source: branches/samba-3.5.x/source3/auth/token_util.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 14.6 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_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 if ( !(pw = sys_getpwnam("root")) ) {
96 DEBUG(0,("get_root_nt_token: both sys_getpwuid(0) "
97 "and sys_getpwnam(\"root\") failed!\n"));
98 return NULL;
99 }
100 }
101
102 /* get the user and primary group SIDs; although the
103 BUILTIN\Administrators SId is really the one that matters here */
104
105 uid_to_sid(&u_sid, pw->pw_uid);
106 gid_to_sid(&g_sid, pw->pw_gid);
107
108 token = create_local_nt_token(talloc_autofree_context(), &u_sid, False,
109 1, &global_sid_Builtin_Administrators);
110
111 token->privileges = se_disk_operators;
112
113 for_cache = token;
114
115 memcache_add_talloc(
116 NULL, SINGLETON_CACHE_TALLOC,
117 data_blob_string_const_null("root_nt_token"), &for_cache);
118
119 return token;
120}
121
122
123/*
124 * Add alias SIDs from memberships within the partially created token SID list
125 */
126
127NTSTATUS add_aliases(const DOM_SID *domain_sid,
128 struct nt_user_token *token)
129{
130 uint32 *aliases;
131 size_t i, num_aliases;
132 NTSTATUS status;
133 TALLOC_CTX *tmp_ctx;
134
135 if (!(tmp_ctx = talloc_init("add_aliases"))) {
136 return NT_STATUS_NO_MEMORY;
137 }
138
139 aliases = NULL;
140 num_aliases = 0;
141
142 status = pdb_enum_alias_memberships(tmp_ctx, domain_sid,
143 token->user_sids,
144 token->num_sids,
145 &aliases, &num_aliases);
146
147 if (!NT_STATUS_IS_OK(status)) {
148 DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n",
149 nt_errstr(status)));
150 goto done;
151 }
152
153 for (i=0; i<num_aliases; i++) {
154 DOM_SID alias_sid;
155 sid_compose(&alias_sid, domain_sid, aliases[i]);
156 status = add_sid_to_array_unique(token, &alias_sid,
157 &token->user_sids,
158 &token->num_sids);
159 if (!NT_STATUS_IS_OK(status)) {
160 DEBUG(0, ("add_sid_to_array failed\n"));
161 goto done;
162 }
163 }
164
165done:
166 TALLOC_FREE(tmp_ctx);
167 return NT_STATUS_OK;
168}
169
170/*******************************************************************
171*******************************************************************/
172
173static NTSTATUS add_builtin_administrators(struct nt_user_token *token,
174 const DOM_SID *dom_sid)
175{
176 DOM_SID domadm;
177 NTSTATUS status;
178
179 /* nothing to do if we aren't in a domain */
180
181 if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) {
182 return NT_STATUS_OK;
183 }
184
185 /* Find the Domain Admins SID */
186
187 if ( IS_DC ) {
188 sid_copy( &domadm, get_global_sam_sid() );
189 } else {
190 sid_copy(&domadm, dom_sid);
191 }
192 sid_append_rid( &domadm, DOMAIN_GROUP_RID_ADMINS );
193
194 /* Add Administrators if the user beloongs to Domain Admins */
195
196 if ( nt_token_check_sid( &domadm, token ) ) {
197 status = add_sid_to_array(token,
198 &global_sid_Builtin_Administrators,
199 &token->user_sids, &token->num_sids);
200 if (!NT_STATUS_IS_OK(status)) {
201 return status;
202 }
203 }
204
205 return NT_STATUS_OK;
206}
207
208/**
209 * Create the requested BUILTIN if it doesn't already exist. This requires
210 * winbindd to be running.
211 *
212 * @param[in] rid BUILTIN rid to create
213 * @return Normal NTSTATUS return.
214 */
215static NTSTATUS create_builtin(uint32 rid)
216{
217 NTSTATUS status = NT_STATUS_OK;
218 DOM_SID sid;
219 gid_t gid;
220
221 if (!sid_compose(&sid, &global_sid_Builtin, rid)) {
222 return NT_STATUS_NO_SUCH_ALIAS;
223 }
224
225 if (!sid_to_gid(&sid, &gid)) {
226 if (!lp_winbind_nested_groups() || !winbind_ping()) {
227 return NT_STATUS_PROTOCOL_UNREACHABLE;
228 }
229 status = pdb_create_builtin_alias(rid);
230 }
231 return status;
232}
233
234/**
235 * Add sid as a member of builtin_sid.
236 *
237 * @param[in] builtin_sid An existing builtin group.
238 * @param[in] dom_sid sid to add as a member of builtin_sid.
