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ASP .NET needs to store all the information of users, roles, and profiles somewhere. By default it stores the data in a SQL Server database. But the whole infrastructure is completely extensible through so-called custom providers. Membership, roles, and profile providers are components that are responsible for storing user, role, and profile information in a data store. While ASP.NET 2.0 ships with a profile for SQL Server, you can create and configure custom providers to store this information anywhere you want. Best of all, the whole API accesses these providers through welldefined interfaces, which means your application can be written completely provider independent. That means changing a provider will not affect your application in any way! You will learn more about custom providers in 26.

More sophisticated attacks are possible For example, the malicious user could simply comment out the rest of your SQL statement by adding two hyphens (--)This attack is specific to SQL Server, but equivalent exploits are possible in MySQL with the hash (#) symbol and in Oracle with the semicolon (;) Or the attacker could use a batch command to execute an arbitrary SQL command With the SQL Server provider, the attacker simply needs to supply a semicolon followed by a new command This exploit allows the user to delete the contents of another table, or even use the SQL Server xp_cmdshell system stored procedure to execute an arbitrary program at the command line.

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Save(); Of course, only privileged users such as website administrators should be allowed to execute the previous code, and the process executing the code must have write access to your webconfig file Also, this sort of code should not be included in the actual web application You should include it in an administration application only You will learn more about hashing passwords in s 25 and 26..

Summary

Here s what the user would need to enter in the text box for a more sophisticated SQL injection attack to delete all the rows in the Customers table: ALFKI'; DELETE * FROM Customers-So, how can you defend against SQL injection attacks You can keep a few good guidelines in mind First, it s a good idea to use the TextBoxMaxLength property to prevent overly long entries if they aren t needed That reduces the chance of a large block of script being pasted in where it doesn t belong In addition, you should restrict the information given by error messages If you catch a database exception, you should report only a generic message like Data source error rather than display the information in the ExceptionMessage property, which may indicate system vulnerabilities More important, you should take care to remove special characters.

New to ASP.NET 2.0 is that the runtime supports cookieless forms authentication out of the box. In ASP .NET 1.x you had to write this functionality on your own. If you don t want the runtime to use cookies, you configure this through the cookieless attribute of the <forms /> tag in the <authentication /> section. <authentication mode="Forms"> <!-- Detailed configuration options --> <forms name="MyCookieName" loginUrl="MyLogin.aspx" cookieless="AutoDetect" /> </authentication> The cookieless option includes the possible settings in Table 20-3. Table 20-3. Cookieless Options in the <forms /> Configuration

With ASP.NET, programmers finally have a comprehensive, full-featured set of security tools. As with many other features in the world of ASP.NET, the presence of a security framework simply means that there is less work for you to do to implement a variety of authentication and authorization scenarios. ASP.NET provides three types of authentication providers, including Windows authentication, forms authentication, and Passport authentication. Additionally, ASP.NET also includes all the necessary interfaces and classes you need to build your own authentication and authorization system. In the following chapters, you ll learn about all of these features.

For example, you can convert all single quotation marks to two quotation marks, thereby ensuring that they won t be confused with the delimiters in your SQL statement: Dim ID As String = txtIDTextReplace("'", "''") Of course, this introduces headaches if your text values really should contain apostrophes It also suffers because some SQL injection attacks are still possible Replacing apostrophes prevents a malicious user from closing a string value prematurely However, if you re building a dynamic SQL statement that includes numeric values, a SQL injection attack just needs a single space This vulnerability is often (and dangerously) ignored An even better approach is to use a parameterized command or a stored procedure that performs its own escaping and is impervious to SQL injection attacks The following sections describe these techniques..

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