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Add check_user_share_access() which factors out the share security and read_only...
[Samba/bb.git] / source3 / auth / token_util.c
blobac242f17f047d2d0e6120aeb30833cd606ed0fe5
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 "system/passwd.h"
29 #include "auth.h"
30 #include "secrets.h"
31 #include "memcache.h"
32 #include "../librpc/gen_ndr/netlogon.h"
33 #include "../libcli/security/security.h"
34 #include "../lib/util/util_pw.h"
35 #include "passdb.h"
36 #include "lib/privileges.h"
37
38 /****************************************************************************
39 Check for a SID in an struct security_token
40 ****************************************************************************/
41
42 bool nt_token_check_sid ( const struct dom_sid *sid, const struct security_token *token )
43 {
44 if ( !sid || !token )
45 return False;
46
47 return security_token_has_sid(token, sid);
48 }
49
50 bool nt_token_check_domain_rid( struct security_token *token, uint32 rid )
51 {
52 struct dom_sid domain_sid;
53
54 /* if we are a domain member, the get the domain SID, else for
55 a DC or standalone server, use our own SID */
56
57 if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
58 if ( !secrets_fetch_domain_sid( lp_workgroup(),
59 &domain_sid ) ) {
60 DEBUG(1,("nt_token_check_domain_rid: Cannot lookup "
61 "SID for domain [%s]\n", lp_workgroup()));
62 return False;
63 }
64 }
65 else
66 sid_copy( &domain_sid, get_global_sam_sid() );
67
68 sid_append_rid( &domain_sid, rid );
69
70 return nt_token_check_sid( &domain_sid, token );\
71 }
72
73 /******************************************************************************
74 Create a token for the root user to be used internally by smbd.
75 This is similar to running under the context of the LOCAL_SYSTEM account
76 in Windows. This is a read-only token. Do not modify it or free() it.
77 Create a copy if you need to change it.
78 ******************************************************************************/
79
80 struct security_token *get_root_nt_token( void )
81 {
82 struct security_token *token, *for_cache;
83 struct dom_sid u_sid, g_sid;
84 struct passwd *pw;
85 void *cache_data;
86
87 cache_data = memcache_lookup_talloc(
88 NULL, SINGLETON_CACHE_TALLOC,
89 data_blob_string_const_null("root_nt_token"));
90
91 if (cache_data != NULL) {
92 return talloc_get_type_abort(
93 cache_data, struct security_token);
94 }
95
96 if ( !(pw = getpwuid(0)) ) {
97 if ( !(pw = getpwnam("root")) ) {
98 DEBUG(0,("get_root_nt_token: both getpwuid(0) "
99 "and getpwnam(\"root\") failed!\n"));
100 return NULL;
101 }
102 }
103
104 /* get the user and primary group SIDs; although the
105 BUILTIN\Administrators SId is really the one that matters here */
106
107 uid_to_sid(&u_sid, pw->pw_uid);
108 gid_to_sid(&g_sid, pw->pw_gid);
109
110 token = create_local_nt_token(talloc_tos(), &u_sid, False,
111 1, &global_sid_Builtin_Administrators);
112
113 security_token_set_privilege(token, SEC_PRIV_DISK_OPERATOR);
114
115 for_cache = token;
116
117 memcache_add_talloc(
118 NULL, SINGLETON_CACHE_TALLOC,
119 data_blob_string_const_null("root_nt_token"), &for_cache);
120
121 return token;
122 }
123
124
125 /*
126 * Add alias SIDs from memberships within the partially created token SID list
127 */
128
129 NTSTATUS add_aliases(const struct dom_sid *domain_sid,
130 struct security_token *token)
131 {
132 uint32 *aliases;
133 size_t i, num_aliases;
134 NTSTATUS status;
135 TALLOC_CTX *tmp_ctx;
136
137 if (!(tmp_ctx = talloc_init("add_aliases"))) {
138 return NT_STATUS_NO_MEMORY;
139 }
140
141 aliases = NULL;
142 num_aliases = 0;
143
144 status = pdb_enum_alias_memberships(tmp_ctx, domain_sid,
145 token->sids,
146 token->num_sids,
147 &aliases, &num_aliases);
148
149 if (!NT_STATUS_IS_OK(status)) {
150 DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n",
