source3/auth/auth_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Authentication utility functions
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Andrew Bartlett 2001
   6    Copyright (C) Jeremy Allison 2000-2001
   7    Copyright (C) Rafal Szczesniak 2002
   8    Copyright (C) Volker Lendecke 2006
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_AUTH
  29
  30 static struct nt_user_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
  31                                                    const DOM_SID *user_sid,
  32                                                    const DOM_SID *group_sid,
  33                                                    BOOL is_guest,
  34                                                    int num_groupsids,
  35                                                    const DOM_SID *groupsids);
  36
  37 /****************************************************************************
  38  Create a UNIX user on demand.
  39 ****************************************************************************/
  40
  41 static int smb_create_user(const char *domain, const char *unix_username, const char *homedir)
  42 {
  43         pstring add_script;
  44         int ret;
  45
  46         pstrcpy(add_script, lp_adduser_script());
  47         if (! *add_script)
  48                 return -1;
  49         all_string_sub(add_script, "%u", unix_username, sizeof(pstring));
  50         if (domain)
  51                 all_string_sub(add_script, "%D", domain, sizeof(pstring));
  52         if (homedir)
  53                 all_string_sub(add_script, "%H", homedir, sizeof(pstring));
  54         ret = smbrun(add_script,NULL);
  55         flush_pwnam_cache();
  56         DEBUG(ret ? 0 : 3,("smb_create_user: Running the command `%s' gave %d\n",add_script,ret));
  57         return ret;
  58 }
  59
  60 /****************************************************************************
  61  Create an auth_usersupplied_data structure
  62 ****************************************************************************/
  63
  64 static NTSTATUS make_user_info(auth_usersupplied_info **user_info,
  65                                const char *smb_name,
  66                                const char *internal_username,
  67                                const char *client_domain,
  68                                const char *domain,
  69                                const char *wksta_name,
  70                                DATA_BLOB *lm_pwd, DATA_BLOB *nt_pwd,
  71                                DATA_BLOB *lm_interactive_pwd, DATA_BLOB *nt_interactive_pwd,
  72                                DATA_BLOB *plaintext,
  73                                BOOL encrypted)
  74 {
  75
  76         DEBUG(5,("attempting to make a user_info for %s (%s)\n", internal_username, smb_name));
  77
  78         *user_info = SMB_MALLOC_P(auth_usersupplied_info);
  79         if (*user_info == NULL) {
  80                 DEBUG(0,("malloc failed for user_info (size %lu)\n", (unsigned long)sizeof(*user_info)));
  81                 return NT_STATUS_NO_MEMORY;
  82         }
  83
  84         ZERO_STRUCTP(*user_info);
  85
  86         DEBUG(5,("making strings for %s's user_info struct\n", internal_username));
  87
  88         (*user_info)->smb_name = SMB_STRDUP(smb_name);
  89         if ((*user_info)->smb_name == NULL) {
  90                 free_user_info(user_info);
  91                 return NT_STATUS_NO_MEMORY;
  92         }
  93
  94         (*user_info)->internal_username = SMB_STRDUP(internal_username);
  95         if ((*user_info)->internal_username == NULL) {
  96                 free_user_info(user_info);
  97                 return NT_STATUS_NO_MEMORY;
  98         }
  99
 100         (*user_info)->domain = SMB_STRDUP(domain);
 101         if ((*user_info)->domain == NULL) {
 102                 free_user_info(user_info);
 103                 return NT_STATUS_NO_MEMORY;
 104         }
 105
 106         (*user_info)->client_domain = SMB_STRDUP(client_domain);
 107         if ((*user_info)->client_domain == NULL) {
 108                 free_user_info(user_info);
 109                 return NT_STATUS_NO_MEMORY;
 110         }
 111
 112         (*user_info)->wksta_name = SMB_STRDUP(wksta_name);
 113         if ((*user_info)->wksta_name == NULL) {
 114                 free_user_info(user_info);
 115                 return NT_STATUS_NO_MEMORY;
 116         }
 117
 118         DEBUG(5,("making blobs for %s's user_info struct\n", internal_username));
 119
 120         if (lm_pwd)
 121                 (*user_info)->lm_resp = data_blob(lm_pwd->data, lm_pwd->length);
 122         if (nt_pwd)
 123                 (*user_info)->nt_resp = data_blob(nt_pwd->data, nt_pwd->length);
 124         if (lm_interactive_pwd)
 125                 (*user_info)->lm_interactive_pwd = data_blob(lm_interactive_pwd->data, lm_interactive_pwd->length);
 126         if (nt_interactive_pwd)
 127                 (*user_info)->nt_interactive_pwd = data_blob(nt_interactive_pwd->data, nt_interactive_pwd->length);
 128
 129         if (plaintext)
 130                 (*user_info)->plaintext_password = data_blob(plaintext->data, plaintext->length);
 131
 132         (*user_info)->encrypted = encrypted;
 133
 134         (*user_info)->logon_parameters = 0;
 135
 136         DEBUG(10,("made an %sencrypted user_info for %s (%s)\n", encrypted ? "":"un" , internal_username, smb_name));
 137
 138         return NT_STATUS_OK;
 139 }
 140
 141 /****************************************************************************
 142  Create an auth_usersupplied_data structure after appropriate mapping.
 143 ****************************************************************************/
 144
 145 NTSTATUS make_user_info_map(auth_usersupplied_info **user_info,
 146                             const char *smb_name,
 147                             const char *client_domain,
 148                             const char *wksta_name,
 149                             DATA_BLOB *lm_pwd, DATA_BLOB *nt_pwd,
 150                             DATA_BLOB *lm_interactive_pwd, DATA_BLOB *nt_interactive_pwd,
 151                             DATA_BLOB *plaintext,
 152                             BOOL encrypted)
 153 {
 154         const char *domain;
 155         NTSTATUS result;
 156         BOOL was_mapped;
 157         fstring internal_username;
 158         fstrcpy(internal_username, smb_name);
 159         was_mapped = map_username(internal_username);
 160
 161         DEBUG(5, ("make_user_info_map: Mapping user [%s]\\[%s] from workstation [%s]\n",
 162               client_domain, smb_name, wksta_name));
 163
 164         /* don't allow "" as a domain, fixes a Win9X bug
 165            where it doens't supply a domain for logon script
 166            'net use' commands.                                 */
 167
 168         if ( *client_domain )
 169                 domain = client_domain;
 170         else
 171                 domain = lp_workgroup();
 172
 173         /* do what win2k does.  Always map unknown domains to our own
 174            and let the "passdb backend" handle unknown users. */
 175
 176         if ( !is_trusted_domain(domain) && !strequal(domain, get_global_sam_name()) )
 177                 domain = my_sam_name();
 178
 179         /* we know that it is a trusted domain (and we are allowing them) or it is our domain */
 180
 181         result = make_user_info(user_info, smb_name, internal_username,
 182                               client_domain, domain, wksta_name,
 183                               lm_pwd, nt_pwd,
 184                               lm_interactive_pwd, nt_interactive_pwd,
 185                               plaintext, encrypted);
 186         if (NT_STATUS_IS_OK(result)) {
 187                 (*user_info)->was_mapped = was_mapped;
 188         }
 189         return result;
 190 }
 191
 192 /****************************************************************************
 193  Create an auth_usersupplied_data, making the DATA_BLOBs here.
 194  Decrypt and encrypt the passwords.
 195 ****************************************************************************/
 196
 197 BOOL make_user_info_netlogon_network(auth_usersupplied_info **user_info,
 198                                      const char *smb_name,
 199                                      const char *client_domain,
 200                                      const char *wksta_name,
 201                                      uint32 logon_parameters,
 202                                      const uchar *lm_network_pwd,
 203                                      int lm_pwd_len,
 204                                      const uchar *nt_network_pwd,
 205                                      int nt_pwd_len)
 206 {
 207         BOOL ret;
 208         NTSTATUS status;
 209         DATA_BLOB lm_blob = data_blob(lm_network_pwd, lm_pwd_len);
 210         DATA_BLOB nt_blob = data_blob(nt_network_pwd, nt_pwd_len);
 211
 212         status = make_user_info_map(user_info,
 213                                     smb_name, client_domain,
 214                                     wksta_name,
 215                                     lm_pwd_len ? &lm_blob : NULL,
 216                                     nt_pwd_len ? &nt_blob : NULL,
 217                                     NULL, NULL, NULL,
 218                                     True);
 219
 220         if (NT_STATUS_IS_OK(status)) {
 221                 (*user_info)->logon_parameters = logon_parameters;
 222         }
 223         ret = NT_STATUS_IS_OK(status) ? True : False;
 224
 225         data_blob_free(&lm_blob);
 226         data_blob_free(&nt_blob);
 227         return ret;
 228 }
 229
 230 /****************************************************************************
