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util: Remove 32bit macros breaking strict aliasing.
[Samba.git] / source3 / winbindd / idmap_autorid.c
blob306b17693ebe4d47e8aaee5035b94b1af8875db0
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 #include "includes.h"
26 #include "system/filesys.h"
27 #include "winbindd.h"
28 #include "dbwrap/dbwrap.h"
29 #include "dbwrap/dbwrap_open.h"
30 #include "idmap.h"
31 #include "idmap_rw.h"
32 #include "../libcli/security/dom_sid.h"
33 #include "util_tdb.h"
34 #include "winbindd/idmap_tdb_common.h"
35
36 #undef DBGC_CLASS
37 #define DBGC_CLASS DBGC_IDMAP
38
39 #define HWM "NEXT RANGE"
40 #define ALLOC_HWM_UID "NEXT ALLOC UID"
41 #define ALLOC_HWM_GID "NEXT ALLOC GID"
42 #define ALLOC_RANGE "ALLOC"
43 #define CONFIGKEY "CONFIG"
44
45 struct autorid_global_config {
46 uint32_t minvalue;
47 uint32_t rangesize;
48 uint32_t maxranges;
49 bool ignore_builtin;
50 };
51
52 struct autorid_domain_config {
53 fstring sid;
54 uint32_t domainnum;
55 struct autorid_global_config *globalcfg;
56 };
57
58 /* handle to the tdb storing domain <-> range assignments */
59 static struct db_context *autorid_db;
60
61 static NTSTATUS idmap_autorid_get_domainrange_action(struct db_context *db,
62 void *private_data)
63 {
64 NTSTATUS ret;
65 uint32_t domainnum, hwm;
66 char *numstr;
67 struct autorid_domain_config *cfg;
68
69 cfg = (struct autorid_domain_config *)private_data;
70
71 ret = dbwrap_fetch_uint32_bystring(db, cfg->sid, &(cfg->domainnum));
72
73 if (NT_STATUS_IS_OK(ret)) {
74 /* entry is already present*/
75 return ret;
76 }
77
78 DEBUG(10, ("Acquiring new range for domain %s\n", cfg->sid));
79
80 /* fetch the current HWM */
81 ret = dbwrap_fetch_uint32_bystring(db, HWM, &hwm);
82 if (!NT_STATUS_IS_OK(ret)) {
83 DEBUG(1, ("Fatal error while fetching current "
84 "HWM value: %s\n", nt_errstr(ret)));
85 ret = NT_STATUS_INTERNAL_ERROR;
86 goto error;
87 }
88
89 /* do we have a range left? */
90 if (hwm >= cfg->globalcfg->maxranges) {
91 DEBUG(1, ("No more domain ranges available!\n"));
92 ret = NT_STATUS_NO_MEMORY;
93 goto error;
94 }
95
96 /* increase the HWM */
97 ret = dbwrap_change_uint32_atomic_bystring(db, HWM, &domainnum, 1);
98 if (!NT_STATUS_IS_OK(ret)) {
99 DEBUG(1, ("Fatal error while fetching a new "
100 "domain range value!\n"));
101 goto error;
102 }
103
104 /* store away the new mapping in both directions */
105 ret = dbwrap_store_uint32_bystring(db, cfg->sid, domainnum);
106 if (!NT_STATUS_IS_OK(ret)) {
107 DEBUG(1, ("Fatal error while storing new "
108 "domain->range assignment!\n"));
109 goto error;
110 }
111
112 numstr = talloc_asprintf(db, "%u", domainnum);
113 if (!numstr) {
114 ret = NT_STATUS_NO_MEMORY;
115 goto error;
116 }
117
118 ret = dbwrap_store_bystring(db, numstr,
119 string_term_tdb_data(cfg->sid), TDB_INSERT);
120
121 talloc_free(numstr);
122 if (!NT_STATUS_IS_OK(ret)) {
123 DEBUG(1, ("Fatal error while storing "
124 "new domain->range assignment!\n"));
125 goto error;
126 }
