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 /**
  40  * confirm that a domain join is still valid
  41  *
  42  * @return A shell status integer (0 for success)
  43  *
  44  **/
  45 int net_rpc_join_ok(const char *domain)
  46 {
  47         struct cli_state *cli;
  48         uchar stored_md4_trust_password[16];
  49         int retval = 1;
  50         uint32 channel;
  51         NTSTATUS result;
  52
  53         /* Connect to remote machine */
  54         if (!(cli = net_make_ipc_connection(NET_FLAGS_ANONYMOUS | NET_FLAGS_PDC))) {
  55                 return 1;
  56         }
  57
  58         if (!cli_nt_session_open(cli, PI_NETLOGON)) {
  59                 DEBUG(0,("Error connecting to NETLOGON pipe\n"));
  60                 goto done;
  61         }
  62
  63         if (!secrets_fetch_trust_account_password(domain,
  64                                                   stored_md4_trust_password,
  65                                                   NULL, &channel)) {
  66                 DEBUG(0,("Could not retreive domain trust secret"));
  67                 goto done;
  68         }
  69
  70         /* ensure that schannel uses the right domain */
  71         fstrcpy(cli->domain, domain);
  72         if (! NT_STATUS_IS_OK(result = cli_nt_establish_netlogon(cli, channel, stored_md4_trust_password))) {
  73                 DEBUG(0,("Error in domain join verfication\n"));
  74                 goto done;
  75         }
  76
  77         retval = 0;             /* Success! */
  78
  79 done:
  80         /* Close down pipe - this will clean up open policy handles */
  81         if (cli->nt_pipe_fnum)
  82                 cli_nt_session_close(cli);
  83
  84         cli_shutdown(cli);
  85
  86         return retval;
  87 }
  88
  89 /**
  90  * Join a domain using the administrator username and password
  91  *
  92  * @param argc  Standard main() style argc
  93  * @param argc  Standard main() style argv.  Initial components are already
  94  *              stripped.  Currently not used.
  95  * @return A shell status integer (0 for success)
  96  *
  97  **/
  98
  99 int net_rpc_join_newstyle(int argc, const char **argv)
 100 {
 101
 102         /* libsmb variables */
 103
 104         struct cli_state *cli;
 105         TALLOC_CTX *mem_ctx;
 106         uint32 acb_info = ACB_WSTRUST;
 107         uint32 sec_channel_type;
 108
 109         /* rpc variables */
 110
 111         POLICY_HND lsa_pol, sam_pol, domain_pol, user_pol;
 112         DOM_SID domain_sid;
 113         uint32 user_rid;
 114
 115         /* Password stuff */
 116
 117         char *clear_trust_password = NULL;
 118         fstring ucs2_trust_password;
 119         int ucs2_pw_len;
 120         uchar pwbuf[516];
 121         SAM_USERINFO_CTR ctr;
 122         SAM_USER_INFO_24 p24;
 123         SAM_USER_INFO_10 p10;
 124         uchar md4_trust_password[16];
 125
 126         /* Misc */
 127
 128         NTSTATUS result;
 129         int retval = 1;
 130         fstring domain;
 131         uint32 num_rids, *name_types, *user_rids;
 132         uint32 flags = 0x3e8;
 133         char *acct_name;
 134         const char *const_acct_name;
 135
 136         /* check what type of join */
 137         if (argc >= 0) {
 138                 sec_channel_type = get_sec_channel_type(argv[0]);
 139         } else {
 140                 sec_channel_type = get_sec_channel_type(NULL);
 141         }
 142
 143         switch (sec_channel_type) {
 144         case SEC_CHAN_WKSTA:
 145                 acb_info = ACB_WSTRUST;
 146                 break;
 147         case SEC_CHAN_BDC:
 148                 acb_info = ACB_SVRTRUST;
 149                 break;
 150 #if 0
 151         case SEC_CHAN_DOMAIN:
 152                 acb_info = ACB_DOMTRUST;
 153                 break;
 154 #endif
 155         }
 156
 157         /* Connect to remote machine */
 158
 159         if (!(cli = net_make_ipc_connection(NET_FLAGS_PDC)))
 160                 return 1;
 161
 162         if (!(mem_ctx = talloc_init("net_rpc_join_newstyle"))) {
 163                 DEBUG(0, ("Could not initialise talloc context\n"));
 164                 goto done;
 165         }
 166
 167         /* Fetch domain sid */
 168
 169         if (!cli_nt_session_open(cli, PI_LSARPC)) {
 170                 DEBUG(0, ("Error connecting to LSA pipe\n"));
 171                 goto done;
 172         }
 173
 174
 175         CHECK_RPC_ERR(cli_lsa_open_policy(cli, mem_ctx, True,
