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In planning your security, you want to have an idea of where the threat is coming from. In most cases, the biggest security threat to your organization is not the hacker outside your organization mounting a brute-force attack on your database. More often, the threat is the person sitting two offices down, or someone who already has an account in your database. Consider the opening example of this chapter, where an existing customer had permissions that were inadvertently granted. Of course, you want to protect your system against outside intruders, but employees, clients, consultants, and others who already have access to your data pose the biggest threat. This is because the chance of them having misconfigured permissions and getting access to unauthorized data is more likely than a stranger getting all the way through the human and technological barriers around your system. In addition, people who understand the organization and technology are more likely to be able to circumvent barriers to get access to the data. Consider the case of a consultant who has been working with the database administrator on a number of projects. The database administrator probably wouldn t question a request from that consultant to get access to a particular table. Database administrators are likely to be less rigorous about verifying a request for access if it comes from someone who is in the office and working with other parts of the system. If each request for access must go up against a formal security policy and plan, there is less chance that inappropriate access will be granted, even if it s an internal request.

Table 8-4. Time and Date Format Strings (Continued)

Figure 13-3. Editing the app.config file using the Enterprise Library Configuration tool You can also specify to encrypt the app.config file, if you wish, by highlighting the Data Access Application Block node and choosing an encryption provider from the right pane under the ProtectionProvider field. When you ve completed all your changes, remember to save them using the File Save Application menu item. You can open your app.config in text mode using Visual Studio to view the changes that have been made to the file. You will notice that your connection strings have been encrypted in this file.

dddd, MMMM dd, yyyy HH:mm:ss aa (for example: Monday, January 30, 2005 10:00:23 AM) yyyy-MM-dd HH:mm:ss (for example: 2005-01-30 10:00:23) MMMM dd (for example: January 30) M/d/yyyy HH:mm:ss aa (depends on locale settings) (for example: 10/30/2002 10:00:23 AM)

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With all that s being written and said about security, you might think that securing your database is just a matter of going through a list of predefined steps to lock down your database. Yes, you can find a lot of information about securing database systems, but all systems are not the same. Your system presents a unique set of variables. What does it mean to be secure

Note If you re using complex binding, you can t use the technique described here. However, many controls that support complex binding have similar features available to you. For example, the GridView allows you to define a format string for any column (as you ll see in 15). The ListBox allows you to supply a format string through the FormatString property (provided FormatStringEnabled is true).

Note Visual Studio might automatically put in Version and PublicKeyToken entries for Microsoft.Practices.EnterpriseLibrary.Data in the app.config file every time you make changes via the Edit Enterprise Library Configuration menu. This may raise exceptions in your code later on. It is a good idea to manually remove this information from the app.config file by hand.

That s not an easy question to answer, and one that has created an industry of security professionals who are passionately working to determine what and how to secure systems and the data that lives within them. To be clear, when we say that we want to secure a database, we re generally referring to controlling access to data. This applies to the ability to see, change, and remove the system s data. We might also lump into that the requirement that the database be available; that is, we would like to prevent the intentional or accidental shutdown of the database or the server where it runs.

Format strings are great for tweaking numbers and dates. However, they don t help you with other values that might come out of a database in a less-than-professional state. For example, certain fields might use hard-coded numbers that are meaningless to the user, or they might use a confusing short form. If so, you need a way to convert these codes into a better display form. If you support editing, you also need to do the converse take user-supplied data and convert it to a representation suitable for the appropriate field. Fortunately, both tasks are fairly easy provided you handle the Format and Parse events for the Binding object. Format gives you a chance to modify values as they exit the database (before they appear in a data-bound control). Parse allows you to take a user-supplied value and modify it before it is committed to the data source. Figure 8-12 shows the process.

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