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                                 smbXcli_conn_remote_name(cli->conn), 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                         smbXcli_conn_remote_name(cli->conn), 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         DATA_BLOB session_key = data_blob_null;
 190         char *clear_trust_password = NULL;
 191         struct samr_CryptPassword crypt_pwd;
 192         uchar md4_trust_password[16];
 193         union samr_UserInfo set_info;
 194
 195         /* Misc */
 196
 197         NTSTATUS status, result;
 198         int retval = 1;
 199         const char *domain = NULL;
 200         char *acct_name;
 201         struct lsa_String lsa_acct_name;
 202         uint32 acct_flags=0;
 203         uint32_t access_granted = 0;
 204         union lsa_PolicyInformation *info = NULL;
 205         struct samr_Ids user_rids;
 206         struct samr_Ids name_types;
 207
 208
 209         /* check what type of join */
 210         if (argc >= 0) {
 211                 sec_channel_type = get_sec_channel_type(argv[0]);
 212         } else {
 213                 sec_channel_type = get_sec_channel_type(NULL);
 214         }
 215
 216         switch (sec_channel_type) {
 217         case SEC_CHAN_WKSTA:
 218                 acb_info = ACB_WSTRUST;
 219                 break;
 220         case SEC_CHAN_BDC:
 221                 acb_info = ACB_SVRTRUST;
 222                 break;
 223 #if 0
 224         case SEC_CHAN_DOMAIN:
 225                 acb_info = ACB_DOMTRUST;
 226                 break;
 227 #endif
 228         default:
 229                 DEBUG(0,("secure channel type %d not yet supported\n",
 230                         sec_channel_type));
 231                 break;
 232         }
 233
 234         /* Make authenticated connection to remote machine */
 235
 236         status = net_make_ipc_connection(c, NET_FLAGS_PDC, &cli);
 237         if (!NT_STATUS_IS_OK(status)) {
 238                 return 1;
 239         }
 240
 241         if (!(mem_ctx = talloc_init("net_rpc_join_newstyle"))) {
 242                 DEBUG(0, ("Could not initialise talloc context\n"));
 243                 goto done;
 244         }
 245
 246         /* Fetch domain sid */
 247
 248         status = cli_rpc_pipe_open_noauth(cli, &ndr_table_lsarpc.syntax_id,
 249                                           &pipe_hnd);
 250         if (!NT_STATUS_IS_OK(status)) {
 251                 DEBUG(0, ("Error connecting to LSA pipe. Error was %s\n",
 252                         nt_errstr(status) ));
 253                 goto done;
 254         }
 255
 256         b = pipe_hnd->binding_handle;
 257
 258         CHECK_RPC_ERR(rpccli_lsa_open_policy(pipe_hnd, mem_ctx, true,
 259                                           SEC_FLAG_MAXIMUM_ALLOWED,
 260                                           &lsa_pol),
 261                       "error opening lsa policy handle");
 262
 263         CHECK_DCERPC_ERR(dcerpc_lsa_QueryInfoPolicy(b, mem_ctx,
 264                                                     &lsa_pol,
 265                                                     LSA_POLICY_INFO_ACCOUNT_DOMAIN,
 266                                                     &info,
 267                                                     &result),
 268                       "error querying info policy");
 269
 270         domain = info->account_domain.name.string;
 271         domain_sid = info->account_domain.sid;
 272
 273         dcerpc_lsa_Close(b, mem_ctx, &lsa_pol, &result);
 274         TALLOC_FREE(pipe_hnd); /* Done with this pipe */
 275
 276         /* Bail out if domain didn't get set. */
 277         if (!domain) {
 278                 DEBUG(0, ("Could not get domain name.\n"));
 279                 goto done;
 280         }
 281
 282         /* Create domain user */
 283         status = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 284                                           &pipe_hnd);
 285         if (!NT_STATUS_IS_OK(status)) {
 286                 DEBUG(0, ("Error connecting to SAM pipe. Error was %s\n",
 287                         nt_errstr(status) ));
 288                 goto done;
 289         }
 290
 291         b = pipe_hnd->binding_handle;
 292
 293         status = cli_get_session_key(mem_ctx, pipe_hnd, &session_key);
 294         if (!NT_STATUS_IS_OK(status)) {
 295                 DEBUG(0,("Error getting session_key of SAM pipe. Error was %s\n",
