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sudo cp -prnv /var/db/dslocal/nodes/Default /var/db/dslocal/nodes/NEW
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When it is started, the DirectoryService daemon will look in the nodes directory for any newly created nodes, which we want it to do. Let s restart the daemon with the following:
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sudo killall DirectoryService
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Now go ahead and open up Directory Utility.app (as described previously in this chapter) and click on the Search Policy tab. Authenticate using the lock in the lower left-hand corner of the screen, and then change the Search: field to Custom path.
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External Accounts
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External Accounts are similar to Mobile Accounts (which we will cover in more depth in 16). With an external account, you can store the user profile, password, and account information on removable media, making it portable across computers without a network. To do this, we re going to do some crafty manipulation of the createmobileaccount command located in the /System/Library/Coreservices/ManagedClient.app/Contents/Resources directory. This command is normally used when a Mobile Account logs into the computer. Rather than let the operating system decide whether it wants to invoke the createmobileaccount dialog at the loginwindow, we re going to force it to manually run it now. The -n, -p, and -h flags define the username, password, and home directory of the account. Assuming your USB drive is called JUMPDRIVE, the following will set up your external account on
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CHAPTER 3: Securing User Accounts
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the removable media (by the way, this is not in your default path, which means you must always type the full path to the command or modify your shell preferences to make it your default path):
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./createmobileaccount -n mobileadmin -p MYSECRETPASSWORD -h /Volumes/JUMPDRIVE/Users/mobileadmin
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That s about all there is to it. If we wanted to, we could also enable FileVault by using the -e flag and/or run the command verbosely (great for troubleshooting issues during account creation) by using the -v flag. Next, use ls -al to verify that your new external account can write to the volume.
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Restricting Access with the Command Line: sudoers
By editing the sudoers file, you can take a much more granular approach to securing users access to resources. Sudo stands for su do, and su stands for substitute user. sudo is a command-line utility in Unix, Linux, and Mac OS X that allows users to run programs as though they were another, more powerful user. By default, sudo will run as a system s superuser, or root account (although this can be changed using the runas_default setting in the sudoers file). The syntax sudo will run one command as another user. The syntax su will run all commands that follow it as the administrative user who is invoked. su and sudo are useful tools, but they are also very powerful and can be used to accomplish almost anything once invoked, so take precautions. You should use su and sudo in as limited a fashion as possible. In fact, you should use su with even more caution than sudo, because it maintains the elevated permissions for the duration of a Terminal session, and its use is generally not recommended. NOTE: Sudo keeps a record of every command executed through it, while su (and sudo -s, sudo /bin/sh etc.) let users evade auditing once they have elevated. As stated earlier, by default the root, or superuser, account is disabled in Mac OS X, but can be enabled using Directory Utility. In Mac OS X Server (as opposed to Client), the root account is enabled by default, and automatically is given the password of the first administrative user who is created during installation (more about root access in Mac OS X Server in 16). NOTE: By default, any administrative user can use the sudo command. The sudoers file is located at /private/etc/sudoers. Editing the sudoers file is a direct way to add or remove the ability for users and groups to run certain commands and perform certain tasks from the system without having to use the GUI. Before editing the sudoers file, you should always back up the file. The following code is the default content of the sudoers file on a system (the lines that start with # are inactive):
# sudoers file. #
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