Line data Source code
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 : #include "lib/util/string_wrappers.h"
31 :
32 : #define PRIVPREFIX "PRIV_"
33 :
34 : typedef struct {
35 : uint32_t count;
36 : struct dom_sid *list;
37 : } SID_LIST;
38 :
39 : typedef struct {
40 : TALLOC_CTX *mem_ctx;
41 : uint64_t privilege;
42 : SID_LIST sids;
43 : } PRIV_SID_LIST;
44 :
45 : /*
46 : interpret an old style SE_PRIV structure
47 : */
48 0 : static uint64_t map_old_SE_PRIV(unsigned char *dptr)
49 : {
50 0 : uint32_t *old_masks = (uint32_t *)dptr;
51 : /*
52 : * the old privileges code only ever used up to 0x800, except
53 : * for a special case of 'SE_ALL_PRIVS' which was 0xFFFFFFFF
54 : */
55 0 : if (old_masks[0] == 0xFFFFFFFF) {
56 : /* they set all privileges */
57 0 : return SE_ALL_PRIVS;
58 : }
59 :
60 : /* the old code used the machine byte order, but we don't know
61 : * the byte order of the machine that wrote it. However we can
62 : * tell what byte order it was by taking advantage of the fact
63 : * that it only ever use up to 0x800
64 : */
65 0 : if (dptr[0] || dptr[1]) {
66 : /* it was little endian */
67 0 : return IVAL(dptr, 0);
68 : }
69 :
70 : /* it was either zero or big-endian */
71 0 : return RIVAL(dptr, 0);
72 : }
73 :
74 :
75 190123 : static bool get_privileges( const struct dom_sid *sid, uint64_t *mask )
76 : {
77 190123 : struct db_context *db = get_account_pol_db();
78 12 : struct dom_sid_buf tmp;
79 12 : fstring keystr;
80 12 : TDB_DATA data;
81 12 : NTSTATUS status;
82 :
83 : /* Fail if the admin has not enable privileges */
84 :
85 190123 : if ( !lp_enable_privileges() ) {
86 0 : return False;
87 : }
88 :
89 190123 : if ( db == NULL )
90 0 : return False;
91 :
92 : /* PRIV_<SID> (NULL terminated) as the key */
93 :
94 190123 : fstr_sprintf(keystr, "%s%s", PRIVPREFIX, dom_sid_str_buf(sid, &tmp));
95 :
96 190123 : status = dbwrap_fetch_bystring(db, talloc_tos(), keystr, &data);
97 :
98 190123 : if (!NT_STATUS_IS_OK(status)) {
99 156314 : DEBUG(4, ("get_privileges: No privileges assigned to SID "
100 : "[%s]\n", tmp.buf));
101 156314 : return False;
102 : }
103 :
104 33809 : if (data.dsize == 4*4) {
105 : /* it's an old style SE_PRIV structure. */
106 0 : *mask = map_old_SE_PRIV(data.dptr);
107 : } else {
108 33809 : if (data.dsize != sizeof( uint64_t ) ) {
109 0 : DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
110 : "[%s]\n", tmp.buf));
111 0 : return False;
112 : }
113 :
114 33809 : *mask = BVAL(data.dptr, 0);
115 : }
116 :
117 33809 : TALLOC_FREE(data.dptr);
118 :
119 33809 : return True;
120 : }
121 :
122 : /***************************************************************************
123 : Store the privilege mask (set) for a given SID
124 : ****************************************************************************/
125 :
126 684 : static bool set_privileges( const struct dom_sid *sid, uint64_t mask )
127 : {
128 684 : struct db_context *db = get_account_pol_db();
129 12 : uint8_t privbuf[8];
130 12 : struct dom_sid_buf tmp;
131 12 : fstring keystr;
132 684 : TDB_DATA data = { .dptr = privbuf, .dsize = sizeof(privbuf), };
133 :
134 684 : if ( !lp_enable_privileges() )
135 0 : return False;
136 :
137 684 : if ( db == NULL )
138 0 : return False;
139 :
140 684 : if ( !sid || (sid->num_auths == 0) ) {
141 0 : DEBUG(0,("set_privileges: Refusing to store empty SID!\n"));
142 0 : return False;
143 : }
144 :
145 : /* PRIV_<SID> (NULL terminated) as the key */
146 :
147 684 : fstr_sprintf(keystr, "%s%s", PRIVPREFIX, dom_sid_str_buf(sid, &tmp));
148 :
149 : /* This writes the 64 bit bitmask out in little endian format */
150 684 : SBVAL(privbuf,0,mask);
151 :
152 684 : 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 :
