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lib/util: usec_time_diff takes arguments the other way round than TvalDiff did
[Samba.git] / source3 / auth / token_util.c
blobbc7d998341138b484bc6166daacb9045ce11683f
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
31 #include "../librpc/gen_ndr/netlogon.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 int i;
40
41 if ( !sid || !token )
42 return False;
43
44 for ( i=0; i<token->num_sids; i++ ) {
45 if ( sid_equal( sid, &token->sids[i] ) )
46 return True;
47 }
48
49 return False;
50 }
51
52 bool nt_token_check_domain_rid( struct security_token *token, uint32 rid )
53 {
54 struct dom_sid domain_sid;
55
56 /* if we are a domain member, the get the domain SID, else for
57 a DC or standalone server, use our own SID */
58
59 if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
60 if ( !secrets_fetch_domain_sid( lp_workgroup(),
61 &domain_sid ) ) {
62 DEBUG(1,("nt_token_check_domain_rid: Cannot lookup "
63 "SID for domain [%s]\n", lp_workgroup()));
64 return False;
65 }
66 }
67 else
68 sid_copy( &domain_sid, get_global_sam_sid() );
69
70 sid_append_rid( &domain_sid, rid );
71
72 return nt_token_check_sid( &domain_sid, token );\
73 }
74
75 /******************************************************************************
76 Create a token for the root user to be used internally by smbd.
77 This is similar to running under the context of the LOCAL_SYSTEM account
78 in Windows. This is a read-only token. Do not modify it or free() it.
79 Create a copy if your need to change it.
80 ******************************************************************************/
81
82 struct security_token *get_root_nt_token( void )
83 {
84 struct security_token *token, *for_cache;
85 struct dom_sid u_sid, g_sid;
86 struct passwd *pw;
87 void *cache_data;
88
89 cache_data = memcache_lookup_talloc(
90 NULL, SINGLETON_CACHE_TALLOC,
91 data_blob_string_const_null("root_nt_token"));
92
93 if (cache_data != NULL) {
94 return talloc_get_type_abort(
95 cache_data, struct security_token);
96 }
97
98 if ( !(pw = sys_getpwuid(0)) ) {
99 if ( !(pw = sys_getpwnam("root")) ) {
100 DEBUG(0,("get_root_nt_token: both sys_getpwuid(0) "
101 "and sys_getpwnam(\"root\") failed!\n"));
102 return NULL;
103 }
104 }
105
106 /* get the user and primary group SIDs; although the
107 BUILTIN\Administrators SId is really the one that matters here */
108
109 uid_to_sid(&u_sid, pw->pw_uid);
110 gid_to_sid(&g_sid, pw->pw_gid);
111
112 token = create_local_nt_token(talloc_autofree_context(), &u_sid, False,
113 1, &global_sid_Builtin_Administrators);
114
115 security_token_set_privilege(token, SEC_PRIV_DISK_OPERATOR);
116
117 for_cache = token;
118
119 memcache_add_talloc(
120 NULL, SINGLETON_CACHE_TALLOC,
121 data_blob_string_const_null("root_nt_token"), &for_cache);
122
123 return token;
124 }
125
126
127 /*
128 * Add alias SIDs from memberships within the partially created token SID list
129 */
130
131 NTSTATUS add_aliases(const struct dom_sid *domain_sid,
132 struct security_token *token)
133 {
134 uint32 *aliases;
135 size_t i, num_aliases;
136 NTSTATUS status;
137 TALLOC_CTX *tmp_ctx;
138
139 if (!(tmp_ctx = talloc_init("add_aliases"))) {
140 return NT_STATUS_NO_MEMORY;
141 }
142
143 aliases = NULL;
144 num_aliases = 0;
145
146 status = pdb_enum_alias_memberships(tmp_ctx, domain_sid,
147 token->sids,
148 token->num_sids,
149 &aliases, &num_aliases);
150
151 if (!NT_STATUS_IS_OK(status)) {
152 DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n",
153 nt_errstr(status)));
154 goto done;
155 }
156
157 for (i=0; i<num_aliases; i++) {
158 struct dom_sid alias_sid;
159 sid_compose(&alias_sid, domain_sid, aliases[i]);
