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COM+ has its own infrastructure for enforcing role-based security. You can apply roles at the component, interface, or method level. From Serviced Components, the .NET developer has two main tasks: creating COM+ roles and enforcing security at the appropriate level to make sure a caller is in the required role for the service it s attempting to call. Role creation is done with an assembly-level attribute: [assembly: [assembly: [assembly: [assembly: SecurityRole("Executive")] SecurityRole("Director")] SecurityRole("Manager")] SecurityRole("Grunt")]
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These attributes result in the corresponding COM+ roles that are created (see Figure 7-10).
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Figure 7-10. Roles created in COM+ with .NET assembly-level attributes Role membership can now be enforced via either declarative aspects or imperative code. The declarative option is attractive, as it saves you from pushing complex conditional logic
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CHAPTER 7 ENTERPRISE SERVICES
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into the code, and enables you to simply decorate your types with declarations of their security requirements. You use the SecurityRole attribute for this purpose as well. (This code is in the Serviced project of the Code07 solution.) [SecurityRole("Manager")] public class RBDemo { public RBDemo() {} public DataSet GetManagerData() { //implementation return new DataSet(); } [SecurityRole("Executuve")] public DataSet GetExecutiveData() { //implementation return new DataSet(); } } In this class, callers to any method must be in the Manager role. You ve further restrained access to the GetExecutiveData method, requiring that callers to that method are in the Executive role. You could also apply the attribute to an interface declaration. Sometimes you need a finer grain of control over your role-based security implementation. For example, you may want to render a list of reports, and user roles determine access to the reports. In these cases, you ll need programmatic access to the roles information. This is exposed to use via the SecurityCallContext type. While this may at first appear to be similar to ContextUtil, security context is different, so using SecurityCallContext is required in this case. public void GetReportData(DataSet reportCriteriaData) { // Get the current security call context SecurityCallContext callCtx = SecurityCallContext.CurrentCall; // Verify role based security is enabled (optional) if (callCtx.IsSecurityEnabled) { // Only allow managers to generate reports if (callCtx.IsCallerInRole("Manager")) { // proceed with report generation } else {
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CHAPTER 7 ENTERPRISE SERVICES
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// security error } } } Using imperative coding enables you to introduce different flow-of-control scenarios into your code based on the role of your calling users.
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Once you get your classes inheriting from the Serviced Component base class written and compiled, you ll need to configure them within the Component Services environment. You can be lazy or proactive about this. The lazy approach enables the runtime to do this the first time someone creates an instance of the type. Seriously, it s called lazy loading. The nice thing about this approach is that there s no additional setup or installation step that needs to occur. The first time the component is requested, the runtime makes sure the COM+ application exists and checks all of the other assembly-level attributes (such as role declarations) to make sure they re present as well. Anything that doesn t exist will be created. If the application already exists, it will be shut down and the changes applied. Components and their interfaces then get registered and configured with COM+. The best reason to use this type of registration is right in its name: laziness. This approach should be avoided if at all possible. The downside to lazy registration is that there s a significant performance hit on the first request to your application. Especially if your app is using queued components, this delay can last as long as a few seconds. The other, probably more serious, drawback is that the user running the process has to be an administrator to have the appropriate permissions to do this. So when you re running Serviced Components from ASP .NET, the user running the ASP .NET Framework must be configured as an administrator. This is usually a show stopper for folks, and leads them to your second option: registering the components yourself using a command line tool (seen with its options displayed in Figure 7-11).
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