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This will route all of your Internet traffic through the VPN link, securing your wireless traffic. Remember, although it might likely take a hit in performance, slowing things down a bit, your traffic will be encrypted, passed through the tunnel, decrypted, passed out of the client machine, and then passed out onto the Internet. Performance slowdowns are an expected result. The process to disconnect is fairly simple. Use ps ax | grep pppd to search for the PPP daemon s process ID. Then use the sudo kill <Process ID> command to stop the daemon. The server machine s PPP daemon will bring down the link. This allows the client machine s PPP daemon to quit. Upon quitting, the client machine will log the VPN user out of the connection. At this point, the PPP connection will have stopped, both daemons will have quit, and your SSH connection should be disconnected.
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Server Security
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t may look similar, but Mac OS X Server has some very different functionality from OS X Client. So, it naturally follows that you will need to take additional precautions to secure Mac OS X Server. In this chapter, we ll primarily focus on the services that are specific to OS X Server and how to secure them, paying attention to where the best practices shift from Mac OS X Client. A number of services are included with Mac OS X Server. We will focus on security as it pertains to the big ones: directory services, file sharing, web server services, wireless services, user account management, Internet security, and the iChat Server. Because many of the other services are dependent on directory services, we ll start by spending some time on security as it pertains to Open Directory, an innovation in Mac OS X Server that distinguishes it from Mac OS X Client.
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Limiting Access to Services
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A key aspect of Mac OS X Server is the ability to limit which users can access which services. The granularity of controls in Mac OS X Server is far greater than that in Mac OS X. When securing AFP, for example, you can control which share points each user can access. Or if you d rather not make a configuration change that restricts a specific user from mounting a share point, you can also set a control that denies access to certain services for specific users.
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Note Web Objects, Tomcat, and other Java servers need to be configured within the service's security
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settings.
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Service access control lists (SACLs) allow admins to limit access to services to certain users. To configure SACLs, open Server Admin, and click the name of the server. Then click Settings in the toolbar, and click the Access tab. Uncheck the Use Same Settings for All Services box. Next, click each service you want to limit access to, and then select Allow Only Users and Groups, as shown in Figure 13-1. Then, click the plus (+) sign, and drag the users to whom you would like to grant access to the list.
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CHAPTER 13 S ERVER S EC URIT Y
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Figure 13-1. Configuring SACLs
Tip This can be helpful with services such as VPN that do not have their own granular user controls within
the service.
The Root User
Unlike Mac OS X Client, Max OS X Server enables the root user by virtue of a password at first boot. By default, the Server Assistant uses the local administrative user s password (such as admin or mycompany admin) that was entered during the setup screens for the password of the root user. Keep in mind that any subsequent password changes to that first administrative account are not replicated when you change its password. In practice, this often leads to a stale password for root if left enabled; in other words, the password does not have any policies applied to it. This is one strong argument for leaving the root user disabled on Mac OS X Server and enabling it only when it s needed. To disable the root user, use the following command: dsenableroot -d
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