source3/utils/net_rpc_join.c

   1 /*
   2    Samba Unix/Linux SMB client library
   3    Distributed SMB/CIFS Server Management Utility
   4    Copyright (C) 2001 Andrew Bartlett (abartlet@samba.org)
   5    Copyright (C) Tim Potter     2001
   6    Copyright (C) 2008 Guenther Deschner
   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 3 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, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "includes.h"
  22 #include "utils/net.h"
  23 #include "rpc_client/cli_pipe.h"
  24 #include "../libcli/auth/libcli_auth.h"
  25 #include "../librpc/gen_ndr/ndr_lsa_c.h"
  26 #include "rpc_client/cli_lsarpc.h"
  27 #include "../librpc/gen_ndr/ndr_samr_c.h"
  28 #include "rpc_client/init_samr.h"
  29 #include "../librpc/gen_ndr/ndr_netlogon.h"
  30 #include "rpc_client/cli_netlogon.h"
  31 #include "secrets.h"
  32 #include "rpc_client/init_lsa.h"
  33 #include "libsmb/libsmb.h"
  34 #include "../libcli/smb/smbXcli_base.h"
  35
  36 /* Macro for checking RPC error codes to make things more readable */
  37
  38 #define CHECK_RPC_ERR(rpc, msg) \
  39         if (!NT_STATUS_IS_OK(status = rpc)) { \
  40                 DEBUG(0, (msg ": %s\n", nt_errstr(status))); \
  41                 goto done; \
  42         }
  43
  44 #define CHECK_DCERPC_ERR(rpc, msg) \
  45         if (!NT_STATUS_IS_OK(status = rpc)) { \
  46                 DEBUG(0, (msg ": %s\n", nt_errstr(status))); \
  47                 goto done; \
  48         } \
  49         if (!NT_STATUS_IS_OK(result)) { \
  50                 status = result; \
  51                 DEBUG(0, (msg ": %s\n", nt_errstr(result))); \
  52                 goto done; \
  53         }
  54
  55
  56 #define CHECK_RPC_ERR_DEBUG(rpc, debug_args) \
  57         if (!NT_STATUS_IS_OK(status = rpc)) { \
  58                 DEBUG(0, debug_args); \
  59                 goto done; \
  60         }
  61
  62 #define CHECK_DCERPC_ERR_DEBUG(rpc, debug_args) \
  63         if (!NT_STATUS_IS_OK(status = rpc)) { \
  64                 DEBUG(0, debug_args); \
  65                 goto done; \
  66         } \
  67         if (!NT_STATUS_IS_OK(result)) { \
  68                 status = result; \
  69                 DEBUG(0, debug_args); \
  70                 goto done; \
  71         }
  72
  73
  74 /**
  75  * confirm that a domain join is still valid
  76  *
  77  * @return A shell status integer (0 for success)
  78  *
  79  **/
  80 NTSTATUS net_rpc_join_ok(struct net_context *c, const char *domain,
  81                          const char *server,
  82                          const struct sockaddr_storage *server_ss)
  83 {
  84         enum security_types sec;
  85         unsigned int conn_flags = NET_FLAGS_PDC;
  86         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
  87         struct cli_state *cli = NULL;
  88         struct rpc_pipe_client *pipe_hnd = NULL;
  89         struct rpc_pipe_client *netlogon_pipe = NULL;
  90         NTSTATUS ntret = NT_STATUS_UNSUCCESSFUL;
  91
  92         sec = (enum security_types)lp_security();
  93
  94         if (sec == SEC_ADS) {
  95                 /* Connect to IPC$ using machine account's credentials. We don't use anonymous
  96                    connection here, as it may be denied by server's local policy. */
  97                 net_use_machine_account(c);
  98
  99         } else {
 100                 /* some servers (e.g. WinNT) don't accept machine-authenticated
 101                    smb connections */
 102                 conn_flags |= NET_FLAGS_ANONYMOUS;
 103         }
 104
 105         /* Connect to remote machine */
 106         ntret = net_make_ipc_connection_ex(c, domain, server, server_ss,
 107                                            conn_flags, &cli);
 108         if (!NT_STATUS_IS_OK(ntret)) {
 109                 return ntret;
 110         }
 111
 112         /* Setup the creds as though we're going to do schannel... */
 113         ntret = get_schannel_session_key(cli, domain, &neg_flags,
 114                                          &netlogon_pipe);
 115
 116         /* We return NT_STATUS_INVALID_NETWORK_RESPONSE if the server is refusing
 117            to negotiate schannel, but the creds were set up ok. That'll have to do. */
 118
 119         if (!NT_STATUS_IS_OK(ntret)) {
 120                 if (NT_STATUS_EQUAL(ntret, NT_STATUS_INVALID_NETWORK_RESPONSE)) {
 121                         cli_shutdown(cli);
 122                         return NT_STATUS_OK;
 123                 } else {
 124                         DEBUG(0,("net_rpc_join_ok: failed to get schannel session "
 125                                         "key from server %s for domain %s. Error was %s\n",
 126                                 cli_state_remote_name(cli), domain, nt_errstr(ntret) ));
