NAME

       SSL_CTX_config, SSL_config - configure SSL_CTX or SSL structure

SYNOPSIS

        #include <openssl/ssl.h>

        int SSL_CTX_config(SSL_CTX *ctx, const char *name);
        int SSL_config(SSL *s, const char *name);

DESCRIPTION

       The functions SSL_CTX_config() and SSL_config() configure an SSL_CTX or SSL structure
       using the configuration name.

       By calling SSL_CTX_config() or SSL_config() an application can perform many complex tasks
       based on the contents of the configuration file: greatly simplifying application
       configuration code. A degree of future proofing can also be achieved: an application can
       support configuration features in newer versions of OpenSSL automatically.

       A configuration file must have been previously loaded, for example using
       CONF_modules_load_file(). See config(5) for details of the configuration file syntax.

RETURN VALUES

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

EXAMPLES

       If the file "config.cnf" contains the following:

        testapp = test_sect

        [test_sect]
        # list of configuration modules

        ssl_conf = ssl_sect

        [ssl_sect]
        server = server_section

        [server_section]
        RSA.Certificate = server-rsa.pem
        ECDSA.Certificate = server-ecdsa.pem
        Ciphers = ALL:!RC4

       An application could call:

        if (CONF_modules_load_file("config.cnf", "testapp", 0) <= 0) {
            fprintf(stderr, "Error processing config file\n");
            goto err;
        }

        ctx = SSL_CTX_new(TLS_server_method());

        if (SSL_CTX_config(ctx, "server") == 0) {
            fprintf(stderr, "Error configuring server.\n");
            goto err;
        }

       In this example two certificates and the cipher list are configured without the need for
       any additional application code.

SEE ALSO

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

HISTORY

       The SSL_CTX_config() and SSL_config() functions were added in OpenSSL 1.1.0.

COPYRIGHT

       Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (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>.