 231  Create an auth_usersupplied_data, making the DATA_BLOBs here.
 232  Decrypt and encrypt the passwords.
 233 ****************************************************************************/
 234
 235 BOOL make_user_info_netlogon_interactive(auth_usersupplied_info **user_info,
 236                                          const char *smb_name,
 237                                          const char *client_domain,
 238                                          const char *wksta_name,
 239                                          uint32 logon_parameters,
 240                                          const uchar chal[8],
 241                                          const uchar lm_interactive_pwd[16],
 242                                          const uchar nt_interactive_pwd[16],
 243                                          const uchar *dc_sess_key)
 244 {
 245         char lm_pwd[16];
 246         char nt_pwd[16];
 247         unsigned char local_lm_response[24];
 248         unsigned char local_nt_response[24];
 249         unsigned char key[16];
 250
 251         ZERO_STRUCT(key);
 252         memcpy(key, dc_sess_key, 8);
 253
 254         if (lm_interactive_pwd)
 255                 memcpy(lm_pwd, lm_interactive_pwd, sizeof(lm_pwd));
 256
 257         if (nt_interactive_pwd)
 258                 memcpy(nt_pwd, nt_interactive_pwd, sizeof(nt_pwd));
 259
 260 #ifdef DEBUG_PASSWORD
 261         DEBUG(100,("key:"));
 262         dump_data(100, (char *)key, sizeof(key));
 263
 264         DEBUG(100,("lm owf password:"));
 265         dump_data(100, lm_pwd, sizeof(lm_pwd));
 266
 267         DEBUG(100,("nt owf password:"));
 268         dump_data(100, nt_pwd, sizeof(nt_pwd));
 269 #endif
 270
 271         if (lm_interactive_pwd)
 272                 SamOEMhash((uchar *)lm_pwd, key, sizeof(lm_pwd));
 273
 274         if (nt_interactive_pwd)
 275                 SamOEMhash((uchar *)nt_pwd, key, sizeof(nt_pwd));
 276
 277 #ifdef DEBUG_PASSWORD
 278         DEBUG(100,("decrypt of lm owf password:"));
 279         dump_data(100, lm_pwd, sizeof(lm_pwd));
 280
 281         DEBUG(100,("decrypt of nt owf password:"));
 282         dump_data(100, nt_pwd, sizeof(nt_pwd));
 283 #endif
 284
 285         if (lm_interactive_pwd)
 286                 SMBOWFencrypt((const unsigned char *)lm_pwd, chal,
 287                               local_lm_response);
 288
 289         if (nt_interactive_pwd)
 290                 SMBOWFencrypt((const unsigned char *)nt_pwd, chal,
 291                               local_nt_response);
 292
 293         /* Password info paranoia */
 294         ZERO_STRUCT(key);
 295
 296         {
 297                 BOOL ret;
 298                 NTSTATUS nt_status;
 299                 DATA_BLOB local_lm_blob;
 300                 DATA_BLOB local_nt_blob;
 301
 302                 DATA_BLOB lm_interactive_blob;
 303                 DATA_BLOB nt_interactive_blob;
 304
 305                 if (lm_interactive_pwd) {
 306                         local_lm_blob = data_blob(local_lm_response,
 307                                                   sizeof(local_lm_response));
 308                         lm_interactive_blob = data_blob(lm_pwd,
 309                                                         sizeof(lm_pwd));
 310                         ZERO_STRUCT(lm_pwd);
 311                 }
 312
 313                 if (nt_interactive_pwd) {
 314                         local_nt_blob = data_blob(local_nt_response,
 315                                                   sizeof(local_nt_response));
 316                         nt_interactive_blob = data_blob(nt_pwd,
 317                                                         sizeof(nt_pwd));
 318                         ZERO_STRUCT(nt_pwd);
 319                 }
 320
 321                 nt_status = make_user_info_map(
 322                         user_info,
 323                         smb_name, client_domain, wksta_name,
 324                         lm_interactive_pwd ? &local_lm_blob : NULL,
 325                         nt_interactive_pwd ? &local_nt_blob : NULL,
 326                         lm_interactive_pwd ? &lm_interactive_blob : NULL,
 327                         nt_interactive_pwd ? &nt_interactive_blob : NULL,
 328                         NULL, True);
 329
 330                 if (NT_STATUS_IS_OK(nt_status)) {
 331                         (*user_info)->logon_parameters = logon_parameters;
 332                 }
 333
 334                 ret = NT_STATUS_IS_OK(nt_status) ? True : False;
 335                 data_blob_free(&local_lm_blob);
 336                 data_blob_free(&local_nt_blob);
 337                 data_blob_free(&lm_interactive_blob);
 338                 data_blob_free(&nt_interactive_blob);
 339                 return ret;
 340         }
 341 }
 342
 343
 344 /****************************************************************************
 345  Create an auth_usersupplied_data structure
 346 ****************************************************************************/
 347
 348 BOOL make_user_info_for_reply(auth_usersupplied_info **user_info,
 349                               const char *smb_name,
 350                               const char *client_domain,
 351                               const uint8 chal[8],
 352                               DATA_BLOB plaintext_password)
 353 {
 354
 355         DATA_BLOB local_lm_blob;
 356         DATA_BLOB local_nt_blob;
 357         NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
 358
 359         /*
 360          * Not encrypted - do so.
 361          */
 362
 363         DEBUG(5,("make_user_info_for_reply: User passwords not in encrypted "
 364                  "format.\n"));
 365
 366         if (plaintext_password.data) {
 367                 unsigned char local_lm_response[24];
 368
 369 #ifdef DEBUG_PASSWORD
 370                 DEBUG(10,("Unencrypted password (len %d):\n",
 371                           (int)plaintext_password.length));
 372                 dump_data(100, (const char *)plaintext_password.data,
 373                           plaintext_password.length);
 374 #endif
 375
 376                 SMBencrypt( (const char *)plaintext_password.data,
 377                             (const uchar*)chal, local_lm_response);
 378                 local_lm_blob = data_blob(local_lm_response, 24);
 379
 380                 /* We can't do an NT hash here, as the password needs to be
 381                    case insensitive */
 382                 local_nt_blob = data_blob(NULL, 0);
 383
 384         } else {
 385                 local_lm_blob = data_blob(NULL, 0);
 386                 local_nt_blob = data_blob(NULL, 0);
 387         }
 388
 389         ret = make_user_info_map(
 390                 user_info, smb_name, client_domain,
 391                 get_remote_machine_name(),
 392                 local_lm_blob.data ? &local_lm_blob : NULL,
 393                 local_nt_blob.data ? &local_nt_blob : NULL,
 394                 NULL, NULL,
 395                 plaintext_password.data ? &plaintext_password : NULL,
 396                 False);
 397
 398         data_blob_free(&local_lm_blob);
 399         return NT_STATUS_IS_OK(ret) ? True : False;
 400 }
 401
 402 /****************************************************************************
 403  Create an auth_usersupplied_data structure
 404 ****************************************************************************/
 405
 406 NTSTATUS make_user_info_for_reply_enc(auth_usersupplied_info **user_info,
 407                                       const char *smb_name,
 408                                       const char *client_domain,
 409                                       DATA_BLOB lm_resp, DATA_BLOB nt_resp)
 410 {
 411         return make_user_info_map(user_info, smb_name,
 412                                   client_domain,
 413                                   get_remote_machine_name(),
 414                                   lm_resp.data ? &lm_resp : NULL,
 415                                   nt_resp.data ? &nt_resp : NULL,
 416                                   NULL, NULL, NULL,
 417                                   True);
 418 }
 419
 420 /****************************************************************************
 421  Create a guest user_info blob, for anonymous authenticaion.
 422 ****************************************************************************/
 423
 424 BOOL make_user_info_guest(auth_usersupplied_info **user_info)
 425 {
 426         NTSTATUS nt_status;
 427
 428         nt_status = make_user_info(user_info,
 429                                    "","",
 430                                    "","",
 431                                    "",
 432                                    NULL, NULL,
 433                                    NULL, NULL,
 434                                    NULL,
 435                                    True);
 436
 437         return NT_STATUS_IS_OK(nt_status) ? True : False;
 438 }
 439
 440 /****************************************************************************
 441  prints a NT_USER_TOKEN to debug output.
 442 ****************************************************************************/
 443
 444 void debug_nt_user_token(int dbg_class, int dbg_lev, NT_USER_TOKEN *token)
 445 {
 446         size_t     i;
 447
 448         if (!token) {
 449                 DEBUGC(dbg_class, dbg_lev, ("NT user token: (NULL)\n"));
 450                 return;
 451         }
 452
 453         DEBUGC(dbg_class, dbg_lev,
 454                ("NT user token of user %s\n",
 455                 sid_string_static(&token->user_sids[0]) ));
 456         DEBUGADDC(dbg_class, dbg_lev,
 457                   ("contains %lu SIDs\n", (unsigned long)token->num_sids));
 458         for (i = 0; i < token->num_sids; i++)
 459                 DEBUGADDC(dbg_class, dbg_lev,
 460                           ("SID[%3lu]: %s\n", (unsigned long)i,
 461                            sid_string_static(&token->user_sids[i])));
 462
 463         dump_se_priv( dbg_class, dbg_lev, &token->privileges );
 464 }
 465
 466 /****************************************************************************
 467  prints a UNIX 'token' to debug output.
 468 ****************************************************************************/
 469
 470 void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
 471                            int n_groups, gid_t *groups)
 472 {
 473         int     i;
 474         DEBUGC(dbg_class, dbg_lev,
 475                ("UNIX token of user %ld\n", (long int)uid));
 476
 477         DEBUGADDC(dbg_class, dbg_lev,
 478                   ("Primary group is %ld and contains %i supplementary "
 479                    "groups\n", (long int)gid, n_groups));
 480         for (i = 0; i < n_groups; i++)
 481                 DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
 482                         (long int)groups[i]));
 483 }
 484
 485 /******************************************************************************
 486  Create a token for the root user to be used internally by smbd.
 487  This is similar to running under the context of the LOCAL_SYSTEM account
 488  in Windows.  This is a read-only token.  Do not modify it or free() it.
