1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
|
/*
Unix SMB/CIFS implementation.
uid/user handling
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Gerald (Jerry) Carter 2003
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/*****************************************************************
*THE CANONICAL* convert name to SID function.
Tries local lookup first - for local domains - then uses winbind.
*****************************************************************/
BOOL lookup_name(const char *domain, const char *name, DOM_SID *psid, enum SID_NAME_USE *name_type)
{
fstring sid;
BOOL local_lookup = False;
*name_type = SID_NAME_UNKNOWN;
/* If we are looking up a domain user, make sure it is
for the local machine only */
if (strequal(domain, get_global_sam_name())) {
if (local_lookup_name(name, psid, name_type)) {
DEBUG(10,
("lookup_name: (local) [%s]\\[%s] -> SID %s (type %s: %u)\n",
domain, name, sid_to_string(sid,psid),
sid_type_lookup(*name_type), (unsigned int)*name_type));
return True;
}
} else {
/* Remote */
if (winbind_lookup_name(domain, name, psid, name_type)) {
DEBUG(10,("lookup_name (winbindd): [%s]\\[%s] -> SID %s (type %u)\n",
domain, name, sid_to_string(sid, psid),
(unsigned int)*name_type));
return True;
}
}
DEBUG(10, ("lookup_name: %s lookup for [%s]\\[%s] failed\n",
local_lookup ? "local" : "winbind", domain, name));
return False;
}
/*****************************************************************
*THE CANONICAL* convert SID to name function.
Tries local lookup first - for local sids, then tries winbind.
*****************************************************************/
BOOL lookup_sid(const DOM_SID *sid, fstring dom_name, fstring name, enum SID_NAME_USE *name_type)
{
if (!name_type)
return False;
*name_type = SID_NAME_UNKNOWN;
/* Check if this is our own sid. This should perhaps be done by
winbind? For the moment handle it here. */
if (sid_check_is_domain(sid)) {
fstrcpy(dom_name, get_global_sam_name());
fstrcpy(name, "");
*name_type = SID_NAME_DOMAIN;
return True;
}
if (sid_check_is_builtin(sid)) {
/* Got through map_domain_sid_to_name here so that the mapping
* of S-1-5-32 to the name "BUILTIN" in as few places as
* possible. We might add i18n... */
SMB_ASSERT(map_domain_sid_to_name(sid, dom_name));
/* Yes, W2k3 returns "BUILTIN" both as domain and name here */
fstrcpy(name, dom_name);
*name_type = SID_NAME_DOMAIN;
return True;
}
if (sid_check_is_in_our_domain(sid)) {
uint32 rid;
SMB_ASSERT(sid_peek_rid(sid, &rid));
/* For our own domain passdb is responsible */
fstrcpy(dom_name, get_global_sam_name());
return local_lookup_rid(rid, name, name_type);
}
if (winbind_lookup_sid(sid, dom_name, name, name_type)) {
return True;
}
DEBUG(10,("lookup_sid: winbind lookup for SID %s failed - trying "
"special SIDs.\n", sid_string_static(sid)));
{
const char *dom, *obj_name;
if (lookup_special_sid(sid, &dom, &obj_name, name_type)) {
DEBUG(10, ("found %s\\%s\n", dom, obj_name));
fstrcpy(dom_name, dom);
fstrcpy(name, obj_name);
return True;
}
}
DEBUG(10, ("lookup_sid failed\n"));
return False;
}
/*****************************************************************
Id mapping cache. This is to avoid Winbind mappings already
seen by smbd to be queried too frequently, keeping winbindd
busy, and blocking smbd while winbindd is busy with other
stuff. Written by Michael Steffens <michael.steffens@hp.com>,
modified to use linked lists by jra.
