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         /* Username */
  62
  63         fill_domain_username(output_username, dom_name, user_name);
  64
  65         safe_strcpy(pw->pw_name, output_username, sizeof(pw->pw_name) - 1);
  66
  67         /* Full name (gecos) */
  68
  69         safe_strcpy(pw->pw_gecos, full_name, sizeof(pw->pw_gecos) - 1);
  70
  71         /* Home directory and shell - use template config parameters.  The
  72            defaults are /tmp for the home directory and /bin/false for
  73            shell. */
  74
  75         /* The substitution of %U and %D in the 'template homedir' is done
  76            by alloc_sub_specified() below. */
  77
  78         fstrcpy(current_user_info.domain, dom_name);
  79
  80         homedir = alloc_sub_specified(lp_template_homedir(), user_name, dom_name, pw->pw_uid, pw->pw_gid);
  81
  82         if (!homedir)
  83                 return False;
  84
  85         safe_strcpy(pw->pw_dir, homedir, sizeof(pw->pw_dir) - 1);
  86
  87         SAFE_FREE(homedir);
  88
  89         shell = alloc_sub_specified(lp_template_shell(), user_name, dom_name, pw->pw_uid, pw->pw_gid);
  90
  91         if (!shell)
  92                 return False;
  93
  94         safe_strcpy(pw->pw_shell, shell,
  95                     sizeof(pw->pw_shell) - 1);
  96
  97         SAFE_FREE(shell);
  98
  99         /* Password - set to "x" as we can't generate anything useful here.
 100            Authentication can be done using the pam_winbind module. */
 101
 102         safe_strcpy(pw->pw_passwd, "x", sizeof(pw->pw_passwd) - 1);
 103
 104         return True;
 105 }
 106
 107 /* Return a password structure from a username.  */
 108
 109 enum winbindd_result winbindd_getpwnam(struct winbindd_cli_state *state)
 110 {
 111         WINBIND_USERINFO user_info;
 112         WINBINDD_PW *pw;
 113         DOM_SID user_sid;
 114         NTSTATUS status;
 115         fstring name_domain, name_user;
 116         enum SID_NAME_USE name_type;
 117         struct winbindd_domain *domain;
 118         TALLOC_CTX *mem_ctx;
 119
 120         /* Ensure null termination */
 121         state->request.data.username[sizeof(state->request.data.username)-1]='\0';
 122
 123         DEBUG(3, ("[%5lu]: getpwnam %s\n", (unsigned long)state->pid,
 124                   state->request.data.username));
 125
 126         /* Parse domain and username */
 127
 128         parse_domain_user(state->request.data.username,
 129                           name_domain, name_user);
 130
 131         /* if this is our local domain (or no domain), the do a local tdb search */
 132
 133         if ( !*name_domain || strequal(name_domain, get_global_sam_name()) ) {
 134                 if ( !(pw = wb_getpwnam(name_user)) ) {
 135                         DEBUG(5,("winbindd_getpwnam: lookup for %s\\%s failed\n",
 136                                 name_domain, name_user));
 137                         return WINBINDD_ERROR;
 138                 }
 139                 memcpy( &state->response.data.pw, pw, sizeof(WINBINDD_PW) );
 140                 return WINBINDD_OK;
 141         }
 142
 143         /* should we deal with users for our domain? */
 144
 145         if ((domain = find_domain_from_name(name_domain)) == NULL) {
 146                 DEBUG(5, ("no such domain: %s\n", name_domain));
 147                 return WINBINDD_ERROR;
 148         }
 149
 150         if ( domain->primary && lp_winbind_trusted_domains_only()) {
 151                 DEBUG(7,("winbindd_getpwnam: My domain -- rejecting getpwnam() for %s\\%s.\n",
 152                         name_domain, name_user));
 153                 return WINBINDD_ERROR;
 154         }
 155
 156         /* Get rid and name type from name */
 157
 158         if (!winbindd_lookup_sid_by_name(domain, domain->name, name_user, &user_sid, &name_type)) {
 159                 DEBUG(1, ("user '%s' does not exist\n", name_user));
 160                 return WINBINDD_ERROR;
 161         }
 162
 163         if (name_type != SID_NAME_USER && name_type != SID_NAME_COMPUTER) {
 164                 DEBUG(1, ("name '%s' is not a user name: %d\n", name_user,
 165                           name_type));
 166                 return WINBINDD_ERROR;
 167         }
 168
 169         /* Get some user info. */
 170
 171         if (!(mem_ctx = talloc_init("winbindd_getpwnam([%s]\\[%s])",
 172                                           name_domain, name_user))) {
 173                 DEBUG(1, ("out of memory\n"));
 174                 return WINBINDD_ERROR;
 175         }
 176