239 * @return Normal NTSTATUS return
240 */
241static NTSTATUS add_sid_to_builtin(const DOM_SID *builtin_sid,
242 const DOM_SID *dom_sid)
243{
244 NTSTATUS status = NT_STATUS_OK;
245
246 if (!dom_sid || !builtin_sid) {
247 return NT_STATUS_INVALID_PARAMETER;
248 }
249
250 status = pdb_add_aliasmem(builtin_sid, dom_sid);
251
252 if (NT_STATUS_EQUAL(status, NT_STATUS_MEMBER_IN_ALIAS)) {
253 DEBUG(5, ("add_sid_to_builtin %s is already a member of %s\n",
254 sid_string_dbg(dom_sid),
255 sid_string_dbg(builtin_sid)));
256 return NT_STATUS_OK;
257 }
258
259 if (!NT_STATUS_IS_OK(status)) {
260 DEBUG(4, ("add_sid_to_builtin %s could not be added to %s: "
261 "%s\n", sid_string_dbg(dom_sid),
262 sid_string_dbg(builtin_sid), nt_errstr(status)));
263 }
264 return status;
265}
266
267/*******************************************************************
268*******************************************************************/
269
270NTSTATUS create_builtin_users(const DOM_SID *dom_sid)
271{
272 NTSTATUS status;
273 DOM_SID dom_users;
274
275 status = create_builtin(BUILTIN_ALIAS_RID_USERS);
276 if ( !NT_STATUS_IS_OK(status) ) {
277 DEBUG(5,("create_builtin_users: Failed to create Users\n"));
278 return status;
279 }
280
281 /* add domain users */
282 if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
283 && sid_compose(&dom_users, dom_sid, DOMAIN_GROUP_RID_USERS))
284 {
285 status = add_sid_to_builtin(&global_sid_Builtin_Users,
286 &dom_users);
287 }
288
289 return status;
290}
291
292/*******************************************************************
293*******************************************************************/
294
295NTSTATUS create_builtin_administrators(const DOM_SID *dom_sid)
296{
297 NTSTATUS status;
298 DOM_SID dom_admins, root_sid;
299 fstring root_name;
300 enum lsa_SidType type;
301 TALLOC_CTX *ctx;
302 bool ret;
303
304 status = create_builtin(BUILTIN_ALIAS_RID_ADMINS);
305 if ( !NT_STATUS_IS_OK(status) ) {
306 DEBUG(5,("create_builtin_administrators: Failed to create Administrators\n"));
307 return status;
308 }
309
310 /* add domain admins */
311 if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
312 && sid_compose(&dom_admins, dom_sid, DOMAIN_GROUP_RID_ADMINS))
313 {
314 status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
315 &dom_admins);
316 if (!NT_STATUS_IS_OK(status)) {
317 return status;
318 }
319 }
320
321 /* add root */
322 if ( (ctx = talloc_init("create_builtin_administrators")) == NULL ) {
323 return NT_STATUS_NO_MEMORY;
324 }
325 fstr_sprintf( root_name, "%s\\root", get_global_sam_name() );
326 ret = lookup_name(ctx, root_name, LOOKUP_NAME_DOMAIN, NULL, NULL,
327 &root_sid, &type);
328 TALLOC_FREE( ctx );
329
330 if ( ret ) {
331 status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
332 &root_sid);
333 }
334
335 return status;
336}
337
338
339/*******************************************************************
340 Create a NT token for the user, expanding local aliases
341*******************************************************************/
342
343struct nt_user_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
344 const DOM_SID *user_sid,
345 bool is_guest,
346 int num_groupsids,
347 const DOM_SID *groupsids)
348{
349 struct nt_user_token *result = NULL;
350 int i;
351 NTSTATUS status;
352 gid_t gid;
353 DOM_SID dom_sid;
354
355 DEBUG(10, ("Create local NT token for %s\n",
356 sid_string_dbg(user_sid)));
357
358 if (!(result = TALLOC_ZERO_P(mem_ctx, struct nt_user_token))) {
359 DEBUG(0, ("talloc failed\n"));
360 return NULL;
361 }
362
363 /* Add the user and primary group sid */
364
365 status = add_sid_to_array(result, user_sid,
366 &result->user_sids, &result->num_sids);
367 if (!NT_STATUS_IS_OK(status)) {
368 return NULL;
369 }
370
371 /* For guest, num_groupsids may be zero. */
372 if (num_groupsids) {
373 status = add_sid_to_array(result, &groupsids[0],
374 &result->user_sids,
375 &result->num_sids);
376 if (!NT_STATUS_IS_OK(status)) {
377 return NULL;
378 }
379 }
380
381 /* Add in BUILTIN sids */
382
383 status = add_sid_to_array(result, &global_sid_World,
384 &result->user_sids, &result->num_sids);
385 if (!NT_STATUS_IS_OK(status)) {
386 return NULL;
387 }
388 status = add_sid_to_array(result, &global_sid_Network,
389 &result->user_sids, &result->num_sids);
390 if (!NT_STATUS_IS_OK(status)) {
391 return NULL;
392 }
393
394 if (is_guest) {
395 status = add_sid_to_array(result, &global_sid_Builtin_Guests,
396 &result->user_sids,
397 &result->num_sids);
398 if (!NT_STATUS_IS_OK(status)) {
399 return NULL;
400 }
401 } else {
402 status = add_sid_to_array(result,
403 &global_sid_Authenticated_Users,
404 &result->user_sids,
405 &result->num_sids);
406 if (!NT_STATUS_IS_OK(status)) {
407 return NULL;
408 }
409 }
410
411 /* Now the SIDs we got from authentication. These are the ones from
412 * the info3 struct or from the pdb_enum_group_memberships, depending
413 * on who authenticated the user.
