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s3:smb2_read: let smb2_sendfile_send_data() behave like send_file_readX()
[Samba.git] / source3 / winbindd / idmap_autorid.c
blob57d952e94ae7fbb1d886f743e2bfe968c742f644
1 /*
2 * idmap_autorid: static map between Active Directory/NT RIDs
3 * and RFC 2307 accounts
4 *
5 * based on the idmap_rid module, but this module defines the ranges
6 * for the domains by automatically allocating a range for each domain
7 *
8 * Copyright (C) Christian Ambach, 2010-2012
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 3 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, see <http://www.gnu.org/licenses/>.
22 *
23 */
24
25 /*
26 * This module allocates ranges for domains to be used in a
27 * algorithmic mode like idmap_rid. Multiple ranges are supported
28 * for a single domain: If a rid exceeds the range size, a matching
29 * range is allocated to hold the rid's id.
30 *
31 * Here are the formulas applied:
32 *
33 *
34 * For a sid of the form domain_sid-rid, we have
35 *
36 * rid = reduced_rid + domain_range_index * range_size
37 *
38 * with
39 * reduced_rid := rid % range_size
40 * domain_range_index := rid / range_size
41 *
42 * And reduced_rid fits into a range.
43 *
44 * In the database, we associate a range_number to
45 * the pair domain_sid,domain_range_index.
46 *
47 * Now the unix id for the given sid calculates as:
48 *
49 * id = reduced_rid + range_low_id
50 *
51 * with
52 *
53 * range_low_id = low_id + range_number * range_size
54 *
55 *
56 * The inverse calculation goes like this:
57 *
58 * Given a unix id, let
59 *
60 * normalized_id := id - low_id
61 * reduced_rid := normalized_id % range_size
62 * range_number = normalized_id / range_size
63 *
64 * Then we have
65 *
66 * id = reduced_rid + low_id + range_number * range_size
67 *
68 * From the database, get the domain_sid,domain_range_index pair
69 * belonging to the range_number (if there is already one).
70 *
71 * Then the rid for the unix id calculates as:
72 *
73 * rid = reduced_rid + domain_range_index * range_size
74 */
75
76 #include "includes.h"
77 #include "system/filesys.h"
78 #include "winbindd.h"
79 #include "dbwrap/dbwrap.h"
80 #include "dbwrap/dbwrap_open.h"
81 #include "idmap.h"
82 #include "idmap_rw.h"
83 #include "../libcli/security/dom_sid.h"
84 #include "util_tdb.h"
85 #include "winbindd/idmap_tdb_common.h"
86
87 #undef DBGC_CLASS
88 #define DBGC_CLASS DBGC_IDMAP
89
90 #define HWM "NEXT RANGE"
91 #define ALLOC_HWM_UID "NEXT ALLOC UID"
92 #define ALLOC_HWM_GID "NEXT ALLOC GID"
93 #define ALLOC_RANGE "ALLOC"
94 #define CONFIGKEY "CONFIG"
95
96 struct autorid_global_config {
97 uint32_t minvalue;
98 uint32_t rangesize;
99 uint32_t maxranges;
100 bool ignore_builtin;
101 };
102
103 struct autorid_range_config {
104 fstring domsid;
105 fstring keystr;
106 uint32_t rangenum;
107 uint32_t domain_range_index;
108 uint32_t low_id;
109 struct autorid_global_config *globalcfg;
110 };
111
112 /* handle to the tdb storing domain <-> range assignments */
113 static struct db_context *autorid_db;
114
115 static NTSTATUS idmap_autorid_get_domainrange_action(struct db_context *db,
116 void *private_data)
117 {
118 NTSTATUS ret;
119 uint32_t rangenum, hwm;
120 char *numstr;
121 struct autorid_range_config *range;
122
123 range = (struct autorid_range_config *)private_data;
124
125 ret = dbwrap_fetch_uint32_bystring(db, range->keystr,
126 &(range->rangenum));
127
128 if (NT_STATUS_IS_OK(ret)) {
129 /* entry is already present*/
130 return ret;
131 }
132
133 DEBUG(10, ("Acquiring new range for domain %s "
134 "(domain_range_index=%"PRIu32")\n",
135 range->domsid, range->domain_range_index));
136
