NAME

       SSL_CTX_get0_param, SSL_get0_param, SSL_CTX_set1_param, SSL_set1_param,
       SSL_CTX_set_purpose, SSL_CTX_set_trust, SSL_set_purpose, SSL_set_trust - get and set
       verification parameters

SYNOPSIS

        #include <openssl/ssl.h>

        X509_VERIFY_PARAM *SSL_CTX_get0_param(SSL_CTX *ctx);
        X509_VERIFY_PARAM *SSL_get0_param(SSL *ssl);
        int SSL_CTX_set1_param(SSL_CTX *ctx, X509_VERIFY_PARAM *vpm);
        int SSL_set1_param(SSL *ssl, X509_VERIFY_PARAM *vpm);

        int SSL_CTX_set_purpose(SSL_CTX *ctx, int purpose);
        int SSL_set_purpose(SSL *ssl, int purpose);

        int SSL_CTX_set_trust(SSL_CTX *ctx, int trust);
        int SSL_set_trust(SSL *ssl, int trust);

DESCRIPTION

       SSL_CTX_get0_param() and SSL_get0_param() retrieve an internal pointer to the verification
       parameters for ctx or ssl respectively. The returned pointer must not be freed by the
       calling application.

       SSL_CTX_set1_param() and SSL_set1_param() set the verification parameters to vpm for ctx
       or ssl.

       The functions SSL_CTX_set_purpose() and SSL_set_purpose() are shorthands which set the
       purpose parameter on the verification parameters object. These functions are equivalent to
       calling X509_VERIFY_PARAM_set_purpose() directly.

       The functions SSL_CTX_set_trust() and SSL_set_trust() are similarly shorthands which set
       the trust parameter on the verification parameters object. These functions are equivalent
       to calling X509_VERIFY_PARAM_set_trust() directly.

NOTES

       Typically parameters are retrieved from an SSL_CTX or SSL structure using
       SSL_CTX_get0_param() or SSL_get0_param() and an application modifies them to suit its
       needs: for example to add a hostname check.

RETURN VALUES

       SSL_CTX_get0_param() and SSL_get0_param() return a pointer to an X509_VERIFY_PARAM
       structure.

       SSL_CTX_set1_param(), SSL_set1_param(), SSL_CTX_set_purpose(), SSL_set_purpose(),
       SSL_CTX_set_trust() and SSL_set_trust() return 1 for success and 0 for failure.

EXAMPLES

       Check hostname matches "www.foo.com" in peer certificate:

        X509_VERIFY_PARAM *vpm = SSL_get0_param(ssl);
        X509_VERIFY_PARAM_set1_host(vpm, "www.foo.com", 0);

SEE ALSO

       ssl(7), X509_VERIFY_PARAM_set_flags(3)

HISTORY

       These functions were added in OpenSSL 1.0.2.

COPYRIGHT

       Copyright 2015-2022 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>.