source/nsswitch/winbindd_user.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon - user related functions
   5
   6    Copyright (C) Tim Potter 2000
   7    Copyright (C) Jeremy Allison 2001.
   8    Copyright (C) Gerald (Jerry) Carter 2003.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_WINBIND
  30
  31 extern userdom_struct current_user_info;
  32
  33 /* Fill a pwent structure with information we have obtained */
  34
  35 static BOOL winbindd_fill_pwent(char *dom_name, char *user_name,
  36                                 DOM_SID *user_sid, DOM_SID *group_sid,
  37                                 char *full_name, struct winbindd_pw *pw)
  38 {
  39         fstring output_username;
  40         char *homedir;
  41         char *shell;
  42         fstring sid_string;
  43
  44         if (!pw || !dom_name || !user_name)
  45                 return False;
  46
  47         /* Resolve the uid number */
  48
  49         if (!NT_STATUS_IS_OK(idmap_sid_to_uid(user_sid, &pw->pw_uid, 0))) {
  50                 DEBUG(1, ("error getting user id for sid %s\n", sid_to_string(sid_string, user_sid)));
  51                 return False;
  52         }
  53
  54         /* Resolve the gid number */
  55
  56         if (!NT_STATUS_IS_OK(idmap_sid_to_gid(group_sid, &pw->pw_gid, 0))) {
  57                 DEBUG(1, ("error getting group id for sid %s\n", sid_to_string(sid_string, group_sid)));
  58                 return False;
  59         }
  60
  61         strlower_m(user_name);
  62
  63         /* Username */
  64
  65         fill_domain_username(output_username, dom_name, user_name);
  66
  67         safe_strcpy(pw->pw_name, output_username, sizeof(pw->pw_name) - 1);
  68
  69         /* Full name (gecos) */
  70
  71         safe_strcpy(pw->pw_gecos, full_name, sizeof(pw->pw_gecos) - 1);
  72
  73         /* Home directory and shell - use template config parameters.  The
  74            defaults are /tmp for the home directory and /bin/false for
  75            shell. */
  76
  77         /* The substitution of %U and %D in the 'template homedir' is done
  78            by alloc_sub_specified() below. */
  79
  80         fstrcpy(current_user_info.domain, dom_name);
  81
  82         homedir = alloc_sub_specified(lp_template_homedir(), user_name, dom_name, pw->pw_uid, pw->pw_gid);
  83
  84         if (!homedir)
  85                 return False;
  86
  87         safe_strcpy(pw->pw_dir, homedir, sizeof(pw->pw_dir) - 1);
  88
  89         SAFE_FREE(homedir);
  90
  91         shell = alloc_sub_specified(lp_template_shell(), user_name, dom_name, pw->pw_uid, pw->pw_gid);
  92
  93         if (!shell)
  94                 return False;
  95
  96         safe_strcpy(pw->pw_shell, shell,
  97                     sizeof(pw->pw_shell) - 1);
  98
  99         SAFE_FREE(shell);
 100
 101         /* Password - set to "x" as we can't generate anything useful here.
