summaryrefslogtreecommitdiff
path: root/source4/ntvfs/common/sidmap.c
blob: 3254330c2f774368b88b47ac2ff196fdcbb5efe7 (plain)
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
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
/* 
   Unix SMB/CIFS implementation.

   mapping routines for SID <-> unix uid/gid

   Copyright (C) Andrew Tridgell 2004
   
   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"
#include "librpc/gen_ndr/ndr_security.h"

/*
  these are used for the fallback local uid/gid to sid mapping
  code.
*/
#define SIDMAP_LOCAL_USER_BASE  0x80000000
#define SIDMAP_LOCAL_GROUP_BASE 0xC0000000
#define SIDMAP_MAX_LOCAL_UID    0x3fffffff
#define SIDMAP_MAX_LOCAL_GID    0x3fffffff

/*
  private context for sid mapping routines
*/
struct sidmap_context {
	void *samctx;
};

/*
  open a sidmap context - use talloc_free to close
*/
struct sidmap_context *sidmap_open(TALLOC_CTX *mem_ctx)
{
	struct sidmap_context *sidmap;
	sidmap = talloc_p(mem_ctx, struct sidmap_context);
	if (sidmap == NULL) {
		return NULL;
	}
	sidmap->samctx = samdb_connect(sidmap);
	if (sidmap->samctx == NULL) {
		talloc_free(sidmap);
		return NULL;
	}

	return sidmap;
}


/*
  check the sAMAccountType field of a search result to see if
  the account is a user account
*/
static BOOL is_user_account(struct ldb_message *res)
{
	uint_t atype = samdb_result_uint(res, "sAMAccountType", 0);
	if (atype && (!(atype & ATYPE_ACCOUNT))) {
		return False;
	}
	return True;
}

/*
  check the sAMAccountType field of a search result to see if
  the account is a group account
*/
static BOOL is_group_account(struct ldb_message *res)
{
	uint_t atype = samdb_result_uint(res, "sAMAccountType", 0);
	if (atype && atype == ATYPE_NORMAL_ACCOUNT) {
		return False;
	}
	return True;
}



/*
  return the dom_sid of our primary domain
*/
static NTSTATUS sidmap_primary_domain_sid(struct sidmap_context *sidmap, 
					  TALLOC_CTX *mem_ctx, struct dom_sid **sid)
{
	const char *attrs[] = { "objectSid", NULL };
	void *ctx = talloc_new(mem_ctx);
	const char *sidstr;
	int ret;
	struct ldb_message **res;

	ret = samdb_search(sidmap->samctx, ctx, NULL, &res, attrs, 
			   "(&(objectClass=domain)(name=%s))", lp_workgroup());
	if (ret != 1) {
		talloc_free(ctx);
		return NT_STATUS_NO_SUCH_DOMAIN;
	}
	
	sidstr = samdb_result_string(res[0], "objectSid", NULL);
	if (sidstr == NULL) {
		talloc_free(ctx);
		return NT_STATUS_NO_SUCH_DOMAIN;
	}

	*sid = dom_sid_parse_talloc(mem_ctx, sidstr);
	talloc_free(ctx);
	if (*sid == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	return NT_STATUS_OK;
}


/*
  map a sid to a unix uid
*/
NTSTATUS sidmap_sid_to_unixuid(struct sidmap_context *sidmap, 
			       struct dom_sid *sid, uid_t *uid)
{
	const char *attrs[] = { "sAMAccountName", "unixID", 
				"unixName", "sAMAccountType", NULL };
	int ret;
	const char *s;
	void *ctx;
	struct ldb_message **res;
	const char *sidstr;
	struct dom_sid *domain_sid;
	NTSTATUS status;

	ctx = talloc_new(sidmap);
	sidstr = dom_sid_string(ctx, sid);
	if (sidstr == NULL) {
		talloc_free(ctx);
		return NT_STATUS_NO_MEMORY;
	}

	ret = samdb_search(sidmap->samctx, ctx, NULL, &res, attrs, 
			   "objectSid=%s", sidstr);
	if (ret != 1) {
		goto allocated_sid;
	}

	/* make sure its a user, not a group */
	if (!is_user_account(res[0])) {
		DEBUG(0,("sid_to_unixuid: sid %s is not an account!\n", sidstr));
		talloc_free(ctx);
		return NT_STATUS_INVALID_SID;
	}

	/* first try to get the uid directly */
	s = samdb_result_string(res[0], "unixID", NULL);
	if (s != NULL) {
		*uid = strtoul(s, NULL, 0);
		talloc_free(ctx);
		return NT_STATUS_OK;
	}

