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 CONFIGKEY "CONFIG"
40 struct autorid_global_config {
46 struct autorid_domain_config {
49 struct autorid_global_config *globalcfg;
52 /* handle to the tdb storing domain <-> range assignments */
53 static struct db_context *autorid_db;
55 static NTSTATUS idmap_autorid_get_domainrange(struct db_context *db,
59 uint32_t domainnum, hwm;
61 struct autorid_domain_config *cfg;
63 cfg = (struct autorid_domain_config *)private_data;
65 ret = dbwrap_fetch_uint32(db, cfg->sid, &domainnum);
66 if (!NT_STATUS_IS_OK(ret)) {
67 DEBUG(10, ("Acquiring new range for domain %s\n", cfg->sid));
69 /* fetch the current HWM */
70 ret = dbwrap_fetch_uint32(db, HWM, &hwm);
71 if (!NT_STATUS_IS_OK(ret)) {
72 DEBUG(1, ("Fatal error while fetching current "
73 "HWM value: %s\n", nt_errstr(ret)));
74 ret = NT_STATUS_INTERNAL_ERROR;
78 /* do we have a range left? */
79 if (hwm >= cfg->globalcfg->maxranges) {
80 DEBUG(1, ("No more domain ranges available!\n"));
81 ret = NT_STATUS_NO_MEMORY;
85 /* increase the HWM */
86 ret = dbwrap_change_uint32_atomic(db, HWM, &domainnum, 1);
87 if (!NT_STATUS_IS_OK(ret)) {
88 DEBUG(1, ("Fatal error while fetching a new "
89 "domain range value!\n"));
93 /* store away the new mapping in both directions */
94 ret = dbwrap_trans_store_uint32(db, cfg->sid, domainnum);
95 if (!NT_STATUS_IS_OK(ret)) {
96 DEBUG(1, ("Fatal error while storing new "
97 "domain->range assignment!\n"));
101 numstr = talloc_asprintf(db, "%u", domainnum);
103 ret = NT_STATUS_NO_MEMORY;
107 ret = dbwrap_trans_store_bystring(db, numstr,
108 string_term_tdb_data(cfg->sid), TDB_INSERT);
111 if (!NT_STATUS_IS_OK(ret)) {
112 DEBUG(1, ("Fatal error while storing "
113 "new domain->range assignment!\n"));
116 DEBUG(5, ("Acquired new range #%d for domain %s\n",
117 domainnum, cfg->sid));
120 DEBUG(10, ("Using range #%d for domain %s\n", domainnum, cfg->sid));
121 cfg->domainnum = domainnum;
130 static NTSTATUS idmap_autorid_id_to_sid(struct autorid_global_config *cfg,
139 /* can this be one of our ids? */
140 if (map->xid.id < cfg->minvalue) {
141 DEBUG(10, ("id %d is lower than minimum value, "
142 "ignoring mapping request\n", map->xid.id));
143 map->status = ID_UNKNOWN;
147 if (map->xid.id > (cfg->minvalue + cfg->rangesize * cfg->maxranges)) {
148 DEBUG(10, ("id %d is outside of maximum id value, "
149 "ignoring mapping request\n", map->xid.id));
150 map->status = ID_UNKNOWN;
154 /* determine the range of this uid */
155 range = ((map->xid.id - cfg->minvalue) / cfg->rangesize);
157 keystr = talloc_asprintf(talloc_tos(), "%u", range);
159 return NT_STATUS_NO_MEMORY;
162 status = dbwrap_fetch_bystring(autorid_db, talloc_tos(), keystr, &data);
165 if (!NT_STATUS_IS_OK(status)) {
166 DEBUG(4, ("id %d belongs to range %d which does not have "
167 "domain mapping, ignoring mapping request\n",
168 map->xid.id, range));
169 map->status = ID_UNKNOWN;
173 string_to_sid(&sid, (const char *)data.dptr);
174 TALLOC_FREE(data.dptr);
176 sid_compose(map->sid, &sid,
177 (map->xid.id - cfg->minvalue -
178 range * cfg->rangesize));
180 /* We **really** should have some way of validating
181 the SID exists and is the correct type here. But
182 that is a deficiency in the idmap_rid design. */
184 map->status = ID_MAPPED;
188 /**********************************
189 Single sid to id lookup function.
190 **********************************/
192 static NTSTATUS idmap_autorid_sid_to_id(struct autorid_global_config *global,
193 struct autorid_domain_config *domain,
198 sid_peek_rid(map->sid, &rid);
200 /* if the rid is higher than the size of the range, we cannot map it */
201 if (rid >= global->rangesize) {
202 map->status = ID_UNKNOWN;
203 DEBUG(2, ("RID %d is larger then size of range (%d), "
204 "user cannot be mapped\n", rid, global->rangesize));
205 return NT_STATUS_UNSUCCESSFUL;
207 map->xid.id = global->minvalue +
208 (global->rangesize * domain->domainnum)+rid;
210 /* We **really** should have some way of validating
211 the SID exists and is the correct type here. But
212 that is a deficiency in the idmap_rid design. */
214 map->status = ID_MAPPED;
219 /**********************************
220 lookup a set of unix ids.
