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often send e-mail to myself containing information gathered from a running system. Most of the information comes as flat text obtained from various files, or output from system commands. From time to time the file that I would like to send is a binary of some type. Sometimes I want a file to show up as an attachment regardless of whether it is a binary. I wrote a few scripts that can perform such a task. They encode the binary file as flat text for transmission and then e-mail the file. The file can then be decoded at the receiving end manually or, more conveniently, by the e-mail client receiving the file. Each script takes as input the binary file and the destination e-mail address.

4. In the Advanced Security Settings dialog, uncheck the Inherit from Parent the Permission Entries box. 5. In the Security pop-up window, click the Remove button, shown in Figure 7-11.

Calling http://localhost/ StockTrader Secure/StockTrader.asmx Web service call successful. Result: Symbol: MSFT Price: 25.15 Change: -0.0137% Press [Enter] key to continue...

The first method uses uuencode to convert the binary file to flat text. This method works, but some e-mail clients, for instance my web-based SquirrelMail client, will not recognize the encoded file. If that is the case, you can simply save the text and decode it yourself with uudecode to obtain the original binary file. First we define a variable specifying the temporary file that will contain the encoded message as well as a variable that holds the script-usage string.

#!/bin/sh tmpfile=/tmp/uu_output.$$ usage="Usage: $0 {filename} {email_address}"

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Security tokens and digital signing allow you to identify a service requestor and to determine whether a request message has been tampered with, but they do nothing to protect the contents of a SOAP message from network sniffers. Encryption technology enables you to generate a cryptographic hash of the SOAP message for transport and to decrypt the message contents at the receiving end. There are two kinds of encryption: Symmetric encryption: Also known as private-key encryption or sharedsecret encryption, this method generates a cryptographic hash using a key that is known to both the sender and the receiver. Symmetric encryption is the least secure encryption method because both sender and receiver must share the same key, and so the encryption is only effective if the key remains secret. Asymmetric encryption: Also known as public-key encryption, this method generates a cryptographic hash based on a private key that is known only to the sender. The receiver is given a public key that will decrypt a message that was hashed with the corresponding private key. Asymmetric encryption is the most secure method, and there are a number of related encryption methodologies to choose from, including SHA1 and Triple-DES. Interestingly enough, when a SOAP message is encrypted, only the body of the message gets hashed. If your SOAP message includes custom SOAP header

Figure 7-11. The Advanced Security Settings dialog 6. Click OK on the Advanced Security Settings dialog. You will get a prompt asking you if you want to remove all the users from the list. Click Yes. You are going to add a new user with read permissions in the next step. 7. In the Security tab, click the Add button and enter the name of the client user that you are going to authenticate at the server. Use the domain\username format. 8. Make sure the user has read access to the file and click OK. This file will help you validate whether the impersonation is taking place. Remember that this service is running under a domain account different from the one that you used to log on to the client computer. So if impersonation doesn t take place, the following code will not be successful:

Now we validate the input by determining whether the positional parameter holding the binary file is defined.

values, then you must encrypt them separately. In this section, you will see how to encrypt the body of a SOAP message using asymmetric encryption.

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