260 lines
6.3 KiB
C
260 lines
6.3 KiB
C
/*
|
|
* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/jail.h>
|
|
#include <sys/osd.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/zone.h>
|
|
|
|
#include <sys/policy.h>
|
|
|
|
static MALLOC_DEFINE(M_ZONES, "zones_data", "Zones data");
|
|
|
|
/*
|
|
* Structure to record list of ZFS datasets exported to a zone.
|
|
*/
|
|
typedef struct zone_dataset {
|
|
LIST_ENTRY(zone_dataset) zd_next;
|
|
char zd_dataset[0];
|
|
} zone_dataset_t;
|
|
|
|
LIST_HEAD(zone_dataset_head, zone_dataset);
|
|
|
|
static int zone_slot;
|
|
|
|
int
|
|
zone_dataset_attach(struct ucred *cred, const char *dataset, int jailid)
|
|
{
|
|
struct zone_dataset_head *head;
|
|
zone_dataset_t *zd, *zd2;
|
|
struct prison *pr;
|
|
int dofree, error;
|
|
|
|
if ((error = spl_priv_check_cred(cred, PRIV_ZFS_JAIL)) != 0)
|
|
return (error);
|
|
|
|
/* Allocate memory before we grab prison's mutex. */
|
|
zd = malloc(sizeof (*zd) + strlen(dataset) + 1, M_ZONES, M_WAITOK);
|
|
|
|
sx_slock(&allprison_lock);
|
|
pr = prison_find(jailid); /* Locks &pr->pr_mtx. */
|
|
sx_sunlock(&allprison_lock);
|
|
if (pr == NULL) {
|
|
free(zd, M_ZONES);
|
|
return (ENOENT);
|
|
}
|
|
|
|
head = osd_jail_get(pr, zone_slot);
|
|
if (head != NULL) {
|
|
dofree = 0;
|
|
LIST_FOREACH(zd2, head, zd_next) {
|
|
if (strcmp(dataset, zd2->zd_dataset) == 0) {
|
|
free(zd, M_ZONES);
|
|
error = EEXIST;
|
|
goto end;
|
|
}
|
|
}
|
|
} else {
|
|
dofree = 1;
|
|
prison_hold_locked(pr);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
head = malloc(sizeof (*head), M_ZONES, M_WAITOK);
|
|
LIST_INIT(head);
|
|
mtx_lock(&pr->pr_mtx);
|
|
error = osd_jail_set(pr, zone_slot, head);
|
|
KASSERT(error == 0, ("osd_jail_set() failed (error=%d)",
|
|
error));
|
|
}
|
|
strcpy(zd->zd_dataset, dataset);
|
|
LIST_INSERT_HEAD(head, zd, zd_next);
|
|
end:
|
|
if (dofree)
|
|
prison_free_locked(pr);
|
|
else
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
zone_dataset_detach(struct ucred *cred, const char *dataset, int jailid)
|
|
{
|
|
struct zone_dataset_head *head;
|
|
zone_dataset_t *zd;
|
|
struct prison *pr;
|
|
int error;
|
|
|
|
if ((error = spl_priv_check_cred(cred, PRIV_ZFS_JAIL)) != 0)
|
|
return (error);
|
|
|
|
sx_slock(&allprison_lock);
|
|
pr = prison_find(jailid);
|
|
sx_sunlock(&allprison_lock);
|
|
if (pr == NULL)
|
|
return (ENOENT);
|
|
head = osd_jail_get(pr, zone_slot);
|
|
if (head == NULL) {
|
|
error = ENOENT;
|
|
goto end;
|
|
}
|
|
LIST_FOREACH(zd, head, zd_next) {
|
|
if (strcmp(dataset, zd->zd_dataset) == 0)
|
|
break;
|
|
}
|
|
if (zd == NULL)
|
|
error = ENOENT;
|
|
else {
|
|
LIST_REMOVE(zd, zd_next);
|
|
free(zd, M_ZONES);
|
|
if (LIST_EMPTY(head))
|
|
osd_jail_del(pr, zone_slot);
|
|
error = 0;
|
|
}
|
|
end:
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Returns true if the named dataset is visible in the current zone.
