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s3: Lift the server_messaging_context from notify_job_status
[Samba/gbeck.git] / source3 / auth / token_util.c
blob21d9af1f54643dd1eeeaa6b60f7764597b830426
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
30 #include "../librpc/gen_ndr/netlogon.h"
31
32 /****************************************************************************
33 Check for a SID in an NT_USER_TOKEN
34 ****************************************************************************/
35
36 bool nt_token_check_sid ( const struct dom_sid *sid, const NT_USER_TOKEN *token )
37 {
38 int i;
39
40 if ( !sid || !token )
41 return False;
42
43 for ( i=0; i<token->num_sids; i++ ) {
44 if ( sid_equal( sid, &token->user_sids[i] ) )
45 return True;
46 }
47
48 return False;
49 }
50
51 bool nt_token_check_domain_rid( NT_USER_TOKEN *token, uint32 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 your need to change it.
79 ******************************************************************************/
80
81 NT_USER_TOKEN *get_root_nt_token( void )
82 {
83 struct nt_user_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 nt_user_token);
95 }
96
97 if ( !(pw = sys_getpwuid(0)) ) {
98 if ( !(pw = sys_getpwnam("root")) ) {
99 DEBUG(0,("get_root_nt_token: both sys_getpwuid(0) "
100 "and sys_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_autofree_context(), &u_sid, False,
112 1, &global_sid_Builtin_Administrators);
113
114 token->privileges = se_disk_operators;
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 nt_user_token *token)
132 {
133 uint32 *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->user_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->user_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 nt_user_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->user_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 /**
212 * Create the requested BUILTIN if it doesn't already exist. This requires
213 * winbindd to be running.
214 *
215 * @param[in] rid BUILTIN rid to create
216 * @return Normal NTSTATUS return.
217 */
218 static NTSTATUS create_builtin(uint32 rid)
219 {
220 NTSTATUS status = NT_STATUS_OK;
221 struct dom_sid sid;
222 gid_t gid;
223
224 if (!sid_compose(&sid, &global_sid_Builtin, rid)) {
225 return NT_STATUS_NO_SUCH_ALIAS;
226 }
227
228 if (!sid_to_gid(&sid, &gid)) {
229 if (!lp_winbind_nested_groups() || !winbind_ping()) {
230 return NT_STATUS_PROTOCOL_UNREACHABLE;
231 }
232 status = pdb_create_builtin_alias(rid);
233 }
234 return status;
235 }
236
237 /**
238 * Add sid as a member of builtin_sid.
239 *
240 * @param[in] builtin_sid An existing builtin group.
241 * @param[in] dom_sid sid to add as a member of builtin_sid.
242 * @return Normal NTSTATUS return
243 */
244 static NTSTATUS add_sid_to_builtin(const struct dom_sid *builtin_sid,
245 const struct dom_sid *dom_sid)
246 {
247 NTSTATUS status = NT_STATUS_OK;
248
249 if (!dom_sid || !builtin_sid) {
250 return NT_STATUS_INVALID_PARAMETER;
251 }
252
253 status = pdb_add_aliasmem(builtin_sid, dom_sid);
254
255 if (NT_STATUS_EQUAL(status, NT_STATUS_MEMBER_IN_ALIAS)) {
256 DEBUG(5, ("add_sid_to_builtin %s is already a member of %s\n",
257 sid_string_dbg(dom_sid),
258 sid_string_dbg(builtin_sid)));
259 return NT_STATUS_OK;
260 }
261
262 if (!NT_STATUS_IS_OK(status)) {
263 DEBUG(4, ("add_sid_to_builtin %s could not be added to %s: "
264 "%s\n", sid_string_dbg(dom_sid),
265 sid_string_dbg(builtin_sid), nt_errstr(status)));
266 }
267 return status;
268 }
269
270 /*******************************************************************
271 *******************************************************************/
272
273 NTSTATUS create_builtin_users(const struct dom_sid *dom_sid)
274 {
275 NTSTATUS status;
276 struct dom_sid dom_users;
277
278 status = create_builtin(BUILTIN_RID_USERS);
279 if ( !NT_STATUS_IS_OK(status) ) {
280 DEBUG(5,("create_builtin_users: Failed to create Users\n"));
281 return status;
282 }
283
284 /* add domain users */
