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.TH CURLOPT_ISSUERCERT 3 "September 26, 2023" "ibcurl 8.4.0" libcurl

.SH NAME
CURLOPT_ISSUERCERT \- issuer SSL certificate filename
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ISSUERCERT, char *file);
.fi
.SH DESCRIPTION
Pass a char * to a null-terminated string naming a \fIfile\fP holding a CA
certificate in PEM format. If the option is set, an additional check against
the peer certificate is performed to verify the issuer is indeed the one
associated with the certificate provided by the option. This additional check
is useful in multi-level PKI where one needs to enforce that the peer
certificate is from a specific branch of the tree.

This option makes sense only when used in combination with the
\fICURLOPT_SSL_VERIFYPEER(3)\fP option. Otherwise, the result of the check is
not considered as failure.

A specific error code (CURLE_SSL_ISSUER_ERROR) is defined with the option,
which is returned if the setup of the SSL/TLS session has failed due to a
mismatch with the issuer of peer certificate (\fICURLOPT_SSL_VERIFYPEER(3)\fP
has to be set too for the check to fail). (Added in 7.19.0)

The application does not have to keep the string around after setting this
option.
.SH DEFAULT
NULL
.SH PROTOCOLS
All TLS-based protocols
.SH EXAMPLE
.nf
CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
  curl_easy_setopt(curl, CURLOPT_ISSUERCERT, "/etc/certs/cacert.pem");
  ret = curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}
.fi
.SH AVAILABILITY
If built TLS enabled
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
CURLE_OUT_OF_MEMORY if there was insufficient heap space.

.\" Oracle has added the ARC stability level to this manual page
.SH ATTRIBUTES
See
.BR attributes (7)
for descriptions of the following attributes:
.sp
.TS
box;
cbp-1 | cbp-1
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE 
=
Availability	web/curl
=
Stability	Uncommitted
.TE

.PP
.SH "SEE ALSO"
.BR CURLOPT_CRLFILE (3),
.BR CURLOPT_SSL_VERIFYHOST (3),
.BR CURLOPT_SSL_VERIFYPEER (3)

.SH NOTES

.\" Oracle has added source availability information to this manual page
Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source-code-downloads.html.

This software was built from source available at https://github.com/oracle/solaris-userland.  The original community source was downloaded from  https://curl.se/download/curl-8.4.0.tar.bz2.

Further information about this software can be found on the open source community website at http://curl.haxx.se/.