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Before you start checking spelling or grammar, tell Word how much (or how little) help you want in these areas:

11:

checks only those grammatical items you want it to To set spelling and grammar options, follow these steps: 1 Click the Of ce button, and then click the Word Options button Word displays the Word Options dialog box 2 In the left panel, click the Proo ng category Word displays the Proo ng options (see Figure 6-1) These options control four different areas of spell checking and grammar checking You can set spelling options for all Of ce programs, options for correcting spelling and grammar in all Word documents, and even hide spelling or grammar errors in the current document

Although we ve chosen to illustrate HTTP response splitting with an example based on providing direct input to a server application, the way this is exploited in the real world is much like cross-site scripting (XSS) A malicious hacker might send an e-mail containing a link to the vulnerable server, with an injected HTTP response that actually directs the victim to a malicious site, sets a malicious cookie, and/or poisons the victim s Internet cache so that they are taken to a malicious site when they attempt to visit popular Internet sites such as eBay or Google

FIGURE 6-1

As with SQL injection and XSS, the core preventative countermeasure for HTTP response splitting is good, solid input validation on server input As you saw in the preceding examples, the key input to be on the lookout for is encoded CRLFs (that is, %0d%0a) Of course, we never recommend simply looking for such a simple bad input string wily hackers have historically found multiple ways to defeat such simplistic thinking As we ve said frequently throughout this book, constrain, reject, and sanitize is a much more robust approach to input validation Of course, the example we used to describe HTTP response splitting doesn t lend itself easily to constraint (the application in question is essentially a search engine, which should be expected to deal with a wide range of input from users wanting to research a myriad of topics) So, let s move to the reject and sanitize approach, and simply remove percent symbols and angle brackets (%, <, and >) Perhaps we define a way to escape such characters for users who want to use them in a search (although this can be tricky, and it can lead you into more trouble than nonsanitized input in some instances) Here are some Microsoft NET Framework sample code snippets that strip such characters from input using the CleanInput method, which returns a string after stripping out all nonalphanumeric characters except the at symbol (@), a hyphen (-), and a period () First, here s an example in Visual Basic:

Function CleanInput(strIn As String) As String Replace invalid characters with empty strings Return RegexReplace(strIn, "[^\w\@-]", "") End Function

.

3 In the When Correcting Spelling in Of ce Programs area, choose how the spell checker works across all Of ce programs: Word, Excel, PowerPoint, Outlook, Access, Publisher, and any others

And here s an example in C#:

CHAPTER 6:

String CleanInput(string strIn) { // Replace invalid characters with empty strings return RegexReplace(strIn, @"[^\w\@-]", ""); }

(The spell checker still checks words with Small Caps formatting) This setting is useful for excluding acronyms and capitalized technical terms from spelling checks

Another thing to consider for applications with challenging input constraint requirements (such as search engines) is to perform output validation As we noted in our discussion of XSS earlier in this chapter, output encoding should be used anytime input from one user will be displayed to another (even especially! administrative

checker to skip any word that includes one or more digits Names and technical terms such as Portuguese4U or BootLoader2 are the usual offenders Even if your documents contain few such words, ignoring them is usually helpful