414 * Note that we start the for loop at "1" here, we already added the
415 * first group sid as primary above. */
416
417 for (i=1; i<num_groupsids; i++) {
418 status = add_sid_to_array_unique(result, &groupsids[i],
419 &result->user_sids,
420 &result->num_sids);
421 if (!NT_STATUS_IS_OK(status)) {
422 return NULL;
423 }
424 }
425
426 /* Deal with the BUILTIN\Administrators group. If the SID can
427 be resolved then assume that the add_aliasmem( S-1-5-32 )
428 handled it. */
429
430 if (!sid_to_gid(&global_sid_Builtin_Administrators, &gid)) {
431
432 become_root();
433 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
434 status = NT_STATUS_OK;
435 DEBUG(3, ("Failed to fetch domain sid for %s\n",
436 lp_workgroup()));
437 } else {
438 status = create_builtin_administrators(&dom_sid);
439 }
440 unbecome_root();
441
442 if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) {
443 /* Add BUILTIN\Administrators directly to token. */
444 status = add_builtin_administrators(result, &dom_sid);
445 if ( !NT_STATUS_IS_OK(status) ) {
446 DEBUG(3, ("Failed to check for local "
447 "Administrators membership (%s)\n",
448 nt_errstr(status)));
449 }
450 } else if (!NT_STATUS_IS_OK(status)) {
451 DEBUG(2, ("WARNING: Failed to create "
452 "BUILTIN\\Administrators group! Can "
453 "Winbind allocate gids?\n"));
454 }
455 }
456
457 /* Deal with the BUILTIN\Users group. If the SID can
458 be resolved then assume that the add_aliasmem( S-1-5-32 )
459 handled it. */
460
461 if (!sid_to_gid(&global_sid_Builtin_Users, &gid)) {
462
463 become_root();
464 if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
465 status = NT_STATUS_OK;
466 DEBUG(3, ("Failed to fetch domain sid for %s\n",
467 lp_workgroup()));
468 } else {
469 status = create_builtin_users(&dom_sid);
470 }
471 unbecome_root();
472
473 if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) &&
474 !NT_STATUS_IS_OK(status))
475 {
476 DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! "
477 "Can Winbind allocate gids?\n"));
478 }
479 }
480
481 /* Deal with local groups */
482
483 if (lp_winbind_nested_groups()) {
484
485 become_root();
486
487 /* Now add the aliases. First the one from our local SAM */
488
489 status = add_aliases(get_global_sam_sid(), result);
490
491 if (!NT_STATUS_IS_OK(status)) {
492 unbecome_root();
493 TALLOC_FREE(result);
494 return NULL;
495 }
496
497 /* Finally the builtin ones */
498
499 status = add_aliases(&global_sid_Builtin, result);
500
501 if (!NT_STATUS_IS_OK(status)) {
502 unbecome_root();
503 TALLOC_FREE(result);
504 return NULL;
505 }
506
507 unbecome_root();
508 }
509
510
511 get_privileges_for_sids(&result->privileges, result->user_sids,
512 result->num_sids);
513 return result;
514}
515
516/****************************************************************************
517 prints a NT_USER_TOKEN to debug output.
518****************************************************************************/
519
520void debug_nt_user_token(int dbg_class, int dbg_lev, NT_USER_TOKEN *token)
521{
522 size_t i;
523
524 if (!token) {
525 DEBUGC(dbg_class, dbg_lev, ("NT user token: (NULL)\n"));
526 return;
527 }
528
529 DEBUGC(dbg_class, dbg_lev,
530 ("NT user token of user %s\n",
531 sid_string_dbg(&token->user_sids[0]) ));
532 DEBUGADDC(dbg_class, dbg_lev,
533 ("contains %lu SIDs\n", (unsigned long)token->num_sids));
534 for (i = 0; i < token->num_sids; i++)
535 DEBUGADDC(dbg_class, dbg_lev,
536 ("SID[%3lu]: %s\n", (unsigned long)i,
537 sid_string_dbg(&token->user_sids[i])));
538
539 dump_se_priv( dbg_class, dbg_lev, &token->privileges );
540}
541
542/****************************************************************************
543 prints a UNIX 'token' to debug output.
544****************************************************************************/
545
546void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
547 int n_groups, gid_t *groups)
548{
549 int i;
550 DEBUGC(dbg_class, dbg_lev,
551 ("UNIX token of user %ld\n", (long int)uid));
552
553 DEBUGADDC(dbg_class, dbg_lev,
554 ("Primary group is %ld and contains %i supplementary "
555 "groups\n", (long int)gid, n_groups));
556 for (i = 0; i < n_groups; i++)
557 DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
558 (long int)groups[i]));
559}
560
561/* END */
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