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Figure 30-2. An example showing explicitly assigned permissions and the permissions implicit for each user through group membership.
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Securing Your Database You can see why a user other than Admin might still have full permissions to all your objects all users are always members of the Users group, which is, by default, granted full permissions to any new object. To check the permissions for any user or group, first open the database in which you want to review permissions. (You can do this for all the sample databases you ve installed on your hard disk except HousingSecured.mdb.) You must either be the owner of the database and of all the objects you want to check or have Administer permission on the database and objects. For this example, open the unsecured Housing.mdb database. Choose Security from the Tools menu, and then choose User and Group Permissions from the submenu. Access opens the dialog box shown in Figure 30-3. (The dialog box initially shows the permissions for the object you selected in the Database window.)
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Figure 30-3. Some of the permissions for the Admin user in the Housing Reservations sample database.
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In the upper portion of the window, in the User/Group Name list, you can see the list either of users or of groups defined in the database. Choose either the List Users or the List Groups option to switch from one list to the other. In the Object Name list, you can see a list of objects. Use the Object Type drop-down list below the list to select the type of objects you want to review. Click the object of interest to see the explicitly defined permissions in the Permissions section in the lower half of the window. If you select Groups and then select the Users group, you can wander around all the objects and see that this group has full permissions for all objects. As you ll learn later, you can select one or more objects to which you have Administer permission and change the permissions for any user or group. Caution
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Do not attempt to change permissions or ownership of any object until you fully understand all the implications of doing so. As you first start to learn about security facilities in Access, it s a good idea to always work in a backup copy of your database. You might end up denying yourself permission and not be able to recover!
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Part 7: After Completing Your Application
Microsoft Office Access 2003 Inside Out If you click the Change Owner tab, you can peruse lists of the various objects and see what ID (either a user or a group) currently owns the object. In an unsecured database, the Admin user owns all the objects. You can select one or more objects, choose a different user or group, and click the Change Owner button to assign a new owner. Never give away ownership of an object unless you fully understand the implications of doing so. You might first want to be sure that you know how to log on as the potential new owner before assigning ownership to that new owner so that you can still control ownership of the object. If you own an object, you can always give ownership away (or back) to another user or group ID.
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Using the Security Wizard
Now that you understand how Access security works, it should be obvious to you that because Access security is transparently open, you have a lot of work to do to actually secure a database. When you install Microsoft Office, the setup program builds your default workgroup from your Windows user and company name information something that anyone who has access to your computer can figure out and duplicate. So, for starters you need a unique workgroup so that it s difficult to reproduce the workgroup ID that gives all members of the Admins group authority to change permissions. Next you need a user ID other than Admin to own your database and all the objects in it. You also need to remove all permissions from the Users group for all objects. To make sure no one can peruse your data and code with a disk-editing utility, you should also encode your database. (You can find the Encode/Decode Database command by choosing Security on the Tools menu.) You could perform all these steps by hand, but fortunately Microsoft has provided a UserLevel Security Wizard to help you out. The Security Wizard performs all the repetitious work involved in the previous steps.
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