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s3: VFS: Protect errno if sys_getwd() fails across free() call.
[Samba.git] / source3 / auth / token_util.c
blob77b63e4ba63893541bf0d12b14a1bd7a73416f00
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 "lib/util_unixsids.h"
29 #include "system/passwd.h"
30 #include "auth.h"
31 #include "secrets.h"
32 #include "../lib/util/memcache.h"
33 #include "../librpc/gen_ndr/netlogon.h"
34 #include "../libcli/security/security.h"
35 #include "../lib/util/util_pw.h"
36 #include "passdb.h"
37 #include "lib/privileges.h"
38
39 /****************************************************************************
40 Check for a SID in an struct security_token
41 ****************************************************************************/
42
43 bool nt_token_check_sid ( const struct dom_sid *sid, const struct security_token *token )
44 {
45 if ( !sid || !token )
46 return False;
47
48 return security_token_has_sid(token, sid);
49 }
50
51 bool nt_token_check_domain_rid( struct security_token *token, uint32_t rid )
52 {
53 struct dom_sid domain_sid;
54
55 /* if we are a domain member, the get the domain SID, else for
56 a DC or standalone server, use our own SID */
57
58 if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
59 if ( !secrets_fetch_domain_sid( lp_workgroup(),
60 &domain_sid ) ) {
61 DEBUG(1,("nt_token_check_domain_rid: Cannot lookup "
62 "SID for domain [%s]\n", lp_workgroup()));
63 return False;
64 }
65 }
66 else
67 sid_copy( &domain_sid, get_global_sam_sid() );
68
69 sid_append_rid( &domain_sid, rid );
70
71 return nt_token_check_sid( &domain_sid, token );\
72 }
73
74 /******************************************************************************
75 Create a token for the root user to be used internally by smbd.
76 This is similar to running under the context of the LOCAL_SYSTEM account
77 in Windows. This is a read-only token. Do not modify it or free() it.
78 Create a copy if you need to change it.
79 ******************************************************************************/
80
81 struct security_token *get_root_nt_token( void )
82 {
83 struct security_token *token, *for_cache;
84 struct dom_sid u_sid, g_sid;
85 struct passwd *pw;
86 void *cache_data;
87
88 cache_data = memcache_lookup_talloc(
89 NULL, SINGLETON_CACHE_TALLOC,
90 data_blob_string_const_null("root_nt_token"));
91
92 if (cache_data != NULL) {
93 return talloc_get_type_abort(
94 cache_data, struct security_token);
95 }
96
97 if ( !(pw = getpwuid(0)) ) {
98 if ( !(pw = getpwnam("root")) ) {
99 DEBUG(0,("get_root_nt_token: both getpwuid(0) "
100 "and getpwnam(\"root\") failed!\n"));
101 return NULL;
102 }
103 }
104
105 /* get the user and primary group SIDs; although the
106 BUILTIN\Administrators SId is really the one that matters here */
107
108 uid_to_sid(&u_sid, pw->pw_uid);
109 gid_to_sid(&g_sid, pw->pw_gid);
110
111 token = create_local_nt_token(talloc_tos(), &u_sid, False,
112 1, &global_sid_Builtin_Administrators);
113
114 security_token_set_privilege(token, SEC_PRIV_DISK_OPERATOR);
115
116 for_cache = token;
117
118 memcache_add_talloc(
119 NULL, SINGLETON_CACHE_TALLOC,
120 data_blob_string_const_null("root_nt_token"), &for_cache);
121
122 return token;
123 }
124
125
126 /*
127 * Add alias SIDs from memberships within the partially created token SID list
128 */
129
130 NTSTATUS add_aliases(const struct dom_sid *domain_sid,
131 struct security_token *token)
132 {
133 uint32_t *aliases;
134 size_t i, num_aliases;
135 NTSTATUS status;
136 TALLOC_CTX *tmp_ctx;
137
138 if (!(tmp_ctx = talloc_init("add_aliases"))) {
139 return NT_STATUS_NO_MEMORY;
140 }
141
142 aliases = NULL;
143 num_aliases = 0;
144
145 status = pdb_enum_alias_memberships(tmp_ctx, domain_sid,
146 token->sids,
147 token->num_sids,
148 &aliases, &num_aliases);
149
150 if (!NT_STATUS_IS_OK(status)) {