127 DEBUG(5, ("Acquired new range #%d for domain %s\n",
128 domainnum, cfg->sid));
129
130 cfg->domainnum = domainnum;
131
132 return NT_STATUS_OK;
133
134 error:
135 return ret;
136
137 }
138
139 static NTSTATUS idmap_autorid_get_domainrange(struct autorid_domain_config *dom,
140 bool read_only)
141 {
142 NTSTATUS ret;
143
144 /*
145 * try to find mapping without locking the database,
146 * if it is not found create a mapping in a transaction unless
147 * read-only mode has been set
148 */
149 ret = dbwrap_fetch_uint32_bystring(autorid_db, dom->sid,
150 &(dom->domainnum));
151
152 if (!NT_STATUS_IS_OK(ret)) {
153 if (read_only) {
154 return NT_STATUS_NOT_FOUND;
155 }
156 ret = dbwrap_trans_do(autorid_db,
157 idmap_autorid_get_domainrange_action, dom);
158 }
159
160 DEBUG(10, ("Using range #%d for domain %s\n", dom->domainnum,
161 dom->sid));
162
163 return ret;
164 }
165
166 static NTSTATUS idmap_autorid_allocate_id(struct idmap_domain *dom,
167 struct unixid *xid) {
168
169 NTSTATUS ret;
170 struct idmap_tdb_common_context *commoncfg;
171 struct autorid_global_config *globalcfg;
172 struct autorid_domain_config domaincfg;
173
174 commoncfg =
175 talloc_get_type_abort(dom->private_data,
176 struct idmap_tdb_common_context);
177
178 globalcfg = talloc_get_type(commoncfg->private_data,
179 struct autorid_global_config);
180
181 if (dom->read_only) {
182 DEBUG(3, ("Backend is read-only, refusing "
183 "new allocation request\n"));
184 return NT_STATUS_UNSUCCESSFUL;
185 }
186
187 /* fetch the range for the allocation pool */
188
189 ZERO_STRUCT(domaincfg);
190
191 domaincfg.globalcfg = globalcfg;
192 fstrcpy(domaincfg.sid, ALLOC_RANGE);
193
194 ret = idmap_autorid_get_domainrange(&domaincfg, dom->read_only);
195
196 if (!NT_STATUS_IS_OK(ret)) {
197 DEBUG(3, ("Could not determine range for allocation pool, "
198 "check previous messages for reason\n"));
199 return ret;
200 }
201
202 ret = idmap_tdb_common_get_new_id(dom, xid);
203
204 if (!NT_STATUS_IS_OK(ret)) {
205 DEBUG(1, ("Fatal error while allocating new ID!\n"));
206 return ret;
207 }
208
209 xid->id = globalcfg->minvalue +
210 globalcfg->rangesize * domaincfg.domainnum +
211 xid->id;
212
213 DEBUG(10, ("Returned new %s %d from allocation range\n",
214 (xid->type==ID_TYPE_UID)?"uid":"gid", xid->id));
215
216 return ret;
217 }
218
219 /*
220 * map a SID to xid using the idmap_tdb like pool
221 */
222 static NTSTATUS idmap_autorid_map_id_to_sid(struct idmap_domain *dom,
223 struct id_map *map)
224 {
225 NTSTATUS ret;
226
227 /* look out for the mapping */
228 ret = idmap_tdb_common_unixid_to_sid(dom, map);
229
230 if (NT_STATUS_IS_OK(ret)) {
231 map->status = ID_MAPPED;
232 return ret;
233 }
234
235 map->status = ID_UNKNOWN;
236
237 DEBUG(10, ("no ID->SID mapping for %d could be found\n", map->xid.id));
238
239 return ret;
240 }
241
242 static NTSTATUS idmap_autorid_id_to_sid(struct autorid_global_config *cfg,
243 struct idmap_domain *dom,
244 struct id_map *map)
245 {
246 uint32_t range;
247 TDB_DATA data = tdb_null;
248 char *keystr;
