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/cli_lsa.h"
  25 #include "rpc_client/cli_lsarpc.h"
  26 #include "../librpc/gen_ndr/cli_samr.h"
  27 #include "rpc_client/init_samr.h"
  28 #include "../librpc/gen_ndr/ndr_netlogon.h"
  29 #include "rpc_client/cli_netlogon.h"
  30
  31 /* Macro for checking RPC error codes to make things more readable */
  32
  33 #define CHECK_RPC_ERR(rpc, msg) \
  34         if (!NT_STATUS_IS_OK(result = rpc)) { \
  35                 DEBUG(0, (msg ": %s\n", nt_errstr(result))); \
  36                 goto done; \
  37         }
  38
  39 #define CHECK_RPC_ERR_DEBUG(rpc, debug_args) \
  40         if (!NT_STATUS_IS_OK(result = rpc)) { \
  41                 DEBUG(0, debug_args); \
  42                 goto done; \
  43         }
  44
  45 /**
  46  * confirm that a domain join is still valid
  47  *
  48  * @return A shell status integer (0 for success)
  49  *
  50  **/
  51 NTSTATUS net_rpc_join_ok(struct net_context *c, const char *domain,
  52                          const char *server, struct sockaddr_storage *pss)
  53 {
  54         enum security_types sec;
  55         unsigned int conn_flags = NET_FLAGS_PDC;
  56         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
  57         struct cli_state *cli = NULL;
  58         struct rpc_pipe_client *pipe_hnd = NULL;
  59         struct rpc_pipe_client *netlogon_pipe = NULL;
  60         NTSTATUS ntret = NT_STATUS_UNSUCCESSFUL;
  61
  62         sec = (enum security_types)lp_security();
  63
  64         if (sec == SEC_ADS) {
  65                 /* Connect to IPC$ using machine account's credentials. We don't use anonymous
  66                    connection here, as it may be denied by server's local policy. */
  67                 net_use_machine_account(c);
  68
  69         } else {
  70                 /* some servers (e.g. WinNT) don't accept machine-authenticated
  71                    smb connections */
  72                 conn_flags |= NET_FLAGS_ANONYMOUS;
  73         }
  74
  75         /* Connect to remote machine */
  76         ntret = net_make_ipc_connection_ex(c, domain, server, pss, conn_flags,
  77                                            &cli);
  78         if (!NT_STATUS_IS_OK(ntret)) {
  79                 return ntret;
  80         }
  81
  82         /* Setup the creds as though we're going to do schannel... */
  83         ntret = get_schannel_session_key(cli, domain, &neg_flags,
  84                                          &netlogon_pipe);
  85
  86         /* We return NT_STATUS_INVALID_NETWORK_RESPONSE if the server is refusing
  87            to negotiate schannel, but the creds were set up ok. That'll have to do. */
  88
  89         if (!NT_STATUS_IS_OK(ntret)) {
  90                 if (NT_STATUS_EQUAL(ntret, NT_STATUS_INVALID_NETWORK_RESPONSE)) {
  91                         cli_shutdown(cli);
  92                         return NT_STATUS_OK;
  93                 } else {
  94                         DEBUG(0,("net_rpc_join_ok: failed to get schannel session "
  95                                         "key from server %s for domain %s. Error was %s\n",
  96                                 cli->desthost, domain, nt_errstr(ntret) ));
  97                         cli_shutdown(cli);
  98                         return ntret;
  99                 }
 100         }
 101
 102         /* Only do the rest of the schannel test if the client is allowed to do this. */
 103         if (!lp_client_schannel()) {
 104                 cli_shutdown(cli);
 105                 /* We're good... */
 106                 return ntret;
 107         }
 108
 109         ntret = cli_rpc_pipe_open_schannel_with_key(
 110                 cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
 111                 DCERPC_AUTH_LEVEL_PRIVACY,
 112                 domain, &netlogon_pipe->dc, &pipe_hnd);
 113
 114         if (!NT_STATUS_IS_OK(ntret)) {
 115                 DEBUG(0,("net_rpc_join_ok: failed to open schannel session "
 116                                 "on netlogon pipe to server %s for domain %s. Error was %s\n",
 117                         cli->desthost, domain, nt_errstr(ntret) ));
 118                 /*
 119                  * Note: here, we have:
 120                  * (pipe_hnd != NULL) if and only if NT_STATUS_IS_OK(ntret)
 121                  */
 122         }
 123
 124         cli_shutdown(cli);
 125         return ntret;
 126 }
 127
 128 /**
 129  * Join a domain using the administrator username and password
 130  *
 131  * @param argc  Standard main() style argc
 132  * @param argc  Standard main() style argv.  Initial components are already
 133  *              stripped.  Currently not used.
