source: vendor/current/source3/lib/privileges.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 13.2 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Privileges handling functions
4 Copyright (C) Jean François Micouleau 1998-2001
5 Copyright (C) Simo Sorce 2002-2003
6 Copyright (C) Gerald (Jerry) Carter 2005
7 Copyright (C) Michael Adam 2007
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21*/
22
23
24#include "includes.h"
25#include "lib/privileges.h"
26#include "dbwrap/dbwrap.h"
27#include "libcli/security/privileges_private.h"
28#include "../libcli/security/security.h"
29#include "passdb.h"
30
31#define PRIVPREFIX "PRIV_"
32
33typedef struct {
34 uint32_t count;
35 struct dom_sid *list;
36} SID_LIST;
37
38typedef struct {
39 TALLOC_CTX *mem_ctx;
40 uint64_t privilege;
41 SID_LIST sids;
42} PRIV_SID_LIST;
43
44/*
45 interpret an old style SE_PRIV structure
46 */
47static uint64_t map_old_SE_PRIV(unsigned char *dptr)
48{
49 uint32_t *old_masks = (uint32_t *)dptr;
50 /*
51 * the old privileges code only ever used up to 0x800, except
52 * for a special case of 'SE_ALL_PRIVS' which was 0xFFFFFFFF
53 */
54 if (old_masks[0] == 0xFFFFFFFF) {
55 /* they set all privileges */
56 return SE_ALL_PRIVS;
57 }
58
59 /* the old code used the machine byte order, but we don't know
60 * the byte order of the machine that wrote it. However we can
61 * tell what byte order it was by taking advantage of the fact
62 * that it only ever use up to 0x800
63 */
64 if (dptr[0] || dptr[1]) {
65 /* it was little endian */
66 return IVAL(dptr, 0);
67 }
68
69 /* it was either zero or big-endian */
70 return RIVAL(dptr, 0);
71}
72
73
74static bool get_privileges( const struct dom_sid *sid, uint64_t *mask )
75{
76 struct db_context *db = get_account_pol_db();
77 fstring tmp, keystr;
78 TDB_DATA data;
79 NTSTATUS status;
80
81 /* Fail if the admin has not enable privileges */
82
83 if ( !lp_enable_privileges() ) {
84 return False;
85 }
86
87 if ( db == NULL )
88 return False;
89
90 /* PRIV_<SID> (NULL terminated) as the key */
91
92 fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
93
94 status = dbwrap_fetch_bystring(db, talloc_tos(), keystr, &data);
95
96 if (!NT_STATUS_IS_OK(status)) {
97 DEBUG(4, ("get_privileges: No privileges assigned to SID "
98 "[%s]\n", sid_string_dbg(sid)));
99 return False;
100 }
101
102 if (data.dsize == 4*4) {
103 /* it's an old style SE_PRIV structure. */
104 *mask = map_old_SE_PRIV(data.dptr);
105 } else {
106 if (data.dsize != sizeof( uint64_t ) ) {
107 DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
108 "[%s]\n", sid_string_dbg(sid)));
109 return False;
110 }
111
112 *mask = BVAL(data.dptr, 0);
113 }
114
115 TALLOC_FREE(data.dptr);
116
117 return True;
118}
119
120/***************************************************************************
121 Store the privilege mask (set) for a given SID
122****************************************************************************/
123
124static bool set_privileges( const struct dom_sid *sid, uint64_t mask )
125{
126 struct db_context *db = get_account_pol_db();
127 uint8_t privbuf[8];
128 fstring tmp, keystr;
129 TDB_DATA data;
130
131 if ( !lp_enable_privileges() )
132 return False;
133
134 if ( db == NULL )
135 return False;
136
137 if ( !sid || (sid->num_auths == 0) ) {
138 DEBUG(0,("set_privileges: Refusing to store empty SID!\n"));
139 return False;
140 }
141
142 /* PRIV_<SID> (NULL terminated) as the key */
143
144 fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
145
146 /* This writes the 64 bit bitmask out in little endian format */
147 SBVAL(privbuf,0,mask);
148
149 data.dptr = privbuf;
150 data.dsize = sizeof(privbuf);
151
152 return NT_STATUS_IS_OK(dbwrap_store_bystring(db, keystr, data,
153 TDB_REPLACE));
154}
155
156/*********************************************************************
157 get a list of all privileges for all sids in the list
158*********************************************************************/
159
160bool get_privileges_for_sids(uint64_t *privileges, struct dom_sid *slist, int scount)
161{
162 uint64_t mask;
163 int i;
164 bool found = False;
165
166 *privileges = 0;
167
168 for ( i=0; i<scount; i++ ) {
169 /* don't add unless we actually have a privilege assigned */
170
171 if ( !get_privileges( &slist[i], &mask ) )
172 continue;
173
174 DEBUG(5,("get_privileges_for_sids: sid = %s\nPrivilege "
175 "set: 0x%llx\n", sid_string_dbg(&slist[i]),
176 (unsigned long long)mask));
177
178 *privileges |= mask;
179 found = True;
180 }
181
182 return found;
183}
184
185NTSTATUS get_privileges_for_sid_as_set(TALLOC_CTX *mem_ctx, PRIVILEGE_SET **privileges, struct dom_sid *sid)
186{
187 uint64_t mask;
188 if (!get_privileges(sid, &mask)) {
