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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>OpenConnect VPN client.</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="description" content="VPN client compatible with Cisco AnyConnect SSL VPN" />
<meta name="keywords" content="OpenConnect, AnyConnect, Cisco, VPN, SSLVPN, SSL VPN" />
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<body>
<div id="logo" align="right">
<img src="images/openconnect.png" height="96px" alt="OpenConnect" />
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<div id="menu1">
<span class="sel">
<a href="index.html"><span>Home</span></a>
</span>
<span class="nonsel">
<a href="features.html"><span>Features</span></a>
</span>
<span class="nonsel">
<a href="building.html"><span>Getting Started</span></a>
</span>
<span class="nonsel">
<a href="mail.html"><span>Mailing List / Help</span></a>
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<span class="nonsel">
<a href="contribute.html"><span>Contribute</span></a>
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<span class="nonsel">
<a href="technical.html"><span>Technical stuff</span></a>
</span>
<p>OpenConnect VPN client</p>
</div>
<div id="menu2">
<span class="sel">
<a href="index.html"><span>About</span></a>
</span>
<span class="nonsel">
<a href="platforms.html"><span>Supported Platforms</span></a>
</span>
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<a href="download.html"><span>Download</span></a>
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<a href="packages.html"><span>Packages</span></a>
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<h1>OpenConnect</h1>
<p>OpenConnect is a client for Cisco's <a href="http://www.cisco.com/en/US/netsol/ns1049/index.html">AnyConnect SSL VPN</a>, which is supported by the ASA5500 Series, by IOS 12.4(9)T or later on Cisco SR500, 870, 880, 1800, 2800, 3800, 7200 Series and Cisco 7301 Routers, and probably others.</p>
<p>OpenConnect is released under the GNU Lesser Public License, version 2.1.</p>
<p>Like <a href="http://www.unix-ag.uni-kl.de/~massar/vpnc/">vpnc</a>,
OpenConnect is not officially supported by, or associated in any way
with, Cisco Systems. It just happens to interoperate with their
equipment.
</p>
<p>Development of OpenConnect was started after a trial of their "official"
client under Linux found it to have many deficiencies:</p>
<ul>
<li>Inability to use SSL certificates from a <a href="http://en.wikipedia.org/wiki/Trusted_Platform_Module">TPM</a>, or even use a passphrase.</li>
<li>Lack of support for Linux platforms other than i386.</li>
<li>Lack of integration with NetworkManager on the Linux desktop.</li>
<li>Lack of proper (RPM/DEB) packaging for Linux distributions.</li>
<li>"Stealth" use of libraries with <tt>dlopen()</tt>, even using
the development-only symlinks such as <tt>libz.so</tt> —
making it hard to properly discover the dependencies which
proper packaging would have expressed</li>
<li>Tempfile races allowing unprivileged users to trick it into overwriting arbitrary files, as root.</li>
<li>Unable to run as an unprivileged user, which would have reduced the severity of the above bug.</li>
<li>Inability to audit the source code for further such "Security 101" bugs.</li>
</ul>
<p>Naturally, OpenConnect addresses all of the above issues, and more.
</p>
</div>
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