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
|
/*
* fs/cifs/cifsacl.c
*
* Copyright (C) International Business Machines Corp., 2007
* Author(s): Steve French (sfrench@us.ibm.com)
*
* Contains the routines for mapping CIFS/NTFS ACLs
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsacl.h"
#include "cifsproto.h"
#include "cifs_debug.h"
/* security id for everyone */
static const struct cifs_sid sid_everyone =
{1, 1, {0, 0, 0, 0, 0, 0}, {} };
/* group users */
static const struct cifs_sid sid_user =
{1, 2 , {0, 0, 0, 0, 0, 5}, {} };
static void parse_ace(struct cifs_ace *pace, char *end_of_acl)
{
int i;
int num_subauth;
__u32 *psub_auth;
/* validate that we do not go past end of acl */
if (end_of_acl < (char *)pace + sizeof(struct cifs_ace)) {
cERROR(1, ("ACL too small to parse ACE"));
return;
}
num_subauth = cpu_to_le32(pace->num_subauth);
if (num_subauth) {
psub_auth = (__u32 *)((char *)pace + sizeof(struct cifs_ace));
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("ACE revision %d num_subauth %d",
pace->revision, pace->num_subauth));
for (i = 0; i < num_subauth; ++i) {
cFYI(1, ("ACE sub_auth[%d]: 0x%x", i,
le32_to_cpu(psub_auth[i])));
}
/* BB add length check to make sure that we do not have huge
num auths and therefore go off the end */
cFYI(1, ("RID %d", le32_to_cpu(psub_auth[num_subauth-1])));
#endif
}
return;
}
static void parse_ntace(struct cifs_ntace *pntace, char *end_of_acl)
{
/* validate that we do not go past end of acl */
if (end_of_acl < (char *)pntace + sizeof(struct cifs_ntace)) {
cERROR(1, ("ACL too small to parse NT ACE"));
return;
}
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("NTACE type %d flags 0x%x size %d, access Req 0x%x",
pntace->type, pntace->flags, pntace->size,
pntace->access_req));
#endif
return;
}
static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl)
{
int i;
int num_aces = 0;
int acl_size;
char *acl_base;
struct cifs_ntace **ppntace;
struct cifs_ace **ppace;
/* BB need to add parm so we can store the SID BB */
/* validate that we do not go past end of acl */
if (end_of_acl < (char *)pdacl + pdacl->size) {
cERROR(1, ("ACL too small to parse DACL"));
return;
}
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("DACL revision %d size %d num aces %d",
pdacl->revision, pdacl->size, pdacl->num_aces));
#endif
acl_base = (char *)pdacl;
acl_size = sizeof(struct cifs_acl);
num_aces = cpu_to_le32(pdacl->num_aces);
if (num_aces > 0) {
ppntace = kmalloc(num_aces * sizeof(struct cifs_ntace *),
GFP_KERNEL);
ppace = kmalloc(num_aces * sizeof(struct cifs_ace *),
GFP_KERNEL);
/* cifscred->cecount = pdacl->num_aces;
cifscred->ntaces = kmalloc(num_aces *
sizeof(struct cifs_ntace *), GFP_KERNEL);
cifscred->aces = kmalloc(num_aces *
sizeof(struct cifs_ace *), GFP_KERNEL);*/
for (i = 0; i < num_aces; ++i) {
ppntace[i] = (struct cifs_ntace *)
(acl_base + acl_size);
ppace[i] = (struct cifs_ace *) ((char *)ppntace[i] +
sizeof(struct cifs_ntace));
parse_ntace(ppntace[i], end_of_acl);
parse_ace(ppace[i], end_of_acl);
/* memcpy((void *)(&(cifscred->ntaces[i])),
(void *)ppntace[i],
sizeof(struct cifs_ntace));
memcpy((void *)(&(cifscred->aces[i])),
(void *)ppace[i],
sizeof(struct cifs_ace)); */
acl_base = (char *)ppntace[i];
acl_size = cpu_to_le32(ppntace[i]->size);
}
kfree(ppace);
kfree(ppntace);
}
return;
}
static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
{
int i;
int num_subauth;
__u32 *psub_auth;
/* BB need to add parm so we can store the SID BB */
/* validate that we do not go past end of acl */
if (end_of_acl < (char *)psid + sizeof(struct cifs_sid)) {
cERROR(1, ("ACL too small to parse SID"));
return -EINVAL;
}
num_subauth = cpu_to_le32(psid->num_subauth);
if (num_subauth) {
psub_auth = (__u32 *)((char *)psid + sizeof(struct cifs_sid));
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("SID revision %d num_auth %d First subauth 0x%x",
psid->revision, psid->num_subauth, psid->sub_auth[0]));
for (i = 0; i < num_subauth; ++i) {
cFYI(1, ("SID sub_auth[%d]: 0x%x ", i,
le32_to_cpu(psub_auth[i])));
}
/* BB add length check to make sure that we do not have huge
num auths and therefore go off the end */
cFYI(1, ("RID 0x%x",
le32_to_cpu(psid->sub_auth[psid->num_subauth])));
#endif
}
return 0;
}
/* Convert CIFS ACL to POSIX form */
int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
{
int rc;
struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
struct cifs_acl *dacl_ptr; /* no need for SACL ptr */
char *end_of_acl = ((char *)pntsd) + acl_len;
owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
cpu_to_le32(pntsd->osidoffset));
group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
cpu_to_le32(pntsd->gsidoffset));
dacl_ptr = (struct cifs_acl *)((char *)pntsd +
cpu_to_le32(pntsd->dacloffset));
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x "
"sacloffset 0x%x dacloffset 0x%x",
pntsd->revision, pntsd->type,
pntsd->osidoffset, pntsd->gsidoffset, pntsd->sacloffset,
pntsd->dacloffset));
#endif
rc = parse_sid(owner_sid_ptr, end_of_acl);
if (rc)
return rc;
rc = parse_sid(group_sid_ptr, end_of_acl);
if (rc)
return rc;
parse_dacl(dacl_ptr, end_of_acl);
/* cifscred->uid = owner_sid_ptr->rid;
cifscred->gid = group_sid_ptr->rid;
memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr,
sizeof (struct cifs_sid));
memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr,
sizeof (struct cifs_sid)); */
return (0);
}
|
