source3/auth/token_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  *  Copyright (C) Michael Adam 2007
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 3 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25 /* functions moved from auth/auth_util.c to minimize linker deps */
  26
  27 #include "includes.h"
  28 #include "auth.h"
  29 #include "secrets.h"
  30 #include "memcache.h"
  31 #include "../librpc/gen_ndr/netlogon.h"
  32 #include "../libcli/security/security.h"
  33 #include "../lib/util/util_pw.h"
  34 #include "passdb.h"
  35 #include "lib/privileges.h"
  36
  37 /****************************************************************************
  38  Check for a SID in an struct security_token
  39 ****************************************************************************/
  40
  41 bool nt_token_check_sid ( const struct dom_sid *sid, const struct security_token *token )
  42 {
  43         if ( !sid || !token )
  44                 return False;
  45
  46         return security_token_has_sid(token, sid);
  47 }
  48
  49 bool nt_token_check_domain_rid( struct security_token *token, uint32 rid )
  50 {
  51         struct dom_sid domain_sid;
  52
  53         /* if we are a domain member, the get the domain SID, else for
  54            a DC or standalone server, use our own SID */
  55
  56         if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
  57                 if ( !secrets_fetch_domain_sid( lp_workgroup(),
  58                                                 &domain_sid ) ) {
  59                         DEBUG(1,("nt_token_check_domain_rid: Cannot lookup "
  60                                  "SID for domain [%s]\n", lp_workgroup()));
  61                         return False;
  62                 }
  63         }
  64         else
  65                 sid_copy( &domain_sid, get_global_sam_sid() );
  66
  67         sid_append_rid( &domain_sid, rid );
  68
  69         return nt_token_check_sid( &domain_sid, token );\
  70 }
  71
  72 /******************************************************************************
  73  Create a token for the root user to be used internally by smbd.
  74  This is similar to running under the context of the LOCAL_SYSTEM account
  75  in Windows.  This is a read-only token.  Do not modify it or free() it.
  76  Create a copy if you need to change it.
  77 ******************************************************************************/
  78
  79 struct security_token *get_root_nt_token( void )
  80 {
  81         struct security_token *token, *for_cache;
  82         struct dom_sid u_sid, g_sid;
  83         struct passwd *pw;
  84         void *cache_data;
  85
  86         cache_data = memcache_lookup_talloc(
  87                 NULL, SINGLETON_CACHE_TALLOC,
  88                 data_blob_string_const_null("root_nt_token"));
  89
  90         if (cache_data != NULL) {
  91                 return talloc_get_type_abort(
  92                         cache_data, struct security_token);
  93         }
  94
  95         if ( !(pw = sys_getpwuid(0)) ) {
  96                 if ( !(pw = sys_getpwnam("root")) ) {
  97                         DEBUG(0,("get_root_nt_token: both sys_getpwuid(0) "
  98                                 "and sys_getpwnam(\"root\") failed!\n"));
  99                         return NULL;
 100                 }
 101         }
 102
 103         /* get the user and primary group SIDs; although the
 104            BUILTIN\Administrators SId is really the one that matters here */
 105
 106         uid_to_sid(&u_sid, pw->pw_uid);
 107         gid_to_sid(&g_sid, pw->pw_gid);
 108
 109         token = create_local_nt_token(talloc_tos(), &u_sid, False,
 110                                       1, &global_sid_Builtin_Administrators);
 111
 112         security_token_set_privilege(token, SEC_PRIV_DISK_OPERATOR);
 113
 114         for_cache = token;
 115
 116         memcache_add_talloc(
 117                 NULL, SINGLETON_CACHE_TALLOC,
 118                 data_blob_string_const_null("root_nt_token"), &for_cache);
 119
 120         return token;
 121 }
 122
 123
 124 /*
 125  * Add alias SIDs from memberships within the partially created token SID list