 127                         cli_shutdown(cli);
 128                         return ntret;
 129                 }
 130         }
 131
 132         /* Only do the rest of the schannel test if the client is allowed to do this. */
 133         if (!lp_client_schannel()) {
 134                 cli_shutdown(cli);
 135                 /* We're good... */
 136                 return ntret;
 137         }
 138
 139         ntret = cli_rpc_pipe_open_schannel_with_key(
 140                 cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
 141                 DCERPC_AUTH_LEVEL_PRIVACY,
 142                 domain, &netlogon_pipe->dc, &pipe_hnd);
 143
 144         if (!NT_STATUS_IS_OK(ntret)) {
 145                 DEBUG(0,("net_rpc_join_ok: failed to open schannel session "
 146                                 "on netlogon pipe to server %s for domain %s. Error was %s\n",
 147                         cli_state_remote_name(cli), domain, nt_errstr(ntret) ));
 148                 /*
 149                  * Note: here, we have:
 150                  * (pipe_hnd != NULL) if and only if NT_STATUS_IS_OK(ntret)
 151                  */
 152         }
 153
 154         cli_shutdown(cli);
 155         return ntret;
 156 }
 157
 158 /**
 159  * Join a domain using the administrator username and password
 160  *
 161  * @param argc  Standard main() style argc
 162  * @param argc  Standard main() style argv.  Initial components are already
 163  *              stripped.  Currently not used.
 164  * @return A shell status integer (0 for success)
 165  *
 166  **/
 167
 168 int net_rpc_join_newstyle(struct net_context *c, int argc, const char **argv)
 169 {
 170
 171         /* libsmb variables */
 172
 173         struct cli_state *cli;
 174         TALLOC_CTX *mem_ctx;
 175         uint32 acb_info = ACB_WSTRUST;
 176         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
 177         enum netr_SchannelType sec_channel_type;
 178         struct rpc_pipe_client *pipe_hnd = NULL;
 179         struct dcerpc_binding_handle *b = NULL;
 180
 181         /* rpc variables */
 182
 183         struct policy_handle lsa_pol, sam_pol, domain_pol, user_pol;
 184         struct dom_sid *domain_sid;
 185         uint32 user_rid;
 186
 187         /* Password stuff */
 188
 189         char *clear_trust_password = NULL;
 190         struct samr_CryptPassword crypt_pwd;
 191         uchar md4_trust_password[16];
 192         union samr_UserInfo set_info;
 193
 194         /* Misc */
 195
 196         NTSTATUS status, result;
 197         int retval = 1;
 198         const char *domain = NULL;
 199         char *acct_name;
 200         struct lsa_String lsa_acct_name;
 201         uint32 acct_flags=0;
 202         uint32_t access_granted = 0;
 203         union lsa_PolicyInformation *info = NULL;
 204         struct samr_Ids user_rids;
 205         struct samr_Ids name_types;
 206
 207
 208         /* check what type of join */
 209         if (argc >= 0) {
 210                 sec_channel_type = get_sec_channel_type(argv[0]);
 211         } else {
 212                 sec_channel_type = get_sec_channel_type(NULL);
 213         }
 214
 215         switch (sec_channel_type) {
 216         case SEC_CHAN_WKSTA:
 217                 acb_info = ACB_WSTRUST;
 218                 break;
 219         case SEC_CHAN_BDC:
 220                 acb_info = ACB_SVRTRUST;
 221                 break;
 222 #if 0
 223         case SEC_CHAN_DOMAIN:
 224                 acb_info = ACB_DOMTRUST;
 225                 break;
 226 #endif
 227         default:
 228                 DEBUG(0,("secure channel type %d not yet supported\n",
 229                         sec_channel_type));
 230                 break;
 231         }
 232
 233         /* Make authenticated connection to remote machine */
 234
 235         status = net_make_ipc_connection(c, NET_FLAGS_PDC, &cli);
 236         if (!NT_STATUS_IS_OK(status)) {
 237                 return 1;
 238         }
 239
 240         if (!(mem_ctx = talloc_init("net_rpc_join_newstyle"))) {
 241                 DEBUG(0, ("Could not initialise talloc context\n"));
 242                 goto done;
 243         }
 244
 245         /* Fetch domain sid */
 246
 247         status = cli_rpc_pipe_open_noauth(cli, &ndr_table_lsarpc.syntax_id,
 248                                           &pipe_hnd);
 249         if (!NT_STATUS_IS_OK(status)) {
 250                 DEBUG(0, ("Error connecting to LSA pipe. Error was %s\n",
 251                         nt_errstr(status) ));
 252                 goto done;
 253         }
 254
 255         b = pipe_hnd->binding_handle;
 256
 257         CHECK_RPC_ERR(rpccli_lsa_open_policy(pipe_hnd, mem_ctx, true,
 258                                           SEC_FLAG_MAXIMUM_ALLOWED,
