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If it is, we assign the file variable to its value. This is the file that will be encoded later in the script. If the parameter is not defined, we output the script usage and exit. Please note that the exit command is used with a value that will be the return code of the script. In this case it is nonzero (1), indicating that there was an issue encountered during execution. Next you have to validate the positional parameter for the e-mail address that is passed to the script. This is done in the same way as for the file argument.

For asymmetric encryption, you must set things up as follows: Step 1: Generate a private-public key pair based on a digital certificate Step 2: Install the private key in the client s local certificate store Step 3: Install the public key in the server s local certificate store Step 4: Implement code in the Web service client to generate an encrypted SOAP request message You have a number of options for obtaining test certificates: Use the WSE 20 test certificates Use the makecertexe command-line utility to generate test certificates Obtain a test certificate from VeriSign The WSE 20 sample projects ship with test certificates and keys, which you will use here because they are convenient Alternatively, you can obtain a test certificate from VeriSign at http://wwwverisign.

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private void impersonate(KerberosToken token) { if (token.Principal!=null && token.Principal.Identity is WindowsIdentity) { // Obtain user identity WindowsIdentity callerIdentity = token.Principal.Identity as WindowsIdentity; // Initialize context object WindowsImpersonationContext context = null; try { // Impersonate the user context = callerIdentity.Impersonate(); // Access a file that only this user has permissions to read FileStream x = File.OpenRead("c:\\temp\\Impersonation.txt"); x.Close(); } catch (Exception ex) { // rethrow the exception throw ex; } finally { context.Undo(); } } } Add a line at the beginning of the RequestQuote method that passes the Kerberos token to the Impersonate method. impersonate(RequestSoapContext.Current.Credentials.UltimateReceiver. GetClientToken<KerberosToken>()); This method starts by obtaining the user s identity from the Kerberos token, and then it impersonates the user by setting its identity in the current security context. After the user has been impersonated, the code opens the Impersonate.txt file and it immediately closes it. If the user is not impersonated successfully, this line will cause a SystemUnauthorizedAccess exception.

Finally, if no parameters were passed to the script, we display the script usage and exit with the nonzero return code as before.

com, although you will have to provide information about yourself or your company, as well as the specific server name that you are generating the test certificate for Finally, you have the option of using the makecertexe command-line utility, which will generate selfsigned certificates that you can use in your test projects This utility is located under the Microsoft Visual Studio NET 2003 program files directory, typically under \SDK\v11\bin\ You will want to add this path to your computer s environment variables in order to call the utility from within any subdirectory Whichever certificate option you choose, you will need to obtain a private key and a public key, and register them in certificate stores that are accessible to both the client and the server Even if you are developing on the same machine, the private and public keys will typically reside in separate certificate stores.

Next is the heart of the script; it is the part that encodes the file and then sends the file to its destination.

5 provides a detailed description on how to install test certificates, so please refer there for a more detailed discussion But briefly, and assuming you are using the sample certificates that ship with WSE 20, here are the installation steps that you need to take:.

The impersonation code has to be implemented within a try, catch, finally block. The goal is to restore the original security context after the file has been read or after an unexpected error. Impersonation can also be achieved by adding the following line at the web.config file. However, this applies to all the methods in the Web service and it doesn t allow you to impersonate a user only for a particular task: <identity impersonate="true" />

basefile=`basename $file` echo "A uuencoded file is attached called: $basefile" > $tmpfile echo >> $tmpfile uuencode $file $file >> $tmpfile mail -s "$basefile attached from $from" $address < $tmpfile rm $tmpfile

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