source: branches/samba-3.3.x/source/lib/privileges.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: 11.8 KB
RevLine 
[206]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
26#define PRIVPREFIX "PRIV_"
27
28typedef struct {
29 size_t count;
30 DOM_SID *list;
31} SID_LIST;
32
33typedef struct {
34 TALLOC_CTX *mem_ctx;
35 SE_PRIV privilege;
36 SID_LIST sids;
37} PRIV_SID_LIST;
38
39
40static bool get_privileges( const DOM_SID *sid, SE_PRIV *mask )
41{
42 struct db_context *db = get_account_pol_db();
43 fstring tmp, keystr;
44 TDB_DATA data;
45
46 /* Fail if the admin has not enable privileges */
47
48 if ( !lp_enable_privileges() ) {
49 return False;
50 }
51
52 if ( db == NULL )
53 return False;
54
55 /* PRIV_<SID> (NULL terminated) as the key */
56
57 fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
58
59 data = dbwrap_fetch_bystring( db, talloc_tos(), keystr );
60
61 if ( !data.dptr ) {
62 DEBUG(3, ("get_privileges: No privileges assigned to SID "
63 "[%s]\n", sid_string_dbg(sid)));
64 return False;
65 }
66
67 SMB_ASSERT( data.dsize == sizeof( SE_PRIV ) );
68
69 se_priv_copy( mask, (SE_PRIV*)data.dptr );
70 TALLOC_FREE(data.dptr);
71
72 return True;
73}
74
75/***************************************************************************
76 Store the privilege mask (set) for a given SID
77****************************************************************************/
78
79static bool set_privileges( const DOM_SID *sid, SE_PRIV *mask )
80{
81 struct db_context *db = get_account_pol_db();
82 fstring tmp, keystr;
83 TDB_DATA data;
84
85 if ( !lp_enable_privileges() )
86 return False;
87
88 if ( db == NULL )
89 return False;
90
91 if ( !sid || (sid->num_auths == 0) ) {
92 DEBUG(0,("set_privileges: Refusing to store empty SID!\n"));
93 return False;
94 }
95
96 /* PRIV_<SID> (NULL terminated) as the key */
97
98 fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
99
100 /* no packing. static size structure, just write it out */
101
102 data.dptr = (uint8 *)mask;
103 data.dsize = sizeof(SE_PRIV);
104
105 return NT_STATUS_IS_OK(dbwrap_store_bystring(db, keystr, data,
106 TDB_REPLACE));
107}
108
109/*********************************************************************
110 get a list of all privileges for all sids in the list
111*********************************************************************/
112
113bool get_privileges_for_sids(SE_PRIV *privileges, DOM_SID *slist, int scount)
114{
115 SE_PRIV mask;
116 int i;
117 bool found = False;
118
119 se_priv_copy( privileges, &se_priv_none );
120
121 for ( i=0; i<scount; i++ ) {
122 /* don't add unless we actually have a privilege assigned */
123
124 if ( !get_privileges( &slist[i], &mask ) )
125 continue;
126
127 DEBUG(5,("get_privileges_for_sids: sid = %s\nPrivilege "
128 "set:\n", sid_string_dbg(&slist[i])));
129 dump_se_priv( DBGC_ALL, 5, &mask );
130
131 se_priv_add( privileges, &mask );
132 found = True;
133 }
134
135 return found;
136}
137
138
139/*********************************************************************
140 traversal functions for privilege_enumerate_accounts
141*********************************************************************/
142
143static int priv_traverse_fn(struct db_record *rec, void *state)
144{
145 PRIV_SID_LIST *priv = (PRIV_SID_LIST *)state;
146 int prefixlen = strlen(PRIVPREFIX);
147 DOM_SID sid;
148 fstring sid_string;
149
150 /* easy check first */
151
152 if (rec->value.dsize != sizeof(SE_PRIV) )
153 return 0;
154
155 /* check we have a PRIV_+SID entry */
156
157 if ( strncmp((char *)rec->key.dptr, PRIVPREFIX, prefixlen) != 0)
158 return 0;
159
160 /* check to see if we are looking for a particular privilege */
161
162 if ( !se_priv_equal(&priv->privilege, &se_priv_none) ) {
163 SE_PRIV mask;
164
165 se_priv_copy( &mask, (SE_PRIV*)rec->value.dptr );
166
167 /* if the SID does not have the specified privilege
168 then just return */
169
170 if ( !is_privilege_assigned( &mask, &priv->privilege) )
171 return 0;
172 }
173
174 fstrcpy( sid_string, (char *)&(rec->key.dptr[strlen(PRIVPREFIX)]) );
175
176 /* this is a last ditch safety check to preventing returning