151 DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n",
152 nt_errstr(status)));
153 goto done;
154 }
155
156 for (i=0; i<num_aliases; i++) {
157 struct dom_sid alias_sid;
158 sid_compose(&alias_sid, domain_sid, aliases[i]);
159 status = add_sid_to_array_unique(token, &alias_sid,
160 &token->sids,
161 &token->num_sids);
162 if (!NT_STATUS_IS_OK(status)) {
163 DEBUG(0, ("add_sid_to_array failed\n"));
164 goto done;
165 }
166 }
167
168 done:
169 TALLOC_FREE(tmp_ctx);
170 return NT_STATUS_OK;
171 }
172
173 /*******************************************************************
174 *******************************************************************/
175
176 static NTSTATUS add_builtin_administrators(struct security_token *token,
177 const struct dom_sid *dom_sid)
178 {
179 struct dom_sid domadm;
180 NTSTATUS status;
181
182 /* nothing to do if we aren't in a domain */
183
184 if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) {
185 return NT_STATUS_OK;
186 }
187
188 /* Find the Domain Admins SID */
189
190 if ( IS_DC ) {
191 sid_copy( &domadm, get_global_sam_sid() );
192 } else {
193 sid_copy(&domadm, dom_sid);
194 }
195 sid_append_rid( &domadm, DOMAIN_RID_ADMINS );
196
197 /* Add Administrators if the user beloongs to Domain Admins */
198
199 if ( nt_token_check_sid( &domadm, token ) ) {
200 status = add_sid_to_array(token,
201 &global_sid_Builtin_Administrators,
202 &token->sids, &token->num_sids);
203 if (!NT_STATUS_IS_OK(status)) {
204 return status;
205 }
206 }
207
208 return NT_STATUS_OK;
209 }
210
211 static NTSTATUS finalize_local_nt_token(struct security_token *result,
212 bool is_guest);
213
214 NTSTATUS create_local_nt_token_from_info3(TALLOC_CTX *mem_ctx,
215 bool is_guest,
216 const struct netr_SamInfo3 *info3,
217 const struct extra_auth_info *extra,
218 struct security_token **ntok)
219 {
220 struct security_token *usrtok = NULL;
221 NTSTATUS status;
222 int i;
223
224 DEBUG(10, ("Create local NT token for %s\n",
225 info3->base.account_name.string));
226
227 usrtok = talloc_zero(mem_ctx, struct security_token);
228 if (!usrtok) {
229 DEBUG(0, ("talloc failed\n"));
230 return NT_STATUS_NO_MEMORY;
231 }
232
233 /* Add the user and primary group sid FIRST */
234 /* check if the user rid is the special "Domain Guests" rid.
235 * If so pick the first sid for the extra sids instead as it
236 * is a local fake account */
237 usrtok->sids = talloc_array(usrtok, struct dom_sid, 2);
238 if (!usrtok->sids) {
239 TALLOC_FREE(usrtok);
240 return NT_STATUS_NO_MEMORY;
241 }
242 usrtok->num_sids = 2;
243
244 /* USER SID */
245 if (info3->base.rid == (uint32_t)(-1)) {
246 /* this is a signal the user was fake and generated,
247 * the actual SID we want to use is stored in the extra
248 * sids */
249 if (is_null_sid(&extra->user_sid)) {
250 /* we couldn't find the user sid, bail out */
251 DEBUG(3, ("Invalid user SID\n"));
252 TALLOC_FREE(usrtok);
253 return NT_STATUS_UNSUCCESSFUL;
254 }
255 sid_copy(&usrtok->sids[0], &extra->user_sid);
256 } else {
257 sid_copy(&usrtok->sids[0], info3->base.domain_sid);
258 sid_append_rid(&usrtok->sids[0], info3->base.rid);
259 }
260
261 /* GROUP SID */
262 if (info3->base.primary_gid == (uint32_t)(-1)) {
263 /* this is a signal the user was fake and generated,
264 * the actual SID we want to use is stored in the extra
265 * sids */
266 if (is_null_sid(&extra->pgid_sid)) {
267 /* we couldn't find the user sid, bail out */
268 DEBUG(3, ("Invalid group SID\n"));
269 TALLOC_FREE(usrtok);
270 return NT_STATUS_UNSUCCESSFUL;
271 }
272 sid_copy(&usrtok->sids[1], &extra->pgid_sid);
273 } else {
274 sid_copy(&usrtok->sids[1], info3->base.domain_sid);
275 sid_append_rid(&usrtok->sids[1],
276 info3->base.primary_gid);
277 }
278
279 /* Now the SIDs we got from authentication. These are the ones from
280 * the info3 struct or from the pdb_enum_group_memberships, depending
281 * on who authenticated the user.