 102            Authentication can be done using the pam_winbind module. */
 103
 104         safe_strcpy(pw->pw_passwd, "x", sizeof(pw->pw_passwd) - 1);
 105
 106         return True;
 107 }
 108
 109 /* Wrapper for domain->methods->query_user, only on the parent->child pipe */
 110
 111 enum winbindd_result winbindd_dual_userinfo(struct winbindd_domain *domain,
 112                                             struct winbindd_cli_state *state)
 113 {
 114         DOM_SID sid;
 115         WINBIND_USERINFO user_info;
 116         NTSTATUS status;
 117
 118         /* Ensure null termination */
 119         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
 120
 121         DEBUG(3, ("[%5lu]: lookupsid %s\n", (unsigned long)state->pid,
 122                   state->request.data.sid));
 123
 124         if (!string_to_sid(&sid, state->request.data.sid)) {
 125                 DEBUG(5, ("%s not a SID\n", state->request.data.sid));
 126                 return WINBINDD_ERROR;
 127         }
 128
 129         status = domain->methods->query_user(domain, state->mem_ctx,
 130                                              &sid, &user_info);
 131         if (!NT_STATUS_IS_OK(status)) {
 132                 DEBUG(1, ("error getting user info for sid %s\n",
 133                           sid_string_static(&sid)));
 134                 return WINBINDD_ERROR;
 135         }
 136
 137         fstrcpy(state->response.data.user_info.acct_name, user_info.acct_name);
 138         fstrcpy(state->response.data.user_info.full_name, user_info.full_name);
 139         if (!sid_peek_check_rid(&domain->sid, &user_info.group_sid,
 140                                 &state->response.data.user_info.group_rid)) {
 141                 DEBUG(1, ("Could not extract group rid out of %s\n",
 142                           sid_string_static(&sid)));
 143                 return WINBINDD_ERROR;
 144         }
 145
 146         return WINBINDD_OK;
 147 }
 148
 149 struct getpwsid_state {
 150         struct winbindd_cli_state *state;
 151         struct winbindd_domain *domain;
 152         char *username;
 153         char *fullname;
 154         DOM_SID user_sid;
 155         uid_t uid;
 156         DOM_SID group_sid;
 157         gid_t gid;
 158 };
 159
 160 static void getpwsid_queryuser_recv(void *private, BOOL success,
 161                                     const char *acct_name,
 162                                     const char *full_name, uint32 group_rid);
 163 static void getpwsid_sid2uid_recv(void *private, BOOL success, uid_t uid);
 164 static void getpwsid_sid2gid_recv(void *private, BOOL success, gid_t gid);
 165
 166 static void winbindd_getpwsid(struct winbindd_cli_state *state,
 167                               const DOM_SID *sid)
 168 {
 169         struct getpwsid_state *s;
 170
 171         s = TALLOC_P(state->mem_ctx, struct getpwsid_state);
 172         if (s == NULL) {
 173                 DEBUG(0, ("talloc failed\n"));
 174                 goto error;
 175         }
 176
 177         s->state = state;
 178         s->domain = find_domain_from_sid_noinit(sid);
 179         if (s->domain == NULL) {
 180                 DEBUG(3, ("Could not find domain for sid %s\n",
 181                           sid_string_static(sid)));
 182                 goto error;
 183         }
 184
 185         sid_copy(&s->user_sid, sid);
 186
 187         query_user_async(s->state->mem_ctx, s->domain, sid,
 188                          getpwsid_queryuser_recv, s);
 189         return;
 190
 191  error:
 192         s->state->response.result = WINBINDD_ERROR;
 193         request_finished(state);
 194 }
 195
 196 static void getpwsid_queryuser_recv(void *private, BOOL success,
 197                                     const char *acct_name,
 198                                     const char *full_name, uint32 group_rid)
