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release-scripts: add build-htmlman-nogit
[Samba.git] / source3 / auth / token_util.c
blob4a702ef23047fab309e12ea61535e9d626475200
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
33 /****************************************************************************
34 Check for a SID in an struct security_token
35 ****************************************************************************/
36
37 bool nt_token_check_sid ( const struct dom_sid *sid, const struct security_token *token )
38 {
39 if ( !sid || !token )
40 return False;
41
42 return security_token_has_sid(token, sid);
43 }
44
45 bool nt_token_check_domain_rid( struct security_token *token, uint32 rid )
46 {
47 struct dom_sid domain_sid;
48
49 /* if we are a domain member, the get the domain SID, else for
50 a DC or standalone server, use our own SID */
51
52 if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
53 if ( !secrets_fetch_domain_sid( lp_workgroup(),
54 &domain_sid ) ) {
55 DEBUG(1,("nt_token_check_domain_rid: Cannot lookup "
56 "SID for domain [%s]\n", lp_workgroup()));
57 return False;
58 }
59 }
60 else
61 sid_copy( &domain_sid, get_global_sam_sid() );
62
63 sid_append_rid( &domain_sid, rid );
64
65 return nt_token_check_sid( &domain_sid, token );\
66 }
67
68 /******************************************************************************
69 Create a token for the root user to be used internally by smbd.
70 This is similar to running under the context of the LOCAL_SYSTEM account
71 in Windows. This is a read-only token. Do not modify it or free() it.
72 Create a copy if you need to change it.
73 ******************************************************************************/
74
75 struct security_token *get_root_nt_token( void )
76 {
77 struct security_token *token, *for_cache;
78 struct dom_sid u_sid, g_sid;
79 struct passwd *pw;
80 void *cache_data;
81
82 cache_data = memcache_lookup_talloc(
83 NULL, SINGLETON_CACHE_TALLOC,
84 data_blob_string_const_null("root_nt_token"));
85
86 if (cache_data != NULL) {
87 return talloc_get_type_abort(
88 cache_data, struct security_token);
89 }
90
91 if ( !(pw = sys_getpwuid(0)) ) {
92 if ( !(pw = sys_getpwnam("root")) ) {
93 DEBUG(0,("get_root_nt_token: both sys_getpwuid(0) "
94 "and sys_getpwnam(\"root\") failed!\n"));
95 return NULL;
96 }
97 }
98
99 /* get the user and primary group SIDs; although the
100 BUILTIN\Administrators SId is really the one that matters here */
101
102 uid_to_sid(&u_sid, pw->pw_uid);
103 gid_to_sid(&g_sid, pw->pw_gid);
104
105 token = create_local_nt_token(talloc_tos(), &u_sid, False,
106 1, &global_sid_Builtin_Administrators);
107
108 security_token_set_privilege(token, SEC_PRIV_DISK_OPERATOR);
109
110 for_cache = token;
111
112 memcache_add_talloc(
113 NULL, SINGLETON_CACHE_TALLOC,
114 data_blob_string_const_null("root_nt_token"), &for_cache);
115
116 return token;
117 }
118
119
120 /*
121 * Add alias SIDs from memberships within the partially created token SID list
122 */
123
124 NTSTATUS add_aliases(const struct dom_sid *domain_sid,
125 struct security_token *token)
126 {
127 uint32 *aliases;
128 size_t i, num_aliases;
129 NTSTATUS status;
130 TALLOC_CTX *tmp_ctx;
131
132 if (!(tmp_ctx = talloc_init("add_aliases"))) {
133 return NT_STATUS_NO_MEMORY;
134 }
135
136 aliases = NULL;
137 num_aliases = 0;
138
139 status = pdb_enum_alias_memberships(tmp_ctx, domain_sid,
140 token->sids,
141 token->num_sids,
142 &aliases, &num_aliases);
143
144 if (!NT_STATUS_IS_OK(status)) {
145 DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n",
146 nt_errstr(status)));
147 goto done;
148 }
149
150 for (i=0; i<num_aliases; i++) {
151 struct dom_sid alias_sid;
