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 #include "rpc_client/init_lsa.h"
  32
  33 /* Macro for checking RPC error codes to make things more readable */
  34
  35 #define CHECK_RPC_ERR(rpc, msg) \
  36         if (!NT_STATUS_IS_OK(result = rpc)) { \
  37                 DEBUG(0, (msg ": %s\n", nt_errstr(result))); \
  38                 goto done; \
  39         }
  40
  41 #define CHECK_RPC_ERR_DEBUG(rpc, debug_args) \
  42         if (!NT_STATUS_IS_OK(result = rpc)) { \
  43                 DEBUG(0, debug_args); \
  44                 goto done; \
  45         }
  46
  47 /**
  48  * confirm that a domain join is still valid
  49  *
  50  * @return A shell status integer (0 for success)
  51  *
  52  **/
  53 NTSTATUS net_rpc_join_ok(struct net_context *c, const char *domain,
  54                          const char *server, struct sockaddr_storage *pss)
  55 {
  56         enum security_types sec;
  57         unsigned int conn_flags = NET_FLAGS_PDC;
  58         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
  59         struct cli_state *cli = NULL;
  60         struct rpc_pipe_client *pipe_hnd = NULL;
  61         struct rpc_pipe_client *netlogon_pipe = NULL;
  62         NTSTATUS ntret = NT_STATUS_UNSUCCESSFUL;
  63
  64         sec = (enum security_types)lp_security();
  65
  66         if (sec == SEC_ADS) {
  67                 /* Connect to IPC$ using machine account's credentials. We don't use anonymous
  68                    connection here, as it may be denied by server's local policy. */
  69                 net_use_machine_account(c);
  70
  71         } else {
  72                 /* some servers (e.g. WinNT) don't accept machine-authenticated
  73                    smb connections */
  74                 conn_flags |= NET_FLAGS_ANONYMOUS;
  75         }
  76
  77         /* Connect to remote machine */
  78         ntret = net_make_ipc_connection_ex(c, domain, server, pss, conn_flags,
  79                                            &cli);
  80         if (!NT_STATUS_IS_OK(ntret)) {
  81                 return ntret;
  82         }
  83
  84         /* Setup the creds as though we're going to do schannel... */
  85         ntret = get_schannel_session_key(cli, domain, &neg_flags,
  86                                          &netlogon_pipe);
  87
  88         /* We return NT_STATUS_INVALID_NETWORK_RESPONSE if the server is refusing
  89            to negotiate schannel, but the creds were set up ok. That'll have to do. */
  90
  91         if (!NT_STATUS_IS_OK(ntret)) {
  92                 if (NT_STATUS_EQUAL(ntret, NT_STATUS_INVALID_NETWORK_RESPONSE)) {
  93                         cli_shutdown(cli);
  94                         return NT_STATUS_OK;
  95                 } else {
  96                         DEBUG(0,("net_rpc_join_ok: failed to get schannel session "
  97                                         "key from server %s for domain %s. Error was %s\n",
  98                                 cli->desthost, domain, nt_errstr(ntret) ));
  99                         cli_shutdown(cli);
 100                         return ntret;
 101                 }
 102         }
 103
 104         /* Only do the rest of the schannel test if the client is allowed to do this. */
 105         if (!lp_client_schannel()) {
 106                 cli_shutdown(cli);
 107                 /* We're good... */
 108                 return ntret;
 109         }
 110
 111         ntret = cli_rpc_pipe_open_schannel_with_key(
 112                 cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
 113                 DCERPC_AUTH_LEVEL_PRIVACY,
 114                 domain, &netlogon_pipe->dc, &pipe_hnd);
 115
 116         if (!NT_STATUS_IS_OK(ntret)) {
 117                 DEBUG(0,("net_rpc_join_ok: failed to open schannel session "
 118                                 "on netlogon pipe to server %s for domain %s. Error was %s\n",
 119                         cli->desthost, domain, nt_errstr(ntret) ));
 120                 /*
 121                  * Note: here, we have:
 122                  * (pipe_hnd != NULL) if and only if NT_STATUS_IS_OK(ntret)
 123                  */
 124         }
 125
 126         cli_shutdown(cli);
 127         return ntret;
 128 }
 129
 130 /**
 131  * Join a domain using the administrator username and password
 132  *
 133  * @param argc  Standard main() style argc
 134  * @param argc  Standard main() style argv.  Initial components are already
 135  *              stripped.  Currently not used.
