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/>.
29 #include "../libcli/security/dom_sid.h"
32 #define DBGC_CLASS DBGC_IDMAP
34 #define HWM "NEXT RANGE"
35 #define CONFIGKEY "CONFIG"
37 struct autorid_global_config {
43 struct autorid_domain_config {
46 struct autorid_global_config *globalcfg;
49 /* handle to the tdb storing domain <-> range assignments */
50 static struct db_context *autorid_db;
52 static NTSTATUS idmap_autorid_get_domainrange(struct db_context *db,
56 uint32_t domainnum, hwm;
57 char *sidstr, *numstr;
58 struct autorid_domain_config *cfg;
60 cfg = (struct autorid_domain_config *)private_data;
61 sidstr = dom_sid_string(talloc_tos(), &(cfg->sid));
64 return NT_STATUS_NO_MEMORY;
67 if (!dbwrap_fetch_uint32(db, sidstr, &domainnum)) {
68 DEBUG(10, ("Acquiring new range for domain %s\n", sidstr));
70 /* fetch the current HWM */
71 if (!dbwrap_fetch_uint32(db, HWM, &hwm)) {
72 DEBUG(1, ("Fatal error while fetching current "
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, sidstr, 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(sidstr),
110 if (!NT_STATUS_IS_OK(ret)) {
112 DEBUG(1, ("Fatal error while storing "
113 "new domain->range assignment!\n"));
117 DEBUG(5, ("Acquired new range #%d for domain %s\n",
121 DEBUG(10, ("Using range #%d for domain %s\n", domainnum, sidstr));
122 cfg->domainnum = domainnum;
133 static NTSTATUS idmap_autorid_id_to_sid(struct autorid_global_config *cfg,
141 /* can this be one of our ids? */
142 if (map->xid.id < cfg->minvalue) {
143 DEBUG(10, ("id %d is lower than minimum value, "
144 "ignoring mapping request\n", map->xid.id));
145 map->status = ID_UNKNOWN;
149 if (map->xid.id > (cfg->minvalue + cfg->rangesize * cfg->maxranges)) {
150 DEBUG(10, ("id %d is outside of maximum id value, "
151 "ignoring mapping request\n", map->xid.id));
152 map->status = ID_UNKNOWN;
156 /* determine the range of this uid */
157 range = ((map->xid.id - cfg->minvalue) / cfg->rangesize);
159 keystr = talloc_asprintf(talloc_tos(), "%u", range);
161 return NT_STATUS_NO_MEMORY;
164 data = dbwrap_fetch_bystring(autorid_db, talloc_tos(), keystr);
168 DEBUG(4, ("id %d belongs to range %d which does not have "
169 "domain mapping, ignoring mapping request\n",
170 map->xid.id, range));
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;
232 /* initialize the status to avoid surprise */
233 for (i = 0; ids[i]; i++) {
234 ids[i]->status = ID_UNKNOWN;
237 globalcfg = talloc_get_type(dom->private_data,
238 struct autorid_global_config);
240 ctx = talloc_new(dom);
242 DEBUG(0, ("Out of memory!\n"));
243 return NT_STATUS_NO_MEMORY;
246 for (i = 0; ids[i]; i++) {
248 ret = idmap_autorid_id_to_sid(globalcfg, ids[i]);
250 if ((!NT_STATUS_IS_OK(ret)) &&
251 (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
252 /* some fatal error occurred, log it */
253 DEBUG(3, ("Unexpected error resolving an ID "
254 " (%d)\n", ids[i]->xid.id));
268 /**********************************
269 lookup a set of sids.
