8e8e604702adadf5804045cde4b5ffcabcf47314
[ira/wip.git] / source3 / auth / token_util.c
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
29 /****************************************************************************
30  Check for a SID in an NT_USER_TOKEN
31 ****************************************************************************/
32
33 bool nt_token_check_sid ( const DOM_SID *sid, const NT_USER_TOKEN *token )
34 {
35         int i;
36
37         if ( !sid || !token )
38                 return False;
39
40         for ( i=0; i<token->num_sids; i++ ) {
41                 if ( sid_equal( sid, &token->user_sids[i] ) )
42                         return True;
43         }
44
45         return False;
46 }
47
48 bool nt_token_check_domain_rid( NT_USER_TOKEN *token, uint32 rid )
49 {
50         DOM_SID domain_sid;
51
52         /* if we are a domain member, the get the domain SID, else for
53            a DC or standalone server, use our own SID */
54
55         if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
56                 if ( !secrets_fetch_domain_sid( lp_workgroup(),
57                                                 &domain_sid ) ) {
58                         DEBUG(1,("nt_token_check_domain_rid: Cannot lookup "
59                                  "SID for domain [%s]\n", lp_workgroup()));
60                         return False;
61                 }
62         }
63         else
64                 sid_copy( &domain_sid, get_global_sam_sid() );
65
66         sid_append_rid( &domain_sid, rid );
67
68         return nt_token_check_sid( &domain_sid, token );\
69 }
70
71 /******************************************************************************
72  Create a token for the root user to be used internally by smbd.
73  This is similar to running under the context of the LOCAL_SYSTEM account
74  in Windows.  This is a read-only token.  Do not modify it or free() it.
75  Create a copy if your need to change it.
76 ******************************************************************************/
77
78 NT_USER_TOKEN *get_root_nt_token( void )
79 {
80         struct nt_user_token *token, *for_cache;
81         DOM_SID u_sid, g_sid;
82         struct passwd *pw;
83         void *cache_data;
84
85         cache_data = memcache_lookup_talloc(
86                 NULL, SINGLETON_CACHE_TALLOC,
87                 data_blob_string_const_null("root_nt_token"));
88
89         if (cache_data != NULL) {
90                 return talloc_get_type_abort(
91                         cache_data, struct nt_user_token);
92         }
93
94         if ( !(pw = sys_getpwuid(0)) ) {
95                 DEBUG(0,("get_root_nt_token: sys_getpwuid(0) failed!\n"));
96                 return NULL;
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_autofree_context(), &u_sid, False,
106                                       1, &global_sid_Builtin_Administrators);
107
108         token->privileges = se_disk_operators;
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 DOM_SID *domain_sid,
125                      struct nt_user_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->user_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                 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->user_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 nt_user_token *token,
171                                            const DOM_SID *dom_sid)
172 {
173         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_GROUP_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->user_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         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 DOM_SID *builtin_sid,
239                                    const 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 DOM_SID *dom_sid)
268 {
269         NTSTATUS status;
270         DOM_SID dom_users;
271
272         status = create_builtin(BUILTIN_ALIAS_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_GROUP_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 DOM_SID *dom_sid)
293 {
294         NTSTATUS status;
295         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_ALIAS_RID_ADMINS);
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_GROUP_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
336 /*******************************************************************
337  Create a NT token for the user, expanding local aliases
338 *******************************************************************/
339
340 struct nt_user_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
341                                             const DOM_SID *user_sid,
342                                             bool is_guest,
343                                             int num_groupsids,
344                                             const DOM_SID *groupsids)
345 {
346         struct nt_user_token *result = NULL;
347         int i;
348         NTSTATUS status;
349         gid_t gid;
350         DOM_SID dom_sid;
351
352         DEBUG(10, ("Create local NT token for %s\n",
353                    sid_string_dbg(user_sid)));
354
355         if (!(result = TALLOC_ZERO_P(mem_ctx, struct nt_user_token))) {
356                 DEBUG(0, ("talloc failed\n"));
357                 return NULL;
358         }
359
360         /* Add the user and primary group sid */
361
362         status = add_sid_to_array(result, user_sid,
363                                   &result->user_sids, &result->num_sids);
364         if (!NT_STATUS_IS_OK(status)) {
365                 return NULL;
366         }
367
368         /* For guest, num_groupsids may be zero. */
369         if (num_groupsids) {
370                 status = add_sid_to_array(result, &groupsids[0],
371                                           &result->user_sids,
372                                           &result->num_sids);
373                 if (!NT_STATUS_IS_OK(status)) {
374                         return NULL;
375                 }
376         }
377
378         /* Add in BUILTIN sids */
379
380         status = add_sid_to_array(result, &global_sid_World,
381                                   &result->user_sids, &result->num_sids);
382         if (!NT_STATUS_IS_OK(status)) {
383                 return NULL;
384         }
385         status = add_sid_to_array(result, &global_sid_Network,
386                                   &result->user_sids, &result->num_sids);
387         if (!NT_STATUS_IS_OK(status)) {
388                 return NULL;
389         }
390
391         if (is_guest) {
392                 status = add_sid_to_array(result, &global_sid_Builtin_Guests,
393                                           &result->user_sids,
394                                           &result->num_sids);
395                 if (!NT_STATUS_IS_OK(status)) {
396                         return NULL;
397                 }
398         } else {
399                 status = add_sid_to_array(result,
400                                           &global_sid_Authenticated_Users,
401                                           &result->user_sids,
402                                           &result->num_sids);
403                 if (!NT_STATUS_IS_OK(status)) {
404                         return NULL;
405                 }
406         }
407
408         /* Now the SIDs we got from authentication. These are the ones from
409          * the info3 struct or from the pdb_enum_group_memberships, depending
410          * on who authenticated the user.