 136  * @return A shell status integer (0 for success)
 137  *
 138  **/
 139
 140 int net_rpc_join_newstyle(struct net_context *c, int argc, const char **argv)
 141 {
 142
 143         /* libsmb variables */
 144
 145         struct cli_state *cli;
 146         TALLOC_CTX *mem_ctx;
 147         uint32 acb_info = ACB_WSTRUST;
 148         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
 149         enum netr_SchannelType sec_channel_type;
 150         struct rpc_pipe_client *pipe_hnd = NULL;
 151
 152         /* rpc variables */
 153
 154         struct policy_handle lsa_pol, sam_pol, domain_pol, user_pol;
 155         struct dom_sid *domain_sid;
 156         uint32 user_rid;
 157
 158         /* Password stuff */
 159
 160         char *clear_trust_password = NULL;
 161         struct samr_CryptPassword crypt_pwd;
 162         uchar md4_trust_password[16];
 163         union samr_UserInfo set_info;
 164
 165         /* Misc */
 166
 167         NTSTATUS result;
 168         int retval = 1;
 169         const char *domain = NULL;
 170         char *acct_name;
 171         struct lsa_String lsa_acct_name;
 172         uint32 acct_flags=0;
 173         uint32_t access_granted = 0;
 174         union lsa_PolicyInformation *info = NULL;
 175         struct samr_Ids user_rids;
 176         struct samr_Ids name_types;
 177
 178         /* check what type of join */
 179         if (argc >= 0) {
 180                 sec_channel_type = get_sec_channel_type(argv[0]);
 181         } else {
 182                 sec_channel_type = get_sec_channel_type(NULL);
 183         }
 184
 185         switch (sec_channel_type) {
 186         case SEC_CHAN_WKSTA:
 187                 acb_info = ACB_WSTRUST;
 188                 break;
 189         case SEC_CHAN_BDC:
 190                 acb_info = ACB_SVRTRUST;
 191                 break;
 192 #if 0
 193         case SEC_CHAN_DOMAIN:
 194                 acb_info = ACB_DOMTRUST;
 195                 break;
 196 #endif
 197         default:
 198                 DEBUG(0,("secure channel type %d not yet supported\n",
 199                         sec_channel_type));
 200                 break;
 201         }
 202
 203         /* Make authenticated connection to remote machine */
 204
 205         result = net_make_ipc_connection(c, NET_FLAGS_PDC, &cli);
 206         if (!NT_STATUS_IS_OK(result)) {
 207                 return 1;
 208         }
 209
 210         if (!(mem_ctx = talloc_init("net_rpc_join_newstyle"))) {
 211                 DEBUG(0, ("Could not initialise talloc context\n"));
 212                 goto done;
 213         }
 214
 215         /* Fetch domain sid */
 216
 217         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_lsarpc.syntax_id,
 218                                           &pipe_hnd);
 219         if (!NT_STATUS_IS_OK(result)) {
 220                 DEBUG(0, ("Error connecting to LSA pipe. Error was %s\n",
 221                         nt_errstr(result) ));
 222                 goto done;
 223         }
 224
 225
 226         CHECK_RPC_ERR(rpccli_lsa_open_policy(pipe_hnd, mem_ctx, true,
 227                                           SEC_FLAG_MAXIMUM_ALLOWED,
 228                                           &lsa_pol),
 229                       "error opening lsa policy handle");
 230
 231         CHECK_RPC_ERR(rpccli_lsa_QueryInfoPolicy(pipe_hnd, mem_ctx,
 232                                                  &lsa_pol,
 233                                                  LSA_POLICY_INFO_ACCOUNT_DOMAIN,
 234                                                  &info),
 235                       "error querying info policy");
 236
 237         domain = info->account_domain.name.string;
 238         domain_sid = info->account_domain.sid;
 239
 240         rpccli_lsa_Close(pipe_hnd, mem_ctx, &lsa_pol);
 241         TALLOC_FREE(pipe_hnd); /* Done with this pipe */
 242
 243         /* Bail out if domain didn't get set. */
 244         if (!domain) {
 245                 DEBUG(0, ("Could not get domain name.\n"));
 246                 goto done;
 247         }
 248
 249         /* Create domain user */
