Transport-Level Security in .NET

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Transport-level security, as its name implies, provides security in the communication channel between the client and the service Security at this level can include both encryption and authentication The channel stack (binding) determines the types of encryption and authentication protocols available At a minimum, transport-level security ensures that communication is encrypted between the client and the service so that only the client or service can understand the messages exchanged The speci c algorithm used for encryption is either a function of the underlying protocol (HTTPS uses SSL, for example) or it can be speci ed in the binding (MSMQ can use RC4Stream or AES) In addition to encryption, transport-level security can include client authentication by requiring credentials to be passed from the client to the service when establishing the communication channel Credentials may be digital certi cates, SAML tokens, Windows tokens, or a shared secret such as a username and password Transport-level security also validates the
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service identity before establishing a secure channel between client and service This validation protects against man-in-the-middle and spoo ng attacks
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Encryption Using SSL SSL is a convenient, secure way to encrypt communications It s well understood by IT organizations, it is rewall friendly, and there are many management and performance tools on the market Using SSL with enables the broadest reach of a secure Web service SSL requires a digital certi cate with an asymmetrical (public/private) key to establish an encrypted pathway After it is established, SSL uses this pathway, with a more ef cient symmetric encryption algorithm, to encrypt messages going both ways on the channel A digital certi cate can be obtained from a number of sources There are public entities, such as Verisign, that issue certi cates for testing and production purposes Windows Server itself ships with a certi cate issuing service, so you can generate your own certi cates that can be trusted by your organization or partners In addition, NET ships with a utility, MakeCert, which generates certi cates for testing purposes
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SSL can be applied to most transport protocols (a notable exception being queued transports), but it is most commonly used with HTTP When using a binding based on the HTTP transport, whether you re hosting the services in IIS or self-hosting in another process, HTTPSYS must be con gured for SSL For IIS, you can add the binding using the IIS Administration tool For IIS 7, this is done by selecting the Web site under which the virtual root is de ned, and then selecting the Bindings link in the Actions pane This will launch a dialog from which you can select the certi cate to use for SSL communications (see Figure 81) For self-hosting a service on Windows Server 2008 or Vista, you can use the netsh tool Listing 83 shows the command line to con gure HTTPSYS to allow SSL traf c on port 8001 Specifying IP address 0000 indicates all IP addresses The 40-digit hex number is the thumbprint of a certi cate
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installed on the machine The thumbprint can be found by using the Certi cates Add-In in the Microsoft Management Console and viewing the certi cate details The nal GUID is an application identi er, representing who enabled this access Any GUID that you generate is acceptable here and will be associated with your application
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Figure 81 Configuring IIS 7 for SSL
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to Configure HTTPSYS to Allow SSL on Different Ports
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After you ve registered the certi cate with HTTPSYS, you can then con gure a service to use SSL encryption Listing 84 shows a service con gubinding, transport-level ration le that is using the
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encryption, and no client authentication Note that two base addresses are speci ed in this self-hosted con guration le, one for encrypted and one for non-encrypted communication This enables the MEX endpoint to use a non-encrypted channel and the subsequent communication to be encrypted If you don t want to expose a MEX endpoint, or if it is okay to expose it on a secure channel, you don t need the non-encrypted address
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