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ndr: add ndr_pull_charset_to_null()
[Samba.git] / source3 / auth / token_util.c
blobff55a671f37538aa8a8fa018a4e3af01a82458a1
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 "auth.h"
29 #include "secrets.h"
30 #include "memcache.h"
31 #include "../librpc/gen_ndr/netlogon.h"
32 #include "../libcli/security/security.h"
33 #include "../lib/util/util_pw.h"
34 #include "passdb.h"
35 #include "lib/privileges.h"
36
37 /****************************************************************************
38 Check for a SID in an struct security_token
39 ****************************************************************************/
40
41 bool nt_token_check_sid ( const struct dom_sid *sid, const struct security_token *token )
42 {
43 if ( !sid || !token )
44 return False;
45
46 return security_token_has_sid(token, sid);
47 }
48
49 bool nt_token_check_domain_rid( struct security_token *token, uint32 rid )
50 {
51 struct dom_sid domain_sid;
52
53 /* if we are a domain member, the get the domain SID, else for
54 a DC or standalone server, use our own SID */
55
56 if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
57 if ( !secrets_fetch_domain_sid( lp_workgroup(),
58 &domain_sid ) ) {
59 DEBUG(1,("nt_token_check_domain_rid: Cannot lookup "
60 "SID for domain [%s]\n", lp_workgroup()));
61 return False;
62 }
63 }
64 else
65 sid_copy( &domain_sid, get_global_sam_sid() );
66
67 sid_append_rid( &domain_sid, rid );
68
69 return nt_token_check_sid( &domain_sid, token );\
70 }
71
72 /******************************************************************************
73 Create a token for the root user to be used internally by smbd.
74 This is similar to running under the context of the LOCAL_SYSTEM account
75 in Windows. This is a read-only token. Do not modify it or free() it.
76 Create a copy if you need to change it.
77 ******************************************************************************/
78
79 struct security_token *get_root_nt_token( void )
80 {
81 struct security_token *token, *for_cache;
82 struct dom_sid u_sid, g_sid;
83 struct passwd *pw;
84 void *cache_data;
85
86 cache_data = memcache_lookup_talloc(
87 NULL, SINGLETON_CACHE_TALLOC,
88 data_blob_string_const_null("root_nt_token"));
89
90 if (cache_data != NULL) {
91 return talloc_get_type_abort(
92 cache_data, struct security_token);
93 }
94
95 if ( !(pw = sys_getpwuid(0)) ) {
96 if ( !(pw = sys_getpwnam("root")) ) {
97 DEBUG(0,("get_root_nt_token: both sys_getpwuid(0) "
98 "and sys_getpwnam(\"root\") failed!\n"));
99 return NULL;
100 }
101 }
102
103 /* get the user and primary group SIDs; although the
104 BUILTIN\Administrators SId is really the one that matters here */
105
106 uid_to_sid(&u_sid, pw->pw_uid);
107 gid_to_sid(&g_sid, pw->pw_gid);
108
109 token = create_local_nt_token(talloc_tos(), &u_sid, False,
110 1, &global_sid_Builtin_Administrators);
111
112 security_token_set_privilege(token, SEC_PRIV_DISK_OPERATOR);
113
114 for_cache = token;
115
116 memcache_add_talloc(
117 NULL, SINGLETON_CACHE_TALLOC,
118 data_blob_string_const_null("root_nt_token"), &for_cache);
119
120 return token;
121 }
122
123
124 /*
125 * Add alias SIDs from memberships within the partially created token SID list
126 */
127
128 NTSTATUS add_aliases(const struct dom_sid *domain_sid,
129 struct security_token *token)
130 {
131 uint32 *aliases;
132 size_t i, num_aliases;
133 NTSTATUS status;
134 TALLOC_CTX *tmp_ctx;
135
136 if (!(tmp_ctx = talloc_init("add_aliases"))) {
137 return NT_STATUS_NO_MEMORY;
138 }
139
140 aliases = NULL;
141 num_aliases = 0;
142
143 status = pdb_enum_alias_memberships(tmp_ctx, domain_sid,
144 token->sids,
145 token->num_sids,
146 &aliases, &num_aliases);
147
148 if (!NT_STATUS_IS_OK(status)) {
149 DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n",
