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Use Time Stamps for Message Verification
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Message time stamps are added to an outgoing SOAP request message by the sender. They help in detecting unauthorized SOAP message requests. The client may choose to set an expiration date and time on the request message, which means that the message is only valid for a specific number of seconds after it is issued. This ensures that if the SOAP message is intercepted and re-sent by an unauthorized sender, it will only be useful to them for a limited amount of time. And, of course, if the message expiration is set short enough, there will not be time for an unauthorized party to intercept and reroute the message. Message time stamps
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CHAPTER 7 EXTENDED WEB SERVICES SECURITY WITH WS-SECURITY AND WS-SECURE CONVERSATION
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and expiration are a useful first defense for preventing the unauthorized use of legitimate SOAP messages. As added protection, the client may digitally sign both the message body and the time stamp directly. This allows the receiving service to detect a scenario wherein the time stamp itself was tampered with and altered by an unauthorized user.
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Note SOAP message interception and tampering is a serious security issue that will become more widely
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understood (and worried about) once Web services become more commonly deployed and used by companies. If a thief steals your credit card or a document that contains your personal information, he has access to a legitimate source of credit, even though he is not an unauthorized user. SOAP message interception potentially creates the same security compromise scenario.
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Once the service receives the request message, it can cache the SoapContext while it processes the message. Subsequent incoming request messages can then be compared against the cached SoapContext objects and rejected if the service detects that the request has already been received. Recall that the SoapContext is a WSE-specific class representation of a SOAP message and is a member of the Microsoft.Web.Services3 namespace. You can use the SoapContext class to programmatically access the properties of a SOAP message, including its headers and body. There are no specific rules as to what kind of information you should use to correlate SoapContext information between messages. Basically, any unique identifying information makes for a good candidate, as long as it cannot be spoofed by an unauthorized third party. So you will want to choose a piece of information that can be digitally signed in the request message. Good candidates include addressing headers and security token IDs. In addition to addressing headers, you can correlate messages using specific contents of the SOAP message body, or any other header information that is uniquely set by the client. If the message uses a security token, the token itself can be used to uniquely identify a message.
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Use Username Token Nonce Values for Message Verification
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If you find yourself struggling to extract a unique piece of information from a message (using the SoapContext class), and the message includes a Username Token security token, you can use a nonce-based token ID as a unique identifier. A nonce is simply a random cryptographic string that can be assigned as the ID value for the Username Token security token. When the service receives a request message, it can extract the nonce value from the security token and cache the value for the duration of the request message. These ID values are part of the message signature and cannot be spoofed. And because they are nonce values, it is highly unlikely that two request messages will coincidentally share the same ID values. However, this could happen if you choose to rely on the autogenerated ID value for the security token. Again, the burden remains on the service to cache information on incoming request messages. But if you need to take this approach, a nonce value is the simplest way to do so. Listing 7-5 shows how the client can assign a nonce value to a Username Token security token.
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