 296                         nt_errstr(status)));
 297                 goto done;
 298         }
 299
 300         CHECK_DCERPC_ERR(dcerpc_samr_Connect2(b, mem_ctx,
 301                                               pipe_hnd->desthost,
 302                                               SAMR_ACCESS_ENUM_DOMAINS
 303                                               | SAMR_ACCESS_LOOKUP_DOMAIN,
 304                                               &sam_pol,
 305                                               &result),
 306                       "could not connect to SAM database");
 307
 308
 309         CHECK_DCERPC_ERR(dcerpc_samr_OpenDomain(b, mem_ctx,
 310                                                 &sam_pol,
 311                                                 SAMR_DOMAIN_ACCESS_LOOKUP_INFO_1
 312                                                 | SAMR_DOMAIN_ACCESS_CREATE_USER
 313                                                 | SAMR_DOMAIN_ACCESS_OPEN_ACCOUNT,
 314                                                 domain_sid,
 315                                                 &domain_pol,
 316                                                 &result),
 317                       "could not open domain");
 318
 319         /* Create domain user */
 320         if ((acct_name = talloc_asprintf(mem_ctx, "%s$", lp_netbios_name())) == NULL) {
 321                 status = NT_STATUS_NO_MEMORY;
 322                 goto done;
 323         }
 324         strlower_m(acct_name);
 325
 326         init_lsa_String(&lsa_acct_name, acct_name);
 327
 328         acct_flags = SEC_GENERIC_READ | SEC_GENERIC_WRITE | SEC_GENERIC_EXECUTE |
 329                      SEC_STD_WRITE_DAC | SEC_STD_DELETE |
 330                      SAMR_USER_ACCESS_SET_PASSWORD |
 331                      SAMR_USER_ACCESS_GET_ATTRIBUTES |
 332                      SAMR_USER_ACCESS_SET_ATTRIBUTES;
 333
 334         DEBUG(10, ("Creating account with flags: %d\n",acct_flags));
 335
 336         status = dcerpc_samr_CreateUser2(b, mem_ctx,
 337                                          &domain_pol,
 338                                          &lsa_acct_name,
 339                                          acb_info,
 340                                          acct_flags,
 341                                          &user_pol,
 342                                          &access_granted,
 343                                          &user_rid,
 344                                          &result);
 345         if (!NT_STATUS_IS_OK(status)) {
 346                 goto done;
 347         }
 348         if (!NT_STATUS_IS_OK(result) &&
 349             !NT_STATUS_EQUAL(result, NT_STATUS_USER_EXISTS)) {
 350                 status = result;
 351                 d_fprintf(stderr,_("Creation of workstation account failed\n"));
 352
 353                 /* If NT_STATUS_ACCESS_DENIED then we have a valid
 354                    username/password combo but the user does not have
 355                    administrator access. */
 356
 357                 if (NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED))
 358                         d_fprintf(stderr, _("User specified does not have "
 359                                             "administrator privileges\n"));
 360
 361                 goto done;
 362         }
 363
 364         /* We *must* do this.... don't ask... */
 365
 366         if (NT_STATUS_IS_OK(result)) {
 367                 dcerpc_samr_Close(b, mem_ctx, &user_pol, &result);
 368         }
 369
 370         CHECK_DCERPC_ERR_DEBUG(dcerpc_samr_LookupNames(b, mem_ctx,
 371                                                        &domain_pol,
 372                                                        1,
 373                                                        &lsa_acct_name,
 374                                                        &user_rids,
 375                                                        &name_types,
 376                                                        &result),
 377                             ("error looking up rid for user %s: %s/%s\n",
 378                              acct_name, nt_errstr(status), nt_errstr(result)));
 379
 380         if (name_types.ids[0] != SID_NAME_USER) {
 381                 DEBUG(0, ("%s is not a user account (type=%d)\n", acct_name, name_types.ids[0]));
 382                 goto done;
