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 #include "secrets.h"
  31
  32 /* Macro for checking RPC error codes to make things more readable */
  33
  34 #define CHECK_RPC_ERR(rpc, msg) \
  35         if (!NT_STATUS_IS_OK(result = rpc)) { \
  36                 DEBUG(0, (msg ": %s\n", nt_errstr(result))); \
  37                 goto done; \
  38         }
  39
  40 #define CHECK_RPC_ERR_DEBUG(rpc, debug_args) \
  41         if (!NT_STATUS_IS_OK(result = rpc)) { \
  42                 DEBUG(0, debug_args); \
  43                 goto done; \
  44         }
  45
  46 /**
  47  * confirm that a domain join is still valid
  48  *
  49  * @return A shell status integer (0 for success)
  50  *
  51  **/
  52 NTSTATUS net_rpc_join_ok(struct net_context *c, const char *domain,
  53                          const char *server, struct sockaddr_storage *pss)
  54 {
  55         enum security_types sec;
  56         unsigned int conn_flags = NET_FLAGS_PDC;
  57         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
  58         struct cli_state *cli = NULL;
  59         struct rpc_pipe_client *pipe_hnd = NULL;
  60         struct rpc_pipe_client *netlogon_pipe = NULL;
  61         NTSTATUS ntret = NT_STATUS_UNSUCCESSFUL;
  62
  63         sec = (enum security_types)lp_security();
  64
  65         if (sec == SEC_ADS) {
  66                 /* Connect to IPC$ using machine account's credentials. We don't use anonymous
  67                    connection here, as it may be denied by server's local policy. */
  68                 net_use_machine_account(c);
  69
  70         } else {
  71                 /* some servers (e.g. WinNT) don't accept machine-authenticated
  72                    smb connections */
  73                 conn_flags |= NET_FLAGS_ANONYMOUS;
  74         }
  75
  76         /* Connect to remote machine */
  77         ntret = net_make_ipc_connection_ex(c, domain, server, pss, conn_flags,
  78                                            &cli);
  79         if (!NT_STATUS_IS_OK(ntret)) {
  80                 return ntret;
  81         }
  82
  83         /* Setup the creds as though we're going to do schannel... */
  84         ntret = get_schannel_session_key(cli, domain, &neg_flags,
  85                                          &netlogon_pipe);
  86
  87         /* We return NT_STATUS_INVALID_NETWORK_RESPONSE if the server is refusing
  88            to negotiate schannel, but the creds were set up ok. That'll have to do. */
  89
  90         if (!NT_STATUS_IS_OK(ntret)) {
  91                 if (NT_STATUS_EQUAL(ntret, NT_STATUS_INVALID_NETWORK_RESPONSE)) {
  92                         cli_shutdown(cli);
  93                         return NT_STATUS_OK;
  94                 } else {
  95                         DEBUG(0,("net_rpc_join_ok: failed to get schannel session "
  96                                         "key from server %s for domain %s. Error was %s\n",
  97                                 cli->desthost, domain, nt_errstr(ntret) ));
  98                         cli_shutdown(cli);
  99                         return ntret;
 100                 }
 101         }
 102
 103         /* Only do the rest of the schannel test if the client is allowed to do this. */
 104         if (!lp_client_schannel()) {
 105                 cli_shutdown(cli);
 106                 /* We're good... */
 107                 return ntret;
 108         }
 109
 110         ntret = cli_rpc_pipe_open_schannel_with_key(
 111                 cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
 112                 DCERPC_AUTH_LEVEL_PRIVACY,
 113                 domain, &netlogon_pipe->dc, &pipe_hnd);
 114
 115         if (!NT_STATUS_IS_OK(ntret)) {
 116                 DEBUG(0,("net_rpc_join_ok: failed to open schannel session "
 117                                 "on netlogon pipe to server %s for domain %s. Error was %s\n",
 118                         cli->desthost, domain, nt_errstr(ntret) ));
 119                 /*
 120                  * Note: here, we have:
 121                  * (pipe_hnd != NULL) if and only if NT_STATUS_IS_OK(ntret)
 122                  */
 123         }
 124
 125         cli_shutdown(cli);
 126         return ntret;
 127 }
 128
 129 /**
 130  * Join a domain using the administrator username and password
 131  *
 132  * @param argc  Standard main() style argc
 133  * @param argc  Standard main() style argv.  Initial components are already
 134  *              stripped.  Currently not used.