249 struct dom_sid sid;
250 NTSTATUS status;
251
252 /* can this be one of our ids? */
253 if (map->xid.id < cfg->minvalue) {
254 DEBUG(10, ("id %d is lower than minimum value, "
255 "ignoring mapping request\n", map->xid.id));
256 map->status = ID_UNKNOWN;
257 return NT_STATUS_OK;
258 }
259
260 if (map->xid.id > (cfg->minvalue + cfg->rangesize * cfg->maxranges)) {
261 DEBUG(10, ("id %d is outside of maximum id value, "
262 "ignoring mapping request\n", map->xid.id));
263 map->status = ID_UNKNOWN;
264 return NT_STATUS_OK;
265 }
266
267 /* determine the range of this uid */
268 range = ((map->xid.id - cfg->minvalue) / cfg->rangesize);
269
270 keystr = talloc_asprintf(talloc_tos(), "%u", range);
271 if (!keystr) {
272 return NT_STATUS_NO_MEMORY;
273 }
274
275 status = dbwrap_fetch_bystring(autorid_db, talloc_tos(), keystr, &data);
276 TALLOC_FREE(keystr);
277
278 if (!NT_STATUS_IS_OK(status)) {
279 DEBUG(4, ("id %d belongs to range %d which does not have "
280 "domain mapping, ignoring mapping request\n",
281 map->xid.id, range));
282 TALLOC_FREE(data.dptr);
283 map->status = ID_UNKNOWN;
284 return NT_STATUS_OK;
285 }
286
287 if (strncmp((const char *)data.dptr,
288 ALLOC_RANGE,
289 strlen(ALLOC_RANGE)) == 0) {
290 /*
291 * this is from the alloc range, check if there is a mapping
292 */
293 DEBUG(5, ("id %d belongs to allocation range, "
294 "checking for mapping\n",
295 map->xid.id));
296 TALLOC_FREE(data.dptr);
297 return idmap_autorid_map_id_to_sid(dom, map);
298 }
299
300 string_to_sid(&sid, (const char *)data.dptr);
301 TALLOC_FREE(data.dptr);
302
303 sid_compose(map->sid, &sid,
304 (map->xid.id - cfg->minvalue -
305 range * cfg->rangesize));
306
307 /* We **really** should have some way of validating
308 the SID exists and is the correct type here. But
309 that is a deficiency in the idmap_rid design. */
310
311 map->status = ID_MAPPED;
312 map->xid.type = ID_TYPE_BOTH;
313
314 return NT_STATUS_OK;
315 }
316
317 /**********************************
318 Single sid to id lookup function.
319 **********************************/
320
321 static NTSTATUS idmap_autorid_sid_to_id(struct autorid_global_config *global,
322 struct autorid_domain_config *domain,
323 struct id_map *map)
324 {
325 uint32_t rid;
326
327 sid_peek_rid(map->sid, &rid);
328
329 /* if the rid is higher than the size of the range, we cannot map it */
330 if (rid >= global->rangesize) {
331 map->status = ID_UNKNOWN;
332 DEBUG(2, ("RID %d is larger then size of range (%d), "
333 "user cannot be mapped\n", rid, global->rangesize));
334 return NT_STATUS_UNSUCCESSFUL;
335 }
336 map->xid.id = global->minvalue +
337 (global->rangesize * domain->domainnum)+rid;
338 map->xid.type = ID_TYPE_BOTH;
339
340 /* We **really** should have some way of validating
341 the SID exists and is the correct type here. But
342 that is a deficiency in the idmap_rid design. */
343
344 map->status = ID_MAPPED;
345
346 return NT_STATUS_OK;
347 }
348
349 /**********************************
350 lookup a set of unix ids.