150 nt_errstr(status)));
151 goto done;
152 }
153
154 for (i=0; i<num_aliases; i++) {
155 struct dom_sid alias_sid;
156 sid_compose(&alias_sid, domain_sid, aliases[i]);
157 status = add_sid_to_array_unique(token, &alias_sid,
158 &token->sids,
159 &token->num_sids);
160 if (!NT_STATUS_IS_OK(status)) {
161 DEBUG(0, ("add_sid_to_array failed\n"));
162 goto done;
163 }
164 }
165
166 done:
167 TALLOC_FREE(tmp_ctx);
168 return NT_STATUS_OK;
169 }
170
171 /*******************************************************************
172 *******************************************************************/
173
174 static NTSTATUS add_builtin_administrators(struct security_token *token,
175 const struct dom_sid *dom_sid)
176 {
177 struct dom_sid domadm;
178 NTSTATUS status;
179
180 /* nothing to do if we aren't in a domain */
181
182 if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) {
183 return NT_STATUS_OK;
184 }
185
186 /* Find the Domain Admins SID */
187
188 if ( IS_DC ) {
189 sid_copy( &domadm, get_global_sam_sid() );
190 } else {
191 sid_copy(&domadm, dom_sid);
192 }
193 sid_append_rid( &domadm, DOMAIN_RID_ADMINS );
194
195 /* Add Administrators if the user beloongs to Domain Admins */
196
197 if ( nt_token_check_sid( &domadm, token ) ) {
198 status = add_sid_to_array(token,
199 &global_sid_Builtin_Administrators,
200 &token->sids, &token->num_sids);
201 if (!NT_STATUS_IS_OK(status)) {
202 return status;
203 }
204 }
205
206 return NT_STATUS_OK;
207 }
208
209 static NTSTATUS finalize_local_nt_token(struct security_token *result,
210 bool is_guest);
211
212 NTSTATUS create_local_nt_token_from_info3(TALLOC_CTX *mem_ctx,
213 bool is_guest,
214 struct netr_SamInfo3 *info3,
215 struct extra_auth_info *extra,
216 struct security_token **ntok)
217 {
218 struct security_token *usrtok = NULL;
219 NTSTATUS status;
220 int i;
221
222 DEBUG(10, ("Create local NT token for %s\n",
223 info3->base.account_name.string));
224
225 usrtok = talloc_zero(mem_ctx, struct security_token);
226 if (!usrtok) {
227 DEBUG(0, ("talloc failed\n"));
228 return NT_STATUS_NO_MEMORY;
229 }
230
231 /* Add the user and primary group sid FIRST */
232 /* check if the user rid is the special "Domain Guests" rid.
233 * If so pick the first sid for the extra sids instead as it
234 * is a local fake account */
235 usrtok->sids = talloc_array(usrtok, struct dom_sid, 2);
236 if (!usrtok->sids) {
237 TALLOC_FREE(usrtok);
238 return NT_STATUS_NO_MEMORY;
239 }
240 usrtok->num_sids = 2;
241
242 /* USER SID */
243 if (info3->base.rid == (uint32_t)(-1)) {
244 /* this is a signal the user was fake and generated,
245 * the actual SID we want to use is stored in the extra
246 * sids */
247 if (is_null_sid(&extra->user_sid)) {
248 /* we couldn't find the user sid, bail out */
249 DEBUG(3, ("Invalid user SID\n"));
250 TALLOC_FREE(usrtok);
251 return NT_STATUS_UNSUCCESSFUL;
252 }
253 sid_copy(&usrtok->sids[0], &extra->user_sid);
254 } else {
255 sid_copy(&usrtok->sids[0], info3->base.domain_sid);
256 sid_append_rid(&usrtok->sids[0], info3->base.rid);
257 }
258
259 /* GROUP SID */
260 if (info3->base.primary_gid == (uint32_t)(-1)) {
261 /* this is a signal the user was fake and generated,
262 * the actual SID we want to use is stored in the extra
263 * sids */
264 if (is_null_sid(&extra->pgid_sid)) {
265 /* we couldn't find the user sid, bail out */
266 DEBUG(3, ("Invalid group SID\n"));
267 TALLOC_FREE(usrtok);
268 return NT_STATUS_UNSUCCESSFUL;
269 }
270 sid_copy(&usrtok->sids[1], &extra->pgid_sid);
271 } else {
272 sid_copy(&usrtok->sids[1], info3->base.domain_sid);
273 sid_append_rid(&usrtok->sids[1],
274 info3->base.primary_gid);
275 }
276
277 /* Now the SIDs we got from authentication. These are the ones from
278 * the info3 struct or from the pdb_enum_group_memberships, depending
279 * on who authenticated the user.