151 nt_errstr(status)));
152 goto done;
153 }
154
155 for (i=0; i<num_aliases; i++) {
156 struct dom_sid alias_sid;
157 sid_compose(&alias_sid, domain_sid, aliases[i]);
158 status = add_sid_to_array_unique(token, &alias_sid,
159 &token->sids,
160 &token->num_sids);
161 if (!NT_STATUS_IS_OK(status)) {
162 DEBUG(0, ("add_sid_to_array failed\n"));
163 goto done;
164 }
165 }
166
167 done:
168 TALLOC_FREE(tmp_ctx);
169 return NT_STATUS_OK;
170 }
171
172 /*******************************************************************
173 *******************************************************************/
174
175 static NTSTATUS add_builtin_administrators(struct security_token *token,
176 const struct dom_sid *dom_sid)
177 {
178 struct dom_sid domadm;
179 NTSTATUS status;
180
181 /* nothing to do if we aren't in a domain */
182
183 if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) {
184 return NT_STATUS_OK;
185 }
186
187 /* Find the Domain Admins SID */
188
189 if ( IS_DC ) {
190 sid_copy( &domadm, get_global_sam_sid() );
191 } else {
192 sid_copy(&domadm, dom_sid);
193 }
194 sid_append_rid( &domadm, DOMAIN_RID_ADMINS );
195
196 /* Add Administrators if the user beloongs to Domain Admins */
197
198 if ( nt_token_check_sid( &domadm, token ) ) {
199 status = add_sid_to_array(token,
200 &global_sid_Builtin_Administrators,
201 &token->sids, &token->num_sids);
202 if (!NT_STATUS_IS_OK(status)) {
203 return status;
204 }
205 }
206
207 return NT_STATUS_OK;
208 }
209
210 static NTSTATUS finalize_local_nt_token(struct security_token *result,
211 bool is_guest);
212
213 NTSTATUS create_local_nt_token_from_info3(TALLOC_CTX *mem_ctx,
214 bool is_guest,
215 const struct netr_SamInfo3 *info3,
216 const struct extra_auth_info *extra,
217 struct security_token **ntok)
218 {
219 struct security_token *usrtok = NULL;
220 NTSTATUS status;
221 int i;
222
223 DEBUG(10, ("Create local NT token for %s\n",
224 info3->base.account_name.string));
225
226 usrtok = talloc_zero(mem_ctx, struct security_token);
227 if (!usrtok) {
228 DEBUG(0, ("talloc failed\n"));
229 return NT_STATUS_NO_MEMORY;
230 }
231
232 /* Add the user and primary group sid FIRST */
233 /* check if the user rid is the special "Domain Guests" rid.
234 * If so pick the first sid for the extra sids instead as it
235 * is a local fake account */
236 usrtok->sids = talloc_array(usrtok, struct dom_sid, 2);
237 if (!usrtok->sids) {
238 TALLOC_FREE(usrtok);
239 return NT_STATUS_NO_MEMORY;
240 }
241 usrtok->num_sids = 2;
242
243 /* USER SID */
244 if (info3->base.rid == (uint32_t)(-1)) {
245 /* this is a signal the user was fake and generated,
246 * the actual SID we want to use is stored in the extra
247 * sids */
248 if (is_null_sid(&extra->user_sid)) {
249 /* we couldn't find the user sid, bail out */
250 DEBUG(3, ("Invalid user SID\n"));
251 TALLOC_FREE(usrtok);
252 return NT_STATUS_UNSUCCESSFUL;
253 }
254 sid_copy(&usrtok->sids[0], &extra->user_sid);
255 } else {
256 sid_copy(&usrtok->sids[0], info3->base.domain_sid);
257 sid_append_rid(&usrtok->sids[0], info3->base.rid);
258 }
259
260 /* GROUP SID */
261 if (info3->base.primary_gid == (uint32_t)(-1)) {
262 /* this is a signal the user was fake and generated,
263 * the actual SID we want to use is stored in the extra
264 * sids */
265 if (is_null_sid(&extra->pgid_sid)) {
266 /* we couldn't find the user sid, bail out */
267 DEBUG(3, ("Invalid group SID\n"));
268 TALLOC_FREE(usrtok);
269 return NT_STATUS_UNSUCCESSFUL;
270 }
271 sid_copy(&usrtok->sids[1], &extra->pgid_sid);
272 } else {
273 sid_copy(&usrtok->sids[1], info3->base.domain_sid);
274 sid_append_rid(&usrtok->sids[1],
275 info3->base.primary_gid);
276 }
277
278 /* Now the SIDs we got from authentication. These are the ones from
279 * the info3 struct or from the pdb_enum_group_memberships, depending
280 * on who authenticated the user.
