1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
/*
Unix SMB/CIFS implementation.
Password and authentication handling
Copyright (C) Jeremy Allison 1996-2002
Copyright (C) Andrew Tridgell 2002
Copyright (C) Gerald (Jerry) Carter 2000
Copyright (C) Stefan (metze) Metzmacher 2002
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "secrets.h"
#include "dbwrap.h"
#include "../libcli/security/security.h"
/* NOTE! the global_sam_sid is the SID of our local SAM. This is only
equal to the domain SID when we are a DC, otherwise its our
workstation SID */
static struct dom_sid *global_sam_sid=NULL;
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_PASSDB
/****************************************************************************
Read a SID from a file. This is for compatibility with the old MACHINE.SID
style of SID storage
****************************************************************************/
static bool read_sid_from_file(const char *fname, struct dom_sid *sid)
{
char **lines;
int numlines;
bool ret;
lines = file_lines_load(fname, &numlines,0, NULL);
if (!lines || numlines < 1) {
TALLOC_FREE(lines);
return False;
}
ret = string_to_sid(sid, lines[0]);
TALLOC_FREE(lines);
return ret;
}
/*
generate a random sid - used to build our own sid if we don't have one
*/
static void generate_random_sid(struct dom_sid *sid)
{
int i;
uchar raw_sid_data[12];
ZERO_STRUCTP(sid);
sid->sid_rev_num = 1;
sid->id_auth[5] = 5;
sid->num_auths = 0;
sid->sub_auths[sid->num_auths++] = 21;
generate_random_buffer(raw_sid_data, 12);
for (i = 0; i < 3; i++)
sid->sub_auths[sid->num_auths++] = IVAL(raw_sid_data, i*4);
}
/****************************************************************************
Generate the global machine sid.
****************************************************************************/
static struct dom_sid *pdb_generate_sam_sid(void)
{
struct dom_sid domain_sid;
char *fname = NULL;
struct dom_sid *sam_sid;
if(!(sam_sid=SMB_MALLOC_P(struct dom_sid)))
return NULL;
if ( IS_DC ) {
if (secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
sid_copy(sam_sid, &domain_sid);
return sam_sid;
}
}
if (secrets_fetch_domain_sid(global_myname(), sam_sid)) {
/* We got our sid. If not a pdc/bdc, we're done. */
if ( !IS_DC )
return sam_sid;
if (!secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
/* No domain sid and we're a pdc/bdc. Store it */
if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
DEBUG(0,("pdb_generate_sam_sid: Can't store domain SID as a pdc/bdc.\n"));
SAFE_FREE(sam_sid);
return NULL;
}
return sam_sid;
}
if (!dom_sid_equal(&domain_sid, sam_sid)) {
/* Domain name sid doesn't match global sam sid. Re-store domain sid as 'local' sid. */
DEBUG(0,("pdb_generate_sam_sid: Mismatched SIDs as a pdc/bdc.\n"));
if (!secrets_store_domain_sid(global_myname(), &domain_sid)) {
DEBUG(0,("pdb_generate_sam_sid: Can't re-store domain SID for local sid as PDC/BDC.\n"));
SAFE_FREE(sam_sid);
return NULL;
}
return sam_sid;
}
return sam_sid;
}
/* check for an old MACHINE.SID file for backwards compatibility */
if (asprintf(&fname, "%s/MACHINE.SID", lp_private_dir()) == -1) {
SAFE_FREE(sam_sid);
return NULL;
}
if (read_sid_from_file(fname, sam_sid)) {
/* remember it for future reference and unlink the old MACHINE.SID */
if (!secrets_store_domain_sid(global_myname(), sam_sid)) {
DEBUG(0,("pdb_generate_sam_sid: Failed to store SID from file.\n"));
SAFE_FREE(fname);
SAFE_FREE(sam_sid);
return NULL;
}
unlink(fname);
if ( !IS_DC ) {
if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
DEBUG(0,("pdb_generate_sam_sid: Failed to store domain SID from file.\n"));
SAFE_FREE(fname);
SAFE_FREE(sam_sid);
return NULL;
}
}
/* Stored the old sid from MACHINE.SID successfully.*/
SAFE_FREE(fname);
return sam_sid;
}
SAFE_FREE(fname);
/* we don't have the SID in secrets.tdb, we will need to
generate one and save it */
generate_random_sid(sam_sid);
if (!secrets_store_domain_sid(global_myname(), sam_sid)) {
DEBUG(0,("pdb_generate_sam_sid: Failed to store generated machine SID.\n"));
SAFE_FREE(sam_sid);
return NULL;
}
if ( IS_DC ) {
if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
DEBUG(0,("pdb_generate_sam_sid: Failed to store generated domain SID.\n"));
SAFE_FREE(sam_sid);
return NULL;
}
}
return sam_sid;
}
/* return our global_sam_sid */
struct dom_sid *get_global_sam_sid(void)
{
struct db_context *db;
if (global_sam_sid != NULL)
return global_sam_sid;
/*
* memory for global_sam_sid is allocated in
* pdb_generate_sam_sid() as needed
*
* Note: this is garded by a transaction
* to prevent races on startup which
* can happen with some dbwrap backends
*/
db = secrets_db_ctx();
if (!db) {
smb_panic("could not open secrets db");
}
if (db->transaction_start(db) != 0) {
smb_panic("could not start transaction on secrets db");
}
if (!(global_sam_sid = pdb_generate_sam_sid())) {
db->transaction_cancel(db);
smb_panic("could not generate a machine SID");
}
if (db->transaction_commit(db) != 0) {
smb_panic("could not start commit secrets db");
}
return global_sam_sid;
}
/**
* Force get_global_sam_sid to requery the backends
*/
void reset_global_sam_sid(void)
{
SAFE_FREE(global_sam_sid);
}
/*****************************************************************
Check if the SID is our domain SID (S-1-5-21-x-y-z).
*****************************************************************/
bool sid_check_is_domain(const struct dom_sid *sid)
{
return dom_sid_equal(sid, get_global_sam_sid());
}
/*****************************************************************
Check if the SID is our domain SID (S-1-5-21-x-y-z).
*****************************************************************/
bool sid_check_is_in_our_domain(const struct dom_sid *sid)
{
struct dom_sid dom_sid;
sid_copy(&dom_sid, sid);
sid_split_rid(&dom_sid, NULL);
return sid_check_is_domain(&dom_sid);
}
|