*****************************************************************/
#define MAX_UID_SID_CACHE_SIZE 100
#define TURNOVER_UID_SID_CACHE_SIZE 10
#define MAX_GID_SID_CACHE_SIZE 100
#define TURNOVER_GID_SID_CACHE_SIZE 10
static size_t n_uid_sid_cache = 0;
static size_t n_gid_sid_cache = 0;
static struct uid_sid_cache {
struct uid_sid_cache *next, *prev;
uid_t uid;
DOM_SID sid;
enum SID_NAME_USE sidtype;
} *uid_sid_cache_head;
static struct gid_sid_cache {
struct gid_sid_cache *next, *prev;
gid_t gid;
DOM_SID sid;
enum SID_NAME_USE sidtype;
} *gid_sid_cache_head;
/*****************************************************************
Find a SID given a uid.
*****************************************************************/
static BOOL fetch_sid_from_uid_cache(DOM_SID *psid, uid_t uid)
{
struct uid_sid_cache *pc;
for (pc = uid_sid_cache_head; pc; pc = pc->next) {
if (pc->uid == uid) {
fstring sid;
*psid = pc->sid;
DEBUG(3,("fetch sid from uid cache %u -> %s\n",
(unsigned int)uid, sid_to_string(sid, psid)));
DLIST_PROMOTE(uid_sid_cache_head, pc);
return True;
}
}
return False;
}
/*****************************************************************
Find a uid given a SID.
*****************************************************************/
static BOOL fetch_uid_from_cache( uid_t *puid, const DOM_SID *psid )
{
struct uid_sid_cache *pc;
for (pc = uid_sid_cache_head; pc; pc = pc->next) {
if (sid_compare(&pc->sid, psid) == 0) {
fstring sid;
*puid = pc->uid;
DEBUG(3,("fetch uid from cache %u -> %s\n",
(unsigned int)*puid, sid_to_string(sid, psid)));
DLIST_PROMOTE(uid_sid_cache_head, pc);
return True;
}
}
return False;
}
/*****************************************************************
Store uid to SID mapping in cache.
*****************************************************************/
static void store_uid_sid_cache(const DOM_SID *psid, uid_t uid)
{
struct uid_sid_cache *pc;
if (n_uid_sid_cache >= MAX_UID_SID_CACHE_SIZE && n_uid_sid_cache > TURNOVER_UID_SID_CACHE_SIZE) {
/* Delete the last TURNOVER_UID_SID_CACHE_SIZE entries. */
struct uid_sid_cache *pc_next;
size_t i;
for (i = 0, pc = uid_sid_cache_head; i < (n_uid_sid_cache - TURNOVER_UID_SID_CACHE_SIZE); i++, pc = pc->next)
;
for(; pc; pc = pc_next) {
pc_next = pc->next;
DLIST_REMOVE(uid_sid_cache_head,pc);
SAFE_FREE(pc);
n_uid_sid_cache--;
}
}
pc = SMB_MALLOC_P(struct uid_sid_cache);
if (!pc)
return;
pc->uid = uid;
sid_copy(&pc->sid, psid);
DLIST_ADD(uid_sid_cache_head, pc);
n_uid_sid_cache++;
}
/*****************************************************************
Find a SID given a gid.
*****************************************************************/
static BOOL fetch_sid_from_gid_cache(DOM_SID *psid, gid_t gid)
{
struct gid_sid_cache *pc;
for (pc = gid_sid_cache_head; pc; pc = pc->next) {
if (pc->gid == gid) {
fstring sid;
*psid = pc->sid;
DEBUG(3,("fetch sid from gid cache %u -> %s\n",
(unsigned int)gid, sid_to_string(sid, psid)));
DLIST_PROMOTE(gid_sid_cache_head, pc);
return True;
}
}
return False;
}
/*****************************************************************
Find a gid given a SID.
*****************************************************************/
static BOOL fetch_gid_from_cache(gid_t *pgid, const DOM_SID *psid)
{
struct gid_sid_cache *pc;
for (pc = gid_sid_cache_head; pc; pc = pc->next) {
if (sid_compare(&pc->sid, psid) == 0) {
fstring sid;
*pgid = pc->gid;
DEBUG(3,("fetch gid from cache %u -> %s\n",
(unsigned int)*pgid, sid_to_string(sid, psid)));
DLIST_PROMOTE(gid_sid_cache_head, pc);
return True;
}
}
return False;
}
/*****************************************************************
Store gid to SID mapping in cache.