281 * Note that we start the for loop at "1" here, we already added the
282 * first group sid as primary above. */
283
284 for (i = 0; i < info3->base.groups.count; i++) {
285 struct dom_sid tmp_sid;
286
287 sid_copy(&tmp_sid, info3->base.domain_sid);
288 sid_append_rid(&tmp_sid, info3->base.groups.rids[i].rid);
289
290 status = add_sid_to_array_unique(usrtok, &tmp_sid,
291 &usrtok->sids,
292 &usrtok->num_sids);
293 if (!NT_STATUS_IS_OK(status)) {
294 DEBUG(3, ("Failed to add SID to nt token\n"));
295 TALLOC_FREE(usrtok);
296 return status;
297 }
298 }
299
300 /* now also add extra sids if they are not the special user/group
301 * sids */
302 for (i = 0; i < info3->sidcount; i++) {
303 status = add_sid_to_array_unique(usrtok,
304 info3->sids[i].sid,
305 &usrtok->sids,
306 &usrtok->num_sids);
307 if (!NT_STATUS_IS_OK(status)) {
308 DEBUG(3, ("Failed to add SID to nt token\n"));
309 TALLOC_FREE(usrtok);
310 return status;
311 }
312 }
313
314 status = finalize_local_nt_token(usrtok, is_guest);
315 if (!NT_STATUS_IS_OK(status)) {
316 DEBUG(3, ("Failed to finalize nt token\n"));
317 TALLOC_FREE(usrtok);
318 return status;
319 }
320
321 *ntok = usrtok;
322 return NT_STATUS_OK;
323 }
324
325 /*******************************************************************
326 Create a NT token for the user, expanding local aliases
327 *******************************************************************/
328
329 struct security_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
330 const struct dom_sid *user_sid,
331 bool is_guest,
332 int num_groupsids,
333 const struct dom_sid *groupsids)
334 {
335 struct security_token *result = NULL;
336 int i;
337 NTSTATUS status;
338
339 DEBUG(10, ("Create local NT token for %s\n",
340 sid_string_dbg(user_sid)));
341
342 if (!(result = talloc_zero(mem_ctx, struct security_token))) {
343 DEBUG(0, ("talloc failed\n"));
344 return NULL;
345 }
346
347 /* Add the user and primary group sid */
348
349 status = add_sid_to_array(result, user_sid,
350 &result->sids, &result->num_sids);
351 if (!NT_STATUS_IS_OK(status)) {
352 TALLOC_FREE(result);
353 return NULL;
354 }
355
356 /* For guest, num_groupsids may be zero. */
357 if (num_groupsids) {
358 status = add_sid_to_array(result, &groupsids[0],
359 &result->sids,
360 &result->num_sids);
361 if (!NT_STATUS_IS_OK(status)) {
362 TALLOC_FREE(result);
363 return NULL;
364 }
365 }
366
367 /* Now the SIDs we got from authentication. These are the ones from
368 * the info3 struct or from the pdb_enum_group_memberships, depending
369 * on who authenticated the user.