351 **********************************/
352
353 static NTSTATUS idmap_autorid_unixids_to_sids(struct idmap_domain *dom,
354 struct id_map **ids)
355 {
356 struct idmap_tdb_common_context *commoncfg;
357 struct autorid_global_config *globalcfg;
358 NTSTATUS ret;
359 int i;
360 int num_tomap = 0;
361 int num_mapped = 0;
362
363 /* initialize the status to avoid surprise */
364 for (i = 0; ids[i]; i++) {
365 ids[i]->status = ID_UNKNOWN;
366 num_tomap++;
367 }
368
369 commoncfg =
370 talloc_get_type_abort(dom->private_data,
371 struct idmap_tdb_common_context);
372
373 globalcfg = talloc_get_type(commoncfg->private_data,
374 struct autorid_global_config);
375
376 for (i = 0; ids[i]; i++) {
377
378 ret = idmap_autorid_id_to_sid(globalcfg, dom, ids[i]);
379
380 if ((!NT_STATUS_IS_OK(ret)) &&
381 (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
382 /* some fatal error occurred, log it */
383 DEBUG(3, ("Unexpected error resolving an ID "
384 " (%d)\n", ids[i]->xid.id));
385 goto failure;
386 }
387
388 if (NT_STATUS_IS_OK(ret) && ids[i]->status == ID_MAPPED) {
389 num_mapped++;
390 }
391
392 }
393
394 if (num_tomap == num_mapped) {
395 return NT_STATUS_OK;
396 } else if (num_mapped == 0) {
397 return NT_STATUS_NONE_MAPPED;
398 }
399
400 return STATUS_SOME_UNMAPPED;
401
402
403 failure:
404 return ret;
405 }
406
407 /*
408 * map a SID to xid using the idmap_tdb like pool
409 */
410 static NTSTATUS idmap_autorid_map_sid_to_id(struct idmap_domain *dom,
411 struct id_map *map,
412 struct idmap_tdb_common_context *ctx)
413 {
414 NTSTATUS ret;
415 int res;
416
417 /* see if we already have a mapping */
418 ret = idmap_tdb_common_sid_to_unixid(dom, map);
419
420 if (NT_STATUS_IS_OK(ret)) {
421 map->status = ID_MAPPED;
422 return ret;
423 }
424
425 /* bad things happened */
426 if (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
427 DEBUG(1, ("Looking up SID->ID mapping for %s failed\n",
428 sid_string_dbg(map->sid)));
429 return ret;
430 }
431
432 if (dom->read_only) {
433 DEBUG(3, ("Not allocating new mapping for %s, because backend "
434 "is read-only\n", sid_string_dbg(map->sid)));
435 return NT_STATUS_NONE_MAPPED;
436 }
437
438 DEBUG(10, ("Creating new mapping in pool for %s\n",
439 sid_string_dbg(map->sid)));
440
441 /* create new mapping */
442 res = dbwrap_transaction_start(ctx->db);
443 if (res != 0) {
444 DEBUG(2, ("transaction_start failed\n"));
445 return NT_STATUS_INTERNAL_DB_CORRUPTION;
446 }
447
448 ret = idmap_tdb_common_new_mapping(dom, map);
449
450 map->status = (NT_STATUS_IS_OK(ret))?ID_MAPPED:ID_UNMAPPED;
451
452 if (!NT_STATUS_IS_OK(ret)) {
453 if (dbwrap_transaction_cancel(ctx->db) != 0) {
454 smb_panic("Cancelling transaction failed");
455 }
456 return ret;
457 }
458
459 res = dbwrap_transaction_commit(ctx->db);
460 if (res == 0) {
461 return ret;
462 }
463
464 DEBUG(2, ("transaction_commit failed\n"));
465 return NT_STATUS_INTERNAL_DB_CORRUPTION;
466
467 }
468
469 /**********************************
470 lookup a set of sids.
