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         size_t ulen = strlen(username);
  42         const char *nb_name = lp_netbios_name();
  43         size_t nb_namelen = strlen(nb_name);
  44
  45         if (ulen == 0 || username[ulen-1] != '$') {
  46                 return false;
  47         }
  48         if (nb_namelen != ulen-1) {
  49                 return false;
  50         }
  51         ret = strnequal(username, nb_name, ulen-1);
  52         return ret;
  53 }
  54
  55 /***************************************************************************
  56  Make (and fill) a user_info struct from a struct samu
  57 ***************************************************************************/
  58
  59 NTSTATUS make_server_info_sam(TALLOC_CTX *mem_ctx,
  60                               struct samu *sampass,
  61                               struct auth_serversupplied_info **pserver_info)
  62 {
  63         struct passwd *pwd;
  64         struct auth_serversupplied_info *server_info;
  65         const char *username = pdb_get_username(sampass);
  66         TALLOC_CTX *tmp_ctx = talloc_stackframe();
  67         NTSTATUS status;
  68
  69         server_info = make_server_info(tmp_ctx);
  70         if (server_info == NULL) {
  71                 status = NT_STATUS_NO_MEMORY;
  72                 goto out;
  73         }
  74
  75         pwd = Get_Pwnam_alloc(tmp_ctx, username);
  76         if (pwd == NULL) {
  77                 DEBUG(1, ("User %s in passdb, but getpwnam() fails!\n",
  78                           pdb_get_username(sampass)));
  79                 status = NT_STATUS_NO_SUCH_USER;
  80                 goto out;
  81         }
  82
  83         status = samu_to_SamInfo3(server_info,
  84                                   sampass,
  85                                   lp_netbios_name(),
  86                                   &server_info->info3,
  87                                   &server_info->extra);
  88         if (!NT_STATUS_IS_OK(status)) {
  89                 goto out;
  90         }
  91
  92         server_info->unix_name = talloc_move(server_info, &pwd->pw_name);
  93
  94         server_info->utok.gid = pwd->pw_gid;
  95         server_info->utok.uid = pwd->pw_uid;
  96
  97         if (IS_DC && is_our_machine_account(username)) {
  98                 /*
  99                  * This is a hack of monstrous proportions.
 100                  * If we know it's winbindd talking to us,
 101                  * we know we must never recurse into it,
 102                  * so turn off contacting winbindd for this
 103                  * entire process. This will get fixed when
 104                  * winbindd doesn't need to talk to smbd on
 105                  * a PDC. JRA.
 106                  */
 107
 108                 (void)winbind_off();
 109
 110                 DEBUG(10, ("make_server_info_sam: our machine account %s "
 111                            "turning off winbindd requests.\n", username));
 112         }
 113
 114         DEBUG(5,("make_server_info_sam: made server info for user %s -> %s\n",
 115                  pdb_get_username(sampass), server_info->unix_name));
 116
 117         *pserver_info = talloc_move(mem_ctx, &server_info);
 118
 119         status = NT_STATUS_OK;
 120 out:
 121         talloc_free(tmp_ctx);
 122
 123         return status;
 124 }