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