471 **********************************/
472
473 static NTSTATUS idmap_autorid_sids_to_unixids(struct idmap_domain *dom,
474 struct id_map **ids)
475 {
476 struct idmap_tdb_common_context *commoncfg;
477 struct autorid_global_config *global;
478 NTSTATUS ret;
479 int i;
480 int num_tomap = 0;
481 int num_mapped = 0;
482
483 /* initialize the status to avoid surprise */
484 for (i = 0; ids[i]; i++) {
485 ids[i]->status = ID_UNKNOWN;
486 num_tomap++;
487 }
488
489 commoncfg =
490 talloc_get_type_abort(dom->private_data,
491 struct idmap_tdb_common_context);
492
493 global = talloc_get_type(commoncfg->private_data,
494 struct autorid_global_config);
495
496 for (i = 0; ids[i]; i++) {
497 struct winbindd_tdc_domain *domain;
498 struct autorid_domain_config domaincfg;
499 uint32_t rid;
500 struct dom_sid domainsid;
501
502 ZERO_STRUCT(domaincfg);
503
504 DEBUG(10, ("Trying to map %s\n", sid_string_dbg(ids[i]->sid)));
505
506 sid_copy(&domainsid, ids[i]->sid);
507 if (!sid_split_rid(&domainsid, &rid)) {
508 DEBUG(4, ("Could not determine domain SID from %s, "
509 "ignoring mapping request\n",
510 sid_string_dbg(ids[i]->sid)));
511 continue;
512 }
513
514 /* is this a well-known SID? */
515
516 if (sid_check_is_wellknown_domain(&domainsid, NULL)) {
517
518 DEBUG(10, ("SID %s is well-known, using pool\n",
519 sid_string_dbg(ids[i]->sid)));
520
521 ret = idmap_autorid_map_sid_to_id(dom, ids[i],
522 commoncfg);
523
524 if (!NT_STATUS_IS_OK(ret) &&
525 !NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
526 DEBUG(3, ("Unexpected error resolving "
527 "SID (%s)\n",
528 sid_string_dbg(ids[i]->sid)));
529 goto failure;
530 }
531
532 if (ids[i]->status == ID_MAPPED) {
533 num_mapped++;
534 }
535
536 continue;
537 }
538
539 /* BUILTIN is passdb's job */
540 if (dom_sid_equal(&domainsid, &global_sid_Builtin) &&
541 global->ignore_builtin) {
542 DEBUG(10, ("Ignoring request for BUILTIN domain\n"));
543 continue;
544 }
545
546 /*
547 * Check if the domain is around
548 */
549 domain = wcache_tdc_fetch_domainbysid(talloc_tos(),
550 &domainsid);
551 if (domain == NULL) {
552 DEBUG(10, ("Ignoring unknown domain sid %s\n",
553 sid_string_dbg(&domainsid)));
554 continue;
555 }
556 TALLOC_FREE(domain);
557
558 domaincfg.globalcfg = global;
559 sid_to_fstring(domaincfg.sid, &domainsid);
560
561 ret = idmap_autorid_get_domainrange(&domaincfg, dom->read_only);
562
563 /* read-only mode and a new domain range would be required? */
564 if (NT_STATUS_EQUAL(ret, NT_STATUS_NOT_FOUND) &&
565 dom->read_only) {
566 DEBUG(10, ("read-only is enabled, did not allocate "
567 "new range for domain %s\n",
568 sid_string_dbg(&domainsid)));
569 continue;
570 }
571
572 if (!NT_STATUS_IS_OK(ret)) {
573 DEBUG(3, ("Could not determine range for domain, "
574 "check previous messages for reason\n"));
575 goto failure;
576 }
577
578 ret = idmap_autorid_sid_to_id(global, &domaincfg, ids[i]);
579
580 if ((!NT_STATUS_IS_OK(ret)) &&
581 (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
582 /* some fatal error occurred, log it */
583 DEBUG(3, ("Unexpected error resolving a SID (%s)\n",
584 sid_string_dbg(ids[i]->sid)));
585 goto failure;
586 }
587
588 if (NT_STATUS_IS_OK(ret)) {
589 num_mapped++;
590 }
591 }
592
