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