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.\" ========================================================================
.\"
.IX Title "SSL_CTX_add_extra_chain_cert 3"
.TH SSL_CTX_add_extra_chain_cert 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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.nh
.SH "NAME"
SSL_CTX_add_extra_chain_cert, SSL_CTX_clear_extra_chain_certs \- add or clear
extra chain certificates
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& long SSL_CTX_add_extra_chain_cert(SSL_CTX *ctx, X509 *x509);
\& long SSL_CTX_clear_extra_chain_certs(SSL_CTX *ctx);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_CTX_add_extra_chain_cert()\fR adds the certificate \fBx509\fR to the extra chain
certificates associated with \fBctx\fR. Several certificates can be added one
after another.
.PP
\&\fBSSL_CTX_clear_extra_chain_certs()\fR clears all extra chain certificates
associated with \fBctx\fR.
.PP
These functions are implemented as macros.
.SH "NOTES"
.IX Header "NOTES"
When sending a certificate chain, extra chain certificates are sent in order
following the end entity certificate.
.PP
If no chain is specified, the library will try to complete the chain from the
available \s-1CA\s0 certificates in the trusted \s-1CA\s0 storage, see
\&\fBSSL_CTX_load_verify_locations\fR\|(3).
.PP
The \fBx509\fR certificate provided to \fBSSL_CTX_add_extra_chain_cert()\fR will be
freed by the library when the \fB\s-1SSL_CTX\s0\fR is destroyed. An application
\&\fBshould not\fR free the \fBx509\fR object.
.SH "RESTRICTIONS"
.IX Header "RESTRICTIONS"
Only one set of extra chain certificates can be specified per \s-1SSL_CTX\s0
structure. Different chains for different certificates (for example if both
\&\s-1RSA\s0 and \s-1DSA\s0 certificates are specified by the same server) or different \s-1SSL\s0
structures with the same parent \s-1SSL_CTX\s0 cannot be specified using this
function. For more flexibility functions such as \fBSSL_add1_chain_cert()\fR should
be used instead.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSSL_CTX_add_extra_chain_cert()\fR and \fBSSL_CTX_clear_extra_chain_certs()\fR return
1 on success and 0 for failure. Check out the error stack to find out the
reason for failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(3),
\&\fBSSL_CTX_use_certificate\fR\|(3),
\&\fBSSL_CTX_set_client_cert_cb\fR\|(3),
\&\fBSSL_CTX_load_verify_locations\fR\|(3)
\&\fBSSL_CTX_set0_chain\fR\|(3)
\&\fBSSL_CTX_set1_chain\fR\|(3)
\&\fBSSL_CTX_add0_chain_cert\fR\|(3)
\&\fBSSL_CTX_add1_chain_cert\fR\|(3)
\&\fBSSL_set0_chain\fR\|(3)
\&\fBSSL_set1_chain\fR\|(3)
\&\fBSSL_add0_chain_cert\fR\|(3)
\&\fBSSL_add1_chain_cert\fR\|(3)
\&\fBSSL_CTX_build_cert_chain\fR\|(3)
\&\fBSSL_build_cert_chain\fR\|(3)