 383         }
 384
 385         user_rid = user_rids.ids[0];
 386
 387         /* Open handle on user */
 388
 389         CHECK_DCERPC_ERR_DEBUG(
 390                 dcerpc_samr_OpenUser(b, mem_ctx,
 391                                      &domain_pol,
 392                                      SEC_FLAG_MAXIMUM_ALLOWED,
 393                                      user_rid,
 394                                      &user_pol,
 395                                      &result),
 396                 ("could not re-open existing user %s: %s/%s\n",
 397                  acct_name, nt_errstr(status), nt_errstr(result)));
 398
 399         /* Create a random machine account password */
 400
 401         clear_trust_password = generate_random_str(talloc_tos(), DEFAULT_TRUST_ACCOUNT_PASSWORD_LENGTH);
 402         E_md4hash(clear_trust_password, md4_trust_password);
 403
 404         /* Set password on machine account */
 405
 406         init_samr_CryptPassword(clear_trust_password,
 407                                 &session_key,
 408                                 &crypt_pwd);
 409
 410         set_info.info24.password = crypt_pwd;
 411         set_info.info24.password_expired = PASS_DONT_CHANGE_AT_NEXT_LOGON;
 412
 413         CHECK_DCERPC_ERR(dcerpc_samr_SetUserInfo2(b, mem_ctx,
 414                                                   &user_pol,
 415                                                   24,
 416                                                   &set_info,
 417                                                   &result),
 418                       "error setting trust account password");
 419
 420         /* Why do we have to try to (re-)set the ACB to be the same as what
 421            we passed in the samr_create_dom_user() call?  When a NT
 422            workstation is joined to a domain by an administrator the
 423            acb_info is set to 0x80.  For a normal user with "Add
 424            workstations to the domain" rights the acb_info is 0x84.  I'm
 425            not sure whether it is supposed to make a difference or not.  NT
 426            seems to cope with either value so don't bomb out if the set
 427            userinfo2 level 0x10 fails.  -tpot */
 428
 429         set_info.info16.acct_flags = acb_info;
 430
 431         /* Ignoring the return value is necessary for joining a domain
 432            as a normal user with "Add workstation to domain" privilege. */
 433
 434         status = dcerpc_samr_SetUserInfo(b, mem_ctx,
 435                                          &user_pol,
 436                                          16,
 437                                          &set_info,
 438                                          &result);
 439
 440         dcerpc_samr_Close(b, mem_ctx, &user_pol, &result);
 441         TALLOC_FREE(pipe_hnd); /* Done with this pipe */
 442
 443         /* Now check the whole process from top-to-bottom */
 444
 445         status = cli_rpc_pipe_open_noauth(cli, &ndr_table_netlogon.syntax_id,
 446                                           &pipe_hnd);
 447         if (!NT_STATUS_IS_OK(status)) {
 448                 DEBUG(0,("Error connecting to NETLOGON pipe. Error was %s\n",
 449                         nt_errstr(status) ));
 450                 goto done;
 451         }
 452
 453         status = rpccli_netlogon_setup_creds(pipe_hnd,
 454                                         pipe_hnd->desthost, /* server name */
 455                                         domain,        /* domain */
 456                                         lp_netbios_name(), /* client name */
 457                                         lp_netbios_name(), /* machine account name */
 458                                         md4_trust_password,
 459                                         sec_channel_type,
 460                                         &neg_flags);
 461
 462         if (!NT_STATUS_IS_OK(status)) {
 463                 DEBUG(0, ("Error in domain join verification (credential setup failed): %s\n\n",
 464                           nt_errstr(status)));
 465
 466                 if ( NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED) &&
 467                      (sec_channel_type == SEC_CHAN_BDC) ) {
 468                         d_fprintf(stderr, _("Please make sure that no computer "
 469                                             "account\nnamed like this machine "
