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lib/util/util_pw: share sys_get{pw,gr} group of calls.
[Samba.git] / source3 / auth / token_util.c
blobf88511d8d634893c47e50d1bf587c495cd0abd80
1 /*
2 * Unix SMB/CIFS implementation.
3 * Authentication utility functions
4 * Copyright (C) Andrew Tridgell 1992-1998
5 * Copyright (C) Andrew Bartlett 2001
6 * Copyright (C) Jeremy Allison 2000-2001
7 * Copyright (C) Rafal Szczesniak 2002
8 * Copyright (C) Volker Lendecke 2006
9 * Copyright (C) Michael Adam 2007
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 3 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, see <http://www.gnu.org/licenses/>.
23 */
24
25 /* functions moved from auth/auth_util.c to minimize linker deps */
26
27 #include "includes.h"
28 #include "secrets.h"
29 #include "memcache.h"
30 #include "../librpc/gen_ndr/netlogon.h"
31 #include "../libcli/security/security.h"
32 #include "../lib/util/util_pw.h"
33
34 /****************************************************************************
35 Check for a SID in an struct security_token
36 ****************************************************************************/
37
38 bool nt_token_check_sid ( const struct dom_sid *sid, const struct security_token *token )
39 {
40 if ( !sid || !token )
41 return False;
42
43 return security_token_has_sid(token, sid);
44 }
45
46 bool nt_token_check_domain_rid( struct security_token *token, uint32 rid )
47 {
48 struct dom_sid domain_sid;
49
50 /* if we are a domain member, the get the domain SID, else for
51 a DC or standalone server, use our own SID */
52
53 if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
54 if ( !secrets_fetch_domain_sid( lp_workgroup(),
55 &domain_sid ) ) {
56 DEBUG(1,("nt_token_check_domain_rid: Cannot lookup "
57 "SID for domain [%s]\n", lp_workgroup()));
58 return False;
59 }
60 }
61 else
62 sid_copy( &domain_sid, get_global_sam_sid() );
63
64 sid_append_rid( &domain_sid, rid );
65
66 return nt_token_check_sid( &domain_sid, token );\
67 }
68
69 /******************************************************************************
70 Create a token for the root user to be used internally by smbd.
71 This is similar to running under the context of the LOCAL_SYSTEM account
72 in Windows. This is a read-only token. Do not modify it or free() it.
73 Create a copy if you need to change it.
74 ******************************************************************************/
75
76 struct security_token *get_root_nt_token( void )
77 {
78 struct security_token *token, *for_cache;
79 struct dom_sid u_sid, g_sid;
80 struct passwd *pw;
81 void *cache_data;
82
83 cache_data = memcache_lookup_talloc(
84 NULL, SINGLETON_CACHE_TALLOC,
85 data_blob_string_const_null("root_nt_token"));
86
87 if (cache_data != NULL) {
88 return talloc_get_type_abort(
89 cache_data, struct security_token);
90 }
91
92 if ( !(pw = sys_getpwuid(0)) ) {
93 if ( !(pw = sys_getpwnam("root")) ) {
94 DEBUG(0,("get_root_nt_token: both sys_getpwuid(0) "
95 "and sys_getpwnam(\"root\") failed!\n"));
96 return NULL;
97 }
98 }
99
100 /* get the user and primary group SIDs; although the
101 BUILTIN\Administrators SId is really the one that matters here */
102
103 uid_to_sid(&u_sid, pw->pw_uid);
104 gid_to_sid(&g_sid, pw->pw_gid);
105
106 token = create_local_nt_token(talloc_tos(), &u_sid, False,
