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Of course, the issue is more complex than this. When it comes to certificates, for many of us they are a necessary requirement for trusted communication. As a client, I may have all the trust in the world for a service provider, but I still need to use a digital certificate for the mechanics of signing and encrypting shared messages. I happen to be comfortable with digital certificates for most communication requirements because it represents certified trust. However, other client-service communications may be just as well off using a simpler UsernameToken security token, which is based on a simple username-password combination that gets hashed during transit. Luckily, the WSE implementation of the WS-Security specification is flexible, and you have a choice of security token types to use for conducting trusted communication. The point is that your preferred security tokens and your preferred hashing and encryption algorithms are simply a means to a bigger goal of establishing trusted communication, otherwise known in the Web services world as secure conversation. There is no single correct choice of technologies that you should always use. Instead, you need to be using those technologies that are appropriate for establishing a trusted, secure conversation between a given client and Web service. The rules can change depending on who is doing the communicating. This chapter focuses on how you establish session-oriented, trusted communications using the WS-Secure Conversation specification. The great thing about the WS-Specifications is that many of the concepts complement each other and build on each other. The understanding that you now have about WS-Security and WSPolicy will translate directly into the concepts behind WS-Secure Conversation. By the end of this chapter, you will have a good understanding of what constitutes secure conversation, and a broader appreciation for the usefulness of the WS-Security family of specifications.
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Overview of Secure Conversation
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The WS-Secure Conversation (and WS-Trust) specifications provide the means for a client and a service to establish an optimized secure communication channel for a limited duration of time. Secure conversation is based on security tokens that are procured by a service token provider. This process involves an initial amount of overhead, but once the channel is established, the client and service exchange a lightweight, signed security context token, which optimizes message delivery times compared with using regular security tokens. The security context token enables the same signing and encryption features that you are used to with regular security tokens. Secure conversation is analogous to communications over the HTTPS protocol. HTTPS establishes a secure channel for the duration of a session, and ceases to be in effect once that session is over. The classic example is an eCommerce
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Establish Trusted Communication with WS-Secure Conversation
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transaction, in which you browse a catalog over an unsecured channel, but then you establish a secure channel for the purpose of completing a sales transaction with the vendor. The communication needs to be secure because sensitive payment and order information is being exchanged, and so the client and the vendor need to establish a secured channel for as long as it takes to complete the transaction. For performance reasons, the client does not need or even want to establish a continuous secure session for every interaction with the vendor. HTTPS is useful for providing on-demand secure communication for exactly as long as it is needed.
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HTTPS and WS-Secure Conversation differ in one important way: HTTPS is not typically used for client authentication, whereas secure conversation is.
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A secure conversation has the following characteristics: It is based on established security tokens, including UsernameTokens and X.509 certificates. It uses a dedicated service token provider to generate a signed service context token, which is a lightweight security proxy. It provides a secure communication channel for the duration of the session. It provides optimized performance for session-oriented communications with multiple round-trips (by using the security context token). The difference between secure conversation and standard secure message exchange (with WS-Security and WS-Policy) is that a standard security policy framework establishes a fixed security policy that all service clients must adhere to. However, secure conversation has a more dynamic aspect. The client and service can initiate a secure channel as needed, rather than based on an established policy framework. Secure conversation uses security tokens that are issued for the purpose of a specific communication. The service itself can act as the provider of these security tokens. Alternatively, this responsibility can be offloaded to a thirdparty service token provider, which is a dedicated resource that acts as a trusted intermediary between clients and services, and the issuer of security tokens for their secure conversations. Figure 8-1 provides an architecture diagram for typical secure conversation solutions.
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