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HTTP tunneling is defined as the process of hiding another protocol inside HTTP messages. This is important because even tightly controlled corporate firewalls are generally open to HTTP traffic. Because the SOAP protocol rides on top of HTTP SOAP requests and responses , can penetrate the firewall as if they were HTTP messages.

Figure 12-2. Ajax suggest drop-down list The rest of the chapter focuses on the code to build this feature using Ajax and Struts. We will build some basic Struts code that performs the same functions as shown in Figure 12-2. It will use the same request-response cycle for Ajax invocation as shown in Figure 12-1.

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A badly written CGI script can create all these security risks, as well as enable all four types of DoS attack. A script that logs excessive information, is processor-hungry, and/or allocates excessive amounts of memory is a potential risk, especially because a determined attacker can start as many instances of the script as Apache allows servers. Apache 2 is harder to tie up this way because threads are far more lightweight than processes, but that doesn t mean you can relax. SSIs can also be insecure. First, any SSI that uses exec cgi or include virtual to run a CGI script introduces all the same security concerns as a CGI script run any other way. Consider that even if the CGI script is never directly referenced by a client, the fact it can be run via an SSI means that it may also be run directly if the client can discover its existence. Second, even an SSI that includes a static piece of content could be caused to reveal information that wasn t intended if the included file isn t protected.

An invaluable source of information on Web server security in general and CGI scripting in particular is the WWW Security FAQ (http://www.w3.org/Security/faq/ www-security-faq.html). It s well worth downloading one of the archived versions and keeping a copy locally for reference, as long as you remember to update it regularly. The CERT Coordination Center (http://www.cert.org/) is another valuable source of current security alerts and background information. It s responsible for issuing security advisories and maintains a large database of known vulnerabilities and their resolutions. Another useful Web site for security information is http://www.securityportal.com/. This contains extensive details of issues and documentation for many platforms and Web technologies, plus links to further information.

An improperly configured Apache can also produce security flaws. The most fundamental isn t running Apache with a specific user and group. On Unix, Apache needs to start as root to be able to bind itself to port 80 (and port 443, if it s providing SSL). In this case, Apache will drop its privileges and assume the user and group specified by the User and Group directives, for example, nobody. If this isn t configured, then all Apache server processes and CGI scripts will run with root privilege. A badly written script could then allow a cracker total access to the server. Running an Apache server with root privileges is simply not acceptable on a server exposed to the Internet and a bad idea even for private use. Subtler configuration problems are harder to spot. For example, editors that save backup files may allow a malicious user to access the source code of a script by adding the backup extension .../script.cgi~ rather than .../script.cgi. It isn t hard to guess a range of common backup extensions, so this is a more serious issue than it might seem. If Apache determines CGI scripts by extension and the backup file is below the document root, then this backup will be treated as plain text by Apache, and a cracker can retrieve the source code. The solution is to prevent access to files with problem extensions with something such as this:

Cities.jsp, shown next, is the JSP file that we will use to invoke the Ajax code to get the list of cities as the user types more characters into a text field: <html> <script language="javascript"> /* * Returns an new XMLHttpRequest object, or false if the browser * doesn't support it */ var availableSelectList; function newXMLHttpRequest() { var xmlreq = false; // Create XMLHttpRequest object in non-Microsoft browsers if (window.XMLHttpRequest) { xmlreq = new XMLHttpRequest(); } else if (window.ActiveXObject) { try { // Try to create XMLHttpRequest in later versions // of Internet Explorer

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