zebra barcode printer c# 12: Securing a Wireless Network in Objective-C

Printer ECC200 in Objective-C 12: Securing a Wireless Network

CHAPTER 12: Securing a Wireless Network
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Figure 12 12. MAC address access controls
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Before clicking Update, make sure to add the computers you want to give access to on the wireless network. To add a computer, click the plus (+) sign at the bottom of the screen. Now type the AirPort ID of the computer that will be accessing the wireless network. If you want to limit which machines can access the wireless network, then you can click the plus (+) sign. As you can see in Figure 12 13, this opens a screen that enables you to enter the MAC address of the AirPort card (or other wireless adapter). If you are using MAC addresses, only the systems listed will be able to join the wireless network. CAUTION: If the computer configuring the MAC filtering is not configured, it will not be able to tap back into the wireless network and will need to use a wired computer for access once you click Update.
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Figure 12 13. Using the MAC address
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AirPort Logging
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The AirPort does not keep logs for an indefinite amount of time. For longer log retention, an OS X Server should be configured with the syslog service option to keep AirPort logs long-term. Syslog is a built-in configurable service of OS X Server. To enable the syslog function of OS X Server, click the Advanced button in the toolbar of the AirPort Utility. Then, click the Logging & SNMP tab (see Figure 12 14), and enter the IP address for the
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CHAPTER 12: Securing a Wireless Network
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syslog OS X Server. Choose the level of alerts that are sent to the server using the Syslog Level drop-down list.
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Figure 12 14. Enabling logging
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NOTE: If a syslog server is not available, you can still click the Logs and Statistics button to review logs. However, the AirPort will erase these log files the next time it loses power or is reset.
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Hiding a Wireless Network
Another good way to protect an Apple wireless network is to hide the SSID of the network, (also known as SSID suppression), which will cause the wireless network not to appear in the list of available networks for users. If fewer people can discover a wireless network, it is less likely to be hijacked and abused. This isn t to say that hiding the SSID makes the network completely undiscoverable. Later in this chapter, we will discuss tools such as KisMAC and iStumbler that will allow those who wardrive to see networks even when the SSID has been suppressed. SSID suppression is a good mechanism for security, but only when used in conjunction with other security measures. To suppress the SSID for your Apple AirPort, click the Wireless tab for your AirPort, and then click the Wireless Options button. This opens a screen similar to Figure 12 15, from which you can select to Create a Closed Network. An AirPort environment with the SSID suppressed is synonymous with a closed network in Apple terminology. NOTE: Wardriving is the act of searching for wireless networks in a moving vehicle using a computer or a PDA to detect and access wireless networks.
CHAPTER 12: Securing a Wireless Network
Figure 12 15. Creating a closed network
Base Station Features in the AirPort Utility
Every Apple computer comes with a utility to manage Apple AirPorts. This means that every Mac on your network has the ability to configure your AirPorts, which can be dangerous. Now imagine if every Apple computer on the Internet were able to configure your AirPort. If you select Allow configuration over Ethernet WAN port (see Figure 12 16), this is exactly what you are allowing. Do not use this feature unless you really must use it. If it is absolutely necessary to allow administration over the Ethernet, make sure to put an administrative password on the AirPort and give the password only to those who absolutely need it.
Figure 12 16. Allowing configuration over the Ethernet WAN port
CHAPTER 12: Securing a Wireless Network
The AirPort Express
From a security perspective, the Apple AirPort Express closely resembles the Apple AirPort. However, there are certain features, such as NAT enabling and Access Control, that cannot be configured on the AirPort Express. One extra security precaution to consider on the AirPort Express is its port dedicated for playing audio. iTunes has a field that can be used to log into an AirPort Express and play audio to the device. To reliably secure the AirPort Express features for playing audio, log into the AirPort Express and click the Music Icon in the toolbar. This opens a screen that allows you to disable AirTunes, which you should do if you are not using this feature. If you are using AirTunes, then create a speaker password using the AirTunes option in AirPort Setup (shown in Figure 12 17), which will then be required by anyone using the AirPort Express to listen to music.
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