370 * Note that we start the for loop at "1" here, we already added the
371 * first group sid as primary above. */
372
373 for (i=1; i<num_groupsids; i++) {
374 status = add_sid_to_array_unique(result, &groupsids[i],
375 &result->sids,
376 &result->num_sids);
377 if (!NT_STATUS_IS_OK(status)) {
378 TALLOC_FREE(result);
379 return NULL;
380 }
381 }
382
383 status = finalize_local_nt_token(result, is_guest);
384 if (!NT_STATUS_IS_OK(status)) {
385 TALLOC_FREE(result);
386 return NULL;
387 }
388
389 return result;
390 }
391
392 static NTSTATUS finalize_local_nt_token(struct security_token *result,
393 bool is_guest)
394 {
395 struct dom_sid dom_sid;
396 gid_t gid;
397 NTSTATUS status;
398
399 /* Add in BUILTIN sids */
400
401 status = add_sid_to_array(result, &global_sid_World,
402 &result->sids, &result->num_sids);
403 if (!NT_STATUS_IS_OK(status)) {
404 return status;
405 }
406 status = add_sid_to_array(result, &global_sid_Network,
407 &result->sids, &result->num_sids);
408 if (!NT_STATUS_IS_OK(status)) {
409 return status;
410 }
411
412 if (is_guest) {
413 status = add_sid_to_array(result, &global_sid_Builtin_Guests,
414 &result->sids,
415 &result->num_sids);
416 if (!NT_STATUS_IS_OK(status)) {
417 return status;
418 }
419 } else {
420 status = add_sid_to_array(result,
421 &global_sid_Authenticated_Users,
422 &result->sids,
423 &result->num_sids);
424 if (!NT_STATUS_IS_OK(status)) {
425 return status;
426 }
427 }
428
429 /* Deal with the BUILTIN\Administrators group. If the SID can
430 be resolved then assume that the add_aliasmem( S-1-5-32 )
431 handled it. */
432
433 if (!sid_to_gid(&global_sid_Builtin_Administrators, &gid)) {
434
435 become_root();
436 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
437 status = NT_STATUS_OK;
438 DEBUG(3, ("Failed to fetch domain sid for %s\n",
439 lp_workgroup()));
440 } else {
441 status = create_builtin_administrators(&dom_sid);
442 }
443 unbecome_root();
444
445 if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) {
446 /* Add BUILTIN\Administrators directly to token. */
447 status = add_builtin_administrators(result, &dom_sid);
448 if ( !NT_STATUS_IS_OK(status) ) {
449 DEBUG(3, ("Failed to check for local "
450 "Administrators membership (%s)\n",
451 nt_errstr(status)));
452 }
453 } else if (!NT_STATUS_IS_OK(status)) {
454 DEBUG(2, ("WARNING: Failed to create "
455 "BUILTIN\\Administrators group! Can "
456 "Winbind allocate gids?\n"));
457 }
458 }
459
460 /* Deal with the BUILTIN\Users group. If the SID can
461 be resolved then assume that the add_aliasmem( S-1-5-32 )
462 handled it. */
463
464 if (!sid_to_gid(&global_sid_Builtin_Users, &gid)) {
465
466 become_root();
467 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
468 status = NT_STATUS_OK;
469 DEBUG(3, ("Failed to fetch domain sid for %s\n",
470 lp_workgroup()));
471 } else {
472 status = create_builtin_users(&dom_sid);
473 }
474 unbecome_root();
475
476 if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) &&
477 !NT_STATUS_IS_OK(status))
478 {
479 DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! "
480 "Can Winbind allocate gids?\n"));
481 }
482 }
483
484 /* Deal with local groups */
485
486 if (lp_winbind_nested_groups()) {
487
488 become_root();
489
490 /* Now add the aliases. First the one from our local SAM */
491
492 status = add_aliases(get_global_sam_sid(), result);
493
494 if (!NT_STATUS_IS_OK(status)) {
495 unbecome_root();
496 return status;
497 }
498
499 /* Finally the builtin ones */
500
501 status = add_aliases(&global_sid_Builtin, result);
502
503 if (!NT_STATUS_IS_OK(status)) {
504 unbecome_root();
505 return status;
506 }
507
508 unbecome_root();
509 }
510
511 /* Add privileges based on current user sids */
512
513 get_privileges_for_sids(&result->privilege_mask, result->sids,
514 result->num_sids);
515
516 return NT_STATUS_OK;
517 }
518
519 /****************************************************************************
520 prints a UNIX 'token' to debug output.
