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Case Scenarios
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In the following case scenarios, you will apply what you ve learned about user and application security. You can find answers to these questions in the Answers section at the end of this book.
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Case Scenario 1: Creating Custom Authentication Methods
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You are a developer in the IT department of Litware, Inc., a company that manages electronic distribution for software companies. Your manager asks you to develop a
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12 Review
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Windows Forms application for the Accounting department. The application needs to work with the existing database to enable the Accounting team to keep track of accounts payable, and, for authorized users, to issue payments. You interview key personnel and review technical requirements before coming up with your solution.
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Interviews
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Following is a list of company personnel interviewed and their statements:
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IT Manager The accounting team wanted to upgrade their commercial
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accounting package, but it costs like a zillion dollars and I said we could write our own program to add the new functionality they needed for, like, half that cost. They just need to enter payments when a bill comes in and then click a button to make the payment. Oh, they re concerned about security because apparently they don t trust some of their people. I m not sure how they want to control things, but I will tell you that the user accounts and groups they use to access the application are stored in the database, not in our Active Directory.
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Accountant Our needs, actually, are pretty simple. We have three different
types of employees: temps, accountants, and managers. The temps do data entry and create new accounts payable entries. The accountants pay bills, but only if these bills are less than $1,500. Any bill $1,500 or higher must be paid by a manager.
Database Administrator This accounting database is a nightmare, but we re
stuck with it. There s one big table, called Users, that has a row for each user containing the user name and password in clear-text. Yeah, I told you it was bad, but at least you won t have to fool with encryption. There s another table named Groups that contains a row for every group membership. So, for example, John the temp has a row in the Users table containing his user name and password, and a row in the Groups table that indicates he is a member of the Temps group. Lori the IT manager happens to be in both the Accountants and Managers groups, so she has one row in the Users table and two rows in the Groups table. Make sense
Technical Requirements
Create a Windows Forms application that implements a customized authentication mechanism that queries the accounting database. Assume that you will have two methods: AddBill and PayBill. Use each user s group memberships to determine whether the user can run a particular method.
12 Review
Questions
Your manager shows up and asks you the following questions: 1. Which classes or interfaces will you use to implement the custom authentication mechanism 2. How will you restrict access to the AddBill method 3. How will you restrict access to the PayBill method
Case Scenario 2: Protecting Data by Using Cryptography
You are a developer for Blue Yonder Airlines. Blue Yonder Airlines is a national airline that has been growing rapidly in the past two years and has more than quadrupled the number of flights in that time period. Blue Yonder Airlines has only a handful of developers, however. Your manager recently sent you to security training, and now plans to use your skills to provide recommendations for different security problems throughout the organization.
Questions
Answer the following questions for your manager: 1. We keep the master records of all flights and passengers in a centralized database. An application that our team created then transfers that data to remote offices. What s the best way to encrypt this data 2. Our application stores user names and passwords in a database. How should we protect those passwords 3. Occasionally, we distribute bonuses to employees and customers in the form of frequent flier miles and upgrades. These bonuses are always distributed from the central office. We want the application running at the remote offices to be able to verify that the bonus originated from the central office. How can we do this
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