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CHAPTER 11: Recipes
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Fortunately, it s fairly simple to manage the FileVault master password without MCX. Just set the master password on one machine, and then copy the following two files to all your managed machines: /Library/Keychains/FileVaultMaster.cer /Library/Keychains/FileVaultMaster.keychain Note that you must do this before creating any mobile accounts on a given machine; adding or changing these files later does not retroactively change the FileVault master password for an account created earlier.
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FileVault for Local Users
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If you are protecting mobile account data on laptops by using FileVault, it makes sense to extend that protection to purely local accounts. Rather than making it an organizational policy to be sure to turn on FileVault for all local accounts on laptops, you want to use the managed preferences system to make it automatic, just like for mobile accounts. Unfortunately, Workgroup Manager provides no obvious way to enforce this particular preference. But don t worry----you can manage this by importing preferences from the System Preferences application. You ll need to use the Details view in the Preferences editor in Workgroup Manager to directly manage specific preferences. This preference makes sense only at the computer or computer group level (since you are managing a setting relevant to the computer as a whole, and not a particular user). Choose a computer or computer group to manage, click the Preferences icon in the toolbar, and then select the Details pane. Click the + button to add a new preference domain. Navigate to /Applications and double-click the System Preferences app. The results should look something like Figure 11-15.
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CHAPTER 11: Recipes
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Figure 11-15. Preferences imported for com.apple.systempreferences
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Double-click the entry for com.apple.systempreferences and delete all the imported keys----you don t want any of them, as none of them are related to managing FileVault. Expand the Always dictionary, and add a new key called com.apple.preferences. accounts.forceFVForNewUsers with a Boolean value of true. Figure 11-16 shows the results.
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CHAPTER 11: Recipes
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Figure 11-16. com.apple.preferences.accounts.forceFVForNewUsers key
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Apply your changes, and log into a computer that is a member of the computer group for which you are managing this preference. Open the Accounts pane in System Preferences and attempt to create a new account. You should see that Turn on FileVault protection is selected and disabled, as in Figure 11-17.
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CHAPTER 11: Recipes
Figure 11-17. Enforced FileVault for new local accounts
Secure Virtual Memory
If you are securing laptop user data with FileVault, you should consider securing the virtual memory swap file. This file contains data temporarily swapped out from RAM, and so could contain user data. Encrypting this file makes it less likely that a thief could find anything of interest. Again, Workgroup Manger does not provide an obvious way to manage this preference, so you ll need to use a technique similar to the one we used to manage FileVault for local accounts. The preference domain is com.apple.virtualMemory, and the preference key is UseEncryptedSwap.
CHAPTER 11: Recipes
Via the command line, it looks like this: dscl /Search mcxread /ComputerGroups/managed_laptops com.apple.virtualMemory Key: UseEncryptedSwap State: always Value: 1 In Workgroup Manager, it looks like Figure 11-18.
Figure 11-18. Managing encrypted virtual memory
Managing iTunes
iTunes is an important part of the Mac experience, at least from Apple s viewpoint. One could argue that it has no place on a business computer, and you may be tempted to remove it from all the computers you manage. With any luck, you and your organization aren t that draconian. So if you leave iTunes on your managed Macs, you may want to manage certain features of iTunes to make it easier to support, or to disable functionality that might be inappropriate for your organization. It s not uncommon for organizations to disable shared music, or block access to the iTunes Store, to prevent users from buying and downloading music onto company-owned computers. If your organization has usage policies that apply to applications like iTunes, you might want to manage at least some iTunes preferences.
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