521 ****************************************************************************/
522
523 void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
524 int n_groups, gid_t *groups)
525 {
526 int i;
527 DEBUGC(dbg_class, dbg_lev,
528 ("UNIX token of user %ld\n", (long int)uid));
529
530 DEBUGADDC(dbg_class, dbg_lev,
531 ("Primary group is %ld and contains %i supplementary "
532 "groups\n", (long int)gid, n_groups));
533 for (i = 0; i < n_groups; i++)
534 DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
535 (long int)groups[i]));
536 }
537
538 /*
539 * Create an artificial NT token given just a domain SID.
540 *
541 * We have 3 cases:
542 *
543 * unmapped unix users: Go directly to nss to find the user's group.
544 *
545 * A passdb user: The list of groups is provided by pdb_enum_group_memberships.
546 *
547 * If the user is provided by winbind, the primary gid is set to "domain
548 * users" of the user's domain. For an explanation why this is necessary, see
549 * the thread starting at
550 * http://lists.samba.org/archive/samba-technical/2006-January/044803.html.
551 */
552
553 static NTSTATUS create_token_from_sid(TALLOC_CTX *mem_ctx,
554 const struct dom_sid *user_sid,
555 bool is_guest,
556 uid_t *uid, gid_t *gid,
557 char **found_username,
558 struct security_token **token)
559 {
560 NTSTATUS result = NT_STATUS_NO_SUCH_USER;
561 TALLOC_CTX *tmp_ctx = talloc_stackframe();
562 gid_t *gids;
563 struct dom_sid *group_sids;
564 struct dom_sid unix_group_sid;
565 uint32_t num_group_sids;
566 uint32_t num_gids;
567 uint32_t i;
568
569 if (sid_check_is_in_our_sam(user_sid)) {
570 bool ret;
571 uint32_t pdb_num_group_sids;
572 /* This is a passdb user, so ask passdb */
573
574 struct samu *sam_acct = NULL;
575
576 if ( !(sam_acct = samu_new( tmp_ctx )) ) {
577 result = NT_STATUS_NO_MEMORY;
578 goto done;
579 }
580
581 become_root();
582 ret = pdb_getsampwsid(sam_acct, user_sid);
583 unbecome_root();
584
585 if (!ret) {
586 DEBUG(1, ("pdb_getsampwsid(%s) failed\n",
587 sid_string_dbg(user_sid)));
588 DEBUGADD(1, ("Fall back to unix user\n"));
589 goto unix_user;
590 }
591
592 result = pdb_enum_group_memberships(tmp_ctx, sam_acct,
593 &group_sids, &gids,
594 &pdb_num_group_sids);
595 if (!NT_STATUS_IS_OK(result)) {
596 DEBUG(1, ("enum_group_memberships failed for %s: "
597 "%s\n", sid_string_dbg(user_sid),
598 nt_errstr(result)));
599 DEBUGADD(1, ("Fall back to unix uid lookup\n"));
600 goto unix_user;
601 }
602 num_group_sids = pdb_num_group_sids;
603
604 /* see the smb_panic() in pdb_default_enum_group_memberships */
605 SMB_ASSERT(num_group_sids > 0);
606
607 *gid = gids[0];
608
609 /* Ensure we're returning the found_username on the right context. */
610 *found_username = talloc_strdup(mem_ctx,
611 pdb_get_username(sam_acct));
612
613 if (*found_username == NULL) {
614 result = NT_STATUS_NO_MEMORY;
615 goto done;
616 }
617
618 /*
619 * If the SID from lookup_name() was the guest sid, passdb knows
620 * about the mapping of guest sid to lp_guestaccount()
621 * username and will return the unix_pw info for a guest
622 * user. Use it if it's there, else lookup the *uid details
623 * using Get_Pwnam_alloc(). See bug #6291 for details. JRA.
