fs/hfsplus/xattr_security.c

   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
  16 static int hfsplus_security_getxattr(struct dentry *dentry, const char *name,
  17                                         void *buffer, size_t size, int type)
  18 {
  19         char *xattr_name;
  20         int res;
  21
  22         if (!strcmp(name, ""))
  23                 return -EINVAL;
  24
  25         xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
  26                 GFP_KERNEL);
  27         if (!xattr_name)
  28                 return -ENOMEM;
  29         strcpy(xattr_name, XATTR_SECURITY_PREFIX);
  30         strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
  31
  32         res = hfsplus_getxattr(dentry, xattr_name, buffer, size);
  33         kfree(xattr_name);
  34         return res;
  35 }
  36
  37 static int hfsplus_security_setxattr(struct dentry *dentry, const char *name,
  38                 const void *buffer, size_t size, int flags, int type)
  39 {
  40         char *xattr_name;
  41         int res;
  42
  43         if (!strcmp(name, ""))
  44                 return -EINVAL;
  45
  46         xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
  47                 GFP_KERNEL);
  48         if (!xattr_name)
  49                 return -ENOMEM;
  50         strcpy(xattr_name, XATTR_SECURITY_PREFIX);
  51         strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
  52
  53         res = hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
  54         kfree(xattr_name);
  55         return res;
  56 }
  57
  58 static size_t hfsplus_security_listxattr(struct dentry *dentry, char *list,
  59                 size_t list_size, const char *name, size_t name_len, int type)
  60 {
  61         /*
  62          * This method is not used.
  63          * It is used hfsplus_listxattr() instead of generic_listxattr().
  64          */
  65         return -EOPNOTSUPP;
  66 }
  67
  68 static int hfsplus_initxattrs(struct inode *inode,
  69                                 const struct xattr *xattr_array,
  70                                 void *fs_info)
  71 {
  72         const struct xattr *xattr;
  73         char *xattr_name;
  74         int err = 0;
  75
  76         xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
  77                 GFP_KERNEL);
  78         if (!xattr_name)
  79                 return -ENOMEM;
  80         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  81
  82                 if (!strcmp(xattr->name, ""))
  83                         continue;
  84
  85                 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
  86                 strcpy(xattr_name +
  87                         XATTR_SECURITY_PREFIX_LEN, xattr->name);
  88                 memset(xattr_name +
  89                         XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
  90
  91                 err = __hfsplus_setxattr(inode, xattr_name,
  92                                         xattr->value, xattr->value_len, 0);
  93                 if (err)
  94                         break;
  95         }
  96         kfree(xattr_name);
  97         return err;
  98 }
  99
 100 int hfsplus_init_security(struct inode *inode, struct inode *dir,
 101                                 const struct qstr *qstr)
 102 {
 103         return security_inode_init_security(inode, dir, qstr,
 104                                         &hfsplus_initxattrs, NULL);
 105 }
 106
 107 int hfsplus_init_inode_security(struct inode *inode,
 108                                                 struct inode *dir,
 109                                                 const struct qstr *qstr)
 110 {
 111         int err;
 112
 113         err = hfsplus_init_posix_acl(inode, dir);
 114         if (!err)
 115                 err = hfsplus_init_security(inode, dir, qstr);
 116         return err;
 117 }
 118
 119 const struct xattr_handler hfsplus_xattr_security_handler = {
 120         .prefix = XATTR_SECURITY_PREFIX,
 121         .list   = hfsplus_security_listxattr,
 122         .get    = hfsplus_security_getxattr,
 123         .set    = hfsplus_security_setxattr,
 124 };