 126  */
 127
 128 NTSTATUS add_aliases(const struct dom_sid *domain_sid,
 129                      struct security_token *token)
 130 {
 131         uint32 *aliases;
 132         size_t i, num_aliases;
 133         NTSTATUS status;
 134         TALLOC_CTX *tmp_ctx;
 135
 136         if (!(tmp_ctx = talloc_init("add_aliases"))) {
 137                 return NT_STATUS_NO_MEMORY;
 138         }
 139
 140         aliases = NULL;
 141         num_aliases = 0;
 142
 143         status = pdb_enum_alias_memberships(tmp_ctx, domain_sid,
 144                                             token->sids,
 145                                             token->num_sids,
 146                                             &aliases, &num_aliases);
 147
 148         if (!NT_STATUS_IS_OK(status)) {
 149                 DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n",
 150                            nt_errstr(status)));
 151                 goto done;
 152         }
 153
 154         for (i=0; i<num_aliases; i++) {
 155                 struct dom_sid alias_sid;
 156                 sid_compose(&alias_sid, domain_sid, aliases[i]);
 157                 status = add_sid_to_array_unique(token, &alias_sid,
 158                                                  &token->sids,
 159                                                  &token->num_sids);
 160                 if (!NT_STATUS_IS_OK(status)) {
 161                         DEBUG(0, ("add_sid_to_array failed\n"));
 162                         goto done;
 163                 }
 164         }
 165
 166 done:
 167         TALLOC_FREE(tmp_ctx);
 168         return NT_STATUS_OK;
 169 }
 170
 171 /*******************************************************************
 172 *******************************************************************/
 173
 174 static NTSTATUS add_builtin_administrators(struct security_token *token,
 175                                            const struct dom_sid *dom_sid)
 176 {
 177         struct dom_sid domadm;
 178         NTSTATUS status;
 179
 180         /* nothing to do if we aren't in a domain */
 181
 182         if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) {
 183                 return NT_STATUS_OK;
 184         }
 185
 186         /* Find the Domain Admins SID */
 187
 188         if ( IS_DC ) {
 189                 sid_copy( &domadm, get_global_sam_sid() );
 190         } else {
 191                 sid_copy(&domadm, dom_sid);
 192         }
 193         sid_append_rid( &domadm, DOMAIN_RID_ADMINS );
 194
 195         /* Add Administrators if the user beloongs to Domain Admins */
 196
 197         if ( nt_token_check_sid( &domadm, token ) ) {
 198                 status = add_sid_to_array(token,
 199                                           &global_sid_Builtin_Administrators,
 200                                           &token->sids, &token->num_sids);
 201         if (!NT_STATUS_IS_OK(status)) {
 202                         return status;
 203                 }
 204         }
 205
 206         return NT_STATUS_OK;
 207 }
 208
 209 static NTSTATUS finalize_local_nt_token(struct security_token *result,
 210                                         bool is_guest);
 211
 212 NTSTATUS create_local_nt_token_from_info3(TALLOC_CTX *mem_ctx,
 213                                           bool is_guest,
 214                                           struct netr_SamInfo3 *info3,
 215                                           struct extra_auth_info *extra,
 216                                           struct security_token **ntok)
 217 {
 218         struct security_token *usrtok = NULL;
 219         NTSTATUS status;
 220         int i;
 221
 222         DEBUG(10, ("Create local NT token for %s\n",
 223                    info3->base.account_name.string));
 224
 225         usrtok = talloc_zero(mem_ctx, struct security_token);
 226         if (!usrtok) {
 227                 DEBUG(0, ("talloc failed\n"));
 228                 return NT_STATUS_NO_MEMORY;
 229         }
 230
 231         /* Add the user and primary group sid FIRST */
 232         /* check if the user rid is the special "Domain Guests" rid.
