114 lines
4.5 KiB
HTML
Executable File
114 lines
4.5 KiB
HTML
Executable File
<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>SSL_CTX_set_max_cert_list</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#synopsis">SYNOPSIS</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#notes">NOTES</a></li>
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<li><a href="#return_values">RETURN VALUES</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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</ul>
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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>SSL_CTX_set_max_cert_list, SSL_CTX_get_max_cert_list, SSL_set_max_cert_list, SSL_get_max_cert_list - manipulate allowed size for the peer's certificate chain</p>
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<p>
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</p>
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<hr />
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<h1><a name="synopsis">SYNOPSIS</a></h1>
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<pre>
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#include <openssl/ssl.h></pre>
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<pre>
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long SSL_CTX_set_max_cert_list(SSL_CTX *ctx, long size);
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long SSL_CTX_get_max_cert_list(SSL_CTX *ctx);</pre>
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<pre>
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long SSL_set_max_cert_list(SSL *ssl, long size);
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long SSL_get_max_cert_list(SSL *ctx);</pre>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p><code>SSL_CTX_set_max_cert_list()</code> sets the maximum size allowed for the peer's
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certificate chain for all SSL objects created from <strong>ctx</strong> to be <size> bytes.
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The SSL objects inherit the setting valid for <strong>ctx</strong> at the time
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<em>SSL_new(3)</em> is being called.</p>
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<p><code>SSL_CTX_get_max_cert_list()</code> returns the currently set maximum size for <strong>ctx</strong>.</p>
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<p><code>SSL_set_max_cert_list()</code> sets the maximum size allowed for the peer's
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certificate chain for <strong>ssl</strong> to be <size> bytes. This setting stays valid
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until a new value is set.</p>
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<p><code>SSL_get_max_cert_list()</code> returns the currently set maximum size for <strong>ssl</strong>.</p>
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<p>
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</p>
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<hr />
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<h1><a name="notes">NOTES</a></h1>
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<p>During the handshake process, the peer may send a certificate chain.
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The TLS/SSL standard does not give any maximum size of the certificate chain.
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The OpenSSL library handles incoming data by a dynamically allocated buffer.
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In order to prevent this buffer from growing without bounds due to data
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received from a faulty or malicious peer, a maximum size for the certificate
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chain is set.</p>
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<p>The default value for the maximum certificate chain size is 100kB (30kB
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on the 16bit DOS platform). This should be sufficient for usual certificate
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chains (OpenSSL's default maximum chain length is 10, see
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<em>SSL_CTX_set_verify(3)</em>, and certificates
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without special extensions have a typical size of 1-2kB).</p>
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<p>For special applications it can be necessary to extend the maximum certificate
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chain size allowed to be sent by the peer, see e.g. the work on
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"Internet X.509 Public Key Infrastructure Proxy Certificate Profile"
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and "TLS Delegation Protocol" at <a href="http://www.ietf.org/">http://www.ietf.org/</a> and
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<a href="http://www.globus.org/">http://www.globus.org/</a> .</p>
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<p>Under normal conditions it should never be necessary to set a value smaller
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than the default, as the buffer is handled dynamically and only uses the
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memory actually required by the data sent by the peer.</p>
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<p>If the maximum certificate chain size allowed is exceeded, the handshake will
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fail with a SSL_R_EXCESSIVE_MESSAGE_SIZE error.</p>
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<p>
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</p>
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<hr />
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<h1><a name="return_values">RETURN VALUES</a></h1>
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<p><code>SSL_CTX_set_max_cert_list()</code> and <code>SSL_set_max_cert_list()</code> return the previously
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set value.</p>
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<p><code>SSL_CTX_get_max_cert_list()</code> and <code>SSL_get_max_cert_list()</code> return the currently
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set value.</p>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><em>ssl(7)</em>, <em>SSL_new(3)</em>,
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<em>SSL_CTX_set_verify(3)</em></p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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</body>
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</html>
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