Reading the Identity of the Caller in .NET framework

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Reading the Identity of the Caller
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To get information about the callers of the serviced component, you can access the security call context by using the class SecurityCallContext Table 12-3 shows the members of this class
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Table 12-3 SecurityCallContext Class
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SecurityCallContext Member CurrentCall Description CurrentCall is a static property that returns an instance of the SecurityCallContext class IsSecurityEnabled NumCallers IsSecurityEnabled returns true if security is enabled NumCallers returns the number of callers that are in the call chain to the serviced component DirectCaller The DirectCaller property returns a Security-Identity object that represents the direct caller of the serviced component OriginalCaller The property OriginalCaller returns a Security-Identity object of the user identity that was the first in the call chain to instantiate a method that finally arrived with the security context of the current serviced component Callers The Callers property returns an instance of the class SecurityCallers SecurityCallers is a collection class that contains allSecurityIdentity objects that are used in the call chain The Callers property includes the original and direct callers and all identities that are in between the original and direct callers MinAuthenticationLevel The MinAuthenticationLevel property returns the authentication level that is defined with the security call context The possible authentication levels were shown earlier in this chapter IsCallerInRole The method IsCallerInRole requires a string parameter to pass a role IsCallerInRole returns true if the direct caller user identity is in the role that is passed with this method SecurityCall-ContextCurrentCallIsCallerInRole("role") can be used rather than ContextUtilIsCaller-InRole("role") IsUserInRole With the method IsUserInRole, you can pass any username to check whether this user is in the defined role
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Enterprise Services and NET Remoting
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[13] When you use NET Enterprise Services in conjunction with NET remoting and Windows Server 2003, the full COM+ security is available [14] Before installing the Enterprise Services application with NET remoting, you must install a certificate with IIS, because security with NET remoting is only possible with the HTTPS protocol You can enable NET remoting with the Enterprise Services application by using the SoapVRoot property with the class ApplicationActivationAttribute: [assembly: ApplicationActivation(ActivationOptionServer, SoapVRoot="SecurityDemo")]
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[15] Registering the Enterprise Services application with the SOAP option creates a virtual Web site With the security option enabled, the Web site is configured to use HTTPS You can verify this by starting the IIS Manager, selecting Properties with the new Web site in the tree view, opening the Directory Security tab, and then clicking the button Edit in the section Secure Communication Figure 12-15 shows the dialog box to enable secure communication with IIS Manager
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Figure 12-15 Enabling secure communication with IIS
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By default, anonymous access is disabled Now you can create an application proxy to be installed on the client systems The application proxy automatically uses the HTTPS protocol to access the serviced component
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Summary
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This chapter covered several security aspects In this chapter, you have seen that you cannot deal with security aspects of serviced components without security configuration of surrounding technologies With ASPNET Web applications, you have seen Windows- and Forms-based authentication mechanisms Because Web services do not offer a user interface for the client, authentication via SOAP headers was discussed With the Enterprise Services application, you have seen how to configure a role-based security that allows defining different access to components, interfaces, and methods Impersonation and delegation allow accessing resources with the same identity of the caller The authentication level settings make it possible to encrypt the data that is sent across the network
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DCOM and NET remoting are discussed in 5, "Networking" You can download this utility from the MSDN Web site at http://supportmicrosoftcom/defaultaspx scid=KB;enus;329290 For this feature, you must install the hotfix 329250:http://supportmicrosoftcom/defaultaspx scid=KB;enus;329250 This tool is available with the Administrative Tools In the screenshot, this is the account IUSR_AMERIGO The Web site of Verisign is http://wwwverisigncom NET 20 allows for cookieless Forms authentication The book examples are based on WSE 20, a technology that supports Web services specifications This technology will be replaced by a new communications architecture (codename Indigo) sometime before the release of the Windows operating system codenamed Longhorn Indigo is discussed in 14, "The Future of Distributed Applications" You can download this toolkit fromhttp://msdnmicrosoftcom/webservices The COMAdmin COM component is discussed in 13, "Deployment and Configuration" The class ContextUtil is discussed in 2, "Object Activation and Contexts" Changing these settings is shown in 13 Read 5 for more information about NET remoting Installing certificates with IIS is discussed earlier in this chapter Serviced components that use NET remoting must also be installed in the global assembly cache
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