	/* next try via the UnixName attribute */
	s = samdb_result_string(res[0], "unixName", NULL);
	if (s != NULL) {
		struct passwd *pwd = getpwnam(s);
		if (!pwd) {
			DEBUG(0,("unixName %s for sid %s does not exist as a local user\n", s, sidstr));
			talloc_free(ctx);
			return NT_STATUS_NO_SUCH_USER;
		}
		*uid = pwd->pw_uid;
		talloc_free(ctx);
		return NT_STATUS_OK;
	}

	/* finally try via the sAMAccountName attribute */
	s = samdb_result_string(res[0], "sAMAccountName", NULL);
	if (s != NULL) {
		struct passwd *pwd = getpwnam(s);
		if (!pwd) {
			DEBUG(0,("sAMAccountName '%s' for sid %s does not exist as a local user\n", s, sidstr));
			talloc_free(ctx);
			return NT_STATUS_NO_SUCH_USER;
		}
		*uid = pwd->pw_uid;
		talloc_free(ctx);
		return NT_STATUS_OK;
	}


allocated_sid:
	status = sidmap_primary_domain_sid(sidmap, ctx, &domain_sid);
	if (!NT_STATUS_IS_OK(status)) {
		talloc_free(ctx);
		return NT_STATUS_NO_SUCH_DOMAIN;
	}

	if (dom_sid_in_domain(domain_sid, sid)) {
		uint32_t rid = sid->sub_auths[sid->num_auths-1];
		if (rid >= SIDMAP_LOCAL_USER_BASE && 
		    rid <  SIDMAP_LOCAL_GROUP_BASE) {
			*uid = rid - SIDMAP_LOCAL_USER_BASE;
			talloc_free(ctx);
			return NT_STATUS_OK;
		}
	}
	

	DEBUG(0,("sid_to_unixuid: no unixID, unixName or sAMAccountName for sid %s\n", 
		 sidstr));

	talloc_free(ctx);
	return NT_STATUS_INVALID_SID;
}


/*
  map a sid to a unix gid
*/
NTSTATUS sidmap_sid_to_unixgid(struct sidmap_context *sidmap,
			       struct dom_sid *sid, gid_t *gid)
{
	const char *attrs[] = { "sAMAccountName", "unixID", 
				"unixName", "sAMAccountType", NULL };
	int ret;
	const char *s;
	void *ctx;
	struct ldb_message **res;
	const char *sidstr;
	NTSTATUS status;
	struct dom_sid *domain_sid;

	ctx = talloc_new(sidmap);
	sidstr = dom_sid_string(ctx, sid);
	if (sidstr == NULL) {
		talloc_free(ctx);
		return NT_STATUS_NO_MEMORY;
	}

	ret = samdb_search(sidmap->samctx, ctx, NULL, &res, attrs, 
			   "objectSid=%s", sidstr);
	if (ret != 1) {
		goto allocated_sid;
	}

	/* make sure its not a user */
	if (!is_group_account(res[0])) {
		DEBUG(0,("sid_to_unixgid: sid %s is a ATYPE_NORMAL_ACCOUNT\n", sidstr));
		talloc_free(ctx);
		return NT_STATUS_INVALID_SID;
	}

	/* first try to get the gid directly */
	s = samdb_result_string(res[0], "unixID", NULL);
	if (s != NULL) {
		*gid = strtoul(s, NULL, 0);
		talloc_free(ctx);
		return NT_STATUS_OK;
	}

	/* next try via the UnixName attribute */
	s = samdb_result_string(res[0], "unixName", NULL);
	if (s != NULL) {
		struct group *grp = getgrnam(s);
		if (!grp) {
			DEBUG(0,("unixName '%s' for sid %s does not exist as a local group\n", 
				 s, sidstr));
			talloc_free(ctx);
			return NT_STATUS_NO_SUCH_USER;
		}
		*gid = grp->gr_gid;
		talloc_free(ctx);
		return NT_STATUS_OK;
	}

	/* finally try via the sAMAccountName attribute */
	s = samdb_result_string(res[0], "sAMAccountName", NULL);
	if (s != NULL) {
		struct group *grp = getgrnam(s);
		if (!grp) {
			DEBUG(0,("sAMAccountName '%s' for sid %s does not exist as a local group\n", s, sidstr));
			talloc_free(ctx);
			return NT_STATUS_NO_SUCH_USER;
		}
		*gid = grp->gr_gid;
		talloc_free(ctx);
		return NT_STATUS_OK;
	}

allocated_sid:
	status = sidmap_primary_domain_sid(sidmap, ctx, &domain_sid);
	if (!NT_STATUS_IS_OK(status)) {
		talloc_free(ctx);
		return NT_STATUS_NO_SUCH_DOMAIN;
	}

	if (dom_sid_in_domain(domain_sid, sid)) {
		uint32_t rid = sid->sub_auths[sid->num_auths-1];
		if (rid >= SIDMAP_LOCAL_GROUP_BASE) {
			*gid = rid - SIDMAP_LOCAL_GROUP_BASE;
			talloc_free(ctx);
			return NT_STATUS_OK;
		}
	}