 135  * @return A shell status integer (0 for success)
 136  *
 137  **/
 138
 139 int net_rpc_join_newstyle(struct net_context *c, int argc, const char **argv)
 140 {
 141
 142         /* libsmb variables */
 143
 144         struct cli_state *cli;
 145         TALLOC_CTX *mem_ctx;
 146         uint32 acb_info = ACB_WSTRUST;
 147         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
 148         enum netr_SchannelType sec_channel_type;
 149         struct rpc_pipe_client *pipe_hnd = NULL;
 150
 151         /* rpc variables */
 152
 153         struct policy_handle lsa_pol, sam_pol, domain_pol, user_pol;
 154         struct dom_sid *domain_sid;
 155         uint32 user_rid;
 156
 157         /* Password stuff */
 158
 159         char *clear_trust_password = NULL;
 160         struct samr_CryptPassword crypt_pwd;
 161         uchar md4_trust_password[16];
 162         union samr_UserInfo set_info;
 163
 164         /* Misc */
 165
 166         NTSTATUS result;
 167         int retval = 1;
 168         const char *domain = NULL;
 169         char *acct_name;
 170         struct lsa_String lsa_acct_name;
 171         uint32 acct_flags=0;
 172         uint32_t access_granted = 0;
 173         union lsa_PolicyInformation *info = NULL;
 174         struct samr_Ids user_rids;
 175         struct samr_Ids name_types;
 176
 177         /* check what type of join */
 178         if (argc >= 0) {
 179                 sec_channel_type = get_sec_channel_type(argv[0]);
 180         } else {
 181                 sec_channel_type = get_sec_channel_type(NULL);
 182         }
 183
 184         switch (sec_channel_type) {
 185         case SEC_CHAN_WKSTA:
 186                 acb_info = ACB_WSTRUST;
 187                 break;
 188         case SEC_CHAN_BDC:
 189                 acb_info = ACB_SVRTRUST;
 190                 break;
 191 #if 0
 192         case SEC_CHAN_DOMAIN:
 193                 acb_info = ACB_DOMTRUST;
 194                 break;
 195 #endif
 196         default:
 197                 DEBUG(0,("secure channel type %d not yet supported\n",
 198                         sec_channel_type));
 199                 break;
 200         }
 201
 202         /* Make authenticated connection to remote machine */
 203
 204         result = net_make_ipc_connection(c, NET_FLAGS_PDC, &cli);
 205         if (!NT_STATUS_IS_OK(result)) {
 206                 return 1;
 207         }
 208
 209         if (!(mem_ctx = talloc_init("net_rpc_join_newstyle"))) {
 210                 DEBUG(0, ("Could not initialise talloc context\n"));
 211                 goto done;
 212         }
 213
 214         /* Fetch domain sid */
 215
 216         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_lsarpc.syntax_id,
 217                                           &pipe_hnd);
 218         if (!NT_STATUS_IS_OK(result)) {
 219                 DEBUG(0, ("Error connecting to LSA pipe. Error was %s\n",
 220                         nt_errstr(result) ));
 221                 goto done;
 222         }
 223
 224
 225         CHECK_RPC_ERR(rpccli_lsa_open_policy(pipe_hnd, mem_ctx, true,
 226                                           SEC_FLAG_MAXIMUM_ALLOWED,
 227                                           &lsa_pol),
 228                       "error opening lsa policy handle");
 229
 230         CHECK_RPC_ERR(rpccli_lsa_QueryInfoPolicy(pipe_hnd, mem_ctx,
 231                                                  &lsa_pol,
 232                                                  LSA_POLICY_INFO_ACCOUNT_DOMAIN,
 233                                                  &info),
 234                       "error querying info policy");
 235
 236         domain = info->account_domain.name.string;
 237         domain_sid = info->account_domain.sid;
 238
 239         rpccli_lsa_Close(pipe_hnd, mem_ctx, &lsa_pol);
 240         TALLOC_FREE(pipe_hnd); /* Done with this pipe */
 241
 242         /* Bail out if domain didn't get set. */
 243         if (!domain) {
 244                 DEBUG(0, ("Could not get domain name.\n"));
 245                 goto done;
 246         }
 247
 248         /* Create domain user */