 250         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 251                                           &pipe_hnd);
 252         if (!NT_STATUS_IS_OK(result)) {
 253                 DEBUG(0, ("Error connecting to SAM pipe. Error was %s\n",
 254                         nt_errstr(result) ));
 255                 goto done;
 256         }
 257
 258         CHECK_RPC_ERR(rpccli_samr_Connect2(pipe_hnd, mem_ctx,
 259                                            pipe_hnd->desthost,
 260                                            SAMR_ACCESS_ENUM_DOMAINS
 261                                            | SAMR_ACCESS_LOOKUP_DOMAIN,
 262                                            &sam_pol),
 263                       "could not connect to SAM database");
 264
 265
 266         CHECK_RPC_ERR(rpccli_samr_OpenDomain(pipe_hnd, mem_ctx,
 267                                              &sam_pol,
 268                                              SAMR_DOMAIN_ACCESS_LOOKUP_INFO_1
 269                                              | SAMR_DOMAIN_ACCESS_CREATE_USER
 270                                              | SAMR_DOMAIN_ACCESS_OPEN_ACCOUNT,
 271                                              domain_sid,
 272                                              &domain_pol),
 273                       "could not open domain");
 274
 275         /* Create domain user */
 276         if ((acct_name = talloc_asprintf(mem_ctx, "%s$", global_myname())) == NULL) {
 277                 result = NT_STATUS_NO_MEMORY;
 278                 goto done;
 279         }
 280         strlower_m(acct_name);
 281
 282         init_lsa_String(&lsa_acct_name, acct_name);
 283
 284         acct_flags = SEC_GENERIC_READ | SEC_GENERIC_WRITE | SEC_GENERIC_EXECUTE |
 285                      SEC_STD_WRITE_DAC | SEC_STD_DELETE |
 286                      SAMR_USER_ACCESS_SET_PASSWORD |
 287                      SAMR_USER_ACCESS_GET_ATTRIBUTES |
 288                      SAMR_USER_ACCESS_SET_ATTRIBUTES;
 289
 290         DEBUG(10, ("Creating account with flags: %d\n",acct_flags));
 291
 292         result = rpccli_samr_CreateUser2(pipe_hnd, mem_ctx,
 293                                          &domain_pol,
 294                                          &lsa_acct_name,
 295                                          acb_info,
 296                                          acct_flags,
 297                                          &user_pol,
 298                                          &access_granted,
 299                                          &user_rid);
 300
 301         if (!NT_STATUS_IS_OK(result) &&
 302             !NT_STATUS_EQUAL(result, NT_STATUS_USER_EXISTS)) {
 303                 d_fprintf(stderr,_("Creation of workstation account failed\n"));
 304
 305                 /* If NT_STATUS_ACCESS_DENIED then we have a valid
 306                    username/password combo but the user does not have
 307                    administrator access. */
 308
 309                 if (NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED))
 310                         d_fprintf(stderr, _("User specified does not have "
 311                                             "administrator privileges\n"));
 312
 313                 goto done;
 314         }
 315
 316         /* We *must* do this.... don't ask... */
 317
 318         if (NT_STATUS_IS_OK(result)) {
 319                 rpccli_samr_Close(pipe_hnd, mem_ctx, &user_pol);
 320         }
 321
 322         CHECK_RPC_ERR_DEBUG(rpccli_samr_LookupNames(pipe_hnd, mem_ctx,
 323                                                     &domain_pol,
 324                                                     1,
 325                                                     &lsa_acct_name,
 326                                                     &user_rids,
 327                                                     &name_types),
 328                             ("error looking up rid for user %s: %s\n",
 329                              acct_name, nt_errstr(result)));
 330
 331         if (name_types.ids[0] != SID_NAME_USER) {
 332                 DEBUG(0, ("%s is not a user account (type=%d)\n", acct_name, name_types.ids[0]));
 333                 goto done;
 334         }
 335
