source4/auth/ntlm/auth_util.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) Stefan Metzmacher 2005
   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/auth.h"
  26 #include "libcli/auth/libcli_auth.h"
  27 #include "param/param.h"
  28 #include "auth/ntlm/auth_proto.h"
  29 #include "librpc/gen_ndr/drsuapi.h"
  30 #include "dsdb/samdb/samdb.h"
  31
  32 /* this default function can be used by mostly all backends
  33  * which don't want to set a challenge
  34  */
  35 NTSTATUS auth_get_challenge_not_implemented(struct auth_method_context *ctx, TALLOC_CTX *mem_ctx, uint8_t chal[8])
  36 {
  37         /* we don't want to set a challenge */
  38         return NT_STATUS_NOT_IMPLEMENTED;
  39 }
  40
  41 /****************************************************************************
  42  Create an auth_usersupplied_data structure after appropriate mapping.
  43 ****************************************************************************/
  44
  45 NTSTATUS encrypt_user_info(TALLOC_CTX *mem_ctx, struct auth4_context *auth_context,
  46                            enum auth_password_state to_state,
  47                            const struct auth_usersupplied_info *user_info_in,
  48                            const struct auth_usersupplied_info **user_info_encrypted)
  49 {
  50         NTSTATUS nt_status;
  51         struct auth_usersupplied_info *user_info_temp;
  52         switch (to_state) {
  53         case AUTH_PASSWORD_RESPONSE:
  54                 switch (user_info_in->password_state) {
  55                 case AUTH_PASSWORD_PLAIN:
  56                 {
  57                         const struct auth_usersupplied_info *user_info_temp2;
  58                         nt_status = encrypt_user_info(mem_ctx, auth_context,
  59                                                       AUTH_PASSWORD_HASH,
  60                                                       user_info_in, &user_info_temp2);
  61                         if (!NT_STATUS_IS_OK(nt_status)) {
  62                                 return nt_status;
  63                         }
  64                         user_info_in = user_info_temp2;
  65
  66                         FALL_THROUGH;
  67                 }
  68                 case AUTH_PASSWORD_HASH:
  69                 {
  70                         uint8_t chal[8];
  71                         DATA_BLOB chall_blob;
  72                         user_info_temp = talloc_zero(mem_ctx, struct auth_usersupplied_info);
  73                         if (!user_info_temp) {
  74                                 return NT_STATUS_NO_MEMORY;
  75                         }
  76                         if (!talloc_reference(user_info_temp, user_info_in)) {
  77                                 return NT_STATUS_NO_MEMORY;
  78                         }
  79                         *user_info_temp = *user_info_in;
  80                         user_info_temp->mapped_state = to_state;
  81
  82                         nt_status = auth_get_challenge(auth_context, chal);
  83                         if (!NT_STATUS_IS_OK(nt_status)) {
  84                                 return nt_status;
  85                         }
  86
  87                         chall_blob = data_blob_talloc(mem_ctx, chal, 8);
  88                         if (lpcfg_client_ntlmv2_auth(auth_context->lp_ctx)) {
  89                                 DATA_BLOB names_blob = NTLMv2_generate_names_blob(mem_ctx,  lpcfg_netbios_name(auth_context->lp_ctx), lpcfg_workgroup(auth_context->lp_ctx));
  90                                 DATA_BLOB lmv2_response, ntlmv2_response, lmv2_session_key, ntlmv2_session_key;
  91
  92                                 if (!SMBNTLMv2encrypt_hash(user_info_temp,
  93                                                            user_info_in->client.account_name,
  94                                                            user_info_in->client.domain_name,
  95                                                            user_info_in->password.hash.nt->hash,
  96                                                            &chall_blob,
  97                                                            NULL, /* server_timestamp */
  98                                                            &names_blob,
  99                                                            &lmv2_response, &ntlmv2_response,
 100                                                            &lmv2_session_key, &ntlmv2_session_key)) {
 101                                         data_blob_free(&names_blob);
 102                                         return NT_STATUS_NO_MEMORY;
 103                                 }
 104                                 data_blob_free(&names_blob);
 105                                 user_info_temp->password.response.lanman = lmv2_response;
 106                                 user_info_temp->password.response.nt = ntlmv2_response;
 107
 108                                 data_blob_free(&lmv2_session_key);
 109                                 data_blob_free(&ntlmv2_session_key);
 110                         } else {
 111                                 DATA_BLOB blob = data_blob_talloc(mem_ctx, NULL, 24);
 112                                 SMBOWFencrypt(user_info_in->password.hash.nt->hash, chal, blob.data);
 113
 114                                 user_info_temp->password.response.nt = blob;
 115                                 if (lpcfg_client_lanman_auth(auth_context->lp_ctx) && user_info_in->password.hash.lanman) {
 116                                         DATA_BLOB lm_blob = data_blob_talloc(mem_ctx, NULL, 24);
 117                                         SMBOWFencrypt(user_info_in->password.hash.lanman->hash, chal, blob.data);
 118                                         user_info_temp->password.response.lanman = lm_blob;
 119                                 } else {
 120                                         /* if not sending the LM password, send the NT password twice */
 121                                         user_info_temp->password.response.lanman = user_info_temp->password.response.nt;
 122                                 }
 123                         }
 124
 125                         user_info_in = user_info_temp;
 126
 127                         FALL_THROUGH;
 128                 }
 129                 case AUTH_PASSWORD_RESPONSE:
 130                         *user_info_encrypted = user_info_in;
 131                 }
 132                 break;
 133         case AUTH_PASSWORD_HASH:
 134         {
 135                 switch (user_info_in->password_state) {
 136                 case AUTH_PASSWORD_PLAIN:
 137                 {
 138                         struct samr_Password lanman;
 139                         struct samr_Password nt;
 140
 141                         user_info_temp = talloc_zero(mem_ctx, struct auth_usersupplied_info);
 142                         if (!user_info_temp) {
 143                                 return NT_STATUS_NO_MEMORY;
 144                         }
 145                         if (!talloc_reference(user_info_temp, user_info_in)) {
 146                                 return NT_STATUS_NO_MEMORY;
 147                         }
 148                         *user_info_temp = *user_info_in;
 149                         user_info_temp->mapped_state = to_state;
 150
 151                         if (E_deshash(user_info_in->password.plaintext, lanman.hash)) {
 152                                 user_info_temp->password.hash.lanman = talloc(user_info_temp,
 153                                                                               struct samr_Password);
 154                                 *user_info_temp->password.hash.lanman = lanman;
 155                         } else {
 156                                 user_info_temp->password.hash.lanman = NULL;
 157                         }
 158
 159                         E_md4hash(user_info_in->password.plaintext, nt.hash);
 160                         user_info_temp->password.hash.nt = talloc(user_info_temp,
 161                                                                    struct samr_Password);
 162                         *user_info_temp->password.hash.nt = nt;
 163
 164                         user_info_in = user_info_temp;
 165
 166                         FALL_THROUGH;
 167                 }
 168                 case AUTH_PASSWORD_HASH:
 169                         *user_info_encrypted = user_info_in;
 170                         break;
 171                 default:
 172                         return NT_STATUS_INVALID_PARAMETER;
 173                         break;
 174                 }
 175                 break;
 176         }
 177         default:
 178                 return NT_STATUS_INVALID_PARAMETER;
 179         }
 180
 181         return NT_STATUS_OK;
 182 }