SSL_CTX_USE_SERVERINFO - Online Linux Manual Page

Section : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMESSL_CTX_use_serverinfo_ex, SSL_CTX_use_serverinfo, SSL_CTX_use_serverinfo_file ​− use serverinfo extension
SYNOPSIS​ #include <openssl/ssl.h> ​ ​ int SSL_CTX_use_serverinfo_ex(SSL_CTX *ctx, unsigned int version, ​ const unsigned char *serverinfo, ​ size_t serverinfo_length); ​ ​ int SSL_CTX_use_serverinfo(SSL_CTX *ctx, const unsigned char *serverinfo, ​ size_t serverinfo_length); ​ ​ int SSL_CTX_use_serverinfo_file(SSL_CTX *ctx, const char *file);
DESCRIPTIONThese functions load ‟serverinfo” TLS extensions into the SSL_CTX. A ​‟serverinfo” extension is returned in response to an empty ClientHello Extension. ​SSL_CTX_use_serverinfo_ex() loads one or more serverinfo extensions from a byte array into ctx. The version parameter specifies the format of the byte array provided in *serverinfo which is of length serverinfo_length. If version is SSL_SERVERINFOV2 then the extensions in the array must consist of a 4−byte context, a 2−byte Extension Type, a 2−byte length, and then length bytes of extension_data. The context and type values have the same meaning as for SSL_CTX_add_custom_ext (3). If serverinfo is being loaded for extensions to be added to a Certificate message, then the extension will only be added for the first certificate in the message (which is always the end-entity certificate). If version is SSL_SERVERINFOV1 then the extensions in the array must consist of a 2−byte Extension Type, a 2−byte length, and then length bytes of extension_data. The type value has the same meaning as for ​SSL_CTX_add_custom_ext (3). The following default context value will be used in this case: ​ SSL_EXT_TLS1_2_AND_BELOW_ONLY | SSL_EXT_CLIENT_HELLO ​ | SSL_EXT_TLS1_2_SERVER_HELLO | SSL_EXT_IGNORE_ON_RESUMPTION ​SSL_CTX_use_serverinfo() does the same thing as SSL_CTX_use_serverinfo_ex() except that there is no version parameter so a default version of ​SSL_SERVERINFOV1 is used instead. ​SSL_CTX_use_serverinfo_file() loads one or more serverinfo extensions from ​file into ctx. The extensions must be in PEM format. Each extension must be in a format as described above for SSL_CTX_use_serverinfo_ex(). Each ​PEM extension name must begin with the phrase ‟BEGIN SERVERINFOV2 FOR ” for ​SSL_SERVERINFOV2 data or ‟BEGIN SERVERINFO FOR ” for SSL_SERVERINFOV1 data. If more than one certificate (RSA/DSA) is installed using ​SSL_CTX_use_certificate(), the serverinfo extension will be loaded into the last certificate installed. If e.g. the last item was a RSA certificate, the loaded serverinfo extension data will be loaded for that certificate. To use the serverinfo extension for multiple certificates, ​SSL_CTX_use_serverinfo() needs to be called multiple times, once after each time a certificate is loaded via a call to SSL_CTX_use_certificate().
RETURN VALUESOn success, the functions return 1. On failure, the functions return 0. Check out the error stack to find out the reason.
COPYRIGHTCopyright 2013−2017 The OpenSSL Project Authors. All Rights Reserved. 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 <https://www.openssl.org/source/license.html>. 0
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