source/nsswitch/winbindd_user.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 2.2
   4
   5    Winbind daemon - user related functions
   6
   7    Copyright (C) Tim Potter 2000
   8    Copyright (C) Jeremy Allison 2001.
   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 "winbindd.h"
  26
  27 /* Fill a pwent structure with information we have obtained */
  28
  29 static BOOL winbindd_fill_pwent(char *dom_name, char *user_name,
  30                                 uint32 user_rid, uint32 group_rid,
  31                                 char *full_name, struct winbindd_pw *pw)
  32 {
  33         extern userdom_struct current_user_info;
  34         fstring output_username;
  35         pstring homedir;
  36
  37         if (!pw || !dom_name || !user_name)
  38                 return False;
  39
  40         /* Resolve the uid number */
  41
  42         if (!winbindd_idmap_get_uid_from_rid(dom_name, user_rid,
  43                                              &pw->pw_uid)) {
  44                 DEBUG(1, ("error getting user id for rid %d\n", user_rid));
  45                 return False;
  46         }
  47
  48         /* Resolve the gid number */
  49
  50         if (!winbindd_idmap_get_gid_from_rid(dom_name, group_rid,
  51                                              &pw->pw_gid)) {
  52                 DEBUG(1, ("error getting group id for rid %d\n", group_rid));
  53                 return False;
  54         }
  55
  56         /* Username */
  57
  58         fill_domain_username(output_username, dom_name, user_name);
  59
  60         safe_strcpy(pw->pw_name, output_username, sizeof(pw->pw_name) - 1);
  61
  62         /* Full name (gecos) */
  63
  64         safe_strcpy(pw->pw_gecos, full_name, sizeof(pw->pw_gecos) - 1);
  65
  66         /* Home directory and shell - use template config parameters.  The
  67            defaults are /tmp for the home directory and /bin/false for
  68            shell. */
  69
  70         /* The substitution of %U and %D in the 'template homedir' is done
  71            by lp_string() calling standard_sub_basic(). */
  72
  73         fstrcpy(current_user_info.smb_name, user_name);
  74         fstrcpy(current_user_info.domain, dom_name);
  75
  76         pstrcpy(homedir, lp_template_homedir());
  77
  78         safe_strcpy(pw->pw_dir, homedir, sizeof(pw->pw_dir) - 1);
  79
  80         safe_strcpy(pw->pw_shell, lp_template_shell(),
  81                     sizeof(pw->pw_shell) - 1);
  82
  83         /* Password - set to "x" as we can't generate anything useful here.
  84            Authentication can be done using the pam_winbind module. */
  85
  86         safe_strcpy(pw->pw_passwd, "x", sizeof(pw->pw_passwd) - 1);
  87
  88         return True;
  89 }
  90
  91 /* Return a password structure from a username.  */
  92
  93 enum winbindd_result winbindd_getpwnam(struct winbindd_cli_state *state)
  94 {
  95         uint32 user_rid;
  96         WINBIND_USERINFO user_info;
  97         DOM_SID user_sid;
  98         NTSTATUS status;
  99         fstring name_domain, name_user;
 100         enum SID_NAME_USE name_type;
 101         struct winbindd_domain *domain;
 102         TALLOC_CTX *mem_ctx;
 103
 104         DEBUG(3, ("[%5d]: getpwnam %s\n", state->pid,
 105                   state->request.data.username));
 106
 107         /* Parse domain and username */
 108
 109         if (!parse_domain_user(state->request.data.username, name_domain,
 110                                name_user))
 111                 return WINBINDD_ERROR;
 112
 113         if ((domain = find_domain_from_name(name_domain)) == NULL) {
 114                 DEBUG(5, ("no such domain: %s\n", name_domain));
 115                 return WINBINDD_ERROR;
 116         }
 117
 118         /* Get rid and name type from name */
 119
 120         if (!winbindd_lookup_sid_by_name(domain, name_user, &user_sid, &name_type)) {
 121                 DEBUG(1, ("user '%s' does not exist\n", name_user));
 122                 return WINBINDD_ERROR;
 123         }
 124
 125         if (name_type != SID_NAME_USER) {
 126                 DEBUG(1, ("name '%s' is not a user name: %d\n", name_user,
 127                           name_type));
 128                 return WINBINDD_ERROR;
 129         }
 130
 131         /* Get some user info.  Split the user rid from the sid obtained
