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org cannot use a <form> submit to create a POST request to our server-side RPC handler whose contents actually look like valid JSON or XML; and therefore, that our server s handlers are immune from XSRF attacks..

12.3456 01.234560 1.234560

itemNode.getElementsByTagName("enclosure")[0].getAttribute("url") : ""; .getElementsByTagName("enclosure").length>= 1 itemNode.getElementsByTagName("enclosure")[0].getAttribute("type") : ""; var lat = var lon = itemNode.getElementsByTagName("geo:lat"); itemNode.getElementsByTagName("geo:long");

You don t actually have to put all the # symbols you require before the decimal place a single one will suffice; but the placeholders after the decimal point, as shown in Example 10-22, are significant.

double value = 1234.5678; text = value.ToString("#.###"); Console.WriteLine(text);

This produces:

11. You may have noticed that the ampersand in tea & coffee is HTML-encoded as & in the form s input field. This is necessary because & is a metacharacter with special (though different) meanings both in URLs and in HTML. When submitting the form, the browser first HTML decodes the value of the input field, and then URL-encodes it before assembling the POST request.

1234.568

Notice how it is rounding the result in the usual way. The # symbol will never produce a leading or trailing zero. Take a look at Example 10-23.

double value = 0.46; string text = value.ToString("#.###"); Console.WriteLine(text);

The preceding example will produce the following output:

.46

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However, this is not so. The <form> tag has the attribute enctype, which specifies how the browser should encode the form s fields when posting the form (see the HTML 4.01 Specification, Section 17.13.4, for more information) (Raggett, Le Hors, and Jacobs 1999). The enctype attribute specifies the encoding in the form of a MIME media type, also referred to as a content type (Freed and Borenstein 1996).12 The default encoding described previously corresponds to the MIME content type application/x-www-form-urlencoded. A commonly used alternative encoding is multipart/form-data, in which the form data is encoded as a MIME data stream, and which can be more space efficient for large quantities of non-text data for instance, file uploads (Freed and Borenstein 1996). What is not commonly known is that at least some browsers (such as Firefox, as of version 1.5) also support the text/plain encoding, which formats the form data as &-separated key/value pairs, just as application/x-www-form-urlencoded, but does not apply any encoding to the values themselves. For example, the form <form method="POST" action="http://www.mywwwservice.com/action" enctype="text/plain"> <input name='{"junk": "ig' value='nore", "new_password": "evilhax0r"}'> </form> results in a POST request whose body is formatted as {"junk": "ig=nore", "new_password": "evilhax0r"} That is, such a form can indeed be used to make a POST request with essentially arbitrary contents (in particular, well-formed JSON or XML), and can most likely be used to make an XSRF attack request that will be processed as valid by our application (the only constraint is that the request will contain a = character somewhere; there is usually a valid request that satisfies this constraint). As such, we must employ an explicit measure such as the use of action tokens to prevent XSRF against our server-side Ajax handlers.

The comma serves two purposes, depending on where you put it. First, it can introduce a separator for showing digits in groups of three (so you can easily see the thousands, millions, billions, etc.). We get this behavior when we put a comma between a couple of digit placeholders (the placeholders being either # or 0), as Example 10-24 shows.

int value = 12345678; string text = value.ToString("#,#"); Console.WriteLine(text);

if(lat && lat.length == 0) lat = itemNode.getElementsByTagName("lat"); if(lat && lat.length > 0) lat = lat[0].text; if(lon && lon.length == 0) lon = itemNode.getElementsByTagName("long"); if(lon && lon.length > 0) lon = lon[0].text; resultArray[i] = new RSSItem(title, link, description, source, sourceLink, author, tags, comments, commentRss, pubDate, mediaLink, mediaType, lat, lon); } } return resultArray; } } else { return resultArray; } }; // process the xml and create the array. RSSClass.prototype.__formatResponseDataRSSFeed = function (url, resultXML){ if(resultXML.getElementsByTagName("channel").length >= 1) { var errorCheck = resultXML.getElementsByTagName("channel")[0] .getElementsByTagName("description")[0].text; errorLength = errorCheck.indexOf('Error');

Our output string now looks like this:

12,345,678

On the other hand, commas placed just to the left of the decimal point act as a scale on the number. Each comma divides the result by 1,000. Example 10-25 shows two commas, dividing the output by 1,000,000. (It also includes a comma for grouping, although that will not have any effect with this particular value.)

6 Study the source code for the password file classes in Appendix B Note that the code assumes that a particular delimiter is used to segregate the username from the password Construct an attack in which the bad guy can conduct an unauthorized login to a system that uses MiniPasswordManager using a carefully constructed username Assume that the system does not do proper input validation How would you fix the vulnerability 7 Assume that a web server executes the following UNIX mail command in a shell script in response to a new user registering with the web site: mail -s "Welcome $name" $email_address < welcome_lettertxt In the preceding command, the $name and $email_address variables come from an HTML form that the user fills in a Construct an attack in which the attacker can take ownership of the web server machine Assume that the web server is running as root.

int value = 12345678; string text = value.ToString("#,#,,."); Console.WriteLine(text);

This produces:

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