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 #include "libcli/auth/libcli_auth.h"
  27 #include "auth/gensec/gensec.h"
  28 #include "auth/gensec/schannel_proto.h"
  29 #include "librpc/gen_ndr/ndr_netlogon.h"
  30 #include "librpc/gen_ndr/ndr_netlogon_c.h"
  31
  32
  33 /**
  34  * Decrypt and extract the user's passwords.
  35  *
  36  * The writes decrypted (no longer 'RID encrypted' or arcfour encrypted) passwords back into the structure
  37  */
  38 static NTSTATUS fix_user(TALLOC_CTX *mem_ctx,
  39                          struct creds_CredentialState *creds,
  40                          enum netr_SamDatabaseID database,
  41                          struct netr_DELTA_ENUM *delta,
  42                          char **error_string)
  43 {
  44
  45         uint32_t rid = delta->delta_id_union.rid;
  46         struct netr_DELTA_USER *user = delta->delta_union.user;
  47         struct samr_Password lm_hash;
  48         struct samr_Password nt_hash;
  49         const char *username = user->account_name.string;
  50         NTSTATUS nt_status;
  51
  52         if (user->lm_password_present) {
  53                 sam_rid_crypt(rid, user->lmpassword.hash, lm_hash.hash, 0);
  54                 user->lmpassword = lm_hash;
  55         }
  56
  57         if (user->nt_password_present) {
  58                 sam_rid_crypt(rid, user->ntpassword.hash, nt_hash.hash, 0);
  59                 user->ntpassword = nt_hash;
  60         }
  61
  62         if (user->user_private_info.SensitiveData) {
  63                 DATA_BLOB data;
  64                 struct netr_USER_KEYS keys;
  65                 data.data = user->user_private_info.SensitiveData;
  66                 data.length = user->user_private_info.DataLength;
  67                 creds_arcfour_crypt(creds, data.data, data.length);
  68                 user->user_private_info.SensitiveData = data.data;
  69                 user->user_private_info.DataLength = data.length;
  70
  71                 nt_status = ndr_pull_struct_blob(&data, mem_ctx, &keys, (ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS);
  72                 if (NT_STATUS_IS_OK(nt_status)) {
  73                         if (keys.keys.keys2.lmpassword.length == 16) {
  74                                 sam_rid_crypt(rid, keys.keys.keys2.lmpassword.pwd.hash, lm_hash.hash, 0);
  75                                 user->lmpassword = lm_hash;
  76                                 user->lm_password_present = True;
  77                         }
  78                         if (keys.keys.keys2.ntpassword.length == 16) {
  79                                 sam_rid_crypt(rid, keys.keys.keys2.ntpassword.pwd.hash, nt_hash.hash, 0);
  80                                 user->ntpassword = nt_hash;
  81                                 user->nt_password_present = True;
  82                         }
  83                 } else {
  84                         *error_string = talloc_asprintf(mem_ctx, "Failed to parse Sensitive Data for %s:", username);
  85                         dump_data(10, data.data, data.length);
  86                         return nt_status;
  87                 }
  88         }
  89         return NT_STATUS_OK;
  90 }
  91
  92 /**
  93  * Decrypt and extract the secrets
  94  *
  95  * The writes decrypted secrets back into the structure
  96  */
  97 static NTSTATUS fix_secret(TALLOC_CTX *mem_ctx,
  98                            struct creds_CredentialState *creds,
  99                            enum netr_SamDatabaseID database,
 100                            struct netr_DELTA_ENUM *delta,
 101                            char **error_string)
 102 {
 103         struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
 104         creds_arcfour_crypt(creds, secret->current_cipher.cipher_data,
 105                             secret->current_cipher.maxlen);
 106
 107         creds_arcfour_crypt(creds, secret->old_cipher.cipher_data,
 108                             secret->old_cipher.maxlen);
 109
 110         return NT_STATUS_OK;
 111 }
 112
 113 /**
 114  * Fix up the delta, dealing with encryption issues so that the final
 115  * callback need only do the printing or application logic
 116  */
 117
 118 static NTSTATUS fix_delta(TALLOC_CTX *mem_ctx,
 119                           struct creds_CredentialState *creds,
 120                           enum netr_SamDatabaseID database,
 121                           struct netr_DELTA_ENUM *delta,
 122                           char **error_string)