 259                                           &lsa_pol),
 260                       "error opening lsa policy handle");
 261
 262         CHECK_DCERPC_ERR(dcerpc_lsa_QueryInfoPolicy(b, mem_ctx,
 263                                                     &lsa_pol,
 264                                                     LSA_POLICY_INFO_ACCOUNT_DOMAIN,
 265                                                     &info,
 266                                                     &result),
 267                       "error querying info policy");
 268
 269         domain = info->account_domain.name.string;
 270         domain_sid = info->account_domain.sid;
 271
 272         dcerpc_lsa_Close(b, mem_ctx, &lsa_pol, &result);
 273         TALLOC_FREE(pipe_hnd); /* Done with this pipe */
 274
 275         /* Bail out if domain didn't get set. */
 276         if (!domain) {
 277                 DEBUG(0, ("Could not get domain name.\n"));
 278                 goto done;
 279         }
 280
 281         /* Create domain user */
 282         status = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 283                                           &pipe_hnd);
 284         if (!NT_STATUS_IS_OK(status)) {
 285                 DEBUG(0, ("Error connecting to SAM pipe. Error was %s\n",
 286                         nt_errstr(status) ));
 287                 goto done;
 288         }
 289
 290         b = pipe_hnd->binding_handle;
 291
 292         CHECK_DCERPC_ERR(dcerpc_samr_Connect2(b, mem_ctx,
 293                                               pipe_hnd->desthost,
 294                                               SAMR_ACCESS_ENUM_DOMAINS
 295                                               | SAMR_ACCESS_LOOKUP_DOMAIN,
 296                                               &sam_pol,
 297                                               &result),
 298                       "could not connect to SAM database");
 299
 300
 301         CHECK_DCERPC_ERR(dcerpc_samr_OpenDomain(b, mem_ctx,
 302                                                 &sam_pol,
 303                                                 SAMR_DOMAIN_ACCESS_LOOKUP_INFO_1
 304                                                 | SAMR_DOMAIN_ACCESS_CREATE_USER
 305                                                 | SAMR_DOMAIN_ACCESS_OPEN_ACCOUNT,
 306                                                 domain_sid,
 307                                                 &domain_pol,
 308                                                 &result),
 309                       "could not open domain");
 310
 311         /* Create domain user */
 312         if ((acct_name = talloc_asprintf(mem_ctx, "%s$", lp_netbios_name())) == NULL) {
 313                 status = NT_STATUS_NO_MEMORY;
 314                 goto done;
 315         }
 316         strlower_m(acct_name);
 317
 318         init_lsa_String(&lsa_acct_name, acct_name);
 319
 320         acct_flags = SEC_GENERIC_READ | SEC_GENERIC_WRITE | SEC_GENERIC_EXECUTE |
 321                      SEC_STD_WRITE_DAC | SEC_STD_DELETE |
 322                      SAMR_USER_ACCESS_SET_PASSWORD |
 323                      SAMR_USER_ACCESS_GET_ATTRIBUTES |
 324                      SAMR_USER_ACCESS_SET_ATTRIBUTES;
 325
 326         DEBUG(10, ("Creating account with flags: %d\n",acct_flags));
 327
 328         status = dcerpc_samr_CreateUser2(b, mem_ctx,
 329                                          &domain_pol,
 330                                          &lsa_acct_name,
 331                                          acb_info,
 332                                          acct_flags,
 333                                          &user_pol,
 334                                          &access_granted,
 335                                          &user_rid,
 336                                          &result);
 337         if (!NT_STATUS_IS_OK(status)) {
 338                 goto done;
 339         }
 340         if (!NT_STATUS_IS_OK(result) &&
 341             !NT_STATUS_EQUAL(result, NT_STATUS_USER_EXISTS)) {
 342                 status = result;
 343                 d_fprintf(stderr,_("Creation of workstation account failed\n"));
 344
 345                 /* If NT_STATUS_ACCESS_DENIED then we have a valid
 346                    username/password combo but the user does not have
 347                    administrator access. */
 348
 349                 if (NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED))
 350                         d_fprintf(stderr, _("User specified does not have "
 351                                             "administrator privileges\n"));
 352
 353                 goto done;
 354         }
 355
 356         /* We *must* do this.... don't ask... */
 357
 358         if (NT_STATUS_IS_OK(result)) {
 359                 dcerpc_samr_Close(b, mem_ctx, &user_pol, &result);