 336         user_rid = user_rids.ids[0];
 337
 338         /* Open handle on user */
 339
 340         CHECK_RPC_ERR_DEBUG(
 341                 rpccli_samr_OpenUser(pipe_hnd, mem_ctx,
 342                                      &domain_pol,
 343                                      SEC_FLAG_MAXIMUM_ALLOWED,
 344                                      user_rid,
 345                                      &user_pol),
 346                 ("could not re-open existing user %s: %s\n",
 347                  acct_name, nt_errstr(result)));
 348
 349         /* Create a random machine account password */
 350
 351         clear_trust_password = generate_random_str(talloc_tos(), DEFAULT_TRUST_ACCOUNT_PASSWORD_LENGTH);
 352         E_md4hash(clear_trust_password, md4_trust_password);
 353
 354         /* Set password on machine account */
 355
 356         init_samr_CryptPassword(clear_trust_password,
 357                                 &cli->user_session_key,
 358                                 &crypt_pwd);
 359
 360         set_info.info24.password = crypt_pwd;
 361         set_info.info24.password_expired = PASS_DONT_CHANGE_AT_NEXT_LOGON;
 362
 363         CHECK_RPC_ERR(rpccli_samr_SetUserInfo2(pipe_hnd, mem_ctx,
 364                                                &user_pol,
 365                                                24,
 366                                                &set_info),
 367                       "error setting trust account password");
 368
 369         /* Why do we have to try to (re-)set the ACB to be the same as what
 370            we passed in the samr_create_dom_user() call?  When a NT
 371            workstation is joined to a domain by an administrator the
 372            acb_info is set to 0x80.  For a normal user with "Add
 373            workstations to the domain" rights the acb_info is 0x84.  I'm
 374            not sure whether it is supposed to make a difference or not.  NT
 375            seems to cope with either value so don't bomb out if the set
 376            userinfo2 level 0x10 fails.  -tpot */
 377
 378         set_info.info16.acct_flags = acb_info;
 379
 380         /* Ignoring the return value is necessary for joining a domain
 381            as a normal user with "Add workstation to domain" privilege. */
 382
 383         result = rpccli_samr_SetUserInfo(pipe_hnd, mem_ctx,
 384                                          &user_pol,
 385                                          16,
 386                                          &set_info);
 387
 388         rpccli_samr_Close(pipe_hnd, mem_ctx, &user_pol);
 389         TALLOC_FREE(pipe_hnd); /* Done with this pipe */
 390
 391         /* Now check the whole process from top-to-bottom */
 392
 393         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_netlogon.syntax_id,
 394                                           &pipe_hnd);
 395         if (!NT_STATUS_IS_OK(result)) {
 396                 DEBUG(0,("Error connecting to NETLOGON pipe. Error was %s\n",
 397                         nt_errstr(result) ));
 398                 goto done;
 399         }
 400
 401         result = rpccli_netlogon_setup_creds(pipe_hnd,
 402                                         cli->desthost, /* server name */
 403                                         domain,        /* domain */
 404                                         global_myname(), /* client name */
 405                                         global_myname(), /* machine account name */
 406                                         md4_trust_password,
 407                                         sec_channel_type,
 408                                         &neg_flags);
 409
 410         if (!NT_STATUS_IS_OK(result)) {
 411                 DEBUG(0, ("Error in domain join verification (credential setup failed): %s\n\n",
 412                           nt_errstr(result)));
 413
 414                 if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
 415                      (sec_channel_type == SEC_CHAN_BDC) ) {
 416                         d_fprintf(stderr, _("Please make sure that no computer "
 417                                             "account\nnamed like this machine "
