zen barcode c# example Granting Administrative Privileges in Objective-C

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Granting Administrative Privileges
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As noted earlier, you can choose to make a user an administrator of the local computer when you create an account. To elevate an existing account to an administrative account, you can simply check the Allow user to administer this computer checkbox, as shown in Figure 1-2. To set up basic policies for an account, you can click on the Open Parental Controls button for any non-administrator account and enable them. (We will cover more in-depth policies on local and network directory services accounts further in 7, Client Management.)
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CHAPTER 1: Directory Services
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Figure 1-2. Making a user an administrator
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As mentioned previously, you can also edit some slightly more advanced settings from within the Accounts System Preference pane. These settings are accessible by controlclicking on the account name and then clicking on Advanced Options, which brings up a screen similar to the one in Figure 1-3. This screen lets you change the values for various attributes of the accounts, including Short Name, User ID, default group, path to the home folder, default shell and the generated ID for the account. You can also add aliases using the plus sign; this allows the same account to authenticate using multiple names in the authentication dialogs throughout the operating system. We will discuss these attributes later in the chapter.
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CHAPTER 1: Directory Services
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Figure 1-3. Advanced account options
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The Root Account
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In a Unix, BSD, or other *nix environments, the root account can do things that even standard administrators typically can t do. A root account can be a security risk, which is why Apple has disabled root by default, but it is an account you may find you need to enable from time to time. If you are new to administering Mac OS X from the command line, you may wish to enable the root account for certain GUI operations that would otherwise use the command line, such as renaming a home folder or editing a configuration file owned by root. To enable the root account, open the Directory Utility application found on the Accounts pane of System Preferences (version 10.6), or in the /Applications/Utilities folder (version 10.5). As with most secure operations in Mac OS X, you will need to authenticate to perform this action using the lock in the corner of this window. Then click on the Edit menu and select Enable Root User, which will display the screen shown in Figure 1-4. Next, enter the password that will be assigned to the root user and click on OK.
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CHAPTER 1: Directory Services
Figure 1-4. Enabling Root in Directory Utility
You can also enable the root account using the command line. The dsenableroot command can be used to enable the root user and assign it a password. To enable root, enter:
dsenableroot
First you will be prompted for the current user password; this user must be an administrative account. You will then be prompted twice, first for a password to assign the root account and then to verify the password. On success you ll see the following success code:
dsenableroot:: ***Successfully enabled root user.
To disable the root account, enter:
dsenableroot d
TIP: It is best to leave the root account disabled when you do not need it. If you do enable it, do so only temporarily.
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CHAPTER 1: Directory Services
How the Local Directory Service Works
The local directory data resides primarily in the folder found at /private/var/db/dslocal. This folder, which will require elevated privileges to access, contains numerous files pertaining to the computer s directory service configuration. For instance, accounts for Users and Groups are stored in flat property list (.plist) files nested in the /private/ var/db/dslocal/nodes/Default directory. Users are stored in /private/var/db/dslocal/ nodes/Default/users while groups are stored in /private/var/db/dslocal/nodes/Default/ groups. Every local user and group account has a corresponding .plist file found in these directories, as seen in Figure 1-5, which shows the contents of /private/var/db/dslocal/ nodes/Default/.
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