source3/auth/server_info_sam.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Authentication utility functions
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Andrew Bartlett 2001
   6    Copyright (C) Jeremy Allison 2000-2001
   7    Copyright (C) Rafal Szczesniak 2002
   8    Copyright (C) Volker Lendecke 2006
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "auth.h"
  26 #include "nsswitch/winbind_client.h"
  27 #include "passdb.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_AUTH
  31
  32
  33 /***************************************************************************
  34  Is the incoming username our own machine account ?
  35  If so, the connection is almost certainly from winbindd.
  36 ***************************************************************************/
  37
  38 static bool is_our_machine_account(const char *username)
  39 {
  40         bool ret;
  41         char *truncname = NULL;
  42         size_t ulen = strlen(username);
  43
  44         if (ulen == 0 || username[ulen-1] != '$') {
  45                 return false;
  46         }
  47         truncname = SMB_STRDUP(username);
  48         if (!truncname) {
  49                 return false;
  50         }
  51         truncname[ulen-1] = '\0';
  52         ret = strequal(truncname, global_myname());
  53         SAFE_FREE(truncname);
  54         return ret;
  55 }
  56
  57 /***************************************************************************
  58  Make (and fill) a user_info struct from a struct samu
  59 ***************************************************************************/
  60
  61 NTSTATUS make_server_info_sam(struct auth_serversupplied_info **server_info,
  62                               struct samu *sampass)
  63 {
  64         struct passwd *pwd;
  65         struct auth_serversupplied_info *result;
  66         const char *username = pdb_get_username(sampass);
  67         NTSTATUS status;
  68
  69         if ( !(result = make_server_info(NULL)) ) {
  70                 return NT_STATUS_NO_MEMORY;
  71         }
  72
  73         if ( !(pwd = Get_Pwnam_alloc(result, username)) ) {
  74                 DEBUG(1, ("User %s in passdb, but getpwnam() fails!\n",
  75                           pdb_get_username(sampass)));
  76                 TALLOC_FREE(result);
  77                 return NT_STATUS_NO_SUCH_USER;
  78         }
  79
  80         status = samu_to_SamInfo3(result, sampass, global_myname(),
  81                                   &result->info3, &result->extra);
  82         if (!NT_STATUS_IS_OK(status)) {
  83                 TALLOC_FREE(result);
  84                 return status;
  85         }
  86
  87         result->unix_name = pwd->pw_name;
  88         /* Ensure that we keep pwd->pw_name, because we will free pwd below */
  89         talloc_steal(result, pwd->pw_name);
  90         result->utok.gid = pwd->pw_gid;
  91         result->utok.uid = pwd->pw_uid;
  92
  93         TALLOC_FREE(pwd);
  94
  95         result->sanitized_username = sanitize_username(result,
  96                                                        result->unix_name);
  97         if (result->sanitized_username == NULL) {
  98                 TALLOC_FREE(result);
  99                 return NT_STATUS_NO_MEMORY;
 100         }
 101
 102         if (IS_DC && is_our_machine_account(username)) {
 103                 /*
 104                  * This is a hack of monstrous proportions.
 105                  * If we know it's winbindd talking to us,
 106                  * we know we must never recurse into it,
 107                  * so turn off contacting winbindd for this
 108                  * entire process. This will get fixed when
 109                  * winbindd doesn't need to talk to smbd on
 110                  * a PDC. JRA.
 111                  */
 112
 113                 (void)winbind_off();
 114
 115                 DEBUG(10, ("make_server_info_sam: our machine account %s "
 116                            "turning off winbindd requests.\n", username));
 117         }
 118
 119         DEBUG(5,("make_server_info_sam: made server info for user %s -> %s\n",
 120                  pdb_get_username(sampass), result->unix_name));
 121
 122         *server_info = result;
 123
 124         return NT_STATUS_OK;
 125 }