282 * Note that we start the for loop at "1" here, we already added the
283 * first group sid as primary above. */
284
285 for (i = 0; i < info3->base.groups.count; i++) {
286 struct dom_sid tmp_sid;
287
288 sid_copy(&tmp_sid, info3->base.domain_sid);
289 sid_append_rid(&tmp_sid, info3->base.groups.rids[i].rid);
290
291 status = add_sid_to_array_unique(usrtok, &tmp_sid,
292 &usrtok->sids,
293 &usrtok->num_sids);
294 if (!NT_STATUS_IS_OK(status)) {
295 DEBUG(3, ("Failed to add SID to nt token\n"));
296 TALLOC_FREE(usrtok);
297 return status;
298 }
299 }
300
301 /* now also add extra sids if they are not the special user/group
302 * sids */
303 for (i = 0; i < info3->sidcount; i++) {
304 status = add_sid_to_array_unique(usrtok,
305 info3->sids[i].sid,
306 &usrtok->sids,
307 &usrtok->num_sids);
308 if (!NT_STATUS_IS_OK(status)) {
309 DEBUG(3, ("Failed to add SID to nt token\n"));
310 TALLOC_FREE(usrtok);
311 return status;
312 }
313 }
314
315 status = finalize_local_nt_token(usrtok, is_guest);
316 if (!NT_STATUS_IS_OK(status)) {
317 DEBUG(3, ("Failed to finalize nt token\n"));
318 TALLOC_FREE(usrtok);
319 return status;
320 }
321
322 *ntok = usrtok;
323 return NT_STATUS_OK;
324 }
325
326 /*******************************************************************
327 Create a NT token for the user, expanding local aliases
328 *******************************************************************/
329
330 struct security_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
331 const struct dom_sid *user_sid,
332 bool is_guest,
333 int num_groupsids,
334 const struct dom_sid *groupsids)
335 {
336 struct security_token *result = NULL;
337 int i;
338 NTSTATUS status;
339
340 DEBUG(10, ("Create local NT token for %s\n",
341 sid_string_dbg(user_sid)));
342
343 if (!(result = talloc_zero(mem_ctx, struct security_token))) {
344 DEBUG(0, ("talloc failed\n"));
345 return NULL;
346 }
347
348 /* Add the user and primary group sid */
349
350 status = add_sid_to_array(result, user_sid,
351 &result->sids, &result->num_sids);
352 if (!NT_STATUS_IS_OK(status)) {
353 TALLOC_FREE(result);
354 return NULL;
355 }
356
357 /* For guest, num_groupsids may be zero. */
358 if (num_groupsids) {
359 status = add_sid_to_array(result, &groupsids[0],
360 &result->sids,
361 &result->num_sids);
362 if (!NT_STATUS_IS_OK(status)) {
363 TALLOC_FREE(result);
364 return NULL;
365 }
366 }
367
368 /* Now the SIDs we got from authentication. These are the ones from
369 * the info3 struct or from the pdb_enum_group_memberships, depending
370 * on who authenticated the user.
371 * Note that we start the for loop at "1" here, we already added the
372 * first group sid as primary above. */
373
374 for (i=1; i<num_groupsids; i++) {
375 status = add_sid_to_array_unique(result, &groupsids[i],
376 &result->sids,
377 &result->num_sids);
378 if (!NT_STATUS_IS_OK(status)) {
379 TALLOC_FREE(result);
380 return NULL;
381 }
382 }
383
384 status = finalize_local_nt_token(result, is_guest);
385 if (!NT_STATUS_IS_OK(status)) {
386 TALLOC_FREE(result);
387 return NULL;
388 }
389
390 return result;
391 }
392
393 /***************************************************
394 Merge in any groups from /etc/group.
395 ***************************************************/
396
397 static NTSTATUS add_local_groups(struct security_token *result,
398 bool is_guest)
399 {
400 gid_t *gids = NULL;
401 uint32_t getgroups_num_group_sids = 0;
402 struct passwd *pass = NULL;
403 TALLOC_CTX *tmp_ctx = talloc_stackframe();
404 int i;
405
406 if (is_guest) {
407 /*
408 * Guest is a special case. It's always
409 * a user that can be looked up, but
410 * result->sids[0] is set to DOMAIN\Guest.
411 * Lookup by account name instead.
412 */
413 pass = Get_Pwnam_alloc(tmp_ctx, lp_guest_account());
414 } else {
415 uid_t uid;
416
417 /* For non-guest result->sids[0] is always the user sid. */
418 if (!sid_to_uid(&result->sids[0], &uid)) {
419 /*
420 * Non-mappable SID like SYSTEM.