160 status = add_sid_to_array_unique(token, &alias_sid,
161 &token->sids,
162 &token->num_sids);
163 if (!NT_STATUS_IS_OK(status)) {
164 DEBUG(0, ("add_sid_to_array failed\n"));
165 goto done;
166 }
167 }
168
169 done:
170 TALLOC_FREE(tmp_ctx);
171 return NT_STATUS_OK;
172 }
173
174 /*******************************************************************
175 *******************************************************************/
176
177 static NTSTATUS add_builtin_administrators(struct security_token *token,
178 const struct dom_sid *dom_sid)
179 {
180 struct dom_sid domadm;
181 NTSTATUS status;
182
183 /* nothing to do if we aren't in a domain */
184
185 if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) {
186 return NT_STATUS_OK;
187 }
188
189 /* Find the Domain Admins SID */
190
191 if ( IS_DC ) {
192 sid_copy( &domadm, get_global_sam_sid() );
193 } else {
194 sid_copy(&domadm, dom_sid);
195 }
196 sid_append_rid( &domadm, DOMAIN_RID_ADMINS );
197
198 /* Add Administrators if the user beloongs to Domain Admins */
199
200 if ( nt_token_check_sid( &domadm, token ) ) {
201 status = add_sid_to_array(token,
202 &global_sid_Builtin_Administrators,
203 &token->sids, &token->num_sids);
204 if (!NT_STATUS_IS_OK(status)) {
205 return status;
206 }
207 }
208
209 return NT_STATUS_OK;
210 }
211
212 /**
213 * Create the requested BUILTIN if it doesn't already exist. This requires
214 * winbindd to be running.
215 *
216 * @param[in] rid BUILTIN rid to create
217 * @return Normal NTSTATUS return.
218 */
219 static NTSTATUS create_builtin(uint32 rid)
220 {
221 NTSTATUS status = NT_STATUS_OK;
222 struct dom_sid sid;
223 gid_t gid;
224
225 if (!sid_compose(&sid, &global_sid_Builtin, rid)) {
226 return NT_STATUS_NO_SUCH_ALIAS;
227 }
228
229 if (!sid_to_gid(&sid, &gid)) {
230 if (!lp_winbind_nested_groups() || !winbind_ping()) {
231 return NT_STATUS_PROTOCOL_UNREACHABLE;
232 }
233 status = pdb_create_builtin_alias(rid);
234 }
235 return status;
236 }
237
238 /**
239 * Add sid as a member of builtin_sid.
240 *
241 * @param[in] builtin_sid An existing builtin group.
242 * @param[in] dom_sid sid to add as a member of builtin_sid.
243 * @return Normal NTSTATUS return
244 */
245 static NTSTATUS add_sid_to_builtin(const struct dom_sid *builtin_sid,
246 const struct dom_sid *dom_sid)
247 {
248 NTSTATUS status = NT_STATUS_OK;
249
250 if (!dom_sid || !builtin_sid) {
251 return NT_STATUS_INVALID_PARAMETER;
252 }
253
254 status = pdb_add_aliasmem(builtin_sid, dom_sid);
255
256 if (NT_STATUS_EQUAL(status, NT_STATUS_MEMBER_IN_ALIAS)) {
257 DEBUG(5, ("add_sid_to_builtin %s is already a member of %s\n",
258 sid_string_dbg(dom_sid),
259 sid_string_dbg(builtin_sid)));
260 return NT_STATUS_OK;
261 }
262
263 if (!NT_STATUS_IS_OK(status)) {
264 DEBUG(4, ("add_sid_to_builtin %s could not be added to %s: "
265 "%s\n", sid_string_dbg(dom_sid),
266 sid_string_dbg(builtin_sid), nt_errstr(status)));
267 }
268 return status;
269 }
270
271 /*******************************************************************
272 *******************************************************************/
273
274 NTSTATUS create_builtin_users(const struct dom_sid *dom_sid)
275 {
276 NTSTATUS status;
277 struct dom_sid dom_users;
278
279 status = create_builtin(BUILTIN_RID_USERS);
280 if ( !NT_STATUS_IS_OK(status) ) {
281 DEBUG(5,("create_builtin_users: Failed to create Users\n"));
282 return status;
283 }
284
285 /* add domain users */
286 if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
287 && sid_compose(&dom_users, dom_sid, DOMAIN_RID_USERS))
288 {
289 status = add_sid_to_builtin(&global_sid_Builtin_Users,
290 &dom_users);
291 }
292
293 return status;
294 }
295
