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CHAPTER 8 MANAGING SQL SERVER EXPRESS SECURITY
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USE NewDB1 GO CREATE PROC RestoreTrackPersons AS DELETE FROM TrackPersons INSERT INSERT INSERT INSERT GO TrackPersons TrackPersons TrackPersons TrackPersons VALUES(1, vALUES(2, VALUES(3, VALUES(4, 'Rick Dobosn') 'Virginia Dobson') 'Name to change') 'Name to delete')
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It is important to initialize the security settings for the cab233a\winlogin1 user so that it belongs to just the db_datareader and db_datawriter fixed database roles in the NewDB1 database. The following three statements verify the role members of the fixed database roles before initializing the contents of the TrackPersons table. If the cab233a\winlogin1 user does not appear in the proper roles, use the sp_addrolemember or sp_droprolemember system-stored procedure to achieve the proper role memberships for the user. A SELECT statement confirms the initial values in the TrackPersons table inserted by the RestoreTrackPersons stored procedure. The four INSERT statements in the RestoreTrackPersons stored procedure define the values returned by the SELECT statement. EXEC sp_helprolemember EXEC RestoreTrackPersons SELECT * FROM TrackPersons The first block of code running an EXECUTE AS statement is shown next. This block runs with the cab233a\winlogin1 user belonging to the db_datareader and db_datawriter roles and having no additional fine-tuning of its security settings. The code block performs four tasks. It updates the name column value in the TrackPersons table for the row with a tpid column value of 3. It deletes the row with a tpid column value of 4. It displays the contents of the modified version of the TrackPersons table. It restores the execution context of the login that invoked the initial EXECUTE AS statement in the code block. The same block of code is rerun two additional times by the script within PermissionsAndRoles.sql. Before each rerun, there is some fine-tuning of the security settings for the cab233a\winlogin1 user with GRANT, DENY, or REVOKE statements. EXECUTE AS login = 'cab233a\winlogin1' UPDATE TrackPersons SET name = 'Name changed' WHERE tpid = 3 DELETE FROM TrackPersons WHERE tpid = 4 GO SELECT * FROM TrackPersons GO REVERT GO
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CHAPTER 8 MANAGING SQL SERVER EXPRESS SECURITY
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The following listing shows the result set from the SELECT statement in the preceding code block. Notice that both the UPDATE and DELETE statements in the code block succeeded. This is because the name column value for the row with a tpid value of 3 changed from Name to change to Name changed. In addition, there is no fourth row because it was deleted by the DELETE statement in the block. This output confirms the success of both data modification statements within the code block whereas the cab233a\winlogin1 user is a member of the db_datareader and db_datawriter fixed database roles with no fine-tuning. tpid ----------1 2 3 name --------------Rick Dobosn Virginia Dobson Name changed
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The next couple of lines of code in PermissionsAndRoles.sql are shown next. These lines restore the initial values in the TrackPersons table and invoke a DENY statement. A DENY statement operates similarly to a GRANT statement in that it enforces a rule about the operation of a permission for an object by a principal. In the case of the following DENY statement, the rule is that UPDATE statements are not allowed for the TrackPersons table. The DENY statement instructs SSE to enforce this rule for the cab233a\winlogin1 user. The DENY statement overrides the UPDATE permission granted by the membership of the cab233a\winlogin1 user in the db_datawriter role. A denied permission always overrides a granted permission. EXEC RestoreTrackPersons DENY UPDATE ON TrackPersons TO [cab233a\winlogin1] The output for the preceding EXECUTE AS code block with the UPDATE and DELETE statement is shown next. The result set below is for a fine-tuned set of permissions that enforces a rule against changes to column values in the TrackPersons table by the cab233a\winlogin1 user. Therefore, the UPDATE statement from the code block does not succeed, but the DELETE statement does. As a consequence, the name column value for the row with a tpid column value of 3 is the same as its initial value. However, the fourth row is missing because the DELETE statement was successful. tpid ----------1 2 3 name --------------Rick Dobosn Virginia Dobson Name to change
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The next three statements show the operations that take place before the second rerunning of the previous EXECUTE AS code block. The first statement restores the initial column values for the TrackPersons table. The second statement removes the rule denying updates to TrackPersons column values by the cab233a\winlogin1 user. The removal of this rule allows the underlying permission to update TrackPersons column values by the cab233a\winlogin1 user membership in the db_datawriter role to operate.
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