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Listing 41 A pair of cooperating before filters class BankController < ActionController::Base before_filter :audit protected def audit # record this controller's actions and parameters in an audit log end end

The default rule set provided with a good static analysis engine should unconditionally ag functions such as the ones in Table 66 as potentially dangerous Although these unconditional warnings do not require complex analysis capabilities, the presence of calls to these functions suggest that the code was written by someone who was not overly concerned about security

class VaultController < BankController before_filter :verify_credentials protected def verify_credentials # make sure the user is allowed into the vault end end

Because composites are just a particular type of component, they can also be reused like other components Composites can have services, references, and properties that are con gured in their parent composite

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Any actions performed on BankController (or any of its subclasses) will cause the audit method to be called before the requested action is executed On the VaultController, first the audit method is called, followed by verify_credentials, because that s the order in which the filters were specified (Filters are executed in the class context where they re declared, and the BankController has to be loaded before VaultController, since it s the parent class) If the audit method happens to call render or redirect_to for whatever reason, verify_credentials and the requested action are never called This is called halting the filter chain

Common Pitfalls with Bounded Functions Bounded string functions are safer than unbounded functions, but there s still plenty of room for error This section covers the following common pitfalls programmers encounter with bounded string functions: The destination buffer over ows because the bound depends on the size of the source data rather than the size of the destination buffer The destination buffer is left without a null terminator, often as a result of an off-by-one error

A filter can take one of three forms: method reference (symbol), external class, or block The first is by far the most common and works by referencing a protected method somewhere in the inheritance hierarchy of the controller In the bank example in Listing 21, both BankController and VaultController use this form

Filter Classes Using an external class makes for more easily reused generic filters, such as output compression External filter classes are implemented by having a static filter method on any class and then passing this class to the filter method, as in Listing 42 The name of the class method should match the type of filter desired (eg, before, after, around)

Listing 42 An output compression filter class OutputCompressionFilter def selfafter(controller) controllerresponsebody = compress(controllerresponsebody) end end

The destination buffer over ows because its bound is speci ed as the total size of the buffer rather than the space remaining The program writes to an arbitrary location in memory because the destination buffer is not null-terminated and the function begins writing at the location of the rst null character in the destination buffer We rst propose guidelines for avoiding these pitfalls with two of the most often misused bounded string-manipulation functions: strncpy() and strncat() Then we address the broader topic of truncation errors, which can occur even when bounded functions are used correctly

The method of the Filter class is passed the controller instance it is filtering It gets full access to the controller and can manipulate it as it sees fit The fact that it gets an instance of the controller to play with also makes it seem like feature envy, and frankly, I haven t had much use for this technique

Because composites are just a particular type of component, they can also be reused like other components As we explain in the next sections, composites can have services, references, and properties that are con gured in their parent composite We now look at how to use a composite as a component implementation

Inline Method The inline method (using a block parameter to the filter method) can be used to quickly do something small that doesn t require a lot of explanation or just as a quick test

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class WeblogController < ActionController::Base before_filter do redirect_to new_user_session_path unless authenticated end end

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