6344681 chmod file_inherit should not added the specified ACE to new create subdirectores.
6346223 chmod A=<acl_specification> not replacing entire ACL
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/sysmacros.h>
#include <sys/resource.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/kmem.h>
#include <sys/cmn_err.h>
#include <sys/errno.h>
#include <sys/unistd.h>
#include <sys/fs/zfs.h>
#include <sys/mode.h>
#include <sys/policy.h>
#include <sys/zfs_znode.h>
#include <sys/zfs_acl.h>
#include <sys/zfs_dir.h>
#include <sys/zfs_vfsops.h>
#include <sys/dmu.h>
#include <sys/zap.h>
#include <util/qsort.h>
#include "fs/fs_subr.h"
#include <acl/acl_common.h>
#define ALLOW ACE_ACCESS_ALLOWED_ACE_TYPE
#define DENY ACE_ACCESS_DENIED_ACE_TYPE
#define OWNING_GROUP (ACE_GROUP|ACE_IDENTIFIER_GROUP)
#define EVERYONE_ALLOW_MASK (ACE_READ_ACL|ACE_READ_ATTRIBUTES | \
ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE)
#define EVERYONE_DENY_MASK (ACE_WRITE_ACL|ACE_WRITE_OWNER | \
ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS)
#define OWNER_ALLOW_MASK (ACE_WRITE_ACL | ACE_WRITE_OWNER | \
ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS)
#define WRITE_MASK (ACE_WRITE_DATA|ACE_APPEND_DATA|ACE_WRITE_NAMED_ATTRS| \
ACE_WRITE_ATTRIBUTES|ACE_WRITE_ACL|ACE_WRITE_OWNER)
#define OGE_CLEAR (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \
ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE)
#define OKAY_MASK_BITS (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \
ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE)
#define ALL_INHERIT (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE | \
ACE_NO_PROPAGATE_INHERIT_ACE|ACE_INHERIT_ONLY_ACE)
#define SECURE_NO_INHERIT (ACE_WRITE_ACL|ACE_WRITE_OWNER)
#define OGE_PAD 6 /* traditional owner/group/everyone ACES */
static int zfs_ace_can_use(znode_t *zp, ace_t *);
static zfs_acl_t *
zfs_acl_alloc(int slots)
{
zfs_acl_t *aclp;
aclp = kmem_zalloc(sizeof (zfs_acl_t), KM_SLEEP);
if (slots != 0) {
aclp->z_acl = kmem_alloc(ZFS_ACL_SIZE(slots), KM_SLEEP);
aclp->z_acl_count = 0;
aclp->z_state = ACL_DATA_ALLOCED;
} else {
aclp->z_state = 0;
}
aclp->z_slots = slots;
return (aclp);
}
void
zfs_acl_free(zfs_acl_t *aclp)
{
if (aclp->z_state == ACL_DATA_ALLOCED) {
kmem_free(aclp->z_acl, ZFS_ACL_SIZE(aclp->z_slots));
}
kmem_free(aclp, sizeof (zfs_acl_t));
}
static uint32_t
zfs_v4_to_unix(uint32_t access_mask)
{
uint32_t new_mask = 0;
if (access_mask & (ACE_READ_DATA | ACE_LIST_DIRECTORY))
new_mask |= S_IROTH;
if (access_mask & (ACE_WRITE_DATA|ACE_APPEND_DATA|ACE_ADD_FILE))
new_mask |= S_IWOTH;
if (access_mask & (ACE_EXECUTE|ACE_READ_NAMED_ATTRS))
new_mask |= S_IXOTH;
return (new_mask);
}
/*
* Convert unix access mask to v4 access mask
*/
static uint32_t
zfs_unix_to_v4(uint32_t access_mask)
{
uint32_t new_mask = 0;
if (access_mask & 01)
new_mask |= (ACE_EXECUTE);
if (access_mask & 02) {
new_mask |= (ACE_WRITE_DATA);
} if (access_mask & 04) {
new_mask |= ACE_READ_DATA;
}
return (new_mask);
}
static void
zfs_set_ace(ace_t *zacep, uint32_t access_mask, int access_type,
uid_t uid, int entry_type)
{
zacep->a_access_mask = access_mask;
zacep->a_type = access_type;
zacep->a_who = uid;
zacep->a_flags = entry_type;
}
static uint64_t
zfs_mode_compute(znode_t *zp, zfs_acl_t *aclp)
{
int i;
int entry_type;
mode_t mode = (zp->z_phys->zp_mode &
(S_IFMT | S_ISUID | S_ISGID | S_ISVTX));
mode_t seen = 0;
ace_t *acep;
for (i = 0, acep = aclp->z_acl;
i != aclp->z_acl_count; i++, acep++) {
entry_type = (acep->a_flags & 0xf040);
if (entry_type == ACE_OWNER) {
if ((acep->a_access_mask & ACE_READ_DATA) &&
(!(seen & S_IRUSR))) {
seen |= S_IRUSR;
if (acep->a_type == ALLOW) {
mode |= S_IRUSR;
}
}
if ((acep->a_access_mask & ACE_WRITE_DATA) &&
(!(seen & S_IWUSR))) {
seen |= S_IWUSR;
if (acep->a_type == ALLOW) {