189 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
190 }
191
192 *privileges = talloc_zero(mem_ctx, PRIVILEGE_SET);
193 if (!*privileges) {
194 return NT_STATUS_NO_MEMORY;
195 }
196
197 if (!se_priv_to_privilege_set(*privileges, mask)) {
198 return NT_STATUS_NO_MEMORY;
199 }
200 return NT_STATUS_OK;
201}
202
203/*********************************************************************
204 traversal functions for privilege_enumerate_accounts
205*********************************************************************/
206
207static int priv_traverse_fn(struct db_record *rec, void *state)
208{
209 PRIV_SID_LIST *priv = (PRIV_SID_LIST *)state;
210 int prefixlen = strlen(PRIVPREFIX);
211 struct dom_sid sid;
212 fstring sid_string;
213 TDB_DATA key;
214
215 key = dbwrap_record_get_key(rec);
216
217 /* check we have a PRIV_+SID entry */
218
219 if (strncmp((char *)key.dptr, PRIVPREFIX, prefixlen) != 0)
220 return 0;
221
222 /* check to see if we are looking for a particular privilege */
223
224 fstrcpy( sid_string, (char *)&(key.dptr[strlen(PRIVPREFIX)]) );
225
226 if (priv->privilege != 0) {
227 uint64_t mask;
228 TDB_DATA value;
229
230 value = dbwrap_record_get_value(rec);
231
232 if (value.dsize == 4*4) {
233 mask = map_old_SE_PRIV(value.dptr);
234 } else {
235 if (value.dsize != sizeof( uint64_t ) ) {
236 DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
237 "[%s]\n", sid_string));
238 return 0;
239 }
240 mask = BVAL(value.dptr, 0);
241 }
242
243 /* if the SID does not have the specified privilege
244 then just return */
245
246 if ((mask & priv->privilege) == 0) {
247 return 0;
248 }
249 }
250
251 /* this is a last ditch safety check to preventing returning
252 and invalid SID (i've somehow run into this on development branches) */
253
254 if ( strcmp( "S-0-0", sid_string ) == 0 )
255 return 0;
256
257 if ( !string_to_sid(&sid, sid_string) ) {
258 DEBUG(0,("travsersal_fn_enum__acct: Could not convert SID [%s]\n",
259 sid_string));
260 return 0;
261 }
262
263 if (!NT_STATUS_IS_OK(add_sid_to_array(priv->mem_ctx, &sid,
264 &priv->sids.list,
265 &priv->sids.count)))
266 {
267 return 0;
268 }
269
270 return 0;
271}
272
273/*********************************************************************
274 Retrieve list of privileged SIDs (for _lsa_enumerate_accounts()
275*********************************************************************/
276
277NTSTATUS privilege_enumerate_accounts(struct dom_sid **sids, int *num_sids)
278{
279 struct db_context *db = get_account_pol_db();
280 PRIV_SID_LIST priv;
281 NTSTATUS status;
282
283 if (db == NULL) {
284 return NT_STATUS_ACCESS_DENIED;
285 }
286
287 ZERO_STRUCT(priv);
288
289 status = dbwrap_traverse_read(db, priv_traverse_fn, &priv, NULL);
290 if (!NT_STATUS_IS_OK(status)) {
291 return status;
292 }
293
294 /* give the memory away; caller will free */
295
296 *sids = priv.sids.list;
297 *num_sids = priv.sids.count;
298
299 return NT_STATUS_OK;
300}
301
302/*********************************************************************
303 Retrieve list of SIDs granted a particular privilege
304*********************************************************************/
305
306NTSTATUS privilege_enum_sids(enum sec_privilege privilege, TALLOC_CTX *mem_ctx,
307 struct dom_sid **sids, int *num_sids)
308{
309 struct db_context *db = get_account_pol_db();
310 PRIV_SID_LIST priv;
311 NTSTATUS status;
312
313 if (db == NULL) {
314 return NT_STATUS_ACCESS_DENIED;
315 }
316
317 ZERO_STRUCT(priv);
318
319 priv.privilege = sec_privilege_mask(privilege);
320 priv.mem_ctx = mem_ctx;
321
322 status = dbwrap_traverse_read(db, priv_traverse_fn, &priv, NULL);
323 if (!NT_STATUS_IS_OK(status)) {
324 return status;
325 }
326
327 /* give the memory away; caller will free */
328
329 *sids = priv.sids.list;
330 *num_sids = priv.sids.count;
331
332 return NT_STATUS_OK;
333}
334
335/***************************************************************************
336 Add privilege to sid
337****************************************************************************/
338
339static bool grant_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
340{
341 uint64_t old_mask, new_mask;
342
343 ZERO_STRUCT( old_mask );
344 ZERO_STRUCT( new_mask );
345
346 if ( get_privileges( sid, &old_mask ) )
347 new_mask = old_mask;
348 else
349 new_mask = 0;
350
351 new_mask |= priv_mask;
352
353 DEBUG(10,("grant_privilege: %s\n", sid_string_dbg(sid)));
354
355 DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)new_mask));
356
357 DEBUGADD( 10, ("new privilege mask: 0x%llx\n", (unsigned long long)new_mask));
358
359 return set_privileges( sid, new_mask );
360}
361
362/*********************************************************************