280 * Note that we start the for loop at "1" here, we already added the
281 * first group sid as primary above. */
282
283 for (i = 0; i < info3->base.groups.count; i++) {
284 struct dom_sid tmp_sid;
285
286 sid_copy(&tmp_sid, info3->base.domain_sid);
287 sid_append_rid(&tmp_sid, info3->base.groups.rids[i].rid);
288
289 status = add_sid_to_array_unique(usrtok, &tmp_sid,
290 &usrtok->sids,
291 &usrtok->num_sids);
292 if (!NT_STATUS_IS_OK(status)) {
293 DEBUG(3, ("Failed to add SID to nt token\n"));
294 TALLOC_FREE(usrtok);
295 return status;
296 }
297 }
298
299 /* now also add extra sids if they are not the special user/group
300 * sids */
301 for (i = 0; i < info3->sidcount; i++) {
302 status = add_sid_to_array_unique(usrtok,
303 info3->sids[i].sid,
304 &usrtok->sids,
305 &usrtok->num_sids);
306 if (!NT_STATUS_IS_OK(status)) {
307 DEBUG(3, ("Failed to add SID to nt token\n"));
308 TALLOC_FREE(usrtok);
309 return status;
310 }
311 }
312
313 status = finalize_local_nt_token(usrtok, is_guest);
314 if (!NT_STATUS_IS_OK(status)) {
315 DEBUG(3, ("Failed to finalize nt token\n"));
316 TALLOC_FREE(usrtok);
317 return status;
318 }
319
320 *ntok = usrtok;
321 return NT_STATUS_OK;
322 }
323
324 /*******************************************************************
325 Create a NT token for the user, expanding local aliases
326 *******************************************************************/
327
328 struct security_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
329 const struct dom_sid *user_sid,
330 bool is_guest,
331 int num_groupsids,
332 const struct dom_sid *groupsids)
333 {
334 struct security_token *result = NULL;
335 int i;
336 NTSTATUS status;
337
338 DEBUG(10, ("Create local NT token for %s\n",
339 sid_string_dbg(user_sid)));
340
341 if (!(result = TALLOC_ZERO_P(mem_ctx, struct security_token))) {
342 DEBUG(0, ("talloc failed\n"));
343 return NULL;
344 }
345
346 /* Add the user and primary group sid */
347
348 status = add_sid_to_array(result, user_sid,
349 &result->sids, &result->num_sids);
350 if (!NT_STATUS_IS_OK(status)) {
351 TALLOC_FREE(result);
352 return NULL;
353 }
354
355 /* For guest, num_groupsids may be zero. */
356 if (num_groupsids) {
357 status = add_sid_to_array(result, &groupsids[0],
358 &result->sids,
359 &result->num_sids);
360 if (!NT_STATUS_IS_OK(status)) {
361 TALLOC_FREE(result);
362 return NULL;
363 }
364 }
365
366 /* Now the SIDs we got from authentication. These are the ones from
367 * the info3 struct or from the pdb_enum_group_memberships, depending
368 * on who authenticated the user.