107 1, &global_sid_Builtin_Administrators);
108
109 security_token_set_privilege(token, SEC_PRIV_DISK_OPERATOR);
110
111 for_cache = token;
112
113 memcache_add_talloc(
114 NULL, SINGLETON_CACHE_TALLOC,
115 data_blob_string_const_null("root_nt_token"), &for_cache);
116
117 return token;
118 }
119
120
121 /*
122 * Add alias SIDs from memberships within the partially created token SID list
123 */
124
125 NTSTATUS add_aliases(const struct dom_sid *domain_sid,
126 struct security_token *token)
127 {
128 uint32 *aliases;
129 size_t i, num_aliases;
130 NTSTATUS status;
131 TALLOC_CTX *tmp_ctx;
132
133 if (!(tmp_ctx = talloc_init("add_aliases"))) {
134 return NT_STATUS_NO_MEMORY;
135 }
136
137 aliases = NULL;
138 num_aliases = 0;
139
140 status = pdb_enum_alias_memberships(tmp_ctx, domain_sid,
141 token->sids,
142 token->num_sids,
143 &aliases, &num_aliases);
144
145 if (!NT_STATUS_IS_OK(status)) {
146 DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n",
147 nt_errstr(status)));
148 goto done;
149 }
150
151 for (i=0; i<num_aliases; i++) {
152 struct dom_sid alias_sid;
153 sid_compose(&alias_sid, domain_sid, aliases[i]);
154 status = add_sid_to_array_unique(token, &alias_sid,
155 &token->sids,
156 &token->num_sids);
157 if (!NT_STATUS_IS_OK(status)) {
158 DEBUG(0, ("add_sid_to_array failed\n"));
159 goto done;
160 }
161 }
162
163 done:
164 TALLOC_FREE(tmp_ctx);
165 return NT_STATUS_OK;
166 }
167
168 /*******************************************************************
169 *******************************************************************/
170
171 static NTSTATUS add_builtin_administrators(struct security_token *token,
172 const struct dom_sid *dom_sid)
173 {
174 struct dom_sid domadm;
175 NTSTATUS status;
176
177 /* nothing to do if we aren't in a domain */
178
179 if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) {
180 return NT_STATUS_OK;
181 }
182
183 /* Find the Domain Admins SID */
184
185 if ( IS_DC ) {
186 sid_copy( &domadm, get_global_sam_sid() );
187 } else {
188 sid_copy(&domadm, dom_sid);
189 }
190 sid_append_rid( &domadm, DOMAIN_RID_ADMINS );
191
192 /* Add Administrators if the user beloongs to Domain Admins */
193
194 if ( nt_token_check_sid( &domadm, token ) ) {
195 status = add_sid_to_array(token,
196 &global_sid_Builtin_Administrators,
197 &token->sids, &token->num_sids);
198 if (!NT_STATUS_IS_OK(status)) {
199 return status;
200 }
201 }
202
203 return NT_STATUS_OK;
204 }
205
206 /**
207 * Create the requested BUILTIN if it doesn't already exist. This requires
208 * winbindd to be running.
209 *
210 * @param[in] rid BUILTIN rid to create
211 * @return Normal NTSTATUS return.
212 */
213 static NTSTATUS create_builtin(uint32 rid)
214 {
215 NTSTATUS status = NT_STATUS_OK;
216 struct dom_sid sid;
217 gid_t gid;
218
219 if (!sid_compose(&sid, &global_sid_Builtin, rid)) {
220 return NT_STATUS_NO_SUCH_ALIAS;
221 }
222
223 if (!sid_to_gid(&sid, &gid)) {
224 if (!lp_winbind_nested_groups() || !winbind_ping()) {
225 return NT_STATUS_PROTOCOL_UNREACHABLE;
226 }
227 status = pdb_create_builtin_alias(rid);
228 }
229 return status;
230 }
231
232 /**
233 * Add sid as a member of builtin_sid.
234 *
235 * @param[in] builtin_sid An existing builtin group.
236 * @param[in] dom_sid sid to add as a member of builtin_sid.
