2 * idmap_autorid: static map between Active Directory/NT RIDs
3 * and RFC 2307 accounts
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
8 * Copyright (C) Christian Ambach, 2010-2011
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.
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.
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/>.
26 #include "system/filesys.h"
28 #include "dbwrap/dbwrap.h"
29 #include "dbwrap/dbwrap_open.h"
31 #include "../libcli/security/dom_sid.h"
35 #define DBGC_CLASS DBGC_IDMAP
37 #define HWM "NEXT RANGE"
38 #define ALLOC_HWM "NEXT ALLOC ID"
39 #define ALLOC_POOL_SIZE 500
40 #define CONFIGKEY "CONFIG"
42 struct autorid_global_config {
48 struct autorid_domain_config {
51 struct autorid_global_config *globalcfg;
54 /* handle to the tdb storing domain <-> range assignments */
55 static struct db_context *autorid_db;
57 static NTSTATUS idmap_autorid_get_domainrange(struct db_context *db,
61 uint32_t domainnum, hwm;
64 struct autorid_domain_config *cfg;
66 cfg = (struct autorid_domain_config *)private_data;
67 dom_sid_string_buf(&(cfg->sid), sidstr, sizeof(sidstr));
69 if (!dbwrap_fetch_uint32(db, sidstr, &domainnum)) {
70 DEBUG(10, ("Acquiring new range for domain %s\n", sidstr));
72 /* fetch the current HWM */
73 if (!dbwrap_fetch_uint32(db, HWM, &hwm)) {
74 DEBUG(1, ("Fatal error while fetching current "
76 ret = NT_STATUS_INTERNAL_ERROR;
80 /* do we have a range left? */
81 if (hwm >= cfg->globalcfg->maxranges) {
82 DEBUG(1, ("No more domain ranges available!\n"));
83 ret = NT_STATUS_NO_MEMORY;
87 /* increase the HWM */
88 ret = dbwrap_change_uint32_atomic(db, HWM, &domainnum, 1);
89 if (!NT_STATUS_IS_OK(ret)) {
90 DEBUG(1, ("Fatal error while fetching a new "
91 "domain range value!\n"));
95 /* store away the new mapping in both directions */
96 ret = dbwrap_trans_store_uint32(db, sidstr, domainnum);
97 if (!NT_STATUS_IS_OK(ret)) {
98 DEBUG(1, ("Fatal error while storing new "
99 "domain->range assignment!\n"));
103 numstr = talloc_asprintf(db, "%u", domainnum);
105 ret = NT_STATUS_NO_MEMORY;
109 ret = dbwrap_trans_store_bystring(db, numstr,
110 string_term_tdb_data(sidstr),
113 if (!NT_STATUS_IS_OK(ret)) {
114 DEBUG(1, ("Fatal error while storing "
115 "new domain->range assignment!\n"));
118 DEBUG(5, ("Acquired new range #%d for domain %s\n",
122 DEBUG(10, ("Using range #%d for domain %s\n", domainnum, sidstr));
123 cfg->domainnum = domainnum;
132 static NTSTATUS idmap_autorid_id_to_sid(struct autorid_global_config *cfg,
140 /* can this be one of our ids? */
141 if (map->xid.id < cfg->minvalue) {
142 DEBUG(10, ("id %d is lower than minimum value, "
143 "ignoring mapping request\n", map->xid.id));
144 map->status = ID_UNKNOWN;
148 if (map->xid.id > (cfg->minvalue + cfg->rangesize * cfg->maxranges)) {
149 DEBUG(10, ("id %d is outside of maximum id value, "
150 "ignoring mapping request\n", map->xid.id));
151 map->status = ID_UNKNOWN;
155 /* determine the range of this uid */
156 range = ((map->xid.id - cfg->minvalue) / cfg->rangesize);
158 keystr = talloc_asprintf(talloc_tos(), "%u", range);
160 return NT_STATUS_NO_MEMORY;
163 data = dbwrap_fetch_bystring(autorid_db, talloc_tos(), keystr);
167 DEBUG(4, ("id %d belongs to range %d which does not have "
168 "domain mapping, ignoring mapping request\n",
169 map->xid.id, range));
170 map->status = ID_UNKNOWN;
174 string_to_sid(&sid, (const char *)data.dptr);
175 TALLOC_FREE(data.dptr);
177 sid_compose(map->sid, &sid,
178 (map->xid.id - cfg->minvalue -
179 range * cfg->rangesize));
181 /* We **really** should have some way of validating
182 the SID exists and is the correct type here. But
183 that is a deficiency in the idmap_rid design. */
185 map->status = ID_MAPPED;