137 /* fetch the current HWM */
138 ret = dbwrap_fetch_uint32_bystring(db, HWM, &hwm);
139 if (!NT_STATUS_IS_OK(ret)) {
140 DEBUG(1, ("Fatal error while fetching current "
141 "HWM value: %s\n", nt_errstr(ret)));
142 ret = NT_STATUS_INTERNAL_ERROR;
143 goto error;
144 }
145
146 /* do we have a range left? */
147 if (hwm >= range->globalcfg->maxranges) {
148 DEBUG(1, ("No more domain ranges available!\n"));
149 ret = NT_STATUS_NO_MEMORY;
150 goto error;
151 }
152
153 /* increase the HWM */
154 ret = dbwrap_change_uint32_atomic_bystring(db, HWM, &rangenum, 1);
155 if (!NT_STATUS_IS_OK(ret)) {
156 DEBUG(1, ("Fatal error while fetching a new "
157 "domain range value!\n"));
158 goto error;
159 }
160
161 /* store away the new mapping in both directions */
162 ret = dbwrap_store_uint32_bystring(db, range->keystr, rangenum);
163 if (!NT_STATUS_IS_OK(ret)) {
164 DEBUG(1, ("Fatal error while storing new "
165 "domain->range assignment!\n"));
166 goto error;
167 }
168
169 numstr = talloc_asprintf(db, "%u", rangenum);
170 if (!numstr) {
171 ret = NT_STATUS_NO_MEMORY;
172 goto error;
173 }
174
175 ret = dbwrap_store_bystring(db, numstr,
176 string_term_tdb_data(range->keystr), TDB_INSERT);
177
178 talloc_free(numstr);
179 if (!NT_STATUS_IS_OK(ret)) {
180 DEBUG(1, ("Fatal error while storing "
181 "new domain->range assignment!\n"));
182 goto error;
183 }
184 DEBUG(5, ("Acquired new range #%d for domain %s "
185 "(domain_range_index=%"PRIu32")\n", rangenum, range->keystr,
186 range->domain_range_index));
187
188 range->rangenum = rangenum;
189
190 return NT_STATUS_OK;
191
192 error:
193 return ret;
194
195 }
196
197 static NTSTATUS idmap_autorid_get_domainrange(struct autorid_range_config *range,
198 bool read_only)
199 {
200 NTSTATUS ret;
201
202 /*
203 * try to find mapping without locking the database,
204 * if it is not found create a mapping in a transaction unless
205 * read-only mode has been set
206 */
207 if (range->domain_range_index > 0) {
208 snprintf(range->keystr, FSTRING_LEN, "%s#%"PRIu32,
209 range->domsid, range->domain_range_index);
210 } else {
211 fstrcpy(range->keystr, range->domsid);
212 }
213
214 ret = dbwrap_fetch_uint32_bystring(autorid_db, range->keystr,
215 &(range->rangenum));
216
217 if (!NT_STATUS_IS_OK(ret)) {
218 if (read_only) {
219 return NT_STATUS_NOT_FOUND;
220 }
221 ret = dbwrap_trans_do(autorid_db,
222 idmap_autorid_get_domainrange_action, range);
223 }
224
225 range->low_id = range->globalcfg->minvalue
226 + range->rangenum * range->globalcfg->rangesize;
227
228 DEBUG(10, ("Using range #%d for domain %s "
229 "(domain_range_index=%"PRIu32", low_id=%"PRIu32")\n",
230 range->rangenum, range->domsid, range->domain_range_index,
231 range->low_id));
232
233 return ret;
234 }
235
236 static NTSTATUS idmap_autorid_allocate_id(struct idmap_domain *dom,
237 struct unixid *xid) {
238
239 NTSTATUS ret;
240 struct idmap_tdb_common_context *commoncfg;
241 struct autorid_global_config *globalcfg;
242 struct autorid_range_config range;
243
244 commoncfg =
245 talloc_get_type_abort(dom->private_data,
246 struct idmap_tdb_common_context);
247
248 globalcfg = talloc_get_type(commoncfg->private_data,
249 struct autorid_global_config);
250
251 if (dom->read_only) {
252 DEBUG(3, ("Backend is read-only, refusing "
253 "new allocation request\n"));
254 return NT_STATUS_UNSUCCESSFUL;
255 }
256
257 /* fetch the range for the allocation pool */
258
259 ZERO_STRUCT(range);
260
261 range.globalcfg = globalcfg;
262 fstrcpy(range.domsid, ALLOC_RANGE);
263
264 ret = idmap_autorid_get_domainrange(&range, dom->read_only);
265
266 if (!NT_STATUS_IS_OK(ret)) {
267 DEBUG(3, ("Could not determine range for allocation pool, "