285 if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
286 && sid_compose(&dom_users, dom_sid, DOMAIN_RID_USERS))
287 {
288 status = add_sid_to_builtin(&global_sid_Builtin_Users,
289 &dom_users);
290 }
291
292 return status;
293 }
294
295 /*******************************************************************
296 *******************************************************************/
297
298 NTSTATUS create_builtin_administrators(const struct dom_sid *dom_sid)
299 {
300 NTSTATUS status;
301 struct dom_sid dom_admins, root_sid;
302 fstring root_name;
303 enum lsa_SidType type;
304 TALLOC_CTX *ctx;
305 bool ret;
306
307 status = create_builtin(BUILTIN_RID_ADMINISTRATORS);
308 if ( !NT_STATUS_IS_OK(status) ) {
309 DEBUG(5,("create_builtin_administrators: Failed to create Administrators\n"));
310 return status;
311 }
312
313 /* add domain admins */
314 if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
315 && sid_compose(&dom_admins, dom_sid, DOMAIN_RID_ADMINS))
316 {
317 status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
318 &dom_admins);
319 if (!NT_STATUS_IS_OK(status)) {
320 return status;
321 }
322 }
323
324 /* add root */
325 if ( (ctx = talloc_init("create_builtin_administrators")) == NULL ) {
326 return NT_STATUS_NO_MEMORY;
327 }
328 fstr_sprintf( root_name, "%s\\root", get_global_sam_name() );
329 ret = lookup_name(ctx, root_name, LOOKUP_NAME_DOMAIN, NULL, NULL,
330 &root_sid, &type);
331 TALLOC_FREE( ctx );
332
333 if ( ret ) {
334 status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
335 &root_sid);
336 }
337
338 return status;
339 }
340
341 static NTSTATUS finalize_local_nt_token(struct nt_user_token *result,
342 bool is_guest);
343
344 NTSTATUS create_local_nt_token_from_info3(TALLOC_CTX *mem_ctx,
345 bool is_guest,
346 struct netr_SamInfo3 *info3,
347 struct extra_auth_info *extra,
348 struct nt_user_token **ntok)
349 {
350 struct nt_user_token *usrtok = NULL;
351 NTSTATUS status;
352 int i;
353
354 DEBUG(10, ("Create local NT token for %s\n",
355 info3->base.account_name.string));
356
357 usrtok = talloc_zero(mem_ctx, struct nt_user_token);
358 if (!usrtok) {
359 DEBUG(0, ("talloc failed\n"));
360 return NT_STATUS_NO_MEMORY;
361 }
362
363 /* Add the user and primary group sid FIRST */
364 /* check if the user rid is the special "Domain Guests" rid.
365 * If so pick the first sid for the extra sids instead as it
366 * is a local fake account */
367 usrtok->user_sids = talloc_array(usrtok, struct dom_sid, 2);
368 if (!usrtok->user_sids) {
369 TALLOC_FREE(usrtok);
370 return NT_STATUS_NO_MEMORY;
371 }
372 usrtok->num_sids = 2;
373
374 /* USER SID */
375 if (info3->base.rid == (uint32_t)(-1)) {
376 /* this is a signal the user was fake and generated,
377 * the actual SID we want to use is stored in the extra
378 * sids */
379 if (is_null_sid(&extra->user_sid)) {
380 /* we couldn't find the user sid, bail out */
381 DEBUG(3, ("Invalid user SID\n"));
382 TALLOC_FREE(usrtok);
383 return NT_STATUS_UNSUCCESSFUL;
384 }
385 sid_copy(&usrtok->user_sids[0], &extra->user_sid);
386 } else {
387 sid_copy(&usrtok->user_sids[0], info3->base.domain_sid);
388 sid_append_rid(&usrtok->user_sids[0], info3->base.rid);
389 }
390
391 /* GROUP SID */
392 if (info3->base.primary_gid == (uint32_t)(-1)) {
393 /* this is a signal the user was fake and generated,
394 * the actual SID we want to use is stored in the extra
395 * sids */
396 if (is_null_sid(&extra->pgid_sid)) {
397 /* we couldn't find the user sid, bail out */
398 DEBUG(3, ("Invalid group SID\n"));
399 TALLOC_FREE(usrtok);
400 return NT_STATUS_UNSUCCESSFUL;
401 }
402 sid_copy(&usrtok->user_sids[1], &extra->pgid_sid);
403 } else {
404 sid_copy(&usrtok->user_sids[1], info3->base.domain_sid);
405 sid_append_rid(&usrtok->user_sids[1],
406 info3->base.primary_gid);
407 }
408
409 /* Now the SIDs we got from authentication. These are the ones from
410 * the info3 struct or from the pdb_enum_group_memberships, depending
411 * on who authenticated the user.