 177         status = domain->methods->query_user(domain, mem_ctx, &user_sid,
 178                                              &user_info);
 179
 180         if (!NT_STATUS_IS_OK(status)) {
 181                 DEBUG(1, ("error getting user info for user '[%s]\\[%s]'\n",
 182                           name_domain, name_user));
 183                 talloc_destroy(mem_ctx);
 184                 return WINBINDD_ERROR;
 185         }
 186
 187         /* Now take all this information and fill in a passwd structure */
 188         if (!winbindd_fill_pwent(name_domain, user_info.acct_name,
 189                                  user_info.user_sid, user_info.group_sid,
 190                                  user_info.full_name,
 191                                  &state->response.data.pw)) {
 192                 talloc_destroy(mem_ctx);
 193                 return WINBINDD_ERROR;
 194         }
 195
 196         talloc_destroy(mem_ctx);
 197
 198         return WINBINDD_OK;
 199 }
 200
 201 /* Return a password structure given a uid number */
 202
 203 enum winbindd_result winbindd_getpwuid(struct winbindd_cli_state *state)
 204 {
 205         DOM_SID user_sid;
 206         struct winbindd_domain *domain;
 207         WINBINDD_PW *pw;
 208         fstring dom_name;
 209         fstring user_name;
 210         enum SID_NAME_USE name_type;
 211         WINBIND_USERINFO user_info;
 212         TALLOC_CTX *mem_ctx;
 213         NTSTATUS status;
 214         gid_t gid;
 215
 216         /* Bug out if the uid isn't in the winbind range */
 217
 218         if ((state->request.data.uid < server_state.uid_low ) ||
 219             (state->request.data.uid > server_state.uid_high))
 220                 return WINBINDD_ERROR;
 221
 222         DEBUG(3, ("[%5lu]: getpwuid %lu\n", (unsigned long)state->pid,
 223                   (unsigned long)state->request.data.uid));
 224
 225         /* always try local tdb first */
 226
 227         if ( (pw = wb_getpwuid(state->request.data.uid)) != NULL ) {
 228                 memcpy( &state->response.data.pw, pw, sizeof(WINBINDD_PW) );
 229                 return WINBINDD_OK;
 230         }
 231
 232         /* Get rid from uid */
 233
 234         if (!NT_STATUS_IS_OK(idmap_uid_to_sid(&user_sid, state->request.data.uid))) {
 235                 DEBUG(1, ("could not convert uid %lu to SID\n",
 236                           (unsigned long)state->request.data.uid));
 237                 return WINBINDD_ERROR;
 238         }
 239
 240         /* Get name and name type from rid */
 241
 242         if (!winbindd_lookup_name_by_sid(&user_sid, dom_name, user_name, &name_type)) {
 243                 fstring temp;
 244
 245                 sid_to_string(temp, &user_sid);
 246                 DEBUG(1, ("could not lookup sid %s\n", temp));
 247                 return WINBINDD_ERROR;
 248         }
 249
 250         domain = find_domain_from_sid(&user_sid);
 251
 252         if (!domain) {
 253                 DEBUG(1,("Can't find domain from sid\n"));
 254                 return WINBINDD_ERROR;
 255         }
 256
 257         /* Get some user info */
 258
 259         if (!(mem_ctx = talloc_init("winbind_getpwuid(%lu)",
 260                                     (unsigned long)state->request.data.uid))) {
 261
 262                 DEBUG(1, ("out of memory\n"));
 263                 return WINBINDD_ERROR;
 264         }
 265
 266         status = domain->methods->query_user(domain, mem_ctx, &user_sid,
 267                                              &user_info);
 268
 269         if (!NT_STATUS_IS_OK(status)) {
 270                 DEBUG(1, ("error getting user info for user '%s'\n",
 271                           user_name));
 272                 talloc_destroy(mem_ctx);
 273                 return WINBINDD_ERROR;
 274         }
 275
 276         /* Check group has a gid number */
 277
 278         if (!NT_STATUS_IS_OK(idmap_sid_to_gid(user_info.group_sid, &gid, 0))) {
 279                 DEBUG(1, ("error getting group id for user %s\n", user_name));
 280                 talloc_destroy(mem_ctx);
 281                 return WINBINDD_ERROR;
 282         }
 283
 284         /* Fill in password structure */
 285
 286         if (!winbindd_fill_pwent(domain->name, user_info.acct_name, user_info.user_sid,
 287                                  user_info.group_sid,
 288                                  user_info.full_name, &state->response.data.pw)) {
 289                 talloc_destroy(mem_ctx);
 290                 return WINBINDD_ERROR;
 291         }
 292
 293         talloc_destroy(mem_ctx);
 294
 295         return WINBINDD_OK;
 296 }
 297
 298 /*