369 * Note that we start the for loop at "1" here, we already added the
370 * first group sid as primary above. */
371
372 for (i=1; i<num_groupsids; i++) {
373 status = add_sid_to_array_unique(result, &groupsids[i],
374 &result->sids,
375 &result->num_sids);
376 if (!NT_STATUS_IS_OK(status)) {
377 TALLOC_FREE(result);
378 return NULL;
379 }
380 }
381
382 status = finalize_local_nt_token(result, is_guest);
383 if (!NT_STATUS_IS_OK(status)) {
384 TALLOC_FREE(result);
385 return NULL;
386 }
387
388 return result;
389 }
390
391 static NTSTATUS finalize_local_nt_token(struct security_token *result,
392 bool is_guest)
393 {
394 struct dom_sid dom_sid;
395 gid_t gid;
396 NTSTATUS status;
397
398 /* Add in BUILTIN sids */
399
400 status = add_sid_to_array(result, &global_sid_World,
401 &result->sids, &result->num_sids);
402 if (!NT_STATUS_IS_OK(status)) {
403 return status;
404 }
405 status = add_sid_to_array(result, &global_sid_Network,
406 &result->sids, &result->num_sids);
407 if (!NT_STATUS_IS_OK(status)) {
408 return status;
409 }
410
411 if (is_guest) {
412 status = add_sid_to_array(result, &global_sid_Builtin_Guests,
413 &result->sids,
414 &result->num_sids);
415 if (!NT_STATUS_IS_OK(status)) {
416 return status;
417 }
418 } else {
419 status = add_sid_to_array(result,
420 &global_sid_Authenticated_Users,
421 &result->sids,
422 &result->num_sids);
423 if (!NT_STATUS_IS_OK(status)) {
424 return status;
425 }
426 }
427
428 /* Deal with the BUILTIN\Administrators group. If the SID can
429 be resolved then assume that the add_aliasmem( S-1-5-32 )
430 handled it. */
431
432 if (!sid_to_gid(&global_sid_Builtin_Administrators, &gid)) {
433
434 become_root();
435 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
436 status = NT_STATUS_OK;
437 DEBUG(3, ("Failed to fetch domain sid for %s\n",
438 lp_workgroup()));
439 } else {
440 status = create_builtin_administrators(&dom_sid);
441 }
442 unbecome_root();
443
444 if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) {
445 /* Add BUILTIN\Administrators directly to token. */
446 status = add_builtin_administrators(result, &dom_sid);
447 if ( !NT_STATUS_IS_OK(status) ) {
448 DEBUG(3, ("Failed to check for local "
449 "Administrators membership (%s)\n",
450 nt_errstr(status)));
451 }
452 } else if (!NT_STATUS_IS_OK(status)) {
453 DEBUG(2, ("WARNING: Failed to create "
454 "BUILTIN\\Administrators group! Can "
455 "Winbind allocate gids?\n"));
456 }
457 }
458
459 /* Deal with the BUILTIN\Users group. If the SID can
460 be resolved then assume that the add_aliasmem( S-1-5-32 )
461 handled it. */
462
463 if (!sid_to_gid(&global_sid_Builtin_Users, &gid)) {
464
465 become_root();
466 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
467 status = NT_STATUS_OK;
468 DEBUG(3, ("Failed to fetch domain sid for %s\n",
469 lp_workgroup()));
470 } else {
471 status = create_builtin_users(&dom_sid);
472 }
473 unbecome_root();
474
475 if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) &&
476 !NT_STATUS_IS_OK(status))
477 {
478 DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! "
479 "Can Winbind allocate gids?\n"));
480 }
481 }
482
483 /* Deal with local groups */
484
485 if (lp_winbind_nested_groups()) {
486
487 become_root();
488
489 /* Now add the aliases. First the one from our local SAM */
490
491 status = add_aliases(get_global_sam_sid(), result);
492
493 if (!NT_STATUS_IS_OK(status)) {
494 unbecome_root();
495 return status;
496 }
497
498 /* Finally the builtin ones */
499
500 status = add_aliases(&global_sid_Builtin, result);
501
502 if (!NT_STATUS_IS_OK(status)) {
503 unbecome_root();
504 return status;
505 }
506
507 unbecome_root();
508 }
509
510 /* Add privileges based on current user sids */
511
512 get_privileges_for_sids(&result->privilege_mask, result->sids,
513 result->num_sids);
514
515 return NT_STATUS_OK;
516 }
517
518 /****************************************************************************
519 prints a UNIX 'token' to debug output.