 470                                             "(%s) exists in the domain\n"),
 471                                  lp_netbios_name());
 472                 }
 473
 474                 goto done;
 475         }
 476
 477         /* We can only check the schannel connection if the client is allowed
 478            to do this and the server supports it. If not, just assume success
 479            (after all the rpccli_netlogon_setup_creds() succeeded, and we'll
 480            do the same again (setup creds) in net_rpc_join_ok(). JRA. */
 481
 482         if (lp_client_schannel() && (neg_flags & NETLOGON_NEG_SCHANNEL)) {
 483                 struct rpc_pipe_client *netlogon_schannel_pipe;
 484
 485                 status = cli_rpc_pipe_open_schannel_with_key(
 486                         cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
 487                         DCERPC_AUTH_LEVEL_PRIVACY, domain, &pipe_hnd->dc,
 488                         &netlogon_schannel_pipe);
 489
 490                 if (!NT_STATUS_IS_OK(status)) {
 491                         DEBUG(0, ("Error in domain join verification (schannel setup failed): %s\n\n",
 492                                   nt_errstr(status)));
 493
 494                         if ( NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED) &&
 495                              (sec_channel_type == SEC_CHAN_BDC) ) {
 496                                 d_fprintf(stderr, _("Please make sure that no "
 497                                                     "computer account\nnamed "
 498                                                     "like this machine (%s) "
 499                                                     "exists in the domain\n"),
 500                                          lp_netbios_name());
 501                         }
 502
 503                         goto done;
 504                 }
 505                 TALLOC_FREE(netlogon_schannel_pipe);
 506         }
 507
 508         TALLOC_FREE(pipe_hnd);
 509
 510         /* Now store the secret in the secrets database */
 511
 512         if (!strupper_m(discard_const_p(char, domain))) {
 513                 DEBUG(0, ("strupper_m %s failed\n", domain));
 514                 goto done;
 515         }
 516
 517         if (!secrets_store_domain_sid(domain, domain_sid)) {
 518                 DEBUG(0, ("error storing domain sid for %s\n", domain));
 519                 goto done;
 520         }
 521
 522         if (!secrets_store_machine_password(clear_trust_password, domain, sec_channel_type)) {
 523                 DEBUG(0, ("error storing plaintext domain secrets for %s\n", domain));
 524         }
 525
 526         /* double-check, connection from scratch */
 527         status = net_rpc_join_ok(c, domain, smbXcli_conn_remote_name(cli->conn),
 528                                  smbXcli_conn_remote_sockaddr(cli->conn));
 529         retval = NT_STATUS_IS_OK(status) ? 0 : -1;
 530
 531 done:
 532
 533         /* Display success or failure */
 534
 535         if (domain) {
 536                 if (retval != 0) {
 537                         fprintf(stderr,_("Unable to join domain %s.\n"),domain);
 538                 } else {
 539                         printf(_("Joined domain %s.\n"),domain);
 540                 }
 541         }
 542
 543         cli_shutdown(cli);
 544
 545         TALLOC_FREE(clear_trust_password);
 546         data_blob_clear_free(&session_key);
 547
 548         return retval;
 549 }
 550
 551 /**
 552  * check that a join is OK
 553  *
 554  * @return A shell status integer (0 for success)
 555  *
 556  **/
 557 int net_rpc_testjoin(struct net_context *c, int argc, const char **argv)
 558 {
 559         NTSTATUS nt_status;
 560
 561         if (c->display_usage) {
 562                 d_printf(_("Usage\n"
 563                            "net rpc testjoin\n"
 564                            "    Test if a join is OK\n"));
 565                 return 0;
 566         }
 567
 568         /* Display success or failure */
 569         nt_status = net_rpc_join_ok(c, c->opt_target_workgroup, NULL, NULL);
 570         if (!NT_STATUS_IS_OK(nt_status)) {
 571                 fprintf(stderr, _("Join to domain '%s' is not valid: %s\n"),
 572                         c->opt_target_workgroup, nt_errstr(nt_status));
 573                 return -1;
 574         }
 575
 576         printf(_("Join to '%s' is OK\n"), c->opt_target_workgroup);
 577         return 0;
 578 }