268 "check previous messages for reason\n"));
269 return ret;
270 }
271
272 ret = idmap_tdb_common_get_new_id(dom, xid);
273
274 if (!NT_STATUS_IS_OK(ret)) {
275 DEBUG(1, ("Fatal error while allocating new ID!\n"));
276 return ret;
277 }
278
279 xid->id = xid->id + range.low_id;
280
281 DEBUG(10, ("Returned new %s %d from allocation range\n",
282 (xid->type==ID_TYPE_UID)?"uid":"gid", xid->id));
283
284 return ret;
285 }
286
287 /*
288 * map a SID to xid using the idmap_tdb like pool
289 */
290 static NTSTATUS idmap_autorid_map_id_to_sid(struct idmap_domain *dom,
291 struct id_map *map)
292 {
293 NTSTATUS ret;
294
295 /* look out for the mapping */
296 ret = idmap_tdb_common_unixid_to_sid(dom, map);
297
298 if (NT_STATUS_IS_OK(ret)) {
299 map->status = ID_MAPPED;
300 return ret;
301 }
302
303 map->status = ID_UNKNOWN;
304
305 DEBUG(10, ("no ID->SID mapping for %d could be found\n", map->xid.id));
306
307 return ret;
308 }
309
310 static NTSTATUS idmap_autorid_id_to_sid(struct autorid_global_config *cfg,
311 struct idmap_domain *dom,
312 struct id_map *map)
313 {
314 uint32_t range_number;
315 uint32_t domain_range_index = 0;
316 uint32_t normalized_id;
317 uint32_t reduced_rid;
318 uint32_t rid;
319 TDB_DATA data = tdb_null;
320 char *keystr;
321 struct dom_sid domsid;
322 NTSTATUS status;
323 bool ok;
324 const char *q = NULL;
325
326 /* can this be one of our ids? */
327 if (map->xid.id < cfg->minvalue) {
328 DEBUG(10, ("id %d is lower than minimum value, "
329 "ignoring mapping request\n", map->xid.id));
330 map->status = ID_UNKNOWN;
331 return NT_STATUS_OK;
332 }
333
334 if (map->xid.id > (cfg->minvalue + cfg->rangesize * cfg->maxranges)) {
335 DEBUG(10, ("id %d is outside of maximum id value, "
336 "ignoring mapping request\n", map->xid.id));
337 map->status = ID_UNKNOWN;
338 return NT_STATUS_OK;
339 }
340
341 /* determine the range of this uid */
342
343 normalized_id = map->xid.id - cfg->minvalue;
344 range_number = normalized_id / cfg->rangesize;
345
346 keystr = talloc_asprintf(talloc_tos(), "%u", range_number);
347 if (!keystr) {
348 return NT_STATUS_NO_MEMORY;
349 }
350
351 status = dbwrap_fetch_bystring(autorid_db, talloc_tos(), keystr, &data);
352 TALLOC_FREE(keystr);
353
354 if (!NT_STATUS_IS_OK(status)) {
355 DEBUG(4, ("id %d belongs to range %d which does not have "
356 "domain mapping, ignoring mapping request\n",
357 map->xid.id, range_number));
358 TALLOC_FREE(data.dptr);
359 map->status = ID_UNKNOWN;
360 return NT_STATUS_OK;
361 }
362
363 if (strncmp((const char *)data.dptr,
364 ALLOC_RANGE,
365 strlen(ALLOC_RANGE)) == 0) {
366 /*
367 * this is from the alloc range, check if there is a mapping
368 */
369 DEBUG(5, ("id %d belongs to allocation range, "
370 "checking for mapping\n",
371 map->xid.id));
372 TALLOC_FREE(data.dptr);
373 return idmap_autorid_map_id_to_sid(dom, map);
374 }
375
376 ok = dom_sid_parse_endp((const char *)data.dptr, &domsid, &q);
377 TALLOC_FREE(data.dptr);
378 if (!ok) {
379 map->status = ID_UNKNOWN;
380 return NT_STATUS_OK;
381 }
382 if ((q != NULL) && (*q != '\0'))
383 if (sscanf(q+1, "%"SCNu32, &domain_range_index) != 1) {
384 DEBUG(10, ("Domain range index not found, "
385 "ignoring mapping request\n"));
386 map->status = ID_UNKNOWN;
387 return NT_STATUS_OK;
388 }
389
390 reduced_rid = normalized_id % cfg->rangesize;
391 rid = reduced_rid + domain_range_index * cfg->rangesize;
392
393 sid_compose(map->sid, &domsid, rid);
394
395 /* We **really** should have some way of validating
396 the SID exists and is the correct type here. But
397 that is a deficiency in the idmap_rid design. */
398
399 map->status = ID_MAPPED;
400 map->xid.type = ID_TYPE_BOTH;
401
402 return NT_STATUS_OK;
