linux/fs/hfsplus/xattr_security.c
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   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 "hfsplus_fs.h"
  11#include "xattr.h"
  12#include "acl.h"
  13
  14static int hfsplus_security_getxattr(struct dentry *dentry, const char *name,
  15                                        void *buffer, size_t size, int type)
  16{
  17        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
  18        size_t len = strlen(name);
  19
  20        if (!strcmp(name, ""))
  21                return -EINVAL;
  22
  23        if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
  24                return -EOPNOTSUPP;
  25
  26        strcpy(xattr_name, XATTR_SECURITY_PREFIX);
  27        strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
  28
  29        return hfsplus_getxattr(dentry, xattr_name, buffer, size);
  30}
  31
  32static int hfsplus_security_setxattr(struct dentry *dentry, const char *name,
  33                const void *buffer, size_t size, int flags, int type)
  34{
  35        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
  36        size_t len = strlen(name);
  37
  38        if (!strcmp(name, ""))
  39                return -EINVAL;
  40
  41        if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
  42                return -EOPNOTSUPP;
  43
  44        strcpy(xattr_name, XATTR_SECURITY_PREFIX);
  45        strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
  46
  47        return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
  48}
  49
  50static size_t hfsplus_security_listxattr(struct dentry *dentry, char *list,
  51                size_t list_size, const char *name, size_t name_len, int type)
  52{
  53        /*
  54         * This method is not used.
  55         * It is used hfsplus_listxattr() instead of generic_listxattr().
  56         */
  57        return -EOPNOTSUPP;
  58}
  59
  60static int hfsplus_initxattrs(struct inode *inode,
  61                                const struct xattr *xattr_array,
  62                                void *fs_info)
  63{
  64        const struct xattr *xattr;
  65        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
  66        size_t xattr_name_len;
  67        int err = 0;
  68
  69        for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  70                xattr_name_len = strlen(xattr->name);
  71
  72                if (xattr_name_len == 0)
  73                        continue;
  74
  75                if (xattr_name_len + XATTR_SECURITY_PREFIX_LEN >
  76                                HFSPLUS_ATTR_MAX_STRLEN)
  77                        return -EOPNOTSUPP;
  78
  79                strcpy(xattr_name, XATTR_SECURITY_PREFIX);
  80                strcpy(xattr_name +
  81                        XATTR_SECURITY_PREFIX_LEN, xattr->name);
  82                memset(xattr_name +
  83                        XATTR_SECURITY_PREFIX_LEN + xattr_name_len, 0, 1);
  84
  85                err = __hfsplus_setxattr(inode, xattr_name,
  86                                        xattr->value, xattr->value_len, 0);
  87                if (err)
  88                        break;
  89        }
  90        return err;
  91}
  92
  93int hfsplus_init_security(struct inode *inode, struct inode *dir,
  94                                const struct qstr *qstr)
  95{
  96        return security_inode_init_security(inode, dir, qstr,
  97                                        &hfsplus_initxattrs, NULL);
  98}
  99
 100int hfsplus_init_inode_security(struct inode *inode,
 101                                                struct inode *dir,
 102                                                const struct qstr *qstr)
 103{
 104        int err;
 105
 106        err = hfsplus_init_posix_acl(inode, dir);
 107        if (!err)
 108                err = hfsplus_init_security(inode, dir, qstr);
 109        return err;
 110}
 111
 112const struct xattr_handler hfsplus_xattr_security_handler = {
 113        .prefix = XATTR_SECURITY_PREFIX,
 114        .list   = hfsplus_security_listxattr,
 115        .get    = hfsplus_security_getxattr,
 116        .set    = hfsplus_security_setxattr,
 117};
 118
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