624 */
625
626 /* We must always assign the *uid. */
627 if (sam_acct->unix_pw == NULL) {
628 struct passwd *pwd = Get_Pwnam_alloc(sam_acct, *found_username );
629 if (!pwd) {
630 DEBUG(10, ("Get_Pwnam_alloc failed for %s\n",
631 *found_username));
632 result = NT_STATUS_NO_SUCH_USER;
633 goto done;
634 }
635 result = samu_set_unix(sam_acct, pwd );
636 if (!NT_STATUS_IS_OK(result)) {
637 DEBUG(10, ("samu_set_unix failed for %s\n",
638 *found_username));
639 result = NT_STATUS_NO_SUCH_USER;
640 goto done;
641 }
642 }
643 *uid = sam_acct->unix_pw->pw_uid;
644
645 } else if (sid_check_is_in_unix_users(user_sid)) {
646 struct dom_sid tmp_sid;
647 uint32_t getgroups_num_group_sids;
648 /* This is a unix user not in passdb. We need to ask nss
649 * directly, without consulting passdb */
650
651 struct passwd *pass;
652
653 /*
654 * This goto target is used as a fallback for the passdb
655 * case. The concrete bug report is when passdb gave us an
656 * unmapped gid.
657 */
658
659 unix_user:
660
661 if (!sid_to_uid(user_sid, uid)) {
662 DEBUG(1, ("unix_user case, sid_to_uid for %s failed\n",
663 sid_string_dbg(user_sid)));
664 result = NT_STATUS_NO_SUCH_USER;
665 goto done;
666 }
667
668 uid_to_unix_users_sid(*uid, &tmp_sid);
669 user_sid = &tmp_sid;
670
671 pass = getpwuid_alloc(tmp_ctx, *uid);
672 if (pass == NULL) {
673 DEBUG(1, ("getpwuid(%u) failed\n",
674 (unsigned int)*uid));
675 goto done;
676 }
677
678 if (!getgroups_unix_user(tmp_ctx, pass->pw_name, pass->pw_gid,
679 &gids, &getgroups_num_group_sids)) {
680 DEBUG(1, ("getgroups_unix_user for user %s failed\n",
681 pass->pw_name));
682 goto done;
683 }
684 num_group_sids = getgroups_num_group_sids;
685
686 if (num_group_sids) {
687 group_sids = talloc_array(tmp_ctx, struct dom_sid, num_group_sids);
688 if (group_sids == NULL) {
689 DEBUG(1, ("talloc_array failed\n"));
690 result = NT_STATUS_NO_MEMORY;
691 goto done;
692 }
693 } else {
694 group_sids = NULL;
695 }
696
697 for (i=0; i<num_group_sids; i++) {
698 gid_to_sid(&group_sids[i], gids[i]);
699 }
700
701 /* In getgroups_unix_user we always set the primary gid */
702 SMB_ASSERT(num_group_sids > 0);
703
704 *gid = gids[0];
705
706 /* Ensure we're returning the found_username on the right context. */
707 *found_username = talloc_strdup(mem_ctx, pass->pw_name);
708 if (*found_username == NULL) {
709 result = NT_STATUS_NO_MEMORY;
710 goto done;
711 }
712 } else {
713
714 /* This user is from winbind, force the primary gid to the
715 * user's "domain users" group. Under certain circumstances
716 * (user comes from NT4), this might be a loss of
717 * information. But we can not rely on winbind getting the
718 * correct info. AD might prohibit winbind looking up that
719 * information. */
720
721 /* We must always assign the *uid. */
722 if (!sid_to_uid(user_sid, uid)) {
723 DEBUG(1, ("winbindd case, sid_to_uid for %s failed\n",
724 sid_string_dbg(user_sid)));
725 result = NT_STATUS_NO_SUCH_USER;
726 goto done;
727 }
728
729 num_group_sids = 1;
730 group_sids = talloc_array(tmp_ctx, struct dom_sid, num_group_sids);
731 if (group_sids == NULL) {
732 DEBUG(1, ("talloc_array failed\n"));
733 result = NT_STATUS_NO_MEMORY;
734 goto done;
735 }
