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Figure 9.19 The Security tab of the COM+ application Properties dialog box
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COM+ application in the Component Services Manager and select Properties, you will see the application s Properties dialog box. Click the Security tab (figure 9.19). You must select the checkbox Enforce Access Checks For This Application. In this case, we will be enabling security for the whole application, so we must enforce access checks at the application level. You should also carefully evaluate how deep you would like your security model to run into your component. If you would like to validate users only to the application level, select the Perform Access Checks Only At The Process Level option. With this option enabled, your system will check security only when a user makes a call into any component inside the application. Alternatively, if you want to check security at levels deeper than the application (i.e., the component, interface, or method level), choose Perform Access Checks At The Process And Component Level. Your system will then enable access checks on calls made at every level of the application. Next, you can administer security settings on each component inside your application. Right-click your component in the Component Services Manager and select Properties. The Security tab of the Properties dialog box (figure 9.20) allows you to enable component-level access checks. Once you enable this option, you can specify which COM+ roles have the security privileges to create an instance of your component by either checking or deselecting the role in the list box. Finally, let s go ahead and set the security properties of the _Contact interface. When you open the Properties dialog box and click the Security tab (figure 9.21), you ll see that you inherited three roles from the component. You can enable/disable these roles for the interface. At this level, all you need to do is specify which roles have access
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Figure 9.20 The Security tab of a component s Properties dialog box
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and which roles are denied access to the interface. For our example, we want to deny access to the Clerks role. When users who are members of the Clerks role create an instance of the component that is based off the _Contact interface, they will receive an error because they do not have access to this object inside COM+. You could further restrict access down to the method level; however, since that process is similar to restricting interface security, we won t cover it here.
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Figure 9.21 An interface s Properties dialog box, open to the Security tab
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Programmatic security When you have enabled role-based security for your component, you can access roles through code inside your component. To determine if a caller has access to execute specific code within your component, check the caller s membership role. You can also access security information using the security call context object, and you can determine whether security is enabled for the current call to your component. Code within the .NET Framework looks a little different than code for Visual Basic 6.0 and previous versions. As we ve mentioned in previous chapters, all of the information regarding security (and your component s context) is contained within the ContextUtil class, which is a member of the System.EnterpriseServices namespace. Let s quickly review the properties and methods of ContextUtil. Properties The properties are as follows:
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ActivityId Returns a GUID representing the activity ID of the component ApplicationId Returns the current application s ID ApplicationInstanceId Returns a GUID for the current instance ID ContextId Returns a GUID for the current context DeactivateOnReturn Sets or returns the done bit for the COM+ context IsInTransaction Returns a Boolean indicating whether the current con-
text is executing within a transaction IsSecurityEnabled Returns a Boolean indicating whether role-based security is enabled for the context MyTransactionVote Sets or returns the consistent bit for the COM+ context PartitionId Returns a GUID for the current COM+ partition Transaction Returns an object that describes the current COM+ transaction TransactionId Returns a GUID for the current COM+ transaction
Methods Here is a list of the ContextUtil class s methods: DisableCommit Sets both the consistent and done bits to False for the context EnableCommit Sets the consistent bit to True and the done bit to False for the context GetNamedProperty Returns a named property from the context IsCallerInRole Returns a Boolean if the caller is in a given role SetAbort Sets the consistent bit to False and the done bit to True SetComplete Sets both the consistent and done bits to True 258
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