160 23312 : bool get_privileges_for_sids(uint64_t *privileges, struct dom_sid *slist, int scount)
161 : {
162 0 : uint64_t mask;
163 0 : int i;
164 23312 : bool found = False;
165 :
166 23312 : *privileges = 0;
167 :
168 212655 : for ( i=0; i<scount; i++ ) {
169 0 : struct dom_sid_buf buf;
170 :
171 : /* don't add unless we actually have a privilege assigned */
172 :
173 189343 : if ( !get_privileges( &slist[i], &mask ) )
174 155590 : continue;
175 :
176 33753 : DBG_INFO("sid = %s\nPrivilege set: 0x%"PRIx64"\n",
177 : dom_sid_str_buf(&slist[i], &buf),
178 : mask);
179 :
180 33753 : *privileges |= mask;
181 33753 : found = True;
182 : }
183 :
184 23312 : return found;
185 : }
186 :
187 96 : NTSTATUS get_privileges_for_sid_as_set(TALLOC_CTX *mem_ctx, PRIVILEGE_SET **privileges, struct dom_sid *sid)
188 : {
189 0 : uint64_t mask;
190 96 : if (!get_privileges(sid, &mask)) {
191 96 : return NT_STATUS_OBJECT_NAME_NOT_FOUND;
192 : }
193 :
194 0 : *privileges = talloc_zero(mem_ctx, PRIVILEGE_SET);
195 0 : if (!*privileges) {
196 0 : return NT_STATUS_NO_MEMORY;
197 : }
198 :
199 0 : if (!se_priv_to_privilege_set(*privileges, mask)) {
200 0 : return NT_STATUS_NO_MEMORY;
201 : }
202 0 : return NT_STATUS_OK;
203 : }
204 :
205 : /*********************************************************************
206 : traversal functions for privilege_enumerate_accounts
207 : *********************************************************************/
208 :
209 0 : static int priv_traverse_fn(struct db_record *rec, void *state)
210 : {
211 0 : PRIV_SID_LIST *priv = (PRIV_SID_LIST *)state;
212 0 : int prefixlen = strlen(PRIVPREFIX);
213 0 : struct dom_sid sid;
214 0 : fstring sid_string;
215 0 : TDB_DATA key;
216 :
217 0 : key = dbwrap_record_get_key(rec);
218 :
219 : /* check we have a PRIV_+SID entry */
220 :
221 0 : if (strncmp((char *)key.dptr, PRIVPREFIX, prefixlen) != 0)
222 0 : return 0;
223 :
224 : /* check to see if we are looking for a particular privilege */
225 :
226 0 : fstrcpy( sid_string, (char *)&(key.dptr[strlen(PRIVPREFIX)]) );
227 :
228 0 : if (priv->privilege != 0) {
229 0 : uint64_t mask;
230 0 : TDB_DATA value;
231 :
232 0 : value = dbwrap_record_get_value(rec);
233 :
234 0 : if (value.dsize == 4*4) {
235 0 : mask = map_old_SE_PRIV(value.dptr);
236 : } else {
237 0 : if (value.dsize != sizeof( uint64_t ) ) {
238 0 : DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
239 : "[%s]\n", sid_string));
240 0 : return 0;
241 : }
242 0 : mask = BVAL(value.dptr, 0);
243 : }
244 :
245 : /* if the SID does not have the specified privilege
246 : then just return */
247 :
248 0 : if ((mask & priv->privilege) == 0) {
249 0 : return 0;
250 : }
251 : }
252 :
253 : /* this is a last ditch safety check to preventing returning
254 : and invalid SID (i've somehow run into this on development branches) */
255 :
256 0 : if ( strcmp( "S-0-0", sid_string ) == 0 )
257 0 : return 0;
258 :
259 0 : if ( !string_to_sid(&sid, sid_string) ) {
260 0 : DBG_WARNING("Could not convert SID [%s]\n", sid_string);
261 0 : return 0;
262 : }
263 :
264 0 : if (!NT_STATUS_IS_OK(add_sid_to_array(priv->mem_ctx, &sid,
265 : &priv->sids.list,
266 : &priv->sids.count)))
267 : {
268 0 : return 0;
269 : }
270 :
271 0 : return 0;
272 : }
273 :
274 : /*********************************************************************
275 : Retrieve list of privileged SIDs (for _lsa_enumerate_accounts()
276 : *********************************************************************/
277 :
278 0 : NTSTATUS privilege_enumerate_accounts(struct dom_sid **sids, int *num_sids)
279 : {
280 0 : struct db_context *db = get_account_pol_db();
281 0 : PRIV_SID_LIST priv;
282 0 : NTSTATUS status;
283 :
284 0 : if (db == NULL) {
285 0 : return NT_STATUS_ACCESS_DENIED;
286 : }
287 :
288 0 : ZERO_STRUCT(priv);