403 }
404
405 /**********************************
406 Single sid to id lookup function.
407 **********************************/
408
409 static NTSTATUS idmap_autorid_sid_to_id(struct autorid_global_config *global,
410 struct autorid_range_config *range,
411 struct id_map *map)
412 {
413 uint32_t rid;
414 uint32_t reduced_rid;
415
416 sid_peek_rid(map->sid, &rid);
417
418 reduced_rid = rid % global->rangesize;
419
420 map->xid.id = reduced_rid + range->low_id;
421 map->xid.type = ID_TYPE_BOTH;
422
423 /* We **really** should have some way of validating
424 the SID exists and is the correct type here. But
425 that is a deficiency in the idmap_rid design. */
426
427 map->status = ID_MAPPED;
428
429 return NT_STATUS_OK;
430 }
431
432 /**********************************
433 lookup a set of unix ids.
434 **********************************/
435
436 static NTSTATUS idmap_autorid_unixids_to_sids(struct idmap_domain *dom,
437 struct id_map **ids)
438 {
439 struct idmap_tdb_common_context *commoncfg;
440 struct autorid_global_config *globalcfg;
441 NTSTATUS ret;
442 int i;
443 int num_tomap = 0;
444 int num_mapped = 0;
445
446 /* initialize the status to avoid surprise */
447 for (i = 0; ids[i]; i++) {
448 ids[i]->status = ID_UNKNOWN;
449 num_tomap++;
450 }
451
452 commoncfg =
453 talloc_get_type_abort(dom->private_data,
454 struct idmap_tdb_common_context);
455
456 globalcfg = talloc_get_type(commoncfg->private_data,
457 struct autorid_global_config);
458
459 for (i = 0; ids[i]; i++) {
460
461 ret = idmap_autorid_id_to_sid(globalcfg, dom, ids[i]);
462
463 if ((!NT_STATUS_IS_OK(ret)) &&
464 (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
465 /* some fatal error occurred, log it */
466 DEBUG(3, ("Unexpected error resolving an ID "
467 " (%d)\n", ids[i]->xid.id));
468 goto failure;
469 }
470
471 if (NT_STATUS_IS_OK(ret) && ids[i]->status == ID_MAPPED) {
472 num_mapped++;
473 }
474
475 }
476
477 if (num_tomap == num_mapped) {
478 return NT_STATUS_OK;
479 } else if (num_mapped == 0) {
480 return NT_STATUS_NONE_MAPPED;
481 }
482
483 return STATUS_SOME_UNMAPPED;
484
485
486 failure:
487 return ret;
488 }
489
490 /*
491 * map a SID to xid using the idmap_tdb like pool
492 */
493 static NTSTATUS idmap_autorid_map_sid_to_id(struct idmap_domain *dom,
494 struct id_map *map,
495 struct idmap_tdb_common_context *ctx)
496 {
497 NTSTATUS ret;
498 int res;
499
500 /* see if we already have a mapping */
501 ret = idmap_tdb_common_sid_to_unixid(dom, map);
502
503 if (NT_STATUS_IS_OK(ret)) {
504 map->status = ID_MAPPED;
505 return ret;
506 }
507
508 /* bad things happened */
509 if (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
510 DEBUG(1, ("Looking up SID->ID mapping for %s failed\n",
511 sid_string_dbg(map->sid)));
512 return ret;
513 }
514
515 if (dom->read_only) {
516 DEBUG(3, ("Not allocating new mapping for %s, because backend "
517 "is read-only\n", sid_string_dbg(map->sid)));
518 return NT_STATUS_NONE_MAPPED;
519 }
520
521 DEBUG(10, ("Creating new mapping in pool for %s\n",
522 sid_string_dbg(map->sid)));
523
524 /* create new mapping */
525 res = dbwrap_transaction_start(ctx->db);
526 if (res != 0) {
527 DEBUG(2, ("transaction_start failed\n"));
528 return NT_STATUS_INTERNAL_DB_CORRUPTION;
529 }
530
531 ret = idmap_tdb_common_new_mapping(dom, map);
532
533 map->status = (NT_STATUS_IS_OK(ret))?ID_MAPPED:ID_UNMAPPED;
534
535 if (!NT_STATUS_IS_OK(ret)) {
536 if (dbwrap_transaction_cancel(ctx->db) != 0) {
537 smb_panic("Cancelling transaction failed");
538 }
539 return ret;
540 }
541
542 res = dbwrap_transaction_commit(ctx->db);
543 if (res == 0) {
544 return ret;
545 }
546
547 DEBUG(2, ("transaction_commit failed\n"));
548 return NT_STATUS_INTERNAL_DB_CORRUPTION;
549
550 }
551
552 /**********************************
553 lookup a set of sids.
