source/nsswitch/winbindd_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) Tim Potter 2000-2001
   7    Copyright (C) 2001 by Martin Pool <mbp@samba.org>
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25 #include "winbindd.h"
  26
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_WINBIND
  29
  30 /**
  31  * @file winbindd_util.c
  32  *
  33  * Winbind daemon for NT domain authentication nss module.
  34  **/
  35
  36
  37 /**
  38  * Used to clobber name fields that have an undefined value.
  39  *
  40  * Correct code should never look at a field that has this value.
  41  **/
  42
  43 static const fstring name_deadbeef = "<deadbeef>";
  44
  45 /* The list of trusted domains.  Note that the list can be deleted and
  46    recreated using the init_domain_list() function so pointers to
  47    individual winbindd_domain structures cannot be made.  Keep a copy of
  48    the domain name instead. */
  49
  50 static struct winbindd_domain *_domain_list;
  51
  52 /**
  53    When was the last scan of trusted domains done?
  54
  55    0 == not ever
  56 */
  57
  58 static time_t last_trustdom_scan;
  59
  60 struct winbindd_domain *domain_list(void)
  61 {
  62         /* Initialise list */
  63
  64         if ((!_domain_list) && (!init_domain_list())) {
  65                 smb_panic("Init_domain_list failed\n");
  66         }
  67
  68         return _domain_list;
  69 }
  70
  71 /* Free all entries in the trusted domain list */
  72
  73 void free_domain_list(void)
  74 {
  75         struct winbindd_domain *domain = _domain_list;
  76
  77         while(domain) {
  78                 struct winbindd_domain *next = domain->next;
  79
  80                 DLIST_REMOVE(_domain_list, domain);
  81                 SAFE_FREE(domain);
  82                 domain = next;
  83         }
  84 }
  85
  86 static BOOL is_internal_domain(const DOM_SID *sid)
  87 {
  88         if (sid == NULL)
  89                 return False;
  90
  91         return (sid_check_is_domain(sid) || sid_check_is_builtin(sid));
  92 }
  93
  94 static BOOL is_in_internal_domain(const DOM_SID *sid)
  95 {
  96         if (sid == NULL)
  97                 return False;
  98
  99         return (sid_check_is_in_our_domain(sid) || sid_check_is_in_builtin(sid));
 100 }
 101
 102
 103 /* Add a trusted domain to our list of domains */
 104 static struct winbindd_domain *add_trusted_domain(const char *domain_name, const char *alt_name,
 105                                                   struct winbindd_methods *methods,
 106                                                   const DOM_SID *sid)
 107 {
 108         struct winbindd_domain *domain;
 109         const char *alternative_name = NULL;
 110
 111         /* ignore alt_name if we are not in an AD domain */
 112
 113         if ( (lp_security() == SEC_ADS) && alt_name && *alt_name) {
 114                 alternative_name = alt_name;
 115         }
 116
 117         /* We can't call domain_list() as this function is called from
 118            init_domain_list() and we'll get stuck in a loop. */
 119         for (domain = _domain_list; domain; domain = domain->next) {
 120                 if (strequal(domain_name, domain->name) ||
 121                     strequal(domain_name, domain->alt_name)) {
 122                         return domain;
 123                 }
 124                 if (alternative_name && *alternative_name) {
 125                         if (strequal(alternative_name, domain->name) ||
 126                             strequal(alternative_name, domain->alt_name)) {
 127                                 return domain;
 128                         }
 129                 }
 130                 if (sid) {
 131                         if (is_null_sid(sid)) {
 132
 133                         } else if (sid_equal(sid, &domain->sid)) {
 134                                 return domain;
 135                         }
 136                 }
 137         }
 138
 139         /* Create new domain entry */
 140
 141         if ((domain = SMB_MALLOC_P(struct winbindd_domain)) == NULL)
 142                 return NULL;
 143
 144         /* Fill in fields */
 145
 146         ZERO_STRUCTP(domain);
 147
 148         /* prioritise the short name */
 149         if (strchr_m(domain_name, '.') && alternative_name && *alternative_name) {
 150                 fstrcpy(domain->name, alternative_name);
 151                 fstrcpy(domain->alt_name, domain_name);
 152         } else {
 153                 fstrcpy(domain->name, domain_name);
 154                 if (alternative_name) {
 155                         fstrcpy(domain->alt_name, alternative_name);
 156                 }
 157         }
 158
 159         domain->methods = methods;
 160         domain->backend = NULL;
 161         domain->internal = is_internal_domain(sid);
 162         domain->sequence_number = DOM_SEQUENCE_NONE;
 163         domain->last_seq_check = 0;
 164         domain->initialized = False;
 165         domain->online = False;
 166         if (sid) {
 167                 sid_copy(&domain->sid, sid);
 168         }
 169
 170         /* Link to domain list */
 171         DLIST_ADD(_domain_list, domain);
 172
 173         DEBUG(2,("Added domain %s %s %s\n",
 174                  domain->name, domain->alt_name,
 175                  &domain->sid?sid_string_static(&domain->sid):""));
 176
 177         return domain;
