1SSL_CTX_CONFIG(3ossl)               OpenSSL              SSL_CTX_CONFIG(3ossl)
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NAME

6       SSL_CTX_config, SSL_config - configure SSL_CTX or SSL structure
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SYNOPSIS

9        #include <openssl/ssl.h>
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11        int SSL_CTX_config(SSL_CTX *ctx, const char *name);
12        int SSL_config(SSL *s, const char *name);
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DESCRIPTION

15       The functions SSL_CTX_config() and SSL_config() configure an SSL_CTX or
16       SSL structure using the configuration name.
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18       By calling SSL_CTX_config() or SSL_config() an application can perform
19       many complex tasks based on the contents of the configuration file:
20       greatly simplifying application configuration code. A degree of future
21       proofing can also be achieved: an application can support configuration
22       features in newer versions of OpenSSL automatically.
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24       A configuration file must have been previously loaded, for example
25       using CONF_modules_load_file(). See config(5) for details of the
26       configuration file syntax.
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RETURN VALUES

29       SSL_CTX_config() and SSL_config() return 1 for success or 0 if an error
30       occurred.
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EXAMPLES

33       If the file "config.cnf" contains the following:
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35        testapp = test_sect
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37        [test_sect]
38        # list of configuration modules
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40        ssl_conf = ssl_sect
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42        [ssl_sect]
43        server = server_section
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45        [server_section]
46        RSA.Certificate = server-rsa.pem
47        ECDSA.Certificate = server-ecdsa.pem
48        Ciphers = ALL:!RC4
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50       An application could call:
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52        if (CONF_modules_load_file("config.cnf", "testapp", 0) <= 0) {
53            fprintf(stderr, "Error processing config file\n");
54            goto err;
55        }
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57        ctx = SSL_CTX_new(TLS_server_method());
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59        if (SSL_CTX_config(ctx, "server") == 0) {
60            fprintf(stderr, "Error configuring server.\n");
61            goto err;
62        }
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64       In this example two certificates and the cipher list are configured
65       without the need for any additional application code.
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SEE ALSO

68       ssl(7), config(5), SSL_CONF_cmd(3), CONF_modules_load_file(3)
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HISTORY

71       The SSL_CTX_config() and SSL_config() functions were added in OpenSSL
72       1.1.0.
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75       Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
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77       Licensed under the Apache License 2.0 (the "License").  You may not use
78       this file except in compliance with the License.  You can obtain a copy
79       in the file LICENSE in the source distribution or at
80       <https://www.openssl.org/source/license.html>.
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843.1.1                             2023-08-31             SSL_CTX_CONFIG(3ossl)
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