 132            from the winbind_lookup_by_name() call and use it in a
 133            winbind_lookup_userinfo() */
 134
 135         if (!(mem_ctx = talloc_init_named("winbindd_getpwnam([%s]\\[%s])",
 136                                           name_domain, name_user))) {
 137                 DEBUG(1, ("out of memory\n"));
 138                 return WINBINDD_ERROR;
 139         }
 140
 141         sid_split_rid(&user_sid, &user_rid);
 142
 143         status = domain->methods->query_user(domain, mem_ctx, user_rid,
 144                                              &user_info);
 145
 146         if (!NT_STATUS_IS_OK(status)) {
 147                 DEBUG(1, ("error getting user info for user '[%s]\\[%s]'\n",
 148                           name_domain, name_user));
 149                 talloc_destroy(mem_ctx);
 150                 return WINBINDD_ERROR;
 151         }
 152
 153         /* Now take all this information and fill in a passwd structure */
 154         if (!winbindd_fill_pwent(name_domain, name_user,
 155                                  user_rid, user_info.group_rid,
 156                                  user_info.full_name,
 157                                  &state->response.data.pw)) {
 158                 talloc_destroy(mem_ctx);
 159                 return WINBINDD_ERROR;
 160         }
 161
 162         talloc_destroy(mem_ctx);
 163
 164         return WINBINDD_OK;
 165 }
 166
 167 /* Return a password structure given a uid number */
 168
 169 enum winbindd_result winbindd_getpwuid(struct winbindd_cli_state *state)
 170 {
 171         DOM_SID user_sid;
 172         struct winbindd_domain *domain;
 173         uint32 user_rid;
 174         fstring dom_name;
 175         fstring user_name;
 176         enum SID_NAME_USE name_type;
 177         WINBIND_USERINFO user_info;
 178         gid_t gid;
 179         TALLOC_CTX *mem_ctx;
 180         NTSTATUS status;
 181
 182         /* Bug out if the uid isn't in the winbind range */
 183
 184         if ((state->request.data.uid < server_state.uid_low ) ||
 185             (state->request.data.uid > server_state.uid_high))
 186                 return WINBINDD_ERROR;
 187
 188         DEBUG(3, ("[%5d]: getpwuid %d\n", state->pid,
 189                   state->request.data.uid));
 190
 191         /* Get rid from uid */
 192
 193         if (!winbindd_idmap_get_rid_from_uid(state->request.data.uid,
 194                                              &user_rid, &domain)) {
 195                 DEBUG(1, ("could not convert uid %d to rid\n",
 196                           state->request.data.uid));
 197                 return WINBINDD_ERROR;
 198         }
 199
 200         /* Get name and name type from rid */
 201
 202         sid_copy(&user_sid, &domain->sid);
 203         sid_append_rid(&user_sid, user_rid);
 204
 205         if (!winbindd_lookup_name_by_sid(&user_sid, dom_name, user_name, &name_type)) {
 206                 fstring temp;
 207
 208                 sid_to_string(temp, &user_sid);
 209                 DEBUG(1, ("could not lookup sid %s\n", temp));
 210                 return WINBINDD_ERROR;
 211         }
 212
 213         /* Get some user info */
 214
 215         if (!(mem_ctx = talloc_init_named("winbind_getpwuid(%d)",
 216                                           state->request.data.uid))) {
 217
 218                 DEBUG(1, ("out of memory\n"));
 219                 return WINBINDD_ERROR;
 220         }
 221
 222         status = domain->methods->query_user(domain, mem_ctx, user_rid,
 223                                              &user_info);
 224
 225         if (!NT_STATUS_IS_OK(status)) {
 226                 DEBUG(1, ("error getting user info for user '%s'\n",
 227                           user_name));
 228                 talloc_destroy(mem_ctx);
 229                 return WINBINDD_ERROR;
 230         }
 231
 232         /* Resolve gid number */
 233
 234         if (!winbindd_idmap_get_gid_from_rid(domain->name, user_info.group_rid, &gid)) {
 235                 DEBUG(1, ("error getting group id for user %s\n", user_name));
 236                 talloc_destroy(mem_ctx);
 237                 return WINBINDD_ERROR;
 238         }
 239
 240         /* Fill in password structure */
 241
 242         if (!winbindd_fill_pwent(domain->name, user_name, user_rid, user_info.group_rid,
 243                                  user_info.full_name, &state->response.data.pw)) {
