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For data validation checks, use triggers only if you can t do the same check using constraints or in your stored procedure. For example, if you need to compare the value found before an update with the new value being inserted, you might use a trigger.
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For this exam, knowing when constraints, AFTER triggers, and INSTEAD OF triggers are executed is important.
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Usually, you manage permissions by applying them to securables using the GRANT, DENY, and REVOKE statements. However, sometimes you might need to verify certain security settings inside a stored procedure. There are several functions available to help you with this. One example is the IS_MEMBER function. It can check whether the current user is a member of a specific database role or Windows group. If you issue the statement SELECT IS_MEMBER('BUILTIN\Administrators'), it will return 1 if the current user is a member of the local Windows Administrators group and 0 if she is not. If the current user is not logged on using Windows authentication, the function will return NULL. There are several functions of this type that you can use. More information about them is available from SQL Server 2005 Books Online under the topic Security Functions (Transact-SQL) at http:// msdn2.microsoft.com/en-us/library/ms186236.aspx.
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Be aware that this function might behave differently depending on whether a user is logged on using Windows or whether he is logged on using SQL Server authentication. Another thing to note is that some of these functions take into account the use of the EXECUTE AS option/ statement.
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If a text is sent directly to SQL Server and then executed, it is potentially at risk for a SQL injection attack. SQL injection attacks occur if someone injects SQL code (such as a DELETE statement or the execution of a stored procedure) into an application or a Web site and the SQL code is then executed. This attack can occur either inside SQL Server when dynamic SQL is used or on the client side if a string containing SQL is created and then sent directly to SQL Server. On the client side, there are some precautions you take to prevent SQL injection attacks:
Always use the most restrictive data type to store user input before sending it to SQL Server. For example, put numbers into numeric variables rather than string variables. Verify the format of strings on the client side prior to sending them to the server. Disallow all characters that are not needed inside the string. If you are using ADO.NET, always use SqlParameter objects to send parameters to both stored procedures and DML statements. Avoid adding parameters to SQL statements using string concatenation. Never show detailed error messages to the user. He or she can use these to decide how to write his or her SQL injection code!
The following examples show inappropriate and appropriate ways to add parameters to SQL statements using ADO.NET. In this inappropriate method for adding parameters, notice that the SqlCommand.Parameters collection is not used:
//C# ... SqlCommand cmd = new SqlCommand(); cmd.CommandText = @"SELECT * FROM ATable WHERE Name = '" + txtName.Text + "';"; ... 'VB ... Dim cmd As SqlCommand = New SqlCommand() cmd.CommandText = "SELECT * FROM ATable " & _ "WHERE Name = '" & txtName.Text & "';" ...
5
Data Integrity and Error Handling in SQL Server 2005
Following is the appropriate method for adding parameters, this time using the SqlCommand.Parameters collection:
//C# ... SqlCommand cmd = new SqlCommand(); cmd.CommandText = "SELECT * FROM ATable WHERE Name = @Name;"; cmd.Parameters.Add("@Name", SqlDbType.NVarChar, 20).Value = txtName.Text; ... 'VB ... Dim cmd As SqlCommand = New SqlCommand() cmd.CommandText = "SELECT * FROM ATable WHERE Name = @Name;" cmd.Parameters.Add("@Name", SqlDbType.NVarChar, 20).Value = txtName.Text ...
Consider the inappropriate way. If someone enters the string " ' ; DELETE ATable; -- into the txtName text box , the SQL statement sent to SQL Server would be as follows:
SELECT * FROM ATable WHERE Name = ' ';DELETE ATable;--';
This code could (depending on foreign keys, triggers, etc.) cause the deletion of all rows in the table ATable. If you used the SqlParameter object, the code sent to SQL Server would look like the following:
SELECT * FROM ATable WHERE Name = ' '';DELETE ATable;--';
Notice the two single quotes (' '). Because ADO.NET automatically replaces one single quote with two, the entire text entered into the text box is used in the WHERE clause instead of forming a new statement. On the SQL Server side, you should take the same precautions as on the client side, but also take the following into account:
Avoid using dynamic SQL (EXECUTE and sp_executesql). If you must use dynamic SQL, use sp_executesql with parameters rather than EXECUTE and string concatenation (basically, the same as with ADO.NET). Consider the use of the EXECUTE AS option for stored procedures to avoid having to give elevated permissions to users who use stored procedures that contain dynamic SQL.
Following are examples of inappropriate as well as appropriate use of dynamic SQL. First, in the example of inappropriate use of Dynamic SQL, notice that all parameters are concatenated into the @SQL variable to define the SELECT statement.
/* @OrderDate, @CustomerType and @IncludeOrders are parameters to this "stored procedure". */
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