520 ****************************************************************************/
521
522 void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
523 int n_groups, gid_t *groups)
524 {
525 int i;
526 DEBUGC(dbg_class, dbg_lev,
527 ("UNIX token of user %ld\n", (long int)uid));
528
529 DEBUGADDC(dbg_class, dbg_lev,
530 ("Primary group is %ld and contains %i supplementary "
531 "groups\n", (long int)gid, n_groups));
532 for (i = 0; i < n_groups; i++)
533 DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
534 (long int)groups[i]));
535 }
536
537 /*
538 * Create an artificial NT token given just a username. (Initially intended
539 * for force user)
540 *
541 * We go through lookup_name() to avoid problems we had with 'winbind use
542 * default domain'.
543 *
544 * We have 3 cases:
545 *
546 * unmapped unix users: Go directly to nss to find the user's group.
547 *
548 * A passdb user: The list of groups is provided by pdb_enum_group_memberships.
549 *
550 * If the user is provided by winbind, the primary gid is set to "domain
551 * users" of the user's domain. For an explanation why this is necessary, see
552 * the thread starting at
553 * http://lists.samba.org/archive/samba-technical/2006-January/044803.html.
554 */
555
556 NTSTATUS create_token_from_username(TALLOC_CTX *mem_ctx, const char *username,
557 bool is_guest,
558 uid_t *uid, gid_t *gid,
559 char **found_username,
560 struct security_token **token)
561 {
562 NTSTATUS result = NT_STATUS_NO_SUCH_USER;
563 TALLOC_CTX *tmp_ctx = talloc_stackframe();
564 struct dom_sid user_sid;
565 enum lsa_SidType type;
566 gid_t *gids;
567 struct dom_sid *group_sids;
568 struct dom_sid unix_group_sid;
569 uint32_t num_group_sids;
570 uint32_t num_gids;
571 uint32_t i;
572
573 if (!lookup_name_smbconf(tmp_ctx, username, LOOKUP_NAME_ALL,
574 NULL, NULL, &user_sid, &type)) {
575 DEBUG(1, ("lookup_name_smbconf for %s failed\n", username));
576 goto done;
577 }
578
579 if (type != SID_NAME_USER) {
580 DEBUG(1, ("%s is a %s, not a user\n", username,
581 sid_type_lookup(type)));
582 goto done;
583 }
584
585 if (sid_check_is_in_our_domain(&user_sid)) {
586 bool ret;
587 uint32_t pdb_num_group_sids;
588 /* This is a passdb user, so ask passdb */
589
590 struct samu *sam_acct = NULL;
591
592 if ( !(sam_acct = samu_new( tmp_ctx )) ) {
593 result = NT_STATUS_NO_MEMORY;
594 goto done;
595 }
596
597 become_root();
598 ret = pdb_getsampwsid(sam_acct, &user_sid);
599 unbecome_root();
600
601 if (!ret) {
602 DEBUG(1, ("pdb_getsampwsid(%s) for user %s failed\n",
603 sid_string_dbg(&user_sid), username));
604 DEBUGADD(1, ("Fall back to unix user %s\n", username));
605 goto unix_user;
606 }
607
608 result = pdb_enum_group_memberships(tmp_ctx, sam_acct,
609 &group_sids, &gids,
610 &pdb_num_group_sids);
611 if (!NT_STATUS_IS_OK(result)) {
612 DEBUG(1, ("enum_group_memberships failed for %s (%s): "
613 "%s\n", username, sid_string_dbg(&user_sid),
614 nt_errstr(result)));
615 DEBUGADD(1, ("Fall back to unix user %s\n", username));
616 goto unix_user;
617 }
618 num_group_sids = pdb_num_group_sids;
619
620 /* see the smb_panic() in pdb_default_enum_group_memberships */
621 SMB_ASSERT(num_group_sids > 0);
622
623 *gid = gids[0];
624
625 /* Ensure we're returning the found_username on the right context. */
626 *found_username = talloc_strdup(mem_ctx,
627 pdb_get_username(sam_acct));
628
629 /*
630 * If the SID from lookup_name() was the guest sid, passdb knows
631 * about the mapping of guest sid to lp_guestaccount()
632 * username and will return the unix_pw info for a guest
633 * user. Use it if it's there, else lookup the *uid details
634 * using Get_Pwnam_alloc(). See bug #6291 for details. JRA.