296 /*******************************************************************
297 *******************************************************************/
298
299 NTSTATUS create_builtin_administrators(const struct dom_sid *dom_sid)
300 {
301 NTSTATUS status;
302 struct dom_sid dom_admins, root_sid;
303 fstring root_name;
304 enum lsa_SidType type;
305 TALLOC_CTX *ctx;
306 bool ret;
307
308 status = create_builtin(BUILTIN_RID_ADMINISTRATORS);
309 if ( !NT_STATUS_IS_OK(status) ) {
310 DEBUG(5,("create_builtin_administrators: Failed to create Administrators\n"));
311 return status;
312 }
313
314 /* add domain admins */
315 if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
316 && sid_compose(&dom_admins, dom_sid, DOMAIN_RID_ADMINS))
317 {
318 status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
319 &dom_admins);
320 if (!NT_STATUS_IS_OK(status)) {
321 return status;
322 }
323 }
324
325 /* add root */
326 if ( (ctx = talloc_init("create_builtin_administrators")) == NULL ) {
327 return NT_STATUS_NO_MEMORY;
328 }
329 fstr_sprintf( root_name, "%s\\root", get_global_sam_name() );
330 ret = lookup_name(ctx, root_name, LOOKUP_NAME_DOMAIN, NULL, NULL,
331 &root_sid, &type);
332 TALLOC_FREE( ctx );
333
334 if ( ret ) {
335 status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
336 &root_sid);
337 }
338
339 return status;
340 }
341
342 static NTSTATUS finalize_local_nt_token(struct security_token *result,
343 bool is_guest);
344
345 NTSTATUS create_local_nt_token_from_info3(TALLOC_CTX *mem_ctx,
346 bool is_guest,
347 struct netr_SamInfo3 *info3,
348 struct extra_auth_info *extra,
349 struct security_token **ntok)
350 {
351 struct security_token *usrtok = NULL;
352 NTSTATUS status;
353 int i;
354
355 DEBUG(10, ("Create local NT token for %s\n",
356 info3->base.account_name.string));
357
358 usrtok = talloc_zero(mem_ctx, struct security_token);
359 if (!usrtok) {
360 DEBUG(0, ("talloc failed\n"));
361 return NT_STATUS_NO_MEMORY;
362 }
363
364 /* Add the user and primary group sid FIRST */
365 /* check if the user rid is the special "Domain Guests" rid.
366 * If so pick the first sid for the extra sids instead as it
367 * is a local fake account */
368 usrtok->sids = talloc_array(usrtok, struct dom_sid, 2);
369 if (!usrtok->sids) {
370 TALLOC_FREE(usrtok);
371 return NT_STATUS_NO_MEMORY;
372 }
373 usrtok->num_sids = 2;
374
375 /* USER SID */
376 if (info3->base.rid == (uint32_t)(-1)) {
377 /* this is a signal the user was fake and generated,
378 * the actual SID we want to use is stored in the extra
379 * sids */
380 if (is_null_sid(&extra->user_sid)) {
381 /* we couldn't find the user sid, bail out */
382 DEBUG(3, ("Invalid user SID\n"));
383 TALLOC_FREE(usrtok);
384 return NT_STATUS_UNSUCCESSFUL;
385 }
386 sid_copy(&usrtok->sids[0], &extra->user_sid);
387 } else {
388 sid_copy(&usrtok->sids[0], info3->base.domain_sid);
389 sid_append_rid(&usrtok->sids[0], info3->base.rid);
390 }
391
392 /* GROUP SID */
393 if (info3->base.primary_gid == (uint32_t)(-1)) {
394 /* this is a signal the user was fake and generated,
395 * the actual SID we want to use is stored in the extra
396 * sids */
397 if (is_null_sid(&extra->pgid_sid)) {
398 /* we couldn't find the user sid, bail out */
399 DEBUG(3, ("Invalid group SID\n"));
400 TALLOC_FREE(usrtok);
401 return NT_STATUS_UNSUCCESSFUL;
402 }
403 sid_copy(&usrtok->sids[1], &extra->pgid_sid);
404 } else {
405 sid_copy(&usrtok->sids[1], info3->base.domain_sid);
406 sid_append_rid(&usrtok->sids[1],
407 info3->base.primary_gid);
408 }
409
410 /* Now the SIDs we got from authentication. These are the ones from
411 * the info3 struct or from the pdb_enum_group_memberships, depending
412 * on who authenticated the user.