 134  * @return A shell status integer (0 for success)
 135  *
 136  **/
 137
 138 int net_rpc_join_newstyle(struct net_context *c, int argc, const char **argv)
 139 {
 140
 141         /* libsmb variables */
 142
 143         struct cli_state *cli;
 144         TALLOC_CTX *mem_ctx;
 145         uint32 acb_info = ACB_WSTRUST;
 146         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
 147         enum netr_SchannelType sec_channel_type;
 148         struct rpc_pipe_client *pipe_hnd = NULL;
 149
 150         /* rpc variables */
 151
 152         struct policy_handle lsa_pol, sam_pol, domain_pol, user_pol;
 153         struct dom_sid *domain_sid;
 154         uint32 user_rid;
 155
 156         /* Password stuff */
 157
 158         char *clear_trust_password = NULL;
 159         struct samr_CryptPassword crypt_pwd;
 160         uchar md4_trust_password[16];
 161         union samr_UserInfo set_info;
 162
 163         /* Misc */
 164
 165         NTSTATUS result;
 166         int retval = 1;
 167         const char *domain = NULL;
 168         char *acct_name;
 169         struct lsa_String lsa_acct_name;
 170         uint32 acct_flags=0;
 171         uint32_t access_granted = 0;
 172         union lsa_PolicyInformation *info = NULL;
 173         struct samr_Ids user_rids;
 174         struct samr_Ids name_types;
 175
 176         /* check what type of join */
 177         if (argc >= 0) {
 178                 sec_channel_type = get_sec_channel_type(argv[0]);
 179         } else {
 180                 sec_channel_type = get_sec_channel_type(NULL);
 181         }
 182
 183         switch (sec_channel_type) {
 184         case SEC_CHAN_WKSTA:
 185                 acb_info = ACB_WSTRUST;
 186                 break;
 187         case SEC_CHAN_BDC:
 188                 acb_info = ACB_SVRTRUST;
 189                 break;
 190 #if 0
 191         case SEC_CHAN_DOMAIN:
 192                 acb_info = ACB_DOMTRUST;
 193                 break;
 194 #endif
 195         default:
 196                 DEBUG(0,("secure channel type %d not yet supported\n",
 197                         sec_channel_type));
 198                 break;
 199         }
 200
 201         /* Make authenticated connection to remote machine */
 202
 203         result = net_make_ipc_connection(c, NET_FLAGS_PDC, &cli);
 204         if (!NT_STATUS_IS_OK(result)) {
 205                 return 1;
 206         }
 207
 208         if (!(mem_ctx = talloc_init("net_rpc_join_newstyle"))) {
 209                 DEBUG(0, ("Could not initialise talloc context\n"));
 210                 goto done;
 211         }
 212
 213         /* Fetch domain sid */
 214
 215         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_lsarpc.syntax_id,
 216                                           &pipe_hnd);
 217         if (!NT_STATUS_IS_OK(result)) {
 218                 DEBUG(0, ("Error connecting to LSA pipe. Error was %s\n",
 219                         nt_errstr(result) ));
 220                 goto done;
 221         }
 222
 223
 224         CHECK_RPC_ERR(rpccli_lsa_open_policy(pipe_hnd, mem_ctx, true,
 225                                           SEC_FLAG_MAXIMUM_ALLOWED,
 226                                           &lsa_pol),
 227                       "error opening lsa policy handle");
 228
 229         CHECK_RPC_ERR(rpccli_lsa_QueryInfoPolicy(pipe_hnd, mem_ctx,
 230                                                  &lsa_pol,
 231                                                  LSA_POLICY_INFO_ACCOUNT_DOMAIN,
 232                                                  &info),
 233                       "error querying info policy");
 234
 235         domain = info->account_domain.name.string;
 236         domain_sid = info->account_domain.sid;
 237
 238         rpccli_lsa_Close(pipe_hnd, mem_ctx, &lsa_pol);
 239         TALLOC_FREE(pipe_hnd); /* Done with this pipe */
 240
 241         /* Bail out if domain didn't get set. */
 242         if (!domain) {
 243                 DEBUG(0, ("Could not get domain name.\n"));
 244                 goto done;
 245         }
 246
 247         /* Create domain user */