 176                                           SEC_RIGHTS_MAXIMUM_ALLOWED,
 177                                           &lsa_pol),
 178                       "error opening lsa policy handle");
 179
 180         CHECK_RPC_ERR(cli_lsa_query_info_policy(cli, mem_ctx, &lsa_pol,
 181                                                 5, domain, &domain_sid),
 182                       "error querying info policy");
 183
 184         cli_lsa_close(cli, mem_ctx, &lsa_pol);
 185
 186         cli_nt_session_close(cli); /* Done with this pipe */
 187
 188         /* Create domain user */
 189         if (!cli_nt_session_open(cli, PI_SAMR)) {
 190                 DEBUG(0, ("Error connecting to SAM pipe\n"));
 191                 goto done;
 192         }
 193
 194         CHECK_RPC_ERR(cli_samr_connect(cli, mem_ctx,
 195                                        SEC_RIGHTS_MAXIMUM_ALLOWED,
 196                                        &sam_pol),
 197                       "could not connect to SAM database");
 198
 199
 200         CHECK_RPC_ERR(cli_samr_open_domain(cli, mem_ctx, &sam_pol,
 201                                            SEC_RIGHTS_MAXIMUM_ALLOWED,
 202                                            &domain_sid, &domain_pol),
 203                       "could not open domain");
 204
 205         /* Create domain user */
 206         acct_name = talloc_asprintf(mem_ctx, "%s$", global_myname());
 207         strlower_m(acct_name);
 208         const_acct_name = acct_name;
 209
 210         result = cli_samr_create_dom_user(cli, mem_ctx, &domain_pol,
 211                                           acct_name, acb_info,
 212                                           0xe005000b, &user_pol,
 213                                           &user_rid);
 214
 215         if (!NT_STATUS_IS_OK(result) &&
 216             !NT_STATUS_EQUAL(result, NT_STATUS_USER_EXISTS)) {
 217                 d_printf("Create of workstation account failed\n");
 218
 219                 /* If NT_STATUS_ACCESS_DENIED then we have a valid
 220                    username/password combo but the user does not have
 221                    administrator access. */
 222
 223                 if (NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED))
 224                         d_printf("User specified does not have administrator privileges\n");
 225
 226                 goto done;
 227         }
 228
 229         /* We *must* do this.... don't ask... */
 230
 231         if (NT_STATUS_IS_OK(result))
 232                 cli_samr_close(cli, mem_ctx, &user_pol);
 233
 234         CHECK_RPC_ERR_DEBUG(cli_samr_lookup_names(cli, mem_ctx,
 235                                                   &domain_pol, flags,
 236                                                   1, &const_acct_name,
 237                                                   &num_rids,
 238                                                   &user_rids, &name_types),
 239                             ("error looking up rid for user %s: %s\n",
 240                              acct_name, nt_errstr(result)));
 241
 242         if (name_types[0] != SID_NAME_USER) {
 243                 DEBUG(0, ("%s is not a user account (type=%d)\n", acct_name, name_types[0]));
 244                 goto done;
 245         }
 246
 247         user_rid = user_rids[0];
 248
 249         /* Open handle on user */
 250
 251         CHECK_RPC_ERR_DEBUG(
 252                 cli_samr_open_user(cli, mem_ctx, &domain_pol,
 253                                    SEC_RIGHTS_MAXIMUM_ALLOWED,
 254                                    user_rid, &user_pol),
 255                 ("could not re-open existing user %s: %s\n",
 256                  acct_name, nt_errstr(result)));
 257
 258         /* Create a random machine account password */
 259
 260         {
 261                 char *str;
 262                 str = generate_random_str(DEFAULT_TRUST_ACCOUNT_PASSWORD_LENGTH);
 263                 clear_trust_password = strdup(str);
 264                 E_md4hash(clear_trust_password, md4_trust_password);
 265         }
 266
 267         ucs2_pw_len = push_ucs2(NULL, ucs2_trust_password,
 268                                 clear_trust_password,
 269                                 sizeof(ucs2_trust_password), 0);
 270
 271         encode_pw_buffer((char *)pwbuf, ucs2_trust_password,
 272                          ucs2_pw_len);
 273
 274         /* Set password on machine account */
 275
 276         ZERO_STRUCT(ctr);
 277         ZERO_STRUCT(p24);
 278