 233          * If so pick the first sid for the extra sids instead as it
 234          * is a local fake account */
 235         usrtok->sids = talloc_array(usrtok, struct dom_sid, 2);
 236         if (!usrtok->sids) {
 237                 TALLOC_FREE(usrtok);
 238                 return NT_STATUS_NO_MEMORY;
 239         }
 240         usrtok->num_sids = 2;
 241
 242         /* USER SID */
 243         if (info3->base.rid == (uint32_t)(-1)) {
 244                 /* this is a signal the user was fake and generated,
 245                  * the actual SID we want to use is stored in the extra
 246                  * sids */
 247                 if (is_null_sid(&extra->user_sid)) {
 248                         /* we couldn't find the user sid, bail out */
 249                         DEBUG(3, ("Invalid user SID\n"));
 250                         TALLOC_FREE(usrtok);
 251                         return NT_STATUS_UNSUCCESSFUL;
 252                 }
 253                 sid_copy(&usrtok->sids[0], &extra->user_sid);
 254         } else {
 255                 sid_copy(&usrtok->sids[0], info3->base.domain_sid);
 256                 sid_append_rid(&usrtok->sids[0], info3->base.rid);
 257         }
 258
 259         /* GROUP SID */
 260         if (info3->base.primary_gid == (uint32_t)(-1)) {
 261                 /* this is a signal the user was fake and generated,
 262                  * the actual SID we want to use is stored in the extra
 263                  * sids */
 264                 if (is_null_sid(&extra->pgid_sid)) {
 265                         /* we couldn't find the user sid, bail out */
 266                         DEBUG(3, ("Invalid group SID\n"));
 267                         TALLOC_FREE(usrtok);
 268                         return NT_STATUS_UNSUCCESSFUL;
 269                 }
 270                 sid_copy(&usrtok->sids[1], &extra->pgid_sid);
 271         } else {
 272                 sid_copy(&usrtok->sids[1], info3->base.domain_sid);
 273                 sid_append_rid(&usrtok->sids[1],
 274                                 info3->base.primary_gid);
 275         }
 276
 277         /* Now the SIDs we got from authentication. These are the ones from
 278          * the info3 struct or from the pdb_enum_group_memberships, depending
 279          * on who authenticated the user.
 280          * Note that we start the for loop at "1" here, we already added the
 281          * first group sid as primary above. */
 282
 283         for (i = 0; i < info3->base.groups.count; i++) {
 284                 struct dom_sid tmp_sid;
 285
 286                 sid_copy(&tmp_sid, info3->base.domain_sid);
 287                 sid_append_rid(&tmp_sid, info3->base.groups.rids[i].rid);
 288
 289                 status = add_sid_to_array_unique(usrtok, &tmp_sid,
 290                                                  &usrtok->sids,
 291                                                  &usrtok->num_sids);
 292                 if (!NT_STATUS_IS_OK(status)) {
 293                         DEBUG(3, ("Failed to add SID to nt token\n"));
 294                         TALLOC_FREE(usrtok);
 295                         return status;
 296                 }
 297         }
 298
 299         /* now also add extra sids if they are not the special user/group
 300          * sids */
 301         for (i = 0; i < info3->sidcount; i++) {
 302                 status = add_sid_to_array_unique(usrtok,
 303                                                  info3->sids[i].sid,
 304                                                  &usrtok->sids,
 305                                                  &usrtok->num_sids);
 306                 if (!NT_STATUS_IS_OK(status)) {
 307                         DEBUG(3, ("Failed to add SID to nt token\n"));
 308                         TALLOC_FREE(usrtok);
 309                         return status;
 310                 }
 311         }
 312
 313         status = finalize_local_nt_token(usrtok, is_guest);
 314         if (!NT_STATUS_IS_OK(status)) {
 315                 DEBUG(3, ("Failed to finalize nt token\n"));
 316                 TALLOC_FREE(usrtok);
 317                 return status;
 318         }
 319
 320         *ntok = usrtok;
 321         return NT_STATUS_OK;
 322 }
 323
 324 /*******************************************************************
 325  Create a NT token for the user, expanding local aliases
 326 *******************************************************************/
 327
 328 struct security_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
 329                                             const struct dom_sid *user_sid,
 330                                             bool is_guest,
