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<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>SSL_CTX_set_cert_cb</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <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="#SEE-ALSO">SEE ALSO</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>SSL_CTX_set_cert_cb, SSL_set_cert_cb - handle certificate callback function</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/ssl.h> void SSL_CTX_set_cert_cb(SSL_CTX *c, int (*cert_cb)(SSL *ssl, void *arg), void *arg); void SSL_set_cert_cb(SSL *s, int (*cert_cb)(SSL *ssl, void *arg), void *arg); int (*cert_cb)(SSL *ssl, void *arg);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>SSL_CTX_set_cert_cb() and SSL_set_cert_cb() sets the cert_cb() callback, <b>arg</b> value is pointer which is passed to the application callback.</p> <p>When cert_cb() is NULL, no callback function is used.</p> <p>cert_cb() is the application defined callback. It is called before a certificate will be used by a client or server. The callback can then inspect the passed <b>ssl</b> structure and set or clear any appropriate certificates. If the callback is successful it <b>MUST</b> return 1 even if no certificates have been set. A zero is returned on error which will abort the handshake with a fatal internal error alert. A negative return value will suspend the handshake and the handshake function will return immediately. <a href="../man3/SSL_get_error.html">SSL_get_error(3)</a> will return SSL_ERROR_WANT_X509_LOOKUP to indicate, that the handshake was suspended. The next call to the handshake function will again lead to the call of cert_cb(). It is the job of the cert_cb() to store information about the state of the last call, if required to continue.</p> <h1 id="NOTES">NOTES</h1> <p>An application will typically call SSL_use_certificate() and SSL_use_PrivateKey() to set the end entity certificate and private key. It can add intermediate and optionally the root CA certificates using SSL_add1_chain_cert().</p> <p>It might also call SSL_certs_clear() to delete any certificates associated with the <b>SSL</b> object.</p> <p>The certificate callback functionality supersedes the (largely broken) functionality provided by the old client certificate callback interface. It is <b>always</b> called even is a certificate is already set so the callback can modify or delete the existing certificate.</p> <p>A more advanced callback might examine the handshake parameters and set whatever chain is appropriate. For example a legacy client supporting only TLSv1.0 might receive a certificate chain signed using SHA1 whereas a TLSv1.2 or later client which advertises support for SHA256 could receive a chain using SHA256.</p> <p>Normal server sanity checks are performed on any certificates set by the callback. So if an EC chain is set for a curve the client does not support it will <b>not</b> be used.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>SSL_CTX_set_cert_cb() and SSL_set_cert_cb() do not return values.</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man7/ssl.html">ssl(7)</a>, <a href="../man3/SSL_use_certificate.html">SSL_use_certificate(3)</a>, <a href="../man3/SSL_add1_chain_cert.html">SSL_add1_chain_cert(3)</a>, <a href="../man3/SSL_get_client_CA_list.html">SSL_get_client_CA_list(3)</a>, <a href="../man3/SSL_clear.html">SSL_clear(3)</a>, <a href="../man3/SSL_free.html">SSL_free(3)</a></p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2014-2018 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). 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> </body> </html>