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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #include "includes.h"
  22 #include "utils/net.h"
  23
  24 /* Macro for checking RPC error codes to make things more readable */
  25
  26 #define CHECK_RPC_ERR(rpc, msg) \
  27         if (!NT_STATUS_IS_OK(result = rpc)) { \
  28                 DEBUG(0, (msg ": %s\n", nt_errstr(result))); \
  29                 goto done; \
  30         }
  31
  32 #define CHECK_RPC_ERR_DEBUG(rpc, debug_args) \
  33         if (!NT_STATUS_IS_OK(result = rpc)) { \
  34                 DEBUG(0, debug_args); \
  35                 goto done; \
  36         }
  37
  38 /**
  39  * confirm that a domain join is still valid
  40  *
  41  * @return A shell status integer (0 for success)
  42  *
  43  **/
  44 int net_rpc_join_ok(const char *domain, const char *server, struct in_addr *ip )
  45 {
  46         uint32 neg_flags = NETLOGON_NEG_AUTH2_FLAGS|NETLOGON_NEG_SCHANNEL;
  47         struct cli_state *cli = NULL;
  48         struct rpc_pipe_client *pipe_hnd = NULL;
  49         struct rpc_pipe_client *netlogon_pipe = NULL;
  50         NTSTATUS ntret = NT_STATUS_UNSUCCESSFUL;
  51
  52         /* Connect to remote machine */
  53         if (!(cli = net_make_ipc_connection_ex(domain, server, ip, (NET_FLAGS_ANONYMOUS|NET_FLAGS_PDC)))) {
  54                 return -1;
  55         }
  56
  57         /* Setup the creds as though we're going to do schannel... */
  58         netlogon_pipe = get_schannel_session_key(cli, domain, &neg_flags, &ntret);
  59
  60         /* We return NT_STATUS_INVALID_NETWORK_RESPONSE if the server is refusing
  61            to negotiate schannel, but the creds were set up ok. That'll have to do. */
  62
  63         if (!netlogon_pipe) {
  64                 if (NT_STATUS_EQUAL(ntret, NT_STATUS_INVALID_NETWORK_RESPONSE)) {
  65                         cli_shutdown(cli);
  66                         return 0;
  67                 } else {
  68                         DEBUG(0,("net_rpc_join_ok: failed to get schannel session "
  69                                         "key from server %s for domain %s. Error was %s\n",
  70                                 cli->desthost, domain, nt_errstr(ntret) ));
  71                         cli_shutdown(cli);
  72                         return -1;
  73                 }
  74         }
  75
  76         /* Only do the rest of the schannel test if the client is allowed to do this. */
  77         if (!lp_client_schannel()) {
  78                 cli_shutdown(cli);
  79                 /* We're good... */
  80                 return 0;
  81         }
  82
  83         pipe_hnd = cli_rpc_pipe_open_schannel_with_key(cli, PI_NETLOGON,
  84                                 PIPE_AUTH_LEVEL_PRIVACY,
  85                                 domain, netlogon_pipe->dc, &ntret);
  86
  87         if (!pipe_hnd) {
  88                 DEBUG(0,("net_rpc_join_ok: failed to open schannel session "
  89                                 "on netlogon pipe to server %s for domain %s. Error was %s\n",
  90                         cli->desthost, domain, nt_errstr(ntret) ));
  91                 cli_shutdown(cli);
  92                 return -1;
  93         }
  94
  95         cli_shutdown(cli);
  96         return 0;
  97 }
  98
  99 /**
 100  * Join a domain using the administrator username and password
 101  *
 102  * @param argc  Standard main() style argc
 103  * @param argc  Standard main() style argv.  Initial components are already
 104  *              stripped.  Currently not used.
