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We will now add handlers for specific keys to this function (in addition to the timer-handling code) Listing 12-45 shows the code we use to handle the Enter key being pressed When the user hits Enter, if a suggestion is highlighted, then we want to populate the search input with this term and submit the form If no term is highlighted, then we submit the form with whatever the user has typed so far When the search term populates the input, we clear the suggestions, just as we did in the mouse-handling code Also, note that we leave the call to clearTimeout() in front of the switch() statement This is because we will be returning from the keys handled in the switch() statement, but we still want to cancel the timer All normal key presses will travel beyond the switch() statement and trigger the new timer Listing 12-45.

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.

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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:

Searching on the Selected Term When the User Hits Enter (SearchSuggestorclassjs) SearchSuggestor = Classcreate(); SearchSuggestorprototype = { // .. other code.

In a similar vein, any file that begins with a dot (.) on Unix servers is probably not intended for user consumption. This includes .htaccess files and user account files such as .cshrc, .login, .history, and .profile. This is the easy way to prevent users seeing these files:

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