 489  Create a copy if your need to change it.
 490 ******************************************************************************/
 491
 492 NT_USER_TOKEN *get_root_nt_token( void )
 493 {
 494         static NT_USER_TOKEN *token = NULL;
 495         DOM_SID u_sid, g_sid;
 496         struct passwd *pw;
 497
 498         if ( token )
 499                 return token;
 500
 501         if ( !(pw = sys_getpwnam( "root" )) ) {
 502                 DEBUG(0,("get_root_nt_token: getpwnam\"root\") failed!\n"));
 503                 return NULL;
 504         }
 505
 506         /* get the user and primary group SIDs; although the
 507            BUILTIN\Administrators SId is really the one that matters here */
 508
 509         uid_to_sid(&u_sid, pw->pw_uid);
 510         gid_to_sid(&g_sid, pw->pw_gid);
 511
 512         token = create_local_nt_token(NULL, &u_sid, &g_sid, False,
 513                                       1, &global_sid_Builtin_Administrators);
 514         return token;
 515 }
 516
 517 static int server_info_dtor(void *p)
 518 {
 519         auth_serversupplied_info *server_info =
 520                 talloc_get_type_abort(p, auth_serversupplied_info);
 521
 522         if (server_info->sam_account != NULL) {
 523                 TALLOC_FREE(server_info->sam_account);
 524         }
 525
 526         ZERO_STRUCTP(server_info);
 527         return 0;
 528 }
 529
 530 /***************************************************************************
 531  Make a server_info struct. Free with TALLOC_FREE().
 532 ***************************************************************************/
 533
 534 static auth_serversupplied_info *make_server_info(TALLOC_CTX *mem_ctx)
 535 {
 536         struct auth_serversupplied_info *result;
 537
 538         result = TALLOC_ZERO_P(mem_ctx, auth_serversupplied_info);
 539         if (result == NULL) {
 540                 DEBUG(0, ("talloc failed\n"));
 541                 return NULL;
 542         }
 543
 544         talloc_set_destructor(result, server_info_dtor);
 545
 546         /* Initialise the uid and gid values to something non-zero
 547            which may save us from giving away root access if there
 548            is a bug in allocating these fields. */
 549
 550         result->uid = -1;
 551         result->gid = -1;
 552         return result;
 553 }
 554
 555 /***************************************************************************
 556  Make (and fill) a user_info struct from a struct samu
 557 ***************************************************************************/
 558
 559 NTSTATUS make_server_info_sam(auth_serversupplied_info **server_info,
 560                               struct samu *sampass)
 561 {
 562         NTSTATUS status;
 563         struct passwd *pwd;
 564         gid_t *gids;
 565         auth_serversupplied_info *result;
 566
 567         if ( !(pwd = getpwnam_alloc(NULL, pdb_get_username(sampass))) ) {
 568                 DEBUG(1, ("User %s in passdb, but getpwnam() fails!\n",
 569                           pdb_get_username(sampass)));
 570                 return NT_STATUS_NO_SUCH_USER;
 571         }
 572
 573         if ( !(result = make_server_info(NULL)) ) {
 574                 TALLOC_FREE(pwd);
 575                 return NT_STATUS_NO_MEMORY;
 576         }
 577
 578         result->sam_account = sampass;
 579         result->unix_name = talloc_strdup(result, pwd->pw_name);
 580         result->gid = pwd->pw_gid;
 581         result->uid = pwd->pw_uid;
 582
 583         TALLOC_FREE(pwd);
 584
 585         status = pdb_enum_group_memberships(result, sampass,
 586                                             &result->sids, &gids,
 587                                             &result->num_sids);
 588
 589         if (!NT_STATUS_IS_OK(status)) {
 590                 DEBUG(10, ("pdb_enum_group_memberships failed: %s\n",
 591                            nt_errstr(status)));
 592                 result->sam_account = NULL; /* Don't free on error exit. */
 593                 TALLOC_FREE(result);
 594                 return status;
 595         }
 596
 597         /* For now we throw away the gids and convert via sid_to_gid
 598          * later. This needs fixing, but I'd like to get the code straight and
 599          * simple first. */
 600         TALLOC_FREE(gids);
 601
 602         DEBUG(5,("make_server_info_sam: made server info for user %s -> %s\n",
 603                  pdb_get_username(sampass), result->unix_name));
 604
 605         *server_info = result;
 606
 607         return NT_STATUS_OK;
 608 }
 609
 610 /*
 611  * Add alias SIDs from memberships within the partially created token SID list
 612  */
 613
 614 static NTSTATUS add_aliases(TALLOC_CTX *tmp_ctx, const DOM_SID *domain_sid,
 615                             struct nt_user_token *token)
 616 {
 617         uint32 *aliases;
 618         size_t i, num_aliases;
 619         NTSTATUS status;
 620
 621         aliases = NULL;
 622         num_aliases = 0;
 623
 624         status = pdb_enum_alias_memberships(tmp_ctx, domain_sid,
 625                                             token->user_sids,
 626                                             token->num_sids,
 627                                             &aliases, &num_aliases);
 628
 629         if (!NT_STATUS_IS_OK(status)) {
 630                 DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n",
 631                            nt_errstr(status)));
 632                 return status;
 633         }
 634
 635         for (i=0; i<num_aliases; i++) {
 636                 DOM_SID alias_sid;
 637                 sid_compose(&alias_sid, domain_sid, aliases[i]);
 638                 add_sid_to_array_unique(token, &alias_sid,
 639                                         &token->user_sids,
 640                                         &token->num_sids);
 641                 if (token->user_sids == NULL) {
 642                         DEBUG(0, ("add_sid_to_array failed\n"));
 643                         return NT_STATUS_NO_MEMORY;
 644                 }
 645         }
 646
 647         return NT_STATUS_OK;
 648 }
 649
 650 static NTSTATUS log_nt_token(TALLOC_CTX *tmp_ctx, NT_USER_TOKEN *token)
 651 {
 652         char *command;
 653         char *group_sidstr;
 654         size_t i;
 655
 656         if ((lp_log_nt_token_command() == NULL) ||
 657             (strlen(lp_log_nt_token_command()) == 0)) {
 658                 return NT_STATUS_OK;
 659         }
 660
 661         group_sidstr = talloc_strdup(tmp_ctx, "");
 662         for (i=1; i<token->num_sids; i++) {
 663                 group_sidstr = talloc_asprintf(
 664                         tmp_ctx, "%s %s", group_sidstr,
 665                         sid_string_static(&token->user_sids[i]));
 666         }
 667
 668         command = talloc_string_sub(
 669                 tmp_ctx, lp_log_nt_token_command(),
 670                 "%s", sid_string_static(&token->user_sids[0]));
 671         command = talloc_string_sub(tmp_ctx, command, "%t", group_sidstr);
 672
 673         if (command == NULL) {
 674                 return NT_STATUS_NO_MEMORY;
 675         }
 676
 677         DEBUG(8, ("running command: [%s]\n", command));
 678         if (smbrun(command, NULL) != 0) {
 679                 DEBUG(0, ("Could not log NT token\n"));
 680                 return NT_STATUS_ACCESS_DENIED;
 681         }
 682
 683         return NT_STATUS_OK;
 684 }
 685
 686 /*******************************************************************
 687 *******************************************************************/
 688
 689 static NTSTATUS add_builtin_administrators( TALLOC_CTX *ctx, struct nt_user_token *token )
 690 {
 691         DOM_SID domadm;
 692
 693         /* nothing to do if we aren't in a domain */
 694
 695         if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) {
 696                 return NT_STATUS_OK;
 697         }
 698
 699         /* Find the Domain Admins SID */
 700
 701         if ( IS_DC ) {
 702                 sid_copy( &domadm, get_global_sam_sid() );
 703         } else {
 704                 if ( !secrets_fetch_domain_sid( lp_workgroup(), &domadm ) )
 705                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 706         }
 707         sid_append_rid( &domadm, DOMAIN_GROUP_RID_ADMINS );
 708
 709         /* Add Administrators if the user beloongs to Domain Admins */
 710
 711         if ( nt_token_check_sid( &domadm, token ) ) {
 712                 add_sid_to_array(token, &global_sid_Builtin_Administrators,
 713                                  &token->user_sids, &token->num_sids);
 714         }
 715
 716         return NT_STATUS_OK;
 717 }
 718
 719 /*******************************************************************
 720 *******************************************************************/
 721
 722 static NTSTATUS create_builtin_users( void )
 723 {
 724         NTSTATUS status;
 725         DOM_SID dom_users;
 726
 727         status = pdb_create_builtin_alias( BUILTIN_ALIAS_RID_USERS );
 728         if ( !NT_STATUS_IS_OK(status) ) {
 729                 DEBUG(0,("create_builtin_users: Failed to create Users\n"));
 730                 return status;
 731         }
 732
 733         /* add domain users */
 734         if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
 735                 && secrets_fetch_domain_sid(lp_workgroup(), &dom_users))
 736         {
 737                 sid_append_rid(&dom_users, DOMAIN_GROUP_RID_USERS );
 738                 status = pdb_add_aliasmem( &global_sid_Builtin_Users, &dom_users);
 739                 if ( !NT_STATUS_IS_OK(status) ) {
 740                         DEBUG(0,("create_builtin_administrators: Failed to add Domain Users to"
 741                                 " Users\n"));
 742                         return status;
 743                 }
 744         }
 745
 746         return NT_STATUS_OK;
 747 }
 748