554 **********************************/
555
556 static NTSTATUS idmap_autorid_sids_to_unixids(struct idmap_domain *dom,
557 struct id_map **ids)
558 {
559 struct idmap_tdb_common_context *commoncfg;
560 struct autorid_global_config *global;
561 NTSTATUS ret;
562 int i;
563 int num_tomap = 0;
564 int num_mapped = 0;
565
566 /* initialize the status to avoid surprise */
567 for (i = 0; ids[i]; i++) {
568 ids[i]->status = ID_UNKNOWN;
569 num_tomap++;
570 }
571
572 commoncfg =
573 talloc_get_type_abort(dom->private_data,
574 struct idmap_tdb_common_context);
575
576 global = talloc_get_type(commoncfg->private_data,
577 struct autorid_global_config);
578
579 for (i = 0; ids[i]; i++) {
580 struct winbindd_tdc_domain *domain;
581 struct autorid_range_config range;
582 uint32_t rid;
583 struct dom_sid domainsid;
584
585 ZERO_STRUCT(range);
586
587 DEBUG(10, ("Trying to map %s\n", sid_string_dbg(ids[i]->sid)));
588
589 sid_copy(&domainsid, ids[i]->sid);
590 if (!sid_split_rid(&domainsid, &rid)) {
591 DEBUG(4, ("Could not determine domain SID from %s, "
592 "ignoring mapping request\n",
593 sid_string_dbg(ids[i]->sid)));
594 continue;
595 }
596
597 /* is this a well-known SID? */
598
599 if (sid_check_is_wellknown_domain(&domainsid, NULL)) {
600
601 DEBUG(10, ("SID %s is well-known, using pool\n",
602 sid_string_dbg(ids[i]->sid)));
603
604 ret = idmap_autorid_map_sid_to_id(dom, ids[i],
605 commoncfg);
606
607 if (!NT_STATUS_IS_OK(ret) &&
608 !NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
609 DEBUG(3, ("Unexpected error resolving "
610 "SID (%s)\n",
611 sid_string_dbg(ids[i]->sid)));
612 goto failure;
613 }
614
615 if (ids[i]->status == ID_MAPPED) {
616 num_mapped++;
617 }
618
619 continue;
620 }
621
622 /* BUILTIN is passdb's job */
623 if (dom_sid_equal(&domainsid, &global_sid_Builtin) &&
624 global->ignore_builtin) {
625 DEBUG(10, ("Ignoring request for BUILTIN domain\n"));
626 continue;
627 }
628
629 /*
630 * Check if the domain is around
631 */
632 domain = wcache_tdc_fetch_domainbysid(talloc_tos(),
633 &domainsid);
634 if (domain == NULL) {
635 DEBUG(10, ("Ignoring unknown domain sid %s\n",
636 sid_string_dbg(&domainsid)));
637 continue;
638 }
639 TALLOC_FREE(domain);
640
641 range.globalcfg = global;
642 sid_to_fstring(range.domsid, &domainsid);
643
644 /* Calculate domain_range_index for multi-range support */
645 range.domain_range_index = rid / (global->rangesize);
646
647 ret = idmap_autorid_get_domainrange(&range, dom->read_only);
648
649 /* read-only mode and a new domain range would be required? */
650 if (NT_STATUS_EQUAL(ret, NT_STATUS_NOT_FOUND) &&
651 dom->read_only) {
652 DEBUG(10, ("read-only is enabled, did not allocate "
653 "new range for domain %s\n",
654 sid_string_dbg(&domainsid)));
655 continue;
656 }
657
658 if (!NT_STATUS_IS_OK(ret)) {
659 DEBUG(3, ("Could not determine range for domain, "
660 "check previous messages for reason\n"));
661 goto failure;
662 }
663
664 ret = idmap_autorid_sid_to_id(global, &range, ids[i]);
665
666 if ((!NT_STATUS_IS_OK(ret)) &&
667 (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
668 /* some fatal error occurred, log it */
669 DEBUG(3, ("Unexpected error resolving a SID (%s)\n",
670 sid_string_dbg(ids[i]->sid)));
671 goto failure;
672 }
673