412 * Note that we start the for loop at "1" here, we already added the
413 * first group sid as primary above. */
414
415 for (i = 0; i < info3->base.groups.count; i++) {
416 struct dom_sid tmp_sid;
417
418 sid_copy(&tmp_sid, info3->base.domain_sid);
419 sid_append_rid(&tmp_sid, info3->base.groups.rids[i].rid);
420
421 status = add_sid_to_array_unique(usrtok, &tmp_sid,
422 &usrtok->user_sids,
423 &usrtok->num_sids);
424 if (!NT_STATUS_IS_OK(status)) {
425 DEBUG(3, ("Failed to add SID to nt token\n"));
426 TALLOC_FREE(usrtok);
427 return status;
428 }
429 }
430
431 /* now also add extra sids if they are not the special user/group
432 * sids */
433 for (i = 0; i < info3->sidcount; i++) {
434 status = add_sid_to_array_unique(usrtok,
435 info3->sids[i].sid,
436 &usrtok->user_sids,
437 &usrtok->num_sids);
438 if (!NT_STATUS_IS_OK(status)) {
439 DEBUG(3, ("Failed to add SID to nt token\n"));
440 TALLOC_FREE(usrtok);
441 return status;
442 }
443 }
444
445 status = finalize_local_nt_token(usrtok, is_guest);
446 if (!NT_STATUS_IS_OK(status)) {
447 DEBUG(3, ("Failed to finalize nt token\n"));
448 TALLOC_FREE(usrtok);
449 return status;
450 }
451
452 *ntok = usrtok;
453 return NT_STATUS_OK;
454 }
455
456 /*******************************************************************
457 Create a NT token for the user, expanding local aliases
458 *******************************************************************/
459
460 struct nt_user_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
461 const struct dom_sid *user_sid,
462 bool is_guest,
463 int num_groupsids,
464 const struct dom_sid *groupsids)
465 {
466 struct nt_user_token *result = NULL;
467 int i;
468 NTSTATUS status;
469
470 DEBUG(10, ("Create local NT token for %s\n",
471 sid_string_dbg(user_sid)));
472
473 if (!(result = TALLOC_ZERO_P(mem_ctx, struct nt_user_token))) {
474 DEBUG(0, ("talloc failed\n"));
475 return NULL;
476 }
477
478 /* Add the user and primary group sid */
479
480 status = add_sid_to_array(result, user_sid,
481 &result->user_sids, &result->num_sids);
482 if (!NT_STATUS_IS_OK(status)) {
483 TALLOC_FREE(result);
484 return NULL;
485 }
486
487 /* For guest, num_groupsids may be zero. */
488 if (num_groupsids) {
489 status = add_sid_to_array(result, &groupsids[0],
490 &result->user_sids,
491 &result->num_sids);
492 if (!NT_STATUS_IS_OK(status)) {
493 TALLOC_FREE(result);
494 return NULL;
495 }
496 }
497
498 /* Now the SIDs we got from authentication. These are the ones from
499 * the info3 struct or from the pdb_enum_group_memberships, depending
500 * on who authenticated the user.
