1/*
2 * linux/fs/hfsplus/xattr_trusted.c
3 *
4 * Vyacheslav Dubeyko <slava@dubeyko.com>
5 *
6 * Handler for storing security labels as extended attributes.
7 */
8
9#include <linux/security.h>
10#include <linux/nls.h>
11
12#include "hfsplus_fs.h"
13#include "xattr.h"
14#include "acl.h"
15
16static int hfsplus_security_getxattr(const struct xattr_handler *handler,
17				     struct dentry *dentry, const char *name,
18				     void *buffer, size_t size)
19{
20	return hfsplus_getxattr(dentry, name, buffer, size,
21				XATTR_SECURITY_PREFIX,
22				XATTR_SECURITY_PREFIX_LEN);
23}
24
25static int hfsplus_security_setxattr(const struct xattr_handler *handler,
26				     struct dentry *dentry, const char *name,
27				     const void *buffer, size_t size, int flags)
28{
29	return hfsplus_setxattr(dentry, name, buffer, size, flags,
30				XATTR_SECURITY_PREFIX,
31				XATTR_SECURITY_PREFIX_LEN);
32}
33
34static int hfsplus_initxattrs(struct inode *inode,
35				const struct xattr *xattr_array,
36				void *fs_info)
37{
38	const struct xattr *xattr;
39	char *xattr_name;
40	int err = 0;
41
42	xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
43		GFP_KERNEL);
44	if (!xattr_name)
45		return -ENOMEM;
46	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
47
48		if (!strcmp(xattr->name, ""))
49			continue;
50
51		strcpy(xattr_name, XATTR_SECURITY_PREFIX);
52		strcpy(xattr_name +
53			XATTR_SECURITY_PREFIX_LEN, xattr->name);
54		memset(xattr_name +
55			XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
56
57		err = __hfsplus_setxattr(inode, xattr_name,
58					xattr->value, xattr->value_len, 0);
59		if (err)
60			break;
61	}
62	kfree(xattr_name);
63	return err;
64}
65
66int hfsplus_init_security(struct inode *inode, struct inode *dir,
67				const struct qstr *qstr)
68{
69	return security_inode_init_security(inode, dir, qstr,
70					&hfsplus_initxattrs, NULL);
71}
72
73int hfsplus_init_inode_security(struct inode *inode,
74						struct inode *dir,
75						const struct qstr *qstr)
76{
77	int err;
78
79	err = hfsplus_init_posix_acl(inode, dir);
80	if (!err)
81		err = hfsplus_init_security(inode, dir, qstr);
82	return err;
83}
84
85const struct xattr_handler hfsplus_xattr_security_handler = {
86	.prefix	= XATTR_SECURITY_PREFIX,
87	.get	= hfsplus_security_getxattr,
88	.set	= hfsplus_security_setxattr,
89};
90