mode |= S_IWUSR;
}
}
if ((acep->a_access_mask & ACE_EXECUTE) &&
(!(seen & S_IXUSR))) {
seen |= S_IXUSR;
if (acep->a_type == ALLOW) {
mode |= S_IXUSR;
}
}
} else if (entry_type == OWNING_GROUP) {
if ((acep->a_access_mask & ACE_READ_DATA) &&
(!(seen & S_IRGRP))) {
seen |= S_IRGRP;
if (acep->a_type == ALLOW) {
mode |= S_IRGRP;
}
}
if ((acep->a_access_mask & ACE_WRITE_DATA) &&
(!(seen & S_IWGRP))) {
seen |= S_IWGRP;
if (acep->a_type == ALLOW) {
mode |= S_IWGRP;
}
}
if ((acep->a_access_mask & ACE_EXECUTE) &&
(!(seen & S_IXGRP))) {
seen |= S_IXGRP;
if (acep->a_type == ALLOW) {
mode |= S_IXGRP;
}
}
} else if (entry_type == ACE_EVERYONE) {
if ((acep->a_access_mask & ACE_READ_DATA)) {
if (!(seen & S_IRUSR)) {
seen |= S_IRUSR;
if (acep->a_type == ALLOW) {
mode |= S_IRUSR;
}
}
if (!(seen & S_IRGRP)) {
seen |= S_IRGRP;
if (acep->a_type == ALLOW) {
mode |= S_IRGRP;
}
}
if (!(seen & S_IROTH)) {
seen |= S_IROTH;
if (acep->a_type == ALLOW) {
mode |= S_IROTH;
}
}
}
if ((acep->a_access_mask & ACE_WRITE_DATA)) {
if (!(seen & S_IWUSR)) {
seen |= S_IWUSR;
if (acep->a_type == ALLOW) {
mode |= S_IWUSR;
}
}
if (!(seen & S_IWGRP)) {
seen |= S_IWGRP;
if (acep->a_type == ALLOW) {
mode |= S_IWGRP;
}
}
if (!(seen & S_IWOTH)) {
seen |= S_IWOTH;
if (acep->a_type == ALLOW) {
mode |= S_IWOTH;
}
}
}
if ((acep->a_access_mask & ACE_EXECUTE)) {
if (!(seen & S_IXUSR)) {
seen |= S_IXUSR;
if (acep->a_type == ALLOW) {
mode |= S_IXUSR;
}
}
if (!(seen & S_IXGRP)) {
seen |= S_IXGRP;
if (acep->a_type == ALLOW) {
mode |= S_IXGRP;
}
}
if (!(seen & S_IXOTH)) {
seen |= S_IXOTH;
if (acep->a_type == ALLOW) {
mode |= S_IXOTH;
}
}
}
}
}
return (mode);
}
static zfs_acl_t *
zfs_acl_node_read_internal(znode_t *zp)
{
zfs_acl_t *aclp;
aclp = zfs_acl_alloc(0);
aclp->z_acl_count = zp->z_phys->zp_acl.z_acl_count;
aclp->z_acl = &zp->z_phys->zp_acl.z_ace_data[0];
return (aclp);
}
/*
* Read an external acl object.
*/
zfs_acl_t *
zfs_acl_node_read(znode_t *zp)
{
uint64_t extacl = zp->z_phys->zp_acl.z_acl_extern_obj;
zfs_acl_t *aclp;
ASSERT(MUTEX_HELD(&zp->z_acl_lock));
if (zp->z_phys->zp_acl.z_acl_extern_obj == 0)
return (zfs_acl_node_read_internal(zp));
aclp = zfs_acl_alloc(zp->z_phys->zp_acl.z_acl_count);
dmu_read(zp->z_zfsvfs->z_os, extacl, 0,
ZFS_ACL_SIZE(zp->z_phys->zp_acl.z_acl_count), aclp->z_acl);
aclp->z_acl_count = zp->z_phys->zp_acl.z_acl_count;
return (aclp);
}
static boolean_t
zfs_acl_valid(znode_t *zp, ace_t *uace, int aclcnt, int *inherit)
{
ace_t *acep;
int i;
*inherit = 0;
if (aclcnt > MAX_ACL_ENTRIES || aclcnt <= 0) {
return (B_FALSE);
}
for (i = 0, acep = uace; i != aclcnt; i++, acep++) {
/*
* first check type of entry
*/
switch (acep->a_flags & 0xf040) {
case ACE_OWNER:
acep->a_who = -1;
break;
case (ACE_IDENTIFIER_GROUP | ACE_GROUP):
case ACE_IDENTIFIER_GROUP:
if (acep->a_flags & ACE_GROUP) {
acep->a_who = -1;
}
break;
case ACE_EVERYONE:
acep->a_who = -1;
break;
}
/*
* next check inheritance level flags
*/
if (acep->a_type != ALLOW && acep->a_type != DENY)
return (B_FALSE);
/*
* Only directories should have inheritance flags.
*/
if (ZTOV(zp)->v_type != VDIR && (acep->a_flags &
(ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE|
ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE))) {
return (B_FALSE);
}
if (acep->a_flags &
(ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE))
*inherit = 1;
if (acep->a_flags &
(ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE)) {
if ((acep->a_flags & (ACE_FILE_INHERIT_ACE|
ACE_DIRECTORY_INHERIT_ACE)) == 0) {
return (B_FALSE);
}
}
}
return (B_TRUE);
}
/*
* common code for setting acl's.
*
* This function is called from zfs_mode_update, zfs_perm_init, and zfs_setacl.
* zfs_setacl passes a non-NULL inherit pointer (ihp) to indicate that it's
* already checked the acl and knows whether to inherit.
