source4/libnet/libnet_vampire.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
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23
  24 #include "includes.h"
  25 #include "libnet/libnet.h"
  26
  27
  28 /**
  29  * Decrypt and extract the user's passwords.
  30  *
  31  * The writes decrypted (no longer 'RID encrypted' or arcfour encrypted) passwords back into the structure
  32  */
  33 static NTSTATUS fix_user(TALLOC_CTX *mem_ctx,
  34                          struct creds_CredentialState *creds,
  35                          enum netr_SamDatabaseID database,
  36                          struct netr_DELTA_ENUM *delta,
  37                          char **error_string)
  38 {
  39
  40         uint32_t rid = delta->delta_id_union.rid;
  41         struct netr_DELTA_USER *user = delta->delta_union.user;
  42         struct samr_Password lm_hash;
  43         struct samr_Password nt_hash;
  44         const char *username = user->account_name.string;
  45         NTSTATUS nt_status;
  46
  47         if (user->lm_password_present) {
  48                 sam_rid_crypt(rid, user->lmpassword.hash, lm_hash.hash, 0);
  49                 user->lmpassword = lm_hash;
  50         }
  51
  52         if (user->nt_password_present) {
  53                 sam_rid_crypt(rid, user->ntpassword.hash, nt_hash.hash, 0);
  54                 user->ntpassword = nt_hash;
  55         }
  56
  57         if (user->user_private_info.SensitiveData) {
  58                 DATA_BLOB data;
  59                 struct netr_USER_KEYS keys;
  60                 data.data = user->user_private_info.SensitiveData;
  61                 data.length = user->user_private_info.DataLength;
  62                 creds_arcfour_crypt(creds, data.data, data.length);
  63                 user->user_private_info.SensitiveData = data.data;
  64                 user->user_private_info.DataLength = data.length;
  65
  66                 nt_status = ndr_pull_struct_blob(&data, mem_ctx, &keys, (ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS);
  67                 if (NT_STATUS_IS_OK(nt_status)) {
  68                         if (keys.keys.keys2.lmpassword.length == 16) {
  69                                 sam_rid_crypt(rid, keys.keys.keys2.lmpassword.pwd.hash, lm_hash.hash, 0);
  70                                 user->lmpassword = lm_hash;
  71                                 user->lm_password_present = True;
  72                         }
  73                         if (keys.keys.keys2.ntpassword.length == 16) {
  74                                 sam_rid_crypt(rid, keys.keys.keys2.ntpassword.pwd.hash, nt_hash.hash, 0);
  75                                 user->ntpassword = nt_hash;
  76                                 user->nt_password_present = True;
  77                         }
  78                 } else {
  79                         *error_string = talloc_asprintf(mem_ctx, "Failed to parse Sensitive Data for %s:\n", username);
  80                         dump_data(10, data.data, data.length);
  81                         return nt_status;
  82                 }
  83         }
  84         return NT_STATUS_OK;
  85 }
  86
  87 /**
  88  * Decrypt and extract the secrets
  89  *
  90  * The writes decrypted secrets back into the structure
  91  */
  92 static NTSTATUS fix_secret(TALLOC_CTX *mem_ctx,
  93                            struct creds_CredentialState *creds,
  94                            enum netr_SamDatabaseID database,
  95                            struct netr_DELTA_ENUM *delta,
  96                            char **error_string)
  97 {
  98         struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
  99         creds_arcfour_crypt(creds, secret->current_cipher.cipher_data,
 100                             secret->current_cipher.maxlen);
 101
 102         creds_arcfour_crypt(creds, secret->old_cipher.cipher_data,
 103                             secret->old_cipher.maxlen);
 104
 105         return NT_STATUS_OK;
 106 }
 107
 108 /**
 109  * Fix up the delta, dealing with encryption issues so that the final
 110  * callback need only do the printing or application logic
 111  */
 112
 113 static NTSTATUS fix_delta(TALLOC_CTX *mem_ctx,
 114                           struct creds_CredentialState *creds,
 115                           enum netr_SamDatabaseID database,
 116                           struct netr_DELTA_ENUM *delta,
 117                           char **error_string)
 118 {
 119         NTSTATUS nt_status = NT_STATUS_OK;
 120         *error_string = NULL;
 121         switch (delta->delta_type) {
 122         case NETR_DELTA_USER:
 123         {
 124                 nt_status = fix_user(mem_ctx,
 125                                      creds,
 126                                      database,
 127                                      delta,
 128                                      error_string);
 129                 break;
 130         }
 131         case NETR_DELTA_SECRET:
 132         {
 133                 nt_status = fix_secret(mem_ctx,
 134                                        creds,
 135                                        database,
 136                                        delta,
 137                                        error_string);
 138                 break;
 139         }
 140         default:
 141                 break;
 142         }
 143         return nt_status;
 144 }
 145
 146 NTSTATUS libnet_SamSync_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamSync *r)
 147 {
 148         NTSTATUS nt_status, dbsync_nt_status;
 149         TALLOC_CTX *samsync_ctx, *loop_ctx, *delta_ctx;
 150         struct creds_CredentialState *creds;
 151         struct netr_DatabaseSync dbsync;
 152         struct cli_credentials *machine_account;
 153         struct dcerpc_pipe *p;
 154         struct libnet_context *machine_net_ctx;
