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metadata: a meta-attribute, if you will. We have provided the AttributeUsage attribute constructor with two arguments. The first is a set of flags that indicate the target in this case, the class and its constructor, fields, methods, and properties. The second argument is a flag that indicates whether a given element might receive more than one such attribute. In this example, AllowMultiple is set to true, indicating that class members can have more than one BugFixAttribute assigned.

The new custom attribute in this example is named BugFixAttribute. The convention is to append the word Attribute to your attribute name. The compiler recognizes this convention, by allowing you to use a shorter version of the name when you apply the attribute. Thus, you can write:

8. A database view can be thought of as a virtual database table that contains the columns and rows of the result set of a predefined query. For instance, the database of the pizza delivery application might contain a view of the creditcards table that contains only the columns for the card holder and expiry date, but not the card number. 9. Of course, encryption can also mitigate other risks, such as data being disclosed when a disk drive or entire server is stolen.

[BugFix(123, "Jesse Liberty", "01/01/08", Comment="Off by one")]

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The compiler will first look for an attribute class named BugFix and, if it doesn t find that, will then look for BugFixAttribute.

Although attributes have constructors, the syntax we use when applying an attribute is not quite the same as that for a normal constructor. We can provide two types of argument: positional and named. In the BugFix example, the programmer s name, the bug ID, and the date are positional parameters, and comment is a named parameter. Positional parameters are passed in through the constructor, and must be passed in the order declared in the constructor:

public BugFixAttribute(int bugID, string programmer, string date) { this.BugID = bugID; this.Programmer = programmer; this.Date = date; }

The generated code is an HTML IFRAME element. This block of code (see Listing 6-1) can be copied and pasted into the HTML BODY element of your web page.

Named parameters are implemented as fields or as properties:

Designing and implementing an encryption scheme correctly is not a trivial task; Part 3 of this book is dedicated to the discussion of issues surrounding cryptography and its correct use. For example, you have to carefully consider key management. In particular, it is clear that storing the key in a configuration data table in the database would be a bad idea the attacker could exploit the same SQL vulnerability to extract both the encrypted data and the key that was used to encrypt it. Some databases support a feature in which certain columns of a table can be configured to be automatically encrypted whenever data is written to the table, and decrypted when it is read from the table. This has the advantage that programmers can code database access as if no encryption were taking place the database transparently provides this function and also takes care of key management. Unfortunately, this approach does generally not help mitigate SQL injection vulnerabilities. Since the data is returned from SQL queries in already decrypted form, this applies to data returned by injected queries as well. For example, if the pizza delivery site had used transparent database encryption to encrypt the data in the creditcards table, the UNION SELECT would still have succeeded in extracting plain-text credit card numbers, since the database would have automatically decrypted the data retrieved by the injected SELECT FROM creditcards statement.

public string Comment { get; set; }

You may be wondering why attributes use a different syntax for named arguments than we use in normal method and constructor invocation, where named arguments take the form Comment: "Off by one", using a colon instead of an equals sign. The inconsistency is for historical reasons. Attributes have always supported positional and named arguments, but methods and normal constructor calls only got them in C# 4.0. The mechanisms work quite differently the C# 4.0 named argument syntax is mainly there to support optional arguments, and it only deals with real method arguments, whereas with attributes, named arguments are not arguments at all they are really properties in disguise.

It is common to create read-only properties for the positional parameters:

public int BugID { get; private set; }

Some databases have dangerous functionality that is enabled by default. For example, a version of Microsoft SQL Server provides SQL commands that allows users to open inbound and outbound network connections. Cesar Cerrudo s Manipulating Microsoft SQL Server Using SQL Injection shows how such functionality can be used by an attacker to copy data to an attacker s database server, upload arbitrary binaries to the victim system for execution, port scan the victim s internal network, and much, much more. To prevent an attacker from having a field day with any extra functionality provided by your database, you should clearly review your database configuration and disable all such functionality by default. In addition, hardening guidelines for the operating system that the database is running on should be followed; for instance, unused services and accounts should be disabled (there is usually no need for a web server to be running on the database host).

If you create a console application for this code, you ll see output like this when it runs:

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