421 * Can't be in any /etc/group groups.
422 */
423 TALLOC_FREE(tmp_ctx);
424 return NT_STATUS_OK;
425 }
426
427 pass = getpwuid_alloc(tmp_ctx, uid);
428 if (pass == NULL) {
429 DEBUG(1, ("SID %s -> getpwuid(%u) failed\n",
430 sid_string_dbg(&result->sids[0]),
431 (unsigned int)uid));
432 }
433 }
434
435 if (!pass) {
436 TALLOC_FREE(tmp_ctx);
437 return NT_STATUS_UNSUCCESSFUL;
438 }
439
440 /*
441 * Now we must get any groups this user has been
442 * added to in /etc/group and merge them in.
443 * This has to be done in every code path
444 * that creates an NT token, as remote users
445 * may have been added to the local /etc/group
446 * database. Tokens created merely from the
447 * info3 structs (via the DC or via the krb5 PAC)
448 * won't have these local groups. Note the
449 * groups added here will only be UNIX groups
450 * (S-1-22-2-XXXX groups) as getgroups_unix_user()
451 * turns off winbindd before calling getgroups().
452 *
453 * NB. This is duplicating work already
454 * done in the 'unix_user:' case of
455 * create_token_from_sid() but won't
456 * do anything other than be inefficient
457 * in that case.
458 */
459
460 if (!getgroups_unix_user(tmp_ctx, pass->pw_name, pass->pw_gid,
461 &gids, &getgroups_num_group_sids)) {
462 DEBUG(1, ("getgroups_unix_user for user %s failed\n",
463 pass->pw_name));
464 TALLOC_FREE(tmp_ctx);
465 return NT_STATUS_UNSUCCESSFUL;
466 }
467
468 for (i=0; i<getgroups_num_group_sids; i++) {
469 NTSTATUS status;
470 struct dom_sid grp_sid;
471 gid_to_sid(&grp_sid, gids[i]);
472
473 status = add_sid_to_array_unique(result,
474 &grp_sid,
475 &result->sids,
476 &result->num_sids);
477 if (!NT_STATUS_IS_OK(status)) {
478 DEBUG(3, ("Failed to add UNIX SID to nt token\n"));
479 TALLOC_FREE(tmp_ctx);
480 return status;
481 }
482 }
483 TALLOC_FREE(tmp_ctx);
484 return NT_STATUS_OK;
485 }
486
487 static NTSTATUS finalize_local_nt_token(struct security_token *result,
488 bool is_guest)
489 {
490 struct dom_sid dom_sid;
491 NTSTATUS status;
492 struct acct_info *info;
493
494 /* Add any local groups. */
495
496 status = add_local_groups(result, is_guest);
497 if (!NT_STATUS_IS_OK(status)) {
498 return status;
499 }
500
501 /* Add in BUILTIN sids */
502
503 status = add_sid_to_array(result, &global_sid_World,
504 &result->sids, &result->num_sids);
505 if (!NT_STATUS_IS_OK(status)) {
506 return status;
507 }
508 status = add_sid_to_array(result, &global_sid_Network,
509 &result->sids, &result->num_sids);
510 if (!NT_STATUS_IS_OK(status)) {
511 return status;
512 }
513
514 if (is_guest) {
515 status = add_sid_to_array(result, &global_sid_Builtin_Guests,
516 &result->sids,
517 &result->num_sids);
518 if (!NT_STATUS_IS_OK(status)) {
519 return status;
520 }
521 } else {
522 status = add_sid_to_array(result,
523 &global_sid_Authenticated_Users,
524 &result->sids,
525 &result->num_sids);
526 if (!NT_STATUS_IS_OK(status)) {
527 return status;
528 }
529 }
530
531 info = talloc_zero(talloc_tos(), struct acct_info);
532 if (info == NULL) {
533 DEBUG(0, ("talloc failed!\n"));
534 return NT_STATUS_NO_MEMORY;
535 }
536
537 /* Deal with the BUILTIN\Administrators group. If the SID can
538 be resolved then assume that the add_aliasmem( S-1-5-32 )
539 handled it. */
540
541 status = pdb_get_aliasinfo(&global_sid_Builtin_Administrators, info);
542 if (!NT_STATUS_IS_OK(status)) {
543
544 become_root();
545 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