152 sid_compose(&alias_sid, domain_sid, aliases[i]);
153 status = add_sid_to_array_unique(token, &alias_sid,
154 &token->sids,
155 &token->num_sids);
156 if (!NT_STATUS_IS_OK(status)) {
157 DEBUG(0, ("add_sid_to_array failed\n"));
158 goto done;
159 }
160 }
161
162 done:
163 TALLOC_FREE(tmp_ctx);
164 return NT_STATUS_OK;
165 }
166
167 /*******************************************************************
168 *******************************************************************/
169
170 static NTSTATUS add_builtin_administrators(struct security_token *token,
171 const struct dom_sid *dom_sid)
172 {
173 struct dom_sid domadm;
174 NTSTATUS status;
175
176 /* nothing to do if we aren't in a domain */
177
178 if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) {
179 return NT_STATUS_OK;
180 }
181
182 /* Find the Domain Admins SID */
183
184 if ( IS_DC ) {
185 sid_copy( &domadm, get_global_sam_sid() );
186 } else {
187 sid_copy(&domadm, dom_sid);
188 }
189 sid_append_rid( &domadm, DOMAIN_RID_ADMINS );
190
191 /* Add Administrators if the user beloongs to Domain Admins */
192
193 if ( nt_token_check_sid( &domadm, token ) ) {
194 status = add_sid_to_array(token,
195 &global_sid_Builtin_Administrators,
196 &token->sids, &token->num_sids);
197 if (!NT_STATUS_IS_OK(status)) {
198 return status;
199 }
200 }
201
202 return NT_STATUS_OK;
203 }
204
205 /**
206 * Create the requested BUILTIN if it doesn't already exist. This requires
207 * winbindd to be running.
208 *
209 * @param[in] rid BUILTIN rid to create
210 * @return Normal NTSTATUS return.
211 */
212 static NTSTATUS create_builtin(uint32 rid)
213 {
214 NTSTATUS status = NT_STATUS_OK;
215 struct dom_sid sid;
216 gid_t gid;
217
218 if (!sid_compose(&sid, &global_sid_Builtin, rid)) {
219 return NT_STATUS_NO_SUCH_ALIAS;
220 }
221
222 if (!sid_to_gid(&sid, &gid)) {
223 if (!lp_winbind_nested_groups() || !winbind_ping()) {
224 return NT_STATUS_PROTOCOL_UNREACHABLE;
225 }
226 status = pdb_create_builtin_alias(rid);
227 }
228 return status;
229 }
230
231 /**
232 * Add sid as a member of builtin_sid.
233 *
234 * @param[in] builtin_sid An existing builtin group.
235 * @param[in] dom_sid sid to add as a member of builtin_sid.
236 * @return Normal NTSTATUS return
237 */
238 static NTSTATUS add_sid_to_builtin(const struct dom_sid *builtin_sid,
239 const struct dom_sid *dom_sid)
240 {
241 NTSTATUS status = NT_STATUS_OK;
242
243 if (!dom_sid || !builtin_sid) {
244 return NT_STATUS_INVALID_PARAMETER;
245 }
246
247 status = pdb_add_aliasmem(builtin_sid, dom_sid);
248
249 if (NT_STATUS_EQUAL(status, NT_STATUS_MEMBER_IN_ALIAS)) {
250 DEBUG(5, ("add_sid_to_builtin %s is already a member of %s\n",
251 sid_string_dbg(dom_sid),
252 sid_string_dbg(builtin_sid)));
253 return NT_STATUS_OK;
254 }
255
256 if (!NT_STATUS_IS_OK(status)) {
257 DEBUG(4, ("add_sid_to_builtin %s could not be added to %s: "
258 "%s\n", sid_string_dbg(dom_sid),
259 sid_string_dbg(builtin_sid), nt_errstr(status)));
260 }
261 return status;
262 }
263
264 /*******************************************************************
265 *******************************************************************/
266
267 NTSTATUS create_builtin_users(const struct dom_sid *dom_sid)
268 {
269 NTSTATUS status;
270 struct dom_sid dom_users;
271
272 status = create_builtin(BUILTIN_RID_USERS);
273 if ( !NT_STATUS_IS_OK(status) ) {
274 DEBUG(5,("create_builtin_users: Failed to create Users\n"));
275 return status;
276 }
277
278 /* add domain users */
279 if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
280 && sid_compose(&dom_users, dom_sid, DOMAIN_RID_USERS))
281 {
282 status = add_sid_to_builtin(&global_sid_Builtin_Users,
283 &dom_users);
284 }
285
286 return status;
287 }