501 * Note that we start the for loop at "1" here, we already added the
502 * first group sid as primary above. */
503
504 for (i=1; i<num_groupsids; i++) {
505 status = add_sid_to_array_unique(result, &groupsids[i],
506 &result->user_sids,
507 &result->num_sids);
508 if (!NT_STATUS_IS_OK(status)) {
509 TALLOC_FREE(result);
510 return NULL;
511 }
512 }
513
514 status = finalize_local_nt_token(result, is_guest);
515 if (!NT_STATUS_IS_OK(status)) {
516 TALLOC_FREE(result);
517 return NULL;
518 }
519
520 return result;
521 }
522
523 static NTSTATUS finalize_local_nt_token(struct nt_user_token *result,
524 bool is_guest)
525 {
526 struct dom_sid dom_sid;
527 gid_t gid;
528 NTSTATUS status;
529
530 /* Add in BUILTIN sids */
531
532 status = add_sid_to_array(result, &global_sid_World,
533 &result->user_sids, &result->num_sids);
534 if (!NT_STATUS_IS_OK(status)) {
535 return status;
536 }
537 status = add_sid_to_array(result, &global_sid_Network,
538 &result->user_sids, &result->num_sids);
539 if (!NT_STATUS_IS_OK(status)) {
540 return status;
541 }
542
543 if (is_guest) {
544 status = add_sid_to_array(result, &global_sid_Builtin_Guests,
545 &result->user_sids,
546 &result->num_sids);
547 if (!NT_STATUS_IS_OK(status)) {
548 return status;
549 }
550 } else {
551 status = add_sid_to_array(result,
552 &global_sid_Authenticated_Users,
553 &result->user_sids,
554 &result->num_sids);
555 if (!NT_STATUS_IS_OK(status)) {
556 return status;
557 }
558 }
559
560 /* Deal with the BUILTIN\Administrators group. If the SID can
561 be resolved then assume that the add_aliasmem( S-1-5-32 )
562 handled it. */
563
564 if (!sid_to_gid(&global_sid_Builtin_Administrators, &gid)) {
565
566 become_root();
567 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
568 status = NT_STATUS_OK;
569 DEBUG(3, ("Failed to fetch domain sid for %s\n",
570 lp_workgroup()));
571 } else {
572 status = create_builtin_administrators(&dom_sid);
573 }
574 unbecome_root();
575
576 if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) {
577 /* Add BUILTIN\Administrators directly to token. */
578 status = add_builtin_administrators(result, &dom_sid);
579 if ( !NT_STATUS_IS_OK(status) ) {
580 DEBUG(3, ("Failed to check for local "
581 "Administrators membership (%s)\n",
582 nt_errstr(status)));
583 }
584 } else if (!NT_STATUS_IS_OK(status)) {
585 DEBUG(2, ("WARNING: Failed to create "
586 "BUILTIN\\Administrators group! Can "
587 "Winbind allocate gids?\n"));
588 }
589 }
590
591 /* Deal with the BUILTIN\Users group. If the SID can
592 be resolved then assume that the add_aliasmem( S-1-5-32 )
593 handled it. */
594
595 if (!sid_to_gid(&global_sid_Builtin_Users, &gid)) {
596
597 become_root();
598 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
599 status = NT_STATUS_OK;
600 DEBUG(3, ("Failed to fetch domain sid for %s\n",
601 lp_workgroup()));
602 } else {
603 status = create_builtin_users(&dom_sid);
604 }
605 unbecome_root();
606
607 if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) &&
608 !NT_STATUS_IS_OK(status))
609 {
610 DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! "
611 "Can Winbind allocate gids?\n"));
612 }
613 }
614
615 /* Deal with local groups */
616
617 if (lp_winbind_nested_groups()) {
618
619 become_root();
620
621 /* Now add the aliases. First the one from our local SAM */
622
623 status = add_aliases(get_global_sam_sid(), result);
624
625 if (!NT_STATUS_IS_OK(status)) {
626 unbecome_root();
627 return status;
628 }
629
630 /* Finally the builtin ones */
631
632 status = add_aliases(&global_sid_Builtin, result);
633
634 if (!NT_STATUS_IS_OK(status)) {
635 unbecome_root();
636 return status;
637 }
638
639 unbecome_root();
640 }
641
642 /* Add privileges based on current user sids */
643
644 get_privileges_for_sids(&result->privileges, result->user_sids,
645 result->num_sids);
646
647 return NT_STATUS_OK;
648 }
649
650 /****************************************************************************
651 prints a NT_USER_TOKEN to debug output.