546 status = NT_STATUS_OK;
547 DEBUG(3, ("Failed to fetch domain sid for %s\n",
548 lp_workgroup()));
549 } else {
550 status = create_builtin_administrators(&dom_sid);
551 }
552 unbecome_root();
553
554 if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) {
555 /* Add BUILTIN\Administrators directly to token. */
556 status = add_builtin_administrators(result, &dom_sid);
557 if ( !NT_STATUS_IS_OK(status) ) {
558 DEBUG(3, ("Failed to check for local "
559 "Administrators membership (%s)\n",
560 nt_errstr(status)));
561 }
562 } else if (!NT_STATUS_IS_OK(status)) {
563 DEBUG(2, ("WARNING: Failed to create "
564 "BUILTIN\\Administrators group! Can "
565 "Winbind allocate gids?\n"));
566 }
567 }
568
569 /* Deal with the BUILTIN\Users group. If the SID can
570 be resolved then assume that the add_aliasmem( S-1-5-32 )
571 handled it. */
572
573 status = pdb_get_aliasinfo(&global_sid_Builtin_Users, info);
574 if (!NT_STATUS_IS_OK(status)) {
575
576 become_root();
577 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
578 status = NT_STATUS_OK;
579 DEBUG(3, ("Failed to fetch domain sid for %s\n",
580 lp_workgroup()));
581 } else {
582 status = create_builtin_users(&dom_sid);
583 }
584 unbecome_root();
585
586 if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) &&
587 !NT_STATUS_IS_OK(status))
588 {
589 DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! "
590 "Can Winbind allocate gids?\n"));
591 }
592 }
593
594 TALLOC_FREE(info);
595
596 /* Deal with local groups */
597
598 if (lp_winbind_nested_groups()) {
599
600 become_root();
601
602 /* Now add the aliases. First the one from our local SAM */
603
604 status = add_aliases(get_global_sam_sid(), result);
605
606 if (!NT_STATUS_IS_OK(status)) {
607 unbecome_root();
608 return status;
609 }
610
611 /* Finally the builtin ones */
612
613 status = add_aliases(&global_sid_Builtin, result);
614
615 if (!NT_STATUS_IS_OK(status)) {
616 unbecome_root();
617 return status;
618 }
619
620 unbecome_root();
621 }
622
623 /* Add privileges based on current user sids */
624
625 get_privileges_for_sids(&result->privilege_mask, result->sids,
626 result->num_sids);
627
628 return NT_STATUS_OK;
629 }
630
631 /****************************************************************************
632 prints a UNIX 'token' to debug output.
633 ****************************************************************************/
634
635 void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
636 int n_groups, gid_t *groups)
637 {
638 int i;
639 DEBUGC(dbg_class, dbg_lev,
640 ("UNIX token of user %ld\n", (long int)uid));
641
642 DEBUGADDC(dbg_class, dbg_lev,
643 ("Primary group is %ld and contains %i supplementary "
644 "groups\n", (long int)gid, n_groups));
645 for (i = 0; i < n_groups; i++)
646 DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
647 (long int)groups[i]));
648 }
649
650 /*
651 * Create an artificial NT token given just a domain SID.
652 *
653 * We have 3 cases:
654 *
655 * unmapped unix users: Go directly to nss to find the user's group.
656 *
657 * A passdb user: The list of groups is provided by pdb_enum_group_memberships.
658 *
659 * If the user is provided by winbind, the primary gid is set to "domain
660 * users" of the user's domain. For an explanation why this is necessary, see
661 * the thread starting at
662 * http://lists.samba.org/archive/samba-technical/2006-January/044803.html.
