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