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public HashedPasswordTuple(String p, int s) { dHpwd = p; dSalt = s; } /** Constructs a HashedPasswordTuple pair from a line in the password file. */ public HashedPasswordTuple(String line) throws Exception { StringTokenizer st = new StringTokenizer(line, HashedSaltedPasswordFile.DELIMITER_STR); dHpwd = st.nextToken(); // hashed + salted password dSalt = Integer.parseInt(st.nextToken()); // salt } public String getHashedPassword() { return dHpwd; } public int getSalt() { return dSalt; } /** returns a HashedPasswordTuple in string format so that it can be written to the password file. */ public String toString () { return (dHpwd + HashedSaltedPasswordFile.DELIMITER_STR + (""+dSalt)); } } /** This class extends a HashedPasswordFile to support salted, hashed passwords. */ class HashedSaltedPasswordFile extends HashedPasswordFile { /* The load method overrides its parent's, as a salt also needs to be read from each line in the password file. */ public static Hashtable load(String pwdFile) { Hashtable userMap = new Hashtable(); try { FileReader fr = new FileReader(pwdFile); BufferedReader br = new BufferedReader(fr); String line; while ((line = br.readLine()) != null) { int delim = line.indexOf(DELIMITER_STR); String username = line.substring(0,delim); HashedPasswordTuple ur = new HashedPasswordTuple(line.substring(delim+1)); userMap.put(username, ur); } } catch (Exception e) {

public static class StringExtensions { public static string Right(this string s, int length) { int startIndex = s.Length - length; return s.Substring(startIndex); } public static string Right(this string s, int offset, int length) { int startIndex = s.Length - offset; return s.Substring(startIndex, length); } }

By implementing them as extension methods, we can now write code like this:

string myString = "This is the silliest stuff that ere I heard."; string subString = myString.Right(6); string subString2 = myString.Right(6, 5); Console.WriteLine(subString); Console.WriteLine(subString2);

This will produce output like the following:

If an attacker is able to cause the variable query to contain, for example cookies"><script>evil-script;</script> then, after substitution, this will result in the HTML <form ...> <input name="query" value="cookies"><script>evil-script;</script>"> </form> That is, the attacker is able to close the quote and insert a script tag that will be executed by the browser.

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Notice that the Length of the string is the total number of characters in the string much as the length of an array is the total number of entities in the array, not the number of bytes allocated to it (for example).

You can create a new string by composing one or more other strings. Example 10-55 shows one way to do this.

string fragment1 = "To be, "; string fragment2 = "or not to be."; string composedString = fragment1 + fragment2; Console.WriteLine(composedString);

Here, we ve used the + operator to concatenate two strings. The C# compiler turns this into a call to the String class s static method Concat, so Example 10-56 shows the equivalent code.

string composedString2 = String.Concat(fragment1, fragment2); Console.WriteLine(composedString2);

A variation of the attack in the previous section is possible if the attribute s value is not enclosed in quotes in the template Consider a template fragment in which the attribute s value is not enclosed in quotes, for example <img src=%(image_url)s> Suppose the attacker is able to cause the variable image_url to contain http://wwwexamplesiteorg/ onerror=evil-script; After substitution, this will result in the HTML fragment <img src=http://wwwexamplesiteorg/ onerror=evil-script;> Browsers are usually lenient in their parsing of HTML attributes, and assume that an attribute whose value is not enclosed in quotes ends at the first whitespace character or the end of the tag Thus, the preceding HTML will be parsed as an <img> tag with two attributes (ie, the attacker was able to inject an additional attribute) The ability to inject an arbitrary attribute can often be exploited to execute arbitrary script.

Listing 9-2. Calling the Technorati API var apikey = " key="; var callingAPI = "http://api.technorati.com/search"; var apiKey = "[YOUR API KEY]"; //"{{Key:key;http://api.technorati.com/}}"; var reqUrl = callingAPI; reqUrl += apikey + apiKey; reqUrl += "&query=" + search; // can be link or weblog reqUrl += "&format=rss"; // set the returning xml to rss format

Don t forget we re taking the first two strings, and then creating a new string that is fragment1.Length + fragment2.Length characters long. The original strings remain unchanged.

There are several overloads of Concat, all taking various numbers of strings this enables you to concatenate multiple strings in a single step without producing intermediate strings. One of the overloads, used in Example 10-57, can concatenate an entire array of strings.

static void Main(string[] args) { string[] strings = Soliloquize(); string output = String.Concat(strings); Console.WriteLine(output); Console.ReadKey(); } private static string[] Soliloquize() { return new string[] { "To be, or not to be--that is the question:", "Whether 'tis nobler in the mind to suffer", "The slings and arrows of outrageous fortune", "Or to take arms against a sea of troubles", "And by opposing end them." }; }

If we build and run that example, we ll see some output like this:

To be, or not to be--that is the question:Whether 'tis nobler in the mind to suf ferThe slings and arrows of outrageous fortuneOr to take arms against a sea of t roublesAnd by opposing end them.

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