288
289 /*******************************************************************
290 *******************************************************************/
291
292 NTSTATUS create_builtin_administrators(const struct dom_sid *dom_sid)
293 {
294 NTSTATUS status;
295 struct dom_sid dom_admins, root_sid;
296 fstring root_name;
297 enum lsa_SidType type;
298 TALLOC_CTX *ctx;
299 bool ret;
300
301 status = create_builtin(BUILTIN_RID_ADMINISTRATORS);
302 if ( !NT_STATUS_IS_OK(status) ) {
303 DEBUG(5,("create_builtin_administrators: Failed to create Administrators\n"));
304 return status;
305 }
306
307 /* add domain admins */
308 if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
309 && sid_compose(&dom_admins, dom_sid, DOMAIN_RID_ADMINS))
310 {
311 status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
312 &dom_admins);
313 if (!NT_STATUS_IS_OK(status)) {
314 return status;
315 }
316 }
317
318 /* add root */
319 if ( (ctx = talloc_init("create_builtin_administrators")) == NULL ) {
320 return NT_STATUS_NO_MEMORY;
321 }
322 fstr_sprintf( root_name, "%s\\root", get_global_sam_name() );
323 ret = lookup_name(ctx, root_name, LOOKUP_NAME_DOMAIN, NULL, NULL,
324 &root_sid, &type);
325 TALLOC_FREE( ctx );
326
327 if ( ret ) {
328 status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
329 &root_sid);
330 }
331
332 return status;
333 }
334
335 static NTSTATUS finalize_local_nt_token(struct security_token *result,
336 bool is_guest);
337
338 NTSTATUS create_local_nt_token_from_info3(TALLOC_CTX *mem_ctx,
339 bool is_guest,
340 struct netr_SamInfo3 *info3,
341 struct extra_auth_info *extra,
342 struct security_token **ntok)
343 {
344 struct security_token *usrtok = NULL;
345 NTSTATUS status;
346 int i;
347
348 DEBUG(10, ("Create local NT token for %s\n",
349 info3->base.account_name.string));
350
351 usrtok = talloc_zero(mem_ctx, struct security_token);
352 if (!usrtok) {
353 DEBUG(0, ("talloc failed\n"));
354 return NT_STATUS_NO_MEMORY;
355 }
356
357 /* Add the user and primary group sid FIRST */
358 /* check if the user rid is the special "Domain Guests" rid.
359 * If so pick the first sid for the extra sids instead as it
360 * is a local fake account */
361 usrtok->sids = talloc_array(usrtok, struct dom_sid, 2);
362 if (!usrtok->sids) {
363 TALLOC_FREE(usrtok);
364 return NT_STATUS_NO_MEMORY;
365 }
366 usrtok->num_sids = 2;
367
368 /* USER SID */
369 if (info3->base.rid == (uint32_t)(-1)) {
370 /* this is a signal the user was fake and generated,
371 * the actual SID we want to use is stored in the extra
372 * sids */
373 if (is_null_sid(&extra->user_sid)) {
374 /* we couldn't find the user sid, bail out */
375 DEBUG(3, ("Invalid user SID\n"));
376 TALLOC_FREE(usrtok);
377 return NT_STATUS_UNSUCCESSFUL;
378 }
379 sid_copy(&usrtok->sids[0], &extra->user_sid);
380 } else {
381 sid_copy(&usrtok->sids[0], info3->base.domain_sid);
382 sid_append_rid(&usrtok->sids[0], info3->base.rid);
383 }
384
385 /* GROUP SID */
386 if (info3->base.primary_gid == (uint32_t)(-1)) {
387 /* this is a signal the user was fake and generated,
388 * the actual SID we want to use is stored in the extra
389 * sids */
390 if (is_null_sid(&extra->pgid_sid)) {
391 /* we couldn't find the user sid, bail out */
392 DEBUG(3, ("Invalid group SID\n"));
393 TALLOC_FREE(usrtok);
394 return NT_STATUS_UNSUCCESSFUL;
395 }
396 sid_copy(&usrtok->sids[1], &extra->pgid_sid);
397 } else {
398 sid_copy(&usrtok->sids[1], info3->base.domain_sid);
399 sid_append_rid(&usrtok->sids[1],
400 info3->base.primary_gid);
401 }
402
403 /* Now the SIDs we got from authentication. These are the ones from
404 * the info3 struct or from the pdb_enum_group_memberships, depending
405 * on who authenticated the user.