 178 }
 179
 180 /********************************************************************
 181   rescan our domains looking for new trusted domains
 182 ********************************************************************/
 183
 184 struct trustdom_state {
 185         TALLOC_CTX *mem_ctx;
 186         struct winbindd_response *response;
 187 };
 188
 189 static void trustdom_recv(void *private_data, BOOL success);
 190
 191 static void add_trusted_domains( struct winbindd_domain *domain )
 192 {
 193         TALLOC_CTX *mem_ctx;
 194         struct winbindd_request *request;
 195         struct winbindd_response *response;
 196
 197         struct trustdom_state *state;
 198
 199         mem_ctx = talloc_init("add_trusted_domains");
 200         if (mem_ctx == NULL) {
 201                 DEBUG(0, ("talloc_init failed\n"));
 202                 return;
 203         }
 204
 205         request = TALLOC_ZERO_P(mem_ctx, struct winbindd_request);
 206         response = TALLOC_P(mem_ctx, struct winbindd_response);
 207         state = TALLOC_P(mem_ctx, struct trustdom_state);
 208
 209         if ((request == NULL) || (response == NULL) || (state == NULL)) {
 210                 DEBUG(0, ("talloc failed\n"));
 211                 talloc_destroy(mem_ctx);
 212                 return;
 213         }
 214
 215         state->mem_ctx = mem_ctx;
 216         state->response = response;
 217
 218         request->length = sizeof(*request);
 219         request->cmd = WINBINDD_LIST_TRUSTDOM;
 220
 221         async_domain_request(mem_ctx, domain, request, response,
 222                              trustdom_recv, state);
 223 }
 224
 225 static void trustdom_recv(void *private_data, BOOL success)
 226 {
 227         extern struct winbindd_methods cache_methods;
 228         struct trustdom_state *state =
 229                 talloc_get_type_abort(private_data, struct trustdom_state);
 230         struct winbindd_response *response = state->response;
 231         char *p;
 232
 233         if ((!success) || (response->result != WINBINDD_OK)) {
 234                 DEBUG(1, ("Could not receive trustdoms\n"));
 235                 talloc_destroy(state->mem_ctx);
 236                 return;
 237         }
 238
 239         p = response->extra_data.data;
 240
 241         while ((p != NULL) && (*p != '\0')) {
 242                 char *q, *sidstr, *alt_name;
 243                 DOM_SID sid;
 244
 245                 alt_name = strchr(p, '\\');
 246                 if (alt_name == NULL) {
 247                         DEBUG(0, ("Got invalid trustdom response\n"));
 248                         break;
 249                 }
 250
 251                 *alt_name = '\0';
 252                 alt_name += 1;
 253
 254                 sidstr = strchr(alt_name, '\\');
 255                 if (sidstr == NULL) {
 256                         DEBUG(0, ("Got invalid trustdom response\n"));
 257                         break;
 258                 }
 259
 260                 *sidstr = '\0';
 261                 sidstr += 1;
 262
 263                 q = strchr(sidstr, '\n');
 264                 if (q != NULL)
 265                         *q = '\0';
 266
 267                 if (!string_to_sid(&sid, sidstr)) {
 268                         DEBUG(0, ("Got invalid trustdom response\n"));
 269                         break;
 270                 }
 271
 272                 if (find_domain_from_name_noinit(p) == NULL) {
 273                         struct winbindd_domain *domain;
 274                         char *alternate_name = NULL;
 275
 276                         /* use the real alt_name if we have one, else pass in NULL */
 277
 278                         if ( !strequal( alt_name, "(null)" ) )
 279                                 alternate_name = alt_name;
 280
 281                         domain = add_trusted_domain(p, alternate_name,
 282                                                     &cache_methods,
 283                                                     &sid);
 284                         setup_domain_child(domain, &domain->child, NULL);
 285                 }
 286                 p=q;
 287                 if (p != NULL)
 288                         p += 1;
 289         }
 290
 291         SAFE_FREE(response->extra_data.data);
 292         talloc_destroy(state->mem_ctx);
 293 }
 294
 295 /********************************************************************
 296  Periodically we need to refresh the trusted domain cache for smbd
 297 ********************************************************************/
 298
 299 void rescan_trusted_domains( void )
 300 {
 301         time_t now = time(NULL);
 302
 303         /* see if the time has come... */
 304
 305         if ((now >= last_trustdom_scan) &&
 306             ((now-last_trustdom_scan) < WINBINDD_RESCAN_FREQ) )
 307                 return;
 308
 309         /* this will only add new domains we didn't already know about */
 310
 311         add_trusted_domains( find_our_domain() );
 312
 313         last_trustdom_scan = now;
 314
 315         return;
 316 }
 317
 318 struct init_child_state {
 319         TALLOC_CTX *mem_ctx;
 320         struct winbindd_domain *domain;
 321         struct winbindd_request *request;
 322         struct winbindd_response *response;
 323         void (*continuation)(void *private_data, BOOL success);
 324         void *private_data;
 325 };
 326