 248         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 249                                           &pipe_hnd);
 250         if (!NT_STATUS_IS_OK(result)) {
 251                 DEBUG(0, ("Error connecting to SAM pipe. Error was %s\n",
 252                         nt_errstr(result) ));
 253                 goto done;
 254         }
 255
 256         CHECK_RPC_ERR(rpccli_samr_Connect2(pipe_hnd, mem_ctx,
 257                                            pipe_hnd->desthost,
 258                                            SAMR_ACCESS_ENUM_DOMAINS
 259                                            | SAMR_ACCESS_LOOKUP_DOMAIN,
 260                                            &sam_pol),
 261                       "could not connect to SAM database");
 262
 263
 264         CHECK_RPC_ERR(rpccli_samr_OpenDomain(pipe_hnd, mem_ctx,
 265                                              &sam_pol,
 266                                              SAMR_DOMAIN_ACCESS_LOOKUP_INFO_1
 267                                              | SAMR_DOMAIN_ACCESS_CREATE_USER
 268                                              | SAMR_DOMAIN_ACCESS_OPEN_ACCOUNT,
 269                                              domain_sid,
 270                                              &domain_pol),
 271                       "could not open domain");
 272
 273         /* Create domain user */
 274         if ((acct_name = talloc_asprintf(mem_ctx, "%s$", global_myname())) == NULL) {
 275                 result = NT_STATUS_NO_MEMORY;
 276                 goto done;
 277         }
 278         strlower_m(acct_name);
 279
 280         init_lsa_String(&lsa_acct_name, acct_name);
 281
 282         acct_flags = SEC_GENERIC_READ | SEC_GENERIC_WRITE | SEC_GENERIC_EXECUTE |
 283                      SEC_STD_WRITE_DAC | SEC_STD_DELETE |
 284                      SAMR_USER_ACCESS_SET_PASSWORD |
 285                      SAMR_USER_ACCESS_GET_ATTRIBUTES |
 286                      SAMR_USER_ACCESS_SET_ATTRIBUTES;
 287
 288         DEBUG(10, ("Creating account with flags: %d\n",acct_flags));
 289
 290         result = rpccli_samr_CreateUser2(pipe_hnd, mem_ctx,
 291                                          &domain_pol,
 292                                          &lsa_acct_name,
 293                                          acb_info,
 294                                          acct_flags,
 295                                          &user_pol,
 296                                          &access_granted,
 297                                          &user_rid);
 298
 299         if (!NT_STATUS_IS_OK(result) &&
 300             !NT_STATUS_EQUAL(result, NT_STATUS_USER_EXISTS)) {
 301                 d_fprintf(stderr,_("Creation of workstation account failed\n"));
 302
 303                 /* If NT_STATUS_ACCESS_DENIED then we have a valid
 304                    username/password combo but the user does not have
 305                    administrator access. */
 306
 307                 if (NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED))
 308                         d_fprintf(stderr, _("User specified does not have "
 309                                             "administrator privileges\n"));
 310
 311                 goto done;
 312         }
 313
 314         /* We *must* do this.... don't ask... */
 315
 316         if (NT_STATUS_IS_OK(result)) {
 317                 rpccli_samr_Close(pipe_hnd, mem_ctx, &user_pol);
 318         }
 319
 320         CHECK_RPC_ERR_DEBUG(rpccli_samr_LookupNames(pipe_hnd, mem_ctx,
 321                                                     &domain_pol,
 322                                                     1,
 323                                                     &lsa_acct_name,
 324                                                     &user_rids,
 325                                                     &name_types),
 326                             ("error looking up rid for user %s: %s\n",
 327                              acct_name, nt_errstr(result)));
 328
 329         if (name_types.ids[0] != SID_NAME_USER) {
 330                 DEBUG(0, ("%s is not a user account (type=%d)\n", acct_name, name_types.ids[0]));
 331                 goto done;
 332         }
 333
