1SSL_CTX_USE_SERVERINFO(3)           OpenSSL          SSL_CTX_USE_SERVERINFO(3)
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NAME

6       SSL_CTX_use_serverinfo_ex, SSL_CTX_use_serverinfo,
7       SSL_CTX_use_serverinfo_file - use serverinfo extension
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SYNOPSIS

10        #include <openssl/ssl.h>
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12        int SSL_CTX_use_serverinfo_ex(SSL_CTX *ctx, unsigned int version,
13                                      const unsigned char *serverinfo,
14                                      size_t serverinfo_length);
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16        int SSL_CTX_use_serverinfo(SSL_CTX *ctx, const unsigned char *serverinfo,
17                                   size_t serverinfo_length);
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19        int SSL_CTX_use_serverinfo_file(SSL_CTX *ctx, const char *file);
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DESCRIPTION

22       These functions load "serverinfo" TLS extensions into the SSL_CTX. A
23       "serverinfo" extension is returned in response to an empty ClientHello
24       Extension.
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26       SSL_CTX_use_serverinfo_ex() loads one or more serverinfo extensions
27       from a byte array into ctx. The version parameter specifies the format
28       of the byte array provided in *serverinfo which is of length
29       serverinfo_length.
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31       If version is SSL_SERVERINFOV2 then the extensions in the array must
32       consist of a 4-byte context, a 2-byte Extension Type, a 2-byte length,
33       and then length bytes of extension_data. The context and type values
34       have the same meaning as for SSL_CTX_add_custom_ext(3). If serverinfo
35       is being loaded for extensions to be added to a Certificate message,
36       then the extension will only be added for the first certificate in the
37       message (which is always the end-entity certificate).
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39       If version is SSL_SERVERINFOV1 then the extensions in the array must
40       consist of a 2-byte Extension Type, a 2-byte length, and then length
41       bytes of extension_data. The type value has the same meaning as for
42       SSL_CTX_add_custom_ext(3). The following default context value will be
43       used in this case:
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45        SSL_EXT_TLS1_2_AND_BELOW_ONLY | SSL_EXT_CLIENT_HELLO
46        | SSL_EXT_TLS1_2_SERVER_HELLO | SSL_EXT_IGNORE_ON_RESUMPTION
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48       SSL_CTX_use_serverinfo() does the same thing as
49       SSL_CTX_use_serverinfo_ex() except that there is no version parameter
50       so a default version of SSL_SERVERINFOV1 is used instead.
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52       SSL_CTX_use_serverinfo_file() loads one or more serverinfo extensions
53       from file into ctx.  The extensions must be in PEM format.  Each
54       extension must be in a format as described above for
55       SSL_CTX_use_serverinfo_ex().  Each PEM extension name must begin with
56       the phrase "BEGIN SERVERINFOV2 FOR " for SSL_SERVERINFOV2 data or
57       "BEGIN SERVERINFO FOR " for SSL_SERVERINFOV1 data.
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59       If more than one certificate (RSA/DSA) is installed using
60       SSL_CTX_use_certificate(), the serverinfo extension will be loaded into
61       the last certificate installed.  If e.g. the last item was a RSA
62       certificate, the loaded serverinfo extension data will be loaded for
63       that certificate.  To use the serverinfo extension for multiple
64       certificates, SSL_CTX_use_serverinfo() needs to be called multiple
65       times, once after each time a certificate is loaded via a call to
66       SSL_CTX_use_certificate().
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RETURN VALUES

69       On success, the functions return 1.  On failure, the functions return
70       0.  Check out the error stack to find out the reason.
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73       Copyright 2013-2017 The OpenSSL Project Authors. All Rights Reserved.
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75       Licensed under the OpenSSL license (the "License").  You may not use
76       this file except in compliance with the License.  You can obtain a copy
77       in the file LICENSE in the source distribution or at
78       <https://www.openssl.org/source/license.html>.
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821.1.1l                            2021-09-15         SSL_CTX_USE_SERVERINFO(3)
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