237 * @return Normal NTSTATUS return
238 */
239 static NTSTATUS add_sid_to_builtin(const struct dom_sid *builtin_sid,
240 const struct dom_sid *dom_sid)
241 {
242 NTSTATUS status = NT_STATUS_OK;
243
244 if (!dom_sid || !builtin_sid) {
245 return NT_STATUS_INVALID_PARAMETER;
246 }
247
248 status = pdb_add_aliasmem(builtin_sid, dom_sid);
249
250 if (NT_STATUS_EQUAL(status, NT_STATUS_MEMBER_IN_ALIAS)) {
251 DEBUG(5, ("add_sid_to_builtin %s is already a member of %s\n",
252 sid_string_dbg(dom_sid),
253 sid_string_dbg(builtin_sid)));
254 return NT_STATUS_OK;
255 }
256
257 if (!NT_STATUS_IS_OK(status)) {
258 DEBUG(4, ("add_sid_to_builtin %s could not be added to %s: "
259 "%s\n", sid_string_dbg(dom_sid),
260 sid_string_dbg(builtin_sid), nt_errstr(status)));
261 }
262 return status;
263 }
264
265 /*******************************************************************
266 *******************************************************************/
267
268 NTSTATUS create_builtin_users(const struct dom_sid *dom_sid)
269 {
270 NTSTATUS status;
271 struct dom_sid dom_users;
272
273 status = create_builtin(BUILTIN_RID_USERS);
274 if ( !NT_STATUS_IS_OK(status) ) {
275 DEBUG(5,("create_builtin_users: Failed to create Users\n"));
276 return status;
277 }
278
279 /* add domain users */
280 if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
281 && sid_compose(&dom_users, dom_sid, DOMAIN_RID_USERS))
282 {
283 status = add_sid_to_builtin(&global_sid_Builtin_Users,
284 &dom_users);
285 }
286
287 return status;
288 }
289
290 /*******************************************************************
291 *******************************************************************/
292
293 NTSTATUS create_builtin_administrators(const struct dom_sid *dom_sid)
294 {
295 NTSTATUS status;
296 struct dom_sid dom_admins, root_sid;
297 fstring root_name;
298 enum lsa_SidType type;
299 TALLOC_CTX *ctx;
300 bool ret;
301
302 status = create_builtin(BUILTIN_RID_ADMINISTRATORS);
303 if ( !NT_STATUS_IS_OK(status) ) {
304 DEBUG(5,("create_builtin_administrators: Failed to create Administrators\n"));
305 return status;
306 }
307
308 /* add domain admins */
309 if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
310 && sid_compose(&dom_admins, dom_sid, DOMAIN_RID_ADMINS))
311 {
312 status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
313 &dom_admins);
314 if (!NT_STATUS_IS_OK(status)) {
315 return status;
316 }
317 }
318
319 /* add root */
320 if ( (ctx = talloc_init("create_builtin_administrators")) == NULL ) {
321 return NT_STATUS_NO_MEMORY;
322 }
323 fstr_sprintf( root_name, "%s\\root", get_global_sam_name() );
324 ret = lookup_name(ctx, root_name, LOOKUP_NAME_DOMAIN, NULL, NULL,
325 &root_sid, &type);
326 TALLOC_FREE( ctx );
327
328 if ( ret ) {
329 status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
330 &root_sid);
331 }
332
333 return status;
334 }
335
336 static NTSTATUS finalize_local_nt_token(struct security_token *result,
337 bool is_guest);
338
339 NTSTATUS create_local_nt_token_from_info3(TALLOC_CTX *mem_ctx,
340 bool is_guest,
341 struct netr_SamInfo3 *info3,
342 struct extra_auth_info *extra,
343 struct security_token **ntok)
344 {
345 struct security_token *usrtok = NULL;
346 NTSTATUS status;
347 int i;
348
349 DEBUG(10, ("Create local NT token for %s\n",
350 info3->base.account_name.string));
351
352 usrtok = talloc_zero(mem_ctx, struct security_token);
353 if (!usrtok) {
354 DEBUG(0, ("talloc failed\n"));
355 return NT_STATUS_NO_MEMORY;
356 }
357
358 /* Add the user and primary group sid FIRST */
359 /* check if the user rid is the special "Domain Guests" rid.
