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The service cannot simply allow any authenticated user full access to its resources Just because certain users are authenticated does not mean that they are fully authorized to use all of the available resources Security policy and authorization are related topics because both have to do with restricting access to a Web service to only those clients that meet strict usage requirements 7 provides detailed discussions on both of these important topics For more information on security and encryption in general, and on WS-Security in particular, consult the list of excellent references in Appendix A..

echo $VAR | awk '{for(i=3; i<='$end'; i++) {printf "%s ",$i}; print ""}'

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The WS-Secure Conversation (and WS-Trust) specification provides the means for a client and a service to establish an optimized secure communication channel for a session, that is, an established duration of time. Secure conversation uses a security token that is procured by a service token provider following the initial handshake, or exchange of original security tokens, by the service and client. The security token is used to encrypt and sign all subsequent SOAP messages that are exchanged between the service and client. 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 e-commerce 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, 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 ondemand secure communication for exactly as long as it is needed.

Here is the output:

You can find the WS-Security specification at http://www-106.ibm.com/ developerworks/webservices/library/ws-secure/.

The length value in awk is another internal variable that contains the number of characters in the current line.

6

Note HTTPS and WS-Secure Conversation differ in one important way: HTTPS is not typically used for

echo $VAR | awk '{print length}'

I will close out this chapter with a look at a different kind of security issue called replay attacks. These are a type of denial-of-service (DoS) attack that is specific to Web services. A replay attack occurs when a client makes multiple Web service calls to the same service without waiting for a response from one or more previous requests. If enough of these calls are made, then it is possible to overwhelm the Web service s hosting server, and to then cause the service to become unresponsive or to go offline. Replay attacks are at best a nuisance, and at worst can cause critical system breakdowns. The WS-Security specification mentions replay attacks and briefly describes a strategy for dealing with them. The key to preventing a replay attack is for a Web service to monitor the status of incoming messages and to verify their uniqueness. The Web service needs to verify that an incoming SOAP request message is unique, and has not already been sent, before the service starts processing the message.

Here s the output:

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