*/
int
zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, dmu_tx_t *tx, int *ihp)
{
int inherit = 0;
int error;
znode_phys_t *zphys = zp->z_phys;
zfs_znode_acl_t *zacl = &zphys->zp_acl;
uint32_t acl_phys_size = ZFS_ACL_SIZE(aclp->z_acl_count);
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
uint64_t aoid = zphys->zp_acl.z_acl_extern_obj;
ASSERT(MUTEX_HELD(&zp->z_lock));
ASSERT(MUTEX_HELD(&zp->z_acl_lock));
if (ihp)
inherit = *ihp; /* already determined by caller */
else if (!zfs_acl_valid(zp, aclp->z_acl,
aclp->z_acl_count, &inherit)) {
return (EINVAL);
}
dmu_buf_will_dirty(zp->z_dbuf, tx);
/*
* Will ACL fit internally?
*/
if (aclp->z_acl_count > ACE_SLOT_CNT) {
if (aoid == 0) {
aoid = dmu_object_alloc(zfsvfs->z_os,
DMU_OT_ACL, acl_phys_size, DMU_OT_NONE, 0, tx);
} else {
(void) dmu_object_set_blocksize(zfsvfs->z_os, aoid,
acl_phys_size, 0, tx);
}
zphys->zp_acl.z_acl_extern_obj = aoid;
zphys->zp_acl.z_acl_count = aclp->z_acl_count;
dmu_write(zfsvfs->z_os, aoid, 0,
acl_phys_size, aclp->z_acl, tx);
} else {
/*
* Migrating back embedded?
*/
if (zphys->zp_acl.z_acl_extern_obj) {
error = dmu_object_free(zfsvfs->z_os,
zp->z_phys->zp_acl.z_acl_extern_obj, tx);
if (error)
return (error);
zphys->zp_acl.z_acl_extern_obj = 0;
}
bcopy(aclp->z_acl, zacl->z_ace_data,
aclp->z_acl_count * sizeof (ace_t));
zacl->z_acl_count = aclp->z_acl_count;
}
if (inherit)
zp->z_phys->zp_flags |= ZFS_INHERIT_ACE;
else
zp->z_phys->zp_flags &= ~ZFS_INHERIT_ACE;
zphys->zp_mode = zfs_mode_compute(zp, aclp);
zfs_time_stamper_locked(zp, STATE_CHANGED, tx);
return (0);
}
/*
* Create space for slots_needed ACEs to be append
* to aclp.
*/
static void
zfs_acl_append(zfs_acl_t *aclp, int slots_needed)
{
ace_t *newacep;
ace_t *oldaclp;
int slot_cnt;
int slots_left = aclp->z_slots - aclp->z_acl_count;
if (aclp->z_state == ACL_DATA_ALLOCED)
ASSERT(aclp->z_slots >= aclp->z_acl_count);
if (slots_left < slots_needed || aclp->z_state != ACL_DATA_ALLOCED) {
slot_cnt = aclp->z_slots + 1 + (slots_needed - slots_left);
newacep = kmem_alloc(ZFS_ACL_SIZE(slot_cnt), KM_SLEEP);
bcopy(aclp->z_acl, newacep,
ZFS_ACL_SIZE(aclp->z_acl_count));
oldaclp = aclp->z_acl;
if (aclp->z_state == ACL_DATA_ALLOCED)
kmem_free(oldaclp, ZFS_ACL_SIZE(aclp->z_slots));
aclp->z_acl = newacep;
aclp->z_slots = slot_cnt;
aclp->z_state = ACL_DATA_ALLOCED;
}
}
/*
* Remove "slot" ACE from aclp
*/
static void
zfs_ace_remove(zfs_acl_t *aclp, int slot)
{
if (aclp->z_acl_count > 1) {
(void) memmove(&aclp->z_acl[slot],
&aclp->z_acl[slot +1], sizeof (ace_t) *
(--aclp->z_acl_count - slot));
} else
aclp->z_acl_count--;
}
/*
* Update access mask for prepended ACE
*
* This applies the "groupmask" value for aclmode property.
*/
static void
zfs_acl_prepend_fixup(ace_t *acep, ace_t *origacep, mode_t mode, uid_t owner)
{
int rmask, wmask, xmask;
int user_ace;
user_ace = (!(acep->a_flags &
(ACE_OWNER|ACE_GROUP|ACE_IDENTIFIER_GROUP)));
if (user_ace && (acep->a_who == owner)) {
rmask = S_IRUSR;
wmask = S_IWUSR;
xmask = S_IXUSR;
} else {
rmask = S_IRGRP;
wmask = S_IWGRP;
xmask = S_IXGRP;
}
if (origacep->a_access_mask & ACE_READ_DATA) {
if (mode & rmask)
acep->a_access_mask &= ~ACE_READ_DATA;
else
acep->a_access_mask |= ACE_READ_DATA;
}
if (origacep->a_access_mask & ACE_WRITE_DATA) {
if (mode & wmask)
acep->a_access_mask &= ~ACE_WRITE_DATA;
else
acep->a_access_mask |= ACE_WRITE_DATA;
}
if (origacep->a_access_mask & ACE_APPEND_DATA) {
if (mode & wmask)
acep->a_access_mask &= ~ACE_APPEND_DATA;
else
acep->a_access_mask |= ACE_APPEND_DATA;
}
if (origacep->a_access_mask & ACE_EXECUTE) {
if (mode & xmask)
acep->a_access_mask &= ~ACE_EXECUTE;
else
acep->a_access_mask |= ACE_EXECUTE;
}
}
/*
* Apply mode to canonical six ACEs.