 299  * set/get/endpwent functions
 300  */
 301
 302 /* Rewind file pointer for ntdom passwd database */
 303
 304 enum winbindd_result winbindd_setpwent(struct winbindd_cli_state *state)
 305 {
 306         struct winbindd_domain *domain;
 307
 308         DEBUG(3, ("[%5lu]: setpwent\n", (unsigned long)state->pid));
 309
 310         /* Check user has enabled this */
 311
 312         if (!lp_winbind_enum_users())
 313                 return WINBINDD_ERROR;
 314
 315         /* Free old static data if it exists */
 316
 317         if (state->getpwent_state != NULL) {
 318                 free_getent_state(state->getpwent_state);
 319                 state->getpwent_state = NULL;
 320         }
 321
 322 #if 0   /* JERRY */
 323         /* add any local users we have */
 324
 325         if ( (domain_state = (struct getent_state *)malloc(sizeof(struct getent_state))) == NULL )
 326                 return WINBINDD_ERROR;
 327
 328         ZERO_STRUCTP(domain_state);
 329
 330         /* Add to list of open domains */
 331
 332         DLIST_ADD(state->getpwent_state, domain_state);
 333 #endif
 334
 335         /* Create sam pipes for each domain we know about */
 336
 337         for(domain = domain_list(); domain != NULL; domain = domain->next) {
 338                 struct getent_state *domain_state;
 339
 340
 341                 /* don't add our domaina if we are a PDC or if we
 342                    are a member of a Samba domain */
 343
 344                 if ( (IS_DC || lp_winbind_trusted_domains_only())
 345                         && strequal(domain->name, lp_workgroup()) )
 346                 {
 347                         continue;
 348                 }
 349
 350                 /* Create a state record for this domain */
 351
 352                 if ((domain_state = (struct getent_state *)
 353                      malloc(sizeof(struct getent_state))) == NULL)
 354                         return WINBINDD_ERROR;
 355
 356                 ZERO_STRUCTP(domain_state);
 357
 358                 fstrcpy(domain_state->domain_name, domain->name);
 359
 360                 /* Add to list of open domains */
 361
 362                 DLIST_ADD(state->getpwent_state, domain_state);
 363         }
 364
 365         state->getpwent_initialized = True;
 366
 367         return WINBINDD_OK;
 368 }
 369
 370 /* Close file pointer to ntdom passwd database */
 371
 372 enum winbindd_result winbindd_endpwent(struct winbindd_cli_state *state)
 373 {
 374         DEBUG(3, ("[%5lu]: endpwent\n", (unsigned long)state->pid));
 375
 376         free_getent_state(state->getpwent_state);
 377         state->getpwent_initialized = False;
 378         state->getpwent_state = NULL;
 379
 380         return WINBINDD_OK;
 381 }
 382
 383 /* Get partial list of domain users for a domain.  We fill in the sam_entries,
 384    and num_sam_entries fields with domain user information.  The dispinfo_ndx
 385    field is incremented to the index of the next user to fetch.  Return True if
 386    some users were returned, False otherwise. */
 387
 388 static BOOL get_sam_user_entries(struct getent_state *ent)
 389 {
 390         NTSTATUS status;
 391         uint32 num_entries;
 392         WINBIND_USERINFO *info;
 393         struct getpwent_user *name_list = NULL;
 394         BOOL result = False;
 395         TALLOC_CTX *mem_ctx;
 396         struct winbindd_domain *domain;
 397         struct winbindd_methods *methods;
 398         unsigned int i;
 399
 400         if (ent->num_sam_entries)
 401                 return False;
 402
 403         if (!(mem_ctx = talloc_init("get_sam_user_entries(%s)",
 404                                     ent->domain_name)))
 405                 return False;
 406
 407         if (!(domain = find_domain_from_name(ent->domain_name))) {
 408                 DEBUG(3, ("no such domain %s in get_sam_user_entries\n",
 409                           ent->domain_name));
 410                 return False;
 411         }
 412
 413         methods = domain->methods;
 414
 415         /* Free any existing user info */
 416
 417         SAFE_FREE(ent->sam_entries);
 418         ent->num_sam_entries = 0;
 419
 420         /* Call query_user_list to get a list of usernames and user rids */
 421
 422         num_entries = 0;
 423
 424         status = methods->query_user_list(domain, mem_ctx, &num_entries,
 425                                           &info);
 426
 427         if (num_entries) {
 428                 struct getpwent_user *tnl;
 429
 430                 tnl = (struct getpwent_user *)Realloc(name_list,