411          * Note that we start the for loop at "1" here, we already added the
412          * first group sid as primary above. */
413
414         for (i=1; i<num_groupsids; i++) {
415                 status = add_sid_to_array_unique(result, &groupsids[i],
416                                                  &result->user_sids,
417                                                  &result->num_sids);
418                 if (!NT_STATUS_IS_OK(status)) {
419                         return NULL;
420                 }
421         }
422
423         /* Deal with the BUILTIN\Administrators group.  If the SID can
424            be resolved then assume that the add_aliasmem( S-1-5-32 )
425            handled it. */
426
427         if (!sid_to_gid(&global_sid_Builtin_Administrators, &gid)) {
428
429                 become_root();
430                 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
431                         status = NT_STATUS_OK;
432                         DEBUG(3, ("Failed to fetch domain sid for %s\n",
433                                   lp_workgroup()));
434                 } else {
435                         status = create_builtin_administrators(&dom_sid);
436                 }
437                 unbecome_root();
438
439                 if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) {
440                         /* Add BUILTIN\Administrators directly to token. */
441                         status = add_builtin_administrators(result, &dom_sid);
442                         if ( !NT_STATUS_IS_OK(status) ) {
443                                 DEBUG(3, ("Failed to check for local "
444                                           "Administrators membership (%s)\n",
445                                           nt_errstr(status)));
446                         }
447                 } else if (!NT_STATUS_IS_OK(status)) {
448                         DEBUG(2, ("WARNING: Failed to create "
449                                   "BUILTIN\\Administrators group!  Can "
450                                   "Winbind allocate gids?\n"));
451                 }
452         }
453
454         /* Deal with the BUILTIN\Users group.  If the SID can
455            be resolved then assume that the add_aliasmem( S-1-5-32 )
456            handled it. */
457
458         if (!sid_to_gid(&global_sid_Builtin_Users, &gid)) {
459
460                 become_root();
461                 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
462                         status = NT_STATUS_OK;
463                         DEBUG(3, ("Failed to fetch domain sid for %s\n",
464                                   lp_workgroup()));
465                 } else {
466                         status = create_builtin_users(&dom_sid);
467                 }
468                 unbecome_root();
469
470                 if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) &&
471                     !NT_STATUS_IS_OK(status))
472                 {
473                         DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! "
474                                   "Can Winbind allocate gids?\n"));
475                 }
476         }
477
478         /* Deal with local groups */
479
480         if (lp_winbind_nested_groups()) {
481
482                 become_root();
483
484                 /* Now add the aliases. First the one from our local SAM */
485
486                 status = add_aliases(get_global_sam_sid(), result);
487
488                 if (!NT_STATUS_IS_OK(status)) {
489                         unbecome_root();
490                         TALLOC_FREE(result);
491                         return NULL;
492                 }
493
494                 /* Finally the builtin ones */
495
496                 status = add_aliases(&global_sid_Builtin, result);
497
498                 if (!NT_STATUS_IS_OK(status)) {
499                         unbecome_root();
500                         TALLOC_FREE(result);
501                         return NULL;
502                 }
503
504                 unbecome_root();
505         }
506
507
508         get_privileges_for_sids(&result->privileges, result->user_sids,
509                                 result->num_sids);
510         return result;
511 }
512
513 /****************************************************************************
514  prints a NT_USER_TOKEN to debug output.
515 ****************************************************************************/
516
517 void debug_nt_user_token(int dbg_class, int dbg_lev, NT_USER_TOKEN *token)
518 {
519         size_t     i;
520
521         if (!token) {
522                 DEBUGC(dbg_class, dbg_lev, ("NT user token: (NULL)\n"));
523                 return;
524         }
525
526         DEBUGC(dbg_class, dbg_lev,
527                ("NT user token of user %s\n",
528                 sid_string_dbg(&token->user_sids[0]) ));
529         DEBUGADDC(dbg_class, dbg_lev,
530                   ("contains %lu SIDs\n", (unsigned long)token->num_sids));
531         for (i = 0; i < token->num_sids; i++)
532                 DEBUGADDC(dbg_class, dbg_lev,
533                           ("SID[%3lu]: %s\n", (unsigned long)i,
534                            sid_string_dbg(&token->user_sids[i])));
535
536         dump_se_priv( dbg_class, dbg_lev, &token->privileges );
537 }
538
539 /****************************************************************************
540  prints a UNIX 'token' to debug output.
541 ****************************************************************************/
542
543 void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
544                            int n_groups, gid_t *groups)
545 {
546         int     i;
547         DEBUGC(dbg_class, dbg_lev,
548                ("UNIX token of user %ld\n", (long int)uid));
549
550         DEBUGADDC(dbg_class, dbg_lev,
551                   ("Primary group is %ld and contains %i supplementary "
552                    "groups\n", (long int)gid, n_groups));
553         for (i = 0; i < n_groups; i++)
554                 DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
555                         (long int)groups[i]));
556 }
557
558 /* END */