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  pointer  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

       This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

       All TLS backends support this option.

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);
         }
       }

HISTORY

       Schannel support added in libcurl 7.60.

AVAILABILITY

       Added in curl 7.4.2

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_CAINFO_BLOB(3),               CURLOPT_CAPATH(3),
       CURLOPT_CA_CACHE_TIMEOUT(3), CURLOPT_SSL_VERIFYHOST(3), CURLOPT_SSL_VERIFYPEER(3)