472 lines
10 KiB
C
472 lines
10 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2013, 2016 by Delphix. All rights reserved.
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*/
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/*
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* Common name validation routines for ZFS. These routines are shared by the
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* userland code as well as the ioctl() layer to ensure that we don't
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* inadvertently expose a hole through direct ioctl()s that never gets tested.
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* In userland, however, we want significantly more information about _why_ the
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* name is invalid. In the kernel, we only care whether it's valid or not.
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* Each routine therefore takes a 'namecheck_err_t' which describes exactly why
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* the name failed to validate.
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*/
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#if !defined(_KERNEL)
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#include <string.h>
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#endif
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#include <sys/dsl_dir.h>
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#include <sys/param.h>
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#include <sys/nvpair.h>
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#include "zfs_namecheck.h"
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#include "zfs_deleg.h"
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/*
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* Deeply nested datasets can overflow the stack, so we put a limit
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* in the amount of nesting a path can have. zfs_max_dataset_nesting
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* can be tuned temporarily to fix existing datasets that exceed our
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* predefined limit.
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*/
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int zfs_max_dataset_nesting = 50;
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static int
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valid_char(char c)
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{
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return ((c >= 'a' && c <= 'z') ||
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(c >= 'A' && c <= 'Z') ||
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(c >= '0' && c <= '9') ||
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c == '-' || c == '_' || c == '.' || c == ':' || c == ' ');
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}
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/*
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* Looks at a path and returns its level of nesting (depth).
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*/
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int
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get_dataset_depth(const char *path)
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{
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const char *loc = path;
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int nesting = 0;
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/*
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* Keep track of nesting until you hit the end of the
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* path or found the snapshot/bookmark separator.
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*/
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for (int i = 0; loc[i] != '\0' &&
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loc[i] != '@' &&
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loc[i] != '#'; i++) {
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if (loc[i] == '/')
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nesting++;
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}
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return (nesting);
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}
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/*
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* Snapshot names must be made up of alphanumeric characters plus the following
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* characters:
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*
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* [-_.: ]
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*
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* Returns 0 on success, -1 on error.
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*/
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int
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zfs_component_namecheck(const char *path, namecheck_err_t *why, char *what)
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{
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const char *loc;
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if (strlen(path) >= ZFS_MAX_DATASET_NAME_LEN) {
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if (why)
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*why = NAME_ERR_TOOLONG;
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return (-1);
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}
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if (path[0] == '\0') {
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if (why)
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*why = NAME_ERR_EMPTY_COMPONENT;
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return (-1);
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}
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for (loc = path; *loc; loc++) {
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if (!valid_char(*loc)) {
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if (why) {
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*why = NAME_ERR_INVALCHAR;
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*what = *loc;
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}
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return (-1);
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}
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}
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return (0);
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}
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/*
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* Permissions set name must start with the letter '@' followed by the
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* same character restrictions as snapshot names, except that the name
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* cannot exceed 64 characters.
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*
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* Returns 0 on success, -1 on error.
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*/
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int
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permset_namecheck(const char *path, namecheck_err_t *why, char *what)
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{
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if (strlen(path) >= ZFS_PERMSET_MAXLEN) {
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if (why)
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*why = NAME_ERR_TOOLONG;
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return (-1);
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}
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if (path[0] != '@') {
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if (why) {
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*why = NAME_ERR_NO_AT;
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*what = path[0];
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}
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return (-1);
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}
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return (zfs_component_namecheck(&path[1], why, what));
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}
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/*
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* Dataset paths should not be deeper than zfs_max_dataset_nesting
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* in terms of nesting.
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*
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* Returns 0 on success, -1 on error.
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*/
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int
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dataset_nestcheck(const char *path)
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{
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return ((get_dataset_depth(path) < zfs_max_dataset_nesting) ? 0 : -1);
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}
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/*
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* Entity names must be of the following form:
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*
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* [component/]*[component][(@|#)component]?
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*
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* Where each component is made up of alphanumeric characters plus the following
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* characters:
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*
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* [-_.: %]
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*
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* We allow '%' here as we use that character internally to create unique
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* names for temporary clones (for online recv).
