sql - 具有 session 变量的 postgresql 行级安全性

Question

我正在学习使用 session 变量的 postgres 行级安全性。

create table user_table (
    username text,
    idx integer
);
alter table user_table enable row level security;
create policy user_p on user_table for select
using (idx <= (current_setting('my.idx',true)::int));

insert into user_table values('1',1),('2',2),('3',3);

输出:

# set my.idx = 2;
SET
# select * from user_table;
 username | idx
----------+-----
 1        |   1
 2        |   2
 3        |   3
(3 rows)

它应该显示用户名为“1”和“2”的 user_table，但它显示了所有内容。我错过了什么导致这个问题？

Answer 1

https://www.postgresql.org/docs/current/static/ddl-rowsecurity.html

When row security is enabled on a table (with ALTER TABLE ... ENABLE ROW LEVEL SECURITY), all normal access to the table for selecting rows or modifying rows must be allowed by a row security policy. (However, the table's owner is typically not subject to row security policies.)

(强调我的)

检查:

db=# grant select on user_table to ro;
GRANT
Time: 24.374 ms
db=# set role ro;
SET
Time: 0.305 ms
db=> select * from user_table;
 username | idx
----------+-----
 1        |   1
 2        |   2
(2 rows)

Time: 10.557 ms
db=> set my.idx = 1;
SET
Time: 8.595 ms
db=> select * from user_table;
 username | idx
----------+-----
 1        |   1
(1 row)