189 /**********************************
190 Single sid to id lookup function.
191 **********************************/
193 static NTSTATUS idmap_autorid_sid_to_id(struct autorid_global_config *global,
194 struct autorid_domain_config *domain,
199 sid_peek_rid(map->sid, &rid);
201 /* if the rid is higher than the size of the range, we cannot map it */
202 if (rid >= global->rangesize) {
203 map->status = ID_UNKNOWN;
204 DEBUG(2, ("RID %d is larger then size of range (%d), "
205 "user cannot be mapped\n", rid, global->rangesize));
206 return NT_STATUS_UNSUCCESSFUL;
208 map->xid.id = global->minvalue +
209 (global->rangesize * domain->domainnum)+rid;
211 /* We **really** should have some way of validating
212 the SID exists and is the correct type here. But
213 that is a deficiency in the idmap_rid design. */
215 map->status = ID_MAPPED;
220 /**********************************
221 lookup a set of unix ids.
222 **********************************/
224 static NTSTATUS idmap_autorid_unixids_to_sids(struct idmap_domain *dom,
227 struct autorid_global_config *globalcfg;
231 /* initialize the status to avoid surprise */
232 for (i = 0; ids[i]; i++) {
233 ids[i]->status = ID_UNKNOWN;
236 globalcfg = talloc_get_type(dom->private_data,
237 struct autorid_global_config);
239 for (i = 0; ids[i]; i++) {
241 ret = idmap_autorid_id_to_sid(globalcfg, ids[i]);
243 if ((!NT_STATUS_IS_OK(ret)) &&
244 (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
245 /* some fatal error occurred, log it */
246 DEBUG(3, ("Unexpected error resolving an ID "
247 " (%d)\n", ids[i]->xid.id));
257 /**********************************
258 lookup a set of sids.
259 **********************************/
261 static NTSTATUS idmap_autorid_sids_to_unixids(struct idmap_domain *dom,
264 struct autorid_global_config *global;
268 /* initialize the status to avoid surprise */
269 for (i = 0; ids[i]; i++) {
270 ids[i]->status = ID_UNKNOWN;
273 global = talloc_get_type(dom->private_data,
274 struct autorid_global_config);
276 for (i = 0; ids[i]; i++) {
277 struct winbindd_tdc_domain *domain;
278 struct autorid_domain_config domaincfg;
281 ZERO_STRUCT(domaincfg);
283 sid_copy(&domaincfg.sid, ids[i]->sid);
284 if (!sid_split_rid(&domaincfg.sid, &rid)) {
285 DEBUG(4, ("Could not determine domain SID from %s, "
286 "ignoring mapping request\n",
287 sid_string_dbg(ids[i]->sid)));
292 * Check if the domain is around
294 domain = wcache_tdc_fetch_domainbysid(talloc_tos(),
296 if (domain == NULL) {
297 DEBUG(10, ("Ignoring unknown domain sid %s\n",
298 sid_string_dbg(&domaincfg.sid)));
303 domaincfg.globalcfg = global;
305 ret = dbwrap_trans_do(autorid_db,
306 idmap_autorid_get_domainrange,
309 if (!NT_STATUS_IS_OK(ret)) {
310 DEBUG(3, ("Could not determine range for domain, "
311 "check previous messages for reason\n"));
315 ret = idmap_autorid_sid_to_id(global, &domaincfg, ids[i]);
317 if ((!NT_STATUS_IS_OK(ret)) &&
318 (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
319 /* some fatal error occurred, log it */
320 DEBUG(3, ("Unexpected error resolving a SID (%s)\n",
321 sid_string_dbg(ids[i]->sid)));
