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