406 * Note that we start the for loop at "1" here, we already added the
407 * first group sid as primary above. */
408
409 for (i = 0; i < info3->base.groups.count; i++) {
410 struct dom_sid tmp_sid;
411
412 sid_copy(&tmp_sid, info3->base.domain_sid);
413 sid_append_rid(&tmp_sid, info3->base.groups.rids[i].rid);
414
415 status = add_sid_to_array_unique(usrtok, &tmp_sid,
416 &usrtok->sids,
417 &usrtok->num_sids);
418 if (!NT_STATUS_IS_OK(status)) {
419 DEBUG(3, ("Failed to add SID to nt token\n"));
420 TALLOC_FREE(usrtok);
421 return status;
422 }
423 }
424
425 /* now also add extra sids if they are not the special user/group
426 * sids */
427 for (i = 0; i < info3->sidcount; i++) {
428 status = add_sid_to_array_unique(usrtok,
429 info3->sids[i].sid,
430 &usrtok->sids,
431 &usrtok->num_sids);
432 if (!NT_STATUS_IS_OK(status)) {
433 DEBUG(3, ("Failed to add SID to nt token\n"));
434 TALLOC_FREE(usrtok);
435 return status;
436 }
437 }
438
439 status = finalize_local_nt_token(usrtok, is_guest);
440 if (!NT_STATUS_IS_OK(status)) {
441 DEBUG(3, ("Failed to finalize nt token\n"));
442 TALLOC_FREE(usrtok);
443 return status;
444 }
445
446 *ntok = usrtok;
447 return NT_STATUS_OK;
448 }
449
450 /*******************************************************************
451 Create a NT token for the user, expanding local aliases
452 *******************************************************************/
453
454 struct security_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
455 const struct dom_sid *user_sid,
456 bool is_guest,
457 int num_groupsids,
458 const struct dom_sid *groupsids)
459 {
460 struct security_token *result = NULL;
461 int i;
462 NTSTATUS status;
463
464 DEBUG(10, ("Create local NT token for %s\n",
465 sid_string_dbg(user_sid)));
466
467 if (!(result = TALLOC_ZERO_P(mem_ctx, struct security_token))) {
468 DEBUG(0, ("talloc failed\n"));
469 return NULL;
470 }
471
472 /* Add the user and primary group sid */
473
474 status = add_sid_to_array(result, user_sid,
475 &result->sids, &result->num_sids);
476 if (!NT_STATUS_IS_OK(status)) {
477 TALLOC_FREE(result);
478 return NULL;
479 }
480
481 /* For guest, num_groupsids may be zero. */
482 if (num_groupsids) {
483 status = add_sid_to_array(result, &groupsids[0],
484 &result->sids,
485 &result->num_sids);
486 if (!NT_STATUS_IS_OK(status)) {
487 TALLOC_FREE(result);
488 return NULL;
489 }
490 }
491
492 /* Now the SIDs we got from authentication. These are the ones from
493 * the info3 struct or from the pdb_enum_group_memberships, depending
494 * on who authenticated the user.
