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The client can require that the server has a proof of identity, or that it identifies itself as a particular subject. This is like asking, Do you have a card that proves you are over eighteen years old versus Do you have a card that proves you are Joe Bloggs The first case ( Do you have a credential ) can be specified in the client configuration file by just adding the ServerAuthentication.YES constraint: import java.security.Permission; import net.jini.core.constraint.InvocationConstraint; import net.jini.core.constraint.InvocationConstraints; import net.jini.core.constraint.ServerAuthentication; import net.jini.security.BasicProxyPreparer; import net.jini.constraint.BasicMethodConstraints; client.TestFileClassifierProxyPreparer { preparer = new BasicProxyPreparer( /* Don't verify the proxy. */ false, /* Require authentication as anyone */ new BasicMethodConstraints( new InvocationConstraints( new InvocationConstraint[] { ServerAuthentication.YES }, null ) ), new Permission[] {} ); } The client is the TestFileClassiferProxyPreparer used throughout this chapter. However, although it doesn t look up any certificates, it does seem to need a truststore to be specified a bug You can specify a truststore by adding the property to the runtime: -Djavax.net.ssl.trustStore=truststore.client The second case requires specifying which principal(s) the server is required to authenticate as. The most common case is when the client requires a single principal as identity. The ServerMinPrincipal is used for this, with constructors for a single principal or for a set of principals. In order to get an SSL principal, you need to do something like pull it out of a keystore. This involves obtaining the list of users from a keystore and getting a single user from this list. The KeyStores class in Jini allows you to perform these steps from within a configuration file. The client is still unaltered from TestFileClassifierProxyPreparer. The configuration file is now preparer-auth-server.config:

{ public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); Apple apple = new Apple(); apple.SetMyColor(); Orange orange = new Orange(); orange.SetMyColor();

H = 100

MessageBox.Show ("apple | IsEdible: " + apple.IsEdible + " Color: " + apple.MyFruitColor + " orange | IsEdible: " + orange.IsEdible + " Color: " + orange.MyFruitColor); } } }

import java.security.Permission; import net.jini.core.constraint.InvocationConstraint; import net.jini.core.constraint.InvocationConstraints; import net.jini.core.constraint.ServerAuthentication; import net.jini.security.BasicProxyPreparer; import net.jini.constraint.BasicMethodConstraints; import com.sun.jini.config.KeyStores; import net.jini.core.constraint.ServerMinPrincipal; client.TestFileClassifierProxyPreparer { /* Keystore for getting principals */ private static users= KeyStores.getKeyStore("file:resources/security/truststore.client", null); private static serverUser = KeyStores.getX500Principal("server", users); preparer = new BasicProxyPreparer( /* Don't verify the proxy. */ false, /* Require authentication as "server" */ new BasicMethodConstraints( new InvocationConstraints( new InvocationConstraint[] { ServerAuthentication.YES, new ServerMinPrincipal(serverUser) }, null ) ), new Permission[] {} ); }

Figure 3-11.

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Classes such as ServerMinPrincipal can take a set of principals and AND them together, such as Are you Jan Newmarch AND are you over eighteen AND are you the father of Katy Newmarch A client may want to express a set of alternatives, such as Do you have a driver s license OR do you have a social security card The ConstraintAlternatives class can be used to handle these cases.

Figure 5-25 shows how to measure the wet bulb temperature. The Temperature Sensor extends only to about the lip of the jar. The rest of the absorbent material wrapped around it supplies water from the vial to keep the sensor wet. Don t submerge the sensor into the water, or else you ll read a temperature that s warmer than the wet bulb.

Figure 3-11. You now see the correct values for each object s color property. You can download a copy of this foundation.com/Blend4Book/OOP.zip. OOP project here: http://windowspresentation

Summary

The same mechanism a server uses to authenticate itself is used by the client. That is, the client sets up a login context, logs in, and then runs code as a particular subject. The modified code is client.TestFileClassifierAuth:

Figure 5-25. Wet bulb Temperature Sensor The humidity calculation is related to the ratio of vapor pressures of water at the two temperatures, plus other factors such as air pressure. They re rather complex, and the NXT doesn t have the math capability to implement them. Instead, you can use a simplified equation that won t have more than 5% error over the range you re likely to be measuring. The equation expects the temperatures to be in Celsius. The NXT-G program in Figure 5-26 shows the equation converted to code. The original NXT used only integer arithmetic, so the multiplication by 244 needed to be done before the divide. You don t need to worry about the order with second generation NXT software because it uses floating-point arithmetic. Remember to set the Legacy Temperature blocks for Celsius.

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