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Confidentiality When dealing with sensitive information, there is little use in establishing identity and authorization if the results of a call will be broadcast to anyone who is interested Con dentiality is the concept of preventing others from reading the information exchanged between a caller and a service This is typically accomplished via encryption, and a variety of mechanisms for this exist within WCF Integrity The nal basic concept of security is the assurance that the contents of a message have not been tampered with during transfer between caller and service, and vice versa This is typically done by digitally signing or generating a signed hash for the contents of the message and having the receiving party validate the signature based on the contents of what it received If the computed value does not match the embedded value, the message should be refused Note that integrity can be provided even when privacy is not necessary It may be acceptable to send information in the clear (unencrypted) as long as the receiver can be assured that it is the original data via digital signature veri cation Transport and Message Security There are two major classi cations of security within WCF; both are related to the security of what is transferred between a service and caller (sometimes called transfer security) The rst concept is of protecting data as it is sent across the network, or on the wire This is known as transport security The other classi cation is called message security and is concerned with the protection that each message provides for itself, regardless of the transportation mechanism used Transport security provides protection for the data sent, without regard to the contents A common approach for this is to use Secure Sockets Layer (SSL) for encrypting and signing the contents of the packets sent over HTTPS There are other transport security options as well, and the choice of options will depend on the particular WCF binding used In fact, you will see that many options in WCF are con gured to be secure by default, such as with TCP.

def __get__(self, instance, owner=None): if instance is None: return self return self__getter(instance)

When a property is accessed we return the result of calling the getter function where we have passed the instance as its rst parameter At rst sight, self__getter() looks like a method call, but it is not In fact, self__getter is an attribute, one that happens to hold an object reference to a method that was passed in So what happens is that rst we retrieve the attribute (self__getter), and then we call it as a function () And because it is called as a function rather than as a method we must pass in the relevant self object explicitly ourselves And in the case of a descriptor the self object (from the class that is using the descriptor) is called instance (since self is the descriptor object) The same applies to the __set__() method

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def __set__(self, instance, value): if self__setter is None: raise AttributeError("'{0}' is read-only"format( self__name__)) return self__setter(instance, value)

One limitation of transport security is that it relies on every step and participant in the network path having consistently con gured security In other words, if a message must travel through an intermediary before reaching its destination, there is no way to ensure that transport security has been enabled for the step after the intermediary (unless that intermediary is fully controlled by the original service provider) If that security is not faithfully reproduced, the data may be compromised downstream In addition, the intermediary itself must be trusted not to alter the message before continuing transfer These considerations are especially important for services available via Internet-based routes, and typically less important for systems exposed and consumed within a corporate intranet Message security focuses on ensuring the integrity and privacy of individual messages, without regard for the network Through mechanisms such as encryption and signing via public and private keys, the message will be protected even if sent over an unprotected transport (such as plain HTTP) The option to use transport and message security is typically speci ed in con guration; two basic examples are shown in Listing 81

Figure 81 MIDP user interface class hierarchy (all classes not shown)

If no setter has been speci ed, we raise an AttributeError; otherwise, we call the setter with the instance and the new value

This method is called when the interpreter reaches, for example, @extensionsetter, with the function it decorates as its setter argument It stores the setter method it has been given (which can now be used in the __set__() method), and returns the setter, since decorators should return the function or method they decorate We have now looked at three quite different uses of descriptors Descriptors are a very powerful and exible feature that can be used to do lots of underthe-hood work while appearing to be simple attributes in their client (owner) class

Just as we can create decorators for functions and methods, we can also create decorators for entire classes Class decorators take a class object (the result of the class statement), and should return a class normally a modi ed version of the class they decorate In this subsection we will study two class decorators to see how they can be implemented

As you progress through this chapter, you ll see scenarios with examples using transport or message security, and in some cases, a mixture of both

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In 6 we created the SortedList custom collection class that aggregated a plain list as the private attribute self__list Eight of the SortedList methods simply passed on their work to the private attribute For example, here are how the SortedListclear() and SortedListpop() methods were implemented:

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