 418                                             "(%s) exists in the domain\n"),
 419                                  global_myname());
 420                 }
 421
 422                 goto done;
 423         }
 424
 425         /* We can only check the schannel connection if the client is allowed
 426            to do this and the server supports it. If not, just assume success
 427            (after all the rpccli_netlogon_setup_creds() succeeded, and we'll
 428            do the same again (setup creds) in net_rpc_join_ok(). JRA. */
 429
 430         if (lp_client_schannel() && (neg_flags & NETLOGON_NEG_SCHANNEL)) {
 431                 struct rpc_pipe_client *netlogon_schannel_pipe;
 432
 433                 result = cli_rpc_pipe_open_schannel_with_key(
 434                         cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
 435                         DCERPC_AUTH_LEVEL_PRIVACY, domain, &pipe_hnd->dc,
 436                         &netlogon_schannel_pipe);
 437
 438                 if (!NT_STATUS_IS_OK(result)) {
 439                         DEBUG(0, ("Error in domain join verification (schannel setup failed): %s\n\n",
 440                                   nt_errstr(result)));
 441
 442                         if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
 443                              (sec_channel_type == SEC_CHAN_BDC) ) {
 444                                 d_fprintf(stderr, _("Please make sure that no "
 445                                                     "computer account\nnamed "
 446                                                     "like this machine (%s) "
 447                                                     "exists in the domain\n"),
 448                                          global_myname());
 449                         }
 450
 451                         goto done;
 452                 }
 453                 TALLOC_FREE(netlogon_schannel_pipe);
 454         }
 455
 456         TALLOC_FREE(pipe_hnd);
 457
 458         /* Now store the secret in the secrets database */
 459
 460         strupper_m(CONST_DISCARD(char *, domain));
 461
 462         if (!secrets_store_domain_sid(domain, domain_sid)) {
 463                 DEBUG(0, ("error storing domain sid for %s\n", domain));
 464                 goto done;
 465         }
 466
 467         if (!secrets_store_machine_password(clear_trust_password, domain, sec_channel_type)) {
 468                 DEBUG(0, ("error storing plaintext domain secrets for %s\n", domain));
 469         }
 470
 471         /* double-check, connection from scratch */
 472         result = net_rpc_join_ok(c, domain, cli->desthost, &cli->dest_ss);
 473         retval = NT_STATUS_IS_OK(result) ? 0 : -1;
 474
 475 done:
 476
 477         /* Display success or failure */
 478
 479         if (domain) {
 480                 if (retval != 0) {
 481                         fprintf(stderr,_("Unable to join domain %s.\n"),domain);
 482                 } else {
 483                         printf(_("Joined domain %s.\n"),domain);
 484                 }
 485         }
 486
 487         cli_shutdown(cli);
 488
 489         TALLOC_FREE(clear_trust_password);
 490
 491         return retval;
 492 }
 493
 494 /**
 495  * check that a join is OK
 496  *
 497  * @return A shell status integer (0 for success)
 498  *
 499  **/
 500 int net_rpc_testjoin(struct net_context *c, int argc, const char **argv)
 501 {
 502         NTSTATUS nt_status;
 503
 504         if (c->display_usage) {
 505                 d_printf(_("Usage\n"
 506                            "net rpc testjoin\n"
 507                            "    Test if a join is OK\n"));
 508                 return 0;
 509         }
 510
 511         /* Display success or failure */
 512         nt_status = net_rpc_join_ok(c, c->opt_target_workgroup, NULL, NULL);
 513         if (!NT_STATUS_IS_OK(nt_status)) {
 514                 fprintf(stderr, _("Join to domain '%s' is not valid: %s\n"),
 515                         c->opt_target_workgroup, nt_errstr(nt_status));
 516                 return -1;
 517         }
 518
 519         printf(_("Join to '%s' is OK\n"), c->opt_target_workgroup);
 520         return 0;
 521 }