 749 /*******************************************************************
 750 *******************************************************************/
 751
 752 static NTSTATUS create_builtin_administrators( void )
 753 {
 754         NTSTATUS status;
 755         DOM_SID dom_admins, root_sid;
 756         fstring root_name;
 757         enum SID_NAME_USE type;
 758         TALLOC_CTX *ctx;
 759         BOOL ret;
 760
 761         status = pdb_create_builtin_alias( BUILTIN_ALIAS_RID_ADMINS );
 762         if ( !NT_STATUS_IS_OK(status) ) {
 763                 DEBUG(0,("create_builtin_administrators: Failed to create Administrators\n"));
 764                 return status;
 765         }
 766
 767         /* add domain admins */
 768         if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
 769                 && secrets_fetch_domain_sid(lp_workgroup(), &dom_admins))
 770         {
 771                 sid_append_rid(&dom_admins, DOMAIN_GROUP_RID_ADMINS);
 772                 status = pdb_add_aliasmem( &global_sid_Builtin_Administrators, &dom_admins );
 773                 if ( !NT_STATUS_IS_OK(status) ) {
 774                         DEBUG(0,("create_builtin_administrators: Failed to add Domain Admins"
 775                                 " Administrators\n"));
 776                         return status;
 777                 }
 778         }
 779
 780         /* add root */
 781         if ( (ctx = talloc_init(NULL)) == NULL ) {
 782                 return NT_STATUS_NO_MEMORY;
 783         }
 784         fstr_sprintf( root_name, "%s\\root", get_global_sam_name() );
 785         ret = lookup_name( ctx, root_name, 0, NULL, NULL, &root_sid, &type );
 786         TALLOC_FREE( ctx );
 787
 788         if ( ret ) {
 789                 status = pdb_add_aliasmem( &global_sid_Builtin_Administrators, &root_sid );
 790                 if ( !NT_STATUS_IS_OK(status) ) {
 791                         DEBUG(0,("create_builtin_administrators: Failed to add root"
 792                                 " Administrators\n"));
 793                         return status;
 794                 }
 795         }
 796
 797         return NT_STATUS_OK;
 798 }
 799
 800 /*******************************************************************
 801  Create a NT token for the user, expanding local aliases
 802 *******************************************************************/
 803
 804 static struct nt_user_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
 805                                                    const DOM_SID *user_sid,
 806                                                    const DOM_SID *group_sid,
 807                                                    BOOL is_guest,
 808                                                    int num_groupsids,
 809                                                    const DOM_SID *groupsids)
 810 {
 811         TALLOC_CTX *tmp_ctx;
 812         struct nt_user_token *result = NULL;
 813         int i;
 814         NTSTATUS status;
 815         gid_t gid;
 816
 817         tmp_ctx = talloc_new(mem_ctx);
 818         if (tmp_ctx == NULL) {
 819                 DEBUG(0, ("talloc_new failed\n"));
 820                 return NULL;
 821         }
 822
 823         result = TALLOC_ZERO_P(tmp_ctx, NT_USER_TOKEN);
 824         if (result == NULL) {
 825                 DEBUG(0, ("talloc failed\n"));
 826                 goto done;
 827         }
 828
 829         /* Add the user and primary group sid */
 830
 831         add_sid_to_array(result, user_sid,
 832                          &result->user_sids, &result->num_sids);
 833         add_sid_to_array(result, group_sid,
 834                          &result->user_sids, &result->num_sids);
 835
 836         /* Add in BUILTIN sids */
 837
 838         add_sid_to_array(result, &global_sid_World,
 839                          &result->user_sids, &result->num_sids);
 840         add_sid_to_array(result, &global_sid_Network,
 841                          &result->user_sids, &result->num_sids);
 842
 843         if (is_guest) {
 844                 add_sid_to_array(result, &global_sid_Builtin_Guests,
 845                                  &result->user_sids, &result->num_sids);
 846         } else {
 847                 add_sid_to_array(result, &global_sid_Authenticated_Users,
 848                                  &result->user_sids, &result->num_sids);
 849         }
 850
 851         /* Now the SIDs we got from authentication. These are the ones from
 852          * the info3 struct or from the pdb_enum_group_memberships, depending
 853          * on who authenticated the user. */
 854
 855         for (i=0; i<num_groupsids; i++) {
 856                 add_sid_to_array_unique(result, &groupsids[i],
 857                                         &result->user_sids, &result->num_sids);
 858         }
 859
 860         /* Deal with the BUILTIN\Administrators group.  If the SID can
 861            be resolved then assume that the add_aliasmem( S-1-5-32 )
 862            handled it. */
 863
 864         if ( !sid_to_gid( &global_sid_Builtin_Administrators, &gid ) ) {
 865                 /* We can only create a mapping if winbind is running
 866                    and the nested group functionality has been enabled */
 867
 868                 if ( lp_winbind_nested_groups() && winbind_ping() ) {
 869                         become_root();
 870                         status = create_builtin_administrators( );
 871                         if ( !NT_STATUS_IS_OK(status) ) {
 872                                 DEBUG(0,("create_local_nt_token: Failed to create BUILTIN\\Administrators group!\n"));
 873                                 /* don't fail, just log the message */
 874                         }
 875                         unbecome_root();
 876                 }
 877                 else {
 878                         status = add_builtin_administrators( tmp_ctx, result );
 879                         if ( !NT_STATUS_IS_OK(status) ) {
 880                                 /* just log a complaint but do not fail */
 881                                 DEBUG(3,("create_local_nt_token: failed to check for local Administrators"
 882                                         " membership (%s)\n", nt_errstr(status)));
 883                         }
 884                 }
 885         }
 886
 887         /* Deal with the BUILTIN\Users group.  If the SID can
 888            be resolved then assume that the add_aliasmem( S-1-5-32 )
 889            handled it. */
 890
 891         if ( !sid_to_gid( &global_sid_Builtin_Users, &gid ) ) {
 892                 /* We can only create a mapping if winbind is running
 893                    and the nested group functionality has been enabled */
 894
 895                 if ( lp_winbind_nested_groups() && winbind_ping() ) {
 896                         become_root();
 897                         status = create_builtin_users( );
 898                         if ( !NT_STATUS_IS_OK(status) ) {
 899                                 DEBUG(0,("create_local_nt_token: Failed to create BUILTIN\\Administrators group!\n"));
 900                                 /* don't fail, just log the message */
 901                         }
 902                         unbecome_root();
 903                 }
 904         }
 905
 906         /* Deal with local groups */
 907
 908         if (lp_winbind_nested_groups()) {
 909
 910                 /* Now add the aliases. First the one from our local SAM */
 911
 912                 status = add_aliases(tmp_ctx, get_global_sam_sid(), result);
 913
 914                 if (!NT_STATUS_IS_OK(status)) {
 915                         result = NULL;
 916                         goto done;
 917                 }
 918
 919                 /* Finally the builtin ones */
 920
 921                 status = add_aliases(tmp_ctx, &global_sid_Builtin, result);
 922
 923                 if (!NT_STATUS_IS_OK(status)) {
 924                         result = NULL;
 925                         goto done;
 926                 }
 927         }
 928
 929
 930         get_privileges_for_sids(&result->privileges, result->user_sids,
 931                                 result->num_sids);
 932
 933         talloc_steal(mem_ctx, result);
 934
 935  done:
 936         TALLOC_FREE(tmp_ctx);
 937         return result;
 938 }
 939
 940 /*
 941  * Create the token to use from server_info->sam_account and
 942  * server_info->sids (the info3/sam groups). Find the unix gids.
 943  */
 944
 945 NTSTATUS create_local_token(auth_serversupplied_info *server_info)
 946 {
 947         TALLOC_CTX *mem_ctx;
 948         NTSTATUS status;
 949         size_t i;
 950
 951
 952         mem_ctx = talloc_new(NULL);
 953         if (mem_ctx == NULL) {
 954                 DEBUG(0, ("talloc_new failed\n"));
 955                 return NT_STATUS_NO_MEMORY;
 956         }
 957
 958         if (server_info->was_mapped) {
 959                 status = create_token_from_username(server_info,
 960                                                     server_info->unix_name,
 961                                                     server_info->guest,
 962                                                     &server_info->uid,
 963                                                     &server_info->gid,
 964                                                     &server_info->unix_name,
 965                                                     &server_info->ptok);
 966
 967         } else {
 968                 server_info->ptok = create_local_nt_token(
 969                         server_info,
 970                         pdb_get_user_sid(server_info->sam_account),
 971                         pdb_get_group_sid(server_info->sam_account),
 972                         server_info->guest,
 973                         server_info->num_sids, server_info->sids);
 974                 status = server_info->ptok ?