 327 static void init_child_recv(void *private_data, BOOL success);
 328 static void init_child_getdc_recv(void *private_data, BOOL success);
 329
 330 enum winbindd_result init_child_connection(struct winbindd_domain *domain,
 331                                            void (*continuation)(void *private_data,
 332                                                                 BOOL success),
 333                                            void *private_data)
 334 {
 335         TALLOC_CTX *mem_ctx;
 336         struct winbindd_request *request;
 337         struct winbindd_response *response;
 338         struct init_child_state *state;
 339         struct winbindd_domain *request_domain;
 340
 341         mem_ctx = talloc_init("init_child_connection");
 342         if (mem_ctx == NULL) {
 343                 DEBUG(0, ("talloc_init failed\n"));
 344                 return WINBINDD_ERROR;
 345         }
 346
 347         request = TALLOC_ZERO_P(mem_ctx, struct winbindd_request);
 348         response = TALLOC_P(mem_ctx, struct winbindd_response);
 349         state = TALLOC_P(mem_ctx, struct init_child_state);
 350
 351         if ((request == NULL) || (response == NULL) || (state == NULL)) {
 352                 DEBUG(0, ("talloc failed\n"));
 353                 continuation(private_data, False);
 354                 return WINBINDD_ERROR;
 355         }
 356
 357         request->length = sizeof(*request);
 358
 359         state->mem_ctx = mem_ctx;
 360         state->domain = domain;
 361         state->request = request;
 362         state->response = response;
 363         state->continuation = continuation;
 364         state->private_data = private_data;
 365
 366         if (domain->primary) {
 367                 /* The primary domain has to find the DC name itself */
 368                 request->cmd = WINBINDD_INIT_CONNECTION;
 369                 fstrcpy(request->domain_name, domain->name);
 370                 request->data.init_conn.is_primary = True;
 371                 fstrcpy(request->data.init_conn.dcname, "");
 372                 async_request(mem_ctx, &domain->child, request, response,
 373                               init_child_recv, state);
 374                 return WINBINDD_PENDING;
 375         }
 376
 377         /* This is *not* the primary domain, let's ask our DC about a DC
 378          * name */
 379
 380         request->cmd = WINBINDD_GETDCNAME;
 381         fstrcpy(request->domain_name, domain->name);
 382
 383         /* save online flag */
 384         request_domain = find_our_domain();
 385         request_domain->online = domain->online;
 386
 387         async_domain_request(mem_ctx, request_domain, request, response,
 388                              init_child_getdc_recv, state);
 389         return WINBINDD_PENDING;
 390 }
 391
 392 static void init_child_getdc_recv(void *private_data, BOOL success)
 393 {
 394         struct init_child_state *state =
 395                 talloc_get_type_abort(private_data, struct init_child_state);
 396         const char *dcname = "";
 397
 398         DEBUG(10, ("Received getdcname response\n"));
 399
 400         if (success && (state->response->result == WINBINDD_OK)) {
 401                 dcname = state->response->data.dc_name;
 402         }
 403
 404         state->request->cmd = WINBINDD_INIT_CONNECTION;
 405         fstrcpy(state->request->domain_name, state->domain->name);
 406         state->request->data.init_conn.is_primary = False;
 407         fstrcpy(state->request->data.init_conn.dcname, dcname);
 408
 409         async_request(state->mem_ctx, &state->domain->child,
 410                       state->request, state->response,
 411                       init_child_recv, state);
 412 }
 413
 414 static void init_child_recv(void *private_data, BOOL success)
 415 {
 416         struct init_child_state *state =
 417                 talloc_get_type_abort(private_data, struct init_child_state);
 418
 419         DEBUG(5, ("Received child initialization response for domain %s\n",
 420                   state->domain->name));
 421
 422         if ((!success) || (state->response->result != WINBINDD_OK)) {
 423                 DEBUG(3, ("Could not init child\n"));
 424                 state->continuation(state->private_data, False);
 425                 talloc_destroy(state->mem_ctx);
 426                 return;
 427         }
 428
 429         fstrcpy(state->domain->name,
 430                 state->response->data.domain_info.name);
 431         fstrcpy(state->domain->alt_name,
 432                 state->response->data.domain_info.alt_name);
 433         string_to_sid(&state->domain->sid,
 434                       state->response->data.domain_info.sid);
 435         state->domain->native_mode =
 436                 state->response->data.domain_info.native_mode;
 437         state->domain->active_directory =
 438                 state->response->data.domain_info.active_directory;
 439         state->domain->sequence_number =
 440                 state->response->data.domain_info.sequence_number;
 441
 442         state->domain->initialized = 1;
 443
 444         if (state->continuation != NULL)
 445                 state->continuation(state->private_data, True);
 446         talloc_destroy(state->mem_ctx);
 447 }
 448
 449 enum winbindd_result winbindd_dual_init_connection(struct winbindd_domain *domain,
 450                                                    struct winbindd_cli_state *state)