663 */
664
665 static NTSTATUS create_token_from_sid(TALLOC_CTX *mem_ctx,
666 const struct dom_sid *user_sid,
667 bool is_guest,
668 uid_t *uid, gid_t *gid,
669 char **found_username,
670 struct security_token **token)
671 {
672 NTSTATUS result = NT_STATUS_NO_SUCH_USER;
673 TALLOC_CTX *tmp_ctx = talloc_stackframe();
674 gid_t *gids;
675 struct dom_sid *group_sids;
676 struct dom_sid tmp_sid;
677 uint32_t num_group_sids;
678 uint32_t num_gids;
679 uint32_t i;
680 uint32_t high, low;
681 bool range_ok;
682
683 if (sid_check_is_in_our_sam(user_sid)) {
684 bool ret;
685 uint32_t pdb_num_group_sids;
686 /* This is a passdb user, so ask passdb */
687
688 struct samu *sam_acct = NULL;
689
690 if ( !(sam_acct = samu_new( tmp_ctx )) ) {
691 result = NT_STATUS_NO_MEMORY;
692 goto done;
693 }
694
695 become_root();
696 ret = pdb_getsampwsid(sam_acct, user_sid);
697 unbecome_root();
698
699 if (!ret) {
700 DEBUG(1, ("pdb_getsampwsid(%s) failed\n",
701 sid_string_dbg(user_sid)));
702 DEBUGADD(1, ("Fall back to unix user\n"));
703 goto unix_user;
704 }
705
706 result = pdb_enum_group_memberships(tmp_ctx, sam_acct,
707 &group_sids, &gids,
708 &pdb_num_group_sids);
709 if (!NT_STATUS_IS_OK(result)) {
710 DEBUG(1, ("enum_group_memberships failed for %s: "
711 "%s\n", sid_string_dbg(user_sid),
712 nt_errstr(result)));
713 DEBUGADD(1, ("Fall back to unix uid lookup\n"));
714 goto unix_user;
715 }
716 num_group_sids = pdb_num_group_sids;
717
718 /* see the smb_panic() in pdb_default_enum_group_memberships */
719 SMB_ASSERT(num_group_sids > 0);
720
721 /* Ensure we're returning the found_username on the right context. */
722 *found_username = talloc_strdup(mem_ctx,
723 pdb_get_username(sam_acct));
724
725 if (*found_username == NULL) {
726 result = NT_STATUS_NO_MEMORY;
727 goto done;
728 }
729
730 /*
731 * If the SID from lookup_name() was the guest sid, passdb knows
732 * about the mapping of guest sid to lp_guest_account()
733 * username and will return the unix_pw info for a guest
734 * user. Use it if it's there, else lookup the *uid details
735 * using Get_Pwnam_alloc(). See bug #6291 for details. JRA.
736 */
737
738 /* We must always assign the *uid. */
739 if (sam_acct->unix_pw == NULL) {
740 struct passwd *pwd = Get_Pwnam_alloc(sam_acct, *found_username );
741 if (!pwd) {
742 DEBUG(10, ("Get_Pwnam_alloc failed for %s\n",
743 *found_username));
744 result = NT_STATUS_NO_SUCH_USER;
745 goto done;
746 }
747 result = samu_set_unix(sam_acct, pwd );
748 if (!NT_STATUS_IS_OK(result)) {
749 DEBUG(10, ("samu_set_unix failed for %s\n",
750 *found_username));
751 result = NT_STATUS_NO_SUCH_USER;
752 goto done;
753 }
754 }
755 *uid = sam_acct->unix_pw->pw_uid;
756
757 } else if (sid_check_is_in_unix_users(user_sid)) {
758 uint32_t getgroups_num_group_sids;
759 /* This is a unix user not in passdb. We need to ask nss
760 * directly, without consulting passdb */
761
762 struct passwd *pass;
763
764 /*
765 * This goto target is used as a fallback for the passdb
766 * case. The concrete bug report is when passdb gave us an
767 * unmapped gid.
768 */
769
770 unix_user:
771
772 if (!sid_to_uid(user_sid, uid)) {
773 DEBUG(1, ("unix_user case, sid_to_uid for %s failed\n",
774 sid_string_dbg(user_sid)));
775 result = NT_STATUS_NO_SUCH_USER;
776 goto done;
777 }
778
779 uid_to_unix_users_sid(*uid, &tmp_sid);
780 user_sid = &tmp_sid;
781
782 pass = getpwuid_alloc(tmp_ctx, *uid);
783 if (pass == NULL) {
784 DEBUG(1, ("getpwuid(%u) failed\n",
785 (unsigned int)*uid));
786 goto done;
787 }
788
789 if (!getgroups_unix_user(tmp_ctx, pass->pw_name, pass->pw_gid,
790 &gids, &getgroups_num_group_sids)) {
791 DEBUG(1, ("getgroups_unix_user for user %s failed\n",
792 pass->pw_name));
793 goto done;
794 }
795 num_group_sids = getgroups_num_group_sids;
796