289 :
290 0 : status = dbwrap_traverse_read(db, priv_traverse_fn, &priv, NULL);
291 0 : if (!NT_STATUS_IS_OK(status)) {
292 0 : return status;
293 : }
294 :
295 : /* give the memory away; caller will free */
296 :
297 0 : *sids = priv.sids.list;
298 0 : *num_sids = priv.sids.count;
299 :
300 0 : return NT_STATUS_OK;
301 : }
302 :
303 : /*********************************************************************
304 : Retrieve list of SIDs granted a particular privilege
305 : *********************************************************************/
306 :
307 0 : NTSTATUS privilege_enum_sids(enum sec_privilege privilege, TALLOC_CTX *mem_ctx,
308 : struct dom_sid **sids, int *num_sids)
309 : {
310 0 : struct db_context *db = get_account_pol_db();
311 0 : PRIV_SID_LIST priv;
312 0 : NTSTATUS status;
313 :
314 0 : if (db == NULL) {
315 0 : return NT_STATUS_ACCESS_DENIED;
316 : }
317 :
318 0 : ZERO_STRUCT(priv);
319 :
320 0 : priv.privilege = sec_privilege_mask(privilege);
321 0 : priv.mem_ctx = mem_ctx;
322 :
323 0 : status = dbwrap_traverse_read(db, priv_traverse_fn, &priv, NULL);
324 0 : if (!NT_STATUS_IS_OK(status)) {
325 0 : return status;
326 : }
327 :
328 : /* give the memory away; caller will free */
329 :
330 0 : *sids = priv.sids.list;
331 0 : *num_sids = priv.sids.count;
332 :
333 0 : return NT_STATUS_OK;
334 : }
335 :
336 : /***************************************************************************
337 : Add privilege to sid
338 : ****************************************************************************/
339 :
340 644 : static bool grant_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
341 : {
342 644 : uint64_t old_mask = 0, new_mask = 0;
343 12 : struct dom_sid_buf buf;
344 :
345 644 : if ( get_privileges( sid, &old_mask ) ) {
346 16 : new_mask = old_mask;
347 : }
348 :
349 644 : new_mask |= priv_mask;
350 :
351 644 : DBG_DEBUG("%s\n"
352 : "original privilege mask: 0x%"PRIx64"\n"
353 : "new privilege mask: 0x%"PRIx64"\n",
354 : dom_sid_str_buf(sid, &buf),
355 : old_mask,
356 : new_mask);
357 :
358 644 : return set_privileges( sid, new_mask );
359 : }
360 :
361 : /*********************************************************************
362 : Add a privilege based on its name
363 : *********************************************************************/
364 :
365 50 : bool grant_privilege_by_name(const struct dom_sid *sid, const char *name)
366 : {
367 0 : uint64_t mask;
368 :
369 50 : if (! se_priv_from_name(name, &mask)) {
370 0 : DEBUG(3, ("grant_privilege_by_name: "
371 : "No Such Privilege Found (%s)\n", name));
372 0 : return False;
373 : }
374 :
375 50 : return grant_privilege_bitmap( sid, mask );
376 : }
377 :
378 : /***************************************************************************
379 : Grant a privilege set (list of LUID values) from a sid
380 : ****************************************************************************/
381 :
382 0 : bool grant_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
383 : {
384 0 : uint64_t privilege_mask;
385 0 : if (!privilege_set_to_se_priv(&privilege_mask, set)) {
386 0 : return false;
387 : }
388 0 : return grant_privilege_bitmap(sid, privilege_mask);
389 : }
390 :
391 : /***************************************************************************
392 : Remove privilege from sid
393 : ****************************************************************************/
394 :
395 40 : static bool revoke_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
396 : {
397 0 : uint64_t mask;
398 0 : struct dom_sid_buf buf;
399 :
400 : /* if the user has no privileges, then we can't revoke any */
401 :
402 40 : if ( !get_privileges( sid, &mask ) )
403 0 : return True;
404 :
405 40 : DEBUG(10,("revoke_privilege: %s\n", dom_sid_str_buf(sid, &buf)));
