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Look for trust boundaries when you analyze a program In a program that divides validation into a number of layers, use taint propagation to make sure that no layer of validation is bypassed As illustrated in Figure 51, all the input to semantic validation should pass through syntax validation, and all input to the application logic should pass through semantic validation Continues

1024 1024 1024 1024 1024

In the preceding example, assume ServiceImpl takes enough time processing the message that the call to MessagesetBody() in Client is made before the call to Systemoutprintln() in ServiceImpl If the Service interface is marked with @Remotable, ServiceImpl will output: Message is hello However, if the Service interface is not marked with @Remotable, ServiceImpl will output: Message is goodbye In the case where ClientImpl and ServiceImpl are located in processes on different machines, pass-by-value is enforced as the parameters are marshaled from one process to the other (see Figure 36)

Returns the value of self Enables the use of byte calculations and declarations, like 45bytes + 26megabytes

Continued The following two rules provide a taint propagation algorithm enough information to ag the trust boundary violation in Example 57:

Returns self * 1024

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Enables the use of time calculations and declarations, like 45minutes + 2hours + 4years These methods use Time#advance for precise date calculations when using from_now, ago, etc as well as adding or subtracting their results from a Time object For example:

Source rule:

# equivalent to Timenowadvance(:months => 1) 1monthfrom_now # equivalent to Timenowadvance(:years => 2) 2yearsfrom_now # equivalent to Timenowadvance(:months => 4, :years => 5) (4months + 5years)from_now

When both the client and provider are in the same address space, an SCA runtime must also ensure these same semantics Otherwise, the interaction between two components can drastically change based on how they are deployed, leading to unpredictable results In order to ensure consistency and pass-by-value, an SCA runtime will typically copy parameters as a remotable service is invoked (see Figure 37) This ensures that neither the client nor the service provider is accidentally depending on by-reference semantics

While these methods provide precise calculation when used as in the examples above, care should be taken to note that this is not true if the result of months , years , etc is converted before use:

# equivalent to 30daysto_ifrom_now 1monthto_ifrom_now # equivalent to 36525daysto_ffrom_now 1yearto_ffrom_now

Sink rule:

from now(time = Timenow) / since(time = Timenow)

An amount of time in the future, from a specified time (which defaults to Timenow)

Once you've decided what needs to be validated in the context of your program, you must choose a strategy for performing the validation This section discusses various approaches to validation, gives examples of when and how they can be used most effectively, and looks at common inputvalidation pitfalls

Rails mixes quite a few methods into the Object class, meaning they are available via every other object at runtime

When a client and provider are colocated in the same process, parameter copying may introduce signi cant overhead

B371 active support/core ext/object/

.

acts like (duck)

A duck-type assistant method For example, Active Support extends Date to define an acts_like_date method, and extends Time to define acts_like_time As a result, we can do xacts like (:time) and xacts like (:date) to do duck-type-safe comparisons, since classes that we want to act like Time simply need to define an acts_like_time method

An object is blank if it s false, empty, or a whitespace string For example, , , nil, [], and {} are blank This simplifies:

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