360 * If so pick the first sid for the extra sids instead as it
361 * is a local fake account */
362 usrtok->sids = talloc_array(usrtok, struct dom_sid, 2);
363 if (!usrtok->sids) {
364 TALLOC_FREE(usrtok);
365 return NT_STATUS_NO_MEMORY;
366 }
367 usrtok->num_sids = 2;
368
369 /* USER SID */
370 if (info3->base.rid == (uint32_t)(-1)) {
371 /* this is a signal the user was fake and generated,
372 * the actual SID we want to use is stored in the extra
373 * sids */
374 if (is_null_sid(&extra->user_sid)) {
375 /* we couldn't find the user sid, bail out */
376 DEBUG(3, ("Invalid user SID\n"));
377 TALLOC_FREE(usrtok);
378 return NT_STATUS_UNSUCCESSFUL;
379 }
380 sid_copy(&usrtok->sids[0], &extra->user_sid);
381 } else {
382 sid_copy(&usrtok->sids[0], info3->base.domain_sid);
383 sid_append_rid(&usrtok->sids[0], info3->base.rid);
384 }
385
386 /* GROUP SID */
387 if (info3->base.primary_gid == (uint32_t)(-1)) {
388 /* this is a signal the user was fake and generated,
389 * the actual SID we want to use is stored in the extra
390 * sids */
391 if (is_null_sid(&extra->pgid_sid)) {
392 /* we couldn't find the user sid, bail out */
393 DEBUG(3, ("Invalid group SID\n"));
394 TALLOC_FREE(usrtok);
395 return NT_STATUS_UNSUCCESSFUL;
396 }
397 sid_copy(&usrtok->sids[1], &extra->pgid_sid);
398 } else {
399 sid_copy(&usrtok->sids[1], info3->base.domain_sid);
400 sid_append_rid(&usrtok->sids[1],
401 info3->base.primary_gid);
402 }
403
404 /* Now the SIDs we got from authentication. These are the ones from
405 * the info3 struct or from the pdb_enum_group_memberships, depending
406 * on who authenticated the user.
407 * Note that we start the for loop at "1" here, we already added the
408 * first group sid as primary above. */
409
410 for (i = 0; i < info3->base.groups.count; i++) {
411 struct dom_sid tmp_sid;
412
413 sid_copy(&tmp_sid, info3->base.domain_sid);
414 sid_append_rid(&tmp_sid, info3->base.groups.rids[i].rid);
415
416 status = add_sid_to_array_unique(usrtok, &tmp_sid,
417 &usrtok->sids,
418 &usrtok->num_sids);
419 if (!NT_STATUS_IS_OK(status)) {
420 DEBUG(3, ("Failed to add SID to nt token\n"));
421 TALLOC_FREE(usrtok);
422 return status;
423 }
424 }
425
426 /* now also add extra sids if they are not the special user/group
427 * sids */
428 for (i = 0; i < info3->sidcount; i++) {
429 status = add_sid_to_array_unique(usrtok,
430 info3->sids[i].sid,
431 &usrtok->sids,
432 &usrtok->num_sids);
433 if (!NT_STATUS_IS_OK(status)) {
434 DEBUG(3, ("Failed to add SID to nt token\n"));
435 TALLOC_FREE(usrtok);
436 return status;
437 }
438 }
439
440 status = finalize_local_nt_token(usrtok, is_guest);
441 if (!NT_STATUS_IS_OK(status)) {
442 DEBUG(3, ("Failed to finalize nt token\n"));
443 TALLOC_FREE(usrtok);
444 return status;
445 }
446
447 *ntok = usrtok;
448 return NT_STATUS_OK;
449 }
450
451 /*******************************************************************
452 Create a NT token for the user, expanding local aliases
453 *******************************************************************/
454
455 struct security_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
456 const struct dom_sid *user_sid,
457 bool is_guest,
458 int num_groupsids,
459 const struct dom_sid *groupsids)
460 {
461 struct security_token *result = NULL;
462 int i;
463 NTSTATUS status;
464
465 DEBUG(10, ("Create local NT token for %s\n",
466 sid_string_dbg(user_sid)));
467
468 if (!(result = TALLOC_ZERO_P(mem_ctx, struct security_token))) {
469 DEBUG(0, ("talloc failed\n"));
470 return NULL;
471 }
472
473 /* Add the user and primary group sid */
474
475 status = add_sid_to_array(result, user_sid,
476 &result->sids, &result->num_sids);
477 if (!NT_STATUS_IS_OK(status)) {
478 TALLOC_FREE(result);
479 return NULL;
480 }
481
482 /* For guest, num_groupsids may be zero. */
483 if (num_groupsids) {
484 status = add_sid_to_array(result, &groupsids[0],
485 &result->sids,
486 &result->num_sids);
487 if (!NT_STATUS_IS_OK(status)) {
488 TALLOC_FREE(result);
489 return NULL;
490 }
491 }
492
493 /* Now the SIDs we got from authentication. These are the ones from
494 * the info3 struct or from the pdb_enum_group_memberships, depending
495 * on who authenticated the user.