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*
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* Returns 0 on success, -1 on error.
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*/
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int
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entity_namecheck(const char *path, namecheck_err_t *why, char *what)
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{
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const char *end;
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EQUIV(why == NULL, what == NULL);
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/*
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* Make sure the name is not too long.
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*/
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if (strlen(path) >= ZFS_MAX_DATASET_NAME_LEN) {
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if (why)
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*why = NAME_ERR_TOOLONG;
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return (-1);
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}
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/* Explicitly check for a leading slash. */
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if (path[0] == '/') {
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if (why)
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*why = NAME_ERR_LEADING_SLASH;
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return (-1);
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}
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if (path[0] == '\0') {
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if (why)
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*why = NAME_ERR_EMPTY_COMPONENT;
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return (-1);
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}
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const char *start = path;
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boolean_t found_delim = B_FALSE;
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for (;;) {
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/* Find the end of this component */
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end = start;
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while (*end != '/' && *end != '@' && *end != '#' &&
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*end != '\0')
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end++;
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if (*end == '\0' && end[-1] == '/') {
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/* trailing slashes are not allowed */
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if (why)
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*why = NAME_ERR_TRAILING_SLASH;
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return (-1);
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}
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/* Validate the contents of this component */
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for (const char *loc = start; loc != end; loc++) {
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if (!valid_char(*loc) && *loc != '%') {
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if (why) {
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*why = NAME_ERR_INVALCHAR;
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*what = *loc;
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}
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return (-1);
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}
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}
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if (*end == '\0' || *end == '/') {
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int component_length = end - start;
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/* Validate the contents of this component is not '.' */
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if (component_length == 1) {
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if (start[0] == '.') {
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if (why)
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*why = NAME_ERR_SELF_REF;
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return (-1);
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}
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}
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/* Validate the content of this component is not '..' */
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if (component_length == 2) {
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if (start[0] == '.' && start[1] == '.') {
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if (why)
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*why = NAME_ERR_PARENT_REF;
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return (-1);
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}
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}
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}
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/* Snapshot or bookmark delimiter found */
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if (*end == '@' || *end == '#') {
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/* Multiple delimiters are not allowed */
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if (found_delim != 0) {
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if (why)
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*why = NAME_ERR_MULTIPLE_DELIMITERS;
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return (-1);
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}
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found_delim = B_TRUE;
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}
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/* Zero-length components are not allowed */
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if (start == end) {
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if (why)
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*why = NAME_ERR_EMPTY_COMPONENT;
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return (-1);
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}
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/* If we've reached the end of the string, we're OK */
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if (*end == '\0')
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return (0);
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/*
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* If there is a '/' in a snapshot or bookmark name
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* then report an error
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*/
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if (*end == '/' && found_delim != 0) {
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if (why)
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*why = NAME_ERR_TRAILING_SLASH;
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return (-1);
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}
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/* Update to the next component */
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start = end + 1;
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}
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}
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/*
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* Dataset is any entity, except bookmark
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*/
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int
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dataset_namecheck(const char *path, namecheck_err_t *why, char *what)
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{
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int ret = entity_namecheck(path, why, what);
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if (ret == 0 && strchr(path, '#') != NULL) {
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if (why != NULL) {
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*why = NAME_ERR_INVALCHAR;
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*what = '#';
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}
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return (-1);
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}
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return (ret);
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}
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/*
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* Assert path is a valid bookmark name
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*/
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int
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bookmark_namecheck(const char *path, namecheck_err_t *why, char *what)
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{
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int ret = entity_namecheck(path, why, what);
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if (ret == 0 && strchr(path, '#') == NULL) {
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if (why != NULL) {
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*why = NAME_ERR_NO_POUND;
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*what = '#';
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}
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return (-1);
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}
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return (ret);
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}
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/*
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* Assert path is a valid snapshot name
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*/
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int
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snapshot_namecheck(const char *path, namecheck_err_t *why, char *what)
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{
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int ret = entity_namecheck(path, why, what);
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if (ret == 0 && strchr(path, '@') == NULL) {
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if (why != NULL) {
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*why = NAME_ERR_NO_AT;
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*what = '@';
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}
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return (-1);
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}
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return (ret);
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}
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/*
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* mountpoint names must be of the following form:
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*
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* /[component][/]*[component][/]
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*
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* Returns 0 on success, -1 on error.
