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SSL Bridging Options
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You can configure the SSL bridging options when you configure a secure Web publishing rule or you can change the Web publishing rule after the initial configuration. ISA Server supports three SSL bridging options:
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SSL bridging from ISA Server to the client A client requests an SSL object. ISA Server decrypts the request and forwards it to the Web server. The Web server returns the HTTP object to ISA Server. ISA Server encrypts the object and sends it to the client. In this scenario, SSL is used to secure only the connection between ISA Server and the client. SSL bridging from ISA Server to the Web server A client requests an HTTP object from an internal Web server. ISA Server accepts the request, encrypts it, and forwards it to the Web server. The Web server returns an encrypted object to ISA Server. Then, ISA Server decrypts the object and sends it to the client. In this
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Lesson 3
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Configuring Secure Web Publishing Rules
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scenario, SSL is used to secure only the connection between ISA Server and the Web server.
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SSL bridging from client to Web Server The client requests an SSL object. ISA Server decrypts the request, and then encrypts it again and forwards it to the Web server. The Web server returns the encrypted object to ISA Server. ISA Server decrypts the object and then encrypts it again and sends it to the client. In this scenario, SSL is used to encrypt all connections.
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How to Configure SSL Tunneling
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In an SSL tunneling scenario, ISA Server does not encrypt or decrypt packets, but simply forwards SSL packets from the client to the Web server. SSL tunneling means that ISA Server does not need to decrypt SSL packets, but it also means that the encrypted packets cannot be inspected by ISA Server.
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How SSL Tunneling Works
In SSL tunneling mode, a client can establish a tunnel through the computer running ISA Server directly to the internal Web server. In tunneling mode, the connection between the client and the Web server is encrypted. Because ISA Server does not decrypt the packet, it cannot inspect the application-layer contents of the packet. SSL tunneling can also be used in a Web publishing scenario as follows: 1. An external client uses HTTPS to request an object from a Web server located on the internal network. The request is sent to an external IP address on the ISA Server computer. 2. ISA Server checks the Web publishing rule for the request. If the rule specifies SSL tunneling mode, ISA Server forwards the request to the internal Web server without decrypting the packet. 3. The Web server responds with a server-side SSL certificate to the client and the client authenticates the server. After authentication, the client and server create a secure encryption channel. 4. The Web server then encrypts the requested object and sends it to ISA Server, which forwards it to the client.
You can configure SSL tunneling only when you initially create the secure Web publishing rule. When you configure an SSL tunneling for a secure Web publishing rule using the ISA Server Wizard, you are actually configuring a server publishing rule that uses HTTPS. For more details on this, see the section How to Publish a Web Server, later in this chapter.
Note
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Implementing ISA Server Publishing
How to Configure a New Secure Web Publishing Rule
To configure a new secure Web publishing rule, complete the following procedure: 1. To configure a secure Web publishing rule that will require the ISA Server to terminate the client SSL connection, you must first install a server certificate on the ISA Server computer. 2. After installing the server certificate, create or configure a Web listener that will listen for SSL connections. When you configure the Web listener to listen for SSL connections, you need to configure the server certificate that ISA Server will use when responding to client SSL requests. 3. In the ISA Server Management Console, click Firewall Policy. On the Tasks tab, click Publish A Secure Web Server. 4. On the Welcome To The SSL Web Publishing Rule Wizard page, in the SSL Web Publishing Rule name field, type rule name and click Next. 5. On the Publishing Mode page, shown in Figure 8-15, configure the publishing mode to use either SSL bridging or SSL tunneling.
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