496 * Note that we start the for loop at "1" here, we already added the
497 * first group sid as primary above. */
498
499 for (i=1; i<num_groupsids; i++) {
500 status = add_sid_to_array_unique(result, &groupsids[i],
501 &result->sids,
502 &result->num_sids);
503 if (!NT_STATUS_IS_OK(status)) {
504 TALLOC_FREE(result);
505 return NULL;
506 }
507 }
508
509 status = finalize_local_nt_token(result, is_guest);
510 if (!NT_STATUS_IS_OK(status)) {
511 TALLOC_FREE(result);
512 return NULL;
513 }
514
515 return result;
516 }
517
518 static NTSTATUS finalize_local_nt_token(struct security_token *result,
519 bool is_guest)
520 {
521 struct dom_sid dom_sid;
522 gid_t gid;
523 NTSTATUS status;
524
525 /* Add in BUILTIN sids */
526
527 status = add_sid_to_array(result, &global_sid_World,
528 &result->sids, &result->num_sids);
529 if (!NT_STATUS_IS_OK(status)) {
530 return status;
531 }
532 status = add_sid_to_array(result, &global_sid_Network,
533 &result->sids, &result->num_sids);
534 if (!NT_STATUS_IS_OK(status)) {
535 return status;
536 }
537
538 if (is_guest) {
539 status = add_sid_to_array(result, &global_sid_Builtin_Guests,
540 &result->sids,
541 &result->num_sids);
542 if (!NT_STATUS_IS_OK(status)) {
543 return status;
544 }
545 } else {
546 status = add_sid_to_array(result,
547 &global_sid_Authenticated_Users,
548 &result->sids,
549 &result->num_sids);
550 if (!NT_STATUS_IS_OK(status)) {
551 return status;
552 }
553 }
554
555 /* Deal with the BUILTIN\Administrators group. If the SID can
556 be resolved then assume that the add_aliasmem( S-1-5-32 )
557 handled it. */
558
559 if (!sid_to_gid(&global_sid_Builtin_Administrators, &gid)) {
560
561 become_root();
562 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
563 status = NT_STATUS_OK;
564 DEBUG(3, ("Failed to fetch domain sid for %s\n",
565 lp_workgroup()));
566 } else {
567 status = create_builtin_administrators(&dom_sid);
568 }
569 unbecome_root();
570
571 if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) {
572 /* Add BUILTIN\Administrators directly to token. */
573 status = add_builtin_administrators(result, &dom_sid);
574 if ( !NT_STATUS_IS_OK(status) ) {
575 DEBUG(3, ("Failed to check for local "
576 "Administrators membership (%s)\n",
577 nt_errstr(status)));
578 }
579 } else if (!NT_STATUS_IS_OK(status)) {
580 DEBUG(2, ("WARNING: Failed to create "
581 "BUILTIN\\Administrators group! Can "
582 "Winbind allocate gids?\n"));
583 }
584 }
585
586 /* Deal with the BUILTIN\Users group. If the SID can
587 be resolved then assume that the add_aliasmem( S-1-5-32 )
588 handled it. */
589
590 if (!sid_to_gid(&global_sid_Builtin_Users, &gid)) {
591
592 become_root();
593 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
594 status = NT_STATUS_OK;
595 DEBUG(3, ("Failed to fetch domain sid for %s\n",
596 lp_workgroup()));
597 } else {
598 status = create_builtin_users(&dom_sid);
599 }
600 unbecome_root();
601
602 if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) &&
603 !NT_STATUS_IS_OK(status))
604 {
605 DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! "
606 "Can Winbind allocate gids?\n"));
607 }
608 }
609
610 /* Deal with local groups */
611
612 if (lp_winbind_nested_groups()) {
613
614 become_root();
615
616 /* Now add the aliases. First the one from our local SAM */
617
618 status = add_aliases(get_global_sam_sid(), result);
619
620 if (!NT_STATUS_IS_OK(status)) {
621 unbecome_root();
622 return status;
623 }
624
625 /* Finally the builtin ones */
626
627 status = add_aliases(&global_sid_Builtin, result);
628
629 if (!NT_STATUS_IS_OK(status)) {
630 unbecome_root();
631 return status;
632 }
633
634 unbecome_root();
635 }
636
637 /* Add privileges based on current user sids */
638
639 get_privileges_for_sids(&result->privilege_mask, result->sids,
640 result->num_sids);
641
642 return NT_STATUS_OK;
643 }
644
645 /****************************************************************************
646 prints a UNIX 'token' to debug output.