 451 {
 452         struct in_addr ipaddr;
 453
 454         /* Ensure null termination */
 455         state->request.domain_name
 456                 [sizeof(state->request.domain_name)-1]='\0';
 457         state->request.data.init_conn.dcname
 458                 [sizeof(state->request.data.init_conn.dcname)-1]='\0';
 459
 460         if (strlen(state->request.data.init_conn.dcname) > 0) {
 461                 fstrcpy(domain->dcname, state->request.data.init_conn.dcname);
 462         }
 463
 464         if (strlen(domain->dcname) > 0) {
 465                 if (!resolve_name(domain->dcname, &ipaddr, 0x20)) {
 466                         DEBUG(2, ("Could not resolve DC name %s for domain %s\n",
 467                                   domain->dcname, domain->name));
 468                         return WINBINDD_ERROR;
 469                 }
 470
 471                 domain->dcaddr.sin_family = PF_INET;
 472                 putip((char *)&(domain->dcaddr.sin_addr), (char *)&ipaddr);
 473                 domain->dcaddr.sin_port = 0;
 474         }
 475
 476         set_dc_type_and_flags(domain);
 477
 478         if (!domain->initialized) {
 479                 DEBUG(1, ("Could not initialize domain %s\n",
 480                           state->request.domain_name));
 481                 return WINBINDD_ERROR;
 482         }
 483
 484         fstrcpy(state->response.data.domain_info.name, domain->name);
 485         fstrcpy(state->response.data.domain_info.alt_name, domain->alt_name);
 486         fstrcpy(state->response.data.domain_info.sid,
 487                 sid_string_static(&domain->sid));
 488
 489         state->response.data.domain_info.native_mode
 490                 = domain->native_mode;
 491         state->response.data.domain_info.active_directory
 492                 = domain->active_directory;
 493         state->response.data.domain_info.primary
 494                 = domain->primary;
 495         state->response.data.domain_info.sequence_number =
 496                 domain->sequence_number;
 497
 498         return WINBINDD_OK;
 499 }
 500
 501 /* Look up global info for the winbind daemon */
 502 BOOL init_domain_list(void)
 503 {
 504         extern struct winbindd_methods cache_methods;
 505         extern struct winbindd_methods passdb_methods;
 506         struct winbindd_domain *domain;
 507         int role = lp_server_role();
 508
 509         /* Free existing list */
 510         free_domain_list();
 511
 512         /* Add ourselves as the first entry. */
 513
 514         if ( role == ROLE_DOMAIN_MEMBER ) {
 515                 DOM_SID our_sid;
 516
 517                 if (!secrets_fetch_domain_sid(lp_workgroup(), &our_sid)) {
 518                         DEBUG(0, ("Could not fetch our SID - did we join?\n"));
 519                         return False;
 520                 }
 521
 522                 domain = add_trusted_domain( lp_workgroup(), lp_realm(),
 523                                              &cache_methods, &our_sid);
 524                 domain->primary = True;
 525                 setup_domain_child(domain, &domain->child, NULL);
 526         }
 527
 528         /* Local SAM */
 529
 530         domain = add_trusted_domain(get_global_sam_name(), NULL,
 531                                     &passdb_methods, get_global_sam_sid());
 532         if ( role != ROLE_DOMAIN_MEMBER ) {
 533                 domain->primary = True;
 534         }
 535         setup_domain_child(domain, &domain->child, NULL);
 536
 537         /* BUILTIN domain */
 538
 539         domain = add_trusted_domain("BUILTIN", NULL, &passdb_methods,
 540                                     &global_sid_Builtin);
 541         setup_domain_child(domain, &domain->child, NULL);
 542
 543         return True;
 544 }
 545
 546 /**
 547  * Given a domain name, return the struct winbindd domain info for it
 548  *
 549  * @note Do *not* pass lp_workgroup() to this function.  domain_list
 550  *       may modify it's value, and free that pointer.  Instead, our local
 551  *       domain may be found by calling find_our_domain().
 552  *       directly.
 553  *
 554  *
 555  * @return The domain structure for the named domain, if it is working.
 556  */
 557
 558 struct winbindd_domain *find_domain_from_name_noinit(const char *domain_name)
 559 {
 560         struct winbindd_domain *domain;
 561
 562         /* Search through list */
 563
 564         for (domain = domain_list(); domain != NULL; domain = domain->next) {
 565                 if (strequal(domain_name, domain->name) ||
 566                     (domain->alt_name[0] &&
 567                      strequal(domain_name, domain->alt_name))) {
 568                         return domain;
 569                 }
 570         }
 571
 572         /* Not found */
 573
 574         return NULL;
 575 }
 576
 577 struct winbindd_domain *find_domain_from_name(const char *domain_name)
 578 {
 579         struct winbindd_domain *domain;
 580
 581         domain = find_domain_from_name_noinit(domain_name);
 582
 583         if (domain == NULL)
 584                 return NULL;
 585
 586         if (!domain->initialized)
 587                 set_dc_type_and_flags(domain);
 588
 589         return domain;
 590 }
 591
 592 /* Given a domain sid, return the struct winbindd domain info for it */
 593
 594 struct winbindd_domain *find_domain_from_sid_noinit(const DOM_SID *sid)
