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.\" ========================================================================
.\"
.IX Title "SSL_CTX_GET0_PARAM 3SSL"
.TH SSL_CTX_GET0_PARAM 3SSL 2024-04-04 3.2.2-dev OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH 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
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBSSL_CTX_get0_param()\fR and \fBSSL_get0_param()\fR retrieve an internal pointer to
the verification parameters for \fBctx\fR or \fBssl\fR respectively. The returned
pointer must not be freed by the calling application.
.PP
\&\fBSSL_CTX_set1_param()\fR and \fBSSL_set1_param()\fR set the verification parameters
to \fBvpm\fR for \fBctx\fR or \fBssl\fR.
.PP
The functions \fBSSL_CTX_set_purpose()\fR and \fBSSL_set_purpose()\fR are shorthands which
set the purpose parameter on the verification parameters object. These functions
are equivalent to calling \fBX509_VERIFY_PARAM_set_purpose()\fR directly.
.PP
The functions \fBSSL_CTX_set_trust()\fR and \fBSSL_set_trust()\fR are similarly shorthands
which set the trust parameter on the verification parameters object. These
functions are equivalent to calling \fBX509_VERIFY_PARAM_set_trust()\fR directly.
.SH NOTES
.IX Header "NOTES"
Typically parameters are retrieved from an \fBSSL_CTX\fR or \fBSSL\fR structure
using \fBSSL_CTX_get0_param()\fR or \fBSSL_get0_param()\fR and an application modifies
them to suit its needs: for example to add a hostname check.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSSL_CTX_get0_param()\fR and \fBSSL_get0_param()\fR return a pointer to an
\&\fBX509_VERIFY_PARAM\fR structure.
.PP
\&\fBSSL_CTX_set1_param()\fR, \fBSSL_set1_param()\fR, \fBSSL_CTX_set_purpose()\fR,
\&\fBSSL_set_purpose()\fR, \fBSSL_CTX_set_trust()\fR and \fBSSL_set_trust()\fR return 1 for success
and 0 for failure.
.SH EXAMPLES
.IX Header "EXAMPLES"
Check hostname matches "www.foo.com" in peer certificate:
.PP
.Vb 2
\& X509_VERIFY_PARAM *vpm = SSL_get0_param(ssl);
\& X509_VERIFY_PARAM_set1_host(vpm, "www.foo.com", 0);
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(7),
\&\fBX509_VERIFY_PARAM_set_flags\fR\|(3)
.SH HISTORY
.IX Header "HISTORY"
These functions were added in OpenSSL 1.0.2.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2015\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
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>.