*/
static void
zfs_acl_fixup_canonical_six(zfs_acl_t *aclp, mode_t mode)
{
int cnt;
ace_t *acep;
cnt = aclp->z_acl_count -1;
acep = aclp->z_acl;
/*
* Fixup final ACEs to match the mode
*/
ASSERT(cnt >= 5);
adjust_ace_pair(&acep[cnt - 1], mode); /* everyone@ */
adjust_ace_pair(&acep[cnt - 3], (mode & 0070) >> 3); /* group@ */
adjust_ace_pair(&acep[cnt - 5], (mode & 0700) >> 6); /* owner@ */
}
static int
zfs_acl_ace_match(ace_t *acep, int allow_deny, int type, int mask)
{
return (acep->a_access_mask == mask && acep->a_type == allow_deny &&
((acep->a_flags & 0xf040) == type));
}
/*
* Can prepended ACE be reused?
*/
static int
zfs_reuse_deny(ace_t *acep, int i)
{
int okay_masks;
if (i < 1)
return (B_FALSE);
if (acep[i-1].a_type != DENY)
return (B_FALSE);
if (acep[i-1].a_flags != (acep[i].a_flags & ACE_IDENTIFIER_GROUP))
return (B_FALSE);
okay_masks = (acep[i].a_access_mask & OKAY_MASK_BITS);
if (acep[i-1].a_access_mask & ~okay_masks)
return (B_FALSE);
return (B_TRUE);
}
/*
* Create space to prepend an ACE
*/
static void
zfs_acl_prepend(zfs_acl_t *aclp, int i)
{
ace_t *oldaclp = NULL;
ace_t *to, *from;
int slots_left = aclp->z_slots - aclp->z_acl_count;
int oldslots;
int need_free = 0;
if (aclp->z_state == ACL_DATA_ALLOCED)
ASSERT(aclp->z_slots >= aclp->z_acl_count);
if (slots_left == 0 || aclp->z_state != ACL_DATA_ALLOCED) {
to = kmem_alloc(ZFS_ACL_SIZE(aclp->z_acl_count +
OGE_PAD), KM_SLEEP);
if (aclp->z_state == ACL_DATA_ALLOCED)
need_free++;
from = aclp->z_acl;
oldaclp = aclp->z_acl;
(void) memmove(to, from,
sizeof (ace_t) * aclp->z_acl_count);
aclp->z_state = ACL_DATA_ALLOCED;
} else {
from = aclp->z_acl;
to = aclp->z_acl;
}
(void) memmove(&to[i + 1], &from[i],
sizeof (ace_t) * (aclp->z_acl_count - i));
if (oldaclp) {
aclp->z_acl = to;
oldslots = aclp->z_slots;
aclp->z_slots = aclp->z_acl_count + OGE_PAD;
if (need_free)
kmem_free(oldaclp, ZFS_ACL_SIZE(oldslots));
}
}
/*
* Prepend deny ACE
*/
static void
zfs_acl_prepend_deny(znode_t *zp, zfs_acl_t *aclp, int i,
mode_t mode)
{
ace_t *acep;
zfs_acl_prepend(aclp, i);
acep = aclp->z_acl;
zfs_set_ace(&acep[i], 0, DENY, acep[i + 1].a_who,
(acep[i + 1].a_flags & 0xf040));
zfs_acl_prepend_fixup(&acep[i], &acep[i+1], mode, zp->z_phys->zp_uid);
aclp->z_acl_count++;
}
/*
* Split an inherited ACE into inherit_only ACE
* and original ACE with inheritance flags stripped off.
*/
static void
zfs_acl_split_ace(zfs_acl_t *aclp, int i)
{
ace_t *acep = aclp->z_acl;
zfs_acl_prepend(aclp, i);
acep = aclp->z_acl;
acep[i] = acep[i + 1];
acep[i].a_flags |= ACE_INHERIT_ONLY_ACE;
acep[i + 1].a_flags &= ~ALL_INHERIT;
aclp->z_acl_count++;
}
/*
* Are ACES started at index i, the canonical six ACES?
*/
static int
zfs_have_canonical_six(zfs_acl_t *aclp, int i)
{
ace_t *acep = aclp->z_acl;
if ((zfs_acl_ace_match(&acep[i],
DENY, ACE_OWNER, 0) &&
zfs_acl_ace_match(&acep[i + 1], ALLOW, ACE_OWNER,
OWNER_ALLOW_MASK) && zfs_acl_ace_match(&acep[i + 2],
DENY, OWNING_GROUP, 0) && zfs_acl_ace_match(&acep[i + 3],
ALLOW, OWNING_GROUP, 0) && zfs_acl_ace_match(&acep[i + 4],
DENY, ACE_EVERYONE, EVERYONE_DENY_MASK) &&
zfs_acl_ace_match(&acep[i + 5], ALLOW, ACE_EVERYONE,
EVERYONE_ALLOW_MASK))) {
return (1);
} else {
return (0);
}
}
/*
* Apply step 1g, to group entries
*
* Need to deal with corner case where group may have
* greater permissions than owner. If so then limit
* group permissions, based on what extra permissions
* group has.
