source/libnet/libnet_samsync.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Extract the user/system database from a remote SamSync server
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   7    Copyright (C) Guenther Deschner <gd@samba.org> 2008
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23
  24 #include "includes.h"
  25
  26 /**
  27  * Decrypt and extract the user's passwords.
  28  *
  29  * The writes decrypted (no longer 'RID encrypted' or arcfour encrypted)
  30  * passwords back into the structure
  31  */
  32
  33 static NTSTATUS fix_user(TALLOC_CTX *mem_ctx,
  34                          DATA_BLOB *session_key,
  35                          enum netr_SamDatabaseID database_id,
  36                          struct netr_DELTA_ENUM *delta)
  37 {
  38
  39         uint32_t rid = delta->delta_id_union.rid;
  40         struct netr_DELTA_USER *user = delta->delta_union.user;
  41         struct samr_Password lm_hash;
  42         struct samr_Password nt_hash;
  43         unsigned char zero_buf[16];
  44
  45         memset(zero_buf, '\0', sizeof(zero_buf));
  46
  47         /* Note that win2000 may send us all zeros
  48          * for the hashes if it doesn't
  49          * think this channel is secure enough. */
  50         if (user->lm_password_present) {
  51                 if (memcmp(user->lmpassword.hash, zero_buf, 16) != 0) {
  52                         sam_pwd_hash(rid, user->lmpassword.hash, lm_hash.hash, 0);
  53                 } else {
  54                         memset(lm_hash.hash, '\0', sizeof(lm_hash.hash));
  55                 }
  56                 user->lmpassword = lm_hash;
  57         }
  58
  59         if (user->nt_password_present) {
  60                 if (memcmp(user->ntpassword.hash, zero_buf, 16) != 0) {
  61                         sam_pwd_hash(rid, user->ntpassword.hash, nt_hash.hash, 0);
  62                 } else {
  63                         memset(nt_hash.hash, '\0', sizeof(nt_hash.hash));
  64                 }
  65                 user->ntpassword = nt_hash;
  66         }
  67
  68         if (user->user_private_info.SensitiveData) {
  69                 DATA_BLOB data;
  70                 struct netr_USER_KEYS keys;
  71                 enum ndr_err_code ndr_err;
  72                 data.data = user->user_private_info.SensitiveData;
  73                 data.length = user->user_private_info.DataLength;
  74                 SamOEMhashBlob(data.data, data.length, session_key);
  75                 user->user_private_info.SensitiveData = data.data;
  76                 user->user_private_info.DataLength = data.length;
  77
  78                 ndr_err = ndr_pull_struct_blob(&data, mem_ctx, &keys,
  79                         (ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS);
  80                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  81                         dump_data(10, data.data, data.length);
  82                         return ndr_map_error2ntstatus(ndr_err);
  83                 }
  84
  85                 /* Note that win2000 may send us all zeros
  86                  * for the hashes if it doesn't
  87                  * think this channel is secure enough. */
  88                 if (keys.keys.keys2.lmpassword.length == 16) {
  89                         if (memcmp(keys.keys.keys2.lmpassword.pwd.hash,
  90                                                 zero_buf, 16) != 0) {
  91                                 sam_pwd_hash(rid,
  92                                              keys.keys.keys2.lmpassword.pwd.hash,
  93                                              lm_hash.hash, 0);
  94                         } else {
  95                                 memset(lm_hash.hash, '\0', sizeof(lm_hash.hash));
  96                         }
  97                         user->lmpassword = lm_hash;
  98                         user->lm_password_present = true;
  99                 }
 100                 if (keys.keys.keys2.ntpassword.length == 16) {
 101                         if (memcmp(keys.keys.keys2.ntpassword.pwd.hash,
 102                                                 zero_buf, 16) != 0) {
 103                                 sam_pwd_hash(rid,
 104                                         keys.keys.keys2.ntpassword.pwd.hash,
 105                                         nt_hash.hash, 0);
 106                         } else {
 107                                 memset(nt_hash.hash, '\0', sizeof(nt_hash.hash));
 108                         }
 109                         user->ntpassword = nt_hash;
 110                         user->nt_password_present = true;
 111                 }
 112                 /* TODO: rid decrypt history fields */
 113         }
 114         return NT_STATUS_OK;
 115 }
 116
 117 /**
 118  * Decrypt and extract the secrets
 119  *
 120  * The writes decrypted secrets back into the structure
 121  */
 122 static NTSTATUS fix_secret(TALLOC_CTX *mem_ctx,
 123                            DATA_BLOB *session_key,
 124                            enum netr_SamDatabaseID database_id,
 125                            struct netr_DELTA_ENUM *delta)
 126 {
 127         struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
 128
 129         SamOEMhashBlob(secret->current_cipher.cipher_data,
 130                        secret->current_cipher.maxlen,
 131                        session_key);
 132
 133         SamOEMhashBlob(secret->old_cipher.cipher_data,
 134                        secret->old_cipher.maxlen,
 135                        session_key);
 136
 137         return NT_STATUS_OK;
 138 }
 139
 140 /**
 141  * Fix up the delta, dealing with encryption issues so that the final
 142  * callback need only do the printing or application logic
 143  */
 144
 145 static NTSTATUS samsync_fix_delta(TALLOC_CTX *mem_ctx,
 146                                   DATA_BLOB *session_key,
 147                                   enum netr_SamDatabaseID database_id,
 148                                   struct netr_DELTA_ENUM *delta)
 149 {
 150         NTSTATUS status = NT_STATUS_OK;
 151
 152         switch (delta->delta_type) {
 153                 case NETR_DELTA_USER:
 154
 155                         status = fix_user(mem_ctx,
 156                                           session_key,
 157                                           database_id,
 158                                           delta);
 159                         break;
 160                 case NETR_DELTA_SECRET:
 161
 162                         status = fix_secret(mem_ctx,
 163                                             session_key,
 164                                             database_id,
 165                                             delta);
 166                         break;
 167                 default:
 168                         break;
 169         }
 170
 171         return status;
 172 }
 173
 174 /**
 175  * Fix up the delta, dealing with encryption issues so that the final
 176  * callback need only do the printing or application logic
 177  */
 178
 179 NTSTATUS samsync_fix_delta_array(TALLOC_CTX *mem_ctx,
 180                                  DATA_BLOB *session_key,
 181                                  enum netr_SamDatabaseID database_id,
 182                                  struct netr_DELTA_ENUM_ARRAY *r)
 183 {
 184         NTSTATUS status;
 185         int i;
 186
 187         for (i = 0; i < r->num_deltas; i++) {
 188
 189                 status = samsync_fix_delta(mem_ctx,
 190                                            session_key,
 191                                            database_id,
 192                                            &r->delta_enum[i]);
 193                 if (!NT_STATUS_IS_OK(status)) {
 194                         return status;
 195                 }
 196         }
 197
 198         return NT_STATUS_OK;
 199 }