 360         }
 361
 362         CHECK_DCERPC_ERR_DEBUG(dcerpc_samr_LookupNames(b, mem_ctx,
 363                                                        &domain_pol,
 364                                                        1,
 365                                                        &lsa_acct_name,
 366                                                        &user_rids,
 367                                                        &name_types,
 368                                                        &result),
 369                             ("error looking up rid for user %s: %s/%s\n",
 370                              acct_name, nt_errstr(status), nt_errstr(result)));
 371
 372         if (name_types.ids[0] != SID_NAME_USER) {
 373                 DEBUG(0, ("%s is not a user account (type=%d)\n", acct_name, name_types.ids[0]));
 374                 goto done;
 375         }
 376
 377         user_rid = user_rids.ids[0];
 378
 379         /* Open handle on user */
 380
 381         CHECK_DCERPC_ERR_DEBUG(
 382                 dcerpc_samr_OpenUser(b, mem_ctx,
 383                                      &domain_pol,
 384                                      SEC_FLAG_MAXIMUM_ALLOWED,
 385                                      user_rid,
 386                                      &user_pol,
 387                                      &result),
 388                 ("could not re-open existing user %s: %s/%s\n",
 389                  acct_name, nt_errstr(status), nt_errstr(result)));
 390
 391         /* Create a random machine account password */
 392
 393         clear_trust_password = generate_random_str(talloc_tos(), DEFAULT_TRUST_ACCOUNT_PASSWORD_LENGTH);
 394         E_md4hash(clear_trust_password, md4_trust_password);
 395
 396         /* Set password on machine account */
 397
 398         init_samr_CryptPassword(clear_trust_password,
 399                                 &cli->user_session_key,
 400                                 &crypt_pwd);
 401
 402         set_info.info24.password = crypt_pwd;
 403         set_info.info24.password_expired = PASS_DONT_CHANGE_AT_NEXT_LOGON;
 404
 405         CHECK_DCERPC_ERR(dcerpc_samr_SetUserInfo2(b, mem_ctx,
 406                                                   &user_pol,
 407                                                   24,
 408                                                   &set_info,
 409                                                   &result),
 410                       "error setting trust account password");
 411
 412         /* Why do we have to try to (re-)set the ACB to be the same as what
 413            we passed in the samr_create_dom_user() call?  When a NT
 414            workstation is joined to a domain by an administrator the
 415            acb_info is set to 0x80.  For a normal user with "Add
 416            workstations to the domain" rights the acb_info is 0x84.  I'm
 417            not sure whether it is supposed to make a difference or not.  NT
 418            seems to cope with either value so don't bomb out if the set
 419            userinfo2 level 0x10 fails.  -tpot */
 420
 421         set_info.info16.acct_flags = acb_info;
 422
 423         /* Ignoring the return value is necessary for joining a domain
 424            as a normal user with "Add workstation to domain" privilege. */
 425
 426         status = dcerpc_samr_SetUserInfo(b, mem_ctx,
 427                                          &user_pol,
 428                                          16,
 429                                          &set_info,
 430                                          &result);
 431
 432         dcerpc_samr_Close(b, mem_ctx, &user_pol, &result);
 433         TALLOC_FREE(pipe_hnd); /* Done with this pipe */
 434
 435         /* Now check the whole process from top-to-bottom */
 436
 437         status = cli_rpc_pipe_open_noauth(cli, &ndr_table_netlogon.syntax_id,
 438                                           &pipe_hnd);
 439         if (!NT_STATUS_IS_OK(status)) {
 440                 DEBUG(0,("Error connecting to NETLOGON pipe. Error was %s\n",
 441                         nt_errstr(status) ));
 442                 goto done;
 443         }
 444
 445         status = rpccli_netlogon_setup_creds(pipe_hnd,
 446                                         pipe_hnd->desthost, /* server name */
 447                                         domain,        /* domain */
 448                                         lp_netbios_name(), /* client name */
 449                                         lp_netbios_name(), /* machine account name */
 450                                         md4_trust_password,
 451                                         sec_channel_type,
 452                                         &neg_flags);
 453