 249         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 250                                           &pipe_hnd);
 251         if (!NT_STATUS_IS_OK(result)) {
 252                 DEBUG(0, ("Error connecting to SAM pipe. Error was %s\n",
 253                         nt_errstr(result) ));
 254                 goto done;
 255         }
 256
 257         CHECK_RPC_ERR(rpccli_samr_Connect2(pipe_hnd, mem_ctx,
 258                                            pipe_hnd->desthost,
 259                                            SAMR_ACCESS_ENUM_DOMAINS
 260                                            | SAMR_ACCESS_LOOKUP_DOMAIN,
 261                                            &sam_pol),
 262                       "could not connect to SAM database");
 263
 264
 265         CHECK_RPC_ERR(rpccli_samr_OpenDomain(pipe_hnd, mem_ctx,
 266                                              &sam_pol,
 267                                              SAMR_DOMAIN_ACCESS_LOOKUP_INFO_1
 268                                              | SAMR_DOMAIN_ACCESS_CREATE_USER
 269                                              | SAMR_DOMAIN_ACCESS_OPEN_ACCOUNT,
 270                                              domain_sid,
 271                                              &domain_pol),
 272                       "could not open domain");
 273
 274         /* Create domain user */
 275         if ((acct_name = talloc_asprintf(mem_ctx, "%s$", global_myname())) == NULL) {
 276                 result = NT_STATUS_NO_MEMORY;
 277                 goto done;
 278         }
 279         strlower_m(acct_name);
 280
 281         init_lsa_String(&lsa_acct_name, acct_name);
 282
 283         acct_flags = SEC_GENERIC_READ | SEC_GENERIC_WRITE | SEC_GENERIC_EXECUTE |
 284                      SEC_STD_WRITE_DAC | SEC_STD_DELETE |
 285                      SAMR_USER_ACCESS_SET_PASSWORD |
 286                      SAMR_USER_ACCESS_GET_ATTRIBUTES |
 287                      SAMR_USER_ACCESS_SET_ATTRIBUTES;
 288
 289         DEBUG(10, ("Creating account with flags: %d\n",acct_flags));
 290
 291         result = rpccli_samr_CreateUser2(pipe_hnd, mem_ctx,
 292                                          &domain_pol,
 293                                          &lsa_acct_name,
 294                                          acb_info,
 295                                          acct_flags,
 296                                          &user_pol,
 297                                          &access_granted,
 298                                          &user_rid);
 299
 300         if (!NT_STATUS_IS_OK(result) &&
 301             !NT_STATUS_EQUAL(result, NT_STATUS_USER_EXISTS)) {
 302                 d_fprintf(stderr,_("Creation of workstation account failed\n"));
 303
 304                 /* If NT_STATUS_ACCESS_DENIED then we have a valid
 305                    username/password combo but the user does not have
 306                    administrator access. */
 307
 308                 if (NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED))
 309                         d_fprintf(stderr, _("User specified does not have "
 310                                             "administrator privileges\n"));
 311
 312                 goto done;
 313         }
 314
 315         /* We *must* do this.... don't ask... */
 316
 317         if (NT_STATUS_IS_OK(result)) {
 318                 rpccli_samr_Close(pipe_hnd, mem_ctx, &user_pol);
 319         }
 320
 321         CHECK_RPC_ERR_DEBUG(rpccli_samr_LookupNames(pipe_hnd, mem_ctx,
 322                                                     &domain_pol,
 323                                                     1,
 324                                                     &lsa_acct_name,
 325                                                     &user_rids,
 326                                                     &name_types),
 327                             ("error looking up rid for user %s: %s\n",
 328                              acct_name, nt_errstr(result)));
 329
 330         if (name_types.ids[0] != SID_NAME_USER) {
 331                 DEBUG(0, ("%s is not a user account (type=%d)\n", acct_name, name_types.ids[0]));
 332                 goto done;
 333         }
 334