674 if (NT_STATUS_IS_OK(ret)) {
675 num_mapped++;
676 }
677 }
678
679 if (num_tomap == num_mapped) {
680 return NT_STATUS_OK;
681 } else if (num_mapped == 0) {
682 return NT_STATUS_NONE_MAPPED;
683 }
684
685 return STATUS_SOME_UNMAPPED;
686
687 failure:
688 return ret;
689
690 }
691
692 /* initialize the given HWM to 0 if it does not exist yet */
693 static NTSTATUS idmap_autorid_init_hwm(const char *hwm) {
694
695 NTSTATUS status;
696 uint32_t hwmval;
697
698 status = dbwrap_fetch_uint32_bystring(autorid_db, hwm, &hwmval);
699 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
700 status = dbwrap_trans_store_int32_bystring(autorid_db, hwm, 0);
701 if (!NT_STATUS_IS_OK(status)) {
702 DEBUG(0,
703 ("Unable to initialise HWM (%s) in autorid "
704 "database: %s\n", hwm, nt_errstr(status)));
705 return NT_STATUS_INTERNAL_DB_ERROR;
706 }
707 } else if (!NT_STATUS_IS_OK(status)) {
708 DEBUG(0, ("unable to fetch HWM (%s) from autorid "
709 "database: %s\n", hwm, nt_errstr(status)));
710 return status;
711 }
712
713 return NT_STATUS_OK;
714 }
715
716 /*
717 * open and initialize the database which stores the ranges for the domains
718 */
719 static NTSTATUS idmap_autorid_db_init(void)
720 {
721 NTSTATUS status;
722
723 if (autorid_db) {
724 /* its already open */
725 return NT_STATUS_OK;
726 }
727
728 /* Open idmap repository */
729 autorid_db = db_open(NULL, state_path("autorid.tdb"), 0,
730 TDB_DEFAULT, O_RDWR | O_CREAT, 0644,
731 DBWRAP_LOCK_ORDER_1);
732
733 if (!autorid_db) {
734 DEBUG(0, ("Unable to open idmap_autorid database '%s'\n",
735 state_path("autorid.tdb")));
736 return NT_STATUS_UNSUCCESSFUL;
737 }
738
739 /* Initialize high water mark for the currently used range to 0 */
740
741 status = idmap_autorid_init_hwm(HWM);
742 NT_STATUS_NOT_OK_RETURN(status);
743
744 status = idmap_autorid_init_hwm(ALLOC_HWM_UID);
745 NT_STATUS_NOT_OK_RETURN(status);
746
747 status = idmap_autorid_init_hwm(ALLOC_HWM_GID);
748
749 return status;
750 }
751
752 static struct autorid_global_config *idmap_autorid_loadconfig(TALLOC_CTX * ctx)
753 {
754
755 TDB_DATA data;
756 struct autorid_global_config *cfg;
757 unsigned long minvalue, rangesize, maxranges;
758 NTSTATUS status;
759
760 status = dbwrap_fetch_bystring(autorid_db, ctx, CONFIGKEY, &data);
761
762 if (!NT_STATUS_IS_OK(status)) {
763 DEBUG(10, ("No saved config found\n"));
764 return NULL;
765 }
766
767 cfg = talloc_zero(ctx, struct autorid_global_config);
768 if (!cfg) {
769 return NULL;
770 }
771
772 if (sscanf((char *)data.dptr,
773 "minvalue:%lu rangesize:%lu maxranges:%lu",
774 &minvalue, &rangesize, &maxranges) != 3) {
775 DEBUG(1,
776 ("Found invalid configuration data"
777 "creating new config\n"));
778 return NULL;
779 }
780
781 cfg->minvalue = minvalue;
782 cfg->rangesize = rangesize;
783 cfg->maxranges = maxranges;
784
785 DEBUG(10, ("Loaded previously stored configuration "
786 "minvalue:%d rangesize:%d\n",
787 cfg->minvalue, cfg->rangesize));
788
789 return cfg;
790
791 }
792
793 static NTSTATUS idmap_autorid_saveconfig(struct autorid_global_config *cfg)
794 {
795
796 NTSTATUS status;
797 TDB_DATA data;
798 char *cfgstr;
799
800 cfgstr =
801 talloc_asprintf(talloc_tos(),
802 "minvalue:%u rangesize:%u maxranges:%u",
803 cfg->minvalue, cfg->rangesize, cfg->maxranges);