 595 {
 596         struct winbindd_domain *domain;
 597
 598         /* Search through list */
 599
 600         for (domain = domain_list(); domain != NULL; domain = domain->next) {
 601                 if (sid_compare_domain(sid, &domain->sid) == 0)
 602                         return domain;
 603         }
 604
 605         /* Not found */
 606
 607         return NULL;
 608 }
 609
 610 /* Given a domain sid, return the struct winbindd domain info for it */
 611
 612 struct winbindd_domain *find_domain_from_sid(const DOM_SID *sid)
 613 {
 614         struct winbindd_domain *domain;
 615
 616         domain = find_domain_from_sid_noinit(sid);
 617
 618         if (domain == NULL)
 619                 return NULL;
 620
 621         if (!domain->initialized)
 622                 set_dc_type_and_flags(domain);
 623
 624         return domain;
 625 }
 626
 627 struct winbindd_domain *find_our_domain(void)
 628 {
 629         struct winbindd_domain *domain;
 630
 631         /* Search through list */
 632
 633         for (domain = domain_list(); domain != NULL; domain = domain->next) {
 634                 if (domain->primary)
 635                         return domain;
 636         }
 637
 638         smb_panic("Could not find our domain\n");
 639         return NULL;
 640 }
 641
 642 struct winbindd_domain *find_builtin_domain(void)
 643 {
 644         DOM_SID sid;
 645         struct winbindd_domain *domain;
 646
 647         string_to_sid(&sid, "S-1-5-32");
 648         domain = find_domain_from_sid(&sid);
 649
 650         if (domain == NULL)
 651                 smb_panic("Could not find BUILTIN domain\n");
 652
 653         return domain;
 654 }
 655
 656 /* Find the appropriate domain to lookup a name or SID */
 657
 658 struct winbindd_domain *find_lookup_domain_from_sid(const DOM_SID *sid)
 659 {
 660         /* A DC can't ask the local smbd for remote SIDs, here winbindd is the
 661          * one to contact the external DC's. On member servers the internal
 662          * domains are different: These are part of the local SAM. */
 663
 664         DEBUG(10, ("find_lookup_domain_from_sid(%s)\n",
 665                    sid_string_static(sid)));
 666
 667         if (IS_DC || is_internal_domain(sid) || is_in_internal_domain(sid)) {
 668                 DEBUG(10, ("calling find_domain_from_sid\n"));
 669                 return find_domain_from_sid(sid);
 670         }
 671
 672         /* On a member server a query for SID or name can always go to our
 673          * primary DC. */
 674
 675         DEBUG(10, ("calling find_our_domain\n"));
 676         return find_our_domain();
 677 }
 678
 679 struct winbindd_domain *find_lookup_domain_from_name(const char *domain_name)
 680 {
 681         if (IS_DC || strequal(domain_name, "BUILTIN") ||
 682             strequal(domain_name, get_global_sam_name()))
 683                 return find_domain_from_name_noinit(domain_name);
 684
 685         return find_our_domain();
 686 }
 687
 688 /* Lookup a sid in a domain from a name */
 689
 690 BOOL winbindd_lookup_sid_by_name(TALLOC_CTX *mem_ctx,
 691                                  struct winbindd_domain *domain,
 692                                  const char *domain_name,
 693                                  const char *name, DOM_SID *sid,
 694                                  enum SID_NAME_USE *type)
 695 {
 696         NTSTATUS result;
 697
 698         /* Lookup name */
 699         result = domain->methods->name_to_sid(domain, mem_ctx, domain_name, name, sid, type);
 700
 701         /* Return rid and type if lookup successful */
 702         if (!NT_STATUS_IS_OK(result)) {
 703                 *type = SID_NAME_UNKNOWN;
 704         }
 705
 706         return NT_STATUS_IS_OK(result);
 707 }
 708
 709 /**
 710  * @brief Lookup a name in a domain from a sid.
 711  *
 712  * @param sid Security ID you want to look up.
 713  * @param name On success, set to the name corresponding to @p sid.
 714  * @param dom_name On success, set to the 'domain name' corresponding to @p sid.
 715  * @param type On success, contains the type of name: alias, group or
 716  * user.
 717  * @retval True if the name exists, in which case @p name and @p type
 718  * are set, otherwise False.
 719  **/
 720 BOOL winbindd_lookup_name_by_sid(TALLOC_CTX *mem_ctx,
 721                                  DOM_SID *sid,
 722                                  fstring dom_name,
 723                                  fstring name,
 724                                  enum SID_NAME_USE *type)
 725 {
 726         char *names;
 727         char *dom_names;
 728         NTSTATUS result;
 729         BOOL rv = False;
 730         struct winbindd_domain *domain;
 731
 732         domain = find_lookup_domain_from_sid(sid);
 733
 734         if (!domain) {
 735                 DEBUG(1,("Can't find domain from sid\n"));
 736                 return False;
 737         }
 738
 739         /* Lookup name */
 740
 741         result = domain->methods->sid_to_name(domain, mem_ctx, sid, &dom_names, &names, type);
 742
 743         /* Return name and type if successful */
 744
 745         if ((rv = NT_STATUS_IS_OK(result))) {
 746                 fstrcpy(dom_name, dom_names);
 747                 fstrcpy(name, names);
 748         } else {
 749                 *type = SID_NAME_UNKNOWN;
 750                 fstrcpy(name, name_deadbeef);
 751         }