593 if (num_tomap == num_mapped) {
594 return NT_STATUS_OK;
595 } else if (num_mapped == 0) {
596 return NT_STATUS_NONE_MAPPED;
597 }
598
599 return STATUS_SOME_UNMAPPED;
600
601 failure:
602 return ret;
603
604 }
605
606 /* initialize the given HWM to 0 if it does not exist yet */
607 static NTSTATUS idmap_autorid_init_hwm(const char *hwm) {
608
609 NTSTATUS status;
610 uint32_t hwmval;
611
612 status = dbwrap_fetch_uint32_bystring(autorid_db, hwm, &hwmval);
613 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
614 status = dbwrap_trans_store_int32_bystring(autorid_db, hwm, 0);
615 if (!NT_STATUS_IS_OK(status)) {
616 DEBUG(0,
617 ("Unable to initialise HWM (%s) in autorid "
618 "database: %s\n", hwm, nt_errstr(status)));
619 return NT_STATUS_INTERNAL_DB_ERROR;
620 }
621 } else if (!NT_STATUS_IS_OK(status)) {
622 DEBUG(0, ("unable to fetch HWM (%s) from autorid "
623 "database: %s\n", hwm, nt_errstr(status)));
624 return status;
625 }
626
627 return NT_STATUS_OK;
628 }
629
630 /*
631 * open and initialize the database which stores the ranges for the domains
632 */
633 static NTSTATUS idmap_autorid_db_init(void)
634 {
635 NTSTATUS status;
636
637 if (autorid_db) {
638 /* its already open */
639 return NT_STATUS_OK;
640 }
641
642 /* Open idmap repository */
643 autorid_db = db_open(NULL, state_path("autorid.tdb"), 0,
644 TDB_DEFAULT, O_RDWR | O_CREAT, 0644,
645 DBWRAP_LOCK_ORDER_1);
646
647 if (!autorid_db) {
648 DEBUG(0, ("Unable to open idmap_autorid database '%s'\n",
649 state_path("autorid.tdb")));
650 return NT_STATUS_UNSUCCESSFUL;
651 }
652
653 /* Initialize high water mark for the currently used range to 0 */
654
655 status = idmap_autorid_init_hwm(HWM);
656 NT_STATUS_NOT_OK_RETURN(status);
657
658 status = idmap_autorid_init_hwm(ALLOC_HWM_UID);
659 NT_STATUS_NOT_OK_RETURN(status);
660
661 status = idmap_autorid_init_hwm(ALLOC_HWM_GID);
662
663 return status;
664 }
665
666 static struct autorid_global_config *idmap_autorid_loadconfig(TALLOC_CTX * ctx)
667 {
668
669 TDB_DATA data;
670 struct autorid_global_config *cfg;
671 unsigned long minvalue, rangesize, maxranges;
672 NTSTATUS status;
673
674 status = dbwrap_fetch_bystring(autorid_db, ctx, CONFIGKEY, &data);
675
676 if (!NT_STATUS_IS_OK(status)) {
677 DEBUG(10, ("No saved config found\n"));
678 return NULL;
679 }
680
681 cfg = talloc_zero(ctx, struct autorid_global_config);
682 if (!cfg) {
683 return NULL;
684 }
685
686 if (sscanf((char *)data.dptr,
687 "minvalue:%lu rangesize:%lu maxranges:%lu",
688 &minvalue, &rangesize, &maxranges) != 3) {
689 DEBUG(1,
690 ("Found invalid configuration data"
691 "creating new config\n"));
692 return NULL;
693 }
694
695 cfg->minvalue = minvalue;
696 cfg->rangesize = rangesize;
697 cfg->maxranges = maxranges;
698
699 DEBUG(10, ("Loaded previously stored configuration "
700 "minvalue:%d rangesize:%d\n",
701 cfg->minvalue, cfg->rangesize));
702
703 return cfg;
704
705 }
706
707 static NTSTATUS idmap_autorid_saveconfig(struct autorid_global_config *cfg)
708 {
709
710 NTSTATUS status;
711 TDB_DATA data;
712 char *cfgstr;
713
714 cfgstr =
715 talloc_asprintf(talloc_tos(),
716 "minvalue:%u rangesize:%u maxranges:%u",
717 cfg->minvalue, cfg->rangesize, cfg->maxranges);
718
719 if (!cfgstr) {