177 and invalid SID (i've somehow run into this on development branches) */
178
179 if ( strcmp( "S-0-0", sid_string ) == 0 )
180 return 0;
181
182 if ( !string_to_sid(&sid, sid_string) ) {
183 DEBUG(0,("travsersal_fn_enum__acct: Could not convert SID [%s]\n",
184 sid_string));
185 return 0;
186 }
187
188 if (!NT_STATUS_IS_OK(add_sid_to_array(priv->mem_ctx, &sid,
189 &priv->sids.list,
190 &priv->sids.count)))
191 {
192 return 0;
193 }
194
195 return 0;
196}
197
198/*********************************************************************
199 Retreive list of privileged SIDs (for _lsa_enumerate_accounts()
200*********************************************************************/
201
202NTSTATUS privilege_enumerate_accounts(DOM_SID **sids, int *num_sids)
203{
204 struct db_context *db = get_account_pol_db();
205 PRIV_SID_LIST priv;
206
207 if (db == NULL) {
208 return NT_STATUS_ACCESS_DENIED;
209 }
210
211 ZERO_STRUCT(priv);
212
213 se_priv_copy( &priv.privilege, &se_priv_none );
214
215 db->traverse_read(db, priv_traverse_fn, &priv);
216
217 /* give the memory away; caller will free */
218
219 *sids = priv.sids.list;
220 *num_sids = priv.sids.count;
221
222 return NT_STATUS_OK;
223}
224
225/*********************************************************************
226 Retrieve list of SIDs granted a particular privilege
227*********************************************************************/
228
229NTSTATUS privilege_enum_sids(const SE_PRIV *mask, TALLOC_CTX *mem_ctx,
230 DOM_SID **sids, int *num_sids)
231{
232 struct db_context *db = get_account_pol_db();
233 PRIV_SID_LIST priv;
234
235 if (db == NULL) {
236 return NT_STATUS_ACCESS_DENIED;
237 }
238
239 ZERO_STRUCT(priv);
240
241 se_priv_copy(&priv.privilege, mask);
242 priv.mem_ctx = mem_ctx;
243
244 db->traverse_read(db, priv_traverse_fn, &priv);
245
246 /* give the memory away; caller will free */
247
248 *sids = priv.sids.list;
249 *num_sids = priv.sids.count;
250
251 return NT_STATUS_OK;
252}
253
254/***************************************************************************
255 Add privilege to sid
256****************************************************************************/
257
258bool grant_privilege(const DOM_SID *sid, const SE_PRIV *priv_mask)
259{
260 SE_PRIV old_mask, new_mask;
261
262 ZERO_STRUCT( old_mask );
263 ZERO_STRUCT( new_mask );
264
265 if ( get_privileges( sid, &old_mask ) )
266 se_priv_copy( &new_mask, &old_mask );
267 else
268 se_priv_copy( &new_mask, &se_priv_none );
269
270 se_priv_add( &new_mask, priv_mask );
271
272 DEBUG(10,("grant_privilege: %s\n", sid_string_dbg(sid)));
273
274 DEBUGADD( 10, ("original privilege mask:\n"));
275 dump_se_priv( DBGC_ALL, 10, &old_mask );
276
277 DEBUGADD( 10, ("new privilege mask:\n"));
278 dump_se_priv( DBGC_ALL, 10, &new_mask );
279
280 return set_privileges( sid, &new_mask );
281}
282
283/*********************************************************************
284 Add a privilege based on its name
285*********************************************************************/
286
287bool grant_privilege_by_name(DOM_SID *sid, const char *name)
288{
289 SE_PRIV mask;
290
291 if (! se_priv_from_name(name, &mask)) {
292 DEBUG(3, ("grant_privilege_by_name: "
293 "No Such Privilege Found (%s)\n", name));
294 return False;
295 }
296
297 return grant_privilege( sid, &mask );
298}
299
300/***************************************************************************
301 Remove privilege from sid
302****************************************************************************/
303
304bool revoke_privilege(const DOM_SID *sid, const SE_PRIV *priv_mask)
305{
306 SE_PRIV mask;
307
308 /* if the user has no privileges, then we can't revoke any */
309
310 if ( !get_privileges( sid, &mask ) )
311 return True;
312
313 DEBUG(10,("revoke_privilege: %s\n", sid_string_dbg(sid)));
314
315 DEBUGADD( 10, ("original privilege mask:\n"));
316 dump_se_priv( DBGC_ALL, 10, &mask );
317
318 se_priv_remove( &mask, priv_mask );
319
320 DEBUGADD( 10, ("new privilege mask:\n"));
321 dump_se_priv( DBGC_ALL, 10, &mask );
322
323 return set_privileges( sid, &mask );
324}
325