635 */
636
637 /* We must always assign the *uid. */
638 if (sam_acct->unix_pw == NULL) {
639 struct passwd *pwd = Get_Pwnam_alloc(sam_acct, *found_username );
640 if (!pwd) {
641 DEBUG(10, ("Get_Pwnam_alloc failed for %s\n",
642 *found_username));
643 result = NT_STATUS_NO_SUCH_USER;
644 goto done;
645 }
646 result = samu_set_unix(sam_acct, pwd );
647 if (!NT_STATUS_IS_OK(result)) {
648 DEBUG(10, ("samu_set_unix failed for %s\n",
649 *found_username));
650 result = NT_STATUS_NO_SUCH_USER;
651 goto done;
652 }
653 }
654 *uid = sam_acct->unix_pw->pw_uid;
655
656 } else if (sid_check_is_in_unix_users(&user_sid)) {
657 uint32_t getgroups_num_group_sids;
658 /* This is a unix user not in passdb. We need to ask nss
659 * directly, without consulting passdb */
660
661 struct passwd *pass;
662
663 /*
664 * This goto target is used as a fallback for the passdb
665 * case. The concrete bug report is when passdb gave us an
666 * unmapped gid.
667 */
668
669 unix_user:
670
671 if (!sid_to_uid(&user_sid, uid)) {
672 DEBUG(1, ("unix_user case, sid_to_uid for %s (%s) failed\n",
673 username, sid_string_dbg(&user_sid)));
674 result = NT_STATUS_NO_SUCH_USER;
675 goto done;
676 }
677
678 uid_to_unix_users_sid(*uid, &user_sid);
679
680 pass = getpwuid_alloc(tmp_ctx, *uid);
681 if (pass == NULL) {
682 DEBUG(1, ("getpwuid(%u) for user %s failed\n",
683 (unsigned int)*uid, username));
684 goto done;
685 }
686
687 if (!getgroups_unix_user(tmp_ctx, username, pass->pw_gid,
688 &gids, &getgroups_num_group_sids)) {
689 DEBUG(1, ("getgroups_unix_user for user %s failed\n",
690 username));
691 goto done;
692 }
693 num_group_sids = getgroups_num_group_sids;
694
695 if (num_group_sids) {
696 group_sids = TALLOC_ARRAY(tmp_ctx, struct dom_sid, num_group_sids);
697 if (group_sids == NULL) {
698 DEBUG(1, ("TALLOC_ARRAY failed\n"));
699 result = NT_STATUS_NO_MEMORY;
700 goto done;
701 }
702 } else {
703 group_sids = NULL;
704 }
705
706 for (i=0; i<num_group_sids; i++) {
707 gid_to_sid(&group_sids[i], gids[i]);
708 }
709
710 /* In getgroups_unix_user we always set the primary gid */
711 SMB_ASSERT(num_group_sids > 0);
712
713 *gid = gids[0];
714
715 /* Ensure we're returning the found_username on the right context. */
716 *found_username = talloc_strdup(mem_ctx, pass->pw_name);
717 } else {
718
719 /* This user is from winbind, force the primary gid to the
720 * user's "domain users" group. Under certain circumstances
721 * (user comes from NT4), this might be a loss of
722 * information. But we can not rely on winbind getting the
723 * correct info. AD might prohibit winbind looking up that
724 * information. */
725
726 /* We must always assign the *uid. */
727 if (!sid_to_uid(&user_sid, uid)) {
728 DEBUG(1, ("winbindd case, sid_to_uid for %s (%s) failed\n",
729 username, sid_string_dbg(&user_sid)));
730 result = NT_STATUS_NO_SUCH_USER;
731 goto done;
732 }
733
734 num_group_sids = 1;
735 group_sids = TALLOC_ARRAY(tmp_ctx, struct dom_sid, num_group_sids);
736 if (group_sids == NULL) {
737 DEBUG(1, ("TALLOC_ARRAY failed\n"));
738 result = NT_STATUS_NO_MEMORY;
739 goto done;
740 }
741
742 sid_copy(&group_sids[0], &user_sid);