221 **********************************/
223 static NTSTATUS idmap_autorid_unixids_to_sids(struct idmap_domain *dom,
226 struct autorid_global_config *globalcfg;
230 /* initialize the status to avoid surprise */
231 for (i = 0; ids[i]; i++) {
232 ids[i]->status = ID_UNKNOWN;
235 globalcfg = talloc_get_type(dom->private_data,
236 struct autorid_global_config);
238 for (i = 0; ids[i]; i++) {
240 ret = idmap_autorid_id_to_sid(globalcfg, ids[i]);
242 if ((!NT_STATUS_IS_OK(ret)) &&
243 (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
244 /* some fatal error occurred, log it */
245 DEBUG(3, ("Unexpected error resolving an ID "
246 " (%d)\n", ids[i]->xid.id));
256 /**********************************
257 lookup a set of sids.
258 **********************************/
260 static NTSTATUS idmap_autorid_sids_to_unixids(struct idmap_domain *dom,
263 struct autorid_global_config *global;
267 /* initialize the status to avoid surprise */
268 for (i = 0; ids[i]; i++) {
269 ids[i]->status = ID_UNKNOWN;
272 global = talloc_get_type(dom->private_data,
273 struct autorid_global_config);
275 for (i = 0; ids[i]; i++) {
276 struct winbindd_tdc_domain *domain;
277 struct autorid_domain_config domaincfg;
279 struct dom_sid domainsid;
281 ZERO_STRUCT(domaincfg);
283 sid_copy(&domainsid, ids[i]->sid);
284 if (!sid_split_rid(&domainsid, &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(&domainsid)));
303 domaincfg.globalcfg = global;
304 sid_to_fstring(domaincfg.sid, &domainsid);
306 ret = dbwrap_trans_do(autorid_db,
307 idmap_autorid_get_domainrange,
310 if (!NT_STATUS_IS_OK(ret)) {
311 DEBUG(3, ("Could not determine range for domain, "
312 "check previous messages for reason\n"));
316 ret = idmap_autorid_sid_to_id(global, &domaincfg, ids[i]);
318 if ((!NT_STATUS_IS_OK(ret)) &&
319 (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
320 /* some fatal error occurred, log it */
321 DEBUG(3, ("Unexpected error resolving a SID (%s)\n",
322 sid_string_dbg(ids[i]->sid)));
334 * open and initialize the database which stores the ranges for the domains
336 static NTSTATUS idmap_autorid_db_init(void)
342 /* its already open */
346 /* Open idmap repository */
347 autorid_db = db_open(NULL, state_path("autorid.tdb"), 0,
348 TDB_DEFAULT, O_RDWR | O_CREAT, 0644);
351 DEBUG(0, ("Unable to open idmap_autorid database '%s'\n",
352 state_path("autorid.tdb")));
353 return NT_STATUS_UNSUCCESSFUL;
356 /* Initialize high water mark for the currently used range to 0 */
357 status = dbwrap_fetch_int32(autorid_db, HWM, &hwm);
358 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND) ||
359 (NT_STATUS_IS_OK(status) && (hwm < 0)))
361 status = dbwrap_trans_store_int32(autorid_db, HWM, 0);
362 if (!NT_STATUS_IS_OK(status)) {
364 ("Unable to initialise HWM in autorid "
365 "database: %s\n", nt_errstr(status)));
366 return NT_STATUS_INTERNAL_DB_ERROR;
368 } else if (!NT_STATUS_IS_OK(status)) {
369 DEBUG(0, ("unable to fetch HWM from autorid database: %s\n",
377 static struct autorid_global_config *idmap_autorid_loadconfig(TALLOC_CTX * ctx)
381 struct autorid_global_config *cfg;
382 unsigned long minvalue, rangesize, maxranges;
385 status = dbwrap_fetch_bystring(autorid_db, ctx, CONFIGKEY, &data);
387 if (!NT_STATUS_IS_OK(status)) {
388 DEBUG(10, ("No saved config found\n"));
392 cfg = talloc_zero(ctx, struct autorid_global_config);
397 if (sscanf((char *)data.dptr,
398 "minvalue:%lu rangesize:%lu maxranges:%lu",
399 &minvalue, &rangesize, &maxranges) != 3) {
401 ("Found invalid configuration data"
402 "creating new config\n"));
406 cfg->minvalue = minvalue;
407 cfg->rangesize = rangesize;
408 cfg->maxranges = maxranges;
410 DEBUG(10, ("Loaded previously stored configuration "
411 "minvalue:%d rangesize:%d\n",
