source: trunk-3.0/source/passdb/machine_sid.c@ 103

Last change on this file since 103 was 1, checked in by Paul Smedley, 19 years ago

Initial code import
File size: 6.0 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 2 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, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22*/
23
24#include "includes.h"
25
26/* NOTE! the global_sam_sid is the SID of our local SAM. This is only
27 equal to the domain SID when we are a DC, otherwise its our
28 workstation SID */
29static DOM_SID *global_sam_sid=NULL;
30
31#undef DBGC_CLASS
32#define DBGC_CLASS DBGC_PASSDB
33
34/****************************************************************************
35 Read a SID from a file. This is for compatibility with the old MACHINE.SID
36 style of SID storage
37****************************************************************************/
38
39static BOOL read_sid_from_file(const char *fname, DOM_SID *sid)
40{
41 char **lines;
42 int numlines;
43 BOOL ret;
44
45 lines = file_lines_load(fname, &numlines,0);
46
47 if (!lines || numlines < 1) {
48 if (lines) file_lines_free(lines);
49 return False;
50 }
51
52 ret = string_to_sid(sid, lines[0]);
53 file_lines_free(lines);
54 return ret;
55}
56
57/*
58 generate a random sid - used to build our own sid if we don't have one
59*/
60static void generate_random_sid(DOM_SID *sid)
61{
62 int i;
63 uchar raw_sid_data[12];
64
65 memset((char *)sid, '\0', sizeof(*sid));
66 sid->sid_rev_num = 1;
67 sid->id_auth[5] = 5;
68 sid->num_auths = 0;
69 sid->sub_auths[sid->num_auths++] = 21;
70
71 generate_random_buffer(raw_sid_data, 12);
72 for (i = 0; i < 3; i++)
73 sid->sub_auths[sid->num_auths++] = IVAL(raw_sid_data, i*4);
74}
75
76/****************************************************************************
77 Generate the global machine sid.
78****************************************************************************/
79
80static DOM_SID *pdb_generate_sam_sid(void)
81{
82 DOM_SID domain_sid;
83 char *fname = NULL;
84 DOM_SID *sam_sid;
85
86 if(!(sam_sid=SMB_MALLOC_P(DOM_SID)))
87 return NULL;
88
89 if ( IS_DC ) {
90 if (secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
91 sid_copy(sam_sid, &domain_sid);
92 return sam_sid;
93 }
94 }
95
96 if (secrets_fetch_domain_sid(global_myname(), sam_sid)) {
97
98 /* We got our sid. If not a pdc/bdc, we're done. */
99 if ( !IS_DC )
100 return sam_sid;
101
102 if (!secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
103
104 /* No domain sid and we're a pdc/bdc. Store it */
105
106 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
107 DEBUG(0,("pdb_generate_sam_sid: Can't store domain SID as a pdc/bdc.\n"));
108 SAFE_FREE(sam_sid);
109 return NULL;
110 }
111 return sam_sid;
112 }
113
114 if (!sid_equal(&domain_sid, sam_sid)) {
115
116 /* Domain name sid doesn't match global sam sid. Re-store domain sid as 'local' sid. */
117
118 DEBUG(0,("pdb_generate_sam_sid: Mismatched SIDs as a pdc/bdc.\n"));
119 if (!secrets_store_domain_sid(global_myname(), &domain_sid)) {
120 DEBUG(0,("pdb_generate_sam_sid: Can't re-store domain SID for local sid as PDC/BDC.\n"));
121 SAFE_FREE(sam_sid);
122 return NULL;
123 }
124 return sam_sid;
125 }
126
127 return sam_sid;
128
129 }
130
131 /* check for an old MACHINE.SID file for backwards compatibility */
132 asprintf(&fname, "%s/MACHINE.SID", lp_private_dir());
133
134 if (read_sid_from_file(fname, sam_sid)) {
135 /* remember it for future reference and unlink the old MACHINE.SID */
136 if (!secrets_store_domain_sid(global_myname(), sam_sid)) {
137 DEBUG(0,("pdb_generate_sam_sid: Failed to store SID from file.\n"));
138 SAFE_FREE(fname);
139 SAFE_FREE(sam_sid);
140 return NULL;
141 }
142 unlink(fname);
143 if ( !IS_DC ) {
144 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
145 DEBUG(0,("pdb_generate_sam_sid: Failed to store domain SID from file.\n"));
146 SAFE_FREE(fname);
147 SAFE_FREE(sam_sid);
148 return NULL;
149 }
150 }
151
152 /* Stored the old sid from MACHINE.SID successfully.*/
153 SAFE_FREE(fname);
154 return sam_sid;
155 }
156
157 SAFE_FREE(fname);
158
159 /* we don't have the SID in secrets.tdb, we will need to
160 generate one and save it */
161 generate_random_sid(sam_sid);
162
163 if (!secrets_store_domain_sid(global_myname(), sam_sid)) {
164 DEBUG(0,("pdb_generate_sam_sid: Failed to store generated machine SID.\n"));
165 SAFE_FREE(sam_sid);
166 return NULL;
167 }
168 if ( IS_DC ) {
169 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
170 DEBUG(0,("pdb_generate_sam_sid: Failed to store generated domain SID.\n"));
171 SAFE_FREE(sam_sid);
172 return NULL;
173 }
174 }
175
176 return sam_sid;
177}
178
179/* return our global_sam_sid */
180DOM_SID *get_global_sam_sid(void)
181{
182 if (global_sam_sid != NULL)
183 return global_sam_sid;
184
185 /* memory for global_sam_sid is allocated in
186 pdb_generate_sam_sid() as needed */
187
188 if (!(global_sam_sid = pdb_generate_sam_sid())) {
189 smb_panic("Could not generate a machine SID\n");
190 }
191
192 return global_sam_sid;
193}
194
195/**
196 * Force get_global_sam_sid to requery the backends
197 */
198void reset_global_sam_sid(void)
199{
200 SAFE_FREE(global_sam_sid);
201}
202
203/*****************************************************************
204 Check if the SID is our domain SID (S-1-5-21-x-y-z).
205*****************************************************************/
206
207BOOL sid_check_is_domain(const DOM_SID *sid)
208{
209 return sid_equal(sid, get_global_sam_sid());
210}
211
212/*****************************************************************
213 Check if the SID is our domain SID (S-1-5-21-x-y-z).
214*****************************************************************/
215
216BOOL sid_check_is_in_our_domain(const DOM_SID *sid)
217{
218 DOM_SID dom_sid;
219 uint32 rid;
220
221 sid_copy(&dom_sid, sid);
222 sid_split_rid(&dom_sid, &rid);
223
224 return sid_equal(&dom_sid, get_global_sam_sid());
225}
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