495 * Note that we start the for loop at "1" here, we already added the
496 * first group sid as primary above. */
497
498 for (i=1; i<num_groupsids; i++) {
499 status = add_sid_to_array_unique(result, &groupsids[i],
500 &result->sids,
501 &result->num_sids);
502 if (!NT_STATUS_IS_OK(status)) {
503 TALLOC_FREE(result);
504 return NULL;
505 }
506 }
507
508 status = finalize_local_nt_token(result, is_guest);
509 if (!NT_STATUS_IS_OK(status)) {
510 TALLOC_FREE(result);
511 return NULL;
512 }
513
514 return result;
515 }
516
517 static NTSTATUS finalize_local_nt_token(struct security_token *result,
518 bool is_guest)
519 {
520 struct dom_sid dom_sid;
521 gid_t gid;
522 NTSTATUS status;
523
524 /* Add in BUILTIN sids */
525
526 status = add_sid_to_array(result, &global_sid_World,
527 &result->sids, &result->num_sids);
528 if (!NT_STATUS_IS_OK(status)) {
529 return status;
530 }
531 status = add_sid_to_array(result, &global_sid_Network,
532 &result->sids, &result->num_sids);
533 if (!NT_STATUS_IS_OK(status)) {
534 return status;
535 }
536
537 if (is_guest) {
538 status = add_sid_to_array(result, &global_sid_Builtin_Guests,
539 &result->sids,
540 &result->num_sids);
541 if (!NT_STATUS_IS_OK(status)) {
542 return status;
543 }
544 } else {
545 status = add_sid_to_array(result,
546 &global_sid_Authenticated_Users,
547 &result->sids,
548 &result->num_sids);
549 if (!NT_STATUS_IS_OK(status)) {
550 return status;
551 }
552 }
553
554 /* Deal with the BUILTIN\Administrators group. If the SID can
555 be resolved then assume that the add_aliasmem( S-1-5-32 )
556 handled it. */
557
558 if (!sid_to_gid(&global_sid_Builtin_Administrators, &gid)) {
559
560 become_root();
561 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
562 status = NT_STATUS_OK;
563 DEBUG(3, ("Failed to fetch domain sid for %s\n",
564 lp_workgroup()));
565 } else {
566 status = create_builtin_administrators(&dom_sid);
567 }
568 unbecome_root();
569
570 if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) {
571 /* Add BUILTIN\Administrators directly to token. */
572 status = add_builtin_administrators(result, &dom_sid);
573 if ( !NT_STATUS_IS_OK(status) ) {
574 DEBUG(3, ("Failed to check for local "
575 "Administrators membership (%s)\n",
576 nt_errstr(status)));
577 }
578 } else if (!NT_STATUS_IS_OK(status)) {
579 DEBUG(2, ("WARNING: Failed to create "
580 "BUILTIN\\Administrators group! Can "
581 "Winbind allocate gids?\n"));
582 }
583 }
584
585 /* Deal with the BUILTIN\Users group. If the SID can
586 be resolved then assume that the add_aliasmem( S-1-5-32 )
587 handled it. */
588
589 if (!sid_to_gid(&global_sid_Builtin_Users, &gid)) {
590
591 become_root();
592 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
593 status = NT_STATUS_OK;
594 DEBUG(3, ("Failed to fetch domain sid for %s\n",
595 lp_workgroup()));
596 } else {
597 status = create_builtin_users(&dom_sid);
598 }
599 unbecome_root();
600
601 if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) &&
602 !NT_STATUS_IS_OK(status))
603 {
604 DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! "
605 "Can Winbind allocate gids?\n"));
606 }
607 }
608
609 /* Deal with local groups */
610
611 if (lp_winbind_nested_groups()) {
612
613 become_root();
614
615 /* Now add the aliases. First the one from our local SAM */
616
617 status = add_aliases(get_global_sam_sid(), result);
618
619 if (!NT_STATUS_IS_OK(status)) {
620 unbecome_root();
621 return status;
622 }
623
624 /* Finally the builtin ones */
625
626 status = add_aliases(&global_sid_Builtin, result);
627
628 if (!NT_STATUS_IS_OK(status)) {
629 unbecome_root();
630 return status;
631 }
632
633 unbecome_root();
634 }
635
636 /* Add privileges based on current user sids */
637
638 get_privileges_for_sids(&result->privilege_mask, result->sids,
639 result->num_sids);
640
641 return NT_STATUS_OK;
642 }
643
644 /****************************************************************************
645 prints a UNIX 'token' to debug output.
