NAME

       CURLOPT_HTTPAUTH - set HTTP server authentication methods to try

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTPAUTH, long bitmask);

DESCRIPTION

       Pass  a long as parameter, which is set to a bitmask, to tell libcurl which authentication
       method(s) you want it to use speaking to the remote server.

       The available bits are listed below. If more than one bit is set, libcurl will first query
       the  site  to  see which authentication methods it supports and then pick the best one you
       allow it to use. For some methods, this will induce an extra network round-trip.  Set  the
       actual   name   and   password   with   the   CURLOPT_USERPWD(3)   option   or   with  the
       CURLOPT_USERNAME(3) and the CURLOPT_PASSWORD(3) options.

       For authentication with a proxy, see CURLOPT_PROXYAUTH(3).

       CURLAUTH_BASIC
              HTTP Basic authentication. This is the default choice, and the only method that  is
              in wide-spread use and supported virtually everywhere. This sends the user name and
              password over the network in plain text, easily captured by others.

       CURLAUTH_DIGEST
              HTTP Digest authentication.  Digest authentication is defined in RFC2617 and  is  a
              more  secure  way  to  do authentication over public networks than the regular old-
              fashioned Basic method.

       CURLAUTH_DIGEST_IE
              HTTP Digest authentication with an IE flavor.  Digest authentication is defined  in
              RFC2617 and is a more secure way to do authentication over public networks than the
              regular old-fashioned Basic method. The IE flavor is simply that libcurl will use a
              special  "quirk"  that  IE  is  known  to  have used before version 7 and that some
              servers require the client to use.

       CURLAUTH_NEGOTIATE
              HTTP Negotiate (SPNEGO) authentication. Negotiate authentication is defined in  RFC
              4559 and is the most secure way to perform authentication over HTTP.

              You  need  to  build libcurl with a suitable GSS-API library or SSPI on Windows for
              this to work.

       CURLAUTH_NTLM
              HTTP NTLM authentication. A proprietary protocol invented and used by Microsoft. It
              uses  a  challenge-response  and  hash  concept  similar  to Digest, to prevent the
              password from being eavesdropped.

              You need to build libcurl with either OpenSSL,  GnuTLS  or  NSS  support  for  this
              option to work, or build libcurl on Windows with SSPI support.

       CURLAUTH_NTLM_WB
              NTLM delegating to winbind helper. Authentication is performed by a separate binary
              application that is executed when needed. The name of the application is  specified
              at compile time but is typically /usr/bin/ntlm_auth

              Note  that libcurl will fork when necessary to run the winbind application and kill
              it when complete, calling waitpid() to await its exit when done. On POSIX operating
              systems,  killing  the process will cause a SIGCHLD signal to be raised (regardless
              of whether CURLOPT_NOSIGNAL(3) is set), which must be handled intelligently by  the
              application. In particular, the application must not unconditionally call wait() in
              its SIGCHLD signal handler to avoid  being  subject  to  a  race  condition.   This
              behavior is subject to change in future versions of libcurl.

       CURLAUTH_ANY
              This  is  a convenience macro that sets all bits and thus makes libcurl pick any it
              finds suitable. libcurl will automatically select the one it finds most secure.

       CURLAUTH_ANYSAFE
              This is a convenience macro that sets all bits except Basic and thus makes  libcurl
              pick any it finds suitable. libcurl will automatically select the one it finds most
              secure.

       CURLAUTH_ONLY
              This is a meta symbol. OR this value together with a single specific auth value  to
              force  libcurl  to  probe  for un-restricted auth and if not, only that single auth
              algorithm is acceptable.

DEFAULT

       CURLAUTH_BASIC

PROTOCOLS

       HTTP

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         CURLcode ret;
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
         /* allow whatever auth the server speaks */
         curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
         curl_easy_setopt(curl, CURLOPT_USERPWD, "james:bond");
         ret = curl_easy_perform(curl);
       }

AVAILABILITY

       Option Added in 7.10.6.

       CURLAUTH_DIGEST_IE was added added in 7.19.3

       CURLAUTH_ONLY was added in 7.21.3

       CURLAUTH_NTLM_WB was added in 7.22.0

RETURN VALUE

       Returns  CURLE_OK  if  the  option  is  supported,   CURLE_UNKNOWN_OPTION   if   not,   or
       CURLE_NOT_BUILT_IN if the bitmask specified no supported authentication methods.

SEE ALSO

       CURLOPT_PROXYAUTH(3), CURLOPT_USERPWD(3),