 975                         NT_STATUS_OK : NT_STATUS_NO_SUCH_USER;
 976         }
 977
 978         if (!NT_STATUS_IS_OK(status)) {
 979                 TALLOC_FREE(mem_ctx);
 980                 return status;
 981         }
 982
 983         /* Convert the SIDs to gids. */
 984
 985         server_info->n_groups = 0;
 986         server_info->groups = NULL;
 987
 988         /* Start at index 1, where the groups start. */
 989
 990         for (i=1; i<server_info->ptok->num_sids; i++) {
 991                 gid_t gid;
 992                 DOM_SID *sid = &server_info->ptok->user_sids[i];
 993
 994                 if (!sid_to_gid(sid, &gid)) {
 995                         DEBUG(10, ("Could not convert SID %s to gid, "
 996                                    "ignoring it\n", sid_string_static(sid)));
 997                         continue;
 998                 }
 999                 add_gid_to_array_unique(server_info, gid, &server_info->groups,
1000                                         &server_info->n_groups);
1001         }
1002
1003         debug_nt_user_token(DBGC_AUTH, 10, server_info->ptok);
1004
1005         status = log_nt_token(mem_ctx, server_info->ptok);
1006
1007         TALLOC_FREE(mem_ctx);
1008         return status;
1009 }
1010
1011 /*
1012  * Create an artificial NT token given just a username. (Initially indended
1013  * for force user)
1014  *
1015  * We go through lookup_name() to avoid problems we had with 'winbind use
1016  * default domain'.
1017  *
1018  * We have 3 cases:
1019  *
1020  * unmapped unix users: Go directly to nss to find the user's group.
1021  *
1022  * A passdb user: The list of groups is provided by pdb_enum_group_memberships.
1023  *
1024  * If the user is provided by winbind, the primary gid is set to "domain
1025  * users" of the user's domain. For an explanation why this is necessary, see
1026  * the thread starting at
1027  * http://lists.samba.org/archive/samba-technical/2006-January/044803.html.
1028  */
1029
1030 NTSTATUS create_token_from_username(TALLOC_CTX *mem_ctx, const char *username,
1031                                     BOOL is_guest,
1032                                     uid_t *uid, gid_t *gid,
1033                                     char **found_username,
1034                                     struct nt_user_token **token)
1035 {
1036         NTSTATUS result = NT_STATUS_NO_SUCH_USER;
1037         TALLOC_CTX *tmp_ctx;
1038         DOM_SID user_sid;
1039         enum SID_NAME_USE type;
1040         gid_t *gids;
1041         DOM_SID primary_group_sid;
1042         DOM_SID *group_sids;
1043         size_t num_group_sids;
1044
1045         tmp_ctx = talloc_new(NULL);
1046         if (tmp_ctx == NULL) {
1047                 DEBUG(0, ("talloc_new failed\n"));
1048                 return NT_STATUS_NO_MEMORY;
1049         }
1050
1051         if (!lookup_name(tmp_ctx, username, LOOKUP_NAME_ALL,
1052                          NULL, NULL, &user_sid, &type)) {
1053                 DEBUG(1, ("lookup_name for %s failed\n", username));
1054                 goto done;
1055         }
1056
1057         if (type != SID_NAME_USER) {
1058                 DEBUG(1, ("%s is a %s, not a user\n", username,
1059                           sid_type_lookup(type)));
1060                 goto done;
1061         }
1062
1063         if (!sid_to_uid(&user_sid, uid)) {
1064                 DEBUG(1, ("sid_to_uid for %s (%s) failed\n",
1065                           username, sid_string_static(&user_sid)));
1066                 goto done;
1067         }
1068
1069         if (sid_check_is_in_unix_users(&user_sid)) {
1070
1071                 /* This is a unix user not in passdb. We need to ask nss
1072                  * directly, without consulting passdb */
1073
1074                 struct passwd *pass;
1075                 size_t i;
1076
1077                 pass = getpwuid_alloc(tmp_ctx, *uid);
1078                 if (pass == NULL) {
1079                         DEBUG(1, ("getpwuid(%d) for user %s failed\n",
1080                                   *uid, username));
1081                         goto done;
1082                 }
1083
1084                 *gid = pass->pw_gid;
1085                 gid_to_sid(&primary_group_sid, pass->pw_gid);
1086
1087                 if (!getgroups_unix_user(tmp_ctx, username, pass->pw_gid,
1088                                          &gids, &num_group_sids)) {
1089                         DEBUG(1, ("getgroups_unix_user for user %s failed\n",
1090                                   username));
1091                         goto done;
1092                 }
1093
1094                 group_sids = talloc_array(tmp_ctx, DOM_SID, num_group_sids);
1095                 if (group_sids == NULL) {
1096                         DEBUG(1, ("talloc_array failed\n"));
1097                         result = NT_STATUS_NO_MEMORY;
1098                         goto done;
1099                 }
1100
1101                 for (i=0; i<num_group_sids; i++) {
1102                         gid_to_sid(&group_sids[i], gids[i]);
1103                 }
1104                 *found_username = talloc_strdup(mem_ctx, pass->pw_name);
1105
1106         } else if (sid_check_is_in_our_domain(&user_sid)) {
1107
1108                 /* This is a passdb user, so ask passdb */
1109
1110                 struct samu *sam_acct = NULL;
1111                 const DOM_SID *gr_sid = NULL;
1112
1113                 if ( !(sam_acct = samu_new( tmp_ctx )) ) {
1114                         result = NT_STATUS_NO_MEMORY;
1115                         goto done;
1116                 }
1117
1118                 if (!pdb_getsampwsid(sam_acct, &user_sid)) {
1119                         DEBUG(1, ("pdb_getsampwsid(%s) for user %s failed\n",
1120                                   sid_string_static(&user_sid), username));
1121                         result = NT_STATUS_NO_SUCH_USER;
1122                         goto done;
1123                 }
1124
1125                 gr_sid = pdb_get_group_sid(sam_acct);
1126                 if (!gr_sid) {
1127                         result = NT_STATUS_NO_MEMORY;
1128                         goto done;
1129                 }
1130
1131                 sid_copy(&primary_group_sid, gr_sid);
1132
1133                 if (!sid_to_gid(&primary_group_sid, gid)) {
1134                         DEBUG(1, ("sid_to_gid(%s) failed\n",
1135                                   sid_string_static(&primary_group_sid)));
1136                         goto done;
1137                 }
1138
1139                 result = pdb_enum_group_memberships(tmp_ctx, sam_acct,
1140                                                     &group_sids, &gids,
1141                                                     &num_group_sids);
1142                 if (!NT_STATUS_IS_OK(result)) {
1143                         DEBUG(10, ("enum_group_memberships failed for %s\n",
1144                                    username));
1145                         goto done;
1146                 }
1147
1148                 *found_username = talloc_strdup(mem_ctx,
1149                                                 pdb_get_username(sam_acct));
1150
1151         } else {
1152
1153                 /* This user is from winbind, force the primary gid to the
1154                  * user's "domain users" group. Under certain circumstances
1155                  * (user comes from NT4), this might be a loss of
1156                  * information. But we can not rely on winbind getting the
1157                  * correct info. AD might prohibit winbind looking up that
1158                  * information. */
1159
1160                 uint32 dummy;
1161
1162                 sid_copy(&primary_group_sid, &user_sid);
1163                 sid_split_rid(&primary_group_sid, &dummy);
1164                 sid_append_rid(&primary_group_sid, DOMAIN_GROUP_RID_USERS);
1165
1166                 if (!sid_to_gid(&primary_group_sid, gid)) {
1167                         DEBUG(1, ("sid_to_gid(%s) failed\n",
1168                                   sid_string_static(&primary_group_sid)));
1169                         goto done;
1170                 }
1171
1172                 num_group_sids = 0;
1173                 group_sids = NULL;
1174
1175                 *found_username = talloc_strdup(mem_ctx, username);
1176         }
1177
1178         *token = create_local_nt_token(mem_ctx, &user_sid, &primary_group_sid,
1179                                        is_guest, num_group_sids, group_sids);
1180
1181         if ((*token == NULL) || (*found_username == NULL)) {
1182                 result = NT_STATUS_NO_MEMORY;
1183                 goto done;
1184         }
1185
1186         result = NT_STATUS_OK;
1187  done:
1188         TALLOC_FREE(tmp_ctx);
1189         return result;
1190 }
1191
1192 /***************************************************************************
1193  Build upon create_token_from_username:
1194
1195  Expensive helper function to figure out whether a user given its name is
1196  member of a particular group.