 431                                                       sizeof(struct getpwent_user) *
 432                                                       (ent->num_sam_entries +
 433                                                        num_entries));
 434
 435                 if (!tnl) {
 436                         DEBUG(0,("get_sam_user_entries realloc failed.\n"));
 437                         SAFE_FREE(name_list);
 438                         goto done;
 439                 } else
 440                         name_list = tnl;
 441         }
 442
 443         for (i = 0; i < num_entries; i++) {
 444                 /* Store account name and gecos */
 445                 if (!info[i].acct_name) {
 446                         fstrcpy(name_list[ent->num_sam_entries + i].name, "");
 447                 } else {
 448                         fstrcpy(name_list[ent->num_sam_entries + i].name,
 449                                 info[i].acct_name);
 450                 }
 451                 if (!info[i].full_name) {
 452                         fstrcpy(name_list[ent->num_sam_entries + i].gecos, "");
 453                 } else {
 454                         fstrcpy(name_list[ent->num_sam_entries + i].gecos,
 455                                 info[i].full_name);
 456                 }
 457
 458                 /* User and group ids */
 459                 sid_copy(&name_list[ent->num_sam_entries+i].user_sid, info[i].user_sid);
 460                 sid_copy(&name_list[ent->num_sam_entries+i].group_sid, info[i].group_sid);
 461         }
 462
 463         ent->num_sam_entries += num_entries;
 464
 465         /* Fill in remaining fields */
 466
 467         ent->sam_entries = name_list;
 468         ent->sam_entry_index = 0;
 469         result = ent->num_sam_entries > 0;
 470
 471  done:
 472
 473         talloc_destroy(mem_ctx);
 474
 475         return result;
 476 }
 477
 478 /* Fetch next passwd entry from ntdom database */
 479
 480 #define MAX_GETPWENT_USERS 500
 481
 482 enum winbindd_result winbindd_getpwent(struct winbindd_cli_state *state)
 483 {
 484         struct getent_state *ent;
 485         struct winbindd_pw *user_list;
 486         int num_users, user_list_ndx = 0, i;
 487
 488         DEBUG(3, ("[%5lu]: getpwent\n", (unsigned long)state->pid));
 489
 490         /* Check user has enabled this */
 491
 492         if (!lp_winbind_enum_users())
 493                 return WINBINDD_ERROR;
 494
 495         /* Allocate space for returning a chunk of users */
 496
 497         num_users = MIN(MAX_GETPWENT_USERS, state->request.data.num_entries);
 498
 499         if ((state->response.extra_data =
 500              malloc(num_users * sizeof(struct winbindd_pw))) == NULL)
 501                 return WINBINDD_ERROR;
 502
 503         memset(state->response.extra_data, 0, num_users *
 504                sizeof(struct winbindd_pw));
 505
 506         user_list = (struct winbindd_pw *)state->response.extra_data;
 507
 508         if (!state->getpwent_initialized)
 509                 winbindd_setpwent(state);
 510
 511         if (!(ent = state->getpwent_state))
 512                 return WINBINDD_ERROR;
 513
 514         /* Start sending back users */
 515
 516         for (i = 0; i < num_users; i++) {
 517                 struct getpwent_user *name_list = NULL;
 518                 uint32 result;
 519
 520                 /* Do we need to fetch another chunk of users? */
 521
 522                 if (ent->num_sam_entries == ent->sam_entry_index) {
 523
 524                         while(ent && !get_sam_user_entries(ent)) {
 525                                 struct getent_state *next_ent;
 526
 527                                 /* Free state information for this domain */
 528
 529                                 SAFE_FREE(ent->sam_entries);
 530
 531                                 next_ent = ent->next;
 532                                 DLIST_REMOVE(state->getpwent_state, ent);
 533
 534                                 SAFE_FREE(ent);
 535                                 ent = next_ent;
 536                         }
 537
 538                         /* No more domains */
 539
 540                         if (!ent)
 541                                 break;
 542                 }
 543
 544                 name_list = ent->sam_entries;
 545
 546                 /* Lookup user info */
 547
 548                 result = winbindd_fill_pwent(
 549                         ent->domain_name,
 550                         name_list[ent->sam_entry_index].name,
 551                         &name_list[ent->sam_entry_index].user_sid,
