创建、附加、分离和删除 RLS 策略

您可以执行以下操作：

下面是一个端到端的示例，用于说明超级用户如何创建某些用户和角色。然后，具有 secadmin 角色的用户将创建、附加、分离和删除 RLS 策略。此示例使用 tickit 示例数据库。有关更多信息，请参阅《Amazon Redshift 入门指南》中的将数据从 Amazon S3 加载到 Amazon Redshift。

-- Create users and roles referenced in the policy statements.
CREATE ROLE analyst;
CREATE ROLE consumer;
CREATE ROLE dbadmin;
CREATE ROLE auditor;
CREATE USER bob WITH PASSWORD 'Name_is_bob_1';
CREATE USER alice WITH PASSWORD 'Name_is_alice_1';
CREATE USER joe WITH PASSWORD 'Name_is_joe_1';
CREATE USER molly WITH PASSWORD 'Name_is_molly_1';
CREATE USER bruce WITH PASSWORD 'Name_is_bruce_1';
GRANT ROLE sys:secadmin TO bob;
GRANT ROLE analyst TO alice;
GRANT ROLE consumer TO joe;
GRANT ROLE dbadmin TO molly;
GRANT ROLE auditor TO bruce;
GRANT ALL ON TABLE tickit_category_redshift TO PUBLIC;
GRANT ALL ON TABLE tickit_sales_redshift TO PUBLIC;
GRANT ALL ON TABLE tickit_event_redshift TO PUBLIC;

-- Create table and schema referenced in the policy statements.
CREATE SCHEMA target_schema;
GRANT ALL ON SCHEMA target_schema TO PUBLIC;
CREATE TABLE target_schema.target_event_table (LIKE tickit_event_redshift);
GRANT ALL ON TABLE target_schema.target_event_table TO PUBLIC;

-- Change session to analyst alice.
SET SESSION AUTHORIZATION alice;

-- Check the tuples visible to analyst alice.
-- Should contain all 3 categories.
SELECT catgroup, count(*)
FROM tickit_category_redshift
GROUP BY catgroup ORDER BY catgroup;

-- Change session to security administrator bob.
SET SESSION AUTHORIZATION bob;

CREATE RLS POLICY policy_concerts
WITH (catgroup VARCHAR(10))
USING (catgroup = 'Concerts');

SELECT poldb, polname, polalias, polatts, polqual, polenabled, polmodifiedby FROM svv_rls_policy WHERE poldb = CURRENT_DATABASE();

ATTACH RLS POLICY policy_concerts ON tickit_category_redshift TO ROLE analyst, ROLE dbadmin;

ALTER TABLE tickit_category_redshift ROW LEVEL SECURITY ON;

SELECT * FROM svv_rls_attached_policy;

-- Change session to analyst alice.
SET SESSION AUTHORIZATION alice;

-- Check that tuples with only `Concert` category will be visible to analyst alice.
SELECT catgroup, count(*)
FROM tickit_category_redshift
GROUP BY catgroup ORDER BY catgroup;

-- Change session to consumer joe.
SET SESSION AUTHORIZATION joe;

-- Although the policy is attached to a different role, no tuples will be
-- visible to consumer joe because the default deny all policy is applied.
SELECT catgroup, count(*)
FROM tickit_category_redshift
GROUP BY catgroup ORDER BY catgroup;

-- Change session to dbadmin molly.
SET SESSION AUTHORIZATION molly;

-- Check that tuples with only `Concert` category will be visible to dbadmin molly.
SELECT catgroup, count(*)
FROM tickit_category_redshift
GROUP BY catgroup ORDER BY catgroup;

-- Check that EXPLAIN output contains RLS SecureScan to prevent disclosure of
-- sensitive information such as RLS filters.
EXPLAIN SELECT catgroup, count(*) FROM tickit_category_redshift GROUP BY catgroup ORDER BY catgroup;

-- Change session to security administrator bob.
SET SESSION AUTHORIZATION bob;

