NAME

       CURLOPT_CAINFO - path to Certificate Authority (CA) bundle

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CAINFO, char *path);

DESCRIPTION

       Pass  a  char  * to a null-terminated string naming a file holding one or more certificates to verify the
       peer with.

       If CURLOPT_SSL_VERIFYPEER(3) is zero and you avoid verifying the server's certificate,  CURLOPT_CAINFO(3)
       need not even indicate an accessible file.

       This  option  is by default set to the system path where libcurl's CA certificate bundle is assumed to be
       stored, as established at build time.

       (iOS and macOS) When curl uses Secure Transport this option is supported. If the option is not set,  then
       curl uses the certificates in the system and user Keychain to verify the peer.

       (Schannel)  This  option  is  supported  for Schannel in Windows 7 or later but we recommend not using it
       until Windows 8 since it works better starting then.  If the option  is  not  set,  then  curl  uses  the
       certificates in the Windows' store of root certificates (the default for Schannel).

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

       The default value for this can be figured out with CURLINFO_CAINFO(3).

DEFAULT

       Built-in system specific. When curl is built with Secure Transport or Schannel, this option is not set by
       default.

PROTOCOLS

       All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
           curl_easy_setopt(curl, CURLOPT_CAINFO, "/etc/certs/cabundle.pem");
           curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY

       For the SSL engines that do not support  certificate  files  the  CURLOPT_CAINFO(3)  option  is  ignored.
       Schannel support added in libcurl 7.60.

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

       CURLINFO_CAINFO(3),     CURLOPT_CA_CACHE_TIMEOUT(3),      CURLOPT_CAINFO_BLOB(3),      CURLOPT_CAPATH(3),
       CURLOPT_SSL_VERIFYHOST(3), CURLOPT_SSL_VERIFYPEER(3)