 331                                             int num_groupsids,
 332                                             const struct dom_sid *groupsids)
 333 {
 334         struct security_token *result = NULL;
 335         int i;
 336         NTSTATUS status;
 337
 338         DEBUG(10, ("Create local NT token for %s\n",
 339                    sid_string_dbg(user_sid)));
 340
 341         if (!(result = TALLOC_ZERO_P(mem_ctx, struct security_token))) {
 342                 DEBUG(0, ("talloc failed\n"));
 343                 return NULL;
 344         }
 345
 346         /* Add the user and primary group sid */
 347
 348         status = add_sid_to_array(result, user_sid,
 349                                   &result->sids, &result->num_sids);
 350         if (!NT_STATUS_IS_OK(status)) {
 351                 TALLOC_FREE(result);
 352                 return NULL;
 353         }
 354
 355         /* For guest, num_groupsids may be zero. */
 356         if (num_groupsids) {
 357                 status = add_sid_to_array(result, &groupsids[0],
 358                                           &result->sids,
 359                                           &result->num_sids);
 360                 if (!NT_STATUS_IS_OK(status)) {
 361                         TALLOC_FREE(result);
 362                         return NULL;
 363                 }
 364         }
 365
 366         /* Now the SIDs we got from authentication. These are the ones from
 367          * the info3 struct or from the pdb_enum_group_memberships, depending
 368          * on who authenticated the user.
 369          * Note that we start the for loop at "1" here, we already added the
 370          * first group sid as primary above. */
 371
 372         for (i=1; i<num_groupsids; i++) {
 373                 status = add_sid_to_array_unique(result, &groupsids[i],
 374                                                  &result->sids,
 375                                                  &result->num_sids);
 376                 if (!NT_STATUS_IS_OK(status)) {
 377                         TALLOC_FREE(result);
 378                         return NULL;
 379                 }
 380         }
 381
 382         status = finalize_local_nt_token(result, is_guest);
 383         if (!NT_STATUS_IS_OK(status)) {
 384                 TALLOC_FREE(result);
 385                 return NULL;
 386         }
 387
 388         return result;
 389 }
 390
 391 static NTSTATUS finalize_local_nt_token(struct security_token *result,
 392                                         bool is_guest)
 393 {
 394         struct dom_sid dom_sid;
 395         gid_t gid;
 396         NTSTATUS status;
 397
 398         /* Add in BUILTIN sids */
 399
 400         status = add_sid_to_array(result, &global_sid_World,
 401                                   &result->sids, &result->num_sids);
 402         if (!NT_STATUS_IS_OK(status)) {
 403                 return status;
 404         }
 405         status = add_sid_to_array(result, &global_sid_Network,
 406                                   &result->sids, &result->num_sids);
 407         if (!NT_STATUS_IS_OK(status)) {
 408                 return status;
 409         }
 410
 411         if (is_guest) {
 412                 status = add_sid_to_array(result, &global_sid_Builtin_Guests,
 413                                           &result->sids,
 414                                           &result->num_sids);
 415                 if (!NT_STATUS_IS_OK(status)) {
 416                         return status;
 417                 }
 418         } else {
 419                 status = add_sid_to_array(result,
 420                                           &global_sid_Authenticated_Users,
 421                                           &result->sids,
 422                                           &result->num_sids);
 423                 if (!NT_STATUS_IS_OK(status)) {
 424                         return status;
 425                 }
 426         }
 427
 428         /* Deal with the BUILTIN\Administrators group.  If the SID can
 429            be resolved then assume that the add_aliasmem( S-1-5-32 )
 430            handled it. */
 431
 432         if (!sid_to_gid(&global_sid_Builtin_Administrators, &gid)) {
 433
 434                 become_root();
 435                 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
 436                         status = NT_STATUS_OK;
 437                         DEBUG(3, ("Failed to fetch domain sid for %s\n",
 438                                   lp_workgroup()));
 439                 } else {
 440                         status = create_builtin_administrators(&dom_sid);