 334         user_rid = user_rids.ids[0];
 335
 336         /* Open handle on user */
 337
 338         CHECK_RPC_ERR_DEBUG(
 339                 rpccli_samr_OpenUser(pipe_hnd, mem_ctx,
 340                                      &domain_pol,
 341                                      SEC_FLAG_MAXIMUM_ALLOWED,
 342                                      user_rid,
 343                                      &user_pol),
 344                 ("could not re-open existing user %s: %s\n",
 345                  acct_name, nt_errstr(result)));
 346
 347         /* Create a random machine account password */
 348
 349         clear_trust_password = generate_random_str(talloc_tos(), DEFAULT_TRUST_ACCOUNT_PASSWORD_LENGTH);
 350         E_md4hash(clear_trust_password, md4_trust_password);
 351
 352         /* Set password on machine account */
 353
 354         init_samr_CryptPassword(clear_trust_password,
 355                                 &cli->user_session_key,
 356                                 &crypt_pwd);
 357
 358         set_info.info24.password = crypt_pwd;
 359         set_info.info24.password_expired = PASS_DONT_CHANGE_AT_NEXT_LOGON;
 360
 361         CHECK_RPC_ERR(rpccli_samr_SetUserInfo2(pipe_hnd, mem_ctx,
 362                                                &user_pol,
 363                                                24,
 364                                                &set_info),
 365                       "error setting trust account password");
 366
 367         /* Why do we have to try to (re-)set the ACB to be the same as what
 368            we passed in the samr_create_dom_user() call?  When a NT
 369            workstation is joined to a domain by an administrator the
 370            acb_info is set to 0x80.  For a normal user with "Add
 371            workstations to the domain" rights the acb_info is 0x84.  I'm
 372            not sure whether it is supposed to make a difference or not.  NT
 373            seems to cope with either value so don't bomb out if the set
 374            userinfo2 level 0x10 fails.  -tpot */
 375
 376         set_info.info16.acct_flags = acb_info;
 377
 378         /* Ignoring the return value is necessary for joining a domain
 379            as a normal user with "Add workstation to domain" privilege. */
 380
 381         result = rpccli_samr_SetUserInfo(pipe_hnd, mem_ctx,
 382                                          &user_pol,
 383                                          16,
 384                                          &set_info);
 385
 386         rpccli_samr_Close(pipe_hnd, mem_ctx, &user_pol);
 387         TALLOC_FREE(pipe_hnd); /* Done with this pipe */
 388
 389         /* Now check the whole process from top-to-bottom */
 390
 391         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_netlogon.syntax_id,
 392                                           &pipe_hnd);
 393         if (!NT_STATUS_IS_OK(result)) {
 394                 DEBUG(0,("Error connecting to NETLOGON pipe. Error was %s\n",
 395                         nt_errstr(result) ));
 396                 goto done;
 397         }
 398
 399         result = rpccli_netlogon_setup_creds(pipe_hnd,
 400                                         cli->desthost, /* server name */
 401                                         domain,        /* domain */
 402                                         global_myname(), /* client name */
 403                                         global_myname(), /* machine account name */
 404                                         md4_trust_password,
 405                                         sec_channel_type,
 406                                         &neg_flags);
 407
 408         if (!NT_STATUS_IS_OK(result)) {
 409                 DEBUG(0, ("Error in domain join verification (credential setup failed): %s\n\n",
 410                           nt_errstr(result)));
 411
 412                 if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
 413                      (sec_channel_type == SEC_CHAN_BDC) ) {
 414                         d_fprintf(stderr, _("Please make sure that no computer "
 415                                             "account\nnamed like this machine "
