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      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 2014 - 2016, Steve Holme, <steve_holme (at) hotmail.com>.
      9  *
     10  * This software is licensed as described in the file COPYING, which
     11  * you should have received as part of this distribution. The terms
     12  * are also available at https://curl.haxx.se/docs/copyright.html.
     13  *
     14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
     15  * copies of the Software, and permit persons to whom the Software is
     16  * furnished to do so, under the terms of the COPYING file.
     17  *
     18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
     19  * KIND, either express or implied.
     20  *
     21  ***************************************************************************/
     22 
     23 #include "curl_setup.h"
     24 
     25 #include <curl/curl.h>
     26 
     27 #include "vauth.h"
     28 #include "curl_multibyte.h"
     29 #include "curl_printf.h"
     30 
     31 /* The last #include files should be: */
     32 #include "curl_memory.h"
     33 #include "memdebug.h"
     34 
     35 /*
     36  * Curl_auth_build_spn()
     37  *
     38  * This is used to build a SPN string in the following formats:
     39  *
     40  * service/host@realm (Not currently used)
     41  * service/host       (Not used by GSS-API)
     42  * service@realm      (Not used by Windows SSPI)
     43  *
     44  * Parameters:
     45  *
     46  * service  [in] - The service type such as http, smtp, pop or imap.
     47  * host     [in] - The host name.
     48  * realm    [in] - The realm.
     49  *
     50  * Returns a pointer to the newly allocated SPN.
     51  */
     52 #if !defined(USE_WINDOWS_SSPI)
     53 char *Curl_auth_build_spn(const char *service, const char *host,
     54                           const char *realm)
     55 {
     56   char *spn = NULL;
     57 
     58   /* Generate our SPN */
     59   if(host && realm)
     60     spn = aprintf("%s/%s@%s", service, host, realm);
     61   else if(host)
     62     spn = aprintf("%s/%s", service, host);
     63   else if(realm)
     64     spn = aprintf("%s@%s", service, realm);
     65 
     66   /* Return our newly allocated SPN */
     67   return spn;
     68 }
     69 #else
     70 TCHAR *Curl_auth_build_spn(const char *service, const char *host,
     71                            const char *realm)
     72 {
     73   char *utf8_spn = NULL;
     74   TCHAR *tchar_spn = NULL;
     75 
     76   (void) realm;
     77 
     78   /* Note: We could use DsMakeSPN() or DsClientMakeSpnForTargetServer() rather
     79      than doing this ourselves but the first is only available in Windows XP
     80      and Windows Server 2003 and the latter is only available in Windows 2000
     81      but not Windows95/98/ME or Windows NT4.0 unless the Active Directory
     82      Client Extensions are installed. As such it is far simpler for us to
     83      formulate the SPN instead. */
     84 
     85   /* Generate our UTF8 based SPN */
     86   utf8_spn = aprintf("%s/%s", service, host);
     87   if(!utf8_spn) {
     88     return NULL;
     89   }
     90 
     91   /* Allocate our TCHAR based SPN */
     92   tchar_spn = Curl_convert_UTF8_to_tchar(utf8_spn);
     93   if(!tchar_spn) {
     94     free(utf8_spn);
     95 
     96     return NULL;
     97   }
     98 
     99   /* Release the UTF8 variant when operating with Unicode */
    100   Curl_unicodefree(utf8_spn);
    101 
    102   /* Return our newly allocated SPN */
    103   return tchar_spn;
    104 }
    105 #endif /* USE_WINDOWS_SSPI */
    106 
    107