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