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*/
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int
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mountpoint_namecheck(const char *path, namecheck_err_t *why)
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{
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const char *start, *end;
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/*
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* Make sure none of the mountpoint component names are too long.
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* If a component name is too long then the mkdir of the mountpoint
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* will fail but then the mountpoint property will be set to a value
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* that can never be mounted. Better to fail before setting the prop.
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* Extra slashes are OK, they will be tossed by the mountpoint mkdir.
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*/
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if (path == NULL || *path != '/') {
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if (why)
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*why = NAME_ERR_LEADING_SLASH;
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return (-1);
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}
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/* Skip leading slash */
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start = &path[1];
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do {
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end = start;
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while (*end != '/' && *end != '\0')
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end++;
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if (end - start >= ZFS_MAX_DATASET_NAME_LEN) {
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if (why)
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*why = NAME_ERR_TOOLONG;
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return (-1);
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}
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start = end + 1;
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} while (*end != '\0');
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return (0);
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}
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/*
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* For pool names, we have the same set of valid characters as described in
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* dataset names, with the additional restriction that the pool name must begin
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* with a letter. The pool names 'raidz' and 'mirror' are also reserved names
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* that cannot be used.
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*
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* Returns 0 on success, -1 on error.
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*/
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int
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pool_namecheck(const char *pool, namecheck_err_t *why, char *what)
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{
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const char *c;
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/*
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* Make sure the name is not too long.
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* If we're creating a pool with version >= SPA_VERSION_DSL_SCRUB (v11)
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* we need to account for additional space needed by the origin ds which
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* will also be snapshotted: "poolname"+"/"+"$ORIGIN"+"@"+"$ORIGIN".
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* Play it safe and enforce this limit even if the pool version is < 11
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* so it can be upgraded without issues.
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*/
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if (strlen(pool) >= (ZFS_MAX_DATASET_NAME_LEN - 2 -
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strlen(ORIGIN_DIR_NAME) * 2)) {
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if (why)
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*why = NAME_ERR_TOOLONG;
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return (-1);
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}
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c = pool;
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while (*c != '\0') {
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if (!valid_char(*c)) {
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if (why) {
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*why = NAME_ERR_INVALCHAR;
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*what = *c;
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}
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return (-1);
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}
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c++;
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}
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if (!(*pool >= 'a' && *pool <= 'z') &&
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!(*pool >= 'A' && *pool <= 'Z')) {
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if (why)
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*why = NAME_ERR_NOLETTER;
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return (-1);
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}
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if (strcmp(pool, "mirror") == 0 || strcmp(pool, "raidz") == 0) {
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if (why)
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*why = NAME_ERR_RESERVED;
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return (-1);
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}
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if (pool[0] == 'c' && (pool[1] >= '0' && pool[1] <= '9')) {
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if (why)
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*why = NAME_ERR_DISKLIKE;
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return (-1);
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}
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return (0);
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}
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EXPORT_SYMBOL(entity_namecheck);
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EXPORT_SYMBOL(pool_namecheck);
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EXPORT_SYMBOL(dataset_namecheck);
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EXPORT_SYMBOL(bookmark_namecheck);
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EXPORT_SYMBOL(snapshot_namecheck);
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EXPORT_SYMBOL(zfs_component_namecheck);
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EXPORT_SYMBOL(dataset_nestcheck);
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EXPORT_SYMBOL(get_dataset_depth);
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EXPORT_SYMBOL(zfs_max_dataset_nesting);
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ZFS_MODULE_PARAM(zfs, zfs_, max_dataset_nesting, INT, ZMOD_RW,
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"Limit to the amount of nesting a path can have. Defaults to 50.");
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