source3/auth/auth_compat.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Bartlett         2001-2002
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "auth.h"
  22 #include "../lib/tsocket/tsocket.h"
  23
  24 extern struct auth_context *negprot_global_auth_context;
  25 extern bool global_encrypted_passwords_negotiated;
  26
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_AUTH
  29
  30 /****************************************************************************
  31  COMPATIBILITY INTERFACES:
  32  ***************************************************************************/
  33
  34 /****************************************************************************
  35 check if a username/password is OK assuming the password is in plaintext
  36 return True if the password is correct, False otherwise
  37 ****************************************************************************/
  38
  39 NTSTATUS check_plaintext_password(const char *smb_name,
  40                                   const struct tsocket_address *remote_address,
  41                                   DATA_BLOB plaintext_blob,
  42                                   struct auth_serversupplied_info **server_info)
  43 {
  44         struct auth_context *plaintext_auth_context = NULL;
  45         struct auth_usersupplied_info *user_info = NULL;
  46         uint8_t chal[8];
  47         NTSTATUS nt_status;
  48
  49         nt_status = make_auth_context_subsystem(talloc_tos(),
  50                                                 &plaintext_auth_context);
  51         if (!NT_STATUS_IS_OK(nt_status)) {
  52                 return nt_status;
  53         }
  54
  55         plaintext_auth_context->get_ntlm_challenge(plaintext_auth_context,
  56                                                    chal);
  57
  58         if (!make_user_info_for_reply(&user_info,
  59                                       smb_name, lp_workgroup(),
  60                                       remote_address,
  61                                       chal,
  62                                       plaintext_blob)) {
  63                 return NT_STATUS_NO_MEMORY;
  64         }
  65
  66         nt_status = plaintext_auth_context->check_ntlm_password(plaintext_auth_context,
  67                                                                 user_info, server_info);
  68
  69         TALLOC_FREE(plaintext_auth_context);
  70         free_user_info(&user_info);
  71         return nt_status;
  72 }
  73
  74 static NTSTATUS pass_check_smb(struct auth_context *actx,
  75                                const char *smb_name,
  76                                const char *domain,
  77                                const struct tsocket_address *remote_address,
  78                                DATA_BLOB lm_pwd,
  79                                DATA_BLOB nt_pwd)
  80
  81 {
  82         NTSTATUS nt_status;
  83         struct auth_serversupplied_info *server_info = NULL;
  84         struct auth_usersupplied_info *user_info = NULL;
  85         if (actx == NULL) {
  86                 return NT_STATUS_INTERNAL_ERROR;
  87         }
  88         make_user_info_for_reply_enc(&user_info, smb_name,
  89                                      domain,
  90                                      remote_address,
  91                                      lm_pwd,
  92                                      nt_pwd);
  93         nt_status = actx->check_ntlm_password(actx, user_info, &server_info);
  94         free_user_info(&user_info);
  95         TALLOC_FREE(server_info);
  96         return nt_status;
  97 }
  98
  99 /****************************************************************************
 100 check if a username/password pair is ok via the auth subsystem.
 101 return True if the password is correct, False otherwise
 102 ****************************************************************************/
 103
 104 bool password_ok(struct auth_context *actx, bool global_encrypted,
 105                  const char *session_workgroup,
 106                  const char *smb_name,
 107                  const struct tsocket_address *remote_address,
 108                  DATA_BLOB password_blob)
 109 {
 110
 111         DATA_BLOB null_password = data_blob_null;
 112         bool encrypted = (global_encrypted && (password_blob.length == 24 || password_blob.length > 46));
 113
 114         if (encrypted) {
 115                 /*
 116                  * The password could be either NTLM or plain LM.  Try NTLM first,
 117                  * but fall-through as required.
 118                  * Vista sends NTLMv2 here - we need to try the client given workgroup.
 119                  */
 120                 if (session_workgroup) {
 121                         if (NT_STATUS_IS_OK(pass_check_smb(actx,
 122                                                            smb_name,
 123                                                            session_workgroup,
 124                                                            remote_address,
 125                                                            null_password,
 126                                                            password_blob))) {
 127                                 return True;
 128                         }
 129                         if (NT_STATUS_IS_OK(pass_check_smb(actx,
 130                                                            smb_name,
 131                                                            session_workgroup,
 132                                                            remote_address,
 133                                                            password_blob,
 134                                                            null_password))) {
 135                                 return True;
 136                         }
 137                 }
 138
 139                 if (NT_STATUS_IS_OK(pass_check_smb(actx,
 140                                                    smb_name,
 141                                                    lp_workgroup(),
 142                                                    remote_address,
 143                                                    null_password,
 144                                                    password_blob))) {
 145                         return True;
 146                 }
 147
 148                 if (NT_STATUS_IS_OK(pass_check_smb(actx,
 149                                                    smb_name,
 150                                                    lp_workgroup(),
 151                                                    remote_address,
 152                                                    password_blob,
 153                                                    null_password))) {
 154                         return True;
 155                 }
 156         } else {
 157                 struct auth_serversupplied_info *server_info = NULL;
 158                 NTSTATUS nt_status = check_plaintext_password(smb_name,
 159                                                               remote_address,
 160                                                               password_blob,
 161                                                               &server_info);
 162                 TALLOC_FREE(server_info);
 163                 if (NT_STATUS_IS_OK(nt_status)) {
 164                         return True;
 165                 }
 166         }
 167
 168         return False;
 169 }