2 Unix SMB/CIFS implementation.
3 Password and authentication handling
4 Copyright (C) Jeremy Allison 1996-2002
5 Copyright (C) Andrew Tridgell 2002
6 Copyright (C) Gerald (Jerry) Carter 2000
7 Copyright (C) Stefan (metze) Metzmacher 2002
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
27 /* NOTE! the global_sam_sid is the SID of our local SAM. This is only
28 equal to the domain SID when we are a DC, otherwise its our
30 static struct dom_sid *global_sam_sid=NULL;
33 #define DBGC_CLASS DBGC_PASSDB
35 /****************************************************************************
36 Read a SID from a file. This is for compatibility with the old MACHINE.SID
38 ****************************************************************************/
40 static bool read_sid_from_file(const char *fname, struct dom_sid *sid)
46 lines = file_lines_load(fname, &numlines,0, NULL);
48 if (!lines || numlines < 1) {
53 ret = string_to_sid(sid, lines[0]);
59 generate a random sid - used to build our own sid if we don't have one
61 static void generate_random_sid(struct dom_sid *sid)
64 uchar raw_sid_data[12];
71 sid->sub_auths[sid->num_auths++] = 21;
73 generate_random_buffer(raw_sid_data, 12);
74 for (i = 0; i < 3; i++)
75 sid->sub_auths[sid->num_auths++] = IVAL(raw_sid_data, i*4);
78 /****************************************************************************
79 Generate the global machine sid.
80 ****************************************************************************/
82 static struct dom_sid *pdb_generate_sam_sid(void)
84 struct dom_sid domain_sid;
86 struct dom_sid *sam_sid;
88 if(!(sam_sid=SMB_MALLOC_P(struct dom_sid)))
92 if (secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
93 sid_copy(sam_sid, &domain_sid);
98 if (secrets_fetch_domain_sid(global_myname(), sam_sid)) {
100 /* We got our sid. If not a pdc/bdc, we're done. */
104 if (!secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
106 /* No domain sid and we're a pdc/bdc. Store it */
108 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
109 DEBUG(0,("pdb_generate_sam_sid: Can't store domain SID as a pdc/bdc.\n"));
116 if (!sid_equal(&domain_sid, sam_sid)) {
118 /* Domain name sid doesn't match global sam sid. Re-store domain sid as 'local' sid. */
120 DEBUG(0,("pdb_generate_sam_sid: Mismatched SIDs as a pdc/bdc.\n"));
121 if (!secrets_store_domain_sid(global_myname(), &domain_sid)) {
122 DEBUG(0,("pdb_generate_sam_sid: Can't re-store domain SID for local sid as PDC/BDC.\n"));
132 /* check for an old MACHINE.SID file for backwards compatibility */
133 if (asprintf(&fname, "%s/MACHINE.SID", lp_private_dir()) == -1) {
138 if (read_sid_from_file(fname, sam_sid)) {
139 /* remember it for future reference and unlink the old MACHINE.SID */
140 if (!secrets_store_domain_sid(global_myname(), sam_sid)) {
141 DEBUG(0,("pdb_generate_sam_sid: Failed to store SID from file.\n"));
148 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
149 DEBUG(0,("pdb_generate_sam_sid: Failed to store domain SID from file.\n"));
156 /* Stored the old sid from MACHINE.SID successfully.*/
163 /* we don't have the SID in secrets.tdb, we will need to
164 generate one and save it */
165 generate_random_sid(sam_sid);
167 if (!secrets_store_domain_sid(global_myname(), sam_sid)) {
168 DEBUG(0,("pdb_generate_sam_sid: Failed to store generated machine SID.\n"));
173 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
174 DEBUG(0,("pdb_generate_sam_sid: Failed to store generated domain SID.\n"));
183 /* return our global_sam_sid */
184 struct dom_sid *get_global_sam_sid(void)
186 struct db_context *db;
188 if (global_sam_sid != NULL)
189 return global_sam_sid;
192 * memory for global_sam_sid is allocated in
193 * pdb_generate_sam_sid() as needed
195 * Note: this is garded by a transaction
196 * to prevent races on startup which
197 * can happen with some dbwrap backends
200 db = secrets_db_ctx();
202 smb_panic("could not open secrets db");
205 if (db->transaction_start(db) != 0) {
206 smb_panic("could not start transaction on secrets db");
209 if (!(global_sam_sid = pdb_generate_sam_sid())) {
210 db->transaction_cancel(db);
211 smb_panic("could not generate a machine SID");
214 if (db->transaction_commit(db) != 0) {
215 smb_panic("could not start commit secrets db");
218 return global_sam_sid;
222 * Force get_global_sam_sid to requery the backends
224 void reset_global_sam_sid(void)
226 SAFE_FREE(global_sam_sid);
229 /*****************************************************************
230 Check if the SID is our domain SID (S-1-5-21-x-y-z).
231 *****************************************************************/
233 bool sid_check_is_domain(const struct dom_sid *sid)
235 return sid_equal(sid, get_global_sam_sid());
238 /*****************************************************************
239 Check if the SID is our domain SID (S-1-5-21-x-y-z).
240 *****************************************************************/
242 bool sid_check_is_in_our_domain(const struct dom_sid *sid)
244 struct dom_sid dom_sid;
247 sid_copy(&dom_sid, sid);
248 sid_split_rid(&dom_sid, &rid);
249 return sid_check_is_domain(&dom_sid);