1197 ***************************************************************************/
1198 BOOL user_in_group_sid(const char *username, const DOM_SID *group_sid)
1199 {
1200         NTSTATUS status;
1201         uid_t uid;
1202         gid_t gid;
1203         char *found_username;
1204         struct nt_user_token *token;
1205         BOOL result;
1206
1207         TALLOC_CTX *mem_ctx;
1208
1209         mem_ctx = talloc_new(NULL);
1210         if (mem_ctx == NULL) {
1211                 DEBUG(0, ("talloc_new failed\n"));
1212                 return False;
1213         }
1214
1215         status = create_token_from_username(mem_ctx, username, False,
1216                                             &uid, &gid, &found_username,
1217                                             &token);
1218
1219         if (!NT_STATUS_IS_OK(status)) {
1220                 DEBUG(10, ("could not create token for %s\n", username));
1221                 return False;
1222         }
1223
1224         result = nt_token_check_sid(group_sid, token);
1225
1226         TALLOC_FREE(mem_ctx);
1227         return result;
1228
1229 }
1230
1231 BOOL user_in_group(const char *username, const char *groupname)
1232 {
1233         TALLOC_CTX *mem_ctx;
1234         DOM_SID group_sid;
1235         BOOL ret;
1236
1237         mem_ctx = talloc_new(NULL);
1238         if (mem_ctx == NULL) {
1239                 DEBUG(0, ("talloc_new failed\n"));
1240                 return False;
1241         }
1242
1243         ret = lookup_name(mem_ctx, groupname, LOOKUP_NAME_ALL,
1244                           NULL, NULL, &group_sid, NULL);
1245         TALLOC_FREE(mem_ctx);
1246
1247         if (!ret) {
1248                 DEBUG(10, ("lookup_name for (%s) failed.\n", groupname));
1249                 return False;
1250         }
1251
1252         return user_in_group_sid(username, &group_sid);
1253 }
1254
1255
1256 /***************************************************************************
1257  Make (and fill) a user_info struct from a 'struct passwd' by conversion
1258  to a struct samu
1259 ***************************************************************************/
1260
1261 NTSTATUS make_server_info_pw(auth_serversupplied_info **server_info,
1262                              char *unix_username,
1263                              struct passwd *pwd)
1264 {
1265         NTSTATUS status;
1266         struct samu *sampass = NULL;
1267         gid_t *gids;
1268         auth_serversupplied_info *result;
1269
1270         if ( !(sampass = samu_new( NULL )) ) {
1271                 return NT_STATUS_NO_MEMORY;
1272         }
1273
1274         status = samu_set_unix( sampass, pwd );
1275         if (!NT_STATUS_IS_OK(status)) {
1276                 return status;
1277         }
1278
1279         result = make_server_info(NULL);
1280         if (result == NULL) {
1281                 TALLOC_FREE(sampass);
1282                 return NT_STATUS_NO_MEMORY;
1283         }
1284
1285         result->sam_account = sampass;
1286         result->unix_name = talloc_strdup(result, unix_username);
1287         result->uid = pwd->pw_uid;
1288         result->gid = pwd->pw_gid;
1289
1290         status = pdb_enum_group_memberships(result, sampass,
1291                                             &result->sids, &gids,
1292                                             &result->num_sids);
1293
1294         if (!NT_STATUS_IS_OK(status)) {
1295                 DEBUG(10, ("pdb_enum_group_memberships failed: %s\n",
1296                            nt_errstr(status)));
1297                 TALLOC_FREE(result);
1298                 return status;
1299         }
1300
1301         /* For now we throw away the gids and convert via sid_to_gid
1302          * later. This needs fixing, but I'd like to get the code straight and
1303          * simple first. */
1304         TALLOC_FREE(gids);
1305
1306         *server_info = result;
1307
1308         return NT_STATUS_OK;
1309 }
1310
1311 /***************************************************************************
1312  Make (and fill) a user_info struct for a guest login.
1313  This *must* succeed for smbd to start. If there is no mapping entry for
1314  the guest gid, then create one.
1315 ***************************************************************************/
1316
1317 static NTSTATUS make_new_server_info_guest(auth_serversupplied_info **server_info)
1318 {
1319         NTSTATUS status;
1320         struct samu *sampass = NULL;
1321         DOM_SID guest_sid;
1322         BOOL ret;
1323         static const char zeros[16];
1324
1325         if ( !(sampass = samu_new( NULL )) ) {
1326                 return NT_STATUS_NO_MEMORY;
1327         }
1328
1329         sid_copy(&guest_sid, get_global_sam_sid());
1330         sid_append_rid(&guest_sid, DOMAIN_USER_RID_GUEST);
1331
1332         become_root();
1333         ret = pdb_getsampwsid(sampass, &guest_sid);
1334         unbecome_root();
1335
1336         if (!ret) {
1337                 TALLOC_FREE(sampass);
1338                 return NT_STATUS_NO_SUCH_USER;
1339         }
1340
1341         status = make_server_info_sam(server_info, sampass);
1342         if (!NT_STATUS_IS_OK(status)) {
1343                 TALLOC_FREE(sampass);
1344                 return status;
1345         }
1346
1347         (*server_info)->guest = True;
1348
1349         status = create_local_token(*server_info);
1350         if (!NT_STATUS_IS_OK(status)) {
1351                 DEBUG(10, ("create_local_token failed: %s\n",
1352                            nt_errstr(status)));
1353                 return status;
1354         }
1355
1356         /* annoying, but the Guest really does have a session key, and it is
1357            all zeros! */
1358         (*server_info)->user_session_key = data_blob(zeros, sizeof(zeros));
1359         (*server_info)->lm_session_key = data_blob(zeros, sizeof(zeros));
1360
1361         return NT_STATUS_OK;
1362 }
1363
1364 static auth_serversupplied_info *copy_serverinfo(auth_serversupplied_info *src)
1365 {
1366         auth_serversupplied_info *dst;
1367
1368         dst = make_server_info(NULL);
1369         if (dst == NULL) {
1370                 return NULL;
1371         }
1372
1373         dst->guest = src->guest;
1374         dst->uid = src->uid;
1375         dst->gid = src->gid;
1376         dst->n_groups = src->n_groups;
1377         if (src->n_groups != 0) {
1378                 dst->groups = talloc_memdup(dst, src->groups,
1379                                             sizeof(gid_t)*dst->n_groups);
1380         } else {
1381                 dst->groups = NULL;
1382         }
1383
1384         if (src->ptok) {
1385                 dst->ptok = dup_nt_token(dst, src->ptok);
1386                 if (!dst->ptok) {
1387                         TALLOC_FREE(dst);
1388                         return NULL;
1389                 }
1390         }
1391
1392         dst->user_session_key = data_blob_talloc( dst, src->user_session_key.data,
1393                                                 src->user_session_key.length);
1394
1395         dst->lm_session_key = data_blob_talloc(dst, src->lm_session_key.data,
1396                                                 src->lm_session_key.length);
1397
1398         dst->sam_account = samu_new(NULL);
1399         if (!dst->sam_account) {
1400                 TALLOC_FREE(dst);
1401                 return NULL;
1402         }
1403
1404         if (!pdb_copy_sam_account(dst->sam_account, src->sam_account)) {
1405                 TALLOC_FREE(dst);
1406                 return NULL;
1407         }
1408
1409         dst->pam_handle = NULL;
1410         dst->unix_name = talloc_strdup(dst, src->unix_name);
1411         if (!dst->unix_name) {
1412                 TALLOC_FREE(dst);
1413                 return NULL;
1414         }
1415
1416         return dst;
1417 }
1418
1419 static auth_serversupplied_info *guest_info = NULL;
1420
1421 BOOL init_guest_info(void)
1422 {
1423         if (guest_info != NULL)
1424                 return True;
1425
1426         return NT_STATUS_IS_OK(make_new_server_info_guest(&guest_info));
1427 }
1428
1429 NTSTATUS make_server_info_guest(auth_serversupplied_info **server_info)
1430 {
1431         *server_info = copy_serverinfo(guest_info);
1432         return (*server_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1433 }
1434
1435 /***************************************************************************
1436  Purely internal function for make_server_info_info3
1437  Fill the sam account from getpwnam
1438 ***************************************************************************/
1439 static NTSTATUS fill_sam_account(TALLOC_CTX *mem_ctx,
1440                                  const char *domain,
1441                                  const char *username,
1442                                  char **found_username,
1443                                  uid_t *uid, gid_t *gid,
1444                                  struct samu *account,
1445                                  BOOL *username_was_mapped)
1446 {
1447         NTSTATUS nt_status;
1448         fstring dom_user, lower_username;
1449         fstring real_username;
1450         struct passwd *passwd;
1451
1452         fstrcpy( lower_username, username );
1453         strlower_m( lower_username );
1454
1455         fstr_sprintf(dom_user, "%s%c%s", domain, *lp_winbind_separator(),
1456                 lower_username);
1457
1458         /* Get the passwd struct.  Try to create the account is necessary. */
1459
1460         *username_was_mapped = map_username( dom_user );
1461
1462         if ( !(passwd = smb_getpwnam( NULL, dom_user, real_username, True )) )
1463                 return NT_STATUS_NO_SUCH_USER;
1464
1465         *uid = passwd->pw_uid;
1466         *gid = passwd->pw_gid;
1467
1468         /* This is pointless -- there is no suport for differing
1469            unix and windows names.  Make sure to always store the
1470            one we actually looked up and succeeded. Have I mentioned
1471            why I hate the 'winbind use default domain' parameter?
1472                                          --jerry              */
1473
1474         *found_username = talloc_strdup( mem_ctx, real_username );
1475
1476         DEBUG(5,("fill_sam_account: located username was [%s]\n", *found_username));
1477
1478         nt_status = samu_set_unix( account, passwd );
1479
1480         TALLOC_FREE(passwd);
1481
1482         return nt_status;
1483 }
1484
1485 /****************************************************************************
1486  Wrapper to allow the getpwnam() call to strip the domain name and
1487  try again in case a local UNIX user is already there.  Also run through
1488  the username if we fallback to the username only.