 105  * @return A shell status integer (0 for success)
 106  *
 107  **/
 108
 109 int net_rpc_join_newstyle(int argc, const char **argv)
 110 {
 111
 112         /* libsmb variables */
 113
 114         struct cli_state *cli;
 115         TALLOC_CTX *mem_ctx;
 116         uint32 acb_info = ACB_WSTRUST;
 117         uint32 neg_flags = NETLOGON_NEG_AUTH2_FLAGS|(lp_client_schannel() ? NETLOGON_NEG_SCHANNEL : 0);
 118         uint32 sec_channel_type;
 119         struct rpc_pipe_client *pipe_hnd = NULL;
 120
 121         /* rpc variables */
 122
 123         POLICY_HND lsa_pol, sam_pol, domain_pol, user_pol;
 124         DOM_SID *domain_sid;
 125         uint32 user_rid;
 126
 127         /* Password stuff */
 128
 129         char *clear_trust_password = NULL;
 130         uchar pwbuf[516];
 131         SAM_USERINFO_CTR ctr;
 132         SAM_USER_INFO_24 p24;
 133         SAM_USER_INFO_16 p16;
 134         uchar md4_trust_password[16];
 135
 136         /* Misc */
 137
 138         NTSTATUS result;
 139         int retval = 1;
 140         char *domain = NULL;
 141         uint32 num_rids, *name_types, *user_rids;
 142         uint32 flags = 0x3e8;
 143         char *acct_name;
 144         const char *const_acct_name;
 145
 146         /* check what type of join */
 147         if (argc >= 0) {
 148                 sec_channel_type = get_sec_channel_type(argv[0]);
 149         } else {
 150                 sec_channel_type = get_sec_channel_type(NULL);
 151         }
 152
 153         switch (sec_channel_type) {
 154         case SEC_CHAN_WKSTA:
 155                 acb_info = ACB_WSTRUST;
 156                 break;
 157         case SEC_CHAN_BDC:
 158                 acb_info = ACB_SVRTRUST;
 159                 break;
 160 #if 0
 161         case SEC_CHAN_DOMAIN:
 162                 acb_info = ACB_DOMTRUST;
 163                 break;
 164 #endif
 165         }
 166
 167         /* Make authenticated connection to remote machine */
 168
 169         if (!(cli = net_make_ipc_connection(NET_FLAGS_PDC)))
 170                 return 1;
 171
 172         if (!(mem_ctx = talloc_init("net_rpc_join_newstyle"))) {
 173                 DEBUG(0, ("Could not initialise talloc context\n"));
 174                 goto done;
 175         }
 176
 177         /* Fetch domain sid */
 178
 179         pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_LSARPC, &result);
 180         if (!pipe_hnd) {
 181                 DEBUG(0, ("Error connecting to LSA pipe. Error was %s\n",
 182                         nt_errstr(result) ));
 183                 goto done;
 184         }
 185
 186
 187         CHECK_RPC_ERR(rpccli_lsa_open_policy(pipe_hnd, mem_ctx, True,
 188                                           SEC_RIGHTS_MAXIMUM_ALLOWED,
 189                                           &lsa_pol),
 190                       "error opening lsa policy handle");
 191
 192         CHECK_RPC_ERR(rpccli_lsa_query_info_policy(pipe_hnd, mem_ctx, &lsa_pol,
 193                                                 5, &domain, &domain_sid),
 194                       "error querying info policy");
 195
 196         rpccli_lsa_close(pipe_hnd, mem_ctx, &lsa_pol);
 197         cli_rpc_pipe_close(pipe_hnd); /* Done with this pipe */
 198
 199         /* Bail out if domain didn't get set. */
 200         if (!domain) {
 201                 DEBUG(0, ("Could not get domain name.\n"));
 202                 goto done;
 203         }
 204
 205         /* Create domain user */
 206         pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
 207         if (!pipe_hnd) {
 208                 DEBUG(0, ("Error connecting to SAM pipe. Error was %s\n",
 209                         nt_errstr(result) ));
 210                 goto done;
 211         }
 212
 213         CHECK_RPC_ERR(rpccli_samr_connect(pipe_hnd, mem_ctx,
 214                                        SEC_RIGHTS_MAXIMUM_ALLOWED,
 215                                        &sam_pol),
 216                       "could not connect to SAM database");
 217
 218
 219         CHECK_RPC_ERR(rpccli_samr_open_domain(pipe_hnd, mem_ctx, &sam_pol,
 220                                            SEC_RIGHTS_MAXIMUM_ALLOWED,
 221                                            domain_sid, &domain_pol),
 222                       "could not open domain");
 223
 224         /* Create domain user */
 225         if ((acct_name = talloc_asprintf(mem_ctx, "%s$", global_myname())) == NULL) {
 226                 result = NT_STATUS_NO_MEMORY;
 227                 goto done;
 228         }
 229         strlower_m(acct_name);
 230         const_acct_name = acct_name;
 231
 232         result = rpccli_samr_create_dom_user(pipe_hnd, mem_ctx, &domain_pol,
 233                                           acct_name, acb_info,
