------------
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INSERT INTO auth.users (
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id, aud, role, email, encrypted_password, email_confirmed_at,
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raw_app_meta_data, raw_user_meta_data, created_at, updated_at
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) VALUES (
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'a1000000-0000-4000-8000-000000000001', 'authenticated', 'authenticated',
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'function-acl-one@example.invalid', crypt('fixture-password', gen_salt('bf')), now(),
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'{"provider":"email","providers":["email"]}'::jsonb, '{}'::jsonb, now(), now()
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);
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SELECT pg_temp.assert_true(
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EXISTS (
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SELECT 1 FROM pg_constraint
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WHERE conrelid = 'public.daily_usage'::regclass
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AND conname = 'daily_usage_count_nonnegative'
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AND convalidated
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),
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'daily_usage.count has a validated non-negative CHECK'
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);
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SELECT pg_temp.assert_true(
|
||||
public.increment_daily_usage('a1000000-0000-4000-8000-000000000001', 'acl_probe', 5) = 5,
|
||||
'service path increments the counter'
|
||||
);
|
||||
SELECT pg_temp.assert_true(
|
||||
public.increment_daily_usage('a1000000-0000-4000-8000-000000000001', 'acl_probe', -2) = 3,
|
||||
'service path refunds with a negative amount'
|
||||
);
|
||||
SELECT pg_temp.assert_true(
|
||||
public.increment_daily_usage('a1000000-0000-4000-8000-000000000001', 'acl_probe', -1000000) = 0,
|
||||
'a refund larger than the counter clamps at zero'
|
||||
);
|
||||
SELECT pg_temp.assert_true(
|
||||
public.increment_daily_usage('a1000000-0000-4000-8000-000000000001', 'acl_probe_new', -7) = 0,
|
||||
'a negative first write stores zero'
|
||||
);
|
||||
|
||||
DO $$
|
||||
BEGIN
|
||||
PERFORM public.increment_daily_usage('a1000000-0000-4000-8000-000000000001', 'acl_probe', NULL);
|
||||
RAISE EXCEPTION 'assertion_failed: NULL amount was accepted';
|
||||
EXCEPTION
|
||||
WHEN null_value_not_allowed THEN
|
||||
NULL;
|
||||
END;
|
||||
$$;
|
||||
|
||||
DO $$
|
||||
BEGIN
|
||||
UPDATE public.daily_usage
|
||||
SET count = -1
|
||||
WHERE user_id = 'a1000000-0000-4000-8000-000000000001'
|
||||
AND feature = 'acl_probe';
|
||||
RAISE EXCEPTION 'assertion_failed: negative daily_usage.count was stored';
|
||||
EXCEPTION
|
||||
WHEN check_violation THEN
|
||||
NULL;
|
||||
END;
|
||||
$$;
|
||||
|
||||
-- Call-time rejection for anon/authenticated is what PostgREST enforces via
|
||||
-- the EXECUTE privilege asserted in section 2. It is intentionally not probed
|
||||
-- with SET ROLE + a PL/pgSQL EXCEPTION handler here: on the local Supabase
|
||||
-- image that combination segfaults the backend and restarts the database.
|
||||
|
||||
ROLLBACK;
|
||||
Loading…
Add table
Add a link
Reference in a new issue