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Administrators
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The administrative user should be logged in only when administrative tasks (changing passwords, configuring network settings, and so on) are necessary, not for everyday work. This is a key component of Unix system administration and a good way to keep users from accidentally harming the system. Limit the administrative access to the machine only to the users who absolutely need it (this includes your own account if you use the machine regularly). To remove administrative access for a user, click on the Login Options button in the Accounts pane and click on the user for whom you d like to change access. Uncheck the box Allow user to administer this computer. (See Figure 1 5.)
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Figure 1 5. User Settings
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Fast User Switching is a convenient way to allow a user to log in to multiple accounts concurrently. It poses a security risk, however, because it is possible to access or alter processes (and files not in the user s home directory) run by other users. Fast User Switching should only be used for specific reasons, such as testing different versions of software. As a security precaution, it should not be left running unattended. Another way to safeguard against abuse is to limit administrative access to those who absolutely need it. Better yet, if Fast User Switching is a feature you are not likely to use, disable it by unchecking the Show fast user switching menu option (see Figure 1 4).
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CHAPTER 1: Security Quick-Start
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Security Preferences
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Another place to change the default settings to make the machine more secure is in the Security preference panel (see Figure 1 6). Here, you will find options for enabling many of the miscellaneous security features that Apple has developed, as well as disabling some less secure features. This panel has become the default place to look for security features that don t fit into any specific section of System Preferences.
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Figure 1 6. Security preference pane, General tab
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General
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Under the General tab, the first and most important of these options is the Disable automatic login option. Automatic login, which will remember your password and automatically log you in, is enabled by default. While this may sound incredibly convenient, it really should be disabled. Anyone with physical access to your computer would be able to restart the computer and, if the password is remembered, not be required to enter a password in order to get access to your files. With automatic login enabled, few security measures will stop someone from accessing your files if your Mac were to fall into the wrong hands. Also under the General tab is the option to Require a password [time interval] after sleep or screen saver begins. This will require that a password be used to wake the computer after it has gone to sleep or after the screen saver has been activated. This is absolutely critical and is not enabled by default. You can also specify a time when the
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CHAPTER 1: Security Quick-Start
password can be required after the machine has woken up. We cannot overstress the importance of enabling this option and specifying that the machine require a password immediately. Using the Expos application to assign a key or hot corner (moving the cursor to a corner of the screen to activate the display) to put a system to sleep allows you to put your machine to sleep when you are finished using it. Later in this chapter we will review setting up automatic sleep, Expos , and screen saver options. The option Log out after [number] minutes of inactivity will automatically log users out whenever they are left inactive for a period of time. This setting is useful for machines that are used by multiple users in public locations, such as schools or libraries, where users can sometimes forget to log themselves out. Selecting to Require a password to unlock each System Preferences pane is certainly a way to further secure your machine. If you rarely find yourself in the System Preferences pane, this is probably one to check. If you find yourself frequently changing system preferences, you should probably uncheck this one, as it might pose more of an inconvenience than a help. You should also disable location services, unless you are absolutely sure that you will need them. Location services allows your Mac to be tracked in its time and place in the world. If someone were to gain access to the machine, through spyware or other means, they d be able to determine where the machine physically is. NOTE: It s worth mentioning that half of the authors of this book use this feature and the other half do not. This is an example of usability vs. security. Virtual memory is a means of using hard drive space as temporary memory in order to allow the computer to perform more work than the computer has available memory for. Virtual memory creates virtual chunks of memory in files called swap files on your hard drive. When this transitory memory is no longer needed, the swap files are deleted (which doesn t always happen immediately). Valuable information can be gleaned from a system by viewing the virtual memory swap files and reconstructing user operations. The option to secure virtual memory encrypts the swap files, preventing others from using them to gather private data. This is an important feature to enable. Apple is now shipping infrared remote controls with many of its new computers, including MacBooks, MacBook Pros, and iMacs. As of this book s publication, there is little that can be done to damage systems with the infrared remote controls; however, theoretically it does allow someone to walk by the machine and launch menu options by use of a remote, which can be rather annoying. (If you do not have an infrared receiver, then you will not have this option in your Security Preferences.) Once the technology is more thoroughly utilized, there is also the theoretical chance that it could be used to exploit the system. This is a concern, thanks to the release of the wifi exploit at DefCon 2006 by David Maynor, which we cover further in 12. Noticing this as a possibility, Apple introduced the ability to enable and disable the remote control infrared receiver in the Security preferences General tab. To turn off the ability to use an infrared receiver, click the Security pane in System Preferences, and
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