326/*********************************************************************
327 Revoke all privileges
328*********************************************************************/
329
330bool revoke_all_privileges( DOM_SID *sid )
331{
332 return revoke_privilege( sid, &se_priv_all );
333}
334
335/*********************************************************************
336 Add a privilege based on its name
337*********************************************************************/
338
339bool revoke_privilege_by_name(DOM_SID *sid, const char *name)
340{
341 SE_PRIV mask;
342
343 if (! se_priv_from_name(name, &mask)) {
344 DEBUG(3, ("revoke_privilege_by_name: "
345 "No Such Privilege Found (%s)\n", name));
346 return False;
347 }
348
349 return revoke_privilege(sid, &mask);
350
351}
352
353/***************************************************************************
354 Retrieve the SIDs assigned to a given privilege
355****************************************************************************/
356
357NTSTATUS privilege_create_account(const DOM_SID *sid )
358{
359 return ( grant_privilege(sid, &se_priv_none) ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL);
360}
361
362/****************************************************************************
363 initialise a privilege list and set the talloc context
364 ****************************************************************************/
365
366NTSTATUS privilege_set_init(PRIVILEGE_SET *priv_set)
367{
368 TALLOC_CTX *mem_ctx;
369
370 ZERO_STRUCTP( priv_set );
371
372 mem_ctx = talloc_init("privilege set");
373 if ( !mem_ctx ) {
374 DEBUG(0,("privilege_set_init: failed to initialize talloc ctx!\n"));
375 return NT_STATUS_NO_MEMORY;
376 }
377
378 priv_set->mem_ctx = mem_ctx;
379
380 return NT_STATUS_OK;
381}
382
383/****************************************************************************
384 initialise a privilege list and with someone else's talloc context
385****************************************************************************/
386
387NTSTATUS privilege_set_init_by_ctx(TALLOC_CTX *mem_ctx, PRIVILEGE_SET *priv_set)
388{
389 ZERO_STRUCTP( priv_set );
390
391 priv_set->mem_ctx = mem_ctx;
392 priv_set->ext_ctx = True;
393
394 return NT_STATUS_OK;
395}
396
397/****************************************************************************
398 Free all memory used by a PRIVILEGE_SET
399****************************************************************************/
400
401void privilege_set_free(PRIVILEGE_SET *priv_set)
402{
403 if ( !priv_set )
404 return;
405
406 if ( !( priv_set->ext_ctx ) )
407 talloc_destroy( priv_set->mem_ctx );
408
409 ZERO_STRUCTP( priv_set );
410}
411
412/****************************************************************************
413 duplicate alloc luid_attr
414 ****************************************************************************/
415
416NTSTATUS dup_luid_attr(TALLOC_CTX *mem_ctx, LUID_ATTR **new_la, LUID_ATTR *old_la, int count)
417{
418 int i;
419
420 if ( !old_la )
421 return NT_STATUS_OK;
422
423 if (count) {
424 *new_la = TALLOC_ARRAY(mem_ctx, LUID_ATTR, count);
425 if ( !*new_la ) {
426 DEBUG(0,("dup_luid_attr: failed to alloc new LUID_ATTR array [%d]\n", count));
427 return NT_STATUS_NO_MEMORY;
428 }
429 } else {
430 *new_la = NULL;
431 }
432
433 for (i=0; i<count; i++) {
434 (*new_la)[i].luid.high = old_la[i].luid.high;
435 (*new_la)[i].luid.low = old_la[i].luid.low;
436 (*new_la)[i].attr = old_la[i].attr;
437 }
438
439 return NT_STATUS_OK;
440}
441
442/*******************************************************************
443*******************************************************************/
444
445bool is_privileged_sid( const DOM_SID *sid )
446{
447 SE_PRIV mask;
448
449 return get_privileges( sid, &mask );
450}
451
452/*******************************************************************
453*******************************************************************/
454
455bool grant_all_privileges( const DOM_SID *sid )
456{
457 SE_PRIV mask;
458
459 if (!se_priv_put_all_privileges(&mask)) {
460 return False;
461 }
462
463 return grant_privilege( sid, &mask );
464}
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