*/
static void
zfs_fixup_group_entries(ace_t *acep, mode_t mode)
{
mode_t extramode = (mode >> 3) & 07;
mode_t ownermode = (mode >> 6);
if (acep[0].a_flags & ACE_IDENTIFIER_GROUP) {
extramode &= ~ownermode;
if (extramode) {
if (extramode & 04) {
acep[0].a_access_mask &= ~ACE_READ_DATA;
acep[1].a_access_mask &= ~ACE_READ_DATA;
}
if (extramode & 02) {
acep[0].a_access_mask &=
~(ACE_WRITE_DATA|ACE_APPEND_DATA);
acep[1].a_access_mask &=
~(ACE_WRITE_DATA|ACE_APPEND_DATA);
}
if (extramode & 01) {
acep[0].a_access_mask &= ~ACE_EXECUTE;
acep[1].a_access_mask &= ~ACE_EXECUTE;
}
}
}
}
/*
* Apply the chmod algorithm as described
* in PSARC/2002/240
*/
static int
zfs_acl_chmod(znode_t *zp, uint64_t mode, zfs_acl_t *aclp,
dmu_tx_t *tx)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
ace_t *acep;
int i;
int error;
int entry_type;
int reuse_deny;
int need_canonical_six = 1;
ASSERT(MUTEX_HELD(&zp->z_acl_lock));
ASSERT(MUTEX_HELD(&zp->z_lock));
i = 0;
while (i < aclp->z_acl_count) {
acep = aclp->z_acl;
entry_type = (acep[i].a_flags & 0xf040);
if ((acep[i].a_type != ALLOW && acep[i].a_type != DENY) ||
(acep[i].a_flags & ACE_INHERIT_ONLY_ACE)) {
i++;
continue;
}
if (zfsvfs->z_acl_mode == DISCARD) {
zfs_ace_remove(aclp, i);
continue;
}
/*
* Need to split ace into two?
*/
if ((acep[i].a_flags & (ACE_FILE_INHERIT_ACE|
ACE_DIRECTORY_INHERIT_ACE)) &&
(!(acep[i].a_flags & ACE_INHERIT_ONLY_ACE))) {
zfs_acl_split_ace(aclp, i);
i++;
continue;
}
if (entry_type == ACE_OWNER || entry_type == ACE_EVERYONE ||
(entry_type == OWNING_GROUP)) {
acep[i].a_access_mask &= ~OGE_CLEAR;
i++;
continue;
} else {
if (acep[i].a_type == ALLOW) {
/*
* Check preceding ACE if any, to see
* if we need to prepend a DENY ACE.
* This is only applicable when the acl_mode
* property == groupmask.
*/
if (zfsvfs->z_acl_mode == GROUPMASK) {
reuse_deny = zfs_reuse_deny(acep, i);
if (reuse_deny == B_FALSE) {
zfs_acl_prepend_deny(zp, aclp,
i, mode);
i++;
acep = aclp->z_acl;
} else {
zfs_acl_prepend_fixup(
&acep[i - 1],
&acep[i], mode,
zp->z_phys->zp_uid);
}
zfs_fixup_group_entries(&acep[i - 1],
mode);
}
}
i++;
}
}
/*
* Check out last six aces, if we have six.
*/
if (aclp->z_acl_count >= 6) {
i = aclp->z_acl_count - 6;
if (zfs_have_canonical_six(aclp, i)) {
need_canonical_six = 0;
}
}
if (need_canonical_six) {
zfs_acl_append(aclp, 6);
i = aclp->z_acl_count;
acep = aclp->z_acl;
zfs_set_ace(&acep[i++], 0, DENY, -1, ACE_OWNER);
zfs_set_ace(&acep[i++], OWNER_ALLOW_MASK, ALLOW, -1, ACE_OWNER);
zfs_set_ace(&acep[i++], 0, DENY, -1, OWNING_GROUP);
zfs_set_ace(&acep[i++], 0, ALLOW, -1, OWNING_GROUP);
zfs_set_ace(&acep[i++], EVERYONE_DENY_MASK,
DENY, -1, ACE_EVERYONE);
zfs_set_ace(&acep[i++], EVERYONE_ALLOW_MASK,
ALLOW, -1, ACE_EVERYONE);
aclp->z_acl_count += 6;
}
zfs_acl_fixup_canonical_six(aclp, mode);
zp->z_phys->zp_mode = mode;
error = zfs_aclset_common(zp, aclp, tx, NULL);
return (error);
}
int
zfs_acl_chmod_setattr(znode_t *zp, uint64_t mode, dmu_tx_t *tx)
{
zfs_acl_t *aclp;
int error;
ASSERT(MUTEX_HELD(&zp->z_lock));
mutex_enter(&zp->z_acl_lock);
aclp = zfs_acl_node_read(zp);
error = zfs_acl_chmod(zp, mode, aclp, tx);
mutex_exit(&zp->z_acl_lock);
zfs_acl_free(aclp);
return (error);
}
/*
* strip off write_owner and write_acl
*/
static void
zfs_securemode_update(zfsvfs_t *zfsvfs, ace_t *acep)
{
if ((zfsvfs->z_acl_inherit == SECURE) &&
acep->a_type == ALLOW)
acep->a_access_mask &= ~SECURE_NO_INHERIT;
}
/*
* inherit inheritable ACEs from parent
*/
static zfs_acl_t *
zfs_acl_inherit(znode_t *zp, zfs_acl_t *paclp)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
ace_t *pacep;
ace_t *acep;
int ace_cnt = 0;
int pace_cnt;
int i, j;
zfs_acl_t *aclp = NULL;
i = j = 0;
pace_cnt = paclp->z_acl_count;
pacep = paclp->z_acl;
if (zfsvfs->z_acl_inherit != DISCARD) {
for (i = 0; i != pace_cnt; i++) {
if (zfsvfs->z_acl_inherit == NOALLOW &&
pacep[i].a_type == ALLOW)
continue;
if (zfs_ace_can_use(zp, &pacep[i])) {
ace_cnt++;
if (!(pacep[i].a_flags &
ACE_NO_PROPAGATE_INHERIT_ACE))
ace_cnt++;
}
}
}
aclp = zfs_acl_alloc(ace_cnt + OGE_PAD);
if (ace_cnt && zfsvfs->z_acl_inherit != DISCARD) {
acep = aclp->z_acl;
pacep = paclp->z_acl;
for (i = 0; i != pace_cnt; i++) {
if (zfsvfs->z_acl_inherit == NOALLOW &&
pacep[i].a_type == ALLOW)
continue;
if (zfs_ace_can_use(zp, &pacep[i])) {
/*
* Now create entry for inherited ace
*/
acep[j] = pacep[i];
if (pacep[i].a_flags &
ACE_NO_PROPAGATE_INHERIT_ACE) {
acep[j].a_flags &= ~ALL_INHERIT;
j++;
continue;
}
if (pacep[i].a_type != ALLOW &&
pacep[i].a_type != DENY) {
zfs_securemode_update(zfsvfs, &acep[j]);
j++;
continue;
}
if (ZTOV(zp)->v_type != VDIR) {
acep[j].a_flags &= ~ALL_INHERIT;
zfs_securemode_update(zfsvfs, &acep[j]);
j++;
continue;
}
ASSERT(ZTOV(zp)->v_type == VDIR);
/*
* If we are inheriting an ACE targeted for
* only files, then make sure inherit_only
* is on for future propagation.