 199 {
 200         struct getpwsid_state *s =
 201                 talloc_get_type_abort(private, struct getpwsid_state);
 202
 203         if (!success) {
 204                 DEBUG(5, ("Could not query user %s\\%s\n", s->domain->name,
 205                           s->username));
 206                 s->state->response.result = WINBINDD_ERROR;
 207                 request_finished(s->state);
 208                 return;
 209         }
 210
 211         s->username = talloc_strdup(s->state->mem_ctx, acct_name);
 212         s->fullname = talloc_strdup(s->state->mem_ctx, full_name);
 213         sid_copy(&s->group_sid, &s->domain->sid);
 214         sid_append_rid(&s->group_sid, group_rid);
 215
 216         winbindd_sid2uid_async(s->state->mem_ctx, &s->user_sid,
 217                                getpwsid_sid2uid_recv, s);
 218 }
 219
 220 static void getpwsid_sid2uid_recv(void *private, BOOL success, uid_t uid)
 221 {
 222         struct getpwsid_state *s =
 223                 talloc_get_type_abort(private, struct getpwsid_state);
 224
 225         if (!success) {
 226                 DEBUG(5, ("Could not query user's %s\\%s uid\n",
 227                           s->domain->name, s->username));
 228                 s->state->response.result = WINBINDD_ERROR;
 229                 request_finished(s->state);
 230                 return;
 231         }
 232
 233         s->uid = uid;
 234         winbindd_sid2gid_async(s->state->mem_ctx, &s->group_sid,
 235                                getpwsid_sid2gid_recv, s);
 236 }
 237
 238 static void getpwsid_sid2gid_recv(void *private, BOOL success, gid_t gid)
 239 {
 240         struct getpwsid_state *s =
 241                 talloc_get_type_abort(private, struct getpwsid_state);
 242         struct winbindd_pw *pw;
 243         fstring output_username;
 244         char *homedir;
 245         char *shell;
 246
 247         s->state->response.result = WINBINDD_ERROR;
 248
 249         if (!success) {
 250                 DEBUG(5, ("Could not query user's %s\\%s\n gid",
 251                           s->domain->name, s->username));
 252                 goto done;
 253         }
 254
 255         s->gid = gid;
 256
 257         pw = &s->state->response.data.pw;
 258         pw->pw_uid = s->uid;
 259         pw->pw_gid = s->gid;
 260         fill_domain_username(output_username, s->domain->name, s->username);
 261         safe_strcpy(pw->pw_name, output_username, sizeof(pw->pw_name) - 1);
 262         safe_strcpy(pw->pw_gecos, s->fullname, sizeof(pw->pw_gecos) - 1);
 263
 264         /* Home directory and shell - use template config parameters.  The
 265            defaults are /tmp for the home directory and /bin/false for
 266            shell. */
 267
 268         /* The substitution of %U and %D in the 'template homedir' is done
 269            by alloc_sub_specified() below. */
 270
 271         fstrcpy(current_user_info.domain, s->domain->name);
 272
 273         homedir = alloc_sub_specified(lp_template_homedir(), s->username,
 274                                       s->domain->name, pw->pw_uid, pw->pw_gid);
 275         if (homedir == NULL) {
 276                 DEBUG(5, ("Could not compose homedir\n"));
 277                 goto done;
 278         }
 279         safe_strcpy(pw->pw_dir, homedir, sizeof(pw->pw_dir) - 1);
 280         SAFE_FREE(homedir);
 281
 282         shell = alloc_sub_specified(lp_template_shell(), s->username,
 283                                     s->domain->name, pw->pw_uid, pw->pw_gid);
 284         if (shell == NULL) {
 285                 DEBUG(5, ("Could not compose shell\n"));
 286                 goto done;
 287         }
 288         safe_strcpy(pw->pw_shell, shell, sizeof(pw->pw_shell) - 1);
 289         SAFE_FREE(shell);
 290
 291         /* Password - set to "x" as we can't generate anything useful here.
