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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_session_ticket_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="#HISTORY">HISTORY</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>SSL_CTX_set_session_ticket_cb, SSL_SESSION_get0_ticket_appdata, SSL_SESSION_set1_ticket_appdata, SSL_CTX_generate_session_ticket_fn, SSL_CTX_decrypt_session_ticket_fn - manage session ticket application data</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/ssl.h> typedef int (SSL_CTX_generate_session_ticket_fn)(SSL s, void arg); typedef SSL_TICKET_RETURN (SSL_CTX_decrypt_session_ticket_fn)(SSL s, SSL_SESSION ss, const unsigned char keyname, size_t keyname_len, SSL_TICKET_STATUS status, void arg); int SSL_CTX_set_session_ticket_cb(SSL_CTX ctx, SSL_CTX_generate_session_ticket_fn gen_cb, SSL_CTX_decrypt_session_ticket_fn dec_cb, void arg); int SSL_SESSION_set1_ticket_appdata(SSL_SESSION ss, const void data, size_t len); int SSL_SESSION_get0_ticket_appdata(SSL_SESSION ss, void data, size_t len);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>SSL_CTX_set_set_session_ticket_cb() sets the application callbacks <b>gen_cb</b> and <b>dec_cb</b> that are used by a server to set and get application data stored with a session, and placed into a session ticket. Either callback function may be set to NULL. The value of <b>arg</b> is passed to the callbacks.</p> <p><b>gen_cb</b> is the application defined callback invoked when a session ticket is about to be created. The application can call SSL_SESSION_set1_ticket_appdata() at this time to add application data to the session ticket. The value of <b>arg</b> is the same as that given to SSL_CTX_set_session_ticket_cb(). The <b>gen_cb</b> callback is defined as type <b>SSL_CTX_generate_session_ticket_fn</b>.</p> <p><b>dec_cb</b> is the application defined callback invoked after session ticket decryption has been attempted and any session ticket application data is available. If ticket decryption was successful then the <b>ss</b> argument contains the session data. The <b>keyname</b> and <b>keyname_len</b> arguments identify the key used to decrypt the session ticket. The <b>status</b> argument is the result of the ticket decryption. See the <a>NOTES</a> section below for further details. The value of <b>arg</b> is the same as that given to SSL_CTX_set_session_ticket_cb(). The <b>dec_cb</b> callback is defined as type <b>SSL_CTX_decrypt_session_ticket_fn</b>.</p> <p>SSL_SESSION_set1_ticket_appdata() sets the application data specified by <b>data</b> and <b>len</b> into <b>ss</b> which is then placed into any generated session tickets. It can be called at any time before a session ticket is created to update the data placed into the session ticket. However, given that sessions and tickets are created by the handshake, the <b>gen_cb</b> is provided to notify the application that a session ticket is about to be generated.</p> <p>SSL_SESSION_get0_ticket_appdata() assigns <b>data</b> to the session ticket application data and assigns <b>len</b> to the length of the session ticket application data from <b>ss</b>. The application data can be set via SSL_SESSION_set1_ticket_appdata() or by a session ticket. NULL will be assigned to <b>data</b> and 0 will be assigned to <b>len</b> if there is no session ticket application data. SSL_SESSION_get0_ticket_appdata() can be called any time after a session has been created. The <b>dec_cb</b> is provided to notify the application that a session ticket has just been decrypted.</p> <h1 id="NOTES">NOTES</h1> <p>When the <b>dec_cb</b> callback is invoked, the SSL_SESSION <b>ss</b> has not yet been assigned to the SSL <b>s</b>. The <b>status</b> indicates the result of the ticket decryption. The callback must check the <b>status</b> value before performing any action, as it is called even if ticket decryption fails.</p> <p>The <b>keyname</b> and <b>keyname_len</b> arguments to <b>dec_cb</b> may be used to identify the key that was used to encrypt the session ticket.</p> <p>The <b>status</b> argument can be any of these values:</p> <dl> <dt id="SSL_TICKET_EMPTY">SSL_TICKET_EMPTY</dt> <dd> <p>Empty ticket present. No ticket data will be used and a new ticket should be sent to the client. This only occurs in TLSv1.2 or below. In TLSv1.3 it is not valid for a client to send an empty ticket.