 416                                             "(%s) exists in the domain\n"),
 417                                  global_myname());
 418                 }
 419
 420                 goto done;
 421         }
 422
 423         /* We can only check the schannel connection if the client is allowed
 424            to do this and the server supports it. If not, just assume success
 425            (after all the rpccli_netlogon_setup_creds() succeeded, and we'll
 426            do the same again (setup creds) in net_rpc_join_ok(). JRA. */
 427
 428         if (lp_client_schannel() && (neg_flags & NETLOGON_NEG_SCHANNEL)) {
 429                 struct rpc_pipe_client *netlogon_schannel_pipe;
 430
 431                 result = cli_rpc_pipe_open_schannel_with_key(
 432                         cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
 433                         DCERPC_AUTH_LEVEL_PRIVACY, domain, &pipe_hnd->dc,
 434                         &netlogon_schannel_pipe);
 435
 436                 if (!NT_STATUS_IS_OK(result)) {
 437                         DEBUG(0, ("Error in domain join verification (schannel setup failed): %s\n\n",
 438                                   nt_errstr(result)));
 439
 440                         if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
 441                              (sec_channel_type == SEC_CHAN_BDC) ) {
 442                                 d_fprintf(stderr, _("Please make sure that no "
 443                                                     "computer account\nnamed "
 444                                                     "like this machine (%s) "
 445                                                     "exists in the domain\n"),
 446                                          global_myname());
 447                         }
 448
 449                         goto done;
 450                 }
 451                 TALLOC_FREE(netlogon_schannel_pipe);
 452         }
 453
 454         TALLOC_FREE(pipe_hnd);
 455
 456         /* Now store the secret in the secrets database */
 457
 458         strupper_m(CONST_DISCARD(char *, domain));
 459
 460         if (!secrets_store_domain_sid(domain, domain_sid)) {
 461                 DEBUG(0, ("error storing domain sid for %s\n", domain));
 462                 goto done;
 463         }
 464
 465         if (!secrets_store_machine_password(clear_trust_password, domain, sec_channel_type)) {
 466                 DEBUG(0, ("error storing plaintext domain secrets for %s\n", domain));
 467         }
 468
 469         /* double-check, connection from scratch */
 470         result = net_rpc_join_ok(c, domain, cli->desthost, &cli->dest_ss);
 471         retval = NT_STATUS_IS_OK(result) ? 0 : -1;
 472
 473 done:
 474
 475         /* Display success or failure */
 476
 477         if (domain) {
 478                 if (retval != 0) {
 479                         fprintf(stderr,_("Unable to join domain %s.\n"),domain);
 480                 } else {
 481                         printf(_("Joined domain %s.\n"),domain);
 482                 }
 483         }
 484
 485         cli_shutdown(cli);
 486
 487         TALLOC_FREE(clear_trust_password);
 488
 489         return retval;
 490 }
 491
 492 /**
 493  * check that a join is OK
 494  *
 495  * @return A shell status integer (0 for success)
 496  *
 497  **/
 498 int net_rpc_testjoin(struct net_context *c, int argc, const char **argv)
 499 {
 500         NTSTATUS nt_status;
 501
 502         if (c->display_usage) {
 503                 d_printf(_("Usage\n"
 504                            "net rpc testjoin\n"
 505                            "    Test if a join is OK\n"));
 506                 return 0;
 507         }
 508
 509         /* Display success or failure */
 510         nt_status = net_rpc_join_ok(c, c->opt_target_workgroup, NULL, NULL);
 511         if (!NT_STATUS_IS_OK(nt_status)) {
 512                 fprintf(stderr, _("Join to domain '%s' is not valid: %s\n"),
 513                         c->opt_target_workgroup, nt_errstr(nt_status));
 514                 return -1;
 515         }
 516
 517         printf(_("Join to '%s' is OK\n"), c->opt_target_workgroup);
 518         return 0;
 519 }