4 * Copyright (C) Gerald Carter <jerry@samba.org> 2007 - 2008
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
22 #include "winbindd/winbindd.h"
24 #include "idmap_hash.h"
29 #define DBGC_CLASS DBGC_IDMAP
31 struct sid_hash_table {
35 struct sid_hash_table *hashed_domains = NULL;
37 /*********************************************************************
38 Hash a domain SID (S-1-5-12-aaa-bbb-ccc) to a 12bit number
39 ********************************************************************/
41 static uint32_t hash_domain_sid(const struct dom_sid *sid)
45 if (sid->num_auths != 4)
48 /* XOR the last three subauths */
50 hash = ((sid->sub_auths[1] ^ sid->sub_auths[2]) ^ sid->sub_auths[3]);
52 /* Take all 32-bits into account when generating the 12-bit
54 hash = (((hash & 0xFFF00000) >> 20)
55 + ((hash & 0x000FFF00) >> 8)
56 + (hash & 0x000000FF)) & 0x0000FFF;
58 /* return a 12-bit hash value */
63 /*********************************************************************
64 Hash a Relative ID to a 20 bit number
65 ********************************************************************/
67 static uint32_t hash_rid(uint32_t rid)
69 /* 20 bits for the rid which allows us to support
70 the first 100K users/groups in a domain */
72 return (rid & 0x0007FFFF);
75 /*********************************************************************
76 ********************************************************************/
78 static uint32_t combine_hashes(uint32_t h_domain,
81 uint32_t return_id = 0;
83 /* shift the hash_domain 19 bits to the left and OR with the
86 return_id = ((h_domain<<19) | h_rid);
91 /*********************************************************************
92 ********************************************************************/
94 static void separate_hashes(uint32_t id,
98 *h_rid = id & 0x0007FFFF;
99 *h_domain = (id & 0x7FF80000) >> 19;
105 /*********************************************************************
106 ********************************************************************/
108 static NTSTATUS be_init(struct idmap_domain *dom,
111 NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
112 struct winbindd_tdc_domain *dom_list = NULL;
113 size_t num_domains = 0;
116 /* If the domain SID hash talbe has been initialized, assume
117 that we completed this function previously */
119 if ( hashed_domains ) {
120 nt_status = NT_STATUS_OK;
124 if (!wcache_tdc_fetch_list(&dom_list, &num_domains)) {
125 nt_status = NT_STATUS_TRUSTED_DOMAIN_FAILURE;
126 BAIL_ON_NTSTATUS_ERROR(nt_status);
129 /* Create the hash table of domain SIDs */
131 hashed_domains = TALLOC_ZERO_ARRAY(NULL, struct sid_hash_table, 4096);
132 BAIL_ON_PTR_NT_ERROR(hashed_domains, nt_status);
134 /* create the hash table of domain SIDs */
136 for (i=0; i<num_domains; i++) {
139 if (is_null_sid(&dom_list[i].sid))
141 if ((hash = hash_domain_sid(&dom_list[i].sid)) == 0)
144 DEBUG(5,("hash:be_init() Adding %s (%s) -> %d\n",
145 dom_list[i].domain_name,
146 sid_string_dbg(&dom_list[i].sid),
149 hashed_domains[hash].sid = talloc(hashed_domains, struct dom_sid);
150 sid_copy(hashed_domains[hash].sid, &dom_list[i].sid);
157 /*********************************************************************
158 ********************************************************************/
160 static NTSTATUS unixids_to_sids(struct idmap_domain *dom,
163 NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
166 /* initialize the status to avoid suprise */
167 for (i = 0; ids[i]; i++) {
168 ids[i]->status = ID_UNKNOWN;
171 nt_status = be_init(dom, NULL);
172 BAIL_ON_NTSTATUS_ERROR(nt_status);
175 nt_status = NT_STATUS_INVALID_PARAMETER;
176 BAIL_ON_NTSTATUS_ERROR(nt_status);
179 for (i=0; ids[i]; i++) {
180 uint32_t h_domain, h_rid;
182 ids[i]->status = ID_UNMAPPED;
184 separate_hashes(ids[i]->xid.id, &h_domain, &h_rid);
186 /* Make sure the caller allocated memor for us */
189 nt_status = NT_STATUS_INVALID_PARAMETER;
190 BAIL_ON_NTSTATUS_ERROR(nt_status);
193 /* If the domain hash doesn't find a SID in the table,
196 if (!hashed_domains[h_domain].sid)
199 sid_compose(ids[i]->sid, hashed_domains[h_domain].sid, h_rid);
200 ids[i]->status = ID_MAPPED;
207 /*********************************************************************
208 ********************************************************************/
210 static NTSTATUS sids_to_unixids(struct idmap_domain *dom,
213 NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
216 /* initialize the status to avoid suprise */