*/
if ((acep[j].a_flags & (ACE_FILE_INHERIT_ACE |
ACE_DIRECTORY_INHERIT_ACE)) ==
ACE_FILE_INHERIT_ACE) {
acep[j].a_flags |= ACE_INHERIT_ONLY_ACE;
} else {
acep[j].a_flags &=
~ACE_INHERIT_ONLY_ACE;
}
zfs_securemode_update(zfsvfs, &acep[j]);
j++;
}
}
}
aclp->z_acl_count = j;
ASSERT(aclp->z_slots >= aclp->z_acl_count);
return (aclp);
}
/*
* Create file system object initial permissions
* including inheritable ACEs.
*/
void
zfs_perm_init(znode_t *zp, znode_t *parent, int flag,
vattr_t *vap, dmu_tx_t *tx, cred_t *cr)
{
uint64_t mode;
uid_t uid;
gid_t gid;
int error;
int pull_down;
zfs_acl_t *aclp, *paclp;
mode = MAKEIMODE(vap->va_type, vap->va_mode);
/*
* Determine uid and gid.
*/
if ((flag & (IS_ROOT_NODE | IS_REPLAY)) ||
((flag & IS_XATTR) && (vap->va_type == VDIR))) {
uid = vap->va_uid;
gid = vap->va_gid;
} else {
uid = crgetuid(cr);
if ((vap->va_mask & AT_GID) &&
((vap->va_gid == parent->z_phys->zp_gid) ||
groupmember(vap->va_gid, cr) ||
secpolicy_vnode_create_gid(cr)))
gid = vap->va_gid;
else
gid = (parent->z_phys->zp_mode & S_ISGID) ?
parent->z_phys->zp_gid : crgetgid(cr);
}
/*
* If we're creating a directory, and the parent directory has the
* set-GID bit set, set in on the new directory.
* Otherwise, if the user is neither privileged nor a member of the
* file's new group, clear the file's set-GID bit.
*/
if ((parent->z_phys->zp_mode & S_ISGID) && (vap->va_type == VDIR))
mode |= S_ISGID;
else {
if ((mode & S_ISGID) &&
secpolicy_vnode_setids_setgids(cr, gid) != 0)
mode &= ~S_ISGID;
}
zp->z_phys->zp_uid = uid;
zp->z_phys->zp_gid = gid;
zp->z_phys->zp_mode = mode;
mutex_enter(&parent->z_lock);
pull_down = (parent->z_phys->zp_flags & ZFS_INHERIT_ACE);
if (pull_down) {
mutex_enter(&parent->z_acl_lock);
paclp = zfs_acl_node_read(parent);
mutex_exit(&parent->z_acl_lock);
aclp = zfs_acl_inherit(zp, paclp);
zfs_acl_free(paclp);
} else {
aclp = zfs_acl_alloc(6);
}
mutex_exit(&parent->z_lock);
mutex_enter(&zp->z_lock);
mutex_enter(&zp->z_acl_lock);
error = zfs_acl_chmod(zp, mode, aclp, tx);
mutex_exit(&zp->z_lock);
mutex_exit(&zp->z_acl_lock);
ASSERT3U(error, ==, 0);
zfs_acl_free(aclp);
}
/*
* Can use be used for inheritance
*/
static int
zfs_ace_can_use(znode_t *zp, ace_t *acep)
{
int vtype = ZTOV(zp)->v_type;
int iflags = (acep->a_flags & 0xf);
if ((vtype == VDIR) && (iflags & ACE_DIRECTORY_INHERIT_ACE))
return (1);
else if (iflags & ACE_FILE_INHERIT_ACE)
return (1);
return (0);
}
/*
* Retrieve a files ACL
*/
int
zfs_getacl(znode_t *zp, vsecattr_t *vsecp, cred_t *cr)
{
zfs_acl_t *aclp;
ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT);
int error;
if (error = zfs_zaccess(zp, ACE_READ_ACL, cr)) {
/*
* If owner of file then allow reading of the
* ACL.
