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zfs/module/zfs/dsl_deleg.c

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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* DSL permissions are stored in a two level zap attribute
* mechanism. The first level identifies the "class" of
* entry. The class is identified by the first 2 letters of
* the attribute. The second letter "l" or "d" identifies whether
* it is a local or descendent permission. The first letter
* identifies the type of entry.
*
* ul$<id> identifies permissions granted locally for this userid.
* ud$<id> identifies permissions granted on descendent datasets for
* this userid.
* Ul$<id> identifies permission sets granted locally for this userid.
* Ud$<id> identifies permission sets granted on descendent datasets for
* this userid.
* gl$<id> identifies permissions granted locally for this groupid.
* gd$<id> identifies permissions granted on descendent datasets for
* this groupid.
* Gl$<id> identifies permission sets granted locally for this groupid.
* Gd$<id> identifies permission sets granted on descendent datasets for
* this groupid.
* el$ identifies permissions granted locally for everyone.
* ed$ identifies permissions granted on descendent datasets
* for everyone.
* El$ identifies permission sets granted locally for everyone.
* Ed$ identifies permission sets granted to descendent datasets for
* everyone.
* c-$ identifies permission to create at dataset creation time.
* C-$ identifies permission sets to grant locally at dataset creation
* time.
* s-$@<name> permissions defined in specified set @<name>
* S-$@<name> Sets defined in named set @<name>
*
* Each of the above entities points to another zap attribute that contains one
* attribute for each allowed permission, such as create, destroy,...
* All of the "upper" case class types will specify permission set names
* rather than permissions.
*
* Basically it looks something like this:
* ul$12 -> ZAP OBJ -> permissions...
*
* The ZAP OBJ is referred to as the jump object.
*/
#include <sys/dmu.h>
#include <sys/dmu_objset.h>
#include <sys/dmu_tx.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_prop.h>
#include <sys/dsl_synctask.h>
#include <sys/dsl_deleg.h>
#include <sys/spa.h>
#include <sys/spa_impl.h>
#include <sys/zio_checksum.h> /* for the default checksum value */
#include <sys/zap.h>
#include <sys/fs/zfs.h>
#include <sys/cred.h>
#include <sys/sunddi.h>
#include "zfs_deleg.h"
/*
* Validate that user is allowed to delegate specified permissions.
*
* In order to delegate "create" you must have "create"
* and "allow".
*/
int
dsl_deleg_can_allow(char *ddname, nvlist_t *nvp, cred_t *cr)
{
nvpair_t *whopair = NULL;
int error;
if ((error = dsl_deleg_access(ddname, ZFS_DELEG_PERM_ALLOW, cr)) != 0)
return (error);
while ((whopair = nvlist_next_nvpair(nvp, whopair))) {
nvlist_t *perms;
nvpair_t *permpair = NULL;
VERIFY(nvpair_value_nvlist(whopair, &perms) == 0);
while ((permpair = nvlist_next_nvpair(perms, permpair))) {
const char *perm = nvpair_name(permpair);
if (strcmp(perm, ZFS_DELEG_PERM_ALLOW) == 0)
return (EPERM);
if ((error = dsl_deleg_access(ddname, perm, cr)) != 0)
return (error);
}
}
return (0);
}
/*
* Validate that user is allowed to unallow specified permissions. They
* must have the 'allow' permission, and even then can only unallow
* perms for their uid.