217 for (i = 0; ids[i]; i++) {
218 ids[i]->status = ID_UNKNOWN;
221 nt_status = be_init(dom, NULL);
222 BAIL_ON_NTSTATUS_ERROR(nt_status);
225 nt_status = NT_STATUS_INVALID_PARAMETER;
226 BAIL_ON_NTSTATUS_ERROR(nt_status);
229 for (i=0; ids[i]; i++) {
232 uint32_t h_domain, h_rid;
234 ids[i]->status = ID_UNMAPPED;
236 sid_copy(&sid, ids[i]->sid);
237 sid_split_rid(&sid, &rid);
239 h_domain = hash_domain_sid(&sid);
240 h_rid = hash_rid(rid);
242 /* Check that both hashes are non-zero*/
244 if (h_domain && h_rid) {
245 ids[i]->xid.id = combine_hashes(h_domain, h_rid);
246 ids[i]->status = ID_MAPPED;
254 /*********************************************************************
255 ********************************************************************/
257 static NTSTATUS be_close(struct idmap_domain *dom)
260 talloc_free(hashed_domains);
265 /*********************************************************************
266 ********************************************************************/
268 static NTSTATUS nss_hash_init(struct nss_domain_entry *e )
270 return be_init(NULL, NULL);
273 /**********************************************************************
274 *********************************************************************/
276 static NTSTATUS nss_hash_get_info(struct nss_domain_entry *e,
277 const struct dom_sid *sid,
281 const char **homedir,
286 NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
288 nt_status = nss_hash_init(e);
289 BAIL_ON_NTSTATUS_ERROR(nt_status);
291 if (!homedir || !shell || !gecos) {
292 nt_status = NT_STATUS_INVALID_PARAMETER;
293 BAIL_ON_NTSTATUS_ERROR(nt_status);
296 *homedir = talloc_strdup(ctx, lp_template_homedir());
297 BAIL_ON_PTR_NT_ERROR(*homedir, nt_status);
299 *shell = talloc_strdup(ctx, lp_template_shell());
300 BAIL_ON_PTR_NT_ERROR(*shell, nt_status);
304 /* Initialize the gid so that the upper layer fills
305 in the proper Windows primary group */
315 /**********************************************************************
316 *********************************************************************/
318 static NTSTATUS nss_hash_map_to_alias(TALLOC_CTX *mem_ctx,
319 struct nss_domain_entry *e,
323 NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
326 value = talloc_asprintf(mem_ctx, "%s\\%s", e->domain, name);
327 BAIL_ON_PTR_NT_ERROR(value, nt_status);
329 nt_status = mapfile_lookup_key(mem_ctx, value, alias);
330 BAIL_ON_NTSTATUS_ERROR(nt_status);
336 /**********************************************************************
337 *********************************************************************/
339 static NTSTATUS nss_hash_map_from_alias(TALLOC_CTX *mem_ctx,
340 struct nss_domain_entry *e,
344 return mapfile_lookup_value(mem_ctx, alias, name);
347 /**********************************************************************
348 *********************************************************************/
350 static NTSTATUS nss_hash_close(void)
355 /*********************************************************************
356 Dispatch Tables for IDMap and NssInfo Methods
357 ********************************************************************/
359 static struct idmap_methods hash_idmap_methods = {
361 .unixids_to_sids = unixids_to_sids,
362 .sids_to_unixids = sids_to_unixids,
366 static struct nss_info_methods hash_nss_methods = {
367 .init = nss_hash_init,
368 .get_nss_info = nss_hash_get_info,
369 .map_to_alias = nss_hash_map_to_alias,
370 .map_from_alias = nss_hash_map_from_alias,
371 .close_fn = nss_hash_close
374 /**********************************************************************
375 Register with the idmap and idmap_nss subsystems. We have to protect
376 against the idmap and nss_info interfaces being in a half-registered
378 **********************************************************************/
380 NTSTATUS idmap_hash_init(void)
382 static NTSTATUS idmap_status = NT_STATUS_UNSUCCESSFUL;
383 static NTSTATUS nss_status = NT_STATUS_UNSUCCESSFUL;
385 if ( !NT_STATUS_IS_OK(idmap_status) ) {
386 idmap_status = smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
387 "hash", &hash_idmap_methods);
389 if ( !NT_STATUS_IS_OK(idmap_status) ) {
390 DEBUG(0,("Failed to register hash idmap plugin.\n"));
395 if ( !NT_STATUS_IS_OK(nss_status) ) {
396 nss_status = smb_register_idmap_nss(SMB_NSS_INFO_INTERFACE_VERSION,
397 "hash", &hash_nss_methods);
398 if ( !NT_STATUS_IS_OK(nss_status) ) {
399 DEBUG(0,("Failed to register hash idmap nss plugin.\n"));