720 return NT_STATUS_NO_MEMORY;
721 }
722
723 data = string_tdb_data(cfgstr);
724
725 status = dbwrap_trans_store_bystring(autorid_db, CONFIGKEY,
726 data, TDB_REPLACE);
727
728 talloc_free(cfgstr);
729
730 return status;
731 }
732
733 static NTSTATUS idmap_autorid_preallocate_wellknown(struct idmap_domain *dom)
734 {
735 const char *groups[] = { "S-1-1-0", "S-1-2-0", "S-1-2-1",
736 "S-1-3-0", "S-1-3-1", "S-1-3-2", "S-1-3-3", "S-1-3-4",
737 "S-1-5-1", "S-1-5-2", "S-1-5-3", "S-1-5-4", "S-1-5-6",
738 "S-1-5-7", "S-1-5-8", "S-1-5-9", "S-1-5-10", "S-1-5-11",
739 "S-1-5-12", "S-1-5-13", "S-1-5-14", "S-1-5-15",
740 "S-1-5-17", "S-1-5-18", "S-1-5-19", "S-1-5-20"
741 };
742
743 struct id_map **maps;
744 int i, num;
745 NTSTATUS status;
746
747 if (dom->read_only) {
748 return NT_STATUS_OK;
749 }
750
751 num = sizeof(groups)/sizeof(char*);
752
753 maps = talloc_zero_array(talloc_tos(), struct id_map*, num+1);
754 if (!maps) {
755 return NT_STATUS_NO_MEMORY;
756 }
757
758 for (i = 0; i < num; i++) {
759 maps[i] = talloc(maps, struct id_map);
760 maps[i]->xid.type = ID_TYPE_GID;
761 maps[i]->sid = dom_sid_parse_talloc(maps, groups[i]);
762 }
763
764 maps[num] = NULL;
765
766 status = idmap_autorid_sids_to_unixids(dom, maps);
767
768 DEBUG(10,("Preallocation run finished with status %s\n",
769 nt_errstr(status)));
770
771 talloc_free(maps);
772
773 return NT_STATUS_IS_OK(status)?NT_STATUS_OK:NT_STATUS_UNSUCCESSFUL;
774 }
775
776 static NTSTATUS idmap_autorid_initialize(struct idmap_domain *dom)
777 {
778 struct idmap_tdb_common_context *commonconfig;
779 struct autorid_global_config *config;
780 struct autorid_global_config *storedconfig = NULL;
781 NTSTATUS status;
782 uint32_t hwm;
783
784 if (!strequal(dom->name, "*")) {
785 DEBUG(0, ("idmap_autorid_initialize: Error: autorid configured "
786 "for domain '%s'. But autorid can only be used for "
787 "the default idmap configuration.\n", dom->name));
788 return NT_STATUS_INVALID_PARAMETER;
789 }
790
791 commonconfig = talloc_zero(dom, struct idmap_tdb_common_context);
792 if (!commonconfig) {
793 DEBUG(0, ("Out of memory!\n"));
794 return NT_STATUS_NO_MEMORY;
795 }
796
797 commonconfig->rw_ops = talloc_zero(commonconfig, struct idmap_rw_ops);
798 if (commonconfig->rw_ops == NULL) {
799 DEBUG(0, ("Out of memory!\n"));
800 return NT_STATUS_NO_MEMORY;
801 }
802
803 config = talloc_zero(commonconfig, struct autorid_global_config);
804 if (!config) {
805 DEBUG(0, ("Out of memory!\n"));
806 return NT_STATUS_NO_MEMORY;
807 }
808
809 status = idmap_autorid_db_init();
810 if (!NT_STATUS_IS_OK(status)) {
811 goto error;
812 }
813
814 config->minvalue = dom->low_id;
815 config->rangesize = lp_parm_int(-1, "idmap config *",
816 "rangesize", 100000);
817
818 if (config->rangesize < 2000) {
819 DEBUG(1, ("autorid rangesize must be at least 2000\n"));
820 status = NT_STATUS_INVALID_PARAMETER;
821 goto error;
822 }
823
824 config->maxranges = (dom->high_id - dom->low_id + 1) /
825 config->rangesize;
826
827 if (config->maxranges == 0) {
828 DEBUG(1, ("allowed uid range is smaller then rangesize, "
829 "increase uid range or decrease rangesize\n"));
830 status = NT_STATUS_INVALID_PARAMETER;
831 goto error;
832 }
833
