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This query is prone to injection text input such as Notice the clever use of a closing quotation mark inside the input text It lets a malicious user complete the literal and continue with additional probing to discover more information In this case, I may be able to see the login names of all users whose names start with Robert:
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Although databases and relational data access libraries took a number of steps to mitigate the threat, applications still had to grapple with the trade-off between quick and simple query composition on the one hand and injection-proo ng on the other LINQ to SQL queries are not strings Even when they are translated to SQL, all the user input is treated as SQL parameters The translated queries shown throughout this book show that parameterization is strictly enforced even when literals are used in the LINQ query For example, the following LINQ query and its SQL translation from 8 show the parameterization of Spain:
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This injection elimination is very doable in plain SQL through disciplined use of parameters and appropriate ways to execute SQL But LINQ to SQL makes it easier and automatic You don t have to think about it every time You still have to make sure that you handle connection strings with care in a con guration le or equivalent storage If you do not use integrated security, the connection string likely contains sensitive information such as a database login ID and password Hence, it needs to be secured This need to secure secrets such as passwords is not speci c to LINQ but is still relevant to applications built using LINQ
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16: Introduction to LINQ Patterns and Practice s
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Finally, LINQ components are libraries that are loaded and unloaded as part of the CLR application domain Unlike a server operating system or database server, they are not owners or guardians of persistent data LINQ components by themselves do not have any notion of authentication or access control Hence, data must be secured at the source For example, relational data must be secured through login and least permissive grants for dynamic SQL and stored procedures and functions
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Summary
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This chapter introduced a few key patterns and practices for effectively using LINQ components in an application The patterns span a broad range of LINQ features, from language extensions to libraries, with special emphasis on LINQ s database access components We covered concerns from multiple tiers advantages of dynamic SQL and stored procedures, ensuring correct separation of concerns for the mid-tier of an application, and end-to-end performance and security The abstractions provided by LINQ components are designed to incorporate some of the common patterns and best practices Yet, it is important to understand the considerations for their judicious use The discussion in this chapter was introductory and foundational and meant to be a starting point for more detailed explorations
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to the future, to the ways in which LINQ will be used in the coming years The primary goal is to give you an overview of several alternative LINQ providers not covered in the previous chapters You ve read about LINQ to Objects, LINQ to SQL, and LINQ to XML These technologies shipped with Visual Studio 2008 and C# 30, but they are only a portion of the larger, still-emerging LINQ story The providers covered in this chapter are examples of what LINQ will become in future years LINQ is not just about the existing providers we have studied in this book It is about the potential to create providers for many other data sources Many of the most important tasks performed on computers involve manipulating data In fact, it could be argued that computers are really for working with a disparate set of data sources LINQ is important because it provides a concise, uni ed, integrated way to work with a wide variety of data sources
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