Rczne Skanowanie Plikw Client Security For Mac

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Time This lesson takes approximately 30 minutes to complete. Goals Control network traffic Understand the firewall options in Mac OS X and Mac OS X Server Explore the command line and remote configuration of firewalls Security has never been more critical when administrating client and server systems. Today’s external threats range from macro viruses embedded in documents and spreadsheets, to denial of service network attacks.

All networked systems are potentially vulnerable to probes and attacks—intentional and unintentional—as assailants constantly scan systems connected to the Internet. However, attacks can also come from internal sources. In 2008 and 2009, the greatest number of reported data breaches actually came from within corporate networks.

To help administrators protect their systems, this chapter focuses on mitigating and controlling access using Mac OS X firewalls on both the client and server. In this chapter, you’ll learn how to verify when attack attempts and system failures occur, and how to configure firewalls to guard against them. Understanding the Mac OS X Firewall In the days before digital technology, the term firewall described an actual fireproof wall designed to contain fires, such as the barrier between a car’s engine and its passenger section. Like those physical walls, computer firewalls work to prevent improper network packets from “burning through” a host or network perimeter. Today’s digital firewalls consist of hardware or software that blocks unauthorized network access from sources outside or inside your network. Mac OS X has two software firewalls: the IP Firewall ( ipfw) and the Application Firewall.

While ipfw is available in both Mac OS X and Mac OS X Server, Mac OS X Server includes a graphical user interface for detailed configuration, monitoring, and troubleshooting. Mac OS X provides basic, user-oriented service configuration, and optional advanced configuration. Mac OS X Server also includes an Adaptive Firewall, which can add and remove firewall rules based on network events. NOTE Technically, the IP Firewall is now in its second generation, and is sometimes called ipfw2. It consists of both the IPv4 and IPv6 programs for restricting IPv4 packets and IPv6 packets, respectively.

However, it is commonly referred to as ipfw, as it will be in this book. Using the Mac OS X Application Firewall The most common method for securing network services is to configure a firewall at the network perimeter, where the network connects to a remote network such as the Internet. Most networks use a firewall to limit inbound traffic from the Internet or remote connections. In fact, most home and small business routers, such as Apple’s AirPort base stations, are designed with built-in firewall software.

While network-level firewalls will block unauthorized traffic trying to enter your network, they will not block traffic that originated inside your network. Also, if your Mac is mobile and frequently joins new wired or wireless networks, your computer will regularly encounter networks with different firewall rules or, possibly, no firewall protection at all. So secure mobile access is an important consideration in designing your overall firewall policies. To protect against unauthorized network access to your Mac, you can enable the Application Firewall via System Preferences.

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Administrators can utilize command-line tools to enable and configure the firewall. Network-based firewalls use a set of rules that target specific service port numbers, such as TCP port 80, the port used for standard HTTP services. However, certain network services—such as iChatAgent (the background process that receives incoming connections for iChat)—use a wide range of dynamically assigned ports.

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These dynamic multiport services use more than one port to transfer multiple data types. For example, iChat can transmit audio, video, screen sharing, and text all at one time, which requires a multiport approach. This typically causes configuration complications with network-based firewalls because numerous ports need to be open to allow the service to function. As a solution to this issue, Mac OS X’s Application Firewall allows connections based on application and service needs without requiring the user or administrator to know the myriad ports these apps and services may use. For example, you can authorize iChatAgent to allow incoming connections without manually configuring ports or port ranges. The Application Firewall in Mac OS X version 10.6 includes a new feature that enables administrators to allow signed software to receive incoming connections automatically. Applications that have been digitally signed by their authors can accept inbound network connections without further configuration from the user or administrator, simplifying administration of deployed systems.

Digitally signing an application provides reassurance that the application has not been tampered with. Its adaptive nature means the Application Firewall will open necessary ports only when an application is running. This prevents several types of known attacks on personal systems. Configuring the Mac OS X Application Firewall To enable and configure the Max OS X firewall using System Preferences, here’s what you do:. Open iChat by clicking its icon in the Dock. Choose Apple menu System Preferences and then click the Security icon to open Security preferences.

In the lower-left corner of the security pane, click the lock icon and then authenticate yourself as an administrative user to unlock Sharing preferences. Click the Firewall tab, and then click Start to turn on the Max OS X firewall using its default rules. When the firewall is enabled, the Start button changes to a Stop button and the advanced button is enabled. TIP Firewall logging is always enabled and can be viewed using the Console.

The firewall log is located at /private/var/log/appfirewall.log. To customize the firewall, click Advanced for additional configuration options. You can see which services are currently enabled from the Sharing preferences. Sharing service ports are enabled by default when a service such as Web Sharing is enabled. If you want to exercise more control over the configuration, you can manually set which applications and services the firewall allows by selecting or deselecting the checkbox that automatically allows signed software.

With this firewall choice enabled, when a network-aware application such as iChat opens or requests a network connection, a dialog, such as the one shown in the following figure, asks if you want to allow the application access to the network. This dialog will appear as a warning anytime a network-aware application requests incoming access for the first time.

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