2007-06-17 11:19:18 +00:00
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
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<html>
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<head>
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2007-06-17 11:19:18 +00:00
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<meta HTTP-EQUIV="Content-Type" CONTENT="text/html;CHARSET=iso-8859-1">
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<meta name="keywords" content="Virtual Screen, Open Source, Software" />
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<meta name="description" content="Mouse and Keyboard Sharing" />
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<link rel="stylesheet" type="text/css" href="synergy.css" media="screen" />
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<title>Synergy Network Security Guide</title>
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</head>
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<body class="main">
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<p>
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2007-06-17 11:19:18 +00:00
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</p><h3>Authentication and Encryption</h3><p>
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Synergy does not do any authentication or encryption. Any computer
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can connect to the synergy server if it provides a screen name known
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to the server, and all data is transferred between the server and the
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clients unencrypted which means that anyone can, say, extract the
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key presses used to type a password. Therefore, synergy should not
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be used on untrusted networks.
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</p><p>
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However, there are tools that can add authentication and encryption
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to synergy without modifying either those tools or synergy. One
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such tool is SSH (which stands for secure shell). A free implementation
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of SSH is called <a target="_top" href="http://www.openssh.com/">OpenSSH</a> and runs
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on Linux, many Unixes, and Windows (in combination with
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<a target="_top" href="http://www.cygwin.com/">Cygwin</a>).
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</p><p>
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</p><h3>Configuring the Server</h3><p>
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Install the OpenSSH server on the same computer as the synergy server.
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Configure the OpenSSH server as usual (synergy doesn't demand any
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special options in OpenSSH) and start it. Start the synergy server as
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usual; the synergy server requires no special options to work with
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OpenSSH.
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</p><p>
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</p><h3>Configuring the Clients</h3><p>
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Install the OpenSSH client on each synergy client computer. Then, on
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each client, start the OpenSSH client using port forwarding:
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<pre>
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ssh -f -N -L 24800:<span class="arg">server-hostname</span>:24800 <span class="arg">server-hostname</span>
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</pre>
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The <span class="arg">server-hostname</span> is the name or address
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of the computer with the OpenSSH and synergy servers.
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The 24800 is the default network port used by synergy; if you use
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a different port then replace both instances of 24800 with the port
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number that you use. Finally, start the synergy client normally
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except use <span class="code">localhost</span> as the server host
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name. For example:
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<pre>
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synergyc -f localhost
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</pre>
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Synergy will then run normally except all communication is passed
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through OpenSSH which decrypts/encrypts it on behalf of synergy.
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</p>
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</body>
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2007-06-17 11:19:18 +00:00
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2004-08-01 16:00:18 +00:00
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</html>
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