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/>.
26 #include "../libcli/security/security.h"
28 /* NOTE! the global_sam_sid is the SID of our local SAM. This is only
29 equal to the domain SID when we are a DC, otherwise its our
31 static struct dom_sid *global_sam_sid=NULL;
34 #define DBGC_CLASS DBGC_PASSDB
36 /****************************************************************************
37 Read a SID from a file. This is for compatibility with the old MACHINE.SID
39 ****************************************************************************/
41 static bool read_sid_from_file(const char *fname, struct dom_sid *sid)
47 lines = file_lines_load(fname, &numlines,0, NULL);
49 if (!lines || numlines < 1) {
54 ret = string_to_sid(sid, lines[0]);
60 generate a random sid - used to build our own sid if we don't have one
62 static void generate_random_sid(struct dom_sid *sid)
65 uchar raw_sid_data[12];
72 sid->sub_auths[sid->num_auths++] = 21;
74 generate_random_buffer(raw_sid_data, 12);
75 for (i = 0; i < 3; i++)
76 sid->sub_auths[sid->num_auths++] = IVAL(raw_sid_data, i*4);
79 /****************************************************************************
80 Generate the global machine sid.
81 ****************************************************************************/
83 static struct dom_sid *pdb_generate_sam_sid(void)
85 struct dom_sid domain_sid;
87 struct dom_sid *sam_sid;
89 if(!(sam_sid=SMB_MALLOC_P(struct dom_sid)))
93 if (secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
94 sid_copy(sam_sid, &domain_sid);
99 if (secrets_fetch_domain_sid(global_myname(), sam_sid)) {
101 /* We got our sid. If not a pdc/bdc, we're done. */
105 if (!secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
107 /* No domain sid and we're a pdc/bdc. Store it */
109 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
110 DEBUG(0,("pdb_generate_sam_sid: Can't store domain SID as a pdc/bdc.\n"));
117 if (!dom_sid_equal(&domain_sid, sam_sid)) {
119 /* Domain name sid doesn't match global sam sid. Re-store domain sid as 'local' sid. */
121 DEBUG(0,("pdb_generate_sam_sid: Mismatched SIDs as a pdc/bdc.\n"));
122 if (!secrets_store_domain_sid(global_myname(), &domain_sid)) {
123 DEBUG(0,("pdb_generate_sam_sid: Can't re-store domain SID for local sid as PDC/BDC.\n"));
133 /* check for an old MACHINE.SID file for backwards compatibility */
134 if (asprintf(&fname, "%s/MACHINE.SID", lp_private_dir()) == -1) {
139 if (read_sid_from_file(fname, sam_sid)) {
140 /* remember it for future reference and unlink the old MACHINE.SID */
141 if (!secrets_store_domain_sid(global_myname(), sam_sid)) {
142 DEBUG(0,("pdb_generate_sam_sid: Failed to store SID from file.\n"));
149 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
150 DEBUG(0,("pdb_generate_sam_sid: Failed to store domain SID from file.\n"));
157 /* Stored the old sid from MACHINE.SID successfully.*/
164 /* we don't have the SID in secrets.tdb, we will need to
165 generate one and save it */
166 generate_random_sid(sam_sid);
168 if (!secrets_store_domain_sid(global_myname(), sam_sid)) {
169 DEBUG(0,("pdb_generate_sam_sid: Failed to store generated machine SID.\n"));
174 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
175 DEBUG(0,("pdb_generate_sam_sid: Failed to store generated domain SID.\n"));
184 /* return our global_sam_sid */
185 struct dom_sid *get_global_sam_sid(void)
187 struct db_context *db;
189 if (global_sam_sid != NULL)
190 return global_sam_sid;
193 * memory for global_sam_sid is allocated in
194 * pdb_generate_sam_sid() as needed
196 * Note: this is garded by a transaction
197 * to prevent races on startup which
198 * can happen with some dbwrap backends
201 db = secrets_db_ctx();
203 smb_panic("could not open secrets db");
206 if (db->transaction_start(db) != 0) {
207 smb_panic("could not start transaction on secrets db");
210 if (!(global_sam_sid = pdb_generate_sam_sid())) {
211 db->transaction_cancel(db);
212 smb_panic("could not generate a machine SID");
215 if (db->transaction_commit(db) != 0) {
216 smb_panic("could not start commit secrets db");
219 return global_sam_sid;
223 * Force get_global_sam_sid to requery the backends
225 void reset_global_sam_sid(void)
227 SAFE_FREE(global_sam_sid);
230 /*****************************************************************
231 Check if the SID is our domain SID (S-1-5-21-x-y-z).
232 *****************************************************************/
234 bool sid_check_is_domain(const struct dom_sid *sid)
236 return dom_sid_equal(sid, get_global_sam_sid());
239 /*****************************************************************
240 Check if the SID is our domain SID (S-1-5-21-x-y-z).
241 *****************************************************************/
243 bool sid_check_is_in_our_domain(const struct dom_sid *sid)
245 struct dom_sid dom_sid;
248 sid_copy(&dom_sid, sid);
249 sid_split_rid(&dom_sid, &rid);
250 return sid_check_is_domain(&dom_sid);