 552                         &name_list[ent->sam_entry_index].group_sid,
 553                         name_list[ent->sam_entry_index].gecos,
 554                         &user_list[user_list_ndx]);
 555
 556                 ent->sam_entry_index++;
 557
 558                 /* Add user to return list */
 559
 560                 if (result) {
 561
 562                         user_list_ndx++;
 563                         state->response.data.num_entries++;
 564                         state->response.length +=
 565                                 sizeof(struct winbindd_pw);
 566
 567                 } else
 568                         DEBUG(1, ("could not lookup domain user %s\n",
 569                                   name_list[ent->sam_entry_index].name));
 570         }
 571
 572         /* Out of domains */
 573
 574         return (user_list_ndx > 0) ? WINBINDD_OK : WINBINDD_ERROR;
 575 }
 576
 577 /* List domain users without mapping to unix ids */
 578
 579 enum winbindd_result winbindd_list_users(struct winbindd_cli_state *state)
 580 {
 581         struct winbindd_domain *domain;
 582         WINBIND_USERINFO *info;
 583         const char *which_domain;
 584         uint32 num_entries = 0, total_entries = 0;
 585         char *ted, *extra_data = NULL;
 586         int extra_data_len = 0;
 587         TALLOC_CTX *mem_ctx;
 588         enum winbindd_result rv = WINBINDD_ERROR;
 589
 590         DEBUG(3, ("[%5lu]: list users\n", (unsigned long)state->pid));
 591
 592         if (!(mem_ctx = talloc_init("winbindd_list_users")))
 593                 return WINBINDD_ERROR;
 594
 595         /* Ensure null termination */
 596         state->request.domain_name[sizeof(state->request.domain_name)-1]='\0';
 597         which_domain = state->request.domain_name;
 598
 599         /* Enumerate over trusted domains */
 600
 601         for (domain = domain_list(); domain; domain = domain->next) {
 602                 NTSTATUS status;
 603                 struct winbindd_methods *methods;
 604                 unsigned int i;
 605
 606                 /* if we have a domain name restricting the request and this
 607                    one in the list doesn't match, then just bypass the remainder
 608                    of the loop */
 609
 610                 if ( *which_domain && !strequal(which_domain, domain->name) )
 611                         continue;
 612
 613                 methods = domain->methods;
 614
 615                 /* Query display info */
 616                 status = methods->query_user_list(domain, mem_ctx,
 617                                                   &num_entries, &info);
 618
 619                 if (num_entries == 0)
 620                         continue;
 621
 622                 /* Allocate some memory for extra data */
 623                 total_entries += num_entries;
 624
 625                 ted = Realloc(extra_data, sizeof(fstring) * total_entries);
 626
 627                 if (!ted) {
 628                         DEBUG(0,("failed to enlarge buffer!\n"));
 629                         SAFE_FREE(extra_data);
 630                         goto done;
 631                 } else
 632                         extra_data = ted;
 633
 634                 /* Pack user list into extra data fields */
 635
 636                 for (i = 0; i < num_entries; i++) {
 637                         fstring acct_name, name;
 638
 639                         if (!info[i].acct_name) {
 640                                 fstrcpy(acct_name, "");
 641                         } else {
 642                                 fstrcpy(acct_name, info[i].acct_name);
 643                         }
 644
 645                         fill_domain_username(name, domain->name, acct_name);
 646
 647                                 /* Append to extra data */
 648                         memcpy(&extra_data[extra_data_len], name,
 649                                strlen(name));
 650                         extra_data_len += strlen(name);
 651                         extra_data[extra_data_len++] = ',';
 652                 }
 653         }
 654
 655         /* Assign extra_data fields in response structure */
 656
 657         if (extra_data) {
 658                 extra_data[extra_data_len - 1] = '\0';
 659                 state->response.extra_data = extra_data;
 660                 state->response.length += extra_data_len;
 661         }
 662
 663         /* No domains responded but that's still OK so don't return an
 664            error. */
 665
 666         rv = WINBINDD_OK;
 667
 668  done:
 669
 670         talloc_destroy(mem_ctx);
 671
 672         return rv;
 673 }