652 ****************************************************************************/
653
654 void debug_nt_user_token(int dbg_class, int dbg_lev, NT_USER_TOKEN *token)
655 {
656 size_t i;
657
658 if (!token) {
659 DEBUGC(dbg_class, dbg_lev, ("NT user token: (NULL)\n"));
660 return;
661 }
662
663 DEBUGC(dbg_class, dbg_lev,
664 ("NT user token of user %s\n",
665 sid_string_dbg(&token->user_sids[0]) ));
666 DEBUGADDC(dbg_class, dbg_lev,
667 ("contains %lu SIDs\n", (unsigned long)token->num_sids));
668 for (i = 0; i < token->num_sids; i++)
669 DEBUGADDC(dbg_class, dbg_lev,
670 ("SID[%3lu]: %s\n", (unsigned long)i,
671 sid_string_dbg(&token->user_sids[i])));
672
673 dump_se_priv( dbg_class, dbg_lev, &token->privileges );
674 }
675
676 /****************************************************************************
677 prints a UNIX 'token' to debug output.
678 ****************************************************************************/
679
680 void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
681 int n_groups, gid_t *groups)
682 {
683 int i;
684 DEBUGC(dbg_class, dbg_lev,
685 ("UNIX token of user %ld\n", (long int)uid));
686
687 DEBUGADDC(dbg_class, dbg_lev,
688 ("Primary group is %ld and contains %i supplementary "
689 "groups\n", (long int)gid, n_groups));
690 for (i = 0; i < n_groups; i++)
691 DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
692 (long int)groups[i]));
693 }
694
695 /*
696 * Create an artificial NT token given just a username. (Initially intended
697 * for force user)
698 *
699 * We go through lookup_name() to avoid problems we had with 'winbind use
700 * default domain'.
701 *
702 * We have 3 cases:
703 *
704 * unmapped unix users: Go directly to nss to find the user's group.
705 *
706 * A passdb user: The list of groups is provided by pdb_enum_group_memberships.
707 *
708 * If the user is provided by winbind, the primary gid is set to "domain
709 * users" of the user's domain. For an explanation why this is necessary, see
710 * the thread starting at
711 * http://lists.samba.org/archive/samba-technical/2006-January/044803.html.
712 */
713
714 NTSTATUS create_token_from_username(TALLOC_CTX *mem_ctx, const char *username,
715 bool is_guest,
716 uid_t *uid, gid_t *gid,
717 char **found_username,
718 struct nt_user_token **token)
719 {
720 NTSTATUS result = NT_STATUS_NO_SUCH_USER;
721 TALLOC_CTX *tmp_ctx = talloc_stackframe();
722 struct dom_sid user_sid;
723 enum lsa_SidType type;
724 gid_t *gids;
725 struct dom_sid *group_sids;
726 struct dom_sid unix_group_sid;
727 size_t num_group_sids;
728 size_t num_gids;
729 size_t i;
730
731 if (!lookup_name_smbconf(tmp_ctx, username, LOOKUP_NAME_ALL,
732 NULL, NULL, &user_sid, &type)) {
733 DEBUG(1, ("lookup_name_smbconf for %s failed\n", username));
734 goto done;
735 }
736
737 if (type != SID_NAME_USER) {
738 DEBUG(1, ("%s is a %s, not a user\n", username,
739 sid_type_lookup(type)));
740 goto done;
741 }
742
743 if (sid_check_is_in_our_domain(&user_sid)) {
744 bool ret;
745
746 /* This is a passdb user, so ask passdb */
747
748 struct samu *sam_acct = NULL;
749
750 if ( !(sam_acct = samu_new( tmp_ctx )) ) {
751 result = NT_STATUS_NO_MEMORY;
752 goto done;
753 }
754
755 become_root();
756 ret = pdb_getsampwsid(sam_acct, &user_sid);
757 unbecome_root();
758
759 if (!ret) {
760 DEBUG(1, ("pdb_getsampwsid(%s) for user %s failed\n",
761 sid_string_dbg(&user_sid), username));
762 DEBUGADD(1, ("Fall back to unix user %s\n", username));
763 goto unix_user;
764 }
765
766 result = pdb_enum_group_memberships(tmp_ctx, sam_acct,
767 &group_sids, &gids,
768 &num_group_sids);
769 if (!NT_STATUS_IS_OK(result)) {
770 DEBUG(1, ("enum_group_memberships failed for %s (%s): "
771 "%s\n", username, sid_string_dbg(&user_sid),
772 nt_errstr(result)));
773 DEBUGADD(1, ("Fall back to unix user %s\n", username));
774 goto unix_user;
775 }
776
777 /* see the smb_panic() in pdb_default_enum_group_memberships */
778 SMB_ASSERT(num_group_sids > 0);
779
780 *gid = gids[0];
781
782 /* Ensure we're returning the found_username on the right context. */
783 *found_username = talloc_strdup(mem_ctx,
784 pdb_get_username(sam_acct));
785
786 /*
787 * If the SID from lookup_name() was the guest sid, passdb knows
788 * about the mapping of guest sid to lp_guestaccount()
789 * username and will return the unix_pw info for a guest
790 * user. Use it if it's there, else lookup the *uid details
791 * using getpwnam_alloc(). See bug #6291 for details. JRA.