 123 {
 124         NTSTATUS nt_status = NT_STATUS_OK;
 125         *error_string = NULL;
 126         switch (delta->delta_type) {
 127         case NETR_DELTA_USER:
 128         {
 129                 nt_status = fix_user(mem_ctx,
 130                                      creds,
 131                                      database,
 132                                      delta,
 133                                      error_string);
 134                 break;
 135         }
 136         case NETR_DELTA_SECRET:
 137         {
 138                 nt_status = fix_secret(mem_ctx,
 139                                        creds,
 140                                        database,
 141                                        delta,
 142                                        error_string);
 143                 break;
 144         }
 145         default:
 146                 break;
 147         }
 148         return nt_status;
 149 }
 150
 151 NTSTATUS libnet_SamSync_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamSync *r)
 152 {
 153         NTSTATUS nt_status, dbsync_nt_status;
 154         TALLOC_CTX *samsync_ctx, *loop_ctx, *delta_ctx;
 155         struct creds_CredentialState *creds;
 156         struct netr_DatabaseSync dbsync;
 157         struct cli_credentials *machine_account;
 158         struct dcerpc_pipe *p;
 159         struct libnet_context *machine_net_ctx;
 160         struct libnet_RpcConnect *c;
 161         struct libnet_SamSync_state *state;
 162         const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS};
 163         int i;
 164
 165         samsync_ctx = talloc_named(mem_ctx, 0, "SamSync top context");
 166
 167         if (!r->in.machine_account) {
 168                 machine_account = cli_credentials_init(samsync_ctx);
 169                 if (!machine_account) {
 170                         talloc_free(samsync_ctx);
 171                         return NT_STATUS_NO_MEMORY;
 172                 }
 173                 cli_credentials_set_conf(machine_account);
 174                 nt_status = cli_credentials_set_machine_account(machine_account);
 175                 if (!NT_STATUS_IS_OK(nt_status)) {
 176                         r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain machine account password - are we joined to the domain?");
 177                         talloc_free(samsync_ctx);
 178                         return nt_status;
 179                 }
 180         } else {
 181                 machine_account = r->in.machine_account;
 182         }
 183
 184         /* We cannot do this unless we are a BDC.  Check, before we get odd errors later */
 185         if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) {
 186                 r->out.error_string
 187                         = talloc_asprintf(mem_ctx,
 188                                           "Our join to domain %s is not as a BDC (%d), please rejoin as a BDC",
 189                                           cli_credentials_get_domain(machine_account),
 190                                           cli_credentials_get_secure_channel_type(machine_account));
 191                 talloc_free(samsync_ctx);
 192                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 193         }
 194
 195         c = talloc(samsync_ctx, struct libnet_RpcConnect);
 196         if (!c) {
 197                 r->out.error_string = NULL;
 198                 talloc_free(samsync_ctx);
 199                 return NT_STATUS_NO_MEMORY;
 200         }
 201
 202         c->level              = LIBNET_RPC_CONNECT_DC_INFO;
 203         if (r->in.binding_string) {
 204                 c->in.binding = r->in.binding_string;
 205                 c->in.name    = NULL;
 206         } else {
 207                 c->in.binding = NULL;
 208                 c->in.name    = cli_credentials_get_domain(machine_account);
 209         }
 210
 211         /* prepare connect to the NETLOGON pipe of PDC */
 212         c->in.dcerpc_iface      = &dcerpc_table_netlogon;
 213
 214         /* We must do this as the machine, not as any command-line
 215          * user.  So we override the credentials in the
 216          * libnet_context */
 217         machine_net_ctx = talloc(samsync_ctx, struct libnet_context);
 218         if (!machine_net_ctx) {
 219                 r->out.error_string = NULL;
 220                 talloc_free(samsync_ctx);
 221                 return NT_STATUS_NO_MEMORY;
 222         }
 223         *machine_net_ctx = *ctx;
