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.IX Title "SSL_CTX_get0_param 3"
.TH SSL_CTX_get0_param 3 2019-12-20 1.0.2u OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH NAME
SSL_CTX_get0_param, SSL_get0_param, SSL_CTX_set1_param, SSL_set1_param \-
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)
.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.
.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 EXAMPLE
.IX Header "EXAMPLE"
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 "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 and \fBSSL_set1_param()\fR return 1 for success and 0
for failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBX509_VERIFY_PARAM_set_flags\fR\|(3)
.SH HISTORY
.IX Header "HISTORY"
These functions were first added to OpenSSL 1.0.2.