source: vendor/current/source3/passdb/machine_sid.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 6.6 KB
Line 
1/*
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
8
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.
13
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.
18
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/>.
21*/
22
23#include "includes.h"
24#include "passdb/machine_sid.h"
25#include "secrets.h"
26#include "dbwrap/dbwrap.h"
27#include "../libcli/security/security.h"
28
29/* NOTE! the global_sam_sid is the SID of our local SAM. This is only
30 equal to the domain SID when we are a DC, otherwise its our
31 workstation SID */
32static struct dom_sid *global_sam_sid=NULL;
33
34#undef DBGC_CLASS
35#define DBGC_CLASS DBGC_PASSDB
36
37/****************************************************************************
38 Read a SID from a file. This is for compatibility with the old MACHINE.SID
39 style of SID storage
40****************************************************************************/
41
42static bool read_sid_from_file(const char *fname, struct dom_sid *sid)
43{
44 char **lines;
45 int numlines;
46 bool ret;
47
48 lines = file_lines_load(fname, &numlines,0, NULL);
49
50 if (!lines || numlines < 1) {
51 TALLOC_FREE(lines);
52 return False;
53 }
54
55 ret = string_to_sid(sid, lines[0]);
56 TALLOC_FREE(lines);
57 return ret;
58}
59
60/*
61 generate a random sid - used to build our own sid if we don't have one
62*/
63static void generate_random_sid(struct dom_sid *sid)
64{
65 int i;
66 uchar raw_sid_data[12];
67
68 ZERO_STRUCTP(sid);
69
70 sid->sid_rev_num = 1;
71 sid->id_auth[5] = 5;
72 sid->num_auths = 0;
73 sid->sub_auths[sid->num_auths++] = 21;
74
75 generate_random_buffer(raw_sid_data, 12);
76 for (i = 0; i < 3; i++)
77 sid->sub_auths[sid->num_auths++] = IVAL(raw_sid_data, i*4);
78}
79
80/****************************************************************************
81 Generate the global machine sid.
82****************************************************************************/
83
84static struct dom_sid *pdb_generate_sam_sid(void)
85{
86 struct dom_sid domain_sid;
87 char *fname = NULL;
88 struct dom_sid *sam_sid;
89
90 if(!(sam_sid=SMB_MALLOC_P(struct dom_sid)))
91 return NULL;
92
93 if ( IS_DC ) {
94 if (secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
95 sid_copy(sam_sid, &domain_sid);
96 return sam_sid;
97 }
98 }
99
100 if (secrets_fetch_domain_sid(lp_netbios_name(), sam_sid)) {
101
102 /* We got our sid. If not a pdc/bdc, we're done. */
103 if ( !IS_DC )
104 return sam_sid;
105
106 if (!secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
107
108 /* No domain sid and we're a pdc/bdc. Store it */
109
110 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
111 DEBUG(0,("pdb_generate_sam_sid: Can't store domain SID as a pdc/bdc.\n"));
112 SAFE_FREE(sam_sid);
113 return NULL;
114 }
115 return sam_sid;
116 }
117
118 if (!dom_sid_equal(&domain_sid, sam_sid)) {
119
120 /* Domain name sid doesn't match global sam sid. Re-store domain sid as 'local' sid. */
121
122 DEBUG(0,("pdb_generate_sam_sid: Mismatched SIDs as a pdc/bdc.\n"));
123 if (!secrets_store_domain_sid(lp_netbios_name(), &domain_sid)) {
124 DEBUG(0,("pdb_generate_sam_sid: Can't re-store domain SID for local sid as PDC/BDC.\n"));
125 SAFE_FREE(sam_sid);
126 return NULL;
127 }
128 return sam_sid;
129 }
130
131 return sam_sid;
132 }
133
134 /* check for an old MACHINE.SID file for backwards compatibility */
135 if (asprintf(&fname, "%s/MACHINE.SID", lp_private_dir()) == -1) {
136 SAFE_FREE(sam_sid);
137 return NULL;
138 }
139
140 if (read_sid_from_file(fname, sam_sid)) {
141 /* remember it for future reference and unlink the old MACHINE.SID */
142 if (!secrets_store_domain_sid(lp_netbios_name(), sam_sid)) {
143 DEBUG(0,("pdb_generate_sam_sid: Failed to store SID from file.\n"));
144 SAFE_FREE(fname);
145 SAFE_FREE(sam_sid);
146 return NULL;
147 }
148 unlink(fname);
149 if ( !IS_DC ) {
150 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
151 DEBUG(0,("pdb_generate_sam_sid: Failed to store domain SID from file.\n"));
152 SAFE_FREE(fname);
153 SAFE_FREE(sam_sid);
154 return NULL;
155 }
156 }
157
158 /* Stored the old sid from MACHINE.SID successfully.*/
159 SAFE_FREE(fname);
160 return sam_sid;
161 }
162
163 SAFE_FREE(fname);
164
165 /* we don't have the SID in secrets.tdb, we will need to
166 generate one and save it */
167 generate_random_sid(sam_sid);
168
169 if (!secrets_store_domain_sid(lp_netbios_name(), sam_sid)) {
170 DEBUG(0,("pdb_generate_sam_sid: Failed to store generated machine SID.\n"));
171 SAFE_FREE(sam_sid);
172 return NULL;
173 }
174 if ( IS_DC ) {
175 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
176 DEBUG(0,("pdb_generate_sam_sid: Failed to store generated domain SID.\n"));
177 SAFE_FREE(sam_sid);
178 return NULL;
179 }
180 }
181
182 return sam_sid;
183}
184
185/* return our global_sam_sid */
186struct dom_sid *get_global_sam_sid(void)
187{
188 struct db_context *db;
189
190 if (global_sam_sid != NULL)
191 return global_sam_sid;
192
193 /*
194 * memory for global_sam_sid is allocated in
195 * pdb_generate_sam_sid() as needed
196 *
197 * Note: this is guarded by a transaction
198 * to prevent races on startup which
199 * can happen with some dbwrap backends
200 */
201
202 db = secrets_db_ctx();
203 if (!db) {
204 smb_panic("could not open secrets db");
205 }
206
207 if (dbwrap_transaction_start(db) != 0) {
208 smb_panic("could not start transaction on secrets db");
209 }
210
211 if (!(global_sam_sid = pdb_generate_sam_sid())) {
212 dbwrap_transaction_cancel(db);
213 smb_panic("could not generate a machine SID");
214 }
215
216 if (dbwrap_transaction_commit(db) != 0) {
217 smb_panic("could not start commit secrets db");
218 }
219
220 return global_sam_sid;
221}
222
223/**
224 * Force get_global_sam_sid to requery the backends
225 */
226void reset_global_sam_sid(void)
227{
228 SAFE_FREE(global_sam_sid);
229}
230
231/*****************************************************************
232 Check if the SID is our sam SID (S-1-5-21-x-y-z).
233*****************************************************************/
234
235bool sid_check_is_our_sam(const struct dom_sid *sid)
236{
237 return dom_sid_equal(sid, get_global_sam_sid());
238}
239
240/*****************************************************************
241 Check if the SID is our domain SID (S-1-5-21-x-y-z).
242*****************************************************************/
243
244bool sid_check_is_in_our_sam(const struct dom_sid *sid)
245{
246 struct dom_sid dom_sid;
247
248 sid_copy(&dom_sid, sid);
249 sid_split_rid(&dom_sid, NULL);
250 return sid_check_is_our_sam(&dom_sid);
251}
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