 224         machine_net_ctx->cred = machine_account;
 225
 226         /* connect to the NETLOGON pipe of the PDC */
 227         nt_status = libnet_RpcConnect(machine_net_ctx, samsync_ctx, c);
 228         if (!NT_STATUS_IS_OK(nt_status)) {
 229                 if (r->in.binding_string) {
 230                         r->out.error_string = talloc_asprintf(mem_ctx,
 231                                                               "Connection to NETLOGON pipe of DC %s failed: %s",
 232                                                               r->in.binding_string, c->out.error_string);
 233                 } else {
 234                         r->out.error_string = talloc_asprintf(mem_ctx,
 235                                                               "Connection to NETLOGON pipe of DC for %s failed: %s",
 236                                                               c->in.name, c->out.error_string);
 237                 }
 238                 talloc_free(samsync_ctx);
 239                 return nt_status;
 240         }
 241
 242         /* This makes a new pipe, on which we can do schannel.  We
 243          * should do this in the RpcConnect code, but the abstaction
 244          * layers do not suit yet */
 245
 246         nt_status = dcerpc_secondary_connection(c->out.dcerpc_pipe, &p,
 247                                                 c->out.dcerpc_pipe->binding);
 248
 249         if (!NT_STATUS_IS_OK(nt_status)) {
 250                 r->out.error_string = talloc_asprintf(mem_ctx,
 251                                                       "Secondary connection to NETLOGON pipe of DC %s failed: %s",
 252                                                       dcerpc_server_name(p), nt_errstr(nt_status));
 253                 talloc_free(samsync_ctx);
 254                 return nt_status;
 255         }
 256
 257         nt_status = dcerpc_bind_auth_schannel(samsync_ctx, p, &dcerpc_table_netlogon,
 258                                               machine_account, DCERPC_AUTH_LEVEL_PRIVACY);
 259
 260         if (!NT_STATUS_IS_OK(nt_status)) {
 261                 r->out.error_string = talloc_asprintf(mem_ctx,
 262                                                       "SCHANNEL authentication to NETLOGON pipe of DC %s failed: %s",
 263                                                       dcerpc_server_name(p), nt_errstr(nt_status));
 264                 talloc_free(samsync_ctx);
 265                 return nt_status;
 266         }
 267
 268         state = talloc(samsync_ctx, struct libnet_SamSync_state);
 269         if (!state) {
 270                 r->out.error_string = NULL;
 271                 talloc_free(samsync_ctx);
 272                 return nt_status;
 273         }
 274
 275         state->domain_name     = c->out.domain_name;
 276         state->domain_sid      = c->out.domain_sid;
 277         state->realm           = c->out.realm;
 278         state->domain_guid     = c->out.guid;
 279         state->machine_net_ctx = machine_net_ctx;
 280         state->netlogon_pipe   = p;
 281
 282         /* initialise the callback layer.  It may wish to contact the
 283          * server with ldap, now we know the name */
 284
 285         if (r->in.init_fn) {
 286                 char *error_string;
 287                 nt_status = r->in.init_fn(samsync_ctx,
 288                                           r->in.fn_ctx,
 289                                           state,
 290                                           &error_string);
 291                 if (!NT_STATUS_IS_OK(nt_status)) {
 292                         r->out.error_string = talloc_steal(mem_ctx, error_string);
 293                         talloc_free(samsync_ctx);
 294                         return nt_status;
 295                 }
 296         }
 297
 298         /* get NETLOGON credentails */
 299
 300         nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, samsync_ctx, &creds);
 301         if (!NT_STATUS_IS_OK(nt_status)) {
 302                 r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer");
 303                 talloc_free(samsync_ctx);
 304                 return nt_status;
 305         }
 306
 307         /* Setup details for the synchronisation */
 308         dbsync.in.logon_server = talloc_asprintf(samsync_ctx, "\\\\%s", dcerpc_server_name(p));
 309         dbsync.in.computername = cli_credentials_get_workstation(machine_account);
 310         dbsync.in.preferredmaximumlength = (uint32_t)-1;
