path: root/security/tomoyo/file.c

/*
 * security/tomoyo/file.c
 *
 * Pathname restriction functions.
 *
 * Copyright (C) 2005-2010  NTT DATA CORPORATION
 */

#include "common.h"
#include <linux/slab.h>

/* Keyword array for operations with one pathname. */
const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
	[TOMOYO_TYPE_EXECUTE]    = "execute",
	[TOMOYO_TYPE_READ]       = "read",
	[TOMOYO_TYPE_WRITE]      = "write",
	[TOMOYO_TYPE_APPEND]     = "append",
	[TOMOYO_TYPE_UNLINK]     = "unlink",
	[TOMOYO_TYPE_GETATTR]    = "getattr",
	[TOMOYO_TYPE_RMDIR]      = "rmdir",
	[TOMOYO_TYPE_TRUNCATE]   = "truncate",
	[TOMOYO_TYPE_SYMLINK]    = "symlink",
	[TOMOYO_TYPE_CHROOT]     = "chroot",
	[TOMOYO_TYPE_UMOUNT]     = "unmount",
};

/* Keyword array for operations with one pathname and three numbers. */
const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION] = {
	[TOMOYO_TYPE_MKBLOCK]    = "mkblock",
	[TOMOYO_TYPE_MKCHAR]     = "mkchar",
};

/* Keyword array for operations with two pathnames. */
const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = {
	[TOMOYO_TYPE_LINK]       = "link",
	[TOMOYO_TYPE_RENAME]     = "rename",
	[TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root",
};

/* Keyword array for operations with one pathname and one number. */
const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
	[TOMOYO_TYPE_CREATE]     = "create",
	[TOMOYO_TYPE_MKDIR]      = "mkdir",
	[TOMOYO_TYPE_MKFIFO]     = "mkfifo",
	[TOMOYO_TYPE_MKSOCK]     = "mksock",
	[TOMOYO_TYPE_IOCTL]      = "ioctl",
	[TOMOYO_TYPE_CHMOD]      = "chmod",
	[TOMOYO_TYPE_CHOWN]      = "chown",
	[TOMOYO_TYPE_CHGRP]      = "chgrp",
};

/*
 * Mapping table from "enum tomoyo_path_acl_index" to "enum tomoyo_mac_index".
 */
static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = {
	[TOMOYO_TYPE_EXECUTE]    = TOMOYO_MAC_FILE_EXECUTE,
	[TOMOYO_TYPE_READ]       = TOMOYO_MAC_FILE_OPEN,
	[TOMOYO_TYPE_WRITE]      = TOMOYO_MAC_FILE_OPEN,
	[TOMOYO_TYPE_APPEND]     = TOMOYO_MAC_FILE_OPEN,
	[TOMOYO_TYPE_UNLINK]     = TOMOYO_MAC_FILE_UNLINK,
	[TOMOYO_TYPE_GETATTR]    = TOMOYO_MAC_FILE_GETATTR,
	[TOMOYO_TYPE_RMDIR]      = TOMOYO_MAC_FILE_RMDIR,
	[TOMOYO_TYPE_TRUNCATE]   = TOMOYO_MAC_FILE_TRUNCATE,
	[TOMOYO_TYPE_SYMLINK]    = TOMOYO_MAC_FILE_SYMLINK,
	[TOMOYO_TYPE_CHROOT]     = TOMOYO_MAC_FILE_CHROOT,
	[TOMOYO_TYPE_UMOUNT]     = TOMOYO_MAC_FILE_UMOUNT,
};

/*
 * Mapping table from "enum tomoyo_mkdev_acl_index" to "enum tomoyo_mac_index".
 */
const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = {
	[TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK,
	[TOMOYO_TYPE_MKCHAR]  = TOMOYO_MAC_FILE_MKCHAR,
};

/*
 * Mapping table from "enum tomoyo_path2_acl_index" to "enum tomoyo_mac_index".
 */
const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = {
	[TOMOYO_TYPE_LINK]       = TOMOYO_MAC_FILE_LINK,
	[TOMOYO_TYPE_RENAME]     = TOMOYO_MAC_FILE_RENAME,
	[TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT,
};

/*
 * Mapping table from "enum tomoyo_path_number_acl_index" to
 * "enum tomoyo_mac_index".
 */
const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
	[TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE,
	[TOMOYO_TYPE_MKDIR]  = TOMOYO_MAC_FILE_MKDIR,
	[TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO,
	[TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK,
	[TOMOYO_TYPE_IOCTL]  = TOMOYO_MAC_FILE_IOCTL,
	[TOMOYO_TYPE_CHMOD]  = TOMOYO_MAC_FILE_CHMOD,
	[TOMOYO_TYPE_CHOWN]  = TOMOYO_MAC_FILE_CHOWN,
	[TOMOYO_TYPE_CHGRP]  = TOMOYO_MAC_FILE_CHGRP,
};

/**
 * tomoyo_put_name_union - Drop reference on "struct tomoyo_name_union".
 *
 * @ptr: Pointer to "struct tomoyo_name_union".
 *
 * Returns nothing.
 */
void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
{
	tomoyo_put_group(ptr->group);
	tomoyo_put_name(ptr->filename);
}

/**
 * tomoyo_compare_name_union - Check whether a name matches "struct tomoyo_name_union" or not.
 *
 * @name: Pointer to "struct tomoyo_path_info".
 * @ptr:  Pointer to "struct tomoyo_name_union".
 *
 * Returns "struct tomoyo_path_info" if @name matches @ptr, NULL otherwise.
 */
const struct tomoyo_path_info *
tomoyo_compare_name_union(const struct tomoyo_path_info *name,
			  const struct tomoyo_name_union *ptr)
{
	if (ptr->group)
		return tomoyo_path_matches_group(name, ptr->group);
	if (tomoyo_path_matches_pattern(name, ptr->filename))
		return ptr->filename;
	return NULL;
}

/**
 * tomoyo_put_number_union - Drop reference on "struct tomoyo_number_union".
 *
 * @ptr: Pointer to "struct tomoyo_number_union".
 *
 * Returns nothing.
 */
void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
{
	tomoyo_put_group(ptr->group);
}

/**
 * tomoyo_compare_number_union - Check whether a value matches "struct tomoyo_number_union" or not.
 *
 * @value: Number to check.
 * @ptr:   Pointer to "struct tomoyo_number_union".
 *
 * Returns true if @value matches @ptr, false otherwise.
 */
bool tomoyo_compare_number_union(const unsigned long value,
				 const struct tomoyo_number_union *ptr)
{
	if (ptr->