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CURLOPT_CAINFO(3)

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CURLOPT_CAINFO(3)          Library Functions Manual          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 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 ac‐
       cessible 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.

       (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  certifi‐
       cates  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.

       Using this option multiple times makes the last set string override the
       previous ones. Set it to NULL to disable its use again.

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

DEFAULT
       Built-in system specific. When curl is built with 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
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       box; cbp-1 | cbp-1 l | l .  ATTRIBUTE TYPE ATTRIBUTE VALUE = Availabil‐
       ity   web/curl = Stability Uncommitted

SEE ALSO
       CURLINFO_CAINFO(3),   CURLOPT_CAINFO_BLOB(3),  CURLOPT_CAPATH(3),  CUR‐
       LOPT_CA_CACHE_TIMEOUT(3), CURLOPT_SSL_VERIFYHOST(3),  CURLOPT_SSL_VERI‐
       FYPEER(3)



NOTES
       Source  code  for open source software components in Oracle Solaris can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-
       code-downloads.html.

       This software was built from source available at:
       https://github.com/oracle/solaris-userland

       The original community source was downloaded from:
       https://curl.se/download/curl-8.17.0.tar.bz2

       Further information about this software can be found on the open source
       community website at http://curl.haxx.se/.

libcurl                           2025-12-01                 CURLOPT_CAINFO(3)
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