646 ****************************************************************************/
647
648 void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
649 int n_groups, gid_t *groups)
650 {
651 int i;
652 DEBUGC(dbg_class, dbg_lev,
653 ("UNIX token of user %ld\n", (long int)uid));
654
655 DEBUGADDC(dbg_class, dbg_lev,
656 ("Primary group is %ld and contains %i supplementary "
657 "groups\n", (long int)gid, n_groups));
658 for (i = 0; i < n_groups; i++)
659 DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
660 (long int)groups[i]));
661 }
662
663 /*
664 * Create an artificial NT token given just a username. (Initially intended
665 * for force user)
666 *
667 * We go through lookup_name() to avoid problems we had with 'winbind use
668 * default domain'.
669 *
670 * We have 3 cases:
671 *
672 * unmapped unix users: Go directly to nss to find the user's group.
673 *
674 * A passdb user: The list of groups is provided by pdb_enum_group_memberships.
675 *
676 * If the user is provided by winbind, the primary gid is set to "domain
677 * users" of the user's domain. For an explanation why this is necessary, see
678 * the thread starting at
679 * http://lists.samba.org/archive/samba-technical/2006-January/044803.html.
680 */
681
682 NTSTATUS create_token_from_username(TALLOC_CTX *mem_ctx, const char *username,
683 bool is_guest,
684 uid_t *uid, gid_t *gid,
685 char **found_username,
686 struct security_token **token)
687 {
688 NTSTATUS result = NT_STATUS_NO_SUCH_USER;
689 TALLOC_CTX *tmp_ctx = talloc_stackframe();
690 struct dom_sid user_sid;
691 enum lsa_SidType type;
692 gid_t *gids;
693 struct dom_sid *group_sids;
694 struct dom_sid unix_group_sid;
695 uint32_t num_group_sids;
696 size_t num_gids;
697 size_t i;
698
699 if (!lookup_name_smbconf(tmp_ctx, username, LOOKUP_NAME_ALL,
700 NULL, NULL, &user_sid, &type)) {
701 DEBUG(1, ("lookup_name_smbconf for %s failed\n", username));
702 goto done;
703 }
704
705 if (type != SID_NAME_USER) {
706 DEBUG(1, ("%s is a %s, not a user\n", username,
707 sid_type_lookup(type)));
708 goto done;
709 }
710
711 if (sid_check_is_in_our_domain(&user_sid)) {
712 bool ret;
713 size_t pdb_num_group_sids;
714 /* This is a passdb user, so ask passdb */
715
716 struct samu *sam_acct = NULL;
717
718 if ( !(sam_acct = samu_new( tmp_ctx )) ) {
719 result = NT_STATUS_NO_MEMORY;
720 goto done;
721 }
722
723 become_root();
724 ret = pdb_getsampwsid(sam_acct, &user_sid);
725 unbecome_root();
726
727 if (!ret) {
728 DEBUG(1, ("pdb_getsampwsid(%s) for user %s failed\n",
729 sid_string_dbg(&user_sid), username));
730 DEBUGADD(1, ("Fall back to unix user %s\n", username));
731 goto unix_user;
732 }
733
734 result = pdb_enum_group_memberships(tmp_ctx, sam_acct,
735 &group_sids, &gids,
736 &pdb_num_group_sids);
737 if (!NT_STATUS_IS_OK(result)) {
738 DEBUG(1, ("enum_group_memberships failed for %s (%s): "
739 "%s\n", username, sid_string_dbg(&user_sid),
740 nt_errstr(result)));
741 DEBUGADD(1, ("Fall back to unix user %s\n", username));
742 goto unix_user;
743 }
744 num_group_sids = pdb_num_group_sids;
745
746 /* see the smb_panic() in pdb_default_enum_group_memberships */
747 SMB_ASSERT(num_group_sids > 0);
748
749 *gid = gids[0];
750
751 /* Ensure we're returning the found_username on the right context. */
752 *found_username = talloc_strdup(mem_ctx,
753 pdb_get_username(sam_acct));
754
755 /*
756 * If the SID from lookup_name() was the guest sid, passdb knows
757 * about the mapping of guest sid to lp_guestaccount()
758 * username and will return the unix_pw info for a guest
759 * user. Use it if it's there, else lookup the *uid details
760 * using Get_Pwnam_alloc(). See bug #6291 for details. JRA.