 279         init_sam_user_info24(&p24, (char *)pwbuf,24);
 280
 281         ctr.switch_value = 24;
 282         ctr.info.id24 = &p24;
 283
 284         CHECK_RPC_ERR(cli_samr_set_userinfo(cli, mem_ctx, &user_pol, 24,
 285                                             cli->user_session_key, &ctr),
 286                       "error setting trust account password");
 287
 288         /* Why do we have to try to (re-)set the ACB to be the same as what
 289            we passed in the samr_create_dom_user() call?  When a NT
 290            workstation is joined to a domain by an administrator the
 291            acb_info is set to 0x80.  For a normal user with "Add
 292            workstations to the domain" rights the acb_info is 0x84.  I'm
 293            not sure whether it is supposed to make a difference or not.  NT
 294            seems to cope with either value so don't bomb out if the set
 295            userinfo2 level 0x10 fails.  -tpot */
 296
 297         ZERO_STRUCT(ctr);
 298         ctr.switch_value = 0x10;
 299         ctr.info.id10 = &p10;
 300
 301         init_sam_user_info10(&p10, acb_info);
 302
 303         /* Ignoring the return value is necessary for joining a domain
 304            as a normal user with "Add workstation to domain" privilege. */
 305
 306         result = cli_samr_set_userinfo2(cli, mem_ctx, &user_pol, 0x10,
 307                                         cli->user_session_key, &ctr);
 308
 309         /* Now check the whole process from top-to-bottom */
 310         cli_samr_close(cli, mem_ctx, &user_pol);
 311         cli_nt_session_close(cli); /* Done with this pipe */
 312
 313         if (!cli_nt_session_open(cli, PI_NETLOGON)) {
 314                 DEBUG(0,("Error connecting to NETLOGON pipe\n"));
 315                 goto done;
 316         }
 317
 318         /* ensure that schannel uses the right domain */
 319         fstrcpy(cli->domain, domain);
 320
 321         result = cli_nt_establish_netlogon(cli, sec_channel_type,
 322                                            md4_trust_password);
 323
 324         if (!NT_STATUS_IS_OK(result)) {
 325                 DEBUG(0, ("Error domain join verification: %s\n\n",
 326                           nt_errstr(result)));
 327
 328                 if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
 329                      (sec_channel_type == SEC_CHAN_BDC) ) {
 330                         d_printf("Please make sure that no computer account\n"
 331                                  "named like this machine (%s) exists in the domain\n",
 332                                  global_myname());
 333                 }
 334
 335                 goto done;
 336         }
 337
 338         /* Now store the secret in the secrets database */
 339
 340         strupper_m(domain);
 341
 342         if (!secrets_store_domain_sid(domain, &domain_sid)) {
 343                 DEBUG(0, ("error storing domain sid for %s\n", domain));
 344                 goto done;
 345         }
 346
 347         if (!secrets_store_machine_password(clear_trust_password, domain, sec_channel_type)) {
 348                 DEBUG(0, ("error storing plaintext domain secrets for %s\n", domain));
 349         }
 350
 351         /* double-check, connection from scratch */
 352         retval = net_rpc_join_ok(domain);
 353
 354 done:
 355         /* Close down pipe - this will clean up open policy handles */
 356
 357         if (cli->nt_pipe_fnum)
 358                 cli_nt_session_close(cli);
 359
 360         /* Display success or failure */
 361
 362         if (retval != 0) {
 363                 fprintf(stderr,"Unable to join domain %s.\n",domain);
 364         } else {
 365                 printf("Joined domain %s.\n",domain);
 366         }
 367
 368         cli_shutdown(cli);
 369
 370         SAFE_FREE(clear_trust_password);
 371
 372         return retval;
 373 }
 374
 375
 376 /**
 377  * check that a join is OK
 378  *
 379  * @return A shell status integer (0 for success)
 380  *
 381  **/
 382 int net_rpc_testjoin(int argc, const char **argv)
 383 {
 384         char *domain = smb_xstrdup(opt_target_workgroup);
 385
 386         /* Display success or failure */
 387         if (net_rpc_join_ok(domain) != 0) {
 388                 fprintf(stderr,"Join to domain '%s' is not valid\n",domain);
 389                 free(domain);
 390                 return -1;
 391         }
 392
 393         printf("Join to '%s' is OK\n",domain);
 394         free(domain);
 395         return 0;
 396 }