797 group_sids = talloc_array(tmp_ctx, struct dom_sid, num_group_sids);
798 if (group_sids == NULL) {
799 DEBUG(1, ("talloc_array failed\n"));
800 result = NT_STATUS_NO_MEMORY;
801 goto done;
802 }
803
804 for (i=0; i<num_group_sids; i++) {
805 gid_to_sid(&group_sids[i], gids[i]);
806 }
807
808 /* In getgroups_unix_user we always set the primary gid */
809 SMB_ASSERT(num_group_sids > 0);
810
811 /* Ensure we're returning the found_username on the right context. */
812 *found_username = talloc_strdup(mem_ctx, pass->pw_name);
813 if (*found_username == NULL) {
814 result = NT_STATUS_NO_MEMORY;
815 goto done;
816 }
817 } else {
818
819 /* This user is from winbind, force the primary gid to the
820 * user's "domain users" group. Under certain circumstances
821 * (user comes from NT4), this might be a loss of
822 * information. But we can not rely on winbind getting the
823 * correct info. AD might prohibit winbind looking up that
824 * information. */
825
826 /* We must always assign the *uid. */
827 if (!sid_to_uid(user_sid, uid)) {
828 DEBUG(1, ("winbindd case, sid_to_uid for %s failed\n",
829 sid_string_dbg(user_sid)));
830 result = NT_STATUS_NO_SUCH_USER;
831 goto done;
832 }
833
834 num_group_sids = 1;
835 group_sids = talloc_array(tmp_ctx, struct dom_sid, num_group_sids);
836 if (group_sids == NULL) {
837 DEBUG(1, ("talloc_array failed\n"));
838 result = NT_STATUS_NO_MEMORY;
839 goto done;
840 }
841
842 gids = talloc_array(tmp_ctx, gid_t, num_group_sids);
843 if (gids == NULL) {
844 result = NT_STATUS_NO_MEMORY;
845 goto done;
846 }
847
848 sid_copy(&group_sids[0], user_sid);
849 sid_split_rid(&group_sids[0], NULL);
850 sid_append_rid(&group_sids[0], DOMAIN_RID_USERS);
851
852 if (!sid_to_gid(&group_sids[0], &gids[0])) {
853 DEBUG(1, ("sid_to_gid(%s) failed\n",
854 sid_string_dbg(&group_sids[0])));
855 goto done;
856 }
857
858 *found_username = NULL;
859 }
860
861 *gid = gids[0];
862
863 /* Add the "Unix Group" SID for each gid to catch mapped groups
864 and their Unix equivalent. This is to solve the backwards
865 compatibility problem of 'valid users = +ntadmin' where
866 ntadmin has been paired with "Domain Admins" in the group
867 mapping table. Otherwise smb.conf would need to be changed
868 to 'valid user = "Domain Admins"'. --jerry */
869
870 num_gids = num_group_sids;
871 range_ok = lp_idmap_default_range(&low, &high);
872 for ( i=0; i<num_gids; i++ ) {
873 struct dom_sid unix_group_sid;
874
875 /* don't pickup anything managed by Winbind */
876 if (range_ok && (gids[i] >= low) && (gids[i] <= high)) {
877 continue;
878 }
879
880 gid_to_unix_groups_sid(gids[i], &unix_group_sid);
881
882 result = add_sid_to_array_unique(tmp_ctx, &unix_group_sid,
883 &group_sids, &num_group_sids);
884 if (!NT_STATUS_IS_OK(result)) {
885 goto done;
886 }
887 }
888
889 /* Ensure we're creating the nt_token on the right context. */
890 *token = create_local_nt_token(mem_ctx, user_sid,
891 is_guest, num_group_sids, group_sids);
892
893 if (*token == NULL) {
894 result = NT_STATUS_NO_MEMORY;
895 goto done;
896 }
897
898 result = NT_STATUS_OK;
899 done:
900 TALLOC_FREE(tmp_ctx);
901 return result;
902 }
903
904 /*
905 * Create an artificial NT token given just a username. (Initially intended
906 * for force user)
907 *
908 * We go through lookup_name() to avoid problems we had with 'winbind use
909 * default domain'.
910 *
911 * We have 3 cases:
912 *
913 * unmapped unix users: Go directly to nss to find the user's group.
914 *
915 * A passdb user: The list of groups is provided by pdb_enum_group_memberships.
916 *
917 * If the user is provided by winbind, the primary gid is set to "domain
918 * users" of the user's domain. For an explanation why this is necessary, see
919 * the thread starting at
920 * http://lists.samba.org/archive/samba-technical/2006-January/044803.html.
