CURLOPT_ISSUERCERT(3)					     curl_easy_setopt options					     CURLOPT_ISSUERCERT(3)

NAME

       CURLOPT_ISSUERCERT - issuer SSL certificate filename

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ISSUERCERT, char *file);

DESCRIPTION

       Pass  a	char * to a zero terminated string naming a file 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 CURLOPT_SSL_VERIFYPEER(3) 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 (CURLOPT_SSL_VERIFYPEER(3) 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.

DEFAULT

       NULL

PROTOCOLS

       All TLS-based protocols

EXAMPLE

       TODO

AVAILABILITY

       If built TLS enabled

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.

SEE ALSO

       CURLOPT_CRLFILE(3), CURLOPT_SSL_VERIFYPEER(3),

libcurl 7.54.0							 December 21, 2016					     CURLOPT_ISSUERCERT(3)