source/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
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "includes.h"
  21 #include "utils/net.h"
  22
  23 /* Macro for checking RPC error codes to make things more readable */
  24
  25 #define CHECK_RPC_ERR(rpc, msg) \
  26         if (!NT_STATUS_IS_OK(result = rpc)) { \
  27                 DEBUG(0, (msg ": %s\n", nt_errstr(result))); \
  28                 goto done; \
  29         }
  30
  31 #define CHECK_RPC_ERR_DEBUG(rpc, debug_args) \
  32         if (!NT_STATUS_IS_OK(result = rpc)) { \
  33                 DEBUG(0, debug_args); \
  34                 goto done; \
  35         }
  36
  37 /**
  38  * confirm that a domain join is still valid
  39  *
  40  * @return A shell status integer (0 for success)
  41  *
  42  **/
  43 NTSTATUS net_rpc_join_ok(const char *domain, const char *server,
  44                          struct sockaddr_storage *pss)
  45 {
  46         enum security_types sec;
  47         unsigned int conn_flags = NET_FLAGS_PDC;
  48         uint32 neg_flags = NETLOGON_NEG_AUTH2_FLAGS|NETLOGON_NEG_SCHANNEL;
  49         struct cli_state *cli = NULL;
  50         struct rpc_pipe_client *pipe_hnd = NULL;
  51         struct rpc_pipe_client *netlogon_pipe = NULL;
  52         NTSTATUS ntret = NT_STATUS_UNSUCCESSFUL;
  53
  54         sec = (enum security_types)lp_security();
  55
  56         if (sec == SEC_ADS) {
  57                 /* Connect to IPC$ using machine account's credentials. We don't use anonymous
  58                    connection here, as it may be denied by server's local policy. */
  59                 net_use_machine_account();
  60
  61         } else {
  62                 /* some servers (e.g. WinNT) don't accept machine-authenticated
  63                    smb connections */
  64                 conn_flags |= NET_FLAGS_ANONYMOUS;
  65         }
  66
  67         /* Connect to remote machine */
  68         ntret = net_make_ipc_connection_ex(domain, server, pss, conn_flags, &cli);
  69         if (!NT_STATUS_IS_OK(ntret)) {
  70                 return ntret;
  71         }
  72
  73         /* Setup the creds as though we're going to do schannel... */
  74         netlogon_pipe = get_schannel_session_key(cli, domain, &neg_flags, &ntret);
  75
  76         /* We return NT_STATUS_INVALID_NETWORK_RESPONSE if the server is refusing
  77            to negotiate schannel, but the creds were set up ok. That'll have to do. */
  78
  79         if (!netlogon_pipe) {
  80                 if (NT_STATUS_EQUAL(ntret, NT_STATUS_INVALID_NETWORK_RESPONSE)) {
  81                         cli_shutdown(cli);
  82                         return NT_STATUS_OK;
  83                 } else {
  84                         DEBUG(0,("net_rpc_join_ok: failed to get schannel session "
  85                                         "key from server %s for domain %s. Error was %s\n",
  86                                 cli->desthost, domain, nt_errstr(ntret) ));
  87                         cli_shutdown(cli);
  88                         return ntret;
  89                 }
  90         }
  91
  92         /* Only do the rest of the schannel test if the client is allowed to do this. */
  93         if (!lp_client_schannel()) {
  94                 cli_shutdown(cli);
  95                 /* We're good... */
  96                 return ntret;
  97         }
  98
  99         pipe_hnd = cli_rpc_pipe_open_schannel_with_key(cli, PI_NETLOGON,
 100                                 PIPE_AUTH_LEVEL_PRIVACY,
 101                                 domain, netlogon_pipe->dc, &ntret);
 102
 103         if (!pipe_hnd) {
 104                 DEBUG(0,("net_rpc_join_ok: failed to open schannel session "
 105                                 "on netlogon pipe to server %s for domain %s. Error was %s\n",
 106                         cli->desthost, domain, nt_errstr(ntret) ));
 107                 /*
 108                  * Note: here, we have:
 109                  * (pipe_hnd != NULL) if and only if NT_STATUS_IS_OK(ntret)
 110                  */
 111         }
 112
 113         cli_shutdown(cli);
 114         return ntret;
 115 }
 116
 117 /**
 118  * Join a domain using the administrator username and password
 119  *
 120  * @param argc  Standard main() style argc
 121  * @param argc  Standard main() style argv.  Initial components are already
 122  *              stripped.  Currently not used.