 244                 talloc_destroy(mem_ctx);
 245                 return WINBINDD_ERROR;
 246         }
 247
 248         talloc_destroy(mem_ctx);
 249
 250         return WINBINDD_OK;
 251 }
 252
 253 /*
 254  * set/get/endpwent functions
 255  */
 256
 257 /* Rewind file pointer for ntdom passwd database */
 258
 259 enum winbindd_result winbindd_setpwent(struct winbindd_cli_state *state)
 260 {
 261         struct winbindd_domain *domain;
 262
 263         DEBUG(3, ("[%5d]: setpwent\n", state->pid));
 264
 265         /* Check user has enabled this */
 266
 267         if (!lp_winbind_enum_users())
 268                 return WINBINDD_ERROR;
 269
 270         /* Free old static data if it exists */
 271
 272         if (state->getpwent_state != NULL) {
 273                 free_getent_state(state->getpwent_state);
 274                 state->getpwent_state = NULL;
 275         }
 276
 277         /* Create sam pipes for each domain we know about */
 278
 279         for(domain = domain_list(); domain != NULL; domain = domain->next) {
 280                 struct getent_state *domain_state;
 281
 282                 /*
 283                  * Skip domains other than WINBINDD_DOMAIN environment
 284                  * variable.
 285                  */
 286
 287                 if ((strcmp(state->request.domain, "") != 0) &&
 288                                 !check_domain_env(state->request.domain,
 289                                                   domain->name))
 290                         continue;
 291
 292                 /* Create a state record for this domain */
 293
 294                 if ((domain_state = (struct getent_state *)
 295                      malloc(sizeof(struct getent_state))) == NULL)
 296                         return WINBINDD_ERROR;
 297
 298                 ZERO_STRUCTP(domain_state);
 299
 300                 fstrcpy(domain_state->domain_name, domain->name);
 301
 302                 /* Add to list of open domains */
 303
 304                 DLIST_ADD(state->getpwent_state, domain_state);
 305         }
 306
 307         return WINBINDD_OK;
 308 }
 309
 310 /* Close file pointer to ntdom passwd database */
 311
 312 enum winbindd_result winbindd_endpwent(struct winbindd_cli_state *state)
 313 {
 314         DEBUG(3, ("[%5d]: endpwent\n", state->pid));
 315
 316         free_getent_state(state->getpwent_state);
 317         state->getpwent_state = NULL;
 318
 319         return WINBINDD_OK;
 320 }
 321
 322 /* Get partial list of domain users for a domain.  We fill in the sam_entries,
 323    and num_sam_entries fields with domain user information.  The dispinfo_ndx
 324    field is incremented to the index of the next user to fetch.  Return True if
 325    some users were returned, False otherwise. */
 326
 327 #define MAX_FETCH_SAM_ENTRIES 100
 328
 329 static BOOL get_sam_user_entries(struct getent_state *ent)
 330 {
 331         NTSTATUS status;
 332         uint32 num_entries;
 333         WINBIND_USERINFO *info;
 334         struct getpwent_user *name_list = NULL;
 335         BOOL result = False;
 336         TALLOC_CTX *mem_ctx;
 337         struct winbindd_domain *domain;
 338         struct winbindd_methods *methods;
 339         int i;
 340
 341         if (ent->num_sam_entries)
 342                 return False;
 343
 344         if (!(mem_ctx = talloc_init_named("get_sam_user_entries(%s)",
 345                                           ent->domain_name)))
 346                 return False;
 347
 348         if (!(domain = find_domain_from_name(ent->domain_name))) {
 349                 DEBUG(3, ("no such domain %s in get_sam_user_entries\n",
 350                           ent->domain_name));
 351                 return False;
 352         }
 353
 354         methods = domain->methods;
 355
 356         /* Free any existing user info */
 357
 358         SAFE_FREE(ent->sam_entries);
 359         ent->num_sam_entries = 0;
 360
 361         /* Call query_user_list to get a list of usernames and user rids */
 362
 363         num_entries = 0;
 364
 365         status = methods->query_user_list(domain, mem_ctx, &num_entries,
 366                                           &info);
 367
 368         if (num_entries) {
 369                 struct getpwent_user *tnl;
 370
 371                 tnl = (struct getpwent_user *)Realloc(name_list,
