以下问题的正确答案是什么?我会认为 EXECUTE 权限就足够了?? 谢谢!
数据库有一个名为 Customers
的表,由 UserA
拥有,另一个名为 Orders
的表由 UserB
拥有。您还拥有 UserB
拥有的存储过程 GetCustomerOrderInfo
。 GetCustomerOrderInfo
从两个表中选择数据。您创建了一个新用户 UserC
。您需要确保 UserC
可以调用 GetCustomerOrderInfo
存储过程。您还需要仅向 UserC
最佳答案
如果表和过程具有相同的所有者,则不会检查表的权限。这叫做 ownership chaining .
请注意,此上下文中的“所有权”是指“架构所有者”。例如,表 TestDB.Schema1.Table1
归拥有 Schema1
的用户所有。
因为 Orders
与 GetCustomerOrderInfo
拥有相同的所有者,所以存储过程具有从 Orders
中读取的隐式权限。
但是 Customers
有不同的所有者,因此您必须明确授予权限。
这是一个演示问题的测试脚本:
use Test
go
if exists (select * from sys.syslogins where name = 'UserA')
drop login UserA
create login UserA with password = 'Welcome'
if exists (select * from sys.syslogins where name = 'UserB')
drop login UserB
create login UserB with password = 'Welcome'
if exists (select * from sys.syslogins where name = 'UserC')
drop login UserC
create login UserC with password = 'Welcome'
if exists (select * from sys.tables where name = 'Customers' and schema_name(schema_id) = 'SchemaA')
drop table SchemaA.Customers
if exists (select * from sys.schemas where name = 'SchemaA')
drop schema SchemaA
if exists (select * from sys.sysusers where name = 'UserA')
drop user UserA
if exists (select * from sys.tables where name = 'Orders' and schema_name(schema_id) = 'SchemaB')
drop table SchemaB.Orders
if exists (select * from sys.procedures where name = 'GetCustomerOrderInfo' and schema_name(schema_id) = 'SchemaB')
drop procedure SchemaB.GetCustomerOrderInfo
if exists (select * from sys.schemas where name = 'SchemaB')
drop schema SchemaB
if exists (select * from sys.sysusers where name = 'UserB')
drop user UserB
if exists (select * from sys.sysusers where name = 'UserC')
drop user UserC
create user UserA for login UserA
alter role db_owner add member UserA
go
create schema SchemaA authorization UserA
go
create user UserB for login UserB
alter role db_owner add member UserB
go
create schema SchemaB authorization UserB
go
create user UserC for login UserC
create table SchemaA.Customers (id int identity)
create table SchemaB.Orders (id int identity, CustomerId int)
go
create procedure SchemaB.GetCustomerOrderInfo
as
select *
from SchemaB.Orders o
join SchemaA.Customers c
on c.id = o.CustomerId
go
当我们都设置好后,我们可以用不同的权限测试程序。首先我们需要对存储过程的执行权限,然后是对Customers
的读取权限。之后,即使我们没有授予对 Orders
的读取权限,存储过程也能正常工作。
execute as login = 'UserC' -- Login as UserC
exec SchemaB.GetCustomerOrderInfo
-- The EXECUTE permission was denied on the object 'GetCustomerOrderInfo', database 'Test', schema 'SchemaB'
revert -- Revert back to our original login
grant execute on SchemaB.GetCustomerOrderInfo to UserC
execute as login = 'UserC'
exec SchemaB.GetCustomerOrderInfo
-- The SELECT permission was denied on the object 'Customers', database 'Test', schema 'SchemaA'.
revert
grant select on SchemaA.Customers to UserC
execute as login = 'UserC'
exec SchemaB.GetCustomerOrderInfo
-- (0 row(s) affected)
revert
关于SQL Server 用户对存储过程和基础表的权限,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19517251/