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authorNikos Mavrogiannopoulos <nmav@gnutls.org>2016-09-11 10:34:21 +0200
committerNikos Mavrogiannopoulos <nmav@gnutls.org>2016-09-11 10:50:54 +0200
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-<a name="Channel-Bindings"></a>
-<div class="header">
-<p>
-Next: <a href="Interoperability.html#Interoperability" accesskey="n" rel="next">Interoperability</a>, Previous: <a href="Deriving-keys-for-other-applications_002fprotocols.html#Deriving-keys-for-other-applications_002fprotocols" accesskey="p" rel="prev">Deriving keys for other applications/protocols</a>, Up: <a href="Advanced-topics.html#Advanced-topics" accesskey="u" rel="up">Advanced topics</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
-</div>
-<hr>
-<a name="Channel-bindings"></a>
-<h4 class="subsection">6.12.6 Channel bindings</h4>
-<a name="index-channel-bindings"></a>
-
-<p>In user authentication protocols (e.g., EAP or SASL mechanisms) it is
-useful to have a unique string that identifies the secure channel that
-is used, to bind together the user authentication with the secure
-channel. This can protect against man-in-the-middle attacks in some
-situations. That unique string is called a &ldquo;channel binding&rdquo;. For
-background and discussion see [<em>RFC5056</em>].
-</p>
-<p>In <acronym>GnuTLS</acronym> you can extract a channel binding using the
-<a href="Core-TLS-API.html#gnutls_005fsession_005fchannel_005fbinding">gnutls_session_channel_binding</a> function. Currently only the
-type <code>GNUTLS_CB_TLS_UNIQUE</code> is supported, which corresponds to
-the <code>tls-unique</code> channel binding for TLS defined in
-[<em>RFC5929</em>].
-</p>
-<p>The following example describes how to print the channel binding data.
-Note that it must be run after a successful TLS handshake.
-</p>
-<div class="example">
-<pre class="example">{
- gnutls_datum_t cb;
- int rc;
-
- rc = gnutls_session_channel_binding (session,
- GNUTLS_CB_TLS_UNIQUE,
- &amp;cb);
- if (rc)
- fprintf (stderr, &quot;Channel binding error: %s\n&quot;,
- gnutls_strerror (rc));
- else
- {
- size_t i;
- printf (&quot;- Channel binding 'tls-unique': &quot;);
- for (i = 0; i &lt; cb.size; i++)
- printf (&quot;%02x&quot;, cb.data[i]);
- printf (&quot;\n&quot;);
- }
-}
-</pre></div>
-
-
-
-
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-</html>