*/
int
dsl_deleg_can_unallow(char *ddname, nvlist_t *nvp, cred_t *cr)
{
nvpair_t *whopair = NULL;
int error;
char idstr[32];
if ((error = dsl_deleg_access(ddname, ZFS_DELEG_PERM_ALLOW, cr)) != 0)
return (error);
(void) snprintf(idstr, sizeof (idstr), "%lld",
(longlong_t)crgetuid(cr));
while ((whopair = nvlist_next_nvpair(nvp, whopair))) {
zfs_deleg_who_type_t type = nvpair_name(whopair)[0];
if (type != ZFS_DELEG_USER &&
type != ZFS_DELEG_USER_SETS)
return (EPERM);
if (strcmp(idstr, &nvpair_name(whopair)[3]) != 0)
return (EPERM);
}
return (0);
}
static void
dsl_deleg_set_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
{
dsl_dir_t *dd = arg1;
nvlist_t *nvp = arg2;
objset_t *mos = dd->dd_pool->dp_meta_objset;
nvpair_t *whopair = NULL;
uint64_t zapobj = dd->dd_phys->dd_deleg_zapobj;
if (zapobj == 0) {
dmu_buf_will_dirty(dd->dd_dbuf, tx);
zapobj = dd->dd_phys->dd_deleg_zapobj = zap_create(mos,
DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
}
while ((whopair = nvlist_next_nvpair(nvp, whopair))) {
const char *whokey = nvpair_name(whopair);
nvlist_t *perms;
nvpair_t *permpair = NULL;
uint64_t jumpobj;
VERIFY(nvpair_value_nvlist(whopair, &perms) == 0);
if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) != 0) {
jumpobj = zap_create(mos, DMU_OT_DSL_PERMS,
DMU_OT_NONE, 0, tx);
VERIFY(zap_update(mos, zapobj,
whokey, 8, 1, &jumpobj, tx) == 0);
}
while ((permpair = nvlist_next_nvpair(perms, permpair))) {
const char *perm = nvpair_name(permpair);
uint64_t n = 0;
VERIFY(zap_update(mos, jumpobj,
perm, 8, 1, &n, tx) == 0);
spa_history_internal_log(LOG_DS_PERM_UPDATE,
dd->dd_pool->dp_spa, tx, cr,
"%s %s dataset = %llu", whokey, perm,
dd->dd_phys->dd_head_dataset_obj);
}
}
}
static void
dsl_deleg_unset_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
{
dsl_dir_t *dd = arg1;
nvlist_t *nvp = arg2;
objset_t *mos = dd->dd_pool->dp_meta_objset;
nvpair_t *whopair = NULL;
uint64_t zapobj = dd->dd_phys->dd_deleg_zapobj;
if (zapobj == 0)
return;
while ((whopair = nvlist_next_nvpair(nvp, whopair))) {
const char *whokey = nvpair_name(whopair);
nvlist_t *perms;
nvpair_t *permpair = NULL;
uint64_t jumpobj;
if (nvpair_value_nvlist(whopair, &perms) != 0) {
if (zap_lookup(mos, zapobj, whokey, 8,
1, &jumpobj) == 0) {
(void) zap_remove(mos, zapobj, whokey, tx);
VERIFY(0 == zap_destroy(mos, jumpobj, tx));
}
spa_history_internal_log(LOG_DS_PERM_WHO_REMOVE,
dd->dd_pool->dp_spa, tx, cr,
"%s dataset = %llu", whokey,
dd->dd_phys->dd_head_dataset_obj);
continue;
}
if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) != 0)
continue;
while ((permpair = nvlist_next_nvpair(perms, permpair))) {
const char *perm = nvpair_name(permpair);
uint64_t n = 0;
(void) zap_remove(mos, jumpobj, perm, tx);
if (zap_count(mos, jumpobj, &n) == 0 && n == 0) {
(void) zap_remove(mos, zapobj,
whokey, tx);
VERIFY(0 == zap_destroy(mos,
jumpobj, tx));
}
spa_history_internal_log(LOG_DS_PERM_REMOVE,
dd->dd_pool->dp_spa, tx, cr,
"%s %s dataset = %llu", whokey, perm,
dd->dd_phys->dd_head_dataset_obj);
}
}
}
int
dsl_deleg_set(const char *ddname, nvlist_t *nvp, boolean_t unset)
{
dsl_dir_t *dd;
int error;
nvpair_t *whopair = NULL;
int blocks_modified = 0;
error = dsl_dir_open(ddname, FTAG, &dd, NULL);
if (error)
return (error);
if (spa_version(dmu_objset_spa(dd->dd_pool->dp_meta_objset)) <
SPA_VERSION_DELEGATED_PERMS) {
dsl_dir_close(dd, FTAG);
return (ENOTSUP);
}
while ((whopair = nvlist_next_nvpair(nvp, whopair)))
blocks_modified++;
error = dsl_sync_task_do(dd->dd_pool, NULL,
unset ? dsl_deleg_unset_sync : dsl_deleg_set_sync,
dd, nvp, blocks_modified);
dsl_dir_close(dd, FTAG);
return (error);
}
/*
* Find all 'allow' permissions from a given point and then continue
* traversing up to the root.
*
* This function constructs an nvlist of nvlists.
* each setpoint is an nvlist composed of an nvlist of an nvlist
* of the individual * users/groups/everyone/create
* permissions.
*
* The nvlist will look like this.
