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Listing 7-4 shows the configuration of the new policy. Pay special attention to the <token> element, where the target principal and the impersonation level are defined. Listing 7-4. Configuration of the KerberosPolicy <policy name="KerberosPolicy"> <kerberosSecurity establishSecurityContext="false" renewExpiredSecurityContext="true" requireSignatureConfirmation="false" messageProtectionOrder="SignBeforeEncrypt" requireDerivedKeys="true" ttlInSeconds="300"> <token> <kerberos targetPrincipal="stocktrader/host1" impersonationLevel="Impersonation" /> </token> <protection> <request signatureOptions="IncludeAddressing, IncludeTimestamp, IncludeSoapBody" encryptBody="true" /> <response signatureOptions="IncludeAddressing, IncludeTimestamp, IncludeSoapBody" encryptBody="true" /> <fault signatureOptions="IncludeAddressing, IncludeTimestamp, IncludeSoapBody" encryptBody="false" /> </protection> </kerberosSecurity> <requireActionHeader /> </policy> The last step is to modify the StockTraderConsole.cs class. The Run() method should look like the following: public void Run() { // Create an instance of the Web service proxy StockTraderProxy.StockTraderWse serviceProxy = new StockTraderProxy.StockTraderWse(); // Use the logged in user identity as the identity of the current thread. // You will need to add a using clause for the System.Security.Principal namespace AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);

<microsoft.web.services2> <security> <securityTokenManager type="StockTrader.CustomUsernameTokenManager, StockTraderSecure" xmlns: wsse="http://docs.oasis-open.org/wss/2004/01/ oasis-200401-wss-wssecurity-secext-1.0.xsd" qname="wsse:UsernameToken" /> <x509 allowTestRoot="true" allowRevocationUrlRetrieval="false" verifyTrust="false" storeLocation="CurrentUser"/> </security> </microsoft.web.services2>

The first line of the library is an excellent method of ensuring that the library is sourced rather than executed as a regular script. With this line, error output will be generated if someone attempts to run the library instead of sourcing it into the environment. The output would look like this:

The manager s token authentication feature is accessed using the VerifyToken method, which you can see being called in Listing 6-7. If the token password and

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Another way to avoid execution of libraries is to make them nonexecutable. The first function, ostype(), determines the operating system of the computer on which the library is running. Because there are subtle differences between operating systems, knowing what OS your script is running on will help you take the differences into account. There are, of course, many more operating systems than we are able to list here.

// Access the IIS based service serviceProxy.Url = "http://host1/StockTraderSecure/StockTrader.asmx" ; // Use the credentials of the current security context serviceProxy.UseDefaultCredentials = true; // Set the client policy serviceProxy.SetPolicy("KerberosPolicy"); // Call the service Console.WriteLine("Calling {0}", serviceProxy.Url); string Symbol = "MSFT"; StockTraderProxy.Quote q = serviceProxy.RequestQuote(Symbol); // Show the results Console.WriteLine("Web Service Response:"); Console.WriteLine(""); Console.WriteLine( "\tSymbol:\t\t" + q.Symbol ); Console.WriteLine( "\tCompany:\t" + q.Company ); Console.WriteLine( "\tLast Price:\t" + q.Last ); Console.WriteLine( "\tPrevious Close:\t" + q.Previous_Close ); } protected static void Error(Exception ex) { Console.WriteLine("EXCEPTION!" + ex.Message + "\n" + ex.StackTrace); } The SetPrincipalPolicy method will assign the identity of the logged-on user to the current thread and the UseDefaultCredentials property will indicate the proxy to attach those credentials to the outgoing message. Replace the host1 name of the server for the name of your local computer and run the application. If you get any security exceptions, review the instructions to set up the environment. It is important that you use a domain account and that you use the SPN name correctly. Kerberos authentication is an effective mechanism but you need to carefully configure the deployment environment in order to have a successful communication between the service and the client.

6

The code in this section comes from a few utility functions that I find very useful. You will probably come up with many more that are specifically geared toward the systems you work with. Gentoo Linux provides an excellent example of a library of shell functions. If you re running this Linux distribution, you can find the library under the filename /etc/init.d/functions.sh. Even if you re not a Gentoo user, you should be able to get a copy of this library and use it by performing an Internet search for Gentoo and functions.sh, making sure that you follow the applicable usage guidelines contained within the file. The following are a few functions that I ve found particularly useful to include in my standard library. The first function is fairly straightforward, but it contains a cool trick. Pass this function any number, and it will determine whether the number is even or odd. This function was originally used in a moderately large environment where various tasks needed to be load-balanced. We chose a simple method of splitting the environment in

the password that the manager returns do not match, then the VerifyToken method raises a SOAP fault with the following exception message:

color combination. The switches passed to xterm are for the font, color combination, scroll-back configuration, and title-bar definition. All of these can be specified in the user s configuration file. The -e switch to xterm defines what you want to have executed within the xterm window. In our case, it will be either an ssh, rlogin, or telnet connection to the remote machine.

Let s take a look at how to impersonate the client user at the server by obtaining his identity from the Kerberos token. We are going to create a file in the server hard drive that only the client logged-in user has permission to access: 1. Create a new file under the C:\temp folder named Impersonation.txt. 2. Right-click the Impersonation.txt file and choose Properties. 3. Select the Security tab and click the Advanced button.

However, if the Web service call is successful, then the console will display the requested stock quote:

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