834 /* check if the high-low limit is a multiple of the rangesize */
835 if ((dom->high_id - dom->low_id + 1) % config->rangesize != 0) {
836 DEBUG(5, ("High uid-low uid difference of %d "
837 "is not a multiple of the rangesize %d, "
838 "limiting ranges to lower boundary number of %d\n",
839 (dom->high_id - dom->low_id + 1), config->rangesize,
840 config->maxranges));
841 }
842
843 DEBUG(10, ("Current configuration in config is "
844 "minvalue:%d rangesize:%d maxranges:%d\n",
845 config->minvalue, config->rangesize, config->maxranges));
846
847 /* read previously stored config and current HWM */
848 storedconfig = idmap_autorid_loadconfig(talloc_tos());
849
850 status = dbwrap_fetch_uint32_bystring(autorid_db, HWM, &hwm);
851 if (!NT_STATUS_IS_OK(status)) {
852 DEBUG(1, ("Fatal error while fetching current "
853 "HWM value: %s\n", nt_errstr(status)));
854 status = NT_STATUS_INTERNAL_ERROR;
855 goto error;
856 }
857
858 /* did the minimum value or rangesize change? */
859 if (storedconfig &&
860 ((storedconfig->minvalue != config->minvalue) ||
861 (storedconfig->rangesize != config->rangesize))) {
862 DEBUG(1, ("New configuration values for rangesize or "
863 "minimum uid value conflict with previously "
864 "used values! Aborting initialization\n"));
865 status = NT_STATUS_INVALID_PARAMETER;
866 goto error;
867 }
868
869 /*
870 * has the highest uid value been reduced to setting that is not
871 * sufficient any more for already existing ranges?
872 */
873 if (hwm > config->maxranges) {
874 DEBUG(1, ("New upper uid limit is too low to cover "
875 "existing mappings! Aborting initialization\n"));
876 status = NT_STATUS_INVALID_PARAMETER;
877 goto error;
878 }
879
880 status = idmap_autorid_saveconfig(config);
881
882 if (!NT_STATUS_IS_OK(status)) {
883 DEBUG(1, ("Failed to store configuration data!\n"));
884 goto error;
885 }
886
887 DEBUG(5, ("%d domain ranges with a size of %d are available\n",
888 config->maxranges, config->rangesize));
889
890 config->ignore_builtin = lp_parm_bool(-1, "idmap config *",
891 "ignore builtin", false);
892
893 /* fill the TDB common configuration */
894 commonconfig->private_data = config;
895
896 commonconfig->db = autorid_db;
897 commonconfig->max_id = config->rangesize -1;
898 commonconfig->hwmkey_uid = ALLOC_HWM_UID;
899 commonconfig->hwmkey_gid = ALLOC_HWM_GID;
900 commonconfig->rw_ops->get_new_id = idmap_autorid_allocate_id;
901 commonconfig->rw_ops->set_mapping = idmap_tdb_common_set_mapping;
902
903 dom->private_data = commonconfig;
904
905 /* preallocate well-known SIDs in the pool */
906 status = idmap_autorid_preallocate_wellknown(dom);
907
908 goto done;
909
910 error:
911 talloc_free(config);
912
913 done:
914 talloc_free(storedconfig);
915
916 return status;
917 }
918
919 /*
920 Close the idmap tdb instance
921 */
922 static struct idmap_methods autorid_methods = {
923 .init = idmap_autorid_initialize,
924 .unixids_to_sids = idmap_autorid_unixids_to_sids,
925 .sids_to_unixids = idmap_autorid_sids_to_unixids,
926 .allocate_id = idmap_autorid_allocate_id
927 };
928
929 NTSTATUS samba_init_module(void)
930 {
931 return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
932 "autorid", &autorid_methods);
933 }
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