*****************************************************************/
static void store_gid_sid_cache(const DOM_SID *psid, gid_t gid)
{
struct gid_sid_cache *pc;
if (n_gid_sid_cache >= MAX_GID_SID_CACHE_SIZE && n_gid_sid_cache > TURNOVER_GID_SID_CACHE_SIZE) {
/* Delete the last TURNOVER_GID_SID_CACHE_SIZE entries. */
struct gid_sid_cache *pc_next;
size_t i;
for (i = 0, pc = gid_sid_cache_head; i < (n_gid_sid_cache - TURNOVER_GID_SID_CACHE_SIZE); i++, pc = pc->next)
;
for(; pc; pc = pc_next) {
pc_next = pc->next;
DLIST_REMOVE(gid_sid_cache_head,pc);
SAFE_FREE(pc);
n_gid_sid_cache--;
}
}
pc = SMB_MALLOC_P(struct gid_sid_cache);
if (!pc)
return;
pc->gid = gid;
sid_copy(&pc->sid, psid);
DLIST_ADD(gid_sid_cache_head, pc);
n_gid_sid_cache++;
}
/*****************************************************************
*THE CANONICAL* convert uid_t to SID function.
*****************************************************************/
NTSTATUS uid_to_sid(DOM_SID *psid, uid_t uid)
{
fstring sid;
uid_t low, high;
ZERO_STRUCTP(psid);
if (fetch_sid_from_uid_cache(psid, uid))
return ( psid ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL );
/* DC's never use winbindd to resolve users outside the
defined idmap range */
if ( lp_server_role()==ROLE_DOMAIN_MEMBER
|| (lp_idmap_uid(&low, &high) && uid >= low && uid <= high) )
{
if (winbind_uid_to_sid(psid, uid)) {
DEBUG(10,("uid_to_sid: winbindd %u -> %s\n",
(unsigned int)uid, sid_to_string(sid, psid)));
if (psid)
store_uid_sid_cache(psid, uid);
return ( psid ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL );
}
}
if (!local_uid_to_sid(psid, uid)) {
DEBUG(10,("uid_to_sid: local %u failed to map to sid\n", (unsigned int)uid ));
return NT_STATUS_UNSUCCESSFUL;
}
DEBUG(10,("uid_to_sid: local %u -> %s\n", (unsigned int)uid, sid_to_string(sid, psid)));
store_uid_sid_cache(psid, uid);
return NT_STATUS_OK;
}
/*****************************************************************
*THE CANONICAL* convert gid_t to SID function.
*****************************************************************/
NTSTATUS gid_to_sid(DOM_SID *psid, gid_t gid)
{
fstring sid;
gid_t low, high;
ZERO_STRUCTP(psid);
if (fetch_sid_from_gid_cache(psid, gid))
return ( psid ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL );
/* DC's never use winbindd to resolve groups outside the
defined idmap range */
if ( lp_server_role()==ROLE_DOMAIN_MEMBER
|| (lp_idmap_gid(&low, &high) && gid >= low && gid <= high) )
{
if (winbind_gid_to_sid(psid, gid)) {
DEBUG(10,("gid_to_sid: winbindd %u -> %s\n",
(unsigned int)gid, sid_to_string(sid, psid)));
if (psid)
store_gid_sid_cache(psid, gid);
return ( psid ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL );
}
}
if (!local_gid_to_sid(psid, gid)) {
DEBUG(10,("gid_to_sid: local %u failed to map to sid\n", (unsigned int)gid ));
return NT_STATUS_UNSUCCESSFUL;
}
DEBUG(10,("gid_to_sid: local %u -> %s\n", (unsigned int)gid, sid_to_string(sid, psid)));
store_gid_sid_cache(psid, gid);
return NT_STATUS_OK;
}
/*****************************************************************
*THE CANONICAL* convert SID to uid function.