413 * Note that we start the for loop at "1" here, we already added the
414 * first group sid as primary above. */
415
416 for (i = 0; i < info3->base.groups.count; i++) {
417 struct dom_sid tmp_sid;
418
419 sid_copy(&tmp_sid, info3->base.domain_sid);
420 sid_append_rid(&tmp_sid, info3->base.groups.rids[i].rid);
421
422 status = add_sid_to_array_unique(usrtok, &tmp_sid,
423 &usrtok->sids,
424 &usrtok->num_sids);
425 if (!NT_STATUS_IS_OK(status)) {
426 DEBUG(3, ("Failed to add SID to nt token\n"));
427 TALLOC_FREE(usrtok);
428 return status;
429 }
430 }
431
432 /* now also add extra sids if they are not the special user/group
433 * sids */
434 for (i = 0; i < info3->sidcount; i++) {
435 status = add_sid_to_array_unique(usrtok,
436 info3->sids[i].sid,
437 &usrtok->sids,
438 &usrtok->num_sids);
439 if (!NT_STATUS_IS_OK(status)) {
440 DEBUG(3, ("Failed to add SID to nt token\n"));
441 TALLOC_FREE(usrtok);
442 return status;
443 }
444 }
445
446 status = finalize_local_nt_token(usrtok, is_guest);
447 if (!NT_STATUS_IS_OK(status)) {
448 DEBUG(3, ("Failed to finalize nt token\n"));
449 TALLOC_FREE(usrtok);
450 return status;
451 }
452
453 *ntok = usrtok;
454 return NT_STATUS_OK;
455 }
456
457 /*******************************************************************
458 Create a NT token for the user, expanding local aliases
459 *******************************************************************/
460
461 struct security_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
462 const struct dom_sid *user_sid,
463 bool is_guest,
464 int num_groupsids,
465 const struct dom_sid *groupsids)
466 {
467 struct security_token *result = NULL;
468 int i;
469 NTSTATUS status;
470
471 DEBUG(10, ("Create local NT token for %s\n",
472 sid_string_dbg(user_sid)));
473
474 if (!(result = TALLOC_ZERO_P(mem_ctx, struct security_token))) {
475 DEBUG(0, ("talloc failed\n"));
476 return NULL;
477 }
478
479 /* Add the user and primary group sid */
480
481 status = add_sid_to_array(result, user_sid,
482 &result->sids, &result->num_sids);
483 if (!NT_STATUS_IS_OK(status)) {
484 TALLOC_FREE(result);
485 return NULL;
486 }
487
488 /* For guest, num_groupsids may be zero. */
489 if (num_groupsids) {
490 status = add_sid_to_array(result, &groupsids[0],
491 &result->sids,
492 &result->num_sids);
493 if (!NT_STATUS_IS_OK(status)) {
494 TALLOC_FREE(result);
495 return NULL;
496 }
497 }
498
499 /* Now the SIDs we got from authentication. These are the ones from
500 * the info3 struct or from the pdb_enum_group_memberships, depending
501 * on who authenticated the user.
