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Domain Name System (DNS) allows you to assign host names to corresponding IP addresses so you can easily track and interconnect devices and services by their host name These tools are essential for most networks to ease the burden of management, and although they are standards-based aspects of network management, their Mac OS X Server specific implementation is covered in 6..

One of the problems with this method is that you lose some of the benefits of cached query plan execution SQL Server 2008 has some great features that can help in this area, including parameter sniffing and the ability to turn on forced parameterization, but there are many exceptions to SQL Server s ability to automatically parameterize queries or clauses To guarantee efficient reuse of cached query execution plans as the text of your query changes, you should parameterize queries yourself But the big problem here is SQL injection Although not really a problem when appending an integer value to the end of a dynamic query (as in Listing 18-8), SQL injection can provide a back door for hackers trying to access or destroy your data when you concatenate strings to create dynamic SQL queries Take a look at the innocent-looking dynamic SQL query in Listing 18-9.

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I will discuss how a hacker could wreak havoc with this query after the listing Listing 18-9 Basic Dynamic SQL Query with a String Appended DECLARE @product_name nvarchar(50) = N'Mountain'; DECLARE @sql_stmt NVARCHAR(128) = N'SELECT ProductID, Name ' + N'FROM ProductionProduct ' + N'WHERE Name LIKE ''' + @product_name + N'%'''; EXECUTE (@sql_stmt); This query simply returns all product IDs and names of all products that begin with the word Mountain The problem is with how SQL Server interprets the concatenated string The EXECUTE statement sees the following concatenated string (the bold portion reflects the value of the variable that was concatenated into the query) SELECT ProductID, Name FROM ProductionProduct WHERE Name LIKE 'Mountain%' A simple substitution for @product_name can execute other unwanted statements on your server This is especially true with data coming from an external source (eg, from the front end or application layer).

once you ve exported it. Otherwise, anyone who can gain administrative access to the workstation can circumvent the encryption process.

NOTE: This is a good time to go over the difference between authentication and authorization Authentication is the process where you prove who you are Entering a username and password at a prompt, swiping a key card to gain access to a room, inserting your ATM card, and entering a PIN are all examples of authentication You re proving you are who you say you are Authorization happens afterward and determines what you can do after you authenticate yourself If you have proper authorization, then once you have properly authenticated yourself, you can get access to shares on a server, the room door unlocks, and you can access your bank account If you are not authorized to do those things, then they will still fail, even though you properly authenticated yourself.

Consider the following change to Listing 18-9: DECLARE @product_name nvarchar(50) = N'''; DROP TABLE ProductionProduct; --' The EXECUTE statement now executes the following string (again, the portion provided by the variable is shown in bold): SELECT ProductID, Name FROM ProductionProduct WHERE Name LIKE ''; DROP TABLE ProductionProduct; --%' The simple dynamic SQL query is now two queries, the second of which will drop the ProductionProduct table from the database! Now consider if the value of the @product_name variable had been retrieved from a user interface, like a web page A malicious hacker could easily issue arbitrary INSERT, UPDATE, DELETE, DROP TABLE, TRUNCATE TABLE, or other statements to destroy data or open a back door into your system Depending on how secure your server is,.

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