804
805 if (!cfgstr) {
806 return NT_STATUS_NO_MEMORY;
807 }
808
809 data = string_tdb_data(cfgstr);
810
811 status = dbwrap_trans_store_bystring(autorid_db, CONFIGKEY,
812 data, TDB_REPLACE);
813
814 talloc_free(cfgstr);
815
816 return status;
817 }
818
819 static NTSTATUS idmap_autorid_preallocate_wellknown(struct idmap_domain *dom)
820 {
821 const char *groups[] = { "S-1-1-0", "S-1-2-0", "S-1-2-1",
822 "S-1-3-0", "S-1-3-1", "S-1-3-2", "S-1-3-3", "S-1-3-4",
823 "S-1-5-1", "S-1-5-2", "S-1-5-3", "S-1-5-4", "S-1-5-6",
824 "S-1-5-7", "S-1-5-8", "S-1-5-9", "S-1-5-10", "S-1-5-11",
825 "S-1-5-12", "S-1-5-13", "S-1-5-14", "S-1-5-15",
826 "S-1-5-17", "S-1-5-18", "S-1-5-19", "S-1-5-20"
827 };
828
829 struct id_map **maps;
830 int i, num;
831 NTSTATUS status;
832
833 if (dom->read_only) {
834 return NT_STATUS_OK;
835 }
836
837 num = sizeof(groups)/sizeof(char*);
838
839 maps = talloc_zero_array(talloc_tos(), struct id_map*, num+1);
840 if (!maps) {
841 return NT_STATUS_NO_MEMORY;
842 }
843
844 for (i = 0; i < num; i++) {
845 maps[i] = talloc(maps, struct id_map);
846 maps[i]->xid.type = ID_TYPE_GID;
847 maps[i]->sid = dom_sid_parse_talloc(maps, groups[i]);
848 }
849
850 maps[num] = NULL;
851
852 status = idmap_autorid_sids_to_unixids(dom, maps);
853
854 DEBUG(10,("Preallocation run finished with status %s\n",
855 nt_errstr(status)));
856
857 talloc_free(maps);
858
859 return NT_STATUS_IS_OK(status)?NT_STATUS_OK:NT_STATUS_UNSUCCESSFUL;
860 }
861
862 static NTSTATUS idmap_autorid_initialize(struct idmap_domain *dom)
863 {
864 struct idmap_tdb_common_context *commonconfig;
865 struct autorid_global_config *config;
866 struct autorid_global_config *storedconfig = NULL;
867 NTSTATUS status;
868 uint32_t hwm;
869
870 if (!strequal(dom->name, "*")) {
871 DEBUG(0, ("idmap_autorid_initialize: Error: autorid configured "
872 "for domain '%s'. But autorid can only be used for "
873 "the default idmap configuration.\n", dom->name));
874 return NT_STATUS_INVALID_PARAMETER;
875 }
876
877 commonconfig = talloc_zero(dom, struct idmap_tdb_common_context);
878 if (!commonconfig) {
879 DEBUG(0, ("Out of memory!\n"));
880 return NT_STATUS_NO_MEMORY;
881 }
882
883 commonconfig->rw_ops = talloc_zero(commonconfig, struct idmap_rw_ops);
884 if (commonconfig->rw_ops == NULL) {
885 DEBUG(0, ("Out of memory!\n"));
886 return NT_STATUS_NO_MEMORY;
887 }
888
889 config = talloc_zero(commonconfig, struct autorid_global_config);
890 if (!config) {
891 DEBUG(0, ("Out of memory!\n"));
892 return NT_STATUS_NO_MEMORY;
893 }
894
895 status = idmap_autorid_db_init();
896 if (!NT_STATUS_IS_OK(status)) {
897 goto error;
898 }
899
900 config->minvalue = dom->low_id;
901 config->rangesize = lp_parm_int(-1, "idmap config *",
902 "rangesize", 100000);
903
904 if (config->rangesize < 2000) {
905 DEBUG(1, ("autorid rangesize must be at least 2000\n"));
906 status = NT_STATUS_INVALID_PARAMETER;
907 goto error;
908 }
909
910 config->maxranges = (dom->high_id - dom->low_id + 1) /
911 config->rangesize;
912
913 if (config->maxranges == 0) {
914 DEBUG(1, ("allowed uid range is smaller then rangesize, "
915 "increase uid range or decrease rangesize\n"));
916 status = NT_STATUS_INVALID_PARAMETER;
917 goto error;
918 }
919
