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fter writing many scripts, I realized there were several functions and routines I was using repeatedly. Sometimes I would write the code for these duplicated functions again, and other times I would copy and paste the code from an earlier script. But the best coding practice is to keep a file around that contains all of your already tested and working functions. This creates a scriptwriter s toolbox, or, in programming speak, a library. With a library in place, many of the tools you need often are close at hand and you don t have to code the functions anew each time you need them. This chapter shows you how to set up a standard function library and how to utilize the library in your scripts.

The followings steps show you how to secure a client application using the Kerberos security assertion: 1. Open the WSE 3.0 Settings Tool, go to the Policy tab, and click the Add button. 2. Name this policy KerberosPolicy and click OK. 3. Click Next in the welcome screen. 4. In the Authentication Settings step, choose to secure a client application using Windows as the authentication method. Click Next to continue. 5. The Kerberos Token step prompts you to enter the Service Principal Name. Type in wse/host1, where host1 is the name of your computer. Choose Impersonation in the drop-down box and click Next. 6. In the Message Protection step, choose to Sign and Encrypt the message, and uncheck the Establish Secure Session box. Click Next to continue. 7. Review the policy summary, shown in Figure 7-10, and click Finish.

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[SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.UnmanagedCode)] public class CustomUsernameTokenManager : UsernameTokenManager { protected override string AuthenticateToken( UsernameToken token ) { // Step 1: Retrieve the username from the token byte[] username = System.Text.Encoding.UTF8.GetBytes( token.Username ); // Step 2: Retrieve the user's password from a separate source, // e.g., database table // Code goes here // Step 3: Return the retrieved password // WSE will automatically compare it against the password // that created the token return Convert.ToBase64String( password ); } }

The library itself is simply a collection of functions held in a single file. When the library is brought into your script s environment, you can call any of the library functions as if they were in your original code. You could create a single library that contains all of your functions or, if you have a large and varied number of them, create a set of libraries where each one is specific to a category of coding. Libraries are not only handy to have around; they eliminate redundant coding as well as provide a common environment for all programmers involved to work from. Function libraries reduce redundant code and speed up the development process, plus they can reduce debugging and code-hardening time. If there are bugs in any of the functions, fixes will positively impact all scripts that rely on those bits of code. Function libraries can also level the programming field when working with many and varied system types by adding a layer of abstraction between system differences and the programmer writing the code. The following example library is very simple and contains only a single function. To keep things organized, especially when files get large, you should write the functions with good indenting form as well as comments about what the code does. Include in the library file a header that lists all the functions and gives a brief description of each, along with any variables that get defined. With the header you could include a list of revisions and owners. This is especially useful when working in a team where other members may be making changes.

The custom token manager must be registered in the Web service web.config file as follows:

#!/bin/echo Warning: this library should be sourced! # ostype(): Define OSTYPE variable to current operating system ostype() { osname=`uname -s` # Assume we do not know what this is OSTYPE=UNKNOWN case $osname in "FreeBSD") OSTYPE="FREEBSD" ;; "SunOS") OSTYPE="SOLARIS" ;; "Linux") OSTYPE="LINUX" ;; esac return 0 }

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