 335         user_rid = user_rids.ids[0];
 336
 337         /* Open handle on user */
 338
 339         CHECK_RPC_ERR_DEBUG(
 340                 rpccli_samr_OpenUser(pipe_hnd, mem_ctx,
 341                                      &domain_pol,
 342                                      SEC_FLAG_MAXIMUM_ALLOWED,
 343                                      user_rid,
 344                                      &user_pol),
 345                 ("could not re-open existing user %s: %s\n",
 346                  acct_name, nt_errstr(result)));
 347
 348         /* Create a random machine account password */
 349
 350         clear_trust_password = generate_random_str(talloc_tos(), DEFAULT_TRUST_ACCOUNT_PASSWORD_LENGTH);
 351         E_md4hash(clear_trust_password, md4_trust_password);
 352
 353         /* Set password on machine account */
 354
 355         init_samr_CryptPassword(clear_trust_password,
 356                                 &cli->user_session_key,
 357                                 &crypt_pwd);
 358
 359         set_info.info24.password = crypt_pwd;
 360         set_info.info24.password_expired = PASS_DONT_CHANGE_AT_NEXT_LOGON;
 361
 362         CHECK_RPC_ERR(rpccli_samr_SetUserInfo2(pipe_hnd, mem_ctx,
 363                                                &user_pol,
 364                                                24,
 365                                                &set_info),
 366                       "error setting trust account password");
 367
 368         /* Why do we have to try to (re-)set the ACB to be the same as what
 369            we passed in the samr_create_dom_user() call?  When a NT
 370            workstation is joined to a domain by an administrator the
 371            acb_info is set to 0x80.  For a normal user with "Add
 372            workstations to the domain" rights the acb_info is 0x84.  I'm
 373            not sure whether it is supposed to make a difference or not.  NT
 374            seems to cope with either value so don't bomb out if the set
 375            userinfo2 level 0x10 fails.  -tpot */
 376
 377         set_info.info16.acct_flags = acb_info;
 378
 379         /* Ignoring the return value is necessary for joining a domain
 380            as a normal user with "Add workstation to domain" privilege. */
 381
 382         result = rpccli_samr_SetUserInfo(pipe_hnd, mem_ctx,
 383                                          &user_pol,
 384                                          16,
 385                                          &set_info);
 386
 387         rpccli_samr_Close(pipe_hnd, mem_ctx, &user_pol);
 388         TALLOC_FREE(pipe_hnd); /* Done with this pipe */
 389
 390         /* Now check the whole process from top-to-bottom */
 391
 392         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_netlogon.syntax_id,
 393                                           &pipe_hnd);
 394         if (!NT_STATUS_IS_OK(result)) {
 395                 DEBUG(0,("Error connecting to NETLOGON pipe. Error was %s\n",
 396                         nt_errstr(result) ));
 397                 goto done;
 398         }
 399
 400         result = rpccli_netlogon_setup_creds(pipe_hnd,
 401                                         cli->desthost, /* server name */
 402                                         domain,        /* domain */
 403                                         global_myname(), /* client name */
 404                                         global_myname(), /* machine account name */
 405                                         md4_trust_password,
 406                                         sec_channel_type,
 407                                         &neg_flags);
 408
 409         if (!NT_STATUS_IS_OK(result)) {
 410                 DEBUG(0, ("Error in domain join verification (credential setup failed): %s\n\n",
 411                           nt_errstr(result)));
 412
 413                 if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
 414                      (sec_channel_type == SEC_CHAN_BDC) ) {
 415                         d_fprintf(stderr, _("Please make sure that no computer "
 416                                             "account\nnamed like this machine "