1489  ****************************************************************************/
1490
1491 struct passwd *smb_getpwnam( TALLOC_CTX *mem_ctx, char *domuser,
1492                              fstring save_username, BOOL create )
1493 {
1494         struct passwd *pw = NULL;
1495         char *p;
1496         fstring username;
1497
1498         /* we only save a copy of the username it has been mangled
1499            by winbindd use default domain */
1500
1501         save_username[0] = '\0';
1502
1503         /* don't call map_username() here since it has to be done higher
1504            up the stack so we don't call it mutliple times */
1505
1506         fstrcpy( username, domuser );
1507
1508         p = strchr_m( username, *lp_winbind_separator() );
1509
1510         /* code for a DOMAIN\user string */
1511
1512         if ( p ) {
1513                 fstring strip_username;
1514
1515                 pw = Get_Pwnam_alloc( mem_ctx, domuser );
1516                 if ( pw ) {
1517                         /* make sure we get the case of the username correct */
1518                         /* work around 'winbind use default domain = yes' */
1519
1520                         if ( !strchr_m( pw->pw_name, *lp_winbind_separator() ) ) {
1521                                 char *domain;
1522
1523                                 /* split the domain and username into 2 strings */
1524                                 *p = '\0';
1525                                 domain = username;
1526
1527                                 fstr_sprintf(save_username, "%s%c%s", domain, *lp_winbind_separator(), pw->pw_name);
1528                         }
1529                         else
1530                                 fstrcpy( save_username, pw->pw_name );
1531
1532                         /* whew -- done! */
1533                         return pw;
1534                 }
1535
1536                 /* setup for lookup of just the username */
1537                 /* remember that p and username are overlapping memory */
1538
1539                 p++;
1540                 fstrcpy( strip_username, p );
1541                 fstrcpy( username, strip_username );
1542         }
1543
1544         /* just lookup a plain username */
1545
1546         pw = Get_Pwnam_alloc(mem_ctx, username);
1547
1548         /* Create local user if requested but only if winbindd
1549            is not running.  We need to protect against cases
1550            where winbindd is failing and then prematurely
1551            creating users in /etc/passwd */
1552
1553         if ( !pw && create && !winbind_ping() ) {
1554                 /* Don't add a machine account. */
1555                 if (username[strlen(username)-1] == '$')
1556                         return NULL;
1557
1558                 smb_create_user(NULL, username, NULL);
1559                 pw = Get_Pwnam_alloc(mem_ctx, username);
1560         }
1561
1562         /* one last check for a valid passwd struct */
1563
1564         if ( pw )
1565                 fstrcpy( save_username, pw->pw_name );
1566
1567         return pw;
1568 }
1569
1570 /***************************************************************************
1571  Make a server_info struct from the info3 returned by a domain logon
1572 ***************************************************************************/
1573
1574 NTSTATUS make_server_info_info3(TALLOC_CTX *mem_ctx,
1575                                 const char *sent_nt_username,
1576                                 const char *domain,
1577                                 auth_serversupplied_info **server_info,
1578                                 NET_USER_INFO_3 *info3)
1579 {
1580         static const char zeros[16];
1581
1582         NTSTATUS nt_status = NT_STATUS_OK;
1583         char *found_username;
1584         const char *nt_domain;
1585         const char *nt_username;
1586         struct samu *sam_account = NULL;
1587         DOM_SID user_sid;
1588         DOM_SID group_sid;
1589         BOOL username_was_mapped;
1590
1591         uid_t uid;
1592         gid_t gid;
1593
1594         size_t i;
1595
1596         auth_serversupplied_info *result;
1597
1598         /*
1599            Here is where we should check the list of
1600            trusted domains, and verify that the SID
1601            matches.
1602         */
1603
1604         sid_copy(&user_sid, &info3->dom_sid.sid);
1605         if (!sid_append_rid(&user_sid, info3->user_rid)) {
1606                 return NT_STATUS_INVALID_PARAMETER;
1607         }
1608
1609         sid_copy(&group_sid, &info3->dom_sid.sid);
1610         if (!sid_append_rid(&group_sid, info3->group_rid)) {
1611                 return NT_STATUS_INVALID_PARAMETER;
1612         }
1613
1614         if (!(nt_username = unistr2_tdup(mem_ctx, &(info3->uni_user_name)))) {
1615                 /* If the server didn't give us one, just use the one we sent
1616                  * them */
1617                 nt_username = sent_nt_username;
1618         }
1619
1620         if (!(nt_domain = unistr2_tdup(mem_ctx, &(info3->uni_logon_dom)))) {
1621                 /* If the server didn't give us one, just use the one we sent
1622                  * them */
1623                 nt_domain = domain;
1624         }
1625
1626         /* try to fill the SAM account..  If getpwnam() fails, then try the
1627            add user script (2.2.x behavior).
1628
1629            We use the _unmapped_ username here in an attempt to provide
1630            consistent username mapping behavior between kerberos and NTLM[SSP]
1631            authentication in domain mode security.  I.E. Username mapping
1632            should be applied to the fully qualified username
1633            (e.g. DOMAIN\user) and not just the login name.  Yes this means we
1634            called map_username() unnecessarily in make_user_info_map() but
1635            that is how the current code is designed.  Making the change here
1636            is the least disruptive place.  -- jerry */
1637
1638         if ( !(sam_account = samu_new( NULL )) ) {
1639                 return NT_STATUS_NO_MEMORY;
1640         }
1641
1642         /* this call will try to create the user if necessary */
1643
1644         nt_status = fill_sam_account(mem_ctx, nt_domain, sent_nt_username,
1645                                      &found_username, &uid, &gid, sam_account,
1646                                      &username_was_mapped);
1647
1648
1649         /* if we still don't have a valid unix account check for
1650           'map to guest = bad uid' */
1651
1652         if (!NT_STATUS_IS_OK(nt_status)) {
1653                 TALLOC_FREE( sam_account );
1654                 if ( lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_UID ) {
1655                         make_server_info_guest(server_info);
1656                         return NT_STATUS_OK;
1657                 }
1658                 return nt_status;
1659         }
1660
1661         if (!pdb_set_nt_username(sam_account, nt_username, PDB_CHANGED)) {
1662                 TALLOC_FREE(sam_account);
1663                 return NT_STATUS_NO_MEMORY;
1664         }
1665
1666         if (!pdb_set_username(sam_account, nt_username, PDB_CHANGED)) {
1667                 TALLOC_FREE(sam_account);
1668                 return NT_STATUS_NO_MEMORY;
1669         }
1670
1671         if (!pdb_set_domain(sam_account, nt_domain, PDB_CHANGED)) {
1672                 TALLOC_FREE(sam_account);
1673                 return NT_STATUS_NO_MEMORY;
1674         }
1675
1676         if (!pdb_set_user_sid(sam_account, &user_sid, PDB_CHANGED)) {
1677                 TALLOC_FREE(sam_account);
1678                 return NT_STATUS_UNSUCCESSFUL;
1679         }
1680
1681         if (!pdb_set_group_sid(sam_account, &group_sid, PDB_CHANGED)) {
1682                 TALLOC_FREE(sam_account);
1683                 return NT_STATUS_UNSUCCESSFUL;
1684         }
1685
1686         if (!pdb_set_fullname(sam_account,
1687                               unistr2_static(&(info3->uni_full_name)),
1688                               PDB_CHANGED)) {
1689                 TALLOC_FREE(sam_account);
1690                 return NT_STATUS_NO_MEMORY;
1691         }
1692
1693         if (!pdb_set_logon_script(sam_account,
1694                                   unistr2_static(&(info3->uni_logon_script)),
1695                                   PDB_CHANGED)) {
1696                 TALLOC_FREE(sam_account);
1697                 return NT_STATUS_NO_MEMORY;
1698         }
1699
1700         if (!pdb_set_profile_path(sam_account,
1701                                   unistr2_static(&(info3->uni_profile_path)),
1702                                   PDB_CHANGED)) {
1703                 TALLOC_FREE(sam_account);
1704                 return NT_STATUS_NO_MEMORY;
1705         }
1706
1707         if (!pdb_set_homedir(sam_account,
1708                              unistr2_static(&(info3->uni_home_dir)),
1709                              PDB_CHANGED)) {
1710                 TALLOC_FREE(sam_account);
1711                 return NT_STATUS_NO_MEMORY;
1712         }
1713
1714         if (!pdb_set_dir_drive(sam_account,
1715                                unistr2_static(&(info3->uni_dir_drive)),
1716                                PDB_CHANGED)) {
1717                 TALLOC_FREE(sam_account);
1718                 return NT_STATUS_NO_MEMORY;
1719         }
1720
1721         if (!pdb_set_acct_ctrl(sam_account, info3->acct_flags, PDB_CHANGED)) {
1722                 TALLOC_FREE(sam_account);
1723                 return NT_STATUS_NO_MEMORY;
1724         }
1725
1726         result = make_server_info(NULL);
1727         if (result == NULL) {
1728                 DEBUG(4, ("make_server_info failed!\n"));
1729                 TALLOC_FREE(sam_account);
1730                 return NT_STATUS_NO_MEMORY;
1731         }
1732
1733         /* save this here to _net_sam_logon() doesn't fail (it assumes a
1734            valid struct samu) */
1735
1736         result->sam_account = sam_account;
1737         result->unix_name = talloc_strdup(result, found_username);
1738