 155         struct libnet_RpcConnectDCInfo *c;
 156         const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS};
 157         int i;
 158
 159         samsync_ctx = talloc_named(mem_ctx, 0, "SamSync top context");
 160
 161         if (!r->in.machine_account) {
 162                 machine_account = cli_credentials_init(samsync_ctx);
 163                 if (!machine_account) {
 164                         talloc_free(samsync_ctx);
 165                         return NT_STATUS_NO_MEMORY;
 166                 }
 167                 cli_credentials_set_conf(machine_account);
 168                 nt_status = cli_credentials_set_machine_account(machine_account);
 169                 if (!NT_STATUS_IS_OK(nt_status)) {
 170                         r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain machine account password - are we joined to the domain?");
 171                         talloc_free(samsync_ctx);
 172                         return nt_status;
 173                 }
 174         } else {
 175                 machine_account = r->in.machine_account;
 176         }
 177
 178         /* We cannot do this unless we are a BDC.  Check, before we get odd errors later */
 179         if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) {
 180                 r->out.error_string
 181                         = talloc_asprintf(mem_ctx,
 182                                           "Our join to domain %s is not as a BDC (%d), please rejoin as a BDC",
 183
 184                                           cli_credentials_get_domain(machine_account),
 185                                           cli_credentials_get_secure_channel_type(machine_account));
 186                 talloc_free(samsync_ctx);
 187                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 188         }
 189
 190         c = talloc(samsync_ctx, struct libnet_RpcConnectDCInfo);
 191         if (!c) {
 192                 r->out.error_string = NULL;
 193                 talloc_free(samsync_ctx);
 194                 return NT_STATUS_NO_MEMORY;
 195         }
 196
 197         if (r->in.binding_string) {
 198                 c->level      = LIBNET_RPC_CONNECT_BINDING;
 199                 c->in.binding = r->in.binding_string;
 200         } else {
 201                 /* prepare connect to the NETLOGON pipe of PDC */
 202                 c->level      = LIBNET_RPC_CONNECT_PDC;
 203                 c->in.name    = cli_credentials_get_domain(machine_account);
 204         }
 205         c->in.dcerpc_iface      = &dcerpc_table_netlogon;
 206
 207         /* We must do this as the machine, not as any command-line
 208          * user.  So we override the credentials in the
 209          * libnet_context */
 210         machine_net_ctx = talloc(samsync_ctx, struct libnet_context);
 211         if (!machine_net_ctx) {
 212                 r->out.error_string = NULL;
 213                 talloc_free(samsync_ctx);
 214                 return NT_STATUS_NO_MEMORY;
 215         }
 216         *machine_net_ctx = *ctx;
 217         machine_net_ctx->cred = machine_account;
 218
 219         /* connect to the NETLOGON pipe of the PDC */
 220         nt_status = libnet_RpcConnectDCInfo(machine_net_ctx, c);
 221         if (!NT_STATUS_IS_OK(nt_status)) {
 222                 if (r->in.binding_string) {
 223                         r->out.error_string = talloc_asprintf(mem_ctx,
 224                                                               "Connection to NETLOGON pipe of DC %s failed: %s",
 225                                                               r->in.binding_string, c->out.error_string);
 226                 } else {
 227                         r->out.error_string = talloc_asprintf(mem_ctx,
 228                                                               "Connection to NETLOGON pipe of DC for %s failed: %s",
 229                                                               c->in.name, c->out.error_string);
 230                 }
 231                 talloc_free(samsync_ctx);
 232                 return nt_status;
 233         }
 234
 235         /* This makes a new pipe, on which we can do schannel.  We
 236          * should do this in the RpcConnect code, but the abstaction
 237          * layers do not suit yet */
 238
 239         nt_status = dcerpc_secondary_connection(c->out.dcerpc_pipe, &p,
 240                                                 c->out.dcerpc_pipe->binding);
 241
 242         if (!NT_STATUS_IS_OK(nt_status)) {
 243                 r->out.error_string = talloc_asprintf(mem_ctx,
 244                                                       "Secondary connection to NETLOGON pipe of DC %s failed: %s",
 245                                                       dcerpc_server_name(p), nt_errstr(nt_status));
 246                 talloc_free(samsync_ctx);
 247                 return nt_status;
 248         }
 249
 250         nt_status = dcerpc_bind_auth_schannel(samsync_ctx, p, &dcerpc_table_netlogon,
 251                                               machine_account, DCERPC_AUTH_LEVEL_PRIVACY);
 252
 253         if (!NT_STATUS_IS_OK(nt_status)) {
 254                 r->out.error_string = talloc_asprintf(mem_ctx,
 255                                                       "SCHANNEL authentication to NETLOGON pipe of DC %s failed: %s",
 256                                                       dcerpc_server_name(p), nt_errstr(nt_status));
 257                 talloc_free(samsync_ctx);
 258                 return nt_status;
 259         }
 260
 261         /* initialise the callback layer.  It may wish to contact the
 262          * server with ldap, now we know the name */
 263
 264         if (r->in.init_fn) {
 265                 char *error_string;
 266                 nt_status = r->in.init_fn(samsync_ctx,
 267                                           r->in.fn_ctx,