 441                 }
 442                 unbecome_root();
 443
 444                 if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) {
 445                         /* Add BUILTIN\Administrators directly to token. */
 446                         status = add_builtin_administrators(result, &dom_sid);
 447                         if ( !NT_STATUS_IS_OK(status) ) {
 448                                 DEBUG(3, ("Failed to check for local "
 449                                           "Administrators membership (%s)\n",
 450                                           nt_errstr(status)));
 451                         }
 452                 } else if (!NT_STATUS_IS_OK(status)) {
 453                         DEBUG(2, ("WARNING: Failed to create "
 454                                   "BUILTIN\\Administrators group!  Can "
 455                                   "Winbind allocate gids?\n"));
 456                 }
 457         }
 458
 459         /* Deal with the BUILTIN\Users group.  If the SID can
 460            be resolved then assume that the add_aliasmem( S-1-5-32 )
 461            handled it. */
 462
 463         if (!sid_to_gid(&global_sid_Builtin_Users, &gid)) {
 464
 465                 become_root();
 466                 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
 467                         status = NT_STATUS_OK;
 468                         DEBUG(3, ("Failed to fetch domain sid for %s\n",
 469                                   lp_workgroup()));
 470                 } else {
 471                         status = create_builtin_users(&dom_sid);
 472                 }
 473                 unbecome_root();
 474
 475                 if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) &&
 476                     !NT_STATUS_IS_OK(status))
 477                 {
 478                         DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! "
 479                                   "Can Winbind allocate gids?\n"));
 480                 }
 481         }
 482
 483         /* Deal with local groups */
 484
 485         if (lp_winbind_nested_groups()) {
 486
 487                 become_root();
 488
 489                 /* Now add the aliases. First the one from our local SAM */
 490
 491                 status = add_aliases(get_global_sam_sid(), result);
 492
 493                 if (!NT_STATUS_IS_OK(status)) {
 494                         unbecome_root();
 495                         return status;
 496                 }
 497
 498                 /* Finally the builtin ones */
 499
 500                 status = add_aliases(&global_sid_Builtin, result);
 501
 502                 if (!NT_STATUS_IS_OK(status)) {
 503                         unbecome_root();
 504                         return status;
 505                 }
 506
 507                 unbecome_root();
 508         }
 509
 510         /* Add privileges based on current user sids */
 511
 512         get_privileges_for_sids(&result->privilege_mask, result->sids,
 513                                 result->num_sids);
 514
 515         return NT_STATUS_OK;
 516 }
 517
 518 /****************************************************************************
 519  prints a UNIX 'token' to debug output.
 520 ****************************************************************************/
 521
 522 void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
 523                            int n_groups, gid_t *groups)
 524 {
 525         int     i;
 526         DEBUGC(dbg_class, dbg_lev,
 527                ("UNIX token of user %ld\n", (long int)uid));
 528
 529         DEBUGADDC(dbg_class, dbg_lev,
 530                   ("Primary group is %ld and contains %i supplementary "
 531                    "groups\n", (long int)gid, n_groups));
 532         for (i = 0; i < n_groups; i++)
 533                 DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
 534                         (long int)groups[i]));
 535 }
 536
 537 /*
 538  * Create an artificial NT token given just a username. (Initially intended
 539  * for force user)
 540  *
 541  * We go through lookup_name() to avoid problems we had with 'winbind use
 542  * default domain'.
 543  *
 544  * We have 3 cases:
 545  *
 546  * unmapped unix users: Go directly to nss to find the user's group.
 547  *
 548  * A passdb user: The list of groups is provided by pdb_enum_group_memberships.
 549  *
 550  * If the user is provided by winbind, the primary gid is set to "domain
 551  * users" of the user's domain. For an explanation why this is necessary, see
 552  * the thread starting at
 553  * http://lists.samba.org/archive/samba-technical/2006-January/044803.html.