502 * Note that we start the for loop at "1" here, we already added the
503 * first group sid as primary above. */
504
505 for (i=1; i<num_groupsids; i++) {
506 status = add_sid_to_array_unique(result, &groupsids[i],
507 &result->sids,
508 &result->num_sids);
509 if (!NT_STATUS_IS_OK(status)) {
510 TALLOC_FREE(result);
511 return NULL;
512 }
513 }
514
515 status = finalize_local_nt_token(result, is_guest);
516 if (!NT_STATUS_IS_OK(status)) {
517 TALLOC_FREE(result);
518 return NULL;
519 }
520
521 return result;
522 }
523
524 static NTSTATUS finalize_local_nt_token(struct security_token *result,
525 bool is_guest)
526 {
527 struct dom_sid dom_sid;
528 gid_t gid;
529 NTSTATUS status;
530
531 /* Add in BUILTIN sids */
532
533 status = add_sid_to_array(result, &global_sid_World,
534 &result->sids, &result->num_sids);
535 if (!NT_STATUS_IS_OK(status)) {
536 return status;
537 }
538 status = add_sid_to_array(result, &global_sid_Network,
539 &result->sids, &result->num_sids);
540 if (!NT_STATUS_IS_OK(status)) {
541 return status;
542 }
543
544 if (is_guest) {
545 status = add_sid_to_array(result, &global_sid_Builtin_Guests,
546 &result->sids,
547 &result->num_sids);
548 if (!NT_STATUS_IS_OK(status)) {
549 return status;
550 }
551 } else {
552 status = add_sid_to_array(result,
553 &global_sid_Authenticated_Users,
554 &result->sids,
555 &result->num_sids);
556 if (!NT_STATUS_IS_OK(status)) {
557 return status;
558 }
559 }
560
561 /* Deal with the BUILTIN\Administrators group. If the SID can
562 be resolved then assume that the add_aliasmem( S-1-5-32 )
563 handled it. */
564
565 if (!sid_to_gid(&global_sid_Builtin_Administrators, &gid)) {
566
567 become_root();
568 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
569 status = NT_STATUS_OK;
570 DEBUG(3, ("Failed to fetch domain sid for %s\n",
571 lp_workgroup()));
572 } else {
573 status = create_builtin_administrators(&dom_sid);
574 }
575 unbecome_root();
576
577 if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) {
578 /* Add BUILTIN\Administrators directly to token. */
579 status = add_builtin_administrators(result, &dom_sid);
580 if ( !NT_STATUS_IS_OK(status) ) {
581 DEBUG(3, ("Failed to check for local "
582 "Administrators membership (%s)\n",
583 nt_errstr(status)));
584 }
585 } else if (!NT_STATUS_IS_OK(status)) {
586 DEBUG(2, ("WARNING: Failed to create "
587 "BUILTIN\\Administrators group! Can "
588 "Winbind allocate gids?\n"));
589 }
590 }
591
592 /* Deal with the BUILTIN\Users group. If the SID can
593 be resolved then assume that the add_aliasmem( S-1-5-32 )
594 handled it. */
595
596 if (!sid_to_gid(&global_sid_Builtin_Users, &gid)) {
597
598 become_root();
599 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
600 status = NT_STATUS_OK;
601 DEBUG(3, ("Failed to fetch domain sid for %s\n",
602 lp_workgroup()));
603 } else {
604 status = create_builtin_users(&dom_sid);
605 }
606 unbecome_root();
607
608 if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) &&
609 !NT_STATUS_IS_OK(status))
610 {
611 DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! "
612 "Can Winbind allocate gids?\n"));
613 }
614 }
615
616 /* Deal with local groups */
617
618 if (lp_winbind_nested_groups()) {
619
620 become_root();
621
622 /* Now add the aliases. First the one from our local SAM */
623
624 status = add_aliases(get_global_sam_sid(), result);
625
626 if (!NT_STATUS_IS_OK(status)) {
627 unbecome_root();
628 return status;
629 }
630
631 /* Finally the builtin ones */
632
633 status = add_aliases(&global_sid_Builtin, result);
634
635 if (!NT_STATUS_IS_OK(status)) {
636 unbecome_root();
637 return status;
638 }
639
640 unbecome_root();
641 }
642
643 /* Add privileges based on current user sids */
644
645 get_privileges_for_sids(&result->privilege_mask, result->sids,
646 result->num_sids);
647
648 return NT_STATUS_OK;
649 }
650
651 /****************************************************************************
652 prints a struct security_token to debug output.
