libcli/samsync/decrypt.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 #include "../lib/crypto/crypto.h"
  26 #include "../libcli/auth/libcli_auth.h"
  27 #include "../libcli/samsync/samsync.h"
  28 #include "librpc/gen_ndr/ndr_netlogon.h"
  29
  30 /**
  31  * Decrypt and extract the user's passwords.
  32  *
  33  * The writes decrypted (no longer 'RID encrypted' or arcfour encrypted)
  34  * passwords back into the structure
  35  */
  36
  37 static NTSTATUS fix_user(TALLOC_CTX *mem_ctx,
  38                          struct netlogon_creds_CredentialState *creds,
  39                          enum netr_SamDatabaseID database_id,
  40                          struct netr_DELTA_ENUM *delta)
  41 {
  42
  43         uint32_t rid = delta->delta_id_union.rid;
  44         struct netr_DELTA_USER *user = delta->delta_union.user;
  45         struct samr_Password lm_hash;
  46         struct samr_Password nt_hash;
  47
  48         /* Note that win2000 may send us all zeros
  49          * for the hashes if it doesn't
  50          * think this channel is secure enough. */
  51         if (user->lm_password_present) {
  52                 if (!all_zero(user->lmpassword.hash, 16)) {
  53                         sam_rid_crypt(rid, user->lmpassword.hash, lm_hash.hash, 0);
  54                 } else {
  55                         memset(lm_hash.hash, '\0', sizeof(lm_hash.hash));
  56                 }
  57                 user->lmpassword = lm_hash;
  58         }
  59
  60         if (user->nt_password_present) {
  61                 if (!all_zero(user->ntpassword.hash, 16)) {
  62                         sam_rid_crypt(rid, user->ntpassword.hash, nt_hash.hash, 0);
  63                 } else {
  64                         memset(nt_hash.hash, '\0', sizeof(nt_hash.hash));
  65                 }
  66                 user->ntpassword = nt_hash;
  67         }
  68
  69         if (user->user_private_info.SensitiveData) {
  70                 DATA_BLOB data;
  71                 struct netr_USER_KEYS keys;
  72                 enum ndr_err_code ndr_err;
  73                 data.data = user->user_private_info.SensitiveData;
  74                 data.length = user->user_private_info.DataLength;
  75                 netlogon_creds_arcfour_crypt(creds, data.data, data.length);
  76                 user->user_private_info.SensitiveData = data.data;
  77                 user->user_private_info.DataLength = data.length;
  78
  79                 ndr_err = ndr_pull_struct_blob(&data, mem_ctx, &keys,
  80                         (ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS);
  81                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  82                         dump_data(10, data.data, data.length);
  83                         return ndr_map_error2ntstatus(ndr_err);
  84                 }
  85
  86                 /* Note that win2000 may send us all zeros
  87                  * for the hashes if it doesn't
  88                  * think this channel is secure enough. */
  89                 if (keys.keys.keys2.lmpassword.length == 16) {
  90                         if (!all_zero(keys.keys.keys2.lmpassword.pwd.hash,
  91                                       16)) {
  92                                 sam_rid_crypt(rid,
  93                                               keys.keys.keys2.lmpassword.pwd.hash,
  94                                               lm_hash.hash, 0);
  95                         } else {
  96                                 memset(lm_hash.hash, '\0', sizeof(lm_hash.hash));
  97                         }
  98                         user->lmpassword = lm_hash;
  99                         user->lm_password_present = true;
 100                 }
 101                 if (keys.keys.keys2.ntpassword.length == 16) {
 102                         if (!all_zero(keys.keys.keys2.ntpassword.pwd.hash,
 103                                       16)) {
 104                                 sam_rid_crypt(rid,
 105                                               keys.keys.keys2.ntpassword.pwd.hash,
 106                                               nt_hash.hash, 0);
 107                         } else {
 108                                 memset(nt_hash.hash, '\0', sizeof(nt_hash.hash));
 109                         }
 110                         user->ntpassword = nt_hash;
 111                         user->nt_password_present = true;
 112                 }
 113                 /* TODO: rid decrypt history fields */
 114         }
 115         return NT_STATUS_OK;
 116 }
 117
 118 /**
 119  * Decrypt and extract the secrets
 120  *
 121  * The writes decrypted secrets back into the structure
 122  */
 123 static NTSTATUS fix_secret(TALLOC_CTX *mem_ctx,
 124                            struct netlogon_creds_CredentialState *creds,
 125                            enum netr_SamDatabaseID database,
 126                            struct netr_DELTA_ENUM *delta)
 127 {
 128         struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
 129         netlogon_creds_arcfour_crypt(creds, secret->current_cipher.cipher_data,
 130                             secret->current_cipher.maxlen);
 131
 132         netlogon_creds_arcfour_crypt(creds, secret->old_cipher.cipher_data,
 133                             secret->old_cipher.maxlen);
 134
 135         return NT_STATUS_OK;
 136 }
 137
 138 /**
 139  * Fix up the delta, dealing with encryption issues so that the final
 140  * callback need only do the printing or application logic
 141  */
 142
 143 NTSTATUS samsync_fix_delta(TALLOC_CTX *mem_ctx,
 144                            struct netlogon_creds_CredentialState *creds,
 145                            enum netr_SamDatabaseID database_id,
 146                            struct netr_DELTA_ENUM *delta)
 147 {
 148         NTSTATUS status = NT_STATUS_OK;
 149
 150         switch (delta->delta_type) {
 151                 case NETR_DELTA_USER:
 152
 153                         status = fix_user(mem_ctx,
 154                                           creds,
 155                                           database_id,
 156                                           delta);
 157                         break;
 158                 case NETR_DELTA_SECRET:
 159
 160                         status = fix_secret(mem_ctx,
 161                                             creds,
 162                                             database_id,
 163                                             delta);
 164                         break;
 165                 default:
 166                         break;
 167         }
 168
 169         return status;
 170 }
 171