*****************************************************************/
NTSTATUS sid_to_uid(const DOM_SID *psid, uid_t *puid)
{
fstring dom_name, name, sid_str;
enum SID_NAME_USE name_type;
if (fetch_uid_from_cache(puid, psid))
return NT_STATUS_OK;
/* if this is our SID then go straight to a local lookup */
if ( sid_compare_domain(get_global_sam_sid(), psid) == 0 ) {
DEBUG(10,("sid_to_uid: my domain (%s) - trying local.\n",
sid_string_static(psid) ));
if ( local_sid_to_uid(puid, psid, &name_type) )
goto success;
DEBUG(10,("sid_to_uid: local lookup failed\n"));
return NT_STATUS_UNSUCCESSFUL;
}
/* If it is not our local domain, only hope is winbindd */
if ( !winbind_lookup_sid(psid, dom_name, name, &name_type) ) {
DEBUG(10,("sid_to_uid: winbind lookup for non-local sid %s failed\n",
sid_string_static(psid) ));
return NT_STATUS_UNSUCCESSFUL;
}
/* If winbindd does know the SID, ensure this is a user */
if (name_type != SID_NAME_USER) {
DEBUG(10,("sid_to_uid: winbind lookup succeeded but SID is not a user (%u)\n",
(unsigned int)name_type ));
return NT_STATUS_INVALID_PARAMETER;
}
/* get the uid. Has to work or else we are dead in the water */
if ( !winbind_sid_to_uid(puid, psid) ) {
DEBUG(10,("sid_to_uid: winbind failed to allocate a new uid for sid %s\n",
sid_to_string(sid_str, psid) ));
return NT_STATUS_UNSUCCESSFUL;
}
success:
DEBUG(10,("sid_to_uid: %s -> %u\n", sid_to_string(sid_str, psid),
(unsigned int)*puid ));
store_uid_sid_cache(psid, *puid);
return NT_STATUS_OK;
}
/*****************************************************************
*THE CANONICAL* convert SID to gid function.
Group mapping is used for gids that maps to Wellknown SIDs
*****************************************************************/
NTSTATUS sid_to_gid(const DOM_SID *psid, gid_t *pgid)
{
fstring dom_name, name, sid_str;
enum SID_NAME_USE name_type;
if (fetch_gid_from_cache(pgid, psid))
return NT_STATUS_OK;
/*
* First we must look up the name and decide if this is a group sid.
* Group mapping can deal with foreign SIDs
*/
if ( local_sid_to_gid(pgid, psid, &name_type) )
goto success;
if (!winbind_lookup_sid(psid, dom_name, name, &name_type)) {
DEBUG(10,("sid_to_gid: no one knows the SID %s (tried local, then winbind)\n", sid_to_string(sid_str, psid)));
return NT_STATUS_UNSUCCESSFUL;
}
/* winbindd knows it; Ensure this is a group sid */
if ((name_type != SID_NAME_DOM_GRP) && (name_type != SID_NAME_ALIAS)
&& (name_type != SID_NAME_WKN_GRP))
{
DEBUG(10,("sid_to_gid: winbind lookup succeeded but SID is not a known group (%u)\n",
(unsigned int)name_type ));
/* winbindd is running and knows about this SID. Just the wrong type.
Don't fallback to a local lookup here */
return NT_STATUS_INVALID_PARAMETER;
}
/* winbindd knows it and it is a type of group; sid_to_gid must succeed
or we are dead in the water */
if ( !winbind_sid_to_gid(pgid, psid) ) {
DEBUG(10,("sid_to_gid: winbind failed to allocate a new gid for sid %s\n",
sid_to_string(sid_str, psid) ));
return NT_STATUS_UNSUCCESSFUL;
}
success:
DEBUG(10,("sid_to_gid: %s -> %u\n", sid_to_string(sid_str, psid),
(unsigned int)*pgid ));
store_gid_sid_cache(psid, *pgid);
return NT_STATUS_OK;
}
|