653 ****************************************************************************/
654
655 void debug_nt_user_token(int dbg_class, int dbg_lev, struct security_token *token)
656 {
657 size_t i;
658
659 if (!token) {
660 DEBUGC(dbg_class, dbg_lev, ("NT user token: (NULL)\n"));
661 return;
662 }
663
664 DEBUGC(dbg_class, dbg_lev,
665 ("NT user token of user %s\n",
666 sid_string_dbg(&token->sids[0]) ));
667 DEBUGADDC(dbg_class, dbg_lev,
668 ("contains %lu SIDs\n", (unsigned long)token->num_sids));
669 for (i = 0; i < token->num_sids; i++)
670 DEBUGADDC(dbg_class, dbg_lev,
671 ("SID[%3lu]: %s\n", (unsigned long)i,
672 sid_string_dbg(&token->sids[i])));
673
674 DEBUGADDC(dbg_class, dbg_lev,("Privilege mask: 0x%llx\n", (unsigned long long)token->privilege_mask));
675 }
676
677 /****************************************************************************
678 prints a UNIX 'token' to debug output.
679 ****************************************************************************/
680
681 void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
682 int n_groups, gid_t *groups)
683 {
684 int i;
685 DEBUGC(dbg_class, dbg_lev,
686 ("UNIX token of user %ld\n", (long int)uid));
687
688 DEBUGADDC(dbg_class, dbg_lev,
689 ("Primary group is %ld and contains %i supplementary "
690 "groups\n", (long int)gid, n_groups));
691 for (i = 0; i < n_groups; i++)
692 DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
693 (long int)groups[i]));
694 }
695
696 /*
697 * Create an artificial NT token given just a username. (Initially intended
698 * for force user)
699 *
700 * We go through lookup_name() to avoid problems we had with 'winbind use
701 * default domain'.
702 *
703 * We have 3 cases:
704 *
705 * unmapped unix users: Go directly to nss to find the user's group.
706 *
707 * A passdb user: The list of groups is provided by pdb_enum_group_memberships.
708 *
709 * If the user is provided by winbind, the primary gid is set to "domain
710 * users" of the user's domain. For an explanation why this is necessary, see
711 * the thread starting at
712 * http://lists.samba.org/archive/samba-technical/2006-January/044803.html.
713 */
714
715 NTSTATUS create_token_from_username(TALLOC_CTX *mem_ctx, const char *username,
716 bool is_guest,
717 uid_t *uid, gid_t *gid,
718 char **found_username,
719 struct security_token **token)
720 {
721 NTSTATUS result = NT_STATUS_NO_SUCH_USER;
722 TALLOC_CTX *tmp_ctx = talloc_stackframe();
723 struct dom_sid user_sid;
724 enum lsa_SidType type;
725 gid_t *gids;
726 struct dom_sid *group_sids;
727 struct dom_sid unix_group_sid;
728 uint32_t num_group_sids;
729 size_t num_gids;
730 size_t i;
731
732 if (!lookup_name_smbconf(tmp_ctx, username, LOOKUP_NAME_ALL,
733 NULL, NULL, &user_sid, &type)) {
734 DEBUG(1, ("lookup_name_smbconf for %s failed\n", username));
735 goto done;
736 }
737
738 if (type != SID_NAME_USER) {
739 DEBUG(1, ("%s is a %s, not a user\n", username,
740 sid_type_lookup(type)));
741 goto done;
742 }
743
744 if (sid_check_is_in_our_domain(&user_sid)) {
745 bool ret;
746 size_t pdb_num_group_sids;
747 /* This is a passdb user, so ask passdb */
748
749 struct samu *sam_acct = NULL;
750
751 if ( !(sam_acct = samu_new( tmp_ctx )) ) {
752 result = NT_STATUS_NO_MEMORY;
753 goto done;
754 }
755
756 become_root();
757 ret = pdb_getsampwsid(sam_acct, &user_sid);
758 unbecome_root();
759
760 if (!ret) {
761 DEBUG(1, ("pdb_getsampwsid(%s) for user %s failed\n",
762 sid_string_dbg(&user_sid), username));
763 DEBUGADD(1, ("Fall back to unix user %s\n", username));
764 goto unix_user;
765 }
766
767 result = pdb_enum_group_memberships(tmp_ctx, sam_acct,
768 &group_sids, &gids,
769 &pdb_num_group_sids);
770 if (!NT_STATUS_IS_OK(result)) {
771 DEBUG(1, ("enum_group_memberships failed for %s (%s): "
772 "%s\n", username, sid_string_dbg(&user_sid),
773 nt_errstr(result)));
774 DEBUGADD(1, ("Fall back to unix user %s\n", username));
775 goto unix_user;
776 }
777 num_group_sids = pdb_num_group_sids;
778
779 /* see the smb_panic() in pdb_default_enum_group_memberships */
780 SMB_ASSERT(num_group_sids > 0);
781
782 *gid = gids[0];
783
784 /* Ensure we're returning the found_username on the right context. */
785 *found_username = talloc_strdup(mem_ctx,
786 pdb_get_username(sam_acct));
787
788 /*
789 * If the SID from lookup_name() was the guest sid, passdb knows
790 * about the mapping of guest sid to lp_guestaccount()
791 * username and will return the unix_pw info for a guest
792 * user. Use it if it's there, else lookup the *uid details
793 * using getpwnam_alloc(). See bug #6291 for details. JRA.