 292            Authentication can be done using the pam_winbind module. */
 293
 294         safe_strcpy(pw->pw_passwd, "x", sizeof(pw->pw_passwd) - 1);
 295
 296         s->state->response.result = WINBINDD_OK;
 297
 298  done:
 299         request_finished(s->state);
 300 }
 301
 302 /* Return a password structure from a username.  */
 303
 304 static void getpwnam_name2sid_recv(void *private, BOOL success,
 305                                    const DOM_SID *sid, enum SID_NAME_USE type);
 306
 307 enum winbindd_result winbindd_getpwnam(struct winbindd_cli_state *state)
 308 {
 309         struct winbindd_domain *domain;
 310         fstring domname, username;
 311
 312         /* Ensure null termination */
 313         state->request.data.username[sizeof(state->request.data.username)-1]='\0';
 314
 315         DEBUG(3, ("[%5lu]: getpwnam %s\n", (unsigned long)state->pid,
 316                   state->request.data.username));
 317
 318         if (!parse_domain_user(state->request.data.username, domname,
 319                                username)) {
 320                 DEBUG(0, ("Could not parse domain user: %s\n",
 321                           state->request.data.username));
 322                 return WINBINDD_ERROR;
 323         }
 324
 325         /* Get info for the domain */
 326
 327         domain = find_lookup_domain_from_name(domname);
 328
 329         if (domain == NULL) {
 330                 DEBUG(7, ("could not find domain entry for domain %s\n",
 331                           domname));
 332                 return WINBINDD_ERROR;
 333         }
 334
 335         if ( domain->primary && lp_winbind_trusted_domains_only()) {
 336                 DEBUG(7,("winbindd_getpwnam: My domain -- rejecting "
 337                          "getgroups() for %s\\%s.\n", domname, username));
 338                 return WINBINDD_ERROR;
 339         }
 340
 341         /* Get rid and name type from name.  The following costs 1 packet */
 342
 343         winbindd_lookupname_async(state->mem_ctx, domname, username,
 344                                   getpwnam_name2sid_recv, state);
 345         return WINBINDD_PENDING;
 346 }
 347
 348 static void getpwnam_name2sid_recv(void *private, BOOL success,
 349                                    const DOM_SID *sid, enum SID_NAME_USE type)
 350 {
 351         struct winbindd_cli_state *state = private;
 352
 353         if (!success) {
 354                 DEBUG(5, ("Could not lookup name for user %s\n",
 355                           state->request.data.username));
 356                 state->response.result = WINBINDD_ERROR;
 357                 request_finished(state);
 358                 return;
 359         }
 360
 361         if ((type != SID_NAME_USER) && (type != SID_NAME_COMPUTER)) {
 362                 DEBUG(5, ("%s is not a user\n", state->request.data.username));
 363                 state->response.result = WINBINDD_ERROR;
 364                 request_finished(state);
 365                 return;
 366         }
 367
 368         winbindd_getpwsid(state, sid);
 369 }
 370
 371 /* Return a password structure given a uid number */
 372
 373 enum winbindd_result winbindd_getpwuid(struct winbindd_cli_state *state)
 374 {
 375         DOM_SID user_sid;
 376         NTSTATUS status;
 377
 378         /* Bug out if the uid isn't in the winbind range */
 379
 380         if ((state->request.data.uid < server_state.uid_low ) ||
 381             (state->request.data.uid > server_state.uid_high))
 382                 return WINBINDD_ERROR;
 383
 384         DEBUG(3, ("[%5lu]: getpwuid %lu\n", (unsigned long)state->pid,
 385                   (unsigned long)state->request.data.uid));
 386
 387         status = idmap_uid_to_sid(&user_sid, state->request.data.uid,
 388                                   ID_QUERY_ONLY | ID_CACHE_ONLY);
 389
 390         if (!NT_STATUS_IS_OK(status)) {
 391                 DEBUG(5, ("Could not find SID for uid %lu\n",
 392                           (unsigned long)state->request.data.uid));
 393                 return WINBINDD_ERROR;
 394         }
 395
 396         winbindd_getpwsid(state, &user_sid);
 397         return WINBINDD_PENDING;
 398 }
 399
 400 /*
 401  * set/get/endpwent functions
 402  */
 403
 404 /* Rewind file pointer for ntdom passwd database */
 405
 406 enum winbindd_result winbindd_setpwent(struct winbindd_cli_state *state)