1739         /* Fill in the unix info we found on the way */
1740
1741         result->uid = uid;
1742         result->gid = gid;
1743
1744         /* Create a 'combined' list of all SIDs we might want in the SD */
1745
1746         result->num_sids = 0;
1747         result->sids = NULL;
1748
1749         /* and create (by appending rids) the 'domain' sids */
1750
1751         for (i = 0; i < info3->num_groups2; i++) {
1752                 DOM_SID sid;
1753                 if (!sid_compose(&sid, &info3->dom_sid.sid,
1754                                  info3->gids[i].g_rid)) {
1755                         DEBUG(3,("could not append additional group rid "
1756                                  "0x%x\n", info3->gids[i].g_rid));
1757                         TALLOC_FREE(result);
1758                         return NT_STATUS_INVALID_PARAMETER;
1759                 }
1760                 add_sid_to_array(result, &sid, &result->sids,
1761                                  &result->num_sids);
1762         }
1763
1764         /* Copy 'other' sids.  We need to do sid filtering here to
1765            prevent possible elevation of privileges.  See:
1766
1767            http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
1768          */
1769
1770         for (i = 0; i < info3->num_other_sids; i++) {
1771                 add_sid_to_array(result, &info3->other_sids[i].sid,
1772                                  &result->sids,
1773                                  &result->num_sids);
1774         }
1775
1776         result->login_server = unistr2_tdup(result,
1777                                             &(info3->uni_logon_srv));
1778
1779         /* ensure we are never given NULL session keys */
1780
1781         if (memcmp(info3->user_sess_key, zeros, sizeof(zeros)) == 0) {
1782                 result->user_session_key = data_blob(NULL, 0);
1783         } else {
1784                 result->user_session_key = data_blob_talloc(
1785                         result, info3->user_sess_key,
1786                         sizeof(info3->user_sess_key));
1787         }
1788
1789         if (memcmp(info3->lm_sess_key, zeros, 8) == 0) {
1790                 result->lm_session_key = data_blob(NULL, 0);
1791         } else {
1792                 result->lm_session_key = data_blob_talloc(
1793                         result, info3->lm_sess_key,
1794                         sizeof(info3->lm_sess_key));
1795         }
1796
1797         result->was_mapped = username_was_mapped;
1798
1799         *server_info = result;
1800
1801         return NT_STATUS_OK;
1802 }
1803
1804 /***************************************************************************
1805  Free a user_info struct
1806 ***************************************************************************/
1807
1808 void free_user_info(auth_usersupplied_info **user_info)
1809 {
1810         DEBUG(5,("attempting to free (and zero) a user_info structure\n"));
1811         if (*user_info != NULL) {
1812                 if ((*user_info)->smb_name) {
1813                         DEBUG(10,("structure was created for %s\n",
1814                                   (*user_info)->smb_name));
1815                 }
1816                 SAFE_FREE((*user_info)->smb_name);
1817                 SAFE_FREE((*user_info)->internal_username);
1818                 SAFE_FREE((*user_info)->client_domain);
1819                 SAFE_FREE((*user_info)->domain);
1820                 SAFE_FREE((*user_info)->wksta_name);
1821                 data_blob_free(&(*user_info)->lm_resp);
1822                 data_blob_free(&(*user_info)->nt_resp);
1823                 data_blob_clear_free(&(*user_info)->lm_interactive_pwd);
1824                 data_blob_clear_free(&(*user_info)->nt_interactive_pwd);
1825                 data_blob_clear_free(&(*user_info)->plaintext_password);
1826                 ZERO_STRUCT(**user_info);
1827         }
1828         SAFE_FREE(*user_info);
1829 }
1830
1831 /***************************************************************************
1832  Make an auth_methods struct
1833 ***************************************************************************/
1834
1835 BOOL make_auth_methods(struct auth_context *auth_context, auth_methods **auth_method)
1836 {
1837         if (!auth_context) {
1838                 smb_panic("no auth_context supplied to "
1839                           "make_auth_methods()!\n");
1840         }
1841
1842         if (!auth_method) {
1843                 smb_panic("make_auth_methods: pointer to auth_method pointer "
1844                           "is NULL!\n");
1845         }
1846
1847         *auth_method = TALLOC_P(auth_context->mem_ctx, auth_methods);
1848         if (!*auth_method) {
1849                 DEBUG(0,("make_auth_method: malloc failed!\n"));
1850                 return False;
1851         }
1852         ZERO_STRUCTP(*auth_method);
1853
1854         return True;
1855 }
1856
1857 /****************************************************************************
1858  Duplicate a SID token.
1859 ****************************************************************************/
1860
1861 NT_USER_TOKEN *dup_nt_token(TALLOC_CTX *mem_ctx, NT_USER_TOKEN *ptoken)
1862 {
1863         NT_USER_TOKEN *token;
1864
1865         if (!ptoken)
1866                 return NULL;
1867
1868         token = TALLOC_P(mem_ctx, NT_USER_TOKEN);
1869         if (token == NULL) {
1870                 DEBUG(0, ("talloc failed\n"));
1871                 return NULL;
1872         }
1873
1874         token->user_sids = talloc_memdup(token, ptoken->user_sids,
1875                                          sizeof(DOM_SID) * ptoken->num_sids );
1876
1877         if ((ptoken->user_sids != NULL) && (token->user_sids == NULL)) {
1878                 DEBUG(0, ("talloc_memdup failed\n"));
1879                 TALLOC_FREE(token);
1880                 return NULL;
1881         }
1882
1883         token->num_sids = ptoken->num_sids;
1884
1885         /* copy the privileges; don't consider failure to be critical here */
1886
1887         if ( !se_priv_copy( &token->privileges, &ptoken->privileges ) ) {
1888                 DEBUG(0,("dup_nt_token: Failure to copy SE_PRIV!.  "
1889                          "Continuing with 0 privileges assigned.\n"));
1890         }
1891
1892         return token;
1893 }
1894
1895 /****************************************************************************
1896  Check for a SID in an NT_USER_TOKEN
1897 ****************************************************************************/
1898
1899 BOOL nt_token_check_sid ( const DOM_SID *sid, const NT_USER_TOKEN *token )
1900 {
1901         int i;
1902
1903         if ( !sid || !token )
1904                 return False;
1905
1906         for ( i=0; i<token->num_sids; i++ ) {
1907                 if ( sid_equal( sid, &token->user_sids[i] ) )
1908                         return True;
1909         }
1910
1911         return False;
1912 }
1913
1914 BOOL nt_token_check_domain_rid( NT_USER_TOKEN *token, uint32 rid )
1915 {
1916         DOM_SID domain_sid;
1917
1918         /* if we are a domain member, the get the domain SID, else for
1919            a DC or standalone server, use our own SID */
1920
1921         if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
1922                 if ( !secrets_fetch_domain_sid( lp_workgroup(),
1923                                                 &domain_sid ) ) {
1924                         DEBUG(1,("nt_token_check_domain_rid: Cannot lookup "
1925                                  "SID for domain [%s]\n", lp_workgroup()));
1926                         return False;
1927                 }
1928         }
1929         else
1930                 sid_copy( &domain_sid, get_global_sam_sid() );
1931
1932         sid_append_rid( &domain_sid, rid );
1933
1934         return nt_token_check_sid( &domain_sid, token );\
1935 }
1936
1937 /**
1938  * Verify whether or not given domain is trusted.
1939  *
1940  * @param domain_name name of the domain to be verified
1941  * @return true if domain is one of the trusted once or
1942  *         false if otherwise
1943  **/
1944
1945 BOOL is_trusted_domain(const char* dom_name)
1946 {
1947         DOM_SID trustdom_sid;
1948         BOOL ret;
1949
1950         /* no trusted domains for a standalone server */
1951
1952         if ( lp_server_role() == ROLE_STANDALONE )
1953                 return False;
1954
1955         /* if we are a DC, then check for a direct trust relationships */
1956
1957         if ( IS_DC ) {
1958                 become_root();
1959                 DEBUG (5,("is_trusted_domain: Checking for domain trust with "
1960                           "[%s]\n", dom_name ));
1961                 ret = secrets_fetch_trusted_domain_password(dom_name, NULL,
1962                                                             NULL, NULL);
1963                 unbecome_root();
1964                 if (ret)
1965                         return True;
1966         }
1967         else {
1968                 NSS_STATUS result;
1969
1970                 /* If winbind is around, ask it */
1971
1972                 result = wb_is_trusted_domain(dom_name);
1973
1974                 if (result == NSS_STATUS_SUCCESS) {
1975                         return True;
1976                 }
1977
1978                 if (result == NSS_STATUS_NOTFOUND) {
1979                         /* winbind could not find the domain */
1980                         return False;
1981                 }
1982
1983                 /* The only other possible result is that winbind is not up
1984                    and running. We need to update the trustdom_cache
1985                    ourselves */
1986
1987                 update_trustdom_cache();
1988         }
1989
1990         /* now the trustdom cache should be available a DC could still
1991          * have a transitive trust so fall back to the cache of trusted
1992          * domains (like a domain member would use  */
1993
1994         if ( trustdom_cache_fetch(dom_name, &trustdom_sid) ) {
1995                 return True;
1996         }
1997
1998         return False;
1999 }
2000