 554  */
 555
 556 NTSTATUS create_token_from_username(TALLOC_CTX *mem_ctx, const char *username,
 557                                     bool is_guest,
 558                                     uid_t *uid, gid_t *gid,
 559                                     char **found_username,
 560                                     struct security_token **token)
 561 {
 562         NTSTATUS result = NT_STATUS_NO_SUCH_USER;
 563         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 564         struct dom_sid user_sid;
 565         enum lsa_SidType type;
 566         gid_t *gids;
 567         struct dom_sid *group_sids;
 568         struct dom_sid unix_group_sid;
 569         uint32_t num_group_sids;
 570         uint32_t num_gids;
 571         uint32_t i;
 572
 573         if (!lookup_name_smbconf(tmp_ctx, username, LOOKUP_NAME_ALL,
 574                          NULL, NULL, &user_sid, &type)) {
 575                 DEBUG(1, ("lookup_name_smbconf for %s failed\n", username));
 576                 goto done;
 577         }
 578
 579         if (type != SID_NAME_USER) {
 580                 DEBUG(1, ("%s is a %s, not a user\n", username,
 581                           sid_type_lookup(type)));
 582                 goto done;
 583         }
 584
 585         if (sid_check_is_in_our_domain(&user_sid)) {
 586                 bool ret;
 587                 uint32_t pdb_num_group_sids;
 588                 /* This is a passdb user, so ask passdb */
 589
 590                 struct samu *sam_acct = NULL;
 591
 592                 if ( !(sam_acct = samu_new( tmp_ctx )) ) {
 593                         result = NT_STATUS_NO_MEMORY;
 594                         goto done;
 595                 }
 596
 597                 become_root();
 598                 ret = pdb_getsampwsid(sam_acct, &user_sid);
 599                 unbecome_root();
 600
 601                 if (!ret) {
 602                         DEBUG(1, ("pdb_getsampwsid(%s) for user %s failed\n",
 603                                   sid_string_dbg(&user_sid), username));
 604                         DEBUGADD(1, ("Fall back to unix user %s\n", username));
 605                         goto unix_user;
 606                 }
 607
 608                 result = pdb_enum_group_memberships(tmp_ctx, sam_acct,
 609                                                     &group_sids, &gids,
 610                                                     &pdb_num_group_sids);
 611                 if (!NT_STATUS_IS_OK(result)) {
 612                         DEBUG(1, ("enum_group_memberships failed for %s (%s): "
 613                                   "%s\n", username, sid_string_dbg(&user_sid),
 614                                   nt_errstr(result)));
 615                         DEBUGADD(1, ("Fall back to unix user %s\n", username));
 616                         goto unix_user;
 617                 }
 618                 num_group_sids = pdb_num_group_sids;
 619
 620                 /* see the smb_panic() in pdb_default_enum_group_memberships */
 621                 SMB_ASSERT(num_group_sids > 0);
 622
 623                 *gid = gids[0];
 624
 625                 /* Ensure we're returning the found_username on the right context. */
 626                 *found_username = talloc_strdup(mem_ctx,
 627                                                 pdb_get_username(sam_acct));
 628
 629                 /*
 630                  * If the SID from lookup_name() was the guest sid, passdb knows
 631                  * about the mapping of guest sid to lp_guestaccount()
 632                  * username and will return the unix_pw info for a guest
 633                  * user. Use it if it's there, else lookup the *uid details
 634                  * using Get_Pwnam_alloc(). See bug #6291 for details. JRA.