647 ****************************************************************************/
648
649 void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
650 int n_groups, gid_t *groups)
651 {
652 int i;
653 DEBUGC(dbg_class, dbg_lev,
654 ("UNIX token of user %ld\n", (long int)uid));
655
656 DEBUGADDC(dbg_class, dbg_lev,
657 ("Primary group is %ld and contains %i supplementary "
658 "groups\n", (long int)gid, n_groups));
659 for (i = 0; i < n_groups; i++)
660 DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
661 (long int)groups[i]));
662 }
663
664 /*
665 * Create an artificial NT token given just a username. (Initially intended
666 * for force user)
667 *
668 * We go through lookup_name() to avoid problems we had with 'winbind use
669 * default domain'.
670 *
671 * We have 3 cases:
672 *
673 * unmapped unix users: Go directly to nss to find the user's group.
674 *
675 * A passdb user: The list of groups is provided by pdb_enum_group_memberships.
676 *
677 * If the user is provided by winbind, the primary gid is set to "domain
678 * users" of the user's domain. For an explanation why this is necessary, see
679 * the thread starting at
680 * http://lists.samba.org/archive/samba-technical/2006-January/044803.html.
681 */
682
683 NTSTATUS create_token_from_username(TALLOC_CTX *mem_ctx, const char *username,
684 bool is_guest,
685 uid_t *uid, gid_t *gid,
686 char **found_username,
687 struct security_token **token)
688 {
689 NTSTATUS result = NT_STATUS_NO_SUCH_USER;
690 TALLOC_CTX *tmp_ctx = talloc_stackframe();
691 struct dom_sid user_sid;
692 enum lsa_SidType type;
693 gid_t *gids;
694 struct dom_sid *group_sids;
695 struct dom_sid unix_group_sid;
696 uint32_t num_group_sids;
697 uint32_t num_gids;
698 uint32_t i;
699
700 if (!lookup_name_smbconf(tmp_ctx, username, LOOKUP_NAME_ALL,
701 NULL, NULL, &user_sid, &type)) {
702 DEBUG(1, ("lookup_name_smbconf for %s failed\n", username));
703 goto done;
704 }
705
706 if (type != SID_NAME_USER) {
707 DEBUG(1, ("%s is a %s, not a user\n", username,
708 sid_type_lookup(type)));
709 goto done;
710 }
711
712 if (sid_check_is_in_our_domain(&user_sid)) {
713 bool ret;
714 uint32_t pdb_num_group_sids;
715 /* This is a passdb user, so ask passdb */
716
717 struct samu *sam_acct = NULL;
718
719 if ( !(sam_acct = samu_new( tmp_ctx )) ) {
720 result = NT_STATUS_NO_MEMORY;
721 goto done;
722 }
723
724 become_root();
725 ret = pdb_getsampwsid(sam_acct, &user_sid);
726 unbecome_root();
727
728 if (!ret) {
729 DEBUG(1, ("pdb_getsampwsid(%s) for user %s failed\n",
730 sid_string_dbg(&user_sid), username));
731 DEBUGADD(1, ("Fall back to unix user %s\n", username));
732 goto unix_user;
733 }
734
735 result = pdb_enum_group_memberships(tmp_ctx, sam_acct,
736 &group_sids, &gids,
737 &pdb_num_group_sids);
738 if (!NT_STATUS_IS_OK(result)) {
739 DEBUG(1, ("enum_group_memberships failed for %s (%s): "
740 "%s\n", username, sid_string_dbg(&user_sid),
741 nt_errstr(result)));
742 DEBUGADD(1, ("Fall back to unix user %s\n", username));
743 goto unix_user;
744 }
745 num_group_sids = pdb_num_group_sids;
746
747 /* see the smb_panic() in pdb_default_enum_group_memberships */
748 SMB_ASSERT(num_group_sids > 0);
749
750 *gid = gids[0];
751
752 /* Ensure we're returning the found_username on the right context. */
753 *found_username = talloc_strdup(mem_ctx,
754 pdb_get_username(sam_acct));
755
756 /*
757 * If the SID from lookup_name() was the guest sid, passdb knows
758 * about the mapping of guest sid to lp_guestaccount()
759 * username and will return the unix_pw info for a guest
760 * user. Use it if it's there, else lookup the *uid details
761 * using Get_Pwnam_alloc(). See bug #6291 for details. JRA.
