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The re nement of techniques for the prompt discovery of error serves as well as any other as a hallmark of what we mean by science J Robert Oppenheimer

>> param = "A" >> Clientwhere("code like ", "#{param}%") => [#<Client id: 1, name: "Amazon, Inc" >]

Under the covers, Rails sanitizes2 your SQL code, provided that you parameterize your query Active Record executes your SQL using the connectionselect_all method, iterating over the resulting array of hashes, and invoking your Active Record s initialize method for each row in the result set What would this section s example look like un-parameterized

his chapter is about static analysis tools: what they are, what they re good for, and what their limitations are Any tool that analyzes code without executing it is performing static analysis For the purpose of detecting security problems, the variety of static analysis tools we are most interested in are the ones that behave a bit like a spell checker; they prevent well-understood varieties of mistakes from going unnoticed Even good spellers use a spell checker because, invariably, spelling mistakes creep in no matter how good a speller you are A spell checker won t catch every slip-up: If you type mute when you mean moot, a spell checker won t help Static analysis tools are the same way A clean run doesn t guarantee that your code is perfect; it merely indicates that it is free of certain kinds of common problems Most practiced and professional writers find a spell checker to be a useful tool Poor writers bene t from using a spell checker too, but the tool does not transform them into excellent writers! The same goes for static analysis: Good programmers can leverage static analysis tools to excellent effect, but bad programmers will still produce bad programs regardless of the tools they use Our focus is on static analysis tools that identify security defects, but we begin by looking at the range of problems that static analysis can help solve Later in the chapter, we look at the fundamental problems that make static analysis difficult from both a theoretical standpoint and a practical standpoint, and explore the trade-offs that tools make to meet their objectives

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>> Clientwhere("code like '#{params[:code]}%'") => [#<Client id: 1, name: "Amazon, Inc" >] # NOOOOO!

Management Domains provide common management facilities for composites deployed to them A domain, for example, is responsible for activating and deactivating components on runtimes as composites are deployed and removed More sophisticated domain infrastructure may provide additional management features, such as access control, monitoring, and troubleshooting

Notice the missing question mark as a variable placeholder Always remember that interpolating user-supplied values into a SQL fragment of any type is very unsafe! Just imagine what would happen to your project if a malicious user called that unsafe find with params[:code] set to

.

"Amazon'; DELETE FROM users;'

This particular example might fail in your own experiments The outcome is very specific to the type of database/driver that you re using Some popular databases drivers may even have features that help to prevent SQL injection I still think it s better to be safe than sorry

Again, you should have a special reason to be using it instead of the more concise alternatives provided by Active Record

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