792 */
793
794 /* We must always assign the *uid. */
795 if (sam_acct->unix_pw == NULL) {
796 struct passwd *pwd = getpwnam_alloc(sam_acct, *found_username );
797 if (!pwd) {
798 DEBUG(10, ("getpwnam_alloc failed for %s\n",
799 *found_username));
800 result = NT_STATUS_NO_SUCH_USER;
801 goto done;
802 }
803 result = samu_set_unix(sam_acct, pwd );
804 if (!NT_STATUS_IS_OK(result)) {
805 DEBUG(10, ("samu_set_unix failed for %s\n",
806 *found_username));
807 result = NT_STATUS_NO_SUCH_USER;
808 goto done;
809 }
810 }
811 *uid = sam_acct->unix_pw->pw_uid;
812
813 } else if (sid_check_is_in_unix_users(&user_sid)) {
814
815 /* This is a unix user not in passdb. We need to ask nss
816 * directly, without consulting passdb */
817
818 struct passwd *pass;
819
820 /*
821 * This goto target is used as a fallback for the passdb
822 * case. The concrete bug report is when passdb gave us an
823 * unmapped gid.
824 */
825
826 unix_user:
827
828 if (!sid_to_uid(&user_sid, uid)) {
829 DEBUG(1, ("unix_user case, sid_to_uid for %s (%s) failed\n",
830 username, sid_string_dbg(&user_sid)));
831 result = NT_STATUS_NO_SUCH_USER;
832 goto done;
833 }
834
835 uid_to_unix_users_sid(*uid, &user_sid);
836
837 pass = getpwuid_alloc(tmp_ctx, *uid);
838 if (pass == NULL) {
839 DEBUG(1, ("getpwuid(%u) for user %s failed\n",
840 (unsigned int)*uid, username));
841 goto done;
842 }
843
844 if (!getgroups_unix_user(tmp_ctx, username, pass->pw_gid,
845 &gids, &num_group_sids)) {
846 DEBUG(1, ("getgroups_unix_user for user %s failed\n",
847 username));
848 goto done;
849 }
850
851 if (num_group_sids) {
852 group_sids = TALLOC_ARRAY(tmp_ctx, struct dom_sid, num_group_sids);
853 if (group_sids == NULL) {
854 DEBUG(1, ("TALLOC_ARRAY failed\n"));
855 result = NT_STATUS_NO_MEMORY;
856 goto done;
857 }
858 } else {
859 group_sids = NULL;
860 }
861
862 for (i=0; i<num_group_sids; i++) {
863 gid_to_sid(&group_sids[i], gids[i]);
864 }
865
866 /* In getgroups_unix_user we always set the primary gid */
867 SMB_ASSERT(num_group_sids > 0);
868
869 *gid = gids[0];
870
871 /* Ensure we're returning the found_username on the right context. */
872 *found_username = talloc_strdup(mem_ctx, pass->pw_name);
873 } else {
874
875 /* This user is from winbind, force the primary gid to the
876 * user's "domain users" group. Under certain circumstances
877 * (user comes from NT4), this might be a loss of
878 * information. But we can not rely on winbind getting the
879 * correct info. AD might prohibit winbind looking up that
880 * information. */
881
882 uint32 dummy;
883
884 /* We must always assign the *uid. */
885 if (!sid_to_uid(&user_sid, uid)) {
886 DEBUG(1, ("winbindd case, sid_to_uid for %s (%s) failed\n",
887 username, sid_string_dbg(&user_sid)));
888 result = NT_STATUS_NO_SUCH_USER;
889 goto done;
890 }
891
892 num_group_sids = 1;
893 group_sids = TALLOC_ARRAY(tmp_ctx, struct dom_sid, num_group_sids);
894 if (group_sids == NULL) {
895 DEBUG(1, ("TALLOC_ARRAY failed\n"));
896 result = NT_STATUS_NO_MEMORY;
897 goto done;
898 }
899
900 sid_copy(&group_sids[0], &user_sid);
