source: branches/samba-3.3.x/source/auth/token_util.c

Last change on this file was 206, checked in by Herwig Bauernfeind, 16 years ago

Import Samba 3.3 branch at 3.0.0 level (psmedley's port)
File size: 14.5 KB
Line 
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
33bool 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
48bool 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
78NT_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("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_getpwnam( "root" )) ) {
95 DEBUG(0,("get_root_nt_token: getpwnam(\"root\") 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("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
124NTSTATUS 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
162done:
163 TALLOC_FREE(tmp_ctx);
164 return NT_STATUS_OK;
165}
166
167/*******************************************************************
168*******************************************************************/
169
170static 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 */
212static 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 */
238static 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
267NTSTATUS 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
292NTSTATUS 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
340struct 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
517void 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
543void 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 */
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