CURLOPT_SSL_VERIFYPEER(3)  curl_easy_setopt options  CURLOPT_SSL_VERIFYPEER(3)

NAME
       CURLOPT_SSL_VERIFYPEER - verify the peer's SSL certificate

SYNOPSIS
       #include <curl/curl.h>

       CURLcode  curl_easy_setopt(CURL  *handle,  CURLOPT_SSL_VERIFYPEER, long
       verify);

DESCRIPTION
       Pass a long as parameter to enable or disable.

       This option determines whether curl verifies the  authenticity  of  the
       peer's certificate. A value of 1 means curl verifies; 0 (zero) means it
       doesn't.

       When negotiating a TLS or SSL connection, the server sends  a  certifi-
       cate indicating its identity.  Curl verifies whether the certificate is
       authentic, i.e. that you can trust that the server is who the  certifi-
       cate says it is.  This trust is based on a chain of digital signatures,
       rooted in certification authority (CA) certificates you  supply.   curl
       uses  a  default bundle of CA certificates (the path for that is deter-
       mined at build time) and you can specify  alternate  certificates  with
       the CURLOPT_CAINFO(3) option or the CURLOPT_CAPATH(3) option.

       When  CURLOPT_SSL_VERIFYPEER(3)  is enabled, and the verification fails
       to prove that the certificate is authentic, the connection fails.  When
       the  option is zero, the peer certificate verification succeeds regard-
       less.

       Authenticating the certificate is not  enough  to  be  sure  about  the
       server. You typically also want to ensure that the server is the server
       you mean to be talking to.  Use CURLOPT_SSL_VERIFYHOST(3) for that. The
       check  that the host name in the certificate is valid for the host name
       you're connecting to is done  independently  of  the  CURLOPT_SSL_VERI-
       FYPEER(3) option.

       WARNING:  disabling  verification of the certificate allows bad guys to
       man-in-the-middle the communication without you knowing  it.  Disabling
       verification  makes  the communication insecure. Just having encryption
       on a transfer is not enough as you cannot be sure that you are communi-
       cating with the correct end-point.

DEFAULT
       By default, curl assumes a value of 1.

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");

         /* Set the default value: strict certificate check please */
         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);

         curl_easy_perform(curl);
       }

AVAILABILITY
       If built TLS enabled.

RETURN VALUE
       Returns  CURLE_OK  if the option is supported, and CURLE_UNKNOWN_OPTION
       if not.

SEE ALSO
       CURLOPT_SSL_VERIFYHOST(3),    CURLOPT_PROXY_SSL_VERIFYPEER(3),     CUR-
       LOPT_PROXY_SSL_VERIFYHOST(3),

libcurl 7.54.0                 February 09, 2017     CURLOPT_SSL_VERIFYPEER(3)