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1.1 root 1: /*
2: * Virtio 9p system.posix* xattr callback
3: *
4: * Copyright IBM, Corp. 2010
5: *
6: * Authors:
7: * Aneesh Kumar K.V <[email protected]>
8: *
9: * This work is licensed under the terms of the GNU GPL, version 2. See
10: * the COPYING file in the top-level directory.
11: *
12: */
13:
14: #include <sys/types.h>
15: #include <attr/xattr.h>
16: #include "hw/virtio.h"
17: #include "virtio-9p.h"
18: #include "fsdev/file-op-9p.h"
19: #include "virtio-9p-xattr.h"
20:
21: #define MAP_ACL_ACCESS "user.virtfs.system.posix_acl_access"
22: #define MAP_ACL_DEFAULT "user.virtfs.system.posix_acl_default"
23: #define ACL_ACCESS "system.posix_acl_access"
24: #define ACL_DEFAULT "system.posix_acl_default"
25:
26: static ssize_t mp_pacl_getxattr(FsContext *ctx, const char *path,
27: const char *name, void *value, size_t size)
28: {
29: char buffer[PATH_MAX];
30: return lgetxattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS, value, size);
31: }
32:
33: static ssize_t mp_pacl_listxattr(FsContext *ctx, const char *path,
34: char *name, void *value, size_t osize)
35: {
36: ssize_t len = sizeof(ACL_ACCESS);
37:
38: if (!value) {
39: return len;
40: }
41:
42: if (osize < len) {
43: errno = ERANGE;
44: return -1;
45: }
46:
47: strncpy(value, ACL_ACCESS, len);
48: return 0;
49: }
50:
51: static int mp_pacl_setxattr(FsContext *ctx, const char *path, const char *name,
52: void *value, size_t size, int flags)
53: {
54: char buffer[PATH_MAX];
55: return lsetxattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS, value,
56: size, flags);
57: }
58:
59: static int mp_pacl_removexattr(FsContext *ctx,
60: const char *path, const char *name)
61: {
62: int ret;
63: char buffer[PATH_MAX];
64: ret = lremovexattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS);
65: if (ret == -1 && errno == ENODATA) {
66: /*
67: * We don't get ENODATA error when trying to remove a
68: * posix acl that is not present. So don't throw the error
69: * even in case of mapped security model
70: */
71: errno = 0;
72: ret = 0;
73: }
74: return ret;
75: }
76:
77: static ssize_t mp_dacl_getxattr(FsContext *ctx, const char *path,
78: const char *name, void *value, size_t size)
79: {
80: char buffer[PATH_MAX];
81: return lgetxattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT, value, size);
82: }
83:
84: static ssize_t mp_dacl_listxattr(FsContext *ctx, const char *path,
85: char *name, void *value, size_t osize)
86: {
87: ssize_t len = sizeof(ACL_DEFAULT);
88:
89: if (!value) {
90: return len;
91: }
92:
93: if (osize < len) {
94: errno = ERANGE;
95: return -1;
96: }
97:
98: strncpy(value, ACL_DEFAULT, len);
99: return 0;
100: }
101:
102: static int mp_dacl_setxattr(FsContext *ctx, const char *path, const char *name,
103: void *value, size_t size, int flags)
104: {
105: char buffer[PATH_MAX];
106: return lsetxattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT, value,
107: size, flags);
108: }
109:
110: static int mp_dacl_removexattr(FsContext *ctx,
111: const char *path, const char *name)
112: {
113: int ret;
114: char buffer[PATH_MAX];
115: ret = lremovexattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT);
116: if (ret == -1 && errno == ENODATA) {
117: /*
118: * We don't get ENODATA error when trying to remove a
119: * posix acl that is not present. So don't throw the error
120: * even in case of mapped security model
121: */
122: errno = 0;
123: ret = 0;
124: }
125: return ret;
126: }
127:
128:
129: XattrOperations mapped_pacl_xattr = {
130: .name = "system.posix_acl_access",
131: .getxattr = mp_pacl_getxattr,
132: .setxattr = mp_pacl_setxattr,
133: .listxattr = mp_pacl_listxattr,
134: .removexattr = mp_pacl_removexattr,
135: };
136:
137: XattrOperations mapped_dacl_xattr = {
138: .name = "system.posix_acl_default",
139: .getxattr = mp_dacl_getxattr,
140: .setxattr = mp_dacl_setxattr,
141: .listxattr = mp_dacl_listxattr,
142: .removexattr = mp_dacl_removexattr,
143: };
144:
145: XattrOperations passthrough_acl_xattr = {
146: .name = "system.posix_acl_",
147: .getxattr = pt_getxattr,
148: .setxattr = pt_setxattr,
149: .listxattr = pt_listxattr,
150: .removexattr = pt_removexattr,
151: };
152:
153: XattrOperations none_acl_xattr = {
154: .name = "system.posix_acl_",
155: .getxattr = notsup_getxattr,
156: .setxattr = notsup_setxattr,
157: .listxattr = notsup_listxattr,
158: .removexattr = notsup_removexattr,
159: };
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