406 :
407 40 : DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)mask));
408 :
409 40 : mask &= ~priv_mask;
410 :
411 40 : DEBUGADD( 10, ("new privilege mask: 0x%llx\n", (unsigned long long)mask));
412 :
413 40 : return set_privileges( sid, mask );
414 : }
415 :
416 : /***************************************************************************
417 : Remove a privilege set (list of LUID values) from a sid
418 : ****************************************************************************/
419 :
420 0 : bool revoke_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
421 : {
422 0 : uint64_t privilege_mask;
423 0 : if (!privilege_set_to_se_priv(&privilege_mask, set)) {
424 0 : return false;
425 : }
426 0 : return revoke_privilege_bitmap(sid, privilege_mask);
427 : }
428 :
429 : /*********************************************************************
430 : Revoke all privileges
431 : *********************************************************************/
432 :
433 0 : bool revoke_all_privileges( const struct dom_sid *sid )
434 : {
435 0 : return revoke_privilege_bitmap( sid, SE_ALL_PRIVS);
436 : }
437 :
438 : /*********************************************************************
439 : Add a privilege based on its name
440 : *********************************************************************/
441 :
442 40 : bool revoke_privilege_by_name(const struct dom_sid *sid, const char *name)
443 : {
444 0 : uint64_t mask;
445 :
446 40 : if (! se_priv_from_name(name, &mask)) {
447 0 : DEBUG(3, ("revoke_privilege_by_name: "
448 : "No Such Privilege Found (%s)\n", name));
449 0 : return False;
450 : }
451 :
452 40 : return revoke_privilege_bitmap(sid, mask);
453 :
454 : }
455 :
456 : /***************************************************************************
457 : Retrieve the SIDs assigned to a given privilege
458 : ****************************************************************************/
459 :
460 495 : NTSTATUS privilege_create_account(const struct dom_sid *sid )
461 : {
462 495 : return ( grant_privilege_bitmap(sid, 0) ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL);
463 : }
464 :
465 : /***************************************************************************
466 : Delete a privileged account
467 : ****************************************************************************/
468 :
469 0 : NTSTATUS privilege_delete_account(const struct dom_sid *sid)
470 : {
471 0 : struct db_context *db = get_account_pol_db();
472 0 : struct dom_sid_buf tmp;
473 0 : fstring keystr;
474 :
475 0 : if (!lp_enable_privileges()) {
476 0 : return NT_STATUS_OK;
477 : }
478 :
479 0 : if (!db) {
480 0 : return NT_STATUS_INVALID_HANDLE;
481 : }
482 :
483 0 : if (!sid || (sid->num_auths == 0)) {
484 0 : return NT_STATUS_INVALID_SID;
485 : }
486 :
487 : /* PRIV_<SID> (NULL terminated) as the key */
488 :
489 0 : fstr_sprintf(keystr, "%s%s", PRIVPREFIX, dom_sid_str_buf(sid, &tmp));
490 :
491 0 : return dbwrap_delete_bystring(db, keystr);
492 : }
493 :
494 : /*******************************************************************
495 : *******************************************************************/
496 :
497 0 : bool is_privileged_sid( const struct dom_sid *sid )
498 : {
499 0 : uint64_t mask;
500 :
501 0 : return get_privileges( sid, &mask );
502 : }
503 :
504 : /*******************************************************************
505 : *******************************************************************/
506 :
507 99 : bool grant_all_privileges( const struct dom_sid *sid )
508 : {
509 2 : uint64_t mask;
510 :
511 99 : se_priv_put_all_privileges(&mask);
512 :
513 99 : return grant_privilege_bitmap( sid, mask );
514 : }
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