c# wpf print barcode Infrastructure Security in C#.NET

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Infrastructure Security
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It is in the rest of the values that the algorithm suites differ. Table 7-5 lists some of the other differences.
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Table 7-5
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Algorithm Suites and Distinguishing Values
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Digest Sha1 Sha1 Sha1 Sha1 Sha1 Sha1 Sha1 Sha1 Sha256 Sha256 Sha256 Sha256 Sha256 Sha256 Sha256 Sha256 Encryption Type Aes128 Aes256 Aes192 TripleDes Aes256 Aes192 Aes128 TripleDes Aes256 Aes192 Aes128 TripleDes Aes256 Aes192 Aes128 TripleDes Minimum Symmetric Key Length 128 256 192 192 256 192 128 192 256 192 128 192 256 192 128 192
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Value Basic128 Basic256 Basic192 TripleDes Basic256Rsa15 Basic192Rsa15 Basic128Rsa15 TripleDesRsa15 Basic256Sha256 Basic192Sha256 Basic128Sha256 TripleDesSha256 Basic256Sha256Rsa15 Basic192Sha256Rsa15 Basic128Sha256Rsa15 TripleDesSha256Rsa15
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The purpose for specifying a specific type of algorithm suite is typically for interoperability purposes. The default value of Basic256 is generally sufficient for communications between most WCF endpoints. However, a different algorithm suite is used when sending messages to external clients who, for whatever reason, require a different set of properties. To reinforce this fact, the algorithmSuite attribute is valid for the following bindings only: basicHttpBinding basicHttpContextBinding netMsmqBinding netTcpBinding netTcpContextBinding wsDualHttpBinding wsFederationHttpBinding wsHttpBinding
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Lesson 2: Message-Level Security
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ws2007FederationHttpBinding ws2007HttpBinding The named pipe bindings are missing from this list. That is because named pipes are an onmachine protocol. Because you won t use named pipes to send messages to a remote machine, there is no reason to vary from the default algorithm suite.
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establishSecurityContext Attribute
The underlying purpose of the establishSecurityContext attribute is to determine whether a secure conversation is established between the client and the service before any application messages are exchanged. The secure conversation used in WCF is WS-SecureConversation. WS-SecureConversation is a Web service standard aimed at building a mechanism through which messages can be exchanged in a secure manner. It is based on the WS-Security standard to provide authentication of the message, and the underlying premise is that, although messagelevel authentication is fine for single or one-way messages, if the client and service wish to exchange multiple messages, a more efficient approach is required. Specifically, a security context could be established between the two parties. This context (called a Security Context Token, or SCT) could then be used to authenticate the messages. By default, the establishSecurityContext attribute is set to true. The basic assumption is that multiple messages will be sent along the WCF communications channel. The only reason to change the value is if you are sure the channel will be used only a single time, such as in the case of a one-time or one-way message. The establishSecurityContext attribute is valid only in the following bindings: wsHttpBinding wsHttpContextBinding ws2007HttpBinding
negotiateServiceCredential Attribute
For message security to occur, a form of mutual authentication must take place. Although this is a Boolean value, more than two scenarios are possible. First, if the attribute value is set to true, the service credentials are handled automatically through a negotiation process. The protocol used for this negotiation is called Windows Services SP Negotiation (SPNEGO). The details of the protocol are actually tunneled through a series of SOAP messages for maximum interoperability. The result of this negotiation is that the certificate associated with the service is given to the client as part of this negotiation and initialization process. If the attribute is set to false, there are a couple of possibilities. If the clientCredentialType is set to None, UserName, or Certificate, the expectation is that the service s certificate will be available
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Infrastructure Security
in a certificate store that is accessible from the client. In a case such as this, the service behavior must define the location of the service certification. The following configuration segment shows an example of how this can be accomplished:
<behavior name="MyBehavior"> <serviceCredentials> <serviceCertificate x509FindType="FindBySubjectName" findValue="ServiceCertificateSubject" storeLocation="LocalMachine" storeName="My"/> </serviceCredentials> </behavior>
8 covers the details of the serviceCertificate element. The final scenario is when the negotiateServiceCredential attribute is set to false and the clientCredentialType is set to Windows. This means that Kerberos-based authentication will take place. Although this is convenient, it does have one significant impact on the deployment model. The client and service must be part of the same Kerberos domain. Regardless of the binding (the Kerberos token is compatible with SOAP-based protocols), the token must be authenticated against the same domain. Exam Tip
This type of detail (when Kerberos can and can t be used) is the sort of tricky question frequently found in certification questions. It s not truly a trick in that the required knowledge is quite legitimate. However, it is a small detail that is easily overlooked among a number of other requirements. If faced with a question about why a client might not be able to authenticate with a service, one of the first possibilities that should come to mind is that Kerberos across different AD DS domains could be the culprit.
The negotiateSecurityContext attribute is valid in the following bindings only: wsDualHttpBinding wsFederationHttpBinding wsHttpBinding wsHttpContextBinding ws2007FederationHttpBinding ws2007HttpBinding
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