Permissions in Visual C#

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Permissions
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The Add Users/Groups page, where you can set permissions on the LOB system
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Exactly the same permissions can be applied to entities as well. Note in figure 3.9 that you can apply permissions from any level to the descendents. For example, you could set all permissions at the Business Data Catalog level, and then push the permissions down to the LOB systems, and then down to the entities.
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The Copy all permissions to descendants option
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Security in the Business Data Catalog is something that can also be configured using the BDC API. Examples will be shown in the Business Data Catalog object model chapter of this book (chapter 8). In the next section, we ll discuss the BDC Web Parts and how you can surface the data on your SharePoint sites. Upon adding a web part on the page, you ll notice the errors that are displayed should you not have permission to execute the returned entity. One of the main advantages of the BDC is that you can add AD groups, authenticated users, and your SharePoint groups when configuring the BDC permissions. All of the permissions can also be set up in the application definition file. You ll notice that, if you export an ADF from SharePoint, your configured permissions are included. This helps when moving your ADF from staging to production.
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Security
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Exercise: employing RevertToSelf authentication
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In this exercise, we ll explore the application definition file security settings and modify the XML file to use RevertToSelf instead of PassThrough authentication.
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Edit the application definition file that we created in chapter 2 (c:\AppDefs\Products.xml) in Visual Studio or Notepad. (If Visual Studio isn t available, I like to use XML Notepad 2007, which can be downloaded from
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http://www.microsoft.com/downloads/details.aspx familyid=72d6aa49-787d4118-ba5f-4f30fe913628&displaylang=en.)
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On line 12 of the file, you should see that the authentication mode is set to PassThrough. Make sure that you log in to SharePoint as a user who doesn t have permission to the Northwind database. We ll refer to this user as User A. Navigate to a SharePoint site, and add a Business Data List Web Part. Configure the web part to point to the Products entity. (You should find that an error is returned, as you don t have permissions to view that table.) Log in to SharePoint as another user (we ll refer to that user as User B), and you should be granted permission to the data in the web part. (This proves that your SharePoint user account is being passed through to the database.) Now change the XML file to use RevertToSelf. Use Find and Replace if necessary, as there will only be one instance. Log back on to SharePoint as User A or User B. Neither user should be able to see the data. You can now grant User B permission to the products data by using security trimming. Open SharePoint Central Administration. Click the Shared Services Provider page, which can be found in the Quick Launch area on the left side of your screen. In the Business Data Catalog section, click View Entities. Click the drop-down on the Products entity and choose Manage Permissions. Click Add Users/Groups. Add User B and select Execute Permission.
11 12
13 14
Summary
Test the web part by logging on as User A and User B. Only User B should be able to see the data, even though both are accessing the database as the Application Pool ID.
You should now see how RevertToSelf allows you to connect to the LOB system as a specific user (the Application Pool Account). This overcomes the double hop issue, as well as allows you to use connection pooling. Even though we re connecting to the LOB system as one specific user, you can see how you can then trim the results using BDC security trimming. The security trimming will be applicable everywhere in SharePoint, including in search results.
Summary
Within this chapter, we explored one of the biggest problems that occurs when accessing your data the double hop issue. If you follow Microsoft s best practices, you ll be using Trusted Security on your back-end database, you won't have SQL Server and your SharePoint Web Front-End Server on the same machine, and you ll use Integrated Windows Authentication configured for SharePoint. This means you ll suffer from the double hop issue. We looked at ways of overcoming this issue with BDC, which included using RevertToSelf, Single Sign-On, or Kerberos. We also explored how permissions on the Business Data Catalog, LOB systems, and entities can be applied using your Shared Services Provider. This means that we don t have to worry too much about security if we use RevertToSelf. We ll be able to trim permissions on the data itself. Now that the security is in place, we ll look at the Business Data Catalog Web Parts. We ll explore each of the out-of-the-box BDC Web Parts in the next chapter, and then later on in the book (in chapter 9), we ll explore how to create our own custom web parts.
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