 234                                           0xe005000b, &user_pol,
 235                                           &user_rid);
 236
 237         if (!NT_STATUS_IS_OK(result) &&
 238             !NT_STATUS_EQUAL(result, NT_STATUS_USER_EXISTS)) {
 239                 d_fprintf(stderr, "Creation of workstation account failed\n");
 240
 241                 /* If NT_STATUS_ACCESS_DENIED then we have a valid
 242                    username/password combo but the user does not have
 243                    administrator access. */
 244
 245                 if (NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED))
 246                         d_fprintf(stderr, "User specified does not have administrator privileges\n");
 247
 248                 goto done;
 249         }
 250
 251         /* We *must* do this.... don't ask... */
 252
 253         if (NT_STATUS_IS_OK(result)) {
 254                 rpccli_samr_close(pipe_hnd, mem_ctx, &user_pol);
 255         }
 256
 257         CHECK_RPC_ERR_DEBUG(rpccli_samr_lookup_names(pipe_hnd, mem_ctx,
 258                                                   &domain_pol, flags,
 259                                                   1, &const_acct_name,
 260                                                   &num_rids,
 261                                                   &user_rids, &name_types),
 262                             ("error looking up rid for user %s: %s\n",
 263                              acct_name, nt_errstr(result)));
 264
 265         if (name_types[0] != SID_NAME_USER) {
 266                 DEBUG(0, ("%s is not a user account (type=%d)\n", acct_name, name_types[0]));
 267                 goto done;
 268         }
 269
 270         user_rid = user_rids[0];
 271
 272         /* Open handle on user */
 273
 274         CHECK_RPC_ERR_DEBUG(
 275                 rpccli_samr_open_user(pipe_hnd, mem_ctx, &domain_pol,
 276                                    SEC_RIGHTS_MAXIMUM_ALLOWED,
 277                                    user_rid, &user_pol),
 278                 ("could not re-open existing user %s: %s\n",
 279                  acct_name, nt_errstr(result)));
 280
 281         /* Create a random machine account password */
 282
 283         {
 284                 char *str;
 285                 str = generate_random_str(DEFAULT_TRUST_ACCOUNT_PASSWORD_LENGTH);
 286                 clear_trust_password = SMB_STRDUP(str);
 287                 E_md4hash(clear_trust_password, md4_trust_password);
 288         }
 289
 290         encode_pw_buffer(pwbuf, clear_trust_password, STR_UNICODE);
 291
 292         /* Set password on machine account */
 293
 294         ZERO_STRUCT(ctr);
 295         ZERO_STRUCT(p24);
 296
 297         init_sam_user_info24(&p24, (char *)pwbuf,24);
 298
 299         ctr.switch_value = 24;
 300         ctr.info.id24 = &p24;
 301
 302         CHECK_RPC_ERR(rpccli_samr_set_userinfo(pipe_hnd, mem_ctx, &user_pol, 24,
 303                                             &cli->user_session_key, &ctr),
 304                       "error setting trust account password");
 305
 306         /* Why do we have to try to (re-)set the ACB to be the same as what
 307            we passed in the samr_create_dom_user() call?  When a NT
 308            workstation is joined to a domain by an administrator the
 309            acb_info is set to 0x80.  For a normal user with "Add
 310            workstations to the domain" rights the acb_info is 0x84.  I'm
 311            not sure whether it is supposed to make a difference or not.  NT
 312            seems to cope with either value so don't bomb out if the set
 313            userinfo2 level 0x10 fails.  -tpot */
 314
 315         ZERO_STRUCT(ctr);
 316         ctr.switch_value = 16;
 317         ctr.info.id16 = &p16;
 318
 319         init_sam_user_info16(&p16, acb_info);
 320
 321         /* Ignoring the return value is necessary for joining a domain
 322            as a normal user with "Add workstation to domain" privilege. */
 323
 324         result = rpccli_samr_set_userinfo2(pipe_hnd, mem_ctx, &user_pol, 16,
 325                                         &cli->user_session_key, &ctr);
 326
 327         rpccli_samr_close(pipe_hnd, mem_ctx, &user_pol);
 328         cli_rpc_pipe_close(pipe_hnd); /* Done with this pipe */
 329
 330         /* Now check the whole process from top-to-bottom */
 331
 332         pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_NETLOGON, &result);
 333         if (!pipe_hnd) {
 334                 DEBUG(0,("Error connecting to NETLOGON pipe. Error was %s\n",
 335                         nt_errstr(result) ));
 336                 goto done;
 337         }
 338
 339         result = rpccli_netlogon_setup_creds(pipe_hnd,
