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Microsoft Web Services Enhancements 2.0 is a software developer kit for implementing the WS-Specifications in .NET applications. It includes the Microsoft.Web.Services2 assembly, configuration tools, QuickStart application samples, and documentation. WSE is an excellent productivity tool that implements many of the important WS-Specifications. The current version of WSE does have gaps, most notably in its support for transactions. Developers will need to build some aspects of the WS-Specifications manually for now. This chapter lays the groundwork for the rest of the book, which explores several of the WS-Specifications in detail.
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Secure Web Services with WS-Security
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COMPANIES HAVE NOT widely adopted Web services technology to this point because the technology has lacked a security specification that can ensure the integrity of transmitted messages and data. The WS-Security specification is a joint effort by Microsoft, IBM, and VeriSign to address this most important issue. What do we actually mean when we talk about security In broad terms, we are talking about authentication and authorization: Authentication is the process of validating a user s identity based on credentials, or tokens. The token may be a username-password combination, or it may be based on an X.509 certificate. This certificate is a signed public key that has been issued by a certificate authority to vouch for the identity and integrity of a user. Authorization is the process of allowing access to selected resources based on a user s authenticated identity. For example, you can restrict access to a Web service s methods by specific users. Together, authentication and authorization provide for a security model by allowing you to identify users and then to give them selective access to resources. Currently, it is possible to secure SOAP communications over HTTP using the certificate-based Secure Sockets Layer (SSL) protocol. SSL provides encryption and digital signing of both SOAP messages and standard HTTP requests and responses. But SSL has two major limitations that make it unsuitable for securing Web services communications within a service-oriented application. First, SSL is designed for point-to-point communication. However, service-oriented Web services may exchange SOAP messages between two or more endpoints, and so they require a security solution that supports hops across multiple endpoints and multiple domain boundaries. Second, the SSL protocol is built on the HTTP protocol. Web services technology is transport neutral and supports message exchange across different protocols, including TCP and SMTP in addition to , HTTP. The SSL protocol is simply too limiting for Web services technology.
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The WS-Security specification is designed to overcome these limitations, and to provide an extensible security implementation that will evolve as Web services technology becomes more sophisticated.
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The prime currency in service-oriented architecture (SOA) applications are SOAP messages because they are the means by which requests are made and responses are received from Web service methods. The WS-Security specification provides a way for you to protect the integrity and confidentiality of messages and to implement authentication and authorization models in your Web services. The WS-Security specification enables you to implement the following protections in your Web service calls: Authentication: Security credentials, or tokens, may be exchanged between a client and a Web service to validate the identity of the caller. The tokens are added directly to the header of the SOAP message. Digital signing: This is the process of signing a SOAP message with a signature that is based on a security token (such as a usernamepassword combination or an X.509 certificate). Digital signing creates a cryptographic signature attached to the message that uniquely identifies the sender. The receiver can check this signature to verify the identity of the sender and the integrity of the message. A SOAP exception is raised on the receiving end if the contents of a SOAP message have been tampered with. Digital signing is especially important in an SOA architecture that includes routing, in which a single SOAP message may be routed through multiple SOAP endpoints and across multiple servers. Message integrity is essential in any Web service-based architecture, but especially so in an SOA architecture. Encryption: This is the process of hashing a SOAP message to ensure its confidentiality. A number of available encryption algorithms are available. In addition, you can encrypt a SOAP message based on an X.509 certificate. The WS-Security specification is platform independent and transport neutral, as are all of the other WS specifications. Security information is generated by the client and stored within the envelope of the SOAP request message. The Web service in turn will deserialize this information, verify its validity, and then process the requested operation. In the event that the message security does not pass verification, the Web service will return a SOAP fault back to the client. Listings 6-1 and 6-2 compare two SOAP request messages for the same Web service method. The Web service is StockTrader.asmx, and the requested method
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