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<div class="chapter">
<div class="titlepage"><div><div><h1 class="title">
<a name="intro"></a>GNU SASL Reference Manual</h1></div></div></div>
<div class="toc"><dl class="toc">
<dt>
<span class="refentrytitle"><a href="gsasl-gsasl-version.h.html">gsasl-version.h</a></span><span class="refpurpose"> — version symbols</span>
</dt>
<dt>
<span class="refentrytitle"><a href="gsasl-gsasl.h.html">gsasl.h</a></span><span class="refpurpose"> — main library interfaces</span>
</dt>
<dt>
<span class="refentrytitle"><a href="gsasl-gsasl-mech.h.html">gsasl-mech.h</a></span><span class="refpurpose"> — register new application-defined mechanism</span>
</dt>
</dl></div>
<p>
GNU SASL is an implementation of the Simple Authentication and
Security Layer (SASL) framework and a few common SASL
mechanisms. SASL is used by network servers (e.g., IMAP, SMTP,
XMPP) to request authentication from clients, and in clients to
authenticate against servers.
</p>
<p>
GNU SASL consists of a C library (libgsasl), a command-line
application (gsasl), and a manual. The library supports the
ANONYMOUS, CRAM-MD5, DIGEST-MD5, EXTERNAL, GS2-KRB5, GSSAPI,
LOGIN, NTLM, OPENID20, PLAIN, SCRAM-SHA-1, SCRAM-SHA-1-PLUS,
SCRAM-SHA-256, SCRAM-SHA-256-PLUS, SAML20, and SECURID
mechanisms.
</p>
<p>
The design of the library and the intended interaction between
applications and the library through the official API is shown
in <a class="xref" href="intro.html#abstraction" title="Figure 1. Illustration of separation between application and individual mechanism">Figure 1, “Illustration of separation between application and
individual mechanism”</a>.
</p>
<div class="figure">
<a name="abstraction"></a><p class="title"><b>Figure 1. Illustration of separation between application and
individual mechanism</b></p>
<div class="figure-contents"><div><img src="gsasl-abstraction.png" alt="Illustration of separation between application and individual mechanism"></div></div>
</div>
<br class="figure-break"><p>
The operation of an application using the library can best be
understood in terms of a flow chart diagram, as shown in <a class="xref" href="intro.html#controlflow" title="Figure 2. High-level control flow of SASL application">Figure 2, “High-level control flow of SASL application”</a>. The details on how the actual
negotiation are carried out are illustrated in <a class="xref" href="intro.html#controlflow2" title="Figure 3. Low-level control flow of SASL application">Figure 3, “Low-level control flow of SASL application”</a>.
</p>
<div class="figure">
<a name="controlflow"></a><p class="title"><b>Figure 2. High-level control flow of SASL application</b></p>
<div class="figure-contents"><div><img src="gsasl-controlflow.png" alt="High-level control flow of SASL application"></div></div>
</div>
<br class="figure-break"><div class="figure">
<a name="controlflow2"></a><p class="title"><b>Figure 3. Low-level control flow of SASL application</b></p>
<div class="figure-contents"><div><img src="gsasl-controlflow2.png" alt="Low-level control flow of SASL application"></div></div>
</div>
<br class="figure-break">
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