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