920 /* check if the high-low limit is a multiple of the rangesize */
921 if ((dom->high_id - dom->low_id + 1) % config->rangesize != 0) {
922 DEBUG(5, ("High uid-low uid difference of %d "
923 "is not a multiple of the rangesize %d, "
924 "limiting ranges to lower boundary number of %d\n",
925 (dom->high_id - dom->low_id + 1), config->rangesize,
926 config->maxranges));
927 }
928
929 DEBUG(10, ("Current configuration in config is "
930 "minvalue:%d rangesize:%d maxranges:%d\n",
931 config->minvalue, config->rangesize, config->maxranges));
932
933 /* read previously stored config and current HWM */
934 storedconfig = idmap_autorid_loadconfig(talloc_tos());
935
936 status = dbwrap_fetch_uint32_bystring(autorid_db, HWM, &hwm);
937 if (!NT_STATUS_IS_OK(status)) {
938 DEBUG(1, ("Fatal error while fetching current "
939 "HWM value: %s\n", nt_errstr(status)));
940 status = NT_STATUS_INTERNAL_ERROR;
941 goto error;
942 }
943
944 /* did the minimum value or rangesize change? */
945 if (storedconfig &&
946 ((storedconfig->minvalue != config->minvalue) ||
947 (storedconfig->rangesize != config->rangesize))) {
948 DEBUG(1, ("New configuration values for rangesize or "
949 "minimum uid value conflict with previously "
950 "used values! Aborting initialization\n"));
951 status = NT_STATUS_INVALID_PARAMETER;
952 goto error;
953 }
954
955 /*
956 * has the highest uid value been reduced to setting that is not
957 * sufficient any more for already existing ranges?
958 */
959 if (hwm > config->maxranges) {
960 DEBUG(1, ("New upper uid limit is too low to cover "
961 "existing mappings! Aborting initialization\n"));
962 status = NT_STATUS_INVALID_PARAMETER;
963 goto error;
964 }
965
966 status = idmap_autorid_saveconfig(config);
967
968 if (!NT_STATUS_IS_OK(status)) {
969 DEBUG(1, ("Failed to store configuration data!\n"));
970 goto error;
971 }
972
973 DEBUG(5, ("%d domain ranges with a size of %d are available\n",
974 config->maxranges, config->rangesize));
975
976 config->ignore_builtin = lp_parm_bool(-1, "idmap config *",
977 "ignore builtin", false);
978
979 /* fill the TDB common configuration */
980 commonconfig->private_data = config;
981
982 commonconfig->db = autorid_db;
983 commonconfig->max_id = config->rangesize -1;
984 commonconfig->hwmkey_uid = ALLOC_HWM_UID;
985 commonconfig->hwmkey_gid = ALLOC_HWM_GID;
986 commonconfig->rw_ops->get_new_id = idmap_autorid_allocate_id;
987 commonconfig->rw_ops->set_mapping = idmap_tdb_common_set_mapping;
988
989 dom->private_data = commonconfig;
990
991 /* preallocate well-known SIDs in the pool */
992 status = idmap_autorid_preallocate_wellknown(dom);
993
994 goto done;
995
996 error:
997 talloc_free(config);
998
999 done:
1000 talloc_free(storedconfig);
1001
1002 return status;
1003 }
1004
1005 /*
1006 Close the idmap tdb instance
1007 */
1008 static struct idmap_methods autorid_methods = {
1009 .init = idmap_autorid_initialize,
1010 .unixids_to_sids = idmap_autorid_unixids_to_sids,
1011 .sids_to_unixids = idmap_autorid_sids_to_unixids,
1012 .allocate_id = idmap_autorid_allocate_id
1013 };
1014
1015 NTSTATUS samba_init_module(void)
1016 {
1017 return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
1018 "autorid", &autorid_methods);
1019 }
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