 372                                                       sizeof(struct getpwent_user) *
 373                                                       (ent->num_sam_entries +
 374                                                        num_entries));
 375
 376                 if (!tnl) {
 377                         DEBUG(0,("get_sam_user_entries realloc failed.\n"));
 378                         SAFE_FREE(name_list);
 379                         goto done;
 380                 } else
 381                         name_list = tnl;
 382         }
 383
 384         for (i = 0; i < num_entries; i++) {
 385                 /* Store account name and gecos */
 386                 if (!info[i].acct_name) {
 387                         fstrcpy(name_list[ent->num_sam_entries + i].name, "");
 388                 } else {
 389                         fstrcpy(name_list[ent->num_sam_entries + i].name,
 390                                 info[i].acct_name);
 391                 }
 392                 if (!info[i].full_name) {
 393                         fstrcpy(name_list[ent->num_sam_entries + i].gecos, "");
 394                 } else {
 395                         fstrcpy(name_list[ent->num_sam_entries + i].gecos,
 396                                 info[i].full_name);
 397                 }
 398
 399                 /* User and group ids */
 400                 name_list[ent->num_sam_entries+i].user_rid = info[i].user_rid;
 401                 name_list[ent->num_sam_entries+i].group_rid = info[i].group_rid;
 402         }
 403
 404         ent->num_sam_entries += num_entries;
 405
 406         /* Fill in remaining fields */
 407
 408         ent->sam_entries = name_list;
 409         ent->sam_entry_index = 0;
 410         result = ent->num_sam_entries > 0;
 411
 412  done:
 413
 414         talloc_destroy(mem_ctx);
 415
 416         return result;
 417 }
 418
 419 /* Fetch next passwd entry from ntdom database */
 420
 421 #define MAX_GETPWENT_USERS 500
 422
 423 enum winbindd_result winbindd_getpwent(struct winbindd_cli_state *state)
 424 {
 425         struct getent_state *ent;
 426         struct winbindd_pw *user_list;
 427         int num_users, user_list_ndx = 0, i;
 428
 429         DEBUG(3, ("[%5d]: getpwent\n", state->pid));
 430
 431         /* Check user has enabled this */
 432
 433         if (!lp_winbind_enum_users())
 434                 return WINBINDD_ERROR;
 435
 436         /* Allocate space for returning a chunk of users */
 437
 438         num_users = MIN(MAX_GETPWENT_USERS, state->request.data.num_entries);
 439
 440         if ((state->response.extra_data =
 441              malloc(num_users * sizeof(struct winbindd_pw))) == NULL)
 442                 return WINBINDD_ERROR;
 443
 444         memset(state->response.extra_data, 0, num_users *
 445                sizeof(struct winbindd_pw));
 446
 447         user_list = (struct winbindd_pw *)state->response.extra_data;
 448
 449         if (!(ent = state->getpwent_state))
 450                 return WINBINDD_ERROR;
 451
 452         /* Start sending back users */
 453
 454         for (i = 0; i < num_users; i++) {
 455                 struct getpwent_user *name_list = NULL;
 456                 fstring domain_user_name;
 457                 uint32 result;
 458
 459                 /* Do we need to fetch another chunk of users? */
 460
 461                 if (ent->num_sam_entries == ent->sam_entry_index) {
 462
 463                         while(ent && !get_sam_user_entries(ent)) {
 464                                 struct getent_state *next_ent;
 465
 466                                 /* Free state information for this domain */
 467
 468                                 SAFE_FREE(ent->sam_entries);
 469
 470                                 next_ent = ent->next;
 471                                 DLIST_REMOVE(state->getpwent_state, ent);
 472
 473                                 SAFE_FREE(ent);
 474                                 ent = next_ent;
 475                         }
 476
 477                         /* No more domains */
 478
 479                         if (!ent)
 480                                 break;
 481                 }
 482
 483                 name_list = ent->sam_entries;
 484
 485                 /* Skip machine accounts */
 486
 487                 if (name_list[ent->sam_entry_index].