736
737 sid_copy(&group_sids[0], user_sid);
738 sid_split_rid(&group_sids[0], NULL);
739 sid_append_rid(&group_sids[0], DOMAIN_RID_USERS);
740
741 if (!sid_to_gid(&group_sids[0], gid)) {
742 DEBUG(1, ("sid_to_gid(%s) failed\n",
743 sid_string_dbg(&group_sids[0])));
744 goto done;
745 }
746
747 gids = gid;
748
749 *found_username = NULL;
750 }
751
752 /* Add the "Unix Group" SID for each gid to catch mapped groups
753 and their Unix equivalent. This is to solve the backwards
754 compatibility problem of 'valid users = +ntadmin' where
755 ntadmin has been paired with "Domain Admins" in the group
756 mapping table. Otherwise smb.conf would need to be changed
757 to 'valid user = "Domain Admins"'. --jerry */
758
759 num_gids = num_group_sids;
760 for ( i=0; i<num_gids; i++ ) {
761 gid_t high, low;
762
763 /* don't pickup anything managed by Winbind */
764
765 if ( lp_idmap_gid(&low, &high) && (gids[i] >= low) && (gids[i] <= high) )
766 continue;
767
768 gid_to_unix_groups_sid(gids[i], &unix_group_sid);
769
770 result = add_sid_to_array_unique(tmp_ctx, &unix_group_sid,
771 &group_sids, &num_group_sids);
772 if (!NT_STATUS_IS_OK(result)) {
773 goto done;
774 }
775 }
776
777 /* Ensure we're creating the nt_token on the right context. */
778 *token = create_local_nt_token(mem_ctx, user_sid,
779 is_guest, num_group_sids, group_sids);
780
781 if (*token == NULL) {
782 result = NT_STATUS_NO_MEMORY;
783 goto done;
784 }
785
786 result = NT_STATUS_OK;
787 done:
788 TALLOC_FREE(tmp_ctx);
789 return result;
790 }
791
792 /*
793 * Create an artificial NT token given just a username. (Initially intended
794 * for force user)
795 *
796 * We go through lookup_name() to avoid problems we had with 'winbind use
797 * default domain'.
798 *
799 * We have 3 cases:
800 *
801 * unmapped unix users: Go directly to nss to find the user's group.
802 *
803 * A passdb user: The list of groups is provided by pdb_enum_group_memberships.
804 *
805 * If the user is provided by winbind, the primary gid is set to "domain
806 * users" of the user's domain. For an explanation why this is necessary, see
807 * the thread starting at
808 * http://lists.samba.org/archive/samba-technical/2006-January/044803.html.
809 */
810
811 NTSTATUS create_token_from_username(TALLOC_CTX *mem_ctx, const char *username,
812 bool is_guest,
813 uid_t *uid, gid_t *gid,
814 char **found_username,
815 struct security_token **token)
816 {
817 NTSTATUS result = NT_STATUS_NO_SUCH_USER;
818 TALLOC_CTX *tmp_ctx = talloc_stackframe();
819 struct dom_sid user_sid;
820 enum lsa_SidType type;
821
822 if (!lookup_name_smbconf(tmp_ctx, username, LOOKUP_NAME_ALL,
823 NULL, NULL, &user_sid, &type)) {
824 DEBUG(1, ("lookup_name_smbconf for %s failed\n", username));
825 goto done;
826 }
827
828 if (type != SID_NAME_USER) {
829 DEBUG(1, ("%s is a %s, not a user\n", username,
830 sid_type_lookup(type)));
831 goto done;
832 }
833
834 result = create_token_from_sid(mem_ctx, &user_sid, is_guest, uid, gid, found_username, token);
835
836 if (!NT_STATUS_IS_OK(result)) {
837 goto done;
838 }
839
840 /*
841 * If result == NT_STATUS_OK then
842 * we know we have a valid token. Ensure
843 * we also have a valid username to match.