	DEBUG(0,("sid_to_unixgid: no unixID, unixName or sAMAccountName for sid %s\n", 
		 sidstr));

	talloc_free(ctx);
	return NT_STATUS_INVALID_SID;
}


/*
  map a unix uid to a dom_sid
  the returned sid is allocated in the supplied mem_ctx
*/
NTSTATUS sidmap_uid_to_sid(struct sidmap_context *sidmap,
			   TALLOC_CTX *mem_ctx,
			   uid_t uid, struct dom_sid **sid)
{
	const char *attrs[] = { "sAMAccountName", "objectSid", "sAMAccountType", NULL };
	int ret, i;
	void *ctx;
	struct ldb_message **res;
	struct passwd *pwd;
	struct dom_sid *domain_sid;
	NTSTATUS status;

	/*
	  we search for the mapping in the following order:

	    - check if the uid is in the dynamic uid range assigned for winbindd
	      use. If it is, then look in winbindd sid mapping
	      database (not implemented yet)
	    - look for a user account in samdb that has unixID set to the
	      given uid
	    - look for a user account in samdb that has unixName or
	      sAMAccountName set to the name given by getpwuid()
	    - assign a SID by adding the uid to SIDMAP_LOCAL_USER_BASE in the local
	      domain
	*/


	ctx = talloc_new(sidmap);


	/*
	  step 2: look for a user account in samdb that has unixID set to the
                  given uid
	*/

	ret = samdb_search(sidmap->samctx, ctx, NULL, &res, attrs, 
			   "unixID=%u", (unsigned int)uid);
	for (i=0;i<ret;i++) {
		const char *sidstr;

		if (!is_user_account(res[i])) continue;

		sidstr = samdb_result_string(res[i], "objectSid", NULL);
		if (sidstr == NULL) continue;

		*sid = dom_sid_parse_talloc(mem_ctx, sidstr);
		talloc_free(ctx);
		if (*sid == NULL) {
			return NT_STATUS_NO_MEMORY;
		}
		return NT_STATUS_OK;
	}

	/*
	  step 3: look for a user account in samdb that has unixName
	          or sAMAccountName set to the name given by getpwuid()
	*/
	pwd = getpwuid(uid);
	if (pwd == NULL) {
		goto allocate_sid;
	}

	ret = samdb_search(sidmap->samctx, ctx, NULL, &res, attrs, 
			   "(|(unixName=%s)(sAMAccountName=%s))", 
			   pwd->pw_name, pwd->pw_name);
	for (i=0;i<ret;i++) {
		const char *sidstr;

		if (!is_user_account(res[i])) continue;

		sidstr = samdb_result_string(res[i], "objectSid", NULL);
		if (sidstr == NULL) continue;

		*sid = dom_sid_parse_talloc(mem_ctx, sidstr);
		talloc_free(ctx);
		if (*sid == NULL) {
			return NT_STATUS_NO_MEMORY;
		}
		return NT_STATUS_OK;
	}


	/*
	    step 4: assign a SID by adding the uid to
	            SIDMAP_LOCAL_USER_BASE in the local domain
	*/
allocate_sid:
	if (uid > SIDMAP_MAX_LOCAL_UID) {
		return NT_STATUS_INVALID_SID;
	}

	status = sidmap_primary_domain_sid(sidmap, mem_ctx, &domain_sid);
	if (!NT_STATUS_IS_OK(status)) {
		talloc_free(ctx);
		return status;
	}

	*sid = dom_sid_add_rid(mem_ctx, domain_sid, SIDMAP_LOCAL_USER_BASE + uid);
	talloc_free(ctx);

	if (*sid == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	return NT_STATUS_OK;
}


/*
  map a unix gid to a dom_sid
  the returned sid is allocated in the supplied mem_ctx
*/
NTSTATUS sidmap_gid_to_sid(struct sidmap_context *sidmap,
			   TALLOC_CTX *mem_ctx,
			   gid_t gid, struct dom_sid **sid)
{
	const char *attrs[] = { "sAMAccountName", "objectSid", "sAMAccountType", NULL };
	int ret, i;
	void *ctx;
	struct ldb_message **res;
	struct group *grp;
	struct dom_sid *domain_sid;
	NTSTATUS status;

	/*
	  we search for the mapping in the following order:

	    - check if the gid is in the dynamic gid range assigned for winbindd
	      use. If it is, then look in winbindd sid mapping
	      database (not implemented yet)
	    - look for a group account in samdb that has unixID set to the
	      given gid
	    - look for a group account in samdb that has unixName or
	      sAMAccountName set to the name given by getgrgid()
	    - assign a SID by adding the gid to SIDMAP_LOCAL_GROUP_BASE in the local
	      domain
	*/


	ctx = talloc_new(sidmap);


	/*
	  step 2: look for a group account in samdb that has unixID set to the
                  given gid
	*/

	ret = samdb_search(sidmap->samctx, ctx, NULL, &res, attrs, 
			   "unixID=%u", (unsigned int)gid);
	for (i=0;i<ret;i++) {
		const char *sidstr;

		if (!is_group_account(res[i])) continue;

		sidstr = samdb_result_string(res[i], "objectSid", NULL);
		if (sidstr == NULL) continue;

		*sid = dom_sid_parse_talloc(mem_ctx, sidstr);
		talloc_free(ctx);
		if (*sid == NULL) {
			return NT_STATUS_NO_MEMORY;
		}
		return NT_STATUS_OK;
	}

	/*
	  step 3: look for a group account in samdb that has unixName
	          or sAMAccountName set to the name given by getgrgid()
	*/
	grp = getgrgid(gid);
	if (grp == NULL) {
		goto allocate_sid;
	}

	ret = samdb_search(sidmap->samctx, ctx, NULL, &res, attrs, 
			   "(|(unixName=%s)(sAMAccountName=%s))", 
			   grp->gr_name, grp->gr_name);
	for (i=0;i<ret;i++) {
		const char *sidstr;

		if (!is_group_account(res[i])) continue;

		sidstr = samdb_result_string(res[i], "objectSid", NULL);
		if (sidstr == NULL) continue;

		*sid = dom_sid_parse_talloc(mem_ctx, sidstr);
		talloc_free(ctx);
		if (*sid == NULL) {
			return NT_STATUS_NO_MEMORY;
		}
		return NT_STATUS_OK;
	}


	/*
	    step 4: assign a SID by adding the gid to
	            SIDMAP_LOCAL_GROUP_BASE in the local domain
	*/
allocate_sid:
	if (gid > SIDMAP_MAX_LOCAL_GID) {
		return NT_STATUS_INVALID_SID;
	}

	status = sidmap_primary_domain_sid(sidmap, mem_ctx, &domain_sid);
	if (!NT_STATUS_IS_OK(status)) {
		talloc_free(ctx);
		return status;
	}

	*sid = dom_sid_add_rid(mem_ctx, domain_sid, SIDMAP_LOCAL_GROUP_BASE + gid);
	talloc_free(ctx);

	if (*sid == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	return NT_STATUS_OK;
}

/*
  check if a sid is in the range of auto-allocated SIDs from our primary domain,
  and if it is, then return the name and atype
*/
NTSTATUS sidmap_allocated_sid_lookup(struct sidmap_context *sidmap, 
				     TALLOC_CTX *mem_ctx, 
				     const struct dom_sid *sid,
				     const char **name,
				     uint32_t *atype)
{
	NTSTATUS status;
	struct dom_sid *domain_sid;
	void *ctx = talloc_new(mem_ctx);
	uint32_t rid;

	status = sidmap_primary_domain_sid(sidmap, ctx, &domain_sid);
	if (!NT_STATUS_IS_OK(status)) {
		return NT_STATUS_NO_SUCH_DOMAIN;
	}

	if (!dom_sid_in_domain(domain_sid, sid)) {
		talloc_free(ctx);
		return NT_STATUS_INVALID_SID;
	}

	talloc_free(ctx);

	rid = sid->sub_auths[sid->num_auths-1];
	if (rid < SIDMAP_LOCAL_USER_BASE) {
		return NT_STATUS_INVALID_SID;
	}

	if (rid < SIDMAP_LOCAL_GROUP_BASE) {
		struct passwd *pwd;
		uid_t uid = rid - SIDMAP_LOCAL_USER_BASE;
		*atype = ATYPE_NORMAL_ACCOUNT;
		pwd = getpwuid(uid);
		if (pwd == NULL) {
			*name = talloc_asprintf(mem_ctx, "uid%u", uid);
		} else {
			*name = talloc_strdup(mem_ctx, pwd->pw_name);
		}
	} else {
		struct group *grp;
		gid_t gid = rid - SIDMAP_LOCAL_GROUP_BASE;
		*atype = ATYPE_LOCAL_GROUP;
		grp = getgrgid(gid);
		if (grp == NULL) {
			*name = talloc_asprintf(mem_ctx, "gid%u", gid);
		} else {
			*name = talloc_strdup(mem_ctx, grp->gr_name);
		}
	}

	if (*name == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	return NT_STATUS_OK;
}