 488                     name[strlen(name_list[ent->sam_entry_index].name) - 1]
 489                     == '$') {
 490                         ent->sam_entry_index++;
 491                         continue;
 492                 }
 493
 494                 /* Lookup user info */
 495
 496                 result = winbindd_fill_pwent(
 497                         ent->domain_name,
 498                         name_list[ent->sam_entry_index].name,
 499                         name_list[ent->sam_entry_index].user_rid,
 500                         name_list[ent->sam_entry_index].group_rid,
 501                         name_list[ent->sam_entry_index].gecos,
 502                         &user_list[user_list_ndx]);
 503
 504                 ent->sam_entry_index++;
 505
 506                 /* Add user to return list */
 507
 508                 if (result) {
 509
 510                         user_list_ndx++;
 511                         state->response.data.num_entries++;
 512                         state->response.length +=
 513                                 sizeof(struct winbindd_pw);
 514
 515                 } else
 516                         DEBUG(1, ("could not lookup domain user %s\n",
 517                                   domain_user_name));
 518         }
 519
 520         /* Out of domains */
 521
 522         return (user_list_ndx > 0) ? WINBINDD_OK : WINBINDD_ERROR;
 523 }
 524
 525 /* List domain users without mapping to unix ids */
 526
 527 enum winbindd_result winbindd_list_users(struct winbindd_cli_state *state)
 528 {
 529         struct winbindd_domain *domain;
 530         WINBIND_USERINFO *info;
 531         uint32 num_entries = 0, total_entries = 0;
 532         char *ted, *extra_data = NULL;
 533         int extra_data_len = 0;
 534         TALLOC_CTX *mem_ctx;
 535         enum winbindd_result rv = WINBINDD_ERROR;
 536
 537         DEBUG(3, ("[%5d]: list users\n", state->pid));
 538
 539         if (!(mem_ctx = talloc_init_named("winbindd_list_users")))
 540                 return WINBINDD_ERROR;
 541
 542         /* Enumerate over trusted domains */
 543
 544         for (domain = domain_list(); domain; domain = domain->next) {
 545                 NTSTATUS status;
 546                 struct winbindd_methods *methods;
 547                 int i;
 548
 549                 /* Skip domains other than WINBINDD_DOMAIN environment
 550                    variable */
 551
 552                 if ((strcmp(state->request.domain, "") != 0) &&
 553                     !check_domain_env(state->request.domain, domain->name))
 554                         continue;
 555
 556                 methods = domain->methods;
 557
 558                 /* Query display info */
 559                 status = methods->query_user_list(domain, mem_ctx,
 560                                                   &num_entries, &info);
 561
 562                 if (num_entries == 0)
 563                         continue;
 564
 565                 /* Allocate some memory for extra data */
 566                 total_entries += num_entries;
 567
 568                 ted = Realloc(extra_data, sizeof(fstring) * total_entries);
 569
 570                 if (!ted) {
 571                         DEBUG(0,("failed to enlarge buffer!\n"));
 572                         SAFE_FREE(extra_data);
 573                         goto done;
 574                 } else
 575                         extra_data = ted;
 576
 577                 /* Pack user list into extra data fields */
 578
 579                 for (i = 0; i < num_entries; i++) {
 580                         fstring acct_name, name;
 581
 582                         if (!info[i].acct_name) {
 583                                 fstrcpy(acct_name, "");
 584                         } else {
 585                                 fstrcpy(acct_name, info[i].acct_name);
 586                         }
 587
 588                         fill_domain_username(name, domain->name, acct_name);
 589
 590                                 /* Append to extra data */
 591                         memcpy(&extra_data[extra_data_len], name,
 592                                strlen(name));
 593                         extra_data_len += strlen(name);
 594                         extra_data[extra_data_len++] = ',';
 595                 }
 596         }
 597
 598         /* Assign extra_data fields in response structure */
 599
 600         if (extra_data) {
 601                 extra_data[extra_data_len - 1] = '\0';
 602                 state->response.extra_data = extra_data;
 603                 state->response.length += extra_data_len;
 604         }
 605
 606         /* No domains responded but that's still OK so don't return an
 607            error. */
 608
 609         rv = WINBINDD_OK;
 610
 611  done:
 612
 613         talloc_destroy(mem_ctx);
 614
 615         return rv;
 616 }