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