By Ed Pollack
This booklet is an advent and deep-dive into the numerous makes use of of dynamic SQL in Microsoft SQL Server. Dynamic SQL is vital to large-scale looking dependent upon user-entered standards. it is also invaluable in producing value-lists, in dynamic pivoting of knowledge for company intelligence reporting, and for customizing database gadgets and querying their constitution. Executing dynamic SQL is on the middle of purposes similar to enterprise intelligence dashboards that have to be fluid and reply immediately to altering person wishes as these clients discover their information and consider the implications. but dynamic SQL is feared via many as a result of issues over SQL injection assaults. analyzing Dynamic SQL: purposes, functionality, and safeguard is your chance to benefit and grasp a regularly misunderstood function, together with safety and SQL injection. All features of safety suitable to dynamic SQL are mentioned during this publication. you'll research many ways to avoid wasting time and improve code extra successfully, and you'll perform without delay with safeguard eventualities that threaten businesses all over the world each day. Dynamic SQL: purposes, functionality, and protection is helping you deliver the productiveness and user-satisfaction of versatile and responsive functions on your association appropriately and securely. Your organization's elevated skill to answer speedily altering company situations will construct aggressive virtue in an more and more crowded and aggressive international industry.
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Additional resources for Dynamic SQL: Applications, Performance, and Security
Even if friendly errors are displayed, that information would confirm that they have enough access to query the server for information and succeed. Listing 2-16 illustrates some simple examples of the sorts of blind SQL injection queries that might get targeted at a vulnerable server. info CHAPTER 2 ■ PROTECTING AGAINST SQL INJECTION Listing 2-16. password;' EXEC (@sql_command) END TRY BEGIN CATCH SELECT 0 END CATCH; The first three examples use basic yes/no questions in an attempt to learn about the server.
There is no built-in way to manage input or output variables with EXEC. info CHAPTER 1 ■ WHAT IS DYNAMIC SQL? • When using EXEC, it is unlikely that execution plans will be reused. This reuse of execution plans, known as parameter sniffing, is a useful feature and generally something you’ll want to occur. Each of these topics is covered in extensive detail later in this book and can be addressed using the system stored procedure sp_executesql, instead of EXEC. Person'; Whatever TSQL is provided in the string will be executed in the same way as the previous examples.
The limits at this point are restricted only by your imagination. Disable xp_cmdshell on all database servers that could be accessed from outside of your internal network. As an additional safety measure, disable it anywhere that it isn’t absolutely needed! info CHAPTER 2 ■ PROTECTING AGAINST SQL INJECTION In addition to xp_cmdshell, other system stored procedures should have their security limited. xp_regread, xp_regwrite, xp_servicecontrol, xp_loginconfig, sp_addextendedproc, and many others can provide far more access to the server and operating system than you would ever want.