 454         if (!NT_STATUS_IS_OK(status)) {
 455                 DEBUG(0, ("Error in domain join verification (credential setup failed): %s\n\n",
 456                           nt_errstr(status)));
 457
 458                 if ( NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED) &&
 459                      (sec_channel_type == SEC_CHAN_BDC) ) {
 460                         d_fprintf(stderr, _("Please make sure that no computer "
 461                                             "account\nnamed like this machine "
 462                                             "(%s) exists in the domain\n"),
 463                                  lp_netbios_name());
 464                 }
 465
 466                 goto done;
 467         }
 468
 469         /* We can only check the schannel connection if the client is allowed
 470            to do this and the server supports it. If not, just assume success
 471            (after all the rpccli_netlogon_setup_creds() succeeded, and we'll
 472            do the same again (setup creds) in net_rpc_join_ok(). JRA. */
 473
 474         if (lp_client_schannel() && (neg_flags & NETLOGON_NEG_SCHANNEL)) {
 475                 struct rpc_pipe_client *netlogon_schannel_pipe;
 476
 477                 status = cli_rpc_pipe_open_schannel_with_key(
 478                         cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
 479                         DCERPC_AUTH_LEVEL_PRIVACY, domain, &pipe_hnd->dc,
 480                         &netlogon_schannel_pipe);
 481
 482                 if (!NT_STATUS_IS_OK(status)) {
 483                         DEBUG(0, ("Error in domain join verification (schannel setup failed): %s\n\n",
 484                                   nt_errstr(status)));
 485
 486                         if ( NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED) &&
 487                              (sec_channel_type == SEC_CHAN_BDC) ) {
 488                                 d_fprintf(stderr, _("Please make sure that no "
 489                                                     "computer account\nnamed "
 490                                                     "like this machine (%s) "
 491                                                     "exists in the domain\n"),
 492                                          lp_netbios_name());
 493                         }
 494
 495                         goto done;
 496                 }
 497                 TALLOC_FREE(netlogon_schannel_pipe);
 498         }
 499
 500         TALLOC_FREE(pipe_hnd);
 501
 502         /* Now store the secret in the secrets database */
 503
 504         strupper_m(discard_const_p(char, domain));
 505
 506         if (!secrets_store_domain_sid(domain, domain_sid)) {
 507                 DEBUG(0, ("error storing domain sid for %s\n", domain));
 508                 goto done;
 509         }
 510
 511         if (!secrets_store_machine_password(clear_trust_password, domain, sec_channel_type)) {
 512                 DEBUG(0, ("error storing plaintext domain secrets for %s\n", domain));
 513         }
 514
 515         /* double-check, connection from scratch */
 516         status = net_rpc_join_ok(c, domain, cli_state_remote_name(cli),
 517                                  smbXcli_conn_remote_sockaddr(cli->conn));
 518         retval = NT_STATUS_IS_OK(status) ? 0 : -1;
 519
 520 done:
 521
 522         /* Display success or failure */
 523
 524         if (domain) {
 525                 if (retval != 0) {
 526                         fprintf(stderr,_("Unable to join domain %s.\n"),domain);
 527                 } else {
 528                         printf(_("Joined domain %s.\n"),domain);
 529                 }
 530         }
 531
 532         cli_shutdown(cli);
 533
 534         TALLOC_FREE(clear_trust_password);
 535
 536         return retval;
 537 }
 538
 539 /**
 540  * check that a join is OK
 541  *
 542  * @return A shell status integer (0 for success)
 543  *
 544  **/
 545 int net_rpc_testjoin(struct net_context *c, int argc, const char **argv)
 546 {
 547         NTSTATUS nt_status;
 548
 549         if (c->display_usage) {
 550                 d_printf(_("Usage\n"
 551                            "net rpc testjoin\n"
 552                            "    Test if a join is OK\n"));
 553                 return 0;
 554         }
 555
 556         /* Display success or failure */
 557         nt_status = net_rpc_join_ok(c, c->opt_target_workgroup, NULL, NULL);
 558         if (!NT_STATUS_IS_OK(nt_status)) {
 559                 fprintf(stderr, _("Join to domain '%s' is not valid: %s\n"),
 560                         c->opt_target_workgroup, nt_errstr(nt_status));
 561                 return -1;
 562         }
 563
 564         printf(_("Join to '%s' is OK\n"), c->opt_target_workgroup);
 565         return 0;
 566 }