333 * open and initialize the database which stores the ranges for the domains
335 static NTSTATUS idmap_autorid_db_init(void)
340 /* its already open */
344 /* Open idmap repository */
345 autorid_db = db_open(NULL, state_path("autorid.tdb"), 0,
346 TDB_DEFAULT, O_RDWR | O_CREAT, 0644);
349 DEBUG(0, ("Unable to open idmap_autorid database '%s'\n",
350 state_path("autorid.tdb")));
351 return NT_STATUS_UNSUCCESSFUL;
354 /* Initialize high water mark for the currently used range to 0 */
355 hwm = dbwrap_fetch_int32(autorid_db, HWM);
358 (dbwrap_trans_store_int32(autorid_db, HWM, 0))) {
360 ("Unable to initialise HWM in autorid "
362 return NT_STATUS_INTERNAL_DB_ERROR;
366 /* Initialize high water mark for alloc pool to 0 */
367 hwm = dbwrap_fetch_int32(autorid_db, ALLOC_HWM);
370 (dbwrap_trans_store_int32(autorid_db, ALLOC_HWM, 0))) {
372 ("Unable to initialise HWM in autorid "
374 return NT_STATUS_INTERNAL_DB_ERROR;
380 static struct autorid_global_config *idmap_autorid_loadconfig(TALLOC_CTX * ctx)
384 struct autorid_global_config *cfg;
385 unsigned long minvalue, rangesize, maxranges;
387 data = dbwrap_fetch_bystring(autorid_db, ctx, CONFIGKEY);
390 DEBUG(10, ("No saved config found\n"));
394 cfg = talloc_zero(ctx, struct autorid_global_config);
399 if (sscanf((char *)data.dptr,
400 "minvalue:%lu rangesize:%lu maxranges:%lu",
401 &minvalue, &rangesize, &maxranges) != 3) {
403 ("Found invalid configuration data"
404 "creating new config\n"));
408 cfg->minvalue = minvalue;
409 cfg->rangesize = rangesize;
410 cfg->maxranges = maxranges;
412 DEBUG(10, ("Loaded previously stored configuration "
413 "minvalue:%d rangesize:%d\n",
414 cfg->minvalue, cfg->rangesize));
420 static NTSTATUS idmap_autorid_saveconfig(struct autorid_global_config *cfg)
428 talloc_asprintf(talloc_tos(),
429 "minvalue:%u rangesize:%u maxranges:%u",
430 cfg->minvalue, cfg->rangesize, cfg->maxranges);
433 return NT_STATUS_NO_MEMORY;
436 data = string_tdb_data(cfgstr);
438 status = dbwrap_trans_store_bystring(autorid_db, CONFIGKEY,
446 static NTSTATUS idmap_autorid_initialize(struct idmap_domain *dom)
448 struct autorid_global_config *config;
449 struct autorid_global_config *storedconfig = NULL;
453 if (!strequal(dom->name, "*")) {
454 DEBUG(0, ("idmap_autorid_initialize: Error: autorid configured "
455 "for domain '%s'. But autorid can only be used for "
456 "the default idmap configuration.\n", dom->name));
457 return NT_STATUS_INVALID_PARAMETER;
460 config = talloc_zero(dom, struct autorid_global_config);
462 DEBUG(0, ("Out of memory!\n"));
463 return NT_STATUS_NO_MEMORY;
466 status = idmap_autorid_db_init();
467 if (!NT_STATUS_IS_OK(status)) {
471 config->minvalue = dom->low_id;
472 config->rangesize = lp_parm_int(-1, "idmap config *", "rangesize", 100000);
474 if (config->rangesize < 2000) {
475 DEBUG(1, ("autorid rangesize must be at least 2000\n"));
476 status = NT_STATUS_INVALID_PARAMETER;
480 config->maxranges = (dom->high_id - dom->low_id + 1) /
483 if (config->maxranges == 0) {
484 DEBUG(1, ("allowed uid range is smaller then rangesize, "
485 "increase uid range or decrease rangesize\n"));
486 status = NT_STATUS_INVALID_PARAMETER;