794 */
795
796 /* We must always assign the *uid. */
797 if (sam_acct->unix_pw == NULL) {
798 struct passwd *pwd = getpwnam_alloc(sam_acct, *found_username );
799 if (!pwd) {
800 DEBUG(10, ("getpwnam_alloc failed for %s\n",
801 *found_username));
802 result = NT_STATUS_NO_SUCH_USER;
803 goto done;
804 }
805 result = samu_set_unix(sam_acct, pwd );
806 if (!NT_STATUS_IS_OK(result)) {
807 DEBUG(10, ("samu_set_unix failed for %s\n",
808 *found_username));
809 result = NT_STATUS_NO_SUCH_USER;
810 goto done;
811 }
812 }
813 *uid = sam_acct->unix_pw->pw_uid;
814
815 } else if (sid_check_is_in_unix_users(&user_sid)) {
816 size_t getgroups_num_group_sids;
817 /* This is a unix user not in passdb. We need to ask nss
818 * directly, without consulting passdb */
819
820 struct passwd *pass;
821
822 /*
823 * This goto target is used as a fallback for the passdb
824 * case. The concrete bug report is when passdb gave us an
825 * unmapped gid.
826 */
827
828 unix_user:
829
830 if (!sid_to_uid(&user_sid, uid)) {
831 DEBUG(1, ("unix_user case, sid_to_uid for %s (%s) failed\n",
832 username, sid_string_dbg(&user_sid)));
833 result = NT_STATUS_NO_SUCH_USER;
834 goto done;
835 }
836
837 uid_to_unix_users_sid(*uid, &user_sid);
838
839 pass = getpwuid_alloc(tmp_ctx, *uid);
840 if (pass == NULL) {
841 DEBUG(1, ("getpwuid(%u) for user %s failed\n",
842 (unsigned int)*uid, username));
843 goto done;
844 }
845
846 if (!getgroups_unix_user(tmp_ctx, username, pass->pw_gid,
847 &gids, &getgroups_num_group_sids)) {
848 DEBUG(1, ("getgroups_unix_user for user %s failed\n",
849 username));
850 goto done;
851 }
852 num_group_sids = getgroups_num_group_sids;
853
854 if (num_group_sids) {
855 group_sids = TALLOC_ARRAY(tmp_ctx, struct dom_sid, num_group_sids);
856 if (group_sids == NULL) {
857 DEBUG(1, ("TALLOC_ARRAY failed\n"));
858 result = NT_STATUS_NO_MEMORY;
859 goto done;
860 }
861 } else {
862 group_sids = NULL;
863 }
864
865 for (i=0; i<num_group_sids; i++) {
866 gid_to_sid(&group_sids[i], gids[i]);
867 }
868
869 /* In getgroups_unix_user we always set the primary gid */
870 SMB_ASSERT(num_group_sids > 0);
871
872 *gid = gids[0];
873
874 /* Ensure we're returning the found_username on the right context. */
875 *found_username = talloc_strdup(mem_ctx, pass->pw_name);
876 } else {
877
878 /* This user is from winbind, force the primary gid to the
879 * user's "domain users" group. Under certain circumstances
880 * (user comes from NT4), this might be a loss of
881 * information. But we can not rely on winbind getting the
882 * correct info. AD might prohibit winbind looking up that
883 * information. */
884
885 uint32 dummy;
886
887 /* We must always assign the *uid. */
888 if (!sid_to_uid(&user_sid, uid)) {
889 DEBUG(1, ("winbindd case, sid_to_uid for %s (%s) failed\n",
890 username, sid_string_dbg(&user_sid)));
891 result = NT_STATUS_NO_SUCH_USER;
892 goto done;
893 }
894
895 num_group_sids = 1;
896 group_sids = TALLOC_ARRAY(tmp_ctx, struct dom_sid, num_group_sids);
897 if (group_sids == NULL) {
898 DEBUG(1, ("TALLOC_ARRAY failed\n"));
899 result = NT_STATUS_NO_MEMORY;
900 goto done;
901 }
902
903 sid_copy(&group_sids[0], &user_sid);