*
* { source fsname -> { whokeys { permissions,...}, ...}}
*
* The fsname nvpairs will be arranged in a bottom up order. For example,
* if we have the following structure a/b/c then the nvpairs for the fsnames
* will be ordered a/b/c, a/b, a.
*/
int
dsl_deleg_get(const char *ddname, nvlist_t **nvp)
{
dsl_dir_t *dd, *startdd;
dsl_pool_t *dp;
int error;
objset_t *mos;
error = dsl_dir_open(ddname, FTAG, &startdd, NULL);
if (error)
return (error);
dp = startdd->dd_pool;
mos = dp->dp_meta_objset;
VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
rw_enter(&dp->dp_config_rwlock, RW_READER);
for (dd = startdd; dd != NULL; dd = dd->dd_parent) {
zap_cursor_t basezc;
zap_attribute_t baseza;
nvlist_t *sp_nvp;
uint64_t n;
char source[MAXNAMELEN];
if (dd->dd_phys->dd_deleg_zapobj &&
(zap_count(mos, dd->dd_phys->dd_deleg_zapobj,
&n) == 0) && n) {
VERIFY(nvlist_alloc(&sp_nvp,
NV_UNIQUE_NAME, KM_SLEEP) == 0);
} else {
continue;
}
for (zap_cursor_init(&basezc, mos,
dd->dd_phys->dd_deleg_zapobj);
zap_cursor_retrieve(&basezc, &baseza) == 0;
zap_cursor_advance(&basezc)) {
zap_cursor_t zc;
zap_attribute_t za;
nvlist_t *perms_nvp;
ASSERT(baseza.za_integer_length == 8);
ASSERT(baseza.za_num_integers == 1);
VERIFY(nvlist_alloc(&perms_nvp,
NV_UNIQUE_NAME, KM_SLEEP) == 0);
for (zap_cursor_init(&zc, mos, baseza.za_first_integer);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
VERIFY(nvlist_add_boolean(perms_nvp,
za.za_name) == 0);
}
zap_cursor_fini(&zc);
VERIFY(nvlist_add_nvlist(sp_nvp, baseza.za_name,
perms_nvp) == 0);
nvlist_free(perms_nvp);
}
zap_cursor_fini(&basezc);
dsl_dir_name(dd, source);
VERIFY(nvlist_add_nvlist(*nvp, source, sp_nvp) == 0);
nvlist_free(sp_nvp);
}
rw_exit(&dp->dp_config_rwlock);
dsl_dir_close(startdd, FTAG);
return (0);
}
/*
* Routines for dsl_deleg_access() -- access checking.
*/
typedef struct perm_set {
avl_node_t p_node;
boolean_t p_matched;
char p_setname[ZFS_MAX_DELEG_NAME];
} perm_set_t;
static int
perm_set_compare(const void *arg1, const void *arg2)
{
const perm_set_t *node1 = arg1;
const perm_set_t *node2 = arg2;
int val;
val = strcmp(node1->p_setname, node2->p_setname);
if (val == 0)
return (0);
return (val > 0 ? 1 : -1);
}
/*
* Determine whether a specified permission exists.
*
* First the base attribute has to be retrieved. i.e. ul$12
* Once the base object has been retrieved the actual permission
* is lookup up in the zap object the base object points to.
*
* Return 0 if permission exists, ENOENT if there is no whokey, EPERM if
* there is no perm in that jumpobj.
*/
static int
dsl_check_access(objset_t *mos, uint64_t zapobj,
char type, char checkflag, void *valp, const char *perm)
{
int error;
uint64_t jumpobj, zero;
char whokey[ZFS_MAX_DELEG_NAME];
zfs_deleg_whokey(whokey, type, checkflag, valp);
error = zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj);
if (error == 0) {
error = zap_lookup(mos, jumpobj, perm, 8, 1, &zero);
if (error == ENOENT)
error = EPERM;
}
return (error);
}
/*
* check a specified user/group for a requested permission
*/
static int
dsl_check_user_access(objset_t *mos, uint64_t zapobj, const char *perm,
int checkflag, cred_t *cr)
{
const gid_t *gids;
int ngids;
int i;
uint64_t id;
/* check for user */
id = crgetuid(cr);
if (dsl_check_access(mos, zapobj,
ZFS_DELEG_USER, checkflag, &id, perm) == 0)
return (0);
/* check for users primary group */
id = crgetgid(cr);
if (dsl_check_access(mos, zapobj,
ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
return (0);
/* check for everyone entry */
id = -1;
if (dsl_check_access(mos, zapobj,
ZFS_DELEG_EVERYONE, checkflag, &id, perm) == 0)
return (0);
/* check each supplemental group user is a member of */
ngids = crgetngroups(cr);
gids = crgetgroups(cr);
for (i = 0; i != ngids; i++) {
id = gids[i];
if (dsl_check_access(mos, zapobj,
ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
return (0);
}
return (EPERM);
}
/*
* Iterate over the sets specified in the specified zapobj
* and load them into the permsets avl tree.
*/
static int
dsl_load_sets(objset_t *mos, uint64_t zapobj,
char type, char checkflag, void *valp, avl_tree_t *avl)
{
zap_cursor_t zc;
zap_attribute_t za;
perm_set_t *permnode;
avl_index_t idx;
uint64_t jumpobj;
int error;
char whokey[ZFS_MAX_DELEG_NAME];
zfs_deleg_whokey(whokey, type, checkflag, valp);
error = zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj);
if (error != 0)
return (error);
for (zap_cursor_init(&zc, mos, jumpobj);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
permnode = kmem_alloc(sizeof (perm_set_t), KM_SLEEP);
(void) strlcpy(permnode->p_setname, za.za_name,
sizeof (permnode->p_setname));
permnode->p_matched = B_FALSE;
if (avl_find(avl, permnode, &idx) == NULL) {
avl_insert(avl, permnode, idx);
} else {
kmem_free(permnode, sizeof (perm_set_t));
}
}
zap_cursor_fini(&zc);
return (0);
}
/*
* Load all permissions user based on cred belongs to.
*/
static void
dsl_load_user_sets(objset_t *mos, uint64_t zapobj, avl_tree_t *avl,
char checkflag, cred_t *cr)
{
const gid_t *gids;
int ngids, i;
uint64_t id;
id = crgetuid(cr);
(void) dsl_load_sets(mos, zapobj,
ZFS_DELEG_USER_SETS, checkflag, &id, avl);
id = crgetgid(cr);
(void) dsl_load_sets(mos, zapobj,
ZFS_DELEG_GROUP_SETS, checkflag, &id, avl);
(void) dsl_load_sets(mos, zapobj,
ZFS_DELEG_EVERYONE_SETS, checkflag, NULL, avl);
ngids = crgetngroups(cr);
gids = crgetgroups(cr);
for (i = 0; i != ngids; i++) {
id = gids[i];
(void) dsl_load_sets(mos, zapobj,
ZFS_DELEG_GROUP_SETS, checkflag, &id, avl);
}
}
/*
* Check if user has requested permission.
*/
int
dsl_deleg_access(const char *dsname, const char *perm, cred_t *cr)
{
dsl_dataset_t *ds;
dsl_dir_t *dd;
dsl_pool_t *dp;
void *cookie;
int error;
char checkflag = ZFS_DELEG_LOCAL;
objset_t *mos;
avl_tree_t permsets;
perm_set_t *setnode;
error = dsl_dataset_hold(dsname, FTAG, &ds);
if (error)
return (error);
dp = ds->ds_dir->dd_pool;
mos = dp->dp_meta_objset;
if (dsl_delegation_on(mos) == B_FALSE) {
dsl_dataset_rele(ds, FTAG);
return (ECANCELED);
}
if (spa_version(dmu_objset_spa(dp->dp_meta_objset)) <
SPA_VERSION_DELEGATED_PERMS) {
dsl_dataset_rele(ds, FTAG);
return (EPERM);
}
avl_create(&permsets, perm_set_compare, sizeof (perm_set_t),
offsetof(perm_set_t, p_node));
rw_enter(&dp->dp_config_rwlock, RW_READER);
for (dd = ds->ds_dir; dd != NULL; dd = dd->dd_parent,
checkflag = ZFS_DELEG_DESCENDENT) {
uint64_t zapobj;
boolean_t expanded;
/*
* If not in global zone then make sure
* the zoned property is set
*/
if (!INGLOBALZONE(curproc)) {
uint64_t zoned;
if (dsl_prop_get_dd(dd,
zfs_prop_to_name(ZFS_PROP_ZONED),
8, 1, &zoned, NULL) != 0)
break;
if (!zoned)
break;
}
zapobj = dd->dd_phys->dd_deleg_zapobj;
if (zapobj == 0)
continue;
dsl_load_user_sets(mos, zapobj, &permsets, checkflag, cr);
again:
expanded = B_FALSE;
for (setnode = avl_first(&permsets); setnode;
setnode = AVL_NEXT(&permsets, setnode)) {
if (setnode->p_matched == B_TRUE)
continue;
/* See if this set directly grants this permission */
error = dsl_check_access(mos, zapobj,
ZFS_DELEG_NAMED_SET, 0, setnode->p_setname, perm);
if (error == 0)
goto success;
if (error == EPERM)
setnode->p_matched = B_TRUE;
/* See if this set includes other sets */
error = dsl_load_sets(mos, zapobj,
ZFS_DELEG_NAMED_SET_SETS, 0,
setnode->p_setname, &permsets);
if (error == 0)
setnode->p_matched = expanded = B_TRUE;
}
/*
* If we expanded any sets, that will define more sets,
* which we need to check.
*/
if (expanded)
goto again;
error = dsl_check_user_access(mos, zapobj, perm, checkflag, cr);
if (error == 0)
goto success;
}
error = EPERM;
success:
rw_exit(&dp->dp_config_rwlock);
dsl_dataset_rele(ds, FTAG);
cookie = NULL;
while ((setnode = avl_destroy_nodes(&permsets, &cookie)) != NULL)
kmem_free(setnode, sizeof (perm_set_t));
return (error);
}
/*
* Other routines.
*/
static void
copy_create_perms(dsl_dir_t *dd, uint64_t pzapobj,
boolean_t dosets, uint64_t uid, dmu_tx_t *tx)
{
objset_t *mos = dd->dd_pool->dp_meta_objset;
uint64_t jumpobj, pjumpobj;
uint64_t zapobj = dd->dd_phys->dd_deleg_zapobj;
zap_cursor_t zc;
zap_attribute_t za;
char whokey[ZFS_MAX_DELEG_NAME];
zfs_deleg_whokey(whokey,
dosets ? ZFS_DELEG_CREATE_SETS : ZFS_DELEG_CREATE,
ZFS_DELEG_LOCAL, NULL);
if (zap_lookup(mos, pzapobj, whokey, 8, 1, &pjumpobj) != 0)
return;
if (zapobj == 0) {
dmu_buf_will_dirty(dd->dd_dbuf, tx);
zapobj = dd->dd_phys->dd_deleg_zapobj = zap_create(mos,
DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
}
zfs_deleg_whokey(whokey,
dosets ? ZFS_DELEG_USER_SETS : ZFS_DELEG_USER,
ZFS_DELEG_LOCAL, &uid);
if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) == ENOENT) {
jumpobj = zap_create(mos, DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
VERIFY(zap_add(mos, zapobj, whokey, 8, 1, &jumpobj, tx) == 0);
}
for (zap_cursor_init(&zc, mos, pjumpobj);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
uint64_t zero = 0;
ASSERT(za.za_integer_length == 8 && za.za_num_integers == 1);
VERIFY(zap_update(mos, jumpobj, za.za_name,
8, 1, &zero, tx) == 0);
}
zap_cursor_fini(&zc);
}
/*
* set all create time permission on new dataset.
*/
void
dsl_deleg_set_create_perms(dsl_dir_t *sdd, dmu_tx_t *tx, cred_t *cr)
{
dsl_dir_t *dd;
uint64_t uid = crgetuid(cr);
if (spa_version(dmu_objset_spa(sdd->dd_pool->dp_meta_objset)) <
SPA_VERSION_DELEGATED_PERMS)
return;
for (dd = sdd->dd_parent; dd != NULL; dd = dd->dd_parent) {
uint64_t pzapobj = dd->dd_phys->dd_deleg_zapobj;
if (pzapobj == 0)
continue;
copy_create_perms(sdd, pzapobj, B_FALSE, uid, tx);
copy_create_perms(sdd, pzapobj, B_TRUE, uid, tx);
}
}
int
dsl_deleg_destroy(objset_t *mos, uint64_t zapobj, dmu_tx_t *tx)
{
zap_cursor_t zc;
zap_attribute_t za;
if (zapobj == 0)
return (0);
for (zap_cursor_init(&zc, mos, zapobj);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
ASSERT(za.za_integer_length == 8 && za.za_num_integers == 1);
VERIFY(0 == zap_destroy(mos, za.za_first_integer, tx));
}
zap_cursor_fini(&zc);
VERIFY(0 == zap_destroy(mos, zapobj, tx));
return (0);
}
boolean_t
dsl_delegation_on(objset_t *os)
{
return (os->os->os_spa->spa_delegation);
}
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