 340                                         cli->desthost, /* server name */
 341                                         domain,        /* domain */
 342                                         global_myname(), /* client name */
 343                                         global_myname(), /* machine account name */
 344                                         md4_trust_password,
 345                                         sec_channel_type,
 346                                         &neg_flags);
 347
 348         if (!NT_STATUS_IS_OK(result)) {
 349                 DEBUG(0, ("Error in domain join verification (credential setup failed): %s\n\n",
 350                           nt_errstr(result)));
 351
 352                 if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
 353                      (sec_channel_type == SEC_CHAN_BDC) ) {
 354                         d_fprintf(stderr, "Please make sure that no computer account\n"
 355                                  "named like this machine (%s) exists in the domain\n",
 356                                  global_myname());
 357                 }
 358
 359                 goto done;
 360         }
 361
 362         /* We can only check the schannel connection if the client is allowed
 363            to do this and the server supports it. If not, just assume success
 364            (after all the rpccli_netlogon_setup_creds() succeeded, and we'll
 365            do the same again (setup creds) in net_rpc_join_ok(). JRA. */
 366
 367         if (lp_client_schannel() && (neg_flags & NETLOGON_NEG_SCHANNEL)) {
 368                 struct rpc_pipe_client *netlogon_schannel_pipe =
 369                                                 cli_rpc_pipe_open_schannel_with_key(cli,
 370                                                         PI_NETLOGON,
 371                                                         PIPE_AUTH_LEVEL_PRIVACY,
 372                                                         domain,
 373                                                         pipe_hnd->dc,
 374                                                         &result);
 375
 376                 if (!NT_STATUS_IS_OK(result)) {
 377                         DEBUG(0, ("Error in domain join verification (schannel setup failed): %s\n\n",
 378                                   nt_errstr(result)));
 379
 380                         if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
 381                              (sec_channel_type == SEC_CHAN_BDC) ) {
 382                                 d_fprintf(stderr, "Please make sure that no computer account\n"
 383                                          "named like this machine (%s) exists in the domain\n",
 384                                          global_myname());
 385                         }
 386
 387                         goto done;
 388                 }
 389                 cli_rpc_pipe_close(netlogon_schannel_pipe);
 390         }
 391
 392         cli_rpc_pipe_close(pipe_hnd);
 393
 394         /* Now store the secret in the secrets database */
 395
 396         strupper_m(domain);
 397
 398         if (!secrets_store_domain_sid(domain, domain_sid)) {
 399                 DEBUG(0, ("error storing domain sid for %s\n", domain));
 400                 goto done;
 401         }
 402
 403         if (!secrets_store_machine_password(clear_trust_password, domain, sec_channel_type)) {
 404                 DEBUG(0, ("error storing plaintext domain secrets for %s\n", domain));
 405         }
 406
 407         /* double-check, connection from scratch */
 408         retval = net_rpc_join_ok(domain, cli->desthost, &cli->dest_ip);
 409
 410 done:
 411
 412         /* Display success or failure */
 413
 414         if (domain) {
 415                 if (retval != 0) {
 416                         fprintf(stderr,"Unable to join domain %s.\n",domain);
 417                 } else {
 418                         printf("Joined domain %s.\n",domain);
 419                 }
 420         }
 421
 422         cli_shutdown(cli);
 423
 424         SAFE_FREE(clear_trust_password);
 425
 426         return retval;
 427 }
 428
 429 /**
 430  * check that a join is OK
 431  *
 432  * @return A shell status integer (0 for success)
 433  *
 434  **/
 435 int net_rpc_testjoin(int argc, const char **argv)
 436 {
 437         char *domain = smb_xstrdup(opt_target_workgroup);
 438
 439         /* Display success or failure */
 440         if (net_rpc_join_ok(domain, NULL, NULL) != 0) {
 441                 fprintf(stderr,"Join to domain '%s' is not valid\n",domain);
 442                 free(domain);
 443                 return -1;
 444         }
 445
 446         printf("Join to '%s' is OK\n",domain);
 447         free(domain);
 448         return 0;
 449 }