761 */
762
763 /* We must always assign the *uid. */
764 if (sam_acct->unix_pw == NULL) {
765 struct passwd *pwd = Get_Pwnam_alloc(sam_acct, *found_username );
766 if (!pwd) {
767 DEBUG(10, ("Get_Pwnam_alloc failed for %s\n",
768 *found_username));
769 result = NT_STATUS_NO_SUCH_USER;
770 goto done;
771 }
772 result = samu_set_unix(sam_acct, pwd );
773 if (!NT_STATUS_IS_OK(result)) {
774 DEBUG(10, ("samu_set_unix failed for %s\n",
775 *found_username));
776 result = NT_STATUS_NO_SUCH_USER;
777 goto done;
778 }
779 }
780 *uid = sam_acct->unix_pw->pw_uid;
781
782 } else if (sid_check_is_in_unix_users(&user_sid)) {
783 size_t getgroups_num_group_sids;
784 /* This is a unix user not in passdb. We need to ask nss
785 * directly, without consulting passdb */
786
787 struct passwd *pass;
788
789 /*
790 * This goto target is used as a fallback for the passdb
791 * case. The concrete bug report is when passdb gave us an
792 * unmapped gid.
793 */
794
795 unix_user:
796
797 if (!sid_to_uid(&user_sid, uid)) {
798 DEBUG(1, ("unix_user case, sid_to_uid for %s (%s) failed\n",
799 username, sid_string_dbg(&user_sid)));
800 result = NT_STATUS_NO_SUCH_USER;
801 goto done;
802 }
803
804 uid_to_unix_users_sid(*uid, &user_sid);
805
806 pass = getpwuid_alloc(tmp_ctx, *uid);
807 if (pass == NULL) {
808 DEBUG(1, ("getpwuid(%u) for user %s failed\n",
809 (unsigned int)*uid, username));
810 goto done;
811 }
812
813 if (!getgroups_unix_user(tmp_ctx, username, pass->pw_gid,
814 &gids, &getgroups_num_group_sids)) {
815 DEBUG(1, ("getgroups_unix_user for user %s failed\n",
816 username));
817 goto done;
818 }
819 num_group_sids = getgroups_num_group_sids;
820
821 if (num_group_sids) {
822 group_sids = TALLOC_ARRAY(tmp_ctx, struct dom_sid, num_group_sids);
823 if (group_sids == NULL) {
824 DEBUG(1, ("TALLOC_ARRAY failed\n"));
825 result = NT_STATUS_NO_MEMORY;
826 goto done;
827 }
828 } else {
829 group_sids = NULL;
830 }
831
832 for (i=0; i<num_group_sids; i++) {
833 gid_to_sid(&group_sids[i], gids[i]);
834 }
835
836 /* In getgroups_unix_user we always set the primary gid */
837 SMB_ASSERT(num_group_sids > 0);
838
839 *gid = gids[0];
840
841 /* Ensure we're returning the found_username on the right context. */
842 *found_username = talloc_strdup(mem_ctx, pass->pw_name);
843 } else {
844
845 /* This user is from winbind, force the primary gid to the
846 * user's "domain users" group. Under certain circumstances
847 * (user comes from NT4), this might be a loss of
848 * information. But we can not rely on winbind getting the
849 * correct info. AD might prohibit winbind looking up that
850 * information. */
851
852 uint32 dummy;
853
854 /* We must always assign the *uid. */
855 if (!sid_to_uid(&user_sid, uid)) {
856 DEBUG(1, ("winbindd case, sid_to_uid for %s (%s) failed\n",
857 username, sid_string_dbg(&user_sid)));
858 result = NT_STATUS_NO_SUCH_USER;
859 goto done;
860 }
861
862 num_group_sids = 1;
863 group_sids = TALLOC_ARRAY(tmp_ctx, struct dom_sid, num_group_sids);
864 if (group_sids == NULL) {
865 DEBUG(1, ("TALLOC_ARRAY failed\n"));
866 result = NT_STATUS_NO_MEMORY;
867 goto done;
868 }
869