743 sid_split_rid(&group_sids[0], NULL);
744 sid_append_rid(&group_sids[0], DOMAIN_RID_USERS);
745
746 if (!sid_to_gid(&group_sids[0], gid)) {
747 DEBUG(1, ("sid_to_gid(%s) failed\n",
748 sid_string_dbg(&group_sids[0])));
749 goto done;
750 }
751
752 gids = gid;
753
754 /* Ensure we're returning the found_username on the right context. */
755 *found_username = talloc_strdup(mem_ctx, username);
756 }
757
758 /* Add the "Unix Group" SID for each gid to catch mapped groups
759 and their Unix equivalent. This is to solve the backwards
760 compatibility problem of 'valid users = +ntadmin' where
761 ntadmin has been paired with "Domain Admins" in the group
762 mapping table. Otherwise smb.conf would need to be changed
763 to 'valid user = "Domain Admins"'. --jerry */
764
765 num_gids = num_group_sids;
766 for ( i=0; i<num_gids; i++ ) {
767 gid_t high, low;
768
769 /* don't pickup anything managed by Winbind */
770
771 if ( lp_idmap_gid(&low, &high) && (gids[i] >= low) && (gids[i] <= high) )
772 continue;
773
774 gid_to_unix_groups_sid(gids[i], &unix_group_sid);
775
776 result = add_sid_to_array_unique(tmp_ctx, &unix_group_sid,
777 &group_sids, &num_group_sids);
778 if (!NT_STATUS_IS_OK(result)) {
779 goto done;
780 }
781 }
782
783 /* Ensure we're creating the nt_token on the right context. */
784 *token = create_local_nt_token(mem_ctx, &user_sid,
785 is_guest, num_group_sids, group_sids);
786
787 if ((*token == NULL) || (*found_username == NULL)) {
788 result = NT_STATUS_NO_MEMORY;
789 goto done;
790 }
791
792 result = NT_STATUS_OK;
793 done:
794 TALLOC_FREE(tmp_ctx);
795 return result;
796 }
797
798 /***************************************************************************
799 Build upon create_token_from_username:
800
801 Expensive helper function to figure out whether a user given its name is
802 member of a particular group.
803 ***************************************************************************/
804
805 bool user_in_group_sid(const char *username, const struct dom_sid *group_sid)
806 {
807 NTSTATUS status;
808 uid_t uid;
809 gid_t gid;
810 char *found_username;
811 struct security_token *token;
812 bool result;
813 TALLOC_CTX *mem_ctx = talloc_stackframe();
814
815 status = create_token_from_username(mem_ctx, username, False,
816 &uid, &gid, &found_username,
817 &token);
818
819 if (!NT_STATUS_IS_OK(status)) {
820 DEBUG(10, ("could not create token for %s\n", username));
821 TALLOC_FREE(mem_ctx);
822 return False;
823 }
824
825 result = security_token_has_sid(token, group_sid);
826
827 TALLOC_FREE(mem_ctx);
828 return result;
829 }
830
831 bool user_in_group(const char *username, const char *groupname)
832 {
833 TALLOC_CTX *mem_ctx = talloc_stackframe();
834 struct dom_sid group_sid;
835 bool ret;
836
837 ret = lookup_name(mem_ctx, groupname, LOOKUP_NAME_ALL,
838 NULL, NULL, &group_sid, NULL);
839 TALLOC_FREE(mem_ctx);
840
841 if (!ret) {
842 DEBUG(10, ("lookup_name for (%s) failed.\n", groupname));
843 return False;
844 }
845
846 return user_in_group_sid(username, &group_sid);
847 }
848
849 /* END */
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