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