363 Add a privilege based on its name
364*********************************************************************/
365
366bool grant_privilege_by_name(const struct dom_sid *sid, const char *name)
367{
368 uint64_t mask;
369
370 if (! se_priv_from_name(name, &mask)) {
371 DEBUG(3, ("grant_privilege_by_name: "
372 "No Such Privilege Found (%s)\n", name));
373 return False;
374 }
375
376 return grant_privilege_bitmap( sid, mask );
377}
378
379/***************************************************************************
380 Grant a privilege set (list of LUID values) from a sid
381****************************************************************************/
382
383bool grant_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
384{
385 uint64_t privilege_mask;
386 if (!privilege_set_to_se_priv(&privilege_mask, set)) {
387 return false;
388 }
389 return grant_privilege_bitmap(sid, privilege_mask);
390}
391
392/***************************************************************************
393 Remove privilege from sid
394****************************************************************************/
395
396static bool revoke_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
397{
398 uint64_t mask;
399
400 /* if the user has no privileges, then we can't revoke any */
401
402 if ( !get_privileges( sid, &mask ) )
403 return True;
404
405 DEBUG(10,("revoke_privilege: %s\n", sid_string_dbg(sid)));
406
407 DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)mask));
408
409 mask &= ~priv_mask;
410
411 DEBUGADD( 10, ("new privilege mask: 0x%llx\n", (unsigned long long)mask));
412
413 return set_privileges( sid, mask );
414}
415
416/***************************************************************************
417 Remove a privilege set (list of LUID values) from a sid
418****************************************************************************/
419
420bool revoke_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
421{
422 uint64_t privilege_mask;
423 if (!privilege_set_to_se_priv(&privilege_mask, set)) {
424 return false;
425 }
426 return revoke_privilege_bitmap(sid, privilege_mask);
427}
428
429/*********************************************************************
430 Revoke all privileges
431*********************************************************************/
432
433bool revoke_all_privileges( const struct dom_sid *sid )
434{
435 return revoke_privilege_bitmap( sid, SE_ALL_PRIVS);
436}
437
438/*********************************************************************
439 Add a privilege based on its name
440*********************************************************************/
441
442bool revoke_privilege_by_name(const struct dom_sid *sid, const char *name)
443{
444 uint64_t mask;
445
446 if (! se_priv_from_name(name, &mask)) {
447 DEBUG(3, ("revoke_privilege_by_name: "
448 "No Such Privilege Found (%s)\n", name));
449 return False;
450 }
451
452 return revoke_privilege_bitmap(sid, mask);
453
454}
455
456/***************************************************************************
457 Retrieve the SIDs assigned to a given privilege
458****************************************************************************/
459
460NTSTATUS privilege_create_account(const struct dom_sid *sid )
461{
462 return ( grant_privilege_bitmap(sid, 0) ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL);
463}
464
465/***************************************************************************
466 Delete a privileged account
467****************************************************************************/
468
469NTSTATUS privilege_delete_account(const struct dom_sid *sid)
470{
471 struct db_context *db = get_account_pol_db();
472 fstring tmp, keystr;
473
474 if (!lp_enable_privileges()) {
475 return NT_STATUS_OK;
476 }
477
478 if (!db) {
479 return NT_STATUS_INVALID_HANDLE;
480 }
481
482 if (!sid || (sid->num_auths == 0)) {
483 return NT_STATUS_INVALID_SID;
484 }
485
486 /* PRIV_<SID> (NULL terminated) as the key */
487
488 fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
489
490 return dbwrap_delete_bystring(db, keystr);
491}
492
493/*******************************************************************
494*******************************************************************/
495
496bool is_privileged_sid( const struct dom_sid *sid )
497{
498 uint64_t mask;
499
500 return get_privileges( sid, &mask );
501}
502
503/*******************************************************************
504*******************************************************************/
505
506bool grant_all_privileges( const struct dom_sid *sid )
507{
508 uint64_t mask;
509
510 se_priv_put_all_privileges(&mask);
511
512 return grant_privilege_bitmap( sid, mask );
513}
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