901 sid_split_rid(&group_sids[0], &dummy);
902 sid_append_rid(&group_sids[0], DOMAIN_RID_USERS);
903
904 if (!sid_to_gid(&group_sids[0], gid)) {
905 DEBUG(1, ("sid_to_gid(%s) failed\n",
906 sid_string_dbg(&group_sids[0])));
907 goto done;
908 }
909
910 gids = gid;
911
912 /* Ensure we're returning the found_username on the right context. */
913 *found_username = talloc_strdup(mem_ctx, username);
914 }
915
916 /* Add the "Unix Group" SID for each gid to catch mapped groups
917 and their Unix equivalent. This is to solve the backwards
918 compatibility problem of 'valid users = +ntadmin' where
919 ntadmin has been paired with "Domain Admins" in the group
920 mapping table. Otherwise smb.conf would need to be changed
921 to 'valid user = "Domain Admins"'. --jerry */
922
923 num_gids = num_group_sids;
924 for ( i=0; i<num_gids; i++ ) {
925 gid_t high, low;
926
927 /* don't pickup anything managed by Winbind */
928
929 if ( lp_idmap_gid(&low, &high) && (gids[i] >= low) && (gids[i] <= high) )
930 continue;
931
932 gid_to_unix_groups_sid(gids[i], &unix_group_sid);
933
934 result = add_sid_to_array_unique(tmp_ctx, &unix_group_sid,
935 &group_sids, &num_group_sids);
936 if (!NT_STATUS_IS_OK(result)) {
937 goto done;
938 }
939 }
940
941 /* Ensure we're creating the nt_token on the right context. */
942 *token = create_local_nt_token(mem_ctx, &user_sid,
943 is_guest, num_group_sids, group_sids);
944
945 if ((*token == NULL) || (*found_username == NULL)) {
946 result = NT_STATUS_NO_MEMORY;
947 goto done;
948 }
949
950 result = NT_STATUS_OK;
951 done:
952 TALLOC_FREE(tmp_ctx);
953 return result;
954 }
955
956 /***************************************************************************
957 Build upon create_token_from_username:
958
959 Expensive helper function to figure out whether a user given its name is
960 member of a particular group.
961 ***************************************************************************/
962
963 bool user_in_group_sid(const char *username, const struct dom_sid *group_sid)
964 {
965 NTSTATUS status;
966 uid_t uid;
967 gid_t gid;
968 char *found_username;
969 struct nt_user_token *token;
970 bool result;
971 TALLOC_CTX *mem_ctx = talloc_stackframe();
972
973 status = create_token_from_username(mem_ctx, username, False,
974 &uid, &gid, &found_username,
975 &token);
976
977 if (!NT_STATUS_IS_OK(status)) {
978 DEBUG(10, ("could not create token for %s\n", username));
979 TALLOC_FREE(mem_ctx);
980 return False;
981 }
982
983 result = nt_token_check_sid(group_sid, token);
984
985 TALLOC_FREE(mem_ctx);
986 return result;
987 }
988
989 bool user_in_group(const char *username, const char *groupname)
990 {
991 TALLOC_CTX *mem_ctx = talloc_stackframe();
992 struct dom_sid group_sid;
993 bool ret;
994
995 ret = lookup_name(mem_ctx, groupname, LOOKUP_NAME_ALL,
996 NULL, NULL, &group_sid, NULL);
997 TALLOC_FREE(mem_ctx);
998
999 if (!ret) {
1000 DEBUG(10, ("lookup_name for (%s) failed.\n", groupname));
1001 return False;
1002 }
1003
1004 return user_in_group_sid(username, &group_sid);
1005 }
1006
1007 /* END */
WIP