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