 407 {
 408         struct winbindd_domain *domain;
 409
 410         DEBUG(3, ("[%5lu]: setpwent\n", (unsigned long)state->pid));
 411
 412         /* Check user has enabled this */
 413
 414         if (!lp_winbind_enum_users())
 415                 return WINBINDD_ERROR;
 416
 417         /* Free old static data if it exists */
 418
 419         if (state->getpwent_state != NULL) {
 420                 free_getent_state(state->getpwent_state);
 421                 state->getpwent_state = NULL;
 422         }
 423
 424 #if 0   /* JERRY */
 425         /* add any local users we have */
 426
 427         if ( (domain_state = (struct getent_state *)malloc(sizeof(struct getent_state))) == NULL )
 428                 return WINBINDD_ERROR;
 429
 430         ZERO_STRUCTP(domain_state);
 431
 432         /* Add to list of open domains */
 433
 434         DLIST_ADD(state->getpwent_state, domain_state);
 435 #endif
 436
 437         /* Create sam pipes for each domain we know about */
 438
 439         for(domain = domain_list(); domain != NULL; domain = domain->next) {
 440                 struct getent_state *domain_state;
 441
 442
 443                 /* don't add our domaina if we are a PDC or if we
 444                    are a member of a Samba domain */
 445
 446                 if ( (IS_DC || lp_winbind_trusted_domains_only())
 447                         && strequal(domain->name, lp_workgroup()) )
 448                 {
 449                         continue;
 450                 }
 451
 452                 /* Create a state record for this domain */
 453
 454                 if ((domain_state = SMB_MALLOC_P(struct getent_state)) == NULL)
 455                         return WINBINDD_ERROR;
 456
 457                 ZERO_STRUCTP(domain_state);
 458
 459                 fstrcpy(domain_state->domain_name, domain->name);
 460
 461                 /* Add to list of open domains */
 462
 463                 DLIST_ADD(state->getpwent_state, domain_state);
 464         }
 465
 466         state->getpwent_initialized = True;
 467
 468         return WINBINDD_OK;
 469 }
 470
 471 /* Close file pointer to ntdom passwd database */
 472
 473 enum winbindd_result winbindd_endpwent(struct winbindd_cli_state *state)
 474 {
 475         DEBUG(3, ("[%5lu]: endpwent\n", (unsigned long)state->pid));
 476
 477         free_getent_state(state->getpwent_state);
 478         state->getpwent_initialized = False;
 479         state->getpwent_state = NULL;
 480
 481         return WINBINDD_OK;
 482 }
 483
 484 /* Get partial list of domain users for a domain.  We fill in the sam_entries,
 485    and num_sam_entries fields with domain user information.  The dispinfo_ndx
 486    field is incremented to the index of the next user to fetch.  Return True if
 487    some users were returned, False otherwise. */
 488
 489 static BOOL get_sam_user_entries(struct getent_state *ent, TALLOC_CTX *mem_ctx)
 490 {
 491         NTSTATUS status;
 492         uint32 num_entries;
 493         WINBIND_USERINFO *info;
 494         struct getpwent_user *name_list = NULL;
 495         BOOL result = False;
 496         struct winbindd_domain *domain;
 497         struct winbindd_methods *methods;
 498         unsigned int i;
 499
 500         if (ent->num_sam_entries)
 501                 return False;
 502
 503         if (!(domain = find_domain_from_name(ent->domain_name))) {
 504                 DEBUG(3, ("no such domain %s in get_sam_user_entries\n",
 505                           ent->domain_name));
 506                 return False;
 507         }
 508
 509         methods = domain->methods;
 510
 511         /* Free any existing user info */
 512
 513         SAFE_FREE(ent->sam_entries);
 514         ent->num_sam_entries = 0;
 515
 516         /* Call query_user_list to get a list of usernames and user rids */
 517
 518         num_entries = 0;
 519
 520         status = methods->query_user_list(domain, mem_ctx, &num_entries,
 521                                           &info);
 522
 523         if (num_entries) {
 524                 struct getpwent_user *tnl;
 525
 526                 tnl = SMB_REALLOC_ARRAY(name_list, struct getpwent_user, ent->num_sam_entries + num_entries);
 527
 528                 if (!tnl) {
 529                         DEBUG(0,("get_sam_user_entries realloc failed.\n"));