|
|
* The 'write' parameter is set to 1 if the dataset is also writable.
|
|
*/
|
|
int
|
|
zone_dataset_visible(const char *dataset, int *write)
|
|
{
|
|
struct zone_dataset_head *head;
|
|
zone_dataset_t *zd;
|
|
struct prison *pr;
|
|
size_t len;
|
|
int ret = 0;
|
|
|
|
if (dataset[0] == '\0')
|
|
return (0);
|
|
if (INGLOBALZONE(curproc)) {
|
|
if (write != NULL)
|
|
*write = 1;
|
|
return (1);
|
|
}
|
|
pr = curthread->td_ucred->cr_prison;
|
|
mtx_lock(&pr->pr_mtx);
|
|
head = osd_jail_get(pr, zone_slot);
|
|
if (head == NULL)
|
|
goto end;
|
|
|
|
/*
|
|
* Walk the list once, looking for datasets which match exactly, or
|
|
* specify a dataset underneath an exported dataset. If found, return
|
|
* true and note that it is writable.
|
|
*/
|
|
LIST_FOREACH(zd, head, zd_next) {
|
|
len = strlen(zd->zd_dataset);
|
|
if (strlen(dataset) >= len &&
|
|
bcmp(dataset, zd->zd_dataset, len) == 0 &&
|
|
(dataset[len] == '\0' || dataset[len] == '/' ||
|
|
dataset[len] == '@')) {
|
|
if (write)
|
|
*write = 1;
|
|
ret = 1;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Walk the list a second time, searching for datasets which are parents
|
|
* of exported datasets. These should be visible, but read-only.
|
|
*
|
|
* Note that we also have to support forms such as 'pool/dataset/', with
|
|
* a trailing slash.
|
|
*/
|
|
LIST_FOREACH(zd, head, zd_next) {
|
|
len = strlen(dataset);
|
|
if (dataset[len - 1] == '/')
|
|
len--; /* Ignore trailing slash */
|
|
if (len < strlen(zd->zd_dataset) &&
|
|
bcmp(dataset, zd->zd_dataset, len) == 0 &&
|
|
zd->zd_dataset[len] == '/') {
|
|
if (write)
|
|
*write = 0;
|
|
ret = 1;
|
|
goto end;
|
|
}
|
|
}
|
|
end:
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return (ret);
|
|
}
|
|
|
|
static void
|
|
zone_destroy(void *arg)
|
|
{
|
|
struct zone_dataset_head *head;
|
|
zone_dataset_t *zd;
|
|
|
|
head = arg;
|
|
while ((zd = LIST_FIRST(head)) != NULL) {
|
|
LIST_REMOVE(zd, zd_next);
|
|
free(zd, M_ZONES);
|
|
}
|
|
free(head, M_ZONES);
|
|
}
|
|
|
|
uint32_t
|
|
zone_get_hostid(void *ptr)
|
|
{
|
|
|
|
KASSERT(ptr == NULL, ("only NULL pointer supported in %s", __func__));
|
|
|
|
return ((uint32_t)curthread->td_ucred->cr_prison->pr_hostid);
|
|
}
|
|
|
|
static void
|
|
zone_sysinit(void *arg __unused)
|
|
{
|
|
|
|
zone_slot = osd_jail_register(zone_destroy, NULL);
|
|
}
|
|
|
|
static void
|
|
zone_sysuninit(void *arg __unused)
|
|
{
|
|
|
|
osd_jail_deregister(zone_slot);
|
|
}
|
|
|
|
SYSINIT(zone_sysinit, SI_SUB_DRIVERS, SI_ORDER_ANY, zone_sysinit, NULL);
|
|
SYSUNINIT(zone_sysuninit, SI_SUB_DRIVERS, SI_ORDER_ANY, zone_sysuninit, NULL);
|