904 sid_split_rid(&group_sids[0], &dummy);
905 sid_append_rid(&group_sids[0], DOMAIN_RID_USERS);
906
907 if (!sid_to_gid(&group_sids[0], gid)) {
908 DEBUG(1, ("sid_to_gid(%s) failed\n",
909 sid_string_dbg(&group_sids[0])));
910 goto done;
911 }
912
913 gids = gid;
914
915 /* Ensure we're returning the found_username on the right context. */
916 *found_username = talloc_strdup(mem_ctx, username);
917 }
918
919 /* Add the "Unix Group" SID for each gid to catch mapped groups
920 and their Unix equivalent. This is to solve the backwards
921 compatibility problem of 'valid users = +ntadmin' where
922 ntadmin has been paired with "Domain Admins" in the group
923 mapping table. Otherwise smb.conf would need to be changed
924 to 'valid user = "Domain Admins"'. --jerry */
925
926 num_gids = num_group_sids;
927 for ( i=0; i<num_gids; i++ ) {
928 gid_t high, low;
929
930 /* don't pickup anything managed by Winbind */
931
932 if ( lp_idmap_gid(&low, &high) && (gids[i] >= low) && (gids[i] <= high) )
933 continue;
934
935 gid_to_unix_groups_sid(gids[i], &unix_group_sid);
936
937 result = add_sid_to_array_unique(tmp_ctx, &unix_group_sid,
938 &group_sids, &num_group_sids);
939 if (!NT_STATUS_IS_OK(result)) {
940 goto done;
941 }
942 }
943
944 /* Ensure we're creating the nt_token on the right context. */
945 *token = create_local_nt_token(mem_ctx, &user_sid,
946 is_guest, num_group_sids, group_sids);
947
948 if ((*token == NULL) || (*found_username == NULL)) {
949 result = NT_STATUS_NO_MEMORY;
950 goto done;
951 }
952
953 result = NT_STATUS_OK;
954 done:
955 TALLOC_FREE(tmp_ctx);
956 return result;
957 }
958
959 /***************************************************************************
960 Build upon create_token_from_username:
961
962 Expensive helper function to figure out whether a user given its name is
963 member of a particular group.
964 ***************************************************************************/
965
966 bool user_in_group_sid(const char *username, const struct dom_sid *group_sid)
967 {
968 NTSTATUS status;
969 uid_t uid;
970 gid_t gid;
971 char *found_username;
972 struct security_token *token;
973 bool result;
974 TALLOC_CTX *mem_ctx = talloc_stackframe();
975
976 status = create_token_from_username(mem_ctx, username, False,
977 &uid, &gid, &found_username,
978 &token);
979
980 if (!NT_STATUS_IS_OK(status)) {
981 DEBUG(10, ("could not create token for %s\n", username));
982 TALLOC_FREE(mem_ctx);
983 return False;
984 }
985
986 result = nt_token_check_sid(group_sid, token);
987
988 TALLOC_FREE(mem_ctx);
989 return result;
990 }
991
992 bool user_in_group(const char *username, const char *groupname)
993 {
994 TALLOC_CTX *mem_ctx = talloc_stackframe();
995 struct dom_sid group_sid;
996 bool ret;
997
998 ret = lookup_name(mem_ctx, groupname, LOOKUP_NAME_ALL,
999 NULL, NULL, &group_sid, NULL);
1000 TALLOC_FREE(mem_ctx);
1001
1002 if (!ret) {
1003 DEBUG(10, ("lookup_name for (%s) failed.\n", groupname));
1004 return False;
1005 }
1006
1007 return user_in_group_sid(username, &group_sid);
1008 }
1009
1010 /* END */
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