870 sid_copy(&group_sids[0], &user_sid);
871 sid_split_rid(&group_sids[0], &dummy);
872 sid_append_rid(&group_sids[0], DOMAIN_RID_USERS);
873
874 if (!sid_to_gid(&group_sids[0], gid)) {
875 DEBUG(1, ("sid_to_gid(%s) failed\n",
876 sid_string_dbg(&group_sids[0])));
877 goto done;
878 }
879
880 gids = gid;
881
882 /* Ensure we're returning the found_username on the right context. */
883 *found_username = talloc_strdup(mem_ctx, username);
884 }
885
886 /* Add the "Unix Group" SID for each gid to catch mapped groups
887 and their Unix equivalent. This is to solve the backwards
888 compatibility problem of 'valid users = +ntadmin' where
889 ntadmin has been paired with "Domain Admins" in the group
890 mapping table. Otherwise smb.conf would need to be changed
891 to 'valid user = "Domain Admins"'. --jerry */
892
893 num_gids = num_group_sids;
894 for ( i=0; i<num_gids; i++ ) {
895 gid_t high, low;
896
897 /* don't pickup anything managed by Winbind */
898
899 if ( lp_idmap_gid(&low, &high) && (gids[i] >= low) && (gids[i] <= high) )
900 continue;
901
902 gid_to_unix_groups_sid(gids[i], &unix_group_sid);
903
904 result = add_sid_to_array_unique(tmp_ctx, &unix_group_sid,
905 &group_sids, &num_group_sids);
906 if (!NT_STATUS_IS_OK(result)) {
907 goto done;
908 }
909 }
910
911 /* Ensure we're creating the nt_token on the right context. */
912 *token = create_local_nt_token(mem_ctx, &user_sid,
913 is_guest, num_group_sids, group_sids);
914
915 if ((*token == NULL) || (*found_username == NULL)) {
916 result = NT_STATUS_NO_MEMORY;
917 goto done;
918 }
919
920 result = NT_STATUS_OK;
921 done:
922 TALLOC_FREE(tmp_ctx);
923 return result;
924 }
925
926 /***************************************************************************
927 Build upon create_token_from_username:
928
929 Expensive helper function to figure out whether a user given its name is
930 member of a particular group.
931 ***************************************************************************/
932
933 bool user_in_group_sid(const char *username, const struct dom_sid *group_sid)
934 {
935 NTSTATUS status;
936 uid_t uid;
937 gid_t gid;
938 char *found_username;
939 struct security_token *token;
940 bool result;
941 TALLOC_CTX *mem_ctx = talloc_stackframe();
942
943 status = create_token_from_username(mem_ctx, username, False,
944 &uid, &gid, &found_username,
945 &token);
946
947 if (!NT_STATUS_IS_OK(status)) {
948 DEBUG(10, ("could not create token for %s\n", username));
949 TALLOC_FREE(mem_ctx);
950 return False;
951 }
952
953 result = security_token_has_sid(token, group_sid);
954
955 TALLOC_FREE(mem_ctx);
956 return result;
957 }
958
959 bool user_in_group(const char *username, const char *groupname)
960 {
961 TALLOC_CTX *mem_ctx = talloc_stackframe();
962 struct dom_sid group_sid;
963 bool ret;
964
965 ret = lookup_name(mem_ctx, groupname, LOOKUP_NAME_ALL,
966 NULL, NULL, &group_sid, NULL);
967 TALLOC_FREE(mem_ctx);
968
969 if (!ret) {
970 DEBUG(10, ("lookup_name for (%s) failed.\n", groupname));
971 return False;
972 }
973
974 return user_in_group_sid(username, &group_sid);
975 }
976
977 /* END */
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