844 */
845
846 if (*found_username == NULL) {
847 *found_username = talloc_strdup(mem_ctx, username);
848 if (*found_username == NULL) {
849 result = NT_STATUS_NO_MEMORY;
850 }
851 }
852
853 done:
854 TALLOC_FREE(tmp_ctx);
855 return result;
856 }
857
858 /***************************************************************************
859 Build upon create_token_from_sid:
860
861 Expensive helper function to figure out whether a user given its sid is
862 member of a particular group.
863 ***************************************************************************/
864
865 bool user_sid_in_group_sid(const struct dom_sid *sid, const struct dom_sid *group_sid)
866 {
867 NTSTATUS status;
868 uid_t uid;
869 gid_t gid;
870 char *found_username;
871 struct security_token *token;
872 bool result = false;
873 enum lsa_SidType type;
874 TALLOC_CTX *mem_ctx = talloc_stackframe();
875
876 if (!lookup_sid(mem_ctx, sid,
877 NULL, NULL, &type)) {
878 DEBUG(1, ("lookup_sid for %s failed\n", dom_sid_string(mem_ctx, sid)));
879 goto done;
880 }
881
882 if (type != SID_NAME_USER) {
883 DEBUG(5, ("%s is a %s, not a user\n", dom_sid_string(mem_ctx, sid),
884 sid_type_lookup(type)));
885 goto done;
886 }
887
888 status = create_token_from_sid(mem_ctx, sid, False,
889 &uid, &gid, &found_username,
890 &token);
891
892 if (!NT_STATUS_IS_OK(status)) {
893 DEBUG(10, ("could not create token for %s\n", dom_sid_string(mem_ctx, sid)));
894 goto done;
895 }
896
897 result = security_token_has_sid(token, group_sid);
898
899 done:
900 TALLOC_FREE(mem_ctx);
901 return result;
902 }
903
904 /***************************************************************************
905 Build upon create_token_from_username:
906
907 Expensive helper function to figure out whether a user given its name is
908 member of a particular group.
909 ***************************************************************************/
910
911 bool user_in_group_sid(const char *username, const struct dom_sid *group_sid)
912 {
913 NTSTATUS status;
914 uid_t uid;
915 gid_t gid;
916 char *found_username;
917 struct security_token *token;
918 bool result;
919 TALLOC_CTX *mem_ctx = talloc_stackframe();
920
921 status = create_token_from_username(mem_ctx, username, False,
922 &uid, &gid, &found_username,
923 &token);
924
925 if (!NT_STATUS_IS_OK(status)) {
926 DEBUG(10, ("could not create token for %s\n", username));
927 TALLOC_FREE(mem_ctx);
928 return False;
929 }
930
931 result = security_token_has_sid(token, group_sid);
932
933 TALLOC_FREE(mem_ctx);
934 return result;
935 }
936
937 bool user_in_group(const char *username, const char *groupname)
938 {
939 TALLOC_CTX *mem_ctx = talloc_stackframe();
940 struct dom_sid group_sid;
941 bool ret;
942
943 ret = lookup_name(mem_ctx, groupname, LOOKUP_NAME_ALL,
944 NULL, NULL, &group_sid, NULL);
945 TALLOC_FREE(mem_ctx);
946
947 if (!ret) {
948 DEBUG(10, ("lookup_name for (%s) failed.\n", groupname));
949 return False;
950 }
951
952 return user_in_group_sid(username, &group_sid);
953 }
954
955 /* END */