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Figure 21-4. The apsnet_regsql.exe wizard user interface The wizard provides you with the option of either creating the necessary database or removing the tables from an existing database. If you select the <default> option for the database, it looks for a database called aspnetdb on the server you have specified. If it doesn t exist already, it creates this database and creates the tables in this database. If the tables already exist in the target database, the wizard leaves them as they are. As already mentioned, you can use the aspnet_regsql.exe tool from the command line as well. Actually, that s a good way to automate your application s setup just call this tool from the command line and automatically set up the ASP.NET database tables required by your application. For example, to set up the Membership API database tables, you can execute the following command: aspnet_regsql -S (local) -E -A all -d MyDatabase Figure 21-5 shows the result of executing this command.

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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The problem with that tag is that Jinja, like Django, supports template inheritance, so one template can include content from another If all the loader provides is the content of one template with a simple tag around it, there s no way for Jinja to locate other templates it might reference Just like Django needs a set of template loaders to be configured in your site s settings, Jinja requires an environment be set up, which includes a loader that can locate related templates More specifically, Jinja requires that the template be loaded directly from its environment in order to access the associated template loader And that s where things get trickier We have Django s template loading mechanism that returns just a string, and we have Jinja s template system that needs a full Python object.

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.

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: string ID = txtIDText()Replace("'", "''"); 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..

Another good idea is to restrict the permissions of the account used to access the database so that it Tip doesn t have the right to access other databases or execute extended system stored procedures. However, this can t remove the problem of SQL script injection, because the process you use to connect to the database will almost always require a broader set of privileges than the ones you would allocate to any single user. By restricting the account, you could prevent an attack that deletes a table, for example, but you probably can t prevent an attack that steals someone else s information.

The solution involves two new template tags and a new template loader that bridges the gap..

A parameterized command is simply a command that uses placeholders in the SQL text. The placeholders indicate dynamically supplied values, which are then sent through the Parameters collection of the Command object. For example, this SQL statement: SELECT * FROM Customers WHERE CustomerID = 'ALFKI' would become something like this: SELECT * FROM Customers WHERE CustomerID = @CustID

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