bionic (3) CURLOPT_ISSUERCERT.3.gz

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

       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);
       }

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),