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| .TH CURLOPT_CAINFO 3 "May 27, 2017" "libcurl 7.57.0" "curl_easy_setopt options" |
| |
| .SH NAME |
| CURLOPT_CAINFO \- path to Certificate Authority (CA) bundle |
| .SH SYNOPSIS |
| #include <curl/curl.h> |
| |
| CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CAINFO, char *path); |
| .SH DESCRIPTION |
| Pass a char * to a zero terminated string naming a file holding one or more |
| certificates to verify the peer with. |
| |
| If \fICURLOPT_SSL_VERIFYPEER(3)\fP is zero and you avoid verifying the |
| server's certificate, \fICURLOPT_CAINFO(3)\fP 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 module |
| (libnsspem.so) needs to be available for this option to work properly. |
| Starting with curl-7.55.0, if both \fICURLOPT_CAINFO(3)\fP and |
| \fICURLOPT_CAPATH(3)\fP are unset, NSS-linked libcurl tries to load |
| libnssckbi.so, which contains a more comprehensive set of trust information |
| than supported by nss-pem, because libnssckbi.so also includes information |
| 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. |
| |
| The application does not have to keep the string around after setting this |
| option. |
| .SH DEFAULT |
| Built-in system specific |
| .SH PROTOCOLS |
| All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc. |
| .SH EXAMPLE |
| .nf |
| 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); |
| } |
| .fi |
| .SH 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 |
| .SH 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. |
| .SH "SEE ALSO" |
| .BR CURLOPT_CAPATH "(3), " |
| .BR CURLOPT_SSL_VERIFYPEER "(3), " CURLOPT_SSL_VERIFYHOST "(3), " |
