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Application-layer filtering enables the firewall to inspect the application data in a TCP/ IP packet for unacceptable commands and data. For example, a Simple Mail Transport Protocol (SMTP) filter intercepts network traffic on Port 25 and inspects it to make sure the SMTP commands are authorized before passing the communication to the destination server. An HTTP filter performs the same function on all HTTP packets. Firewalls that are capable of application-layer filtering can stop dangerous code at the edge of the network before it can do any damage.

All this inserting, deleting, and reversing may seem pretty useful, but perhaps some of you are worried about how much processing power it takes to chop and change large runs of data during the course of a program s execution. Because sequences aren t merely simple arrays, the answer is surprisingly little.

25. Switch user to parent_admin. 26. In the Local Security Policy console, double-click User Account Control: Behavior Of The Elevation Prompt For Standard Users. 27. From the drop-down list, select Prompt For Credentials. Click OK. 28. Use the procedures described in this practice to configure and test other UAC settings. 29. Disable the built-in Administrator account (Don_Hall). If you are not sure how to do this, see Practice 2.

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Application-layer filtering can be used to stop attacks from sources such as viruses and worms. To the packet-filtering firewall, most worms look like legitimate network traffic. The headers of the packets are identical in format to those of legitimate traffic. It is the payload that is malicious; only when all the packets are put together can the worm be identified as malicious code, so these exploits often travel straight through to the private network because the firewall allowed what appeared to be legitimate application data.

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An application-layer firewall has become critical in securing a network from attack For years, companies deployed firewalls that provide packet filtering and stateful filtering Many excellent firewalls that provide this level of filtering are available The problem is that these firewalls are so good that attackers no longer bother to attack the firewall at the network layer, but at the application layer, where many of the most serious security breaches have occurred Attacks at the application layer use legitimate application-level protocols and ports To a firewall that performs only packet and stateful filtering, the network packets appear to be normal application data For example, an SMTP message that contains a virus is just an SMTP message with an attachment Or the Web page that downloads a worm to your computer is just a series of HTTP packets.

I hinted briefly in the introduction to sequences of how they re not really arrays. Indeed, I am indebted to Sun engineer Jasper Potts, who pointed out the folly of drawing too close an analogy between JFX sequences and Java arrays and collections. Behind the scenes, sequences use a host of different strategies to form the data you and I actually work with. Sequences are immutable (they cannot be changed; modifications result in new sequence objects), but this does not make them slow or inefficient. When we create a number range, like [0..100] for example, only the bounds of the range are stored, and the nth value is calculated whenever it is accessed. By supporting different composite techniques, a sequence can hold a collection of different types of data represented with different strategies and can add/remove elements within the body of the sequence without wholesale copying. Suffice to say, when we reversed the sequence in listing 2.27 no data was actually rearranged!

The problem is not evident until the application client or server removes the network layer information and starts processing the application data Most organizations that I work with realize the need for an application-layer filter for e-mail and have deployed advanced SMTP filtering servers that can examine the contents of every e-mail message and block messages based on message contents or attachments These organizations have become increasingly aware of the need for the same level of filtering for HTTP packets HTTP has become the protocol of choice for many applications HTTP traffic is allowed through virtually every firewall and every user s computer already has the HTTP client software installed This makes using HTTP very attractive to an attacker.