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CURLOPT_CAINFO(3)	   curl_easy_setopt options	     CURLOPT_CAINFO(3)


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 zero 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 cacert
       bundle is assumed to be stored, as established at build time.

       If  curl is built against the NSS SSL library, the NSS PEM PKCS#11 mod-
       ule (libnsspem.so) needs to be available for this option to work  prop-
       erly.   Starting  with  curl-7.55.0, if both CURLOPT_CAINFO(3) and CUR-
       LOPT_CAPATH(3) are unset, NSS-linked  libcurl  tries  to  load  libnss-
       ckbi.so,  which	contains a more comprehensive set of trust information
       than supported by nss-pem, because libnssckbi.so also includes informa-
       tion about distrusted certificates.

       (iOS  and  macOS  only) If curl is built against Secure Transport, then
       this option is supported for  backward  compatibility  with  other  SSL
       engines,  but it should not be set. If the option is not set, then curl
       will use the certificates in the system and user Keychain to verify the
       peer, which is the preferred method of verifying the peer's certificate
       chain.

       (Schannel/WinSSL only) This option is supported for WinSSL in Windows 7
       or later with libcurl 7.60 or later. This option is supported for back-
       ward compatibility with other SSL engines; instead it is recommended to
       use Windows' store of root certificates (the default for WinSSL).

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


DEFAULT

       Built-in system specific


PROTOCOLS

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


EXAMPLE

       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");
	 ret = curl_easy_perform(curl);
	 curl_easy_cleanup(curl);
       }


AVAILABILITY

       For SSL engines that don't support certificate files the CURLOPT_CAINFO
       option is ignored. Refer to https://curl.haxx.se/docs/ssl-compared.html


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_CAPATH(3),    CURLOPT_SSL_VERIFYPEER(3),    CURLOPT_SSL_VERIFY-
       HOST(3),

libcurl 7.63.0			March 10, 2017		     CURLOPT_CAINFO(3)

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