270 **********************************/
272 static NTSTATUS idmap_autorid_sids_to_unixids(struct idmap_domain *dom,
275 struct autorid_global_config *global;
279 /* initialize the status to avoid surprise */
280 for (i = 0; ids[i]; i++) {
281 ids[i]->status = ID_UNKNOWN;
284 global = talloc_get_type(dom->private_data,
285 struct autorid_global_config);
287 for (i = 0; ids[i]; i++) {
288 struct winbindd_tdc_domain *domain;
289 struct autorid_domain_config domaincfg;
292 ZERO_STRUCT(domaincfg);
294 sid_copy(&domaincfg.sid, ids[i]->sid);
295 if (!sid_split_rid(&domaincfg.sid, &rid)) {
296 DEBUG(4, ("Could not determine domain SID from %s, "
297 "ignoring mapping request\n",
298 sid_string_dbg(ids[i]->sid)));
303 * Check if the domain is around
305 domain = wcache_tdc_fetch_domainbysid(talloc_tos(),
307 if (domain == NULL) {
308 DEBUG(10, ("Ignoring unknown domain sid %s\n",
309 sid_string_dbg(&domaincfg.sid)));
314 domaincfg.globalcfg = global;
316 ret = dbwrap_trans_do(autorid_db,
317 idmap_autorid_get_domainrange,
320 if (!NT_STATUS_IS_OK(ret)) {
321 DEBUG(3, ("Could not determine range for domain, "
322 "check previous messages for reason\n"));
326 ret = idmap_autorid_sid_to_id(global, &domaincfg, ids[i]);
328 if ((!NT_STATUS_IS_OK(ret)) &&
329 (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
330 /* some fatal error occurred, log it */
331 DEBUG(3, ("Unexpected error resolving a SID (%s)\n",
332 sid_string_dbg(ids[i]->sid)));
344 * open and initialize the database which stores the ranges for the domains
346 static NTSTATUS idmap_autorid_db_init(void)
351 /* its already open */
355 /* Open idmap repository */
356 autorid_db = db_open(NULL, state_path("autorid.tdb"), 0,
357 TDB_DEFAULT, O_RDWR | O_CREAT, 0644);
360 DEBUG(0, ("Unable to open idmap_autorid database '%s'\n",
361 state_path("autorid.tdb")));
362 return NT_STATUS_UNSUCCESSFUL;
365 /* Initialize high water mark for the currently used range to 0 */
366 hwm = dbwrap_fetch_int32(autorid_db, HWM);
369 (dbwrap_trans_store_int32(autorid_db, HWM, 0))) {
371 ("Unable to initialise HWM in autorid "
373 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_P(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,
449 struct autorid_global_config *config;
450 struct autorid_global_config *storedconfig = NULL;
454 config = TALLOC_ZERO_P(dom, struct autorid_global_config);
456 DEBUG(0, ("Out of memory!\n"));
457 return NT_STATUS_NO_MEMORY;
460 status = idmap_autorid_db_init();
461 if (!NT_STATUS_IS_OK(status)) {
465 config->minvalue = dom->low_id;
466 config->rangesize = lp_parm_int(-1, "autorid", "rangesize", 100000);
468 if (config->rangesize < 2000) {
469 DEBUG(1, ("autorid rangesize must be at least 2000\n"));
470 status = NT_STATUS_INVALID_PARAMETER;
474 config->maxranges = (dom->high_id - dom->low_id + 1) /
477 if (config->maxranges == 0) {
478 DEBUG(1, ("allowed uid range is smaller then rangesize, "
479 "increase uid range or decrease rangesize\n"));
480 status = NT_STATUS_INVALID_PARAMETER;
484 /* check if the high-low limit is a multiple of the rangesize */
485 if ((dom->high_id - dom->low_id + 1) % config->rangesize != 0) {
486 DEBUG(5, ("High uid-low uid difference of %d "
487 "is not a multiple of the rangesize %d, "
488 "limiting ranges to lower boundary number of %d\n",
489 (dom->high_id - dom->low_id + 1), config->rangesize,
493 DEBUG(10, ("Current configuration in config is "
494 "minvalue:%d rangesize:%d maxranges:%d\n",
495 config->minvalue, config->rangesize, config->maxranges));
497 /* read previously stored config and current HWM */
498 storedconfig = idmap_autorid_loadconfig(talloc_tos());
500 if (!dbwrap_fetch_uint32(autorid_db, HWM, &hwm)) {
501 DEBUG(1, ("Fatal error while fetching current "
503 status = NT_STATUS_INTERNAL_ERROR;
507 /* did the minimum value or rangesize change? */
509 ((storedconfig->minvalue != config->minvalue) ||
510 (storedconfig->rangesize != config->rangesize))) {
511 DEBUG(1, ("New configuration values for rangesize or "
512 "minimum uid value conflict with previously "
513 "used values! Aborting initialization\n"));
514 status = NT_STATUS_INVALID_PARAMETER;
519 * has the highest uid value been reduced to setting that is not
520 * sufficient any more for already existing ranges?
522 if (hwm > config->maxranges) {
523 DEBUG(1, ("New upper uid limit is too low to cover "
524 "existing mappings! Aborting initialization\n"));
525 status = NT_STATUS_INVALID_PARAMETER;
529 status = idmap_autorid_saveconfig(config);
531 if (!NT_STATUS_IS_OK(status)) {
532 DEBUG(1, ("Failed to store configuration data!\n"));
536 DEBUG(5, ("%d domain ranges with a size of %d are available\n",
537 config->maxranges, config->rangesize));
539 dom->private_data = config;
541 if (!NT_STATUS_IS_OK(status)) {
549 talloc_free(storedconfig);
555 Close the idmap tdb instance
557 static struct idmap_methods autorid_methods = {
558 .init = idmap_autorid_initialize,
559 .unixids_to_sids = idmap_autorid_unixids_to_sids,
560 .sids_to_unixids = idmap_autorid_sids_to_unixids,
563 NTSTATUS idmap_autorid_init(void)
565 return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
566 "autorid", &autorid_methods);