 752
 753         return rv;
 754 }
 755
 756 /* Free state information held for {set,get,end}{pw,gr}ent() functions */
 757
 758 void free_getent_state(struct getent_state *state)
 759 {
 760         struct getent_state *temp;
 761
 762         /* Iterate over state list */
 763
 764         temp = state;
 765
 766         while(temp != NULL) {
 767                 struct getent_state *next;
 768
 769                 /* Free sam entries then list entry */
 770
 771                 SAFE_FREE(state->sam_entries);
 772                 DLIST_REMOVE(state, state);
 773                 next = temp->next;
 774
 775                 SAFE_FREE(temp);
 776                 temp = next;
 777         }
 778 }
 779
 780 /* Parse winbindd related parameters */
 781
 782 BOOL winbindd_param_init(void)
 783 {
 784         /* Parse winbind uid and winbind_gid parameters */
 785
 786         if (!lp_idmap_uid(&server_state.uid_low, &server_state.uid_high)) {
 787                 DEBUG(0, ("winbindd: idmap uid range missing or invalid\n"));
 788                 DEBUG(0, ("winbindd: cannot continue, exiting.\n"));
 789                 return False;
 790         }
 791
 792         if (!lp_idmap_gid(&server_state.gid_low, &server_state.gid_high)) {
 793                 DEBUG(0, ("winbindd: idmap gid range missing or invalid\n"));
 794                 DEBUG(0, ("winbindd: cannot continue, exiting.\n"));
 795                 return False;
 796         }
 797
 798         return True;
 799 }
 800
 801 BOOL is_in_uid_range(uid_t uid)
 802 {
 803         return ((uid >= server_state.uid_low) &&
 804                 (uid <= server_state.uid_high));
 805 }
 806
 807 BOOL is_in_gid_range(gid_t gid)
 808 {
 809         return ((gid >= server_state.gid_low) &&
 810                 (gid <= server_state.gid_high));
 811 }
 812
 813 /* Is this a domain which we may assume no DOMAIN\ prefix? */
 814
 815 static BOOL assume_domain(const char *domain) {
 816         if ((lp_winbind_use_default_domain()
 817                   || lp_winbind_trusted_domains_only()) &&
 818             strequal(lp_workgroup(), domain))
 819                 return True;
 820
 821         if (strequal(get_global_sam_name(), domain))
 822                 return True;
 823
 824         return False;
 825 }
 826
 827 /* Parse a string of the form DOMAIN\user into a domain and a user */
 828
 829 BOOL parse_domain_user(const char *domuser, fstring domain, fstring user)
 830 {
 831         char *p = strchr(domuser,*lp_winbind_separator());
 832
 833         if ( !p ) {
 834                 fstrcpy(user, domuser);
 835
 836                 if ( assume_domain(lp_workgroup())) {
 837                         fstrcpy(domain, lp_workgroup());
 838                 } else {
 839                         return False;
 840                 }
 841         } else {
 842                 fstrcpy(user, p+1);
 843                 fstrcpy(domain, domuser);
 844                 domain[PTR_DIFF(p, domuser)] = 0;
 845         }
 846
 847         strupper_m(domain);
 848
 849         return True;
 850 }
 851
 852 BOOL parse_domain_user_talloc(TALLOC_CTX *mem_ctx, const char *domuser,
 853                               char **domain, char **user)
 854 {
 855         fstring fstr_domain, fstr_user;
 856         if (!parse_domain_user(domuser, fstr_domain, fstr_user)) {
 857                 return False;
 858         }
 859         *domain = talloc_strdup(mem_ctx, fstr_domain);
 860         *user = talloc_strdup(mem_ctx, fstr_user);
 861         return ((*domain != NULL) && (*user != NULL));
 862 }
 863
 864 /*
 865     Fill DOMAIN\\USERNAME entry accounting 'winbind use default domain' and
 866     'winbind separator' options.
 867     This means:
 868         - omit DOMAIN when 'winbind use default domain = true' and DOMAIN is
 869         lp_workgroup()
 870
 871     If we are a PDC or BDC, and this is for our domain, do likewise.
 872
 873     Also, if omit DOMAIN if 'winbind trusted domains only = true', as the
 874     username is then unqualified in unix
 875
 876 */
 877 void fill_domain_username(fstring name, const char *domain, const char *user, BOOL can_assume)
 878 {
 879         fstring tmp_user;
 880
 881         fstrcpy(tmp_user, user);
 882         strlower_m(tmp_user);
 883
 884         if (can_assume && assume_domain(domain)) {
 885                 strlcpy(name, user, sizeof(fstring));
 886         } else {
 887                 slprintf(name, sizeof(fstring) - 1, "%s%c%s",
 888                          domain, *lp_winbind_separator(),
 889                          tmp_user);
 890         }
 891 }
 892
 893 /*
 894  * Winbindd socket accessor functions
 895  */
 896
 897 char *get_winbind_priv_pipe_dir(void)
 898 {
 899         return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
 900 }
 901
 902 /* Open the winbindd socket */
 903
 904 static int _winbindd_socket = -1;
 905 static int _winbindd_priv_socket = -1;
 906
 907 int open_winbindd_socket(void)
 908 {
 909         if (_winbindd_socket == -1) {
 910                 _winbindd_socket = create_pipe_sock(
 911                         WINBINDD_SOCKET_DIR, WINBINDD_SOCKET_NAME, 0755);
 912                 DEBUG(10, ("open_winbindd_socket: opened socket fd %d\n",
 913                            _winbindd_socket));
 914         }
 915
 916         return _winbindd_socket;
 917 }
 918
 919 int open_winbindd_priv_socket(void)
 920 {