921 */
922
923 NTSTATUS create_token_from_username(TALLOC_CTX *mem_ctx, const char *username,
924 bool is_guest,
925 uid_t *uid, gid_t *gid,
926 char **found_username,
927 struct security_token **token)
928 {
929 NTSTATUS result = NT_STATUS_NO_SUCH_USER;
930 TALLOC_CTX *tmp_ctx = talloc_stackframe();
931 struct dom_sid user_sid;
932 enum lsa_SidType type;
933
934 if (!lookup_name_smbconf(tmp_ctx, username, LOOKUP_NAME_ALL,
935 NULL, NULL, &user_sid, &type)) {
936 DEBUG(1, ("lookup_name_smbconf for %s failed\n", username));
937 goto done;
938 }
939
940 if (type != SID_NAME_USER) {
941 DEBUG(1, ("%s is a %s, not a user\n", username,
942 sid_type_lookup(type)));
943 goto done;
944 }
945
946 result = create_token_from_sid(mem_ctx, &user_sid, is_guest, uid, gid, found_username, token);
947
948 if (!NT_STATUS_IS_OK(result)) {
949 goto done;
950 }
951
952 /*
953 * If result == NT_STATUS_OK then
954 * we know we have a valid token. Ensure
955 * we also have a valid username to match.
956 */
957
958 if (*found_username == NULL) {
959 *found_username = talloc_strdup(mem_ctx, username);
960 if (*found_username == NULL) {
961 result = NT_STATUS_NO_MEMORY;
962 }
963 }
964
965 done:
966 TALLOC_FREE(tmp_ctx);
967 return result;
968 }
969
970 /***************************************************************************
971 Build upon create_token_from_sid:
972
973 Expensive helper function to figure out whether a user given its sid is
974 member of a particular group.
975 ***************************************************************************/
976
977 bool user_sid_in_group_sid(const struct dom_sid *sid, const struct dom_sid *group_sid)
978 {
979 NTSTATUS status;
980 uid_t uid;
981 gid_t gid;
982 char *found_username;
983 struct security_token *token;
984 bool result = false;
985 enum lsa_SidType type;
986 TALLOC_CTX *mem_ctx = talloc_stackframe();
987
988 if (!lookup_sid(mem_ctx, sid,
989 NULL, NULL, &type)) {
990 DEBUG(1, ("lookup_sid for %s failed\n", dom_sid_string(mem_ctx, sid)));
991 goto done;
992 }
993
994 if (type != SID_NAME_USER) {
995 DEBUG(5, ("%s is a %s, not a user\n", dom_sid_string(mem_ctx, sid),
996 sid_type_lookup(type)));
997 goto done;
998 }
999
1000 status = create_token_from_sid(mem_ctx, sid, False,
1001 &uid, &gid, &found_username,
1002 &token);
1003
1004 if (!NT_STATUS_IS_OK(status)) {
1005 DEBUG(10, ("could not create token for %s\n", dom_sid_string(mem_ctx, sid)));
1006 goto done;
1007 }
1008
1009 result = security_token_has_sid(token, group_sid);
1010
1011 done:
1012 TALLOC_FREE(mem_ctx);
1013 return result;
1014 }
1015
1016 /***************************************************************************
1017 Build upon create_token_from_username:
1018
1019 Expensive helper function to figure out whether a user given its name is
1020 member of a particular group.
1021 ***************************************************************************/
1022
1023 bool user_in_group_sid(const char *username, const struct dom_sid *group_sid)
1024 {
1025 NTSTATUS status;
1026 uid_t uid;
1027 gid_t gid;
1028 char *found_username;
1029 struct security_token *token;
1030 bool result;
1031 TALLOC_CTX *mem_ctx = talloc_stackframe();
1032
1033 status = create_token_from_username(mem_ctx, username, False,
1034 &uid, &gid, &found_username,
1035 &token);
1036
1037 if (!NT_STATUS_IS_OK(status)) {
1038 DEBUG(10, ("could not create token for %s\n", username));
1039 TALLOC_FREE(mem_ctx);
1040 return False;
1041 }
1042
1043 result = security_token_has_sid(token, group_sid);
1044
1045 TALLOC_FREE(mem_ctx);
1046 return result;
1047 }
1048
1049 bool user_in_group(const char *username, const char *groupname)
1050 {
1051 TALLOC_CTX *mem_ctx = talloc_stackframe();
1052 struct dom_sid group_sid;
1053 bool ret;
1054
1055 ret = lookup_name(mem_ctx, groupname, LOOKUP_NAME_ALL,
1056 NULL, NULL, &group_sid, NULL);
1057 TALLOC_FREE(mem_ctx);
1058
1059 if (!ret) {
1060 DEBUG(10, ("lookup_name for (%s) failed.\n", groupname));
1061 return False;
1062 }
1063
1064 return user_in_group_sid(username, &group_sid);
1065 }
1066
1067 /* END */
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