 268                                           machine_net_ctx,
 269                                           p,
 270                                           c->out.domain_name,
 271                                           c->out.domain_sid,
 272                                           c->out.realm,
 273                                           &error_string);
 274                 if (!NT_STATUS_IS_OK(nt_status)) {
 275                         r->out.error_string = talloc_steal(mem_ctx, error_string);
 276                         talloc_free(samsync_ctx);
 277                         return nt_status;
 278                 }
 279         }
 280
 281         /* get NETLOGON credentails */
 282
 283         nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, samsync_ctx, &creds);
 284         if (!NT_STATUS_IS_OK(nt_status)) {
 285                 r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer");
 286                 talloc_free(samsync_ctx);
 287                 return nt_status;
 288         }
 289
 290         /* Setup details for the syncronisation */
 291         dbsync.in.logon_server = talloc_asprintf(samsync_ctx, "\\\\%s", dcerpc_server_name(p));
 292         dbsync.in.computername = cli_credentials_get_workstation(machine_account);
 293         dbsync.in.preferredmaximumlength = (uint32_t)-1;
 294         ZERO_STRUCT(dbsync.in.return_authenticator);
 295
 296         for (i=0;i< ARRAY_SIZE(database_ids); i++) {
 297                 dbsync.in.sync_context = 0;
 298                 dbsync.in.database_id = database_ids[i];
 299
 300                 do {
 301                         int d;
 302                         loop_ctx = talloc_named(samsync_ctx, 0, "DatabaseSync loop context");
 303                         creds_client_authenticator(creds, &dbsync.in.credential);
 304
 305                         dbsync_nt_status = dcerpc_netr_DatabaseSync(p, loop_ctx, &dbsync);
 306                         if (!NT_STATUS_IS_OK(dbsync_nt_status) &&
 307                             !NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) {
 308                                 r->out.error_string = talloc_asprintf(mem_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status));
 309                                 talloc_free(samsync_ctx);
 310                                 return nt_status;
 311                         }
 312
 313                         if (!creds_client_check(creds, &dbsync.out.return_authenticator.cred)) {
 314                                 r->out.error_string = talloc_strdup(mem_ctx, "Credential chaining on incoming DatabaseSync failed");
 315                                 talloc_free(samsync_ctx);
 316                                 return NT_STATUS_ACCESS_DENIED;
 317                         }
 318
 319                         dbsync.in.sync_context = dbsync.out.sync_context;
 320
 321                         /* For every single remote 'delta' entry: */
 322                         for (d=0; d < dbsync.out.delta_enum_array->num_deltas; d++) {
 323                                 char *error_string = NULL;
 324                                 delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context");
 325                                 /* 'Fix' elements, by decrypting and
 326                                  * de-obfustiating the data */
 327                                 nt_status = fix_delta(delta_ctx,
 328                                                       creds,
 329                                                       dbsync.in.database_id,
 330                                                       &dbsync.out.delta_enum_array->delta_enum[d],
 331                                                       &error_string);
 332                                 if (!NT_STATUS_IS_OK(nt_status)) {
 333                                         r->out.error_string = talloc_steal(mem_ctx, error_string);
 334                                         talloc_free(samsync_ctx);
 335                                         return nt_status;
 336                                 }
 337
 338                                 /* Now call the callback.  This will
 339                                  * do something like print the data or
 340                                  * write to an ldb */
 341                                 nt_status = r->in.delta_fn(delta_ctx,
 342                                                            r->in.fn_ctx,
 343                                                            dbsync.in.database_id,
 344                                                            &dbsync.out.delta_enum_array->delta_enum[d],
 345                                                            &error_string);
 346                                 if (!NT_STATUS_IS_OK(nt_status)) {
 347                                         r->out.error_string = talloc_steal(mem_ctx, error_string);
 348                                         talloc_free(samsync_ctx);
 349                                         return nt_status;
 350                                 }
 351                                 talloc_free(delta_ctx);
 352                         }
 353                         talloc_free(loop_ctx);
 354                 } while (NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES));
 355
 356                 if (!NT_STATUS_IS_OK(dbsync_nt_status)) {
 357                         r->out.error_string = talloc_asprintf(mem_ctx, "libnet_SamSync_netlogon failed: unexpected inconsistancy. Should not get error %s here", nt_errstr(nt_status));
 358                         talloc_free(samsync_ctx);
 359                         return dbsync_nt_status;
 360                 }
 361                 nt_status = NT_STATUS_OK;
 362         }
 363         talloc_free(samsync_ctx);
 364         return nt_status;
 365 }
 366