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SQL Server 2005 allows a user to impersonate another user for a specific block of code. This is achieved using the EXECUTE AS clause, which is added to the CREATE/ALTER statements for procedures, functions, triggers, and Service Broker queues. Unlike the existing SETUSER, EXECUTE AS isn t restricted to members of the sysadmin fixed server role or the db_owner database role. This is important, because the impersonating account doesn t need to have access to the objects referenced in the module (the procedure, function, etc.), so long as it has permission to execute the module, and the impersonated account has the requisite permissions to access the referenced objects. This means that we can force access to data through particular database objects, rather than directly through the database tables. Note that the default is for modules to be executed under the caller s account, so without impersonation, the caller wouldn t be able to access the data at all. To see how this works, open up a query window in Management Studio and create a couple of new users in the AdventureWorks database: USE AdventureWorks GO CREATE LOGIN John WITH PASSWORD = '34r%*Fs$lK!9'; CREATE LOGIN Jane WITH PASSWORD = '4LWcm&(^o!HXk'; CREATE USER John FOR LOGIN John; CREATE USER Jane FOR LOGIN Jane; GO Now give John SELECT permission on the database by adding that account to the db_datareader fixed database role, and permission to create stored procedures by adding him to the db_ddladmin role:

12. Once the grid toward the bottom of the dialog is populated, enter 98052 as the value for the Value column. You could have used a variable here instead, in which case you would have checked the Variable check box. 98052 is the ZIP code for One Microsoft Way, Redmond, WA. Your configuration screen should now look like Figure 6-54. Notice how the grid shows the parameter value expected and its datatype.

Figure 9-5. Choosing a debugger If you select New instance of Visual Studio 2005 on this screen, you will be able to step through the code and set breakpoints and watches, exactly as you would in the full version of VS (see Figure 9-6).

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EXEC sp_addrolemember 'db_datareader', 'John'; EXEC sp_addrolemember 'db_ddladmin', 'John'; GO Now we can create a new stored procedure that reads some data from the database We set the EXECUTE AS clause so that the procedure will always impersonate John: CREATE PROCEDURE usp_GetAddresses WITH EXECUTE AS 'John' AS SELECT * FROM PersonAddress; GO We ll use the new ALTER AUTHORIZATION command to set the owner of this procedure to the new user, John, to create this, so that the procedure has a different owner from the underlying tables.

Figure 6-54. Supplying the ZIP code parameter 13. Move on to the next configuration screen by selecting the Output item from the list on the left. 14. Configuration on this tab is simple. Change the OutputType to Variable, and change the Variable property to the name of our variable in this case User::myWebMethodResult. Figure 6-55 shows these configuration settings. Once everything is configured, click OK. 15. To get some feedback from the Web Service Task that is, that the value held in the myWebMethodResult variable has changed let s add a Script Task. Drop a Script Task from the Toolbox onto the design surface, somewhere below the Web Service Task.

This breaks the chain of ownership, and forces SQL Server to check the permissions on the underlying objects: ALTER AUTHORIZATION ON usp_GetAddresses TO John; Finally, let s give Jane permission to execute this procedure (but not to access the data directly): SETUSER GRANT EXECUTE ON usp_GetAddresses TO Jane; To test that this has worked, switch to the user Jane and verify that you can t read data in it: SETUSER 'Jane' SELECT * FROM PersonAddress; You should see this error message, confirming that Jane can t access the data directly: SELECT permission denied on object 'Address', database 'AdventureWorks', schema 'Person' Now execute the stored procedure we just created: EXEC usp_GetAddresses; This should run fine and return the data as expected, proving that we ve forced Jane to access the data through the stored procedure by not granting her SELECT permission on the table.

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