 123  * @return A shell status integer (0 for success)
 124  *
 125  **/
 126
 127 int net_rpc_join_newstyle(int argc, const char **argv)
 128 {
 129
 130         /* libsmb variables */
 131
 132         struct cli_state *cli;
 133         TALLOC_CTX *mem_ctx;
 134         uint32 acb_info = ACB_WSTRUST;
 135         uint32 neg_flags = NETLOGON_NEG_AUTH2_FLAGS|(lp_client_schannel() ? NETLOGON_NEG_SCHANNEL : 0);
 136         uint32 sec_channel_type;
 137         struct rpc_pipe_client *pipe_hnd = NULL;
 138
 139         /* rpc variables */
 140
 141         POLICY_HND lsa_pol, sam_pol, domain_pol, user_pol;
 142         DOM_SID *domain_sid;
 143         uint32 user_rid;
 144
 145         /* Password stuff */
 146
 147         char *clear_trust_password = NULL;
 148         uchar pwbuf[516];
 149         SAM_USERINFO_CTR ctr;
 150         SAM_USER_INFO_24 p24;
 151         SAM_USER_INFO_16 p16;
 152         uchar md4_trust_password[16];
 153
 154         /* Misc */
 155
 156         NTSTATUS result;
 157         int retval = 1;
 158         const char *domain = NULL;
 159         uint32 num_rids, *name_types, *user_rids;
 160         uint32 flags = 0x3e8;
 161         char *acct_name;
 162         const char *const_acct_name;
 163
 164         /* check what type of join */
 165         if (argc >= 0) {
 166                 sec_channel_type = get_sec_channel_type(argv[0]);
 167         } else {
 168                 sec_channel_type = get_sec_channel_type(NULL);
 169         }
 170
 171         switch (sec_channel_type) {
 172         case SEC_CHAN_WKSTA:
 173                 acb_info = ACB_WSTRUST;
 174                 break;
 175         case SEC_CHAN_BDC:
 176                 acb_info = ACB_SVRTRUST;
 177                 break;
 178 #if 0
 179         case SEC_CHAN_DOMAIN:
 180                 acb_info = ACB_DOMTRUST;
 181                 break;
 182 #endif
 183         }
 184
 185         /* Make authenticated connection to remote machine */
 186
 187         result = net_make_ipc_connection(NET_FLAGS_PDC, &cli);
 188         if (!NT_STATUS_IS_OK(result)) {
 189                 return 1;
 190         }
 191
 192         if (!(mem_ctx = talloc_init("net_rpc_join_newstyle"))) {
 193                 DEBUG(0, ("Could not initialise talloc context\n"));
 194                 goto done;
 195         }
 196
 197         /* Fetch domain sid */
 198
 199         pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_LSARPC, &result);
 200         if (!pipe_hnd) {
 201                 DEBUG(0, ("Error connecting to LSA pipe. Error was %s\n",
 202                         nt_errstr(result) ));
 203                 goto done;
 204         }
 205
 206
 207         CHECK_RPC_ERR(rpccli_lsa_open_policy(pipe_hnd, mem_ctx, True,
 208                                           SEC_RIGHTS_MAXIMUM_ALLOWED,
 209                                           &lsa_pol),
 210                       "error opening lsa policy handle");
 211
 212         CHECK_RPC_ERR(rpccli_lsa_query_info_policy(pipe_hnd, mem_ctx, &lsa_pol,
 213                                                 5, &domain, &domain_sid),
 214                       "error querying info policy");
 215
 216         rpccli_lsa_Close(pipe_hnd, mem_ctx, &lsa_pol);
 217         cli_rpc_pipe_close(pipe_hnd); /* Done with this pipe */
 218
 219         /* Bail out if domain didn't get set. */
 220         if (!domain) {
 221                 DEBUG(0, ("Could not get domain name.\n"));
 222                 goto done;
 223         }
 224
 225         /* Create domain user */
 226         pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
 227         if (!pipe_hnd) {
 228                 DEBUG(0, ("Error connecting to SAM pipe. Error was %s\n",
 229                         nt_errstr(result) ));
 230                 goto done;
 231         }
 232
 233         CHECK_RPC_ERR(rpccli_samr_connect(pipe_hnd, mem_ctx,
 234                                        SEC_RIGHTS_MAXIMUM_ALLOWED,
 235                                        &sam_pol),
 236                       "could not connect to SAM database");
 237
 238
 239         CHECK_RPC_ERR(rpccli_samr_open_domain(pipe_hnd, mem_ctx, &sam_pol,
 240                                            SEC_RIGHTS_MAXIMUM_ALLOWED,
 241                                            domain_sid, &domain_pol),
 242                       "could not open domain");
 243
 244         /* Create domain user */
 245         if ((acct_name = talloc_asprintf(mem_ctx, "%s$", global_myname())) == NULL) {
 246                 result = NT_STATUS_NO_MEMORY;
 247                 goto done;
 248         }
 249         strlower_m(acct_name);
 250         const_acct_name = acct_name;
 251
 252         result = rpccli_samr_create_dom_user(pipe_hnd, mem_ctx, &domain_pol,
 253                                           acct_name, acb_info,