 635                  */
 636
 637                 /* We must always assign the *uid. */
 638                 if (sam_acct->unix_pw == NULL) {
 639                         struct passwd *pwd = Get_Pwnam_alloc(sam_acct, *found_username );
 640                         if (!pwd) {
 641                                 DEBUG(10, ("Get_Pwnam_alloc failed for %s\n",
 642                                         *found_username));
 643                                 result = NT_STATUS_NO_SUCH_USER;
 644                                 goto done;
 645                         }
 646                         result = samu_set_unix(sam_acct, pwd );
 647                         if (!NT_STATUS_IS_OK(result)) {
 648                                 DEBUG(10, ("samu_set_unix failed for %s\n",
 649                                         *found_username));
 650                                 result = NT_STATUS_NO_SUCH_USER;
 651                                 goto done;
 652                         }
 653                 }
 654                 *uid = sam_acct->unix_pw->pw_uid;
 655
 656         } else  if (sid_check_is_in_unix_users(&user_sid)) {
 657                 uint32_t getgroups_num_group_sids;
 658                 /* This is a unix user not in passdb. We need to ask nss
 659                  * directly, without consulting passdb */
 660
 661                 struct passwd *pass;
 662
 663                 /*
 664                  * This goto target is used as a fallback for the passdb
 665                  * case. The concrete bug report is when passdb gave us an
 666                  * unmapped gid.
 667                  */
 668
 669         unix_user:
 670
 671                 if (!sid_to_uid(&user_sid, uid)) {
 672                         DEBUG(1, ("unix_user case, sid_to_uid for %s (%s) failed\n",
 673                                   username, sid_string_dbg(&user_sid)));
 674                         result = NT_STATUS_NO_SUCH_USER;
 675                         goto done;
 676                 }
 677
 678                 uid_to_unix_users_sid(*uid, &user_sid);
 679
 680                 pass = getpwuid_alloc(tmp_ctx, *uid);
 681                 if (pass == NULL) {
 682                         DEBUG(1, ("getpwuid(%u) for user %s failed\n",
 683                                   (unsigned int)*uid, username));
 684                         goto done;
 685                 }
 686
 687                 if (!getgroups_unix_user(tmp_ctx, username, pass->pw_gid,
 688                                          &gids, &getgroups_num_group_sids)) {
 689                         DEBUG(1, ("getgroups_unix_user for user %s failed\n",
 690                                   username));
 691                         goto done;
 692                 }
 693                 num_group_sids = getgroups_num_group_sids;
 694
 695                 if (num_group_sids) {
 696                         group_sids = TALLOC_ARRAY(tmp_ctx, struct dom_sid, num_group_sids);
 697                         if (group_sids == NULL) {
 698                                 DEBUG(1, ("TALLOC_ARRAY failed\n"));
 699                                 result = NT_STATUS_NO_MEMORY;
 700                                 goto done;
 701                         }
 702                 } else {
 703                         group_sids = NULL;
 704                 }
 705
 706                 for (i=0; i<num_group_sids; i++) {
 707                         gid_to_sid(&group_sids[i], gids[i]);
 708                 }
 709
 710                 /* In getgroups_unix_user we always set the primary gid */
 711                 SMB_ASSERT(num_group_sids > 0);
 712
 713                 *gid = gids[0];
 714
 715                 /* Ensure we're returning the found_username on the right context. */
 716                 *found_username = talloc_strdup(mem_ctx, pass->pw_name);
 717         } else {
 718
 719                 /* This user is from winbind, force the primary gid to the
 720                  * user's "domain users" group. Under certain circumstances
 721                  * (user comes from NT4), this might be a loss of
 722                  * information. But we can not rely on winbind getting the
 723                  * correct info. AD might prohibit winbind looking up that
 724                  * information. */
 725
 726                 /* We must always assign the *uid. */
 727                 if (!sid_to_uid(&user_sid, uid)) {
 728                         DEBUG(1, ("winbindd case, sid_to_uid for %s (%s) failed\n",
 729                                   username, sid_string_dbg(&user_sid)));
 730                         result = NT_STATUS_NO_SUCH_USER;