 417                                             "(%s) exists in the domain\n"),
 418                                  global_myname());
 419                 }
 420
 421                 goto done;
 422         }
 423
 424         /* We can only check the schannel connection if the client is allowed
 425            to do this and the server supports it. If not, just assume success
 426            (after all the rpccli_netlogon_setup_creds() succeeded, and we'll
 427            do the same again (setup creds) in net_rpc_join_ok(). JRA. */
 428
 429         if (lp_client_schannel() && (neg_flags & NETLOGON_NEG_SCHANNEL)) {
 430                 struct rpc_pipe_client *netlogon_schannel_pipe;
 431
 432                 result = cli_rpc_pipe_open_schannel_with_key(
 433                         cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
 434                         DCERPC_AUTH_LEVEL_PRIVACY, domain, &pipe_hnd->dc,
 435                         &netlogon_schannel_pipe);
 436
 437                 if (!NT_STATUS_IS_OK(result)) {
 438                         DEBUG(0, ("Error in domain join verification (schannel setup failed): %s\n\n",
 439                                   nt_errstr(result)));
 440
 441                         if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
 442                              (sec_channel_type == SEC_CHAN_BDC) ) {
 443                                 d_fprintf(stderr, _("Please make sure that no "
 444                                                     "computer account\nnamed "
 445                                                     "like this machine (%s) "
 446                                                     "exists in the domain\n"),
 447                                          global_myname());
 448                         }
 449
 450                         goto done;
 451                 }
 452                 TALLOC_FREE(netlogon_schannel_pipe);
 453         }
 454
 455         TALLOC_FREE(pipe_hnd);
 456
 457         /* Now store the secret in the secrets database */
 458
 459         strupper_m(CONST_DISCARD(char *, domain));
 460
 461         if (!secrets_store_domain_sid(domain, domain_sid)) {
 462                 DEBUG(0, ("error storing domain sid for %s\n", domain));
 463                 goto done;
 464         }
 465
 466         if (!secrets_store_machine_password(clear_trust_password, domain, sec_channel_type)) {
 467                 DEBUG(0, ("error storing plaintext domain secrets for %s\n", domain));
 468         }
 469
 470         /* double-check, connection from scratch */
 471         result = net_rpc_join_ok(c, domain, cli->desthost, &cli->dest_ss);
 472         retval = NT_STATUS_IS_OK(result) ? 0 : -1;
 473
 474 done:
 475
 476         /* Display success or failure */
 477
 478         if (domain) {
 479                 if (retval != 0) {
 480                         fprintf(stderr,_("Unable to join domain %s.\n"),domain);
 481                 } else {
 482                         printf(_("Joined domain %s.\n"),domain);
 483                 }
 484         }
 485
 486         cli_shutdown(cli);
 487
 488         TALLOC_FREE(clear_trust_password);
 489
 490         return retval;
 491 }
 492
 493 /**
 494  * check that a join is OK
 495  *
 496  * @return A shell status integer (0 for success)
 497  *
 498  **/
 499 int net_rpc_testjoin(struct net_context *c, int argc, const char **argv)
 500 {
 501         NTSTATUS nt_status;
 502
 503         if (c->display_usage) {
 504                 d_printf(_("Usage\n"
 505                            "net rpc testjoin\n"
 506                            "    Test if a join is OK\n"));
 507                 return 0;
 508         }
 509
 510         /* Display success or failure */
 511         nt_status = net_rpc_join_ok(c, c->opt_target_workgroup, NULL, NULL);
 512         if (!NT_STATUS_IS_OK(nt_status)) {
 513                 fprintf(stderr, _("Join to domain '%s' is not valid: %s\n"),
 514                         c->opt_target_workgroup, nt_errstr(nt_status));
 515                 return -1;
 516         }
 517
 518         printf(_("Join to '%s' is OK\n"), c->opt_target_workgroup);
 519         return 0;
 520 }