 254                                           0xe005000b, &user_pol,
 255                                           &user_rid);
 256
 257         if (!NT_STATUS_IS_OK(result) &&
 258             !NT_STATUS_EQUAL(result, NT_STATUS_USER_EXISTS)) {
 259                 d_fprintf(stderr, "Creation of workstation account failed\n");
 260
 261                 /* If NT_STATUS_ACCESS_DENIED then we have a valid
 262                    username/password combo but the user does not have
 263                    administrator access. */
 264
 265                 if (NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED))
 266                         d_fprintf(stderr, "User specified does not have administrator privileges\n");
 267
 268                 goto done;
 269         }
 270
 271         /* We *must* do this.... don't ask... */
 272
 273         if (NT_STATUS_IS_OK(result)) {
 274                 rpccli_samr_close(pipe_hnd, mem_ctx, &user_pol);
 275         }
 276
 277         CHECK_RPC_ERR_DEBUG(rpccli_samr_lookup_names(pipe_hnd, mem_ctx,
 278                                                   &domain_pol, flags,
 279                                                   1, &const_acct_name,
 280                                                   &num_rids,
 281                                                   &user_rids, &name_types),
 282                             ("error looking up rid for user %s: %s\n",
 283                              acct_name, nt_errstr(result)));
 284
 285         if (name_types[0] != SID_NAME_USER) {
 286                 DEBUG(0, ("%s is not a user account (type=%d)\n", acct_name, name_types[0]));
 287                 goto done;
 288         }
 289
 290         user_rid = user_rids[0];
 291
 292         /* Open handle on user */
 293
 294         CHECK_RPC_ERR_DEBUG(
 295                 rpccli_samr_open_user(pipe_hnd, mem_ctx, &domain_pol,
 296                                    SEC_RIGHTS_MAXIMUM_ALLOWED,
 297                                    user_rid, &user_pol),
 298                 ("could not re-open existing user %s: %s\n",
 299                  acct_name, nt_errstr(result)));
 300
 301         /* Create a random machine account password */
 302
 303         {
 304                 char *str;
 305                 str = generate_random_str(DEFAULT_TRUST_ACCOUNT_PASSWORD_LENGTH);
 306                 clear_trust_password = SMB_STRDUP(str);
 307                 E_md4hash(clear_trust_password, md4_trust_password);
 308         }
 309
 310         encode_pw_buffer(pwbuf, clear_trust_password, STR_UNICODE);
 311
 312         /* Set password on machine account */
 313
 314         ZERO_STRUCT(ctr);
 315         ZERO_STRUCT(p24);
 316
 317         init_sam_user_info24(&p24, (char *)pwbuf,24);
 318
 319         ctr.switch_value = 24;
 320         ctr.info.id24 = &p24;
 321
 322         CHECK_RPC_ERR(rpccli_samr_set_userinfo(pipe_hnd, mem_ctx, &user_pol, 24,
 323                                             &cli->user_session_key, &ctr),
 324                       "error setting trust account password");
 325
 326         /* Why do we have to try to (re-)set the ACB to be the same as what
 327            we passed in the samr_create_dom_user() call?  When a NT
 328            workstation is joined to a domain by an administrator the
 329            acb_info is set to 0x80.  For a normal user with "Add
 330            workstations to the domain" rights the acb_info is 0x84.  I'm
 331            not sure whether it is supposed to make a difference or not.  NT
 332            seems to cope with either value so don't bomb out if the set
 333            userinfo2 level 0x10 fails.  -tpot */
 334
 335         ZERO_STRUCT(ctr);
 336         ctr.switch_value = 16;
 337         ctr.info.id16 = &p16;
 338
 339         init_sam_user_info16(&p16, acb_info);
 340
 341         /* Ignoring the return value is necessary for joining a domain
 342            as a normal user with "Add workstation to domain" privilege. */
 343
 344         result = rpccli_samr_set_userinfo2(pipe_hnd, mem_ctx, &user_pol, 16,
 345                                         &cli->user_session_key, &ctr);
 346
 347         rpccli_samr_close(pipe_hnd, mem_ctx, &user_pol);
 348         cli_rpc_pipe_close(pipe_hnd); /* Done with this pipe */
 349
 350         /* Now check the whole process from top-to-bottom */
 351
 352         pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_NETLOGON, &result);
 353         if (!pipe_hnd) {
 354                 DEBUG(0,("Error connecting to NETLOGON pipe. Error was %s\n",
 355                         nt_errstr(result) ));
 356                 goto done;
 357         }
 358
 359         result = rpccli_netlogon_setup_creds(pipe_hnd,
 360                                         cli->desthost, /* server name */
 361                                         domain,        /* domain */