412 cfg->minvalue, cfg->rangesize));
418 static NTSTATUS idmap_autorid_saveconfig(struct autorid_global_config *cfg)
426 talloc_asprintf(talloc_tos(),
427 "minvalue:%u rangesize:%u maxranges:%u",
428 cfg->minvalue, cfg->rangesize, cfg->maxranges);
431 return NT_STATUS_NO_MEMORY;
434 data = string_tdb_data(cfgstr);
436 status = dbwrap_trans_store_bystring(autorid_db, CONFIGKEY,
444 static NTSTATUS idmap_autorid_initialize(struct idmap_domain *dom)
446 struct autorid_global_config *config;
447 struct autorid_global_config *storedconfig = NULL;
451 if (!strequal(dom->name, "*")) {
452 DEBUG(0, ("idmap_autorid_initialize: Error: autorid configured "
453 "for domain '%s'. But autorid can only be used for "
454 "the default idmap configuration.\n", dom->name));
455 return NT_STATUS_INVALID_PARAMETER;
458 config = talloc_zero(dom, struct autorid_global_config);
460 DEBUG(0, ("Out of memory!\n"));
461 return NT_STATUS_NO_MEMORY;
464 status = idmap_autorid_db_init();
465 if (!NT_STATUS_IS_OK(status)) {
469 config->minvalue = dom->low_id;
470 config->rangesize = lp_parm_int(-1, "idmap config *", "rangesize", 100000);
472 if (config->rangesize < 2000) {
473 DEBUG(1, ("autorid rangesize must be at least 2000\n"));
474 status = NT_STATUS_INVALID_PARAMETER;
478 config->maxranges = (dom->high_id - dom->low_id + 1) /
481 if (config->maxranges == 0) {
482 DEBUG(1, ("allowed uid range is smaller then rangesize, "
483 "increase uid range or decrease rangesize\n"));
484 status = NT_STATUS_INVALID_PARAMETER;
488 /* check if the high-low limit is a multiple of the rangesize */
489 if ((dom->high_id - dom->low_id + 1) % config->rangesize != 0) {
490 DEBUG(5, ("High uid-low uid difference of %d "
491 "is not a multiple of the rangesize %d, "
492 "limiting ranges to lower boundary number of %d\n",
493 (dom->high_id - dom->low_id + 1), config->rangesize,
497 DEBUG(10, ("Current configuration in config is "
498 "minvalue:%d rangesize:%d maxranges:%d\n",
499 config->minvalue, config->rangesize, config->maxranges));
501 /* read previously stored config and current HWM */
502 storedconfig = idmap_autorid_loadconfig(talloc_tos());
504 status = dbwrap_fetch_uint32(autorid_db, HWM, &hwm);
505 if (!NT_STATUS_IS_OK(status)) {
506 DEBUG(1, ("Fatal error while fetching current "
507 "HWM value: %s\n", nt_errstr(status)));
508 status = NT_STATUS_INTERNAL_ERROR;
512 /* did the minimum value or rangesize change? */
514 ((storedconfig->minvalue != config->minvalue) ||
515 (storedconfig->rangesize != config->rangesize))) {
516 DEBUG(1, ("New configuration values for rangesize or "
517 "minimum uid value conflict with previously "
518 "used values! Aborting initialization\n"));
519 status = NT_STATUS_INVALID_PARAMETER;
524 * has the highest uid value been reduced to setting that is not
525 * sufficient any more for already existing ranges?
527 if (hwm > config->maxranges) {
528 DEBUG(1, ("New upper uid limit is too low to cover "
529 "existing mappings! Aborting initialization\n"));
530 status = NT_STATUS_INVALID_PARAMETER;
534 status = idmap_autorid_saveconfig(config);
536 if (!NT_STATUS_IS_OK(status)) {
537 DEBUG(1, ("Failed to store configuration data!\n"));
541 DEBUG(5, ("%d domain ranges with a size of %d are available\n",
542 config->maxranges, config->rangesize));
544 dom->private_data = config;
552 talloc_free(storedconfig);
558 Close the idmap tdb instance
560 static struct idmap_methods autorid_methods = {
561 .init = idmap_autorid_initialize,
562 .unixids_to_sids = idmap_autorid_unixids_to_sids,
563 .sids_to_unixids = idmap_autorid_sids_to_unixids,
566 NTSTATUS samba_init_module(void)
568 return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
569 "autorid", &autorid_methods);