762 */
763
764 /* We must always assign the *uid. */
765 if (sam_acct->unix_pw == NULL) {
766 struct passwd *pwd = Get_Pwnam_alloc(sam_acct, *found_username );
767 if (!pwd) {
768 DEBUG(10, ("Get_Pwnam_alloc failed for %s\n",
769 *found_username));
770 result = NT_STATUS_NO_SUCH_USER;
771 goto done;
772 }
773 result = samu_set_unix(sam_acct, pwd );
774 if (!NT_STATUS_IS_OK(result)) {
775 DEBUG(10, ("samu_set_unix failed for %s\n",
776 *found_username));
777 result = NT_STATUS_NO_SUCH_USER;
778 goto done;
779 }
780 }
781 *uid = sam_acct->unix_pw->pw_uid;
782
783 } else if (sid_check_is_in_unix_users(&user_sid)) {
784 uint32_t getgroups_num_group_sids;
785 /* This is a unix user not in passdb. We need to ask nss
786 * directly, without consulting passdb */
787
788 struct passwd *pass;
789
790 /*
791 * This goto target is used as a fallback for the passdb
792 * case. The concrete bug report is when passdb gave us an
793 * unmapped gid.
794 */
795
796 unix_user:
797
798 if (!sid_to_uid(&user_sid, uid)) {
799 DEBUG(1, ("unix_user case, sid_to_uid for %s (%s) failed\n",
800 username, sid_string_dbg(&user_sid)));
801 result = NT_STATUS_NO_SUCH_USER;
802 goto done;
803 }
804
805 uid_to_unix_users_sid(*uid, &user_sid);
806
807 pass = getpwuid_alloc(tmp_ctx, *uid);
808 if (pass == NULL) {
809 DEBUG(1, ("getpwuid(%u) for user %s failed\n",
810 (unsigned int)*uid, username));
811 goto done;
812 }
813
814 if (!getgroups_unix_user(tmp_ctx, username, pass->pw_gid,
815 &gids, &getgroups_num_group_sids)) {
816 DEBUG(1, ("getgroups_unix_user for user %s failed\n",
817 username));
818 goto done;
819 }
820 num_group_sids = getgroups_num_group_sids;
821
822 if (num_group_sids) {
823 group_sids = TALLOC_ARRAY(tmp_ctx, struct dom_sid, num_group_sids);
824 if (group_sids == NULL) {
825 DEBUG(1, ("TALLOC_ARRAY failed\n"));
826 result = NT_STATUS_NO_MEMORY;
827 goto done;
828 }
829 } else {
830 group_sids = NULL;
831 }
832
833 for (i=0; i<num_group_sids; i++) {
834 gid_to_sid(&group_sids[i], gids[i]);
835 }
836
837 /* In getgroups_unix_user we always set the primary gid */
838 SMB_ASSERT(num_group_sids > 0);
839
840 *gid = gids[0];
841
842 /* Ensure we're returning the found_username on the right context. */
843 *found_username = talloc_strdup(mem_ctx, pass->pw_name);
844 } else {
845
846 /* This user is from winbind, force the primary gid to the
847 * user's "domain users" group. Under certain circumstances
848 * (user comes from NT4), this might be a loss of
849 * information. But we can not rely on winbind getting the
850 * correct info. AD might prohibit winbind looking up that
851 * information. */
852
853 /* We must always assign the *uid. */
854 if (!sid_to_uid(&user_sid, uid)) {
855 DEBUG(1, ("winbindd case, sid_to_uid for %s (%s) failed\n",
856 username, sid_string_dbg(&user_sid)));
857 result = NT_STATUS_NO_SUCH_USER;
858 goto done;
859 }
860
861 num_group_sids = 1;
862 group_sids = TALLOC_ARRAY(tmp_ctx, struct dom_sid, num_group_sids);
863 if (group_sids == NULL) {
864 DEBUG(1, ("TALLOC_ARRAY failed\n"));
865 result = NT_STATUS_NO_MEMORY;
866 goto done;
867 }
868
869 sid_copy(&group_sids[0], &user_sid);
