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
|
/*
* 9p system.posix* xattr callback
*
* Copyright IBM, Corp. 2010
*
* Authors:
* Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
/*
* Not so fast! You might want to read the 9p developer docs first:
* https://wiki.qemu.org/Documentation/9p
*/
#include "qemu/osdep.h"
#include "qemu/xattr.h"
#include "9p.h"
#include "fsdev/file-op-9p.h"
#include "9p-xattr.h"
#define MAP_ACL_ACCESS "user.virtfs.system.posix_acl_access"
#define MAP_ACL_DEFAULT "user.virtfs.system.posix_acl_default"
#define ACL_ACCESS "system.posix_acl_access"
#define ACL_DEFAULT "system.posix_acl_default"
static ssize_t mp_pacl_getxattr(FsContext *ctx, const char *path,
const char *name, void *value, size_t size)
{
return local_getxattr_nofollow(ctx, path, MAP_ACL_ACCESS, value, size);
}
static ssize_t mp_pacl_listxattr(FsContext *ctx, const char *path,
char *name, void *value, size_t osize)
{
ssize_t len = sizeof(ACL_ACCESS);
if (!value) {
return len;
}
if (osize < len) {
errno = ERANGE;
return -1;
}
/* len includes the trailing NUL */
memcpy(value, ACL_ACCESS, len);
return 0;
}
static int mp_pacl_setxattr(FsContext *ctx, const char *path, const char *name,
void *value, size_t size, int flags)
{
return local_setxattr_nofollow(ctx, path, MAP_ACL_ACCESS, value, size,
flags);
}
static int mp_pacl_removexattr(FsContext *ctx,
const char *path, const char *name)
{
int ret;
ret = local_removexattr_nofollow(ctx, path, MAP_ACL_ACCESS);
if (ret == -1 && errno == ENODATA) {
/*
* We don't get ENODATA error when trying to remove a
* posix acl that is not present. So don't throw the error
* even in case of mapped security model
*/
errno = 0;
ret = 0;
}
return ret;
}
static ssize_t mp_dacl_getxattr(FsContext *ctx, const char *path,
const char *name, void *value, size_t size)
{
return local_getxattr_nofollow(ctx, path, MAP_ACL_DEFAULT, value, size);
}
static ssize_t mp_dacl_listxattr(FsContext *ctx, const char *path,
char *name, void *value, size_t osize)
{
ssize_t len = sizeof(ACL_DEFAULT);
if (!value) {
return len;
}
if (osize < len) {
errno = ERANGE;
return -1;
}
/* len includes the trailing NUL */
memcpy(value, ACL_DEFAULT, len);
return 0;
}
static int mp_dacl_setxattr(FsContext *ctx, const char *path, const char *name,
void *value, size_t size, int flags)
{
return local_setxattr_nofollow(ctx, path, MAP_ACL_DEFAULT, value, size,
flags);
}
static int mp_dacl_removexattr(FsContext *ctx,
const char *path, const char *name)
{
int ret;
ret = local_removexattr_nofollow(ctx, path, MAP_ACL_DEFAULT);
if (ret == -1 && errno == ENODATA) {
/*
* We don't get ENODATA error when trying to remove a
* posix acl that is not present. So don't throw the error
* even in case of mapped security model
*/
errno = 0;
ret = 0;
}
return ret;
}
XattrOperations mapped_pacl_xattr = {
.name = "system.posix_acl_access",
.getxattr = mp_pacl_getxattr,
.setxattr = mp_pacl_setxattr,
.listxattr = mp_pacl_listxattr,
.removexattr = mp_pacl_removexattr,
};
XattrOperations mapped_dacl_xattr = {
.name = "system.posix_acl_default",
.getxattr = mp_dacl_getxattr,
.setxattr = mp_dacl_setxattr,
.listxattr = mp_dacl_listxattr,
.removexattr = mp_dacl_removexattr,
};
XattrOperations passthrough_acl_xattr = {
.name = "system.posix_acl_",
.getxattr = pt_getxattr,
.setxattr = pt_setxattr,
.listxattr = pt_listxattr,
.removexattr = pt_removexattr,
};
XattrOperations none_acl_xattr = {
.name = "system.posix_acl_",
.getxattr = notsup_getxattr,
.setxattr = notsup_setxattr,
.listxattr = notsup_listxattr,
.removexattr = notsup_removexattr,
};
|
