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Listing 836 Principal Permission
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Using Forms Authentication All the approaches so far show how services can be accessed over the Internet from a Windows-based application Figure 88 shows a Web application that accesses services over the Internet from the browser We will now consider how Web applications can access WCF services securely using a Web-centric approach This means that we want to use standard HTTP approaches for securely accessing our services This includes using
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HTTP cookies for authentication and SSL for encryption SSL for encryption has been covered earlier in this chapter, so we will focus on the use of HTTP cookies for authentication
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Figure 88 Services over Internet with Web application
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ASPNET provides a feature known as Forms Authentication, which uses HTTP cookies for authentication Forms Authentication allows a developer to build a Web application that uses an HTML form for user login After the user types in the username and password, the form is submitted to the Web server for authentication After the user is authenticated, an HTTP cookie is sent down to the browser and used as an authentication token Successive calls from the browser can then use this token to authenticate the user By default, Forms Authentication works directly with the ASPNET Membership to perform authentication checks Using Forms Authentication and Membership, developers can write little or no code to secure their Web applications This is great for Web applications, but it does nothing to help us for WCF services Unfortunately, there is no direct integration between WCF and Forms Authentication at this time Fortunately, a simple x solves this problem Listing 837 shows a custom attribute that allows Forms Authentication to be used with a WCF service This attribute sets the principal on the current This simple thread to the principal speci ed in the current to attribute allows for access checks using work with Forms Authentication
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Listing 837 Attribute
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Listing 838 shows a service that uses the Forms Authentication attribute It should be mentioned that the attribute is intended to be used with ASPNET Compatibility mode The GameReviewService service shown in binding It allows all Listing 838 is exposed using the new users to retrieve reviews on games from the browser, but only authenticated users can add reviews This binding is used to expose WCF services using a REST/POX style endpoint It also integrates well with the ASPNET AJAX Extensions For more information about these features, refer to 13
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Listing 838 Services Using Attribute
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Logging and Auditing
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As you ve seen in this chapter, there are many options for con guring security with WCF services and client applications Given so many con guration possibilities, the ability to diagnose authentication and authorization issues is of great importance In addition, the ability to create audit trails to record the calls (whether successful or not) to the security infrastructure is critically important for many industries, such as banking and health care, and also for companies seeking to maintain compliance with SarbanesOxley and other regulatory requirements Fortunately, WCF supports an easy-to-con gure mechanism for creating logs and audit trails of the security-related activities involving services
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Security auditing can be enabled via con guration using the as shown in Listing 839
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Listing 839 Configuring a Service to Audit Security Events via
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The speci es which event log should be used for auditing; it can be Default, Application, or Security The and properties can be None, Success, Failure, or SuccessOrFailure Finally, the property can be set to true to prevent an exception from being thrown when the system fails to log an audit message options Running a service with the shown in Listing 839 will result in MessageAuthentication and ServiceAuthorization events (for both failing and successful authentications/ authorizations) being written to the system s Application log Each entry
Summar y
will contain information such as the caller identity, time, target service URI, and protocol Should any message fail to be written to the event log, an exception will be thrown By combining an auditing policy with the detailed options for message logging and system tracing described in 9, Diagnostics, you can more effectively and reliably track the behavior and usage of your WCF applications