 921         if (_winbindd_priv_socket == -1) {
 922                 _winbindd_priv_socket = create_pipe_sock(
 923                         get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
 924                 DEBUG(10, ("open_winbindd_priv_socket: opened socket fd %d\n",
 925                            _winbindd_priv_socket));
 926         }
 927
 928         return _winbindd_priv_socket;
 929 }
 930
 931 /* Close the winbindd socket */
 932
 933 void close_winbindd_socket(void)
 934 {
 935         if (_winbindd_socket != -1) {
 936                 DEBUG(10, ("close_winbindd_socket: closing socket fd %d\n",
 937                            _winbindd_socket));
 938                 close(_winbindd_socket);
 939                 _winbindd_socket = -1;
 940         }
 941         if (_winbindd_priv_socket != -1) {
 942                 DEBUG(10, ("close_winbindd_socket: closing socket fd %d\n",
 943                            _winbindd_priv_socket));
 944                 close(_winbindd_priv_socket);
 945                 _winbindd_priv_socket = -1;
 946         }
 947 }
 948
 949 /*
 950  * Client list accessor functions
 951  */
 952
 953 static struct winbindd_cli_state *_client_list;
 954 static int _num_clients;
 955
 956 /* Return list of all connected clients */
 957
 958 struct winbindd_cli_state *winbindd_client_list(void)
 959 {
 960         return _client_list;
 961 }
 962
 963 /* Add a connection to the list */
 964
 965 void winbindd_add_client(struct winbindd_cli_state *cli)
 966 {
 967         DLIST_ADD(_client_list, cli);
 968         _num_clients++;
 969 }
 970
 971 /* Remove a client from the list */
 972
 973 void winbindd_remove_client(struct winbindd_cli_state *cli)
 974 {
 975         DLIST_REMOVE(_client_list, cli);
 976         _num_clients--;
 977 }
 978
 979 /* Demote a client to be the last in the list */
 980
 981 void winbindd_demote_client(struct winbindd_cli_state *cli)
 982 {
 983         struct winbindd_cli_state *tmp;
 984         DLIST_DEMOTE(_client_list, cli, tmp);
 985 }
 986
 987 /* Close all open clients */
 988
 989 void winbindd_kill_all_clients(void)
 990 {
 991         struct winbindd_cli_state *cl = winbindd_client_list();
 992
 993         DEBUG(10, ("winbindd_kill_all_clients: going postal\n"));
 994
 995         while (cl) {
 996                 struct winbindd_cli_state *next;
 997
 998                 next = cl->next;
 999                 winbindd_remove_client(cl);
1000                 cl = next;
1001         }
1002 }
1003
1004 /* Return number of open clients */
1005
1006 int winbindd_num_clients(void)
1007 {
1008         return _num_clients;
1009 }
1010
1011 /*****************************************************************************
1012  For idmap conversion: convert one record to new format
1013  Ancient versions (eg 2.2.3a) of winbindd_idmap.tdb mapped DOMAINNAME/rid
1014  instead of the SID.
1015 *****************************************************************************/
1016 static int convert_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA data, void *state)
1017 {
1018         struct winbindd_domain *domain;
1019         char *p;
1020         DOM_SID sid;
1021         uint32 rid;
1022         fstring keystr;
1023         fstring dom_name;
1024         TDB_DATA key2;
1025         BOOL *failed = (BOOL *)state;
1026
1027         DEBUG(10,("Converting %s\n", key.dptr));
1028
1029         p = strchr(key.dptr, '/');
1030         if (!p)
1031                 return 0;
1032
1033         *p = 0;
1034         fstrcpy(dom_name, key.dptr);
1035         *p++ = '/';
1036
1037         domain = find_domain_from_name(dom_name);
1038         if (domain == NULL) {
1039                 /* We must delete the old record. */
1040                 DEBUG(0,("Unable to find domain %s\n", dom_name ));
1041                 DEBUG(0,("deleting record %s\n", key.dptr ));
1042
1043                 if (tdb_delete(tdb, key) != 0) {
1044                         DEBUG(0, ("Unable to delete record %s\n", key.dptr));
1045                         *failed = True;
1046                         return -1;
1047                 }
1048
1049                 return 0;
1050         }
1051
1052         rid = atoi(p);
1053
1054         sid_copy(&sid, &domain->sid);
1055         sid_append_rid(&sid, rid);
1056
1057         sid_to_string(keystr, &sid);
1058         key2.dptr = keystr;
1059         key2.dsize = strlen(keystr) + 1;
1060
1061         if (tdb_store(tdb, key2, data, TDB_INSERT) != 0) {
1062                 DEBUG(0,("Unable to add record %s\n", key2.dptr ));
1063                 *failed = True;
1064                 return -1;
1065         }
1066
1067         if (tdb_store(tdb, data, key2, TDB_REPLACE) != 0) {
1068                 DEBUG(0,("Unable to update record %s\n", data.dptr ));
1069                 *failed = True;
1070                 return -1;
1071         }
1072
1073         if (tdb_delete(tdb, key) != 0) {
1074                 DEBUG(0,("Unable to delete record %s\n", key.dptr ));
1075                 *failed = True;
1076                 return -1;
1077         }
1078
1079         return 0;
1080 }
1081
1082 /* These definitions are from sam/idmap_tdb.c. Replicated here just
1083    out of laziness.... :-( */
1084
1085 /* High water mark keys */
1086 #define HWM_GROUP  "GROUP HWM"
1087 #define HWM_USER   "USER HWM"
1088
1089 /*****************************************************************************