 530                         SAFE_FREE(name_list);
 531                         goto done;
 532                 } else
 533                         name_list = tnl;
 534         }
 535
 536         for (i = 0; i < num_entries; i++) {
 537                 /* Store account name and gecos */
 538                 if (!info[i].acct_name) {
 539                         fstrcpy(name_list[ent->num_sam_entries + i].name, "");
 540                 } else {
 541                         fstrcpy(name_list[ent->num_sam_entries + i].name,
 542                                 info[i].acct_name);
 543                 }
 544                 if (!info[i].full_name) {
 545                         fstrcpy(name_list[ent->num_sam_entries + i].gecos, "");
 546                 } else {
 547                         fstrcpy(name_list[ent->num_sam_entries + i].gecos,
 548                                 info[i].full_name);
 549                 }
 550
 551                 /* User and group ids */
 552                 sid_copy(&name_list[ent->num_sam_entries+i].user_sid,
 553                          &info[i].user_sid);
 554                 sid_copy(&name_list[ent->num_sam_entries+i].group_sid,
 555                          &info[i].group_sid);
 556         }
 557
 558         ent->num_sam_entries += num_entries;
 559
 560         /* Fill in remaining fields */
 561
 562         ent->sam_entries = name_list;
 563         ent->sam_entry_index = 0;
 564         result = ent->num_sam_entries > 0;
 565
 566  done:
 567
 568         return result;
 569 }
 570
 571 /* Fetch next passwd entry from ntdom database */
 572
 573 #define MAX_GETPWENT_USERS 500
 574
 575 enum winbindd_result winbindd_getpwent(struct winbindd_cli_state *state)
 576 {
 577         struct getent_state *ent;
 578         struct winbindd_pw *user_list;
 579         int num_users, user_list_ndx = 0, i;
 580
 581         DEBUG(3, ("[%5lu]: getpwent\n", (unsigned long)state->pid));
 582
 583         /* Check user has enabled this */
 584
 585         if (!lp_winbind_enum_users())
 586                 return WINBINDD_ERROR;
 587
 588         /* Allocate space for returning a chunk of users */
 589
 590         num_users = MIN(MAX_GETPWENT_USERS, state->request.data.num_entries);
 591
 592         if ((state->response.extra_data = SMB_MALLOC_ARRAY(struct winbindd_pw, num_users)) == NULL)
 593                 return WINBINDD_ERROR;
 594
 595         memset(state->response.extra_data, 0, num_users *
 596                sizeof(struct winbindd_pw));
 597
 598         user_list = (struct winbindd_pw *)state->response.extra_data;
 599
 600         if (!state->getpwent_initialized)
 601                 winbindd_setpwent(state);
 602
 603         if (!(ent = state->getpwent_state))
 604                 return WINBINDD_ERROR;
 605
 606         /* Start sending back users */
 607
 608         for (i = 0; i < num_users; i++) {
 609                 struct getpwent_user *name_list = NULL;
 610                 uint32 result;
 611
 612                 /* Do we need to fetch another chunk of users? */
 613
 614                 if (ent->num_sam_entries == ent->sam_entry_index) {
 615
 616                         while(ent &&
 617                               !get_sam_user_entries(ent, state->mem_ctx)) {
 618                                 struct getent_state *next_ent;
 619
 620                                 /* Free state information for this domain */
 621
 622                                 SAFE_FREE(ent->sam_entries);
 623
 624                                 next_ent = ent->next;
 625                                 DLIST_REMOVE(state->getpwent_state, ent);
 626
 627                                 SAFE_FREE(ent);
 628                                 ent = next_ent;
 629                         }
 630
 631                         /* No more domains */
 632
 633                         if (!ent)
 634                                 break;
 635                 }
 636
 637                 name_list = ent->sam_entries;
 638
 639                 /* Lookup user info */
 640
 641                 result = winbindd_fill_pwent(
 642                         ent->domain_name,
 643                         name_list[ent->sam_entry_index].name,
 644                         &name_list[ent->sam_entry_index].user_sid,
 645                         &name_list[ent->sam_entry_index].group_sid,