 731                         goto done;
 732                 }
 733
 734                 num_group_sids = 1;
 735                 group_sids = TALLOC_ARRAY(tmp_ctx, struct dom_sid, num_group_sids);
 736                 if (group_sids == NULL) {
 737                         DEBUG(1, ("TALLOC_ARRAY failed\n"));
 738                         result = NT_STATUS_NO_MEMORY;
 739                         goto done;
 740                 }
 741
 742                 sid_copy(&group_sids[0], &user_sid);
 743                 sid_split_rid(&group_sids[0], NULL);
 744                 sid_append_rid(&group_sids[0], DOMAIN_RID_USERS);
 745
 746                 if (!sid_to_gid(&group_sids[0], gid)) {
 747                         DEBUG(1, ("sid_to_gid(%s) failed\n",
 748                                   sid_string_dbg(&group_sids[0])));
 749                         goto done;
 750                 }
 751
 752                 gids = gid;
 753
 754                 /* Ensure we're returning the found_username on the right context. */
 755                 *found_username = talloc_strdup(mem_ctx, username);
 756         }
 757
 758         /* Add the "Unix Group" SID for each gid to catch mapped groups
 759            and their Unix equivalent.  This is to solve the backwards
 760            compatibility problem of 'valid users = +ntadmin' where
 761            ntadmin has been paired with "Domain Admins" in the group
 762            mapping table.  Otherwise smb.conf would need to be changed
 763            to 'valid user = "Domain Admins"'.  --jerry */
 764
 765         num_gids = num_group_sids;
 766         for ( i=0; i<num_gids; i++ ) {
 767                 gid_t high, low;
 768
 769                 /* don't pickup anything managed by Winbind */
 770
 771                 if ( lp_idmap_gid(&low, &high) && (gids[i] >= low) && (gids[i] <= high) )
 772                         continue;
 773
 774                 gid_to_unix_groups_sid(gids[i], &unix_group_sid);
 775
 776                 result = add_sid_to_array_unique(tmp_ctx, &unix_group_sid,
 777                                                  &group_sids, &num_group_sids);
 778                 if (!NT_STATUS_IS_OK(result)) {
 779                         goto done;
 780                 }
 781         }
 782
 783         /* Ensure we're creating the nt_token on the right context. */
 784         *token = create_local_nt_token(mem_ctx, &user_sid,
 785                                        is_guest, num_group_sids, group_sids);
 786
 787         if ((*token == NULL) || (*found_username == NULL)) {
 788                 result = NT_STATUS_NO_MEMORY;
 789                 goto done;
 790         }
 791
 792         result = NT_STATUS_OK;
 793  done:
 794         TALLOC_FREE(tmp_ctx);
 795         return result;
 796 }
 797
 798 /***************************************************************************
 799  Build upon create_token_from_username:
 800
 801  Expensive helper function to figure out whether a user given its name is
 802  member of a particular group.
 803 ***************************************************************************/
 804
 805 bool user_in_group_sid(const char *username, const struct dom_sid *group_sid)
 806 {
 807         NTSTATUS status;
 808         uid_t uid;
 809         gid_t gid;
 810         char *found_username;
 811         struct security_token *token;
 812         bool result;
 813         TALLOC_CTX *mem_ctx = talloc_stackframe();
 814
 815         status = create_token_from_username(mem_ctx, username, False,
 816                                             &uid, &gid, &found_username,
 817                                             &token);
 818
 819         if (!NT_STATUS_IS_OK(status)) {
 820                 DEBUG(10, ("could not create token for %s\n", username));
 821                 TALLOC_FREE(mem_ctx);
 822                 return False;
 823         }
 824
 825         result = security_token_has_sid(token, group_sid);
 826
 827         TALLOC_FREE(mem_ctx);
 828         return result;
 829 }
 830
 831 bool user_in_group(const char *username, const char *groupname)
 832 {
 833         TALLOC_CTX *mem_ctx = talloc_stackframe();
 834         struct dom_sid group_sid;
 835         bool ret;
 836
 837         ret = lookup_name(mem_ctx, groupname, LOOKUP_NAME_ALL,
 838                           NULL, NULL, &group_sid, NULL);
 839         TALLOC_FREE(mem_ctx);
 840
 841         if (!ret) {
 842                 DEBUG(10, ("lookup_name for (%s) failed.\n", groupname));
 843                 return False;
 844         }
 845
 846         return user_in_group_sid(username, &group_sid);
 847 }
 848
 849 /* END */