 362                                         global_myname(), /* client name */
 363                                         global_myname(), /* machine account name */
 364                                         md4_trust_password,
 365                                         sec_channel_type,
 366                                         &neg_flags);
 367
 368         if (!NT_STATUS_IS_OK(result)) {
 369                 DEBUG(0, ("Error in domain join verification (credential setup failed): %s\n\n",
 370                           nt_errstr(result)));
 371
 372                 if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
 373                      (sec_channel_type == SEC_CHAN_BDC) ) {
 374                         d_fprintf(stderr, "Please make sure that no computer account\n"
 375                                  "named like this machine (%s) exists in the domain\n",
 376                                  global_myname());
 377                 }
 378
 379                 goto done;
 380         }
 381
 382         /* We can only check the schannel connection if the client is allowed
 383            to do this and the server supports it. If not, just assume success
 384            (after all the rpccli_netlogon_setup_creds() succeeded, and we'll
 385            do the same again (setup creds) in net_rpc_join_ok(). JRA. */
 386
 387         if (lp_client_schannel() && (neg_flags & NETLOGON_NEG_SCHANNEL)) {
 388                 struct rpc_pipe_client *netlogon_schannel_pipe =
 389                                                 cli_rpc_pipe_open_schannel_with_key(cli,
 390                                                         PI_NETLOGON,
 391                                                         PIPE_AUTH_LEVEL_PRIVACY,
 392                                                         domain,
 393                                                         pipe_hnd->dc,
 394                                                         &result);
 395
 396                 if (!NT_STATUS_IS_OK(result)) {
 397                         DEBUG(0, ("Error in domain join verification (schannel setup failed): %s\n\n",
 398                                   nt_errstr(result)));
 399
 400                         if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
 401                              (sec_channel_type == SEC_CHAN_BDC) ) {
 402                                 d_fprintf(stderr, "Please make sure that no computer account\n"
 403                                          "named like this machine (%s) exists in the domain\n",
 404                                          global_myname());
 405                         }
 406
 407                         goto done;
 408                 }
 409                 cli_rpc_pipe_close(netlogon_schannel_pipe);
 410         }
 411
 412         cli_rpc_pipe_close(pipe_hnd);
 413
 414         /* Now store the secret in the secrets database */
 415
 416         strupper_m(CONST_DISCARD(char *, domain));
 417
 418         if (!secrets_store_domain_sid(domain, domain_sid)) {
 419                 DEBUG(0, ("error storing domain sid for %s\n", domain));
 420                 goto done;
 421         }
 422
 423         if (!secrets_store_machine_password(clear_trust_password, domain, sec_channel_type)) {
 424                 DEBUG(0, ("error storing plaintext domain secrets for %s\n", domain));
 425         }
 426
 427         /* double-check, connection from scratch */
 428         result = net_rpc_join_ok(domain, cli->desthost, &cli->dest_ss);
 429         retval = NT_STATUS_IS_OK(result) ? 0 : -1;
 430
 431 done:
 432
 433         /* Display success or failure */
 434
 435         if (domain) {
 436                 if (retval != 0) {
 437                         fprintf(stderr,"Unable to join domain %s.\n",domain);
 438                 } else {
 439                         printf("Joined domain %s.\n",domain);
 440                 }
 441         }
 442
 443         cli_shutdown(cli);
 444
 445         SAFE_FREE(clear_trust_password);
 446
 447         return retval;
 448 }
 449
 450 /**
 451  * check that a join is OK
 452  *
 453  * @return A shell status integer (0 for success)
 454  *
 455  **/
 456 int net_rpc_testjoin(int argc, const char **argv)
 457 {
 458         char *domain = smb_xstrdup(opt_target_workgroup);
 459         NTSTATUS nt_status;
 460
 461         /* Display success or failure */
 462         nt_status = net_rpc_join_ok(domain, NULL, NULL);
 463         if (!NT_STATUS_IS_OK(nt_status)) {
 464                 fprintf(stderr,"Join to domain '%s' is not valid: %s\n",
 465                         nt_errstr(nt_status), domain);
 466                 free(domain);
 467                 return -1;
 468         }
 469
 470         printf("Join to '%s' is OK\n",domain);
 471         free(domain);
 472         return 0;
 473 }