 311         ZERO_STRUCT(dbsync.in.return_authenticator);
 312
 313         for (i=0;i< ARRAY_SIZE(database_ids); i++) {
 314                 dbsync.in.sync_context = 0;
 315                 dbsync.in.database_id = database_ids[i];
 316
 317                 do {
 318                         int d;
 319                         loop_ctx = talloc_named(samsync_ctx, 0, "DatabaseSync loop context");
 320                         creds_client_authenticator(creds, &dbsync.in.credential);
 321
 322                         dbsync_nt_status = dcerpc_netr_DatabaseSync(p, loop_ctx, &dbsync);
 323                         if (!NT_STATUS_IS_OK(dbsync_nt_status) &&
 324                             !NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) {
 325                                 r->out.error_string = talloc_asprintf(mem_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status));
 326                                 talloc_free(samsync_ctx);
 327                                 return nt_status;
 328                         }
 329
 330                         if (!creds_client_check(creds, &dbsync.out.return_authenticator.cred)) {
 331                                 r->out.error_string = talloc_strdup(mem_ctx, "Credential chaining on incoming DatabaseSync failed");
 332                                 talloc_free(samsync_ctx);
 333                                 return NT_STATUS_ACCESS_DENIED;
 334                         }
 335
 336                         dbsync.in.sync_context = dbsync.out.sync_context;
 337
 338                         /* For every single remote 'delta' entry: */
 339                         for (d=0; d < dbsync.out.delta_enum_array->num_deltas; d++) {
 340                                 char *error_string = NULL;
 341                                 delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context");
 342                                 /* 'Fix' elements, by decrypting and
 343                                  * de-obfuscating the data */
 344                                 nt_status = fix_delta(delta_ctx,
 345                                                       creds,
 346                                                       dbsync.in.database_id,
 347                                                       &dbsync.out.delta_enum_array->delta_enum[d],
 348                                                       &error_string);
 349                                 if (!NT_STATUS_IS_OK(nt_status)) {
 350                                         r->out.error_string = talloc_steal(mem_ctx, error_string);
 351                                         talloc_free(samsync_ctx);
 352                                         return nt_status;
 353                                 }
 354
 355                                 /* Now call the callback.  This will
 356                                  * do something like print the data or
 357                                  * write to an ldb */
 358                                 nt_status = r->in.delta_fn(delta_ctx,
 359                                                            r->in.fn_ctx,
 360                                                            dbsync.in.database_id,
 361                                                            &dbsync.out.delta_enum_array->delta_enum[d],
 362                                                            &error_string);
 363                                 if (!NT_STATUS_IS_OK(nt_status)) {
 364                                         r->out.error_string = talloc_steal(mem_ctx, error_string);
 365                                         talloc_free(samsync_ctx);
 366                                         return nt_status;
 367                                 }
 368                                 talloc_free(delta_ctx);
 369                         }
 370                         talloc_free(loop_ctx);
 371                 } while (NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES));
 372
 373                 if (!NT_STATUS_IS_OK(dbsync_nt_status)) {
 374                         r->out.error_string = talloc_asprintf(mem_ctx, "libnet_SamSync_netlogon failed: unexpected inconsistancy. Should not get error %s here", nt_errstr(nt_status));
 375                         talloc_free(samsync_ctx);
 376                         return dbsync_nt_status;
 377                 }
 378                 nt_status = NT_STATUS_OK;
 379         }
 380         talloc_free(samsync_ctx);
 381         return nt_status;
 382 }
 383