</p> </dd> <dt id="SSL_TICKET_NO_DECRYPT">SSL_TICKET_NO_DECRYPT</dt> <dd> <p>The ticket couldn't be decrypted. No ticket data will be used and a new ticket should be sent to the client.</p> </dd> <dt id="SSL_TICKET_SUCCESS">SSL_TICKET_SUCCESS</dt> <dd> <p>A ticket was successfully decrypted, any session ticket application data should be available. A new ticket should not be sent to the client.</p> </dd> <dt id="SSL_TICKET_SUCCESS_RENEW">SSL_TICKET_SUCCESS_RENEW</dt> <dd> <p>Same as <b>SSL_TICKET_SUCCESS</b>, but a new ticket should be sent to the client.</p> </dd> </dl> <p>The return value can be any of these values:</p> <dl> <dt id="SSL_TICKET_RETURN_ABORT">SSL_TICKET_RETURN_ABORT</dt> <dd> <p>The handshake should be aborted, either because of an error or because of some policy. Note that in TLSv1.3 a client may send more than one ticket in a single handshake. Therefore, just because one ticket is unacceptable it does not mean that all of them are. For this reason this option should be used with caution.</p> </dd> <dt id="SSL_TICKET_RETURN_IGNORE">SSL_TICKET_RETURN_IGNORE</dt> <dd> <p>Do not use a ticket (if one was available). Do not send a renewed ticket to the client.</p> </dd> <dt id="SSL_TICKET_RETURN_IGNORE_RENEW">SSL_TICKET_RETURN_IGNORE_RENEW</dt> <dd> <p>Do not use a ticket (if one was available). Send a renewed ticket to the client.</p> <p>If the callback does not wish to change the default ticket behaviour then it should return this value if <b>status</b> is <b>SSL_TICKET_EMPTY</b> or <b>SSL_TICKET_NO_DECRYPT</b>.</p> </dd> <dt id="SSL_TICKET_RETURN_USE">SSL_TICKET_RETURN_USE</dt> <dd> <p>Use the ticket. Do not send a renewed ticket to the client. It is an error for the callback to return this value if <b>status</b> has a value other than <b>SSL_TICKET_SUCCESS</b> or <b>SSL_TICKET_SUCCESS_RENEW</b>.</p> <p>If the callback does not wish to change the default ticket behaviour then it should return this value if <b>status</b> is <b>SSL_TICKET_SUCCESS</b>.</p> </dd> <dt id="SSL_TICKET_RETURN_USE_RENEW">SSL_TICKET_RETURN_USE_RENEW</dt> <dd> <p>Use the ticket. Send a renewed ticket to the client. It is an error for the callback to return this value if <b>status</b> has a value other than <b>SSL_TICKET_SUCCESS</b> or <b>SSL_TICKET_SUCCESS_RENEW</b>.</p> <p>If the callback does not wish to change the default ticket behaviour then it should return this value if <b>status</b> is <b>SSL_TICKET_SUCCESS_RENEW</b>.</p> </dd> </dl> <p>If <b>status</b> has the value <b>SSL_TICKET_EMPTY</b> or <b>SSL_TICKET_NO_DECRYPT</b> then no session data will be available and the callback must not use the <b>ss</b> argument. If <b>status</b> has the value <b>SSL_TICKET_SUCCESS</b> or <b>SSL_TICKET_SUCCESS_RENEW</b> then the application can call SSL_SESSION_get0_ticket_appdata() using the session provided in the <b>ss</b> argument to retrieve the application data.</p> <p>When the <b>gen_cb</b> callback is invoked, the SSL_get_session() function can be used to retrieve the SSL_SESSION for SSL_SESSION_set1_ticket_appdata().</p> <p>By default, in TLSv1.2 and below, a new session ticket is not issued on a successful resumption and therefore <b>gen_cb</b> will not be called. In TLSv1.3 the default behaviour is to always issue a new ticket on resumption. In both cases this behaviour can be changed if a ticket key callback is in use (see <a href="../man3/SSL_CTX_set_tlsext_ticket_key_cb.html">SSL_CTX_set_tlsext_ticket_key_cb(3)</a>).</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>The SSL_CTX_set_session_ticket_cb(), SSL_SESSION_set1_ticket_appdata() and SSL_SESSION_get0_ticket_appdata() functions return 1 on success and 0 on failure.</p> <p>The <b>gen_cb</b> callback must return 1 to continue the connection. A return of 0 will terminate the connection with an INTERNAL_ERROR alert.</p> <p>The <b>dec_cb</b> callback must return a value as described in <a>NOTES</a> above.</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man7/ssl.html">ssl(7)</a>, <a href="../man3/SSL_get_session.html">SSL_get_session(3)</a></p> <h1 id="HISTORY">HISTORY</h1> <p>The SSL_CTX_set_session_ticket_cb(), SSL_SESSION_set1_ticket_appdata() and SSL_SESSION_get_ticket_appdata() functions were added in OpenSSL 1.1.1.</p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2017-2020 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>