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)