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XML is extensible, meaning you can add your own tags to an XML document. You simply need to follow a few formatting rules described in 1. When SOAP was originally designed, it came with several limitations. Most notably, transporting a binary security context or a transaction context in a SOAP request was not possible because it was a text-based protocol. . However, XML s extensibility made it possible to add new features to SOAP For instance, now a SOAP request can have binary attachments containing security and transaction context. In the future, even more features may be easily added to SOAP because of XML s extensible nature.

package My::Transforming::Filter; use strict; use Apache::Filter; sub handler { my $filter=shift; while ($filter->read(my $buffer, 1024)) { $filter->print(uc($buffer)); } } 1;

In this section we will build an example of a simple Struts application that uses Ajax. This application is similar to the Google Suggest feature, which offers to the user search keywords as they start typing. Think of a City text field in your web application. Imagine how much easier it would be for your users if you could suggest a list of cities as they started typing. For example, if they typed Ba you could show them all the cities that started with Ba, as shown in Figure 12-2, which assumes that the country is India.

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An intermediate solution would be to enable Apache to run an external program once and then maintain a permanent connection to it to filter data repeatedly. mod_ext_filter doesn t support this currently, but you can also use the filter role of FastCGI to implement an external FastCGI application as a filter, which will do exactly this for you. Refer to the FastCGI section later in this chapter for more about that and the mod_perl section in 12 for more about embedded Perl scripting.

Any kind of dynamic content opens whole vistas of potential security problems for the Web server administrator. Even the simplest CGI script can have potential security weaknesses if it s accidentally left world writable. When it comes to security, you can never be too paranoid. I ll discuss the security issues surrounding dynamic content and CGI in particular, list the most common security errors and how to circumvent them, and examine good CGI-writing practices to avoid introducing security holes into scripts. I ll also examine CGI wrappers and how they can help, and sometimes harm, a server s security. To finish , I ll present a short checklist of essential security measures to follow to maintain a secure server. It won t guarantee that the server is secure, but it ll certainly help to avoid the biggest pitfalls. A CGI script is only as secure as the server it runs on, which means the operating system as well as Apache. Accordingly, I ll also dedicate two whole chapters, s 10 and 11, to the wider security issues of administering a public Web server.

Web servers have three basic kinds of security issues to deal with: First, a cracker may try to gain access to the system by exploiting vulnerabilities. CGI scripts are a common source of such vulnerabilities, especially if they aren t run with secure privileges. This is the main kind of security issue that I ll cover in this chapter. Second, a cracker may try to trick the system into divulging information about itself by inducing it to send directory listings and password files that can then be used to attempt access to the system. This is subtler, less obvious to detect, and frighteningly easy to achieve, as you ll see in the following example CGI script. Third, a cracker may launch a Denial of Service (DoS) attack against the server by making rapid successions of requests that cause the server to tie up all its resources trying to process them. This causes the server to be unable to service legitimate requests, and in extreme cases can cause a crash if the server isn t resilient enough to handle extreme resource shortages. CGI scripts make excellent targets for DoS attacks because they re by nature more likely to consume system resources. There are four basic kinds of resource denial a DoS attack may attempt: Tying up all available CPU time Allocating all available memory Filling the disk with data, for example, log information Consuming all available network bandwidth

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