 646                         name_list[ent->sam_entry_index].gecos,
 647                         &user_list[user_list_ndx]);
 648
 649                 ent->sam_entry_index++;
 650
 651                 /* Add user to return list */
 652
 653                 if (result) {
 654
 655                         user_list_ndx++;
 656                         state->response.data.num_entries++;
 657                         state->response.length +=
 658                                 sizeof(struct winbindd_pw);
 659
 660                 } else
 661                         DEBUG(1, ("could not lookup domain user %s\n",
 662                                   name_list[ent->sam_entry_index].name));
 663         }
 664
 665         /* Out of domains */
 666
 667         return (user_list_ndx > 0) ? WINBINDD_OK : WINBINDD_ERROR;
 668 }
 669
 670 /* List domain users without mapping to unix ids */
 671
 672 enum winbindd_result winbindd_list_users(struct winbindd_cli_state *state)
 673 {
 674         struct winbindd_domain *domain;
 675         WINBIND_USERINFO *info;
 676         const char *which_domain;
 677         uint32 num_entries = 0, total_entries = 0;
 678         char *ted, *extra_data = NULL;
 679         int extra_data_len = 0;
 680         enum winbindd_result rv = WINBINDD_ERROR;
 681
 682         DEBUG(3, ("[%5lu]: list users\n", (unsigned long)state->pid));
 683
 684         /* Ensure null termination */
 685         state->request.domain_name[sizeof(state->request.domain_name)-1]='\0';
 686         which_domain = state->request.domain_name;
 687
 688         /* Enumerate over trusted domains */
 689
 690         for (domain = domain_list(); domain; domain = domain->next) {
 691                 NTSTATUS status;
 692                 struct winbindd_methods *methods;
 693                 unsigned int i;
 694
 695                 /* if we have a domain name restricting the request and this
 696                    one in the list doesn't match, then just bypass the remainder
 697                    of the loop */
 698
 699                 if ( *which_domain && !strequal(which_domain, domain->name) )
 700                         continue;
 701
 702                 methods = domain->methods;
 703
 704                 /* Query display info */
 705                 status = methods->query_user_list(domain, state->mem_ctx,
 706                                                   &num_entries, &info);
 707
 708                 if (num_entries == 0)
 709                         continue;
 710
 711                 /* Allocate some memory for extra data */
 712                 total_entries += num_entries;
 713
 714                 ted = SMB_REALLOC(extra_data, sizeof(fstring) * total_entries);
 715
 716                 if (!ted) {
 717                         DEBUG(0,("failed to enlarge buffer!\n"));
 718                         SAFE_FREE(extra_data);
 719                         goto done;
 720                 } else
 721                         extra_data = ted;
 722
 723                 /* Pack user list into extra data fields */
 724
 725                 for (i = 0; i < num_entries; i++) {
 726                         fstring acct_name, name;
 727
 728                         if (!info[i].acct_name) {
 729                                 fstrcpy(acct_name, "");
 730                         } else {
 731                                 fstrcpy(acct_name, info[i].acct_name);
 732                         }
 733
 734                         fill_domain_username(name, domain->name, acct_name);
 735
 736                                 /* Append to extra data */
 737                         memcpy(&extra_data[extra_data_len], name,
 738                                strlen(name));
 739                         extra_data_len += strlen(name);
 740                         extra_data[extra_data_len++] = ',';
 741                 }
 742         }
 743
 744         /* Assign extra_data fields in response structure */
 745
 746         if (extra_data) {
 747                 extra_data[extra_data_len - 1] = '\0';
 748                 state->response.extra_data = extra_data;
 749                 state->response.length += extra_data_len;
 750         }
 751
 752         /* No domains responded but that's still OK so don't return an
 753            error. */
 754
 755         rv = WINBINDD_OK;
 756
 757  done:
 758
 759         return rv;
 760 }