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
  22 extern struct auth_context *negprot_global_auth_context;
  23 extern bool global_encrypted_passwords_negotiated;
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_AUTH
  27
  28 /****************************************************************************
  29  COMPATIBILITY INTERFACES:
  30  ***************************************************************************/
  31
  32 /****************************************************************************
  33 check if a username/password is OK assuming the password is in plaintext
  34 return True if the password is correct, False otherwise
  35 ****************************************************************************/
  36
  37 NTSTATUS check_plaintext_password(const char *smb_name,
  38                                   DATA_BLOB plaintext_blob,
  39                                   struct auth_serversupplied_info **server_info)
  40 {
  41         struct auth_context *plaintext_auth_context = NULL;
  42         struct auth_usersupplied_info *user_info = NULL;
  43         uint8_t chal[8];
  44         NTSTATUS nt_status;
  45
  46         nt_status = make_auth_context_subsystem(talloc_tos(),
  47                                                 &plaintext_auth_context);
  48         if (!NT_STATUS_IS_OK(nt_status)) {
  49                 return nt_status;
  50         }
  51
  52         plaintext_auth_context->get_ntlm_challenge(plaintext_auth_context,
  53                                                    chal);
  54
  55         if (!make_user_info_for_reply(&user_info,
  56                                       smb_name, lp_workgroup(), chal,
  57                                       plaintext_blob)) {
  58                 return NT_STATUS_NO_MEMORY;
  59         }
  60
  61         nt_status = plaintext_auth_context->check_ntlm_password(plaintext_auth_context,
  62                                                                 user_info, server_info);
  63
  64         TALLOC_FREE(plaintext_auth_context);
  65         free_user_info(&user_info);
  66         return nt_status;
  67 }
  68
  69 static NTSTATUS pass_check_smb(struct auth_context *actx,
  70                                const char *smb_name,
  71                                const char *domain,
  72                                DATA_BLOB lm_pwd,
  73                                DATA_BLOB nt_pwd)
  74
  75 {
  76         NTSTATUS nt_status;
  77         struct auth_serversupplied_info *server_info = NULL;
  78         struct auth_usersupplied_info *user_info = NULL;
  79         if (actx == NULL) {
  80                 return NT_STATUS_INTERNAL_ERROR;
  81         }
  82         make_user_info_for_reply_enc(&user_info, smb_name,
  83                                      domain,
  84                                      lm_pwd,
  85                                      nt_pwd);
  86         nt_status = actx->check_ntlm_password(actx, user_info, &server_info);
  87         free_user_info(&user_info);
  88         TALLOC_FREE(server_info);
  89         return nt_status;
  90 }
  91
  92 /****************************************************************************
  93 check if a username/password pair is ok via the auth subsystem.
  94 return True if the password is correct, False otherwise
  95 ****************************************************************************/
  96
  97 bool password_ok(struct auth_context *actx, bool global_encrypted,
  98                  const char *session_workgroup,
  99                  const char *smb_name, DATA_BLOB password_blob)
 100 {
 101
 102         DATA_BLOB null_password = data_blob_null;
 103         bool encrypted = (global_encrypted && (password_blob.length == 24 || password_blob.length > 46));
 104
 105         if (encrypted) {
 106                 /*
 107                  * The password could be either NTLM or plain LM.  Try NTLM first,
 108                  * but fall-through as required.
 109                  * Vista sends NTLMv2 here - we need to try the client given workgroup.
 110                  */
 111                 if (session_workgroup) {
 112                         if (NT_STATUS_IS_OK(pass_check_smb(actx, smb_name, session_workgroup, null_password, password_blob))) {
 113                                 return True;
 114                         }
 115                         if (NT_STATUS_IS_OK(pass_check_smb(actx, smb_name, session_workgroup, password_blob, null_password))) {
 116                                 return True;
 117                         }
 118                 }
 119
 120                 if (NT_STATUS_IS_OK(pass_check_smb(actx, smb_name, lp_workgroup(), null_password, password_blob))) {
 121                         return True;
 122                 }
 123
 124                 if (NT_STATUS_IS_OK(pass_check_smb(actx, smb_name, lp_workgroup(), password_blob, null_password))) {
 125                         return True;
 126                 }
 127         } else {
 128                 struct auth_serversupplied_info *server_info = NULL;
 129                 NTSTATUS nt_status = check_plaintext_password(smb_name, password_blob, &server_info);
 130                 TALLOC_FREE(server_info);
 131                 if (NT_STATUS_IS_OK(nt_status)) {
 132                         return True;
 133                 }
 134         }
 135
 136         return False;
 137 }