870 sid_split_rid(&group_sids[0], NULL);
871 sid_append_rid(&group_sids[0], DOMAIN_RID_USERS);
872
873 if (!sid_to_gid(&group_sids[0], gid)) {
874 DEBUG(1, ("sid_to_gid(%s) failed\n",
875 sid_string_dbg(&group_sids[0])));
876 goto done;
877 }
878
879 gids = gid;
880
881 /* Ensure we're returning the found_username on the right context. */
882 *found_username = talloc_strdup(mem_ctx, username);
883 }
884
885 /* Add the "Unix Group" SID for each gid to catch mapped groups
886 and their Unix equivalent. This is to solve the backwards
887 compatibility problem of 'valid users = +ntadmin' where
888 ntadmin has been paired with "Domain Admins" in the group
889 mapping table. Otherwise smb.conf would need to be changed
890 to 'valid user = "Domain Admins"'. --jerry */
891
892 num_gids = num_group_sids;
893 for ( i=0; i<num_gids; i++ ) {
894 gid_t high, low;
895
896 /* don't pickup anything managed by Winbind */
897
898 if ( lp_idmap_gid(&low, &high) && (gids[i] >= low) && (gids[i] <= high) )
899 continue;
900
901 gid_to_unix_groups_sid(gids[i], &unix_group_sid);
902
903 result = add_sid_to_array_unique(tmp_ctx, &unix_group_sid,
904 &group_sids, &num_group_sids);
905 if (!NT_STATUS_IS_OK(result)) {
906 goto done;
907 }
908 }
909
910 /* Ensure we're creating the nt_token on the right context. */
911 *token = create_local_nt_token(mem_ctx, &user_sid,
912 is_guest, num_group_sids, group_sids);
913
914 if ((*token == NULL) || (*found_username == NULL)) {
915 result = NT_STATUS_NO_MEMORY;
916 goto done;
917 }
918
919 result = NT_STATUS_OK;
920 done:
921 TALLOC_FREE(tmp_ctx);
922 return result;
923 }
924
925 /***************************************************************************
926 Build upon create_token_from_username:
927
928 Expensive helper function to figure out whether a user given its name is
929 member of a particular group.
930 ***************************************************************************/
931
932 bool user_in_group_sid(const char *username, const struct dom_sid *group_sid)
933 {
934 NTSTATUS status;
935 uid_t uid;
936 gid_t gid;
937 char *found_username;
938 struct security_token *token;
939 bool result;
940 TALLOC_CTX *mem_ctx = talloc_stackframe();
941
942 status = create_token_from_username(mem_ctx, username, False,
943 &uid, &gid, &found_username,
944 &token);
945
946 if (!NT_STATUS_IS_OK(status)) {
947 DEBUG(10, ("could not create token for %s\n", username));
948 TALLOC_FREE(mem_ctx);
949 return False;
950 }
951
952 result = security_token_has_sid(token, group_sid);
953
954 TALLOC_FREE(mem_ctx);
955 return result;
956 }
957
958 bool user_in_group(const char *username, const char *groupname)
959 {
960 TALLOC_CTX *mem_ctx = talloc_stackframe();
961 struct dom_sid group_sid;
962 bool ret;
963
964 ret = lookup_name(mem_ctx, groupname, LOOKUP_NAME_ALL,
965 NULL, NULL, &group_sid, NULL);
966 TALLOC_FREE(mem_ctx);
967
968 if (!ret) {
969 DEBUG(10, ("lookup_name for (%s) failed.\n", groupname));
970 return False;
971 }
972
973 return user_in_group_sid(username, &group_sid);
974 }
975
976 /* END */
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