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FIGURE 15-6 Using the GRANT OPTION
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GRANT WITH GRANT OPTION
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Alternatively, Larry might construct a view for Sue including only the salespeople in the Los Angeles office and give her access to that view:
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CREATE VIEW SELECT FROM WHERE LAREPS AS * WESTREPS REP_OFFICE = 21;
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GRANT ALL PRIVILEGES ON LAREPS TO SUE;
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Larry is the owner of the LAREPS view, but he does not own the WESTREPS view from which this new view is derived. To maintain effective security, the DBMS requires that Larry not only have the SELECT privilege on WESTREPS, but also requires that he have the GRANT OPTION for that privilege before allowing him to grant the SELECT privilege on LAREPS to Sue. Once a user has been granted certain privileges with the GRANT OPTION, that user may grant those privileges and the GRANT OPTION to other users. Those other users can, in turn, continue to grant both the privileges and the GRANT OPTION. For this reason, you should use great care when giving other users the GRANT OPTION. Note that the GRANT OPTION applies only to the specific privileges named in the GRANT statement. If you want to grant certain privileges with the GRANT OPTION and grant other privileges without it, you must use two separate GRANT statements, as in this example: Let Larry Fitch retrieve, insert, update, and delete data from the WESTREPS table, and let him grant retrieval permission to other users.
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GRANT ON TO WITH SELECT WESTREPS LARRY GRANT OPTION;
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GRANT INSERT, DELETE, UPDATE ON WESTREPS TO LARRY;
15:
SQL Security
Revoking Privileges (REVOKE)
In most SQL-based databases, the privileges that you have granted with the GRANT statement can be taken away with the REVOKE statement, shown in Figure 15-7. The REVOKE statement has a structure that closely parallels the GRANT statement, specifying a specific set of privileges to be taken away, for a specific database object, from one or more user-ids. A REVOKE statement may take away all or some of the privileges that you previously granted to a user-id. For example, consider this statement sequence: Grant and then revoke some SALESREPS table privileges.
GRANT SELECT, INSERT, UPDATE ON SALESREPS TO ARUSER, OPUSER; REVOKE INSERT, UPDATE ON SALESREPS FROM OPUSER;
The INSERT and UPDATE privileges on the SALESREPS table are first given to the two users and then revoked from one of them. However, the SELECT privilege remains for both user-ids. Some other examples of the REVOKE statement are shown next.
PART IV
object-type object-name
FIGURE 15-7
The REVOKE statement syntax diagram
Part IV:
Database Structure
Take away all privileges granted earlier on the OFFICES table.
REVOKE ALL PRIVILEGES ON OFFICES FROM ARUSER;
Take away UPDATE and DELETE privileges for two user-ids.
REVOKE UPDATE, DELETE ON OFFICES FROM ARUSER, OPUSER;
Take away all privileges on the OFFICES table that were formerly granted to all users.
REVOKE ALL PRIVILEGES ON OFFICES FROM PUBLIC;
When you issue a REVOKE statement, you can take away only those privileges that you previously granted to another user. That user may also have privileges that were granted by other users; those privileges are not affected by your REVOKE statement. Note specifically that if two different users grant the same privilege on the same object to a user and one of them later revokes the privilege, the second user s grant will still allow the user to access the object. This handling of overlapping grants of privileges is illustrated in the following example sequence. Suppose that Sam Clark, the sales vice president, gives Larry Fitch SELECT privileges for the SALESREPS table and SELECT and UPDATE privileges for the ORDERS table, using the following statements:
GRANT SELECT ON SALESREPS TO LARRY; GRANT SELECT, UPDATE ON ORDERS TO LARRY;
A few days later George Watkins, the marketing vice president, gives Larry the SELECT and DELETE privileges for the ORDERS table and the SELECT privilege for the CUSTOMERS table, using these statements:
GRANT SELECT, DELETE ON ORDERS TO LARRY; GRANT SELECT ON CUSTOMERS TO LARRY;
15:
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