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A secure conversation has the following characteristics: It is based on established security tokens, including Username Tokens 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 one 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 7-13 provides an architecture diagram for typical secure conversation solutions.

encrypted communication channel such as Secure Sockets Layer. However, SSL provides no protection if the authorized client decides to conduct a replay attack. Other protective measures are required. The strategies that are outlined in this section assume that you want to prevent replay attacks by verifying request messages for uniqueness, and by verifying that the request messages have not been tampered with.

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Standard Web service calls are stateless, and SOAP messages are inherently stateless, one-way communications. SOAP messages must therefore include extra information that tracks their uniqueness, and thereby helps the service to verify whether a request message has already been received. There are three main ways to track this information and to enable message verification and protection against replay attacks: Message timestamps (including Created and Expires) UsernameToken nonce values Message correlation (including sequence numbers) Let s consider each of these in turn, and see how they can be used to secure SOAP messages, and Web services, against replay attacks.

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In WSE 30 solutions the Web service will typically also act as the secure token service provider Figure 7-13 shows the secure token service provider as a separate third-party service in order to distinguish this functionality from that of the Web service itself A secure conversation is initiated by a client that requires an on-demand secure communication session with a Web service The session may be required for the duration of one request, or for several back-and-forth requests and responses between the client and the Web service The workflow for establishing and conducting a secure conversation as presented in Figure 7-13 typically follows four steps: 1 The client initiates the secure conversation by issuing a signed request to the STS provider for a security context token The client may sign the request with any standard security token, including Username Token and X509 certificates 2.

Message timestamps are added to an outgoing SOAP request message by the sender, either automatically or manually, depending on how the client is configured. The WSE output filters contain a specific filter called TimestampOutputFilter, which automatically applies timestamp information to outgoing SOAP messages. This filter is enabled in the pipeline by default, and you should never remove it because timestamps help in detecting unauthorized SOAP message requests, as described later. Listing 6-14 shows how the service can then retrieve the timestamp information programmatically from the message s SoapContext class. Listing 6-14. Retrieving Timestamp Information from a SOAP Request Message

Substring extraction can be performed using a built-in function of awk. The function has the following form:

using Microsoft.Web.Services2.Security; using Microsoft.Web.Services2.Security.Tokens; // Retrieve the request message SOAP context SoapContext requestContext = RequestSoapContext.Current; // Retrieve Timestamp information System.DateTime dtCreateDate = requestContext.Security.Timestamp.Created; System.DateTime dtExpirationDate = requestContext.Security.Timestamp.Expires; long dtTimeToLive = requestContext.Security.Timestamp.TtlInSeconds;// in seconds string TimestampID = requestContext.Security.Timestamp.Id;

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The STS provider verifies the integrity of the signed request It then generates a security context token and delivers it to the client The Web service itself can also act as the STS, or you can deploy the STS as a separate service The security context token is actually returned from the STS as a so-called request security token (RST) The client can then extract the security context token from the RST WSE 30 provides all of the support classes that you need to handle these tasks in code Alternatively, you can simply reconfigure an existing turnkey security scenario to implement secure conversation with no code changes required We will review how this is done in the next section, How to Implement Secure Conversation Using WSE 30 3 The client issues a secured Web service request using the security context token 4.

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