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This isn t a book about Perl regular expressions, but a short explanation is worthwhile. Perl recognizes special codes for categories of characters \w means word character and is equivalent to [A-Za-z_0-9 .], as used in the previous example. The caret at the start of the expression means the start of the line, so this says that the $MAILTO variable must start with one or more word characters, then have an at sign, then have one or more word characters or dots, and then end with a dot followed by one or more word characters. The dollar means the end of line, so this expression will only match a single address, but it ll do it pretty well. Perl s regular expressions are a superset of those understood by Apache. Any regular expression that works in Apache s directives will also work in Perl. Perl s regular expressions are capable of much more, however. Whatever language CGI scripts are written in, the same principles apply; always check variables and insist on wanted characters rather than search for unwanted ones. Even now, you have one problem left. The value of QUERY_STRING may contain URL-encoded characters, causing your match expression to fail; both the at sign and the underscore would be encoded by a browser. You could fix that with a substitution or use CGI.pm and have it done for you. I ll look at this in a little while. So far, I ve demonstrated an insecure CGI script and how to make it secure. However, there are many other potential sources of trouble, so now I ll run through some of the most common.

Any file read by a CGI script can be used as a way to abuse it if an attacker can either persuade the script to read from the wrong file or replace the file with something different. It s a good idea to check the values of filenames passed to a CGI script to prevent users from entering something such as /etc/passwd. Disallowing any character except valid filename characters (for example, no / or .) is a good idea. Restricting the list to known filenames is better still. Any file written or modified by a CGI script is a major cause of concern. A badly written script can be used to overwrite files other than the intended target, such as a Web site s home page. When crackers replace official Web pages on the Internet, this is often how they manage it.

6

Summary

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Users can type anything into a browser form. Be sure to filter as rigorously as possible everything that a script processes, especially if that input is printed back into an HTML document. Consider a guest book script that takes the user s name, e-mail address, and comments and adds them to an HTML page of guest entries. If the user enters something normal, you might get an HTML fragment such as this:

Note: There were many other problems at work here, including the fact that there was information available that should have raised red flags. For example, Mr. Leeson received awards for his trading volume, yet his management did not raise concerns when his own trading volume was a substantial portion of the total volume on the Singapore exchange. There was poor governance on 3 many levels.)

... <li><a href="mailto:troubleshooter@alpha-complex.com">John Smith</a> <br>Comments: Truly friend Computer your site is wondrous and has no security flaws whatsoever! ...

In this chapter, we created a fully functioning search engine for our web application using Zend_Search_Lucene. We achieved this by creating a search index for all of the blog posts in the application. We altered the blog management code so the index is automatically maintained when posts are created, updated, or deleted. Next we added a search form to the website to allow users to find blog posts. The powerful querying syntax of Lucene meant posts could be found based on several criteria, including the title, the body, or its tags. Finally, we improved the search form to behave similarly to Google s Suggest interface. This provides users with some suggestions on what to search for, based on the tags registered users have applied to their blog posts. In the next chapter, we will be looking closely at Google Maps. We will extend the blog functionality so users can add locations to their blog posts and display those maps accordingly.

But an unscrupulous user might add some HTML code using an <img> tag, causing you to run a script off a completely different site:

... <li><a href="mailto:traitor@enemycomplex.com"> Trust Me</a><br>Comments: <img src="http://www.enemycomplex.com/gatherinfo.cgi"> Bwahahaha! ...

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