1090  Convert the idmap database from an older version.
1091 *****************************************************************************/
1092
1093 static BOOL idmap_convert(const char *idmap_name)
1094 {
1095         int32 vers;
1096         BOOL bigendianheader;
1097         BOOL failed = False;
1098         TDB_CONTEXT *idmap_tdb;
1099
1100         if (!(idmap_tdb = tdb_open_log(idmap_name, 0,
1101                                         TDB_DEFAULT, O_RDWR,
1102                                         0600))) {
1103                 DEBUG(0, ("idmap_convert: Unable to open idmap database\n"));
1104                 return False;
1105         }
1106
1107         bigendianheader = (idmap_tdb->flags & TDB_BIGENDIAN) ? True : False;
1108
1109         vers = tdb_fetch_int32(idmap_tdb, "IDMAP_VERSION");
1110
1111         if (((vers == -1) && bigendianheader) || (IREV(vers) == IDMAP_VERSION)) {
1112                 /* Arrggghh ! Bytereversed or old big-endian - make order independent ! */
1113                 /*
1114                  * high and low records were created on a
1115                  * big endian machine and will need byte-reversing.
1116                  */
1117
1118                 int32 wm;
1119
1120                 wm = tdb_fetch_int32(idmap_tdb, HWM_USER);
1121
1122                 if (wm != -1) {
1123                         wm = IREV(wm);
1124                 }  else {
1125                         wm = server_state.uid_low;
1126                 }
1127
1128                 if (tdb_store_int32(idmap_tdb, HWM_USER, wm) == -1) {
1129                         DEBUG(0, ("idmap_convert: Unable to byteswap user hwm in idmap database\n"));
1130                         tdb_close(idmap_tdb);
1131                         return False;
1132                 }
1133
1134                 wm = tdb_fetch_int32(idmap_tdb, HWM_GROUP);
1135                 if (wm != -1) {
1136                         wm = IREV(wm);
1137                 } else {
1138                         wm = server_state.gid_low;
1139                 }
1140
1141                 if (tdb_store_int32(idmap_tdb, HWM_GROUP, wm) == -1) {
1142                         DEBUG(0, ("idmap_convert: Unable to byteswap group hwm in idmap database\n"));
1143                         tdb_close(idmap_tdb);
1144                         return False;
1145                 }
1146         }
1147
1148         /* the old format stored as DOMAIN/rid - now we store the SID direct */
1149         tdb_traverse(idmap_tdb, convert_fn, &failed);
1150
1151         if (failed) {
1152                 DEBUG(0, ("Problem during conversion\n"));
1153                 tdb_close(idmap_tdb);
1154                 return False;
1155         }
1156
1157         if (tdb_store_int32(idmap_tdb, "IDMAP_VERSION", IDMAP_VERSION) == -1) {
1158                 DEBUG(0, ("idmap_convert: Unable to dtore idmap version in databse\n"));
1159                 tdb_close(idmap_tdb);
1160                 return False;
1161         }
1162
1163         tdb_close(idmap_tdb);
1164         return True;
1165 }
1166
1167 /*****************************************************************************
1168  Convert the idmap database from an older version if necessary
1169 *****************************************************************************/
1170
1171 BOOL winbindd_upgrade_idmap(void)
1172 {
1173         pstring idmap_name;
1174         pstring backup_name;
1175         SMB_STRUCT_STAT stbuf;
1176         TDB_CONTEXT *idmap_tdb;
1177
1178         pstrcpy(idmap_name, lock_path("winbindd_idmap.tdb"));
1179
1180         if (!file_exist(idmap_name, &stbuf)) {
1181                 /* nothing to convert return */
1182                 return True;
1183         }
1184
1185         if (!(idmap_tdb = tdb_open_log(idmap_name, 0,
1186                                         TDB_DEFAULT, O_RDWR,
1187                                         0600))) {
1188                 DEBUG(0, ("idmap_convert: Unable to open idmap database\n"));
1189                 return False;
1190         }
1191
1192         if (tdb_fetch_int32(idmap_tdb, "IDMAP_VERSION") == IDMAP_VERSION) {
1193                 /* nothing to convert return */
1194                 tdb_close(idmap_tdb);
1195                 return True;
1196         }
1197
1198         /* backup_tdb expects the tdb not to be open */
1199         tdb_close(idmap_tdb);
1200
1201         DEBUG(0, ("Upgrading winbindd_idmap.tdb from an old version\n"));
1202
1203         pstrcpy(backup_name, idmap_name);
1204         pstrcat(backup_name, ".bak");
1205
1206         if (backup_tdb(idmap_name, backup_name) != 0) {
1207                 DEBUG(0, ("Could not backup idmap database\n"));
1208                 return False;
1209         }
1210
1211         return idmap_convert(idmap_name);
1212 }
1213
1214 void winbindd_flush_nscd_cache(void)
1215 {
1216 #ifdef HAVE_NSCD_FLUSH_CACHE
1217
1218         /* Flush nscd caches to get accurate new information */
1219         int ret = nscd_flush_cache("passwd");
1220         if (ret) {
1221                 DEBUG(5,("failed to flush nscd cache for 'passwd' service: %s\n",
1222                         strerror(ret)));
1223         }
1224
1225         ret = nscd_flush_cache("group");
1226         if (ret) {
1227                 DEBUG(5,("failed to flush nscd cache for 'group' service: %s\n",
1228                         strerror(ret)));
1229         }
1230 #else
1231         return;
1232 #endif
1233 }
1234