noble (3) CURLOPT_PROXY_ISSUERCERT.3.gz

NAME

       CURLOPT_PROXY_ISSUERCERT - proxy issuer SSL certificate filename

SYNOPSIS

       #include <curl/curl.h>

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

DESCRIPTION

       Pass  a  char  * to a null-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 of  the
       the  HTTPS  proxy  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_PROXY_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_PROXY_SSL_VERIFYPEER(3) has to be set too for the check to fail).

       The application does not have to keep the string around after setting this option.

DEFAULT

       NULL

PROTOCOLS

       All TLS-based protocols

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
           /* using an HTTPS proxy */
           curl_easy_setopt(curl, CURLOPT_PROXY, "https://localhost:443");
           curl_easy_setopt(curl, CURLOPT_PROXY_ISSUERCERT, "/etc/certs/cacert.pem");
           res = curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY

       Added in 7.71.0. This option is supported by the OpenSSL backends.

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_ISSUERCERT(3),          CURLOPT_PROXY_SSL_VERIFYHOST(3),         CURLOPT_PROXY_SSL_VERIFYPEER(3),
       CURLOPT_SSL_VERIFYHOST(3), CURLOPT_SSL_VERIFYPEER(3)