-- Grant IGNORE RLS permission so that RLS policies do not get applicable to role dbadmin.
GRANT IGNORE RLS TO ROLE dbadmin;

-- Grant EXPLAIN RLS permission so that anyone in role auditor can view complete EXPLAIN output.
GRANT EXPLAIN RLS TO ROLE auditor;

-- Change session to dbadmin molly.
SET SESSION AUTHORIZATION molly;

-- Check that all tuples are visible to dbadmin molly because `IGNORE RLS` is granted to role dbadmin.
SELECT catgroup, count(*)
FROM tickit_category_redshift
GROUP BY catgroup ORDER BY catgroup;

-- Change session to auditor bruce.
SET SESSION AUTHORIZATION bruce;

-- Check explain plan is visible to auditor bruce because `EXPLAIN RLS` is granted to role auditor.
EXPLAIN SELECT catgroup, count(*) FROM tickit_category_redshift GROUP BY catgroup ORDER BY catgroup;

-- Change session to security administrator bob.
SET SESSION AUTHORIZATION bob;

DETACH RLS POLICY policy_concerts ON tickit_category_redshift FROM ROLE analyst, ROLE dbadmin;

-- Change session to analyst alice.
SET SESSION AUTHORIZATION alice;

-- Check that no tuples are visible to analyst alice.
-- Although the policy is detached, no tuples will be visible to analyst alice
-- because of default deny all policy is applied if the table has RLS on.
SELECT catgroup, count(*)
FROM tickit_category_redshift
GROUP BY catgroup ORDER BY catgroup;

-- Change session to security administrator bob.
SET SESSION AUTHORIZATION bob;

CREATE RLS POLICY policy_events
WITH (eventid INTEGER) AS ev
USING (
    ev.eventid IN (SELECT eventid FROM tickit_sales_redshift WHERE qtysold <3)
);

ATTACH RLS POLICY policy_events ON tickit_event_redshift TO ROLE analyst;
ATTACH RLS POLICY policy_events ON target_schema.target_event_table TO ROLE consumer;

RESET SESSION AUTHORIZATION;

-- Can not cannot alter type of dependent column.
ALTER TABLE target_schema.target_event_table ALTER COLUMN eventid TYPE float;
ALTER TABLE tickit_event_redshift ALTER COLUMN eventid TYPE float;
ALTER TABLE tickit_sales_redshift ALTER COLUMN eventid TYPE float;
ALTER TABLE tickit_sales_redshift ALTER COLUMN qtysold TYPE float;

-- Can not cannot rename dependent column.
ALTER TABLE target_schema.target_event_table RENAME COLUMN eventid TO renamed_eventid;
ALTER TABLE tickit_event_redshift RENAME COLUMN eventid TO renamed_eventid;
ALTER TABLE tickit_sales_redshift RENAME COLUMN eventid TO renamed_eventid;
ALTER TABLE tickit_sales_redshift RENAME COLUMN qtysold TO renamed_qtysold;

-- Can not drop dependent column.
ALTER TABLE target_schema.target_event_table DROP COLUMN eventid CASCADE;
ALTER TABLE tickit_event_redshift DROP COLUMN eventid CASCADE;
ALTER TABLE tickit_sales_redshift DROP COLUMN eventid CASCADE;
ALTER TABLE tickit_sales_redshift DROP COLUMN qtysold CASCADE;

-- Can not drop lookup table.
DROP TABLE tickit_sales_redshift CASCADE;

-- Change session to security administrator bob.
SET SESSION AUTHORIZATION bob;

DROP RLS POLICY policy_concerts;
DROP RLS POLICY IF EXISTS policy_events;

ALTER TABLE tickit_category_redshift ROW LEVEL SECURITY OFF;

RESET SESSION AUTHORIZATION;

-- Drop users and roles.
DROP USER bob;
DROP USER alice;
DROP USER joe;
DROP USER molly;
DROP USER bruce;
DROP ROLE analyst;
DROP ROLE consumer;
DROP ROLE auditor FORCE;
DROP ROLE dbadmin FORCE;