490 /* check if the high-low limit is a multiple of the rangesize */
491 if ((dom->high_id - dom->low_id + 1) % config->rangesize != 0) {
492 DEBUG(5, ("High uid-low uid difference of %d "
493 "is not a multiple of the rangesize %d, "
494 "limiting ranges to lower boundary number of %d\n",
495 (dom->high_id - dom->low_id + 1), config->rangesize,
499 DEBUG(10, ("Current configuration in config is "
500 "minvalue:%d rangesize:%d maxranges:%d\n",
501 config->minvalue, config->rangesize, config->maxranges));
503 /* read previously stored config and current HWM */
504 storedconfig = idmap_autorid_loadconfig(talloc_tos());
506 if (!dbwrap_fetch_uint32(autorid_db, HWM, &hwm)) {
507 DEBUG(1, ("Fatal error while fetching current "
509 status = NT_STATUS_INTERNAL_ERROR;
513 /* did the minimum value or rangesize change? */
515 ((storedconfig->minvalue != config->minvalue) ||
516 (storedconfig->rangesize != config->rangesize))) {
517 DEBUG(1, ("New configuration values for rangesize or "
518 "minimum uid value conflict with previously "
519 "used values! Aborting initialization\n"));
520 status = NT_STATUS_INVALID_PARAMETER;
525 * has the highest uid value been reduced to setting that is not
526 * sufficient any more for already existing ranges?
528 if (hwm > config->maxranges) {
529 DEBUG(1, ("New upper uid limit is too low to cover "
530 "existing mappings! Aborting initialization\n"));
531 status = NT_STATUS_INVALID_PARAMETER;
535 status = idmap_autorid_saveconfig(config);
537 if (!NT_STATUS_IS_OK(status)) {
538 DEBUG(1, ("Failed to store configuration data!\n"));
542 DEBUG(5, ("%d domain ranges with a size of %d are available\n",
543 config->maxranges, config->rangesize));
545 dom->private_data = config;
553 talloc_free(storedconfig);
558 static NTSTATUS idmap_autorid_allocate_id(struct idmap_domain *dom,
559 struct unixid *xid) {
561 struct autorid_global_config *globalcfg;
565 if (!strequal(dom->name, "*")) {
566 DEBUG(3, ("idmap_autorid_allocate_id: "
567 "Refusing creation of mapping for domain'%s'. "
568 "Currently only supported for the default "
571 return NT_STATUS_NOT_IMPLEMENTED;
574 globalcfg = talloc_get_type(dom->private_data,
575 struct autorid_global_config);
577 if (!dbwrap_fetch_uint32(autorid_db, ALLOC_HWM, &hwm)) {
578 DEBUG(1, ("Failed to fetch current allocation HWM value!\n"));
579 return NT_STATUS_INTERNAL_ERROR;
582 if (hwm > ALLOC_POOL_SIZE) {
583 DEBUG(1, ("allocation pool is depleted!\n"));
584 return NT_STATUS_NO_MEMORY;
587 ret = dbwrap_change_uint32_atomic(autorid_db, ALLOC_HWM, &(xid->id), 1);
588 if (!NT_STATUS_IS_OK(ret)) {
589 DEBUG(1, ("Fatal error while allocating new ID!\n"));
591 xid->id = (xid->id)+(globalcfg->minvalue);
597 Close the idmap tdb instance
599 static struct idmap_methods autorid_methods = {
600 .init = idmap_autorid_initialize,
601 .unixids_to_sids = idmap_autorid_unixids_to_sids,
602 .sids_to_unixids = idmap_autorid_sids_to_unixids,
603 .allocate_id = idmap_autorid_allocate_id
606 NTSTATUS idmap_autorid_init(void)
608 return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
609 "autorid", &autorid_methods);