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The GLib main loop is implemented as a number of structures, which allow multiple instances to be run concurrently. GMainContext is used to represent a number of event sources. Each thread has its own context, which can be retrieved with g_main_context_get(). You can also retrieve the default context with g_main_context_get_default().

Another device that one could consider using for storing secrets is a key disk. A USB or key disk is a device that can attach into the USB port on a PC. A key disk has a set of non-volatile memory that can be used to store the bits of a secret or key. The key disk s biggest advantage is that it serves as a second factor. The key itself will not be on the user s PC, and will require the user to plug in the second factor, the USB key disk. However, most of these disks don t have a CPU that can run arbitrary programs. The device is not tamper-resistant. If an attacker gets ahold of it, he could simply stick the key disk into his PC and start reading the bits on it. In this case, a user could encrypt the bits on the key disk such that a password could be used to decrypt the data. As with smart cards, key disks have the problem of the untrusted reader. Whatever the user is entering the password into can be used to decrypt the bits on the key disk. The password could be potentially captured, and the key disk may not have good support for authentication.

To protect against typos like this, we can run a special helper test as part of our automated test suite. This helper test, AutoMapperConfigurationTester, is shown in listing 18.10.

Each event source in the context is given a priority, defaulting to G_PRIORITY_DEFAULT or zero. Sources with a higher priority will be given precedence over those with a negative priority. Examples of event sources are timeouts and idle functions. GLib also provides GMainLoop, which represents one instance of the main loop. A new main loop can be created with g_main_loop_new(), where a NULL context will use the default. Setting is_running to TRUE states that the main loop is running, although this will automatically be set when you call g_main_loop_run(). GMainLoop* g_main_loop_new (GMainContext *context, gboolean is_running);

[TestFixture] public class AutoMapperConfigurationTester { [Test] public void Should_map_everything() { AutoMapperConfiguration.Configure(); Mapper.AssertConfigurationIsValid(); } }

An external device allows the owner of a key to remove the key from the host system, and maintain physical possession of the device that carries the key. However, all of the options introduced are vulnerable to situations in which the host system the device is connected to has been compromised and is running malicious code. Such malicious code could, for instance, make the user believe that she is providing her key to authorize an intended transaction, but actually causes the key to be used to authorize a modified or entirely different transaction. An important advantage arises from devices where the cryptographic operation (e.g., digital signature) is actually executed on the device, and where the private key material never leaves the device (e.g., smart cards or HSMs). If the device is connected to a compromised host, the attacker s malicious code may be able to use the device to perform cryptographic operations with the user s key while it is connected. However, unlike in the case of a key disk, the malicious code cannot extract the key and continue using it after the device has been disconnected again.

Tip The gtk_dialog_run() function blocks the main loop from continuing by creating its own GLib main

When this test is run against our broken profile in listing 18.10, we ll get a helpful message indicating that the Typo property isn t mapped.

loop with g_main_loop_new(). It will continue to run until g_main_loop_quit() is called on the loop.

Earlier in this chapter we mentioned applying special formatters to member mappings. These formatters are all implementations of IValueFormatter, an AutoMapper interface that defines the contract between AutoMapper and our custom formatting code. Listing 18.11 shows this interface.

Once keys have been generated and stored safely, they can be used to initiate a conversation (e.g., between Alice and Bob). In the case that Alice and Bob already have access to the same