c# generate barcode from string Implement a policy for a Web service application. in Visual C#

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Implement a policy for a Web service application.
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Create a policy file manually. Declare the set of policies in a policy file.
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WSE Security
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Map policies to SOAP endpoints. Configure a policy file in a configuration file. Create and enforce a custom policy. Create a policy file by using the WseConfigEditor3 tool. Set a policy in a client application and in a client computer. Encrypt a SOAP message. Decrypt an encrypted SOAP message. Add a filter. Remove a filter. Shuffle the order of the filters. Enable the Trace filter. Create custom input and output filters.
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Encrypt and decrypt a SOAP message.
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Implement filters in a Web service application.
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Lessons in this chapter:
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Lesson 1: Web Service Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399 Lesson 2: Custom Policies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 410 Lesson 3: Message Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
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Before You Begin
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To complete the lessons in this chapter, you must have
A computer that meets or exceeds the minimum hardware requirements listed in the Introduction of the book. Microsoft Visual Studio 2005 and the .NET Framework 2.0. Knowledge of programming in Microsoft Visual Basic or C# and a basic under standing of Extensible Markup Language (XML).
In addition, each of the code examples in the chapter assumes that the following namespaces have been added at the top of the code file:
'VB Imports System
Before You Begin
Imports Imports Imports Imports Imports Imports Imports Imports //C#
using using using using using using using using
System.Collections.Generic
System.Text
System.Xml
System.Security.Cryptography.X509Certificates
Microsoft.Web.Services3
Microsoft.Web.Services3.Design
Microsoft.Web.Services3.Security
Microsoft.Web.Services3.Security.Tokens
System;
System.Collections.Generic;
System.Text;
System.Security.Cryptography.X509Certificates;
Microsoft.Web.Services3;
Microsoft.Web.Services3.Design;
Microsoft.Web.Services3.Security;
Microsoft.Web.Services3.Security.Tokens;
To import the Microsoft.Web.Services3 namespace and child namespaces, it is further assumed you have added a reference to the Microsoft.Web.Service3.dll assembly.
Real World
William Ryan It wasn t all that long ago that security concerns were largely ignored by the development community. I had worked for a while before returning to graduate school, so when I graduated, most of my friends who worked in the industry had substantially more real-world experience than I did. One day over lunch, I men tioned that the product they were developing sounded like it had a major flaw; it almost totally ignored security. When I mentioned the specifics, most of the people laughed at me, explaining that points such as the one I was making were made by people who spent too much time in school and not enough time in the field. Security was not something clients or venture capitalists could see, so focusing on it was something that was viewed by many as non-value added. It was almost exactly three years after we had this discussion that I was eating lunch with three of the five people at the original meeting. They were quite dejected because they had just been through a humiliating experience and lost a potential customer that they were sure they would win. They had moved a large part of their infrastructure to Web services and focused almost exclusively on performance and functionality. Just about everything that could be done inter nally could now be done by trading partners. They were convinced that security
10
WSE Security
was pretty much an afterthought and didn t plan on addressing it until after the application was live. During the demo, they showed their customer how easy it was to access the system externally. They showed the customer how much could be done remotely without having to develop a large amount of new code. Unfor tunately, one of the people performing the demo entered some values that cor responded to a different customer. He had intended to show the customer how easy it was to access all the customer s financial data, but before he even realized what happened, he showed the customer a different company s data. Although a few of the people at the demo were focusing on how great the new functionality was, the financial executive there was overwhelmed by the fact that he saw the bank accounts, names, addresses, and much more information of the other company s customers. When the person doing the demo realized what happened, he tried to smooth over the mistake by saying Well, this was just a careless mistake on my part; I used your company s user name and password but specified a different company as the target. The gentleman giving the demon stration thought this explanation would comfort the people watching. Instead, he just proved unequivocally how easy it would be for someone to accidentally view all of the client s confidential data. Far from comforting the people watch ing the demo, this instead served to persuade them how dangerous having our company store their data would be. Not only did they not buy the expanded services, within a week they canceled the account, citing the debacle at the demo as their reason. The demo showed some impressive functionality with Web services, but because security wasn t really implemented, a simple data entry error could expose very sensitive data. Using even simple security features, such as those provided in WSE 3.0, would have stopped another company s data from being shown and might well have saved the account. Security should never be an afterthought when data is exposed via the Web. Securing this information is even more critical over the Web than over a traditional network. At best it s professionally irresponsible not to take security seriously, and at worst it could be something that ruins your career or ends your company.
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