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<title>SSL_CTX_config</title>
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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#NOTES">NOTES</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#EXAMPLES">EXAMPLES</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#HISTORY">HISTORY</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<h1 id="NAME">NAME</h1>

<p>SSL_CTX_config, SSL_config - configure SSL_CTX or SSL structure</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/ssl.h&gt;

 int SSL_CTX_config(SSL_CTX *ctx, const char *name);
 int SSL_config(SSL *s, const char *name);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>The functions SSL_CTX_config() and SSL_config() configure an <b>SSL_CTX</b> or <b>SSL</b> structure using the configuration <b>name</b>.</p>

<h1 id="NOTES">NOTES</h1>

<p>By calling SSL_CTX_config() or SSL_config() an application can perform many complex tasks based on the contents of the configuration file: greatly simplifying application configuration code. A degree of future proofing can also be achieved: an application can support configuration features in newer versions of OpenSSL automatically.</p>

<p>A configuration file must have been previously loaded, for example using CONF_modules_load_file(). See <a href="../man5/config.html">config(5)</a> for details of the configuration file syntax.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>SSL_CTX_config() and SSL_config() return 1 for success or 0 if an error occurred.</p>

<h1 id="EXAMPLES">EXAMPLES</h1>

<p>If the file &quot;config.cnf&quot; contains the following:</p>

<pre><code> testapp = test_sect

 [test_sect]
 # list of configuration modules

 ssl_conf = ssl_sect

 [ssl_sect]
 server = server_section

 [server_section]
 RSA.Certificate = server-rsa.pem
 ECDSA.Certificate = server-ecdsa.pem
 Ciphers = ALL:!RC4</code></pre>

<p>An application could call:</p>

<pre><code> if (CONF_modules_load_file(&quot;config.cnf&quot;, &quot;testapp&quot;, 0) &lt;= 0) {
     fprintf(stderr, &quot;Error processing config file\n&quot;);
     goto err;
 }

 ctx = SSL_CTX_new(TLS_server_method());

 if (SSL_CTX_config(ctx, &quot;server&quot;) == 0) {
     fprintf(stderr, &quot;Error configuring server.\n&quot;);
     goto err;
 }</code></pre>

<p>In this example two certificates and the cipher list are configured without the need for any additional application code.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man5/config.html">config(5)</a>, <a href="../man3/SSL_CONF_cmd.html">SSL_CONF_cmd(3)</a>, <a href="../man3/CONF_modules_load_file.html">CONF_modules_load_file(3)</a></p>

<h1 id="HISTORY">HISTORY</h1>

<p>The SSL_CTX_config() and SSL_config() functions were added in OpenSSL 1.1.0.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2015-2019 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


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