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First a tmpfile is created with the echo command containing a summary of what is attached for the reader of the message. A blank line is added using the echo command between the text of the e-mail and the text of the encoded binary file. The file is encoded with the uuencode utility and appended to the tmpfile following the text of the message. The uuencode and uudecode commands were originally designed for this very purpose, to transmit a binary file via a transmission method that supports only text. After the file has

There is another feature provided by Kerberos that is named Constrained Delegation. This feature allows the impersonated client user to access a resource on a different machine. The service user that will be performing the delegation needs to be configured in Active Directory. This configuration consists of choosing a list of services that the user is authorized to delegate on. In Figure 7-12, the WSE user is authorized to delegate credentials to the HTTP server of the MTYSVR01 computer.

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Step 1: Open the MMC console and add the Certificates snap-in for both Current User and Local Computer. Step 2: Open the Personal folder of the Current User certificate store and import the sample personal information exchange file titled Client Private.pfx. This is the private key that the Web service client will use to encrypt requests to the Web service. Step 3: Open the Personal folder of the Current User certificate store and import the sample test certificate titled Server Public.cer. This is the public key that the client uses to digitally sign requests for the Web service. Step 4: Open the Personal folder of the Local Computer certificate store and import the sample test certificate titled Server Public.cer. This is the public key that the Web service uses to decrypt the client s request. Once the certificates are installed you are ready to modify the Web service client to generate encrypted SOAP request messages.

been encoded, we send the tmpfile to the destination e-mail address with the mail command; the tmpfile is then removed.

Certificates can be tricky to work with. It is not uncommon to receive cryptographic errors or permission errors when you attempt to generate encrypted requests. Always verify that you have installed the certificates correctly. 5 provides detailed information on how to install the sample certificates that ship with WSE 2.0. Unfortunately, certificate issues may also be caused by the way your local computer has its operating system and folder permissions configured. Your best source for troubleshooting information is the WSE 2.0 documentation, newsgroups, developer Web sites, your peers, and, of course, this book!

Tip If the uuencode and uudecode commands are not installed on your system, you can find the appropriate installation package of the UNIX sharutils utilities, where both commands are included. A version of sharutils should be available for most current platforms.

Figure 7-12. Delegation properties tab in Active Directory You have the option to trust the user for delegation to any service. This is known as Unconstrained Delegation but it is not recommended because if the security of the service is compromised it means that all the services in the network are also compromised.

The client code for generating encrypted SOAP request messages is very similar to the code for digitally signing messages. The client retrieves the applicable X.509 certificate-based private key from its personal certificate store and then uses this key to generate a hash of the SOAP message. Listing 6-9 shows you the required code. Listing 6-9. Encrypt a SOAP Request Message Using an X.509 Certificate

The next script performs roughly the same task as the first, but it uses MIME encoding. This type of encoding is more current than the uuencode method; it is also standard for e-mail clients that have to be able to process a message with an attachment. The code here is very similar to the code used in the previous example except that it doesn t create an encoded file that is e-mailed; instead the script creates a specially formatted file constituting an e-mail message that contains the appropriate headers for e-mail clients to process and recognize as an attachment. Once again we first define the temporary file that contains our message and the usage statement.

public void EncryptRequestUsingX509Certificate() { // Retrieve the X.509 certificate from the CurrentUserStore certificate store X509SecurityToken token; string ClientBase64KeyId = "gBfo0147lM6cKnTbbMSuMVvmFY4=";

#!/bin/sh tmpfile=/tmp/mime_output.$$ from="$USER@`cat /etc/dnsdomainname`" usage="Usage: $0 {filename} {email address}"

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