*/
if (crgetuid(cr) != zp->z_phys->zp_uid)
return (error);
}
if (mask == 0)
return (ENOSYS);
mutex_enter(&zp->z_acl_lock);
aclp = zfs_acl_node_read(zp);
if (mask & VSA_ACECNT) {
vsecp->vsa_aclcnt = aclp->z_acl_count;
}
if (mask & VSA_ACE) {
vsecp->vsa_aclentp = kmem_alloc(aclp->z_acl_count *
sizeof (ace_t), KM_SLEEP);
bcopy(aclp->z_acl, vsecp->vsa_aclentp,
aclp->z_acl_count * sizeof (ace_t));
}
mutex_exit(&zp->z_acl_lock);
zfs_acl_free(aclp);
return (0);
}
/*
* Set a files ACL
*/
int
zfs_setacl(znode_t *zp, vsecattr_t *vsecp, cred_t *cr)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
zilog_t *zilog = zfsvfs->z_log;
ace_t *acep = vsecp->vsa_aclentp;
int aclcnt = vsecp->vsa_aclcnt;
ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT);
dmu_tx_t *tx;
int error;
int inherit;
zfs_acl_t *aclp;
uint64_t seq = 0;
if (mask == 0)
return (EINVAL);
if (!zfs_acl_valid(zp, acep, aclcnt, &inherit))
return (EINVAL);
top:
error = zfs_zaccess_v4_perm(zp, ACE_WRITE_ACL, cr);
if (error == EACCES || error == ACCESS_UNDETERMINED) {
if ((error = secpolicy_vnode_setdac(cr,
zp->z_phys->zp_uid)) != 0) {
return (error);
}
} else if (error) {
return (error == EROFS ? error : EPERM);
}
mutex_enter(&zp->z_lock);
mutex_enter(&zp->z_acl_lock);
tx = dmu_tx_create(zfsvfs->z_os);
dmu_tx_hold_bonus(tx, zp->z_id);
if (zp->z_phys->zp_acl.z_acl_extern_obj) {
dmu_tx_hold_write(tx, zp->z_phys->zp_acl.z_acl_extern_obj,
0, ZFS_ACL_SIZE(aclcnt));
} else if (aclcnt > ACE_SLOT_CNT) {
dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, ZFS_ACL_SIZE(aclcnt));
}
error = dmu_tx_assign(tx, zfsvfs->z_assign);
if (error) {
dmu_tx_abort(tx);
mutex_exit(&zp->z_acl_lock);
mutex_exit(&zp->z_lock);
if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) {
txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0);
goto top;
}
return (error);
}
aclp = zfs_acl_alloc(aclcnt);
bcopy(acep, aclp->z_acl, sizeof (ace_t) * aclcnt);
aclp->z_acl_count = aclcnt;
error = zfs_aclset_common(zp, aclp, tx, &inherit);
ASSERT(error == 0);
zfs_acl_free(aclp);
seq = zfs_log_acl(zilog, tx, TX_ACL, zp, aclcnt, acep);
dmu_tx_commit(tx);
done:
mutex_exit(&zp->z_acl_lock);
mutex_exit(&zp->z_lock);
zil_commit(zilog, seq, 0);
return (error);
}
static int
zfs_ace_access(ace_t *zacep, int mode_wanted, int *working_mode)
{
if ((*working_mode & mode_wanted) == mode_wanted) {
return (0);
}
if (zacep->a_access_mask & mode_wanted) {
if (zacep->a_type == ALLOW) {
*working_mode |= (mode_wanted & zacep->a_access_mask);
if ((*working_mode & mode_wanted) == mode_wanted)
return (0);
} else if (zacep->a_type == DENY) {
return (EACCES);
}
}
/*
* haven't been specifcally denied at this point
* so return UNDETERMINED.
*/
return (ACCESS_UNDETERMINED);
}
static int
zfs_zaccess_common(znode_t *zp, int v4_mode, int *working_mode, cred_t *cr)
{
zfs_acl_t *aclp;
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
ace_t *zacep;
gid_t gid;
int mode_wanted = v4_mode;
int cnt;
int i;
int access_deny = ACCESS_UNDETERMINED;
uint_t entry_type;
uid_t uid = crgetuid(cr);
*working_mode = 0;
if (zfsvfs->z_assign >= TXG_INITIAL) /* ZIL replay */
return (0);
if ((v4_mode & WRITE_MASK) &&
(zp->z_zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) &&
(!IS_DEVVP(ZTOV(zp)))) {
return (EROFS);
}
mutex_enter(&zp->z_acl_lock);
aclp = zfs_acl_node_read(zp);
zacep = aclp->z_acl;
cnt = aclp->z_acl_count;
for (i = 0; i != cnt; i++) {
if (zacep[i].a_flags & ACE_INHERIT_ONLY_ACE)
continue;
entry_type = (zacep[i].a_flags & 0xf040);
switch (entry_type) {
case ACE_OWNER:
if (uid == zp->z_phys->zp_uid) {
access_deny = zfs_ace_access(&zacep[i],
mode_wanted, working_mode);
}
break;
case (ACE_IDENTIFIER_GROUP | ACE_GROUP):
case ACE_IDENTIFIER_GROUP:
/*
* Owning group gid is in znode not ACL
*/
if (entry_type == (ACE_IDENTIFIER_GROUP | ACE_GROUP))
gid = zp->z_phys->zp_gid;
else
gid = zacep[i].a_who;
if (groupmember(gid, cr)) {
access_deny = zfs_ace_access(&zacep[i],
mode_wanted, working_mode);
}
break;
case ACE_EVERYONE:
access_deny = zfs_ace_access(&zacep[i],
mode_wanted, working_mode);
break;
/* USER Entry */
default:
if (entry_type == 0) {
if (uid == zacep[i].a_who) {
access_deny = zfs_ace_access(&zacep[i],
mode_wanted, working_mode);
}
break;
}
zfs_acl_free(aclp);
mutex_exit(&zp->z_acl_lock);
return (EIO);
}
if (access_deny != ACCESS_UNDETERMINED)
break;
}
mutex_exit(&zp->z_acl_lock);
zfs_acl_free(aclp);
return (access_deny);
}
/*
* Determine whether Access should be granted/denied, invoking least
* priv subsytem when a deny is determined.
*/
int
zfs_zaccess(znode_t *zp, int mode, cred_t *cr)
{
int working_mode = 0;
int error;
int is_attr;
znode_t *xzp;
znode_t *check_zp = zp;
is_attr = ((zp->z_phys->zp_flags & ZFS_XATTR) &&
(ZTOV(zp)->v_type == VDIR));
/*
* If attribute then validate against base file
*/
if (is_attr) {
if ((error = zfs_zget(zp->z_zfsvfs,
zp->z_phys->zp_parent, &xzp)) != 0) {
return (error);
}
check_zp = xzp;
/*
* fixup mode to map to xattr perms
*/
if (mode & (ACE_WRITE_DATA|ACE_APPEND_DATA)) {
mode &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA);
mode |= ACE_WRITE_NAMED_ATTRS;
}
if (mode & (ACE_READ_DATA|ACE_EXECUTE)) {
mode &= ~(ACE_READ_DATA|ACE_EXECUTE);
mode |= ACE_READ_NAMED_ATTRS;
}
}
error = zfs_zaccess_common(check_zp, mode, &working_mode, cr);
if (error == EROFS) {
if (is_attr)
VN_RELE(ZTOV(xzp));
return (error);
}
if (error || (working_mode != mode)) {
error = secpolicy_vnode_access(cr, ZTOV(check_zp),
check_zp->z_phys->zp_uid, ~zfs_v4_to_unix(working_mode));
}
if (is_attr)
VN_RELE(ZTOV(xzp));
return (error);
}
/*
* Special zaccess function to check for special nfsv4 perm.
* doesn't call secpolicy_vnode_access() for failure, since that
* would probably be the wrong policy function to call.
* instead its up to the caller to handle that situation.
*/
int
zfs_zaccess_v4_perm(znode_t *zp, int mode, cred_t *cr)
{
int working_mode = 0;
return (zfs_zaccess_common(zp, mode, &working_mode, cr));
}
/*
* Translate tradition unix VREAD/VWRITE/VEXEC mode into
* native ACL format and call zfs_zaccess()
*/
int
zfs_zaccess_rwx(znode_t *zp, mode_t mode, cred_t *cr)
{
int v4_mode = zfs_unix_to_v4(mode >> 6);
return (zfs_zaccess(zp, v4_mode, cr));
}
/*
* Determine whether Access should be granted/deny, without
* consulting least priv subsystem.
*
*
* The following chart is the recommended NFSv4 enforcement for
* ability to delete an object.
*
* -------------------------------------------------------
* | Parent Dir | Target Object Permissions |
* | permissions | |
* -------------------------------------------------------
* | | ACL Allows | ACL Denies| Delete |
* | | Delete | Delete | unspecified|
* -------------------------------------------------------
* | ACL Allows | Permit | Permit | Permit |
* | DELETE_CHILD | |
* -------------------------------------------------------
* | ACL Denies | Permit | Deny | Deny |
* | DELETE_CHILD | | | |
* -------------------------------------------------------
* | ACL specifies | | | |
* | only allow | Permit | Permit | Permit |
* | write and | | | |
* | execute | | | |
* -------------------------------------------------------
* | ACL denies | | | |
* | write and | Permit | Deny | Deny |
* | execute | | | |
* -------------------------------------------------------
* ^
* |
* No search privilege, can't even look up file?
*
*/
int
zfs_zaccess_delete(znode_t *dzp, znode_t *zp, cred_t *cr)
{
int dzp_working_mode = 0;
int zp_working_mode = 0;
int dzp_error, zp_error;
/*
* Arghh, this check is going to require a couple of questions
* to be asked. We want specific DELETE permissions to
* take precedence over WRITE/EXECUTE. We don't
* want an ACL such as this to mess us up.
* user:sloar:write_data:deny,user:sloar:delete:allow
*
* However, deny permissions may ultimately be overridden
* by secpolicy_vnode_access().
*/
dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD,
&dzp_working_mode, cr);
zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode, cr);
if (dzp_error == EROFS || zp_error == EROFS)
return (dzp_error);
/*
* First handle the first row
*/
if (dzp_working_mode & ACE_DELETE_CHILD)
return (0);
/*
* Second row
*/
if (zp_working_mode & ACE_DELETE)
return (0);
/*
* Third Row
*/
dzp_error = zfs_zaccess_common(dzp, ACE_WRITE_DATA|ACE_EXECUTE,
&dzp_working_mode, cr);
if (dzp_error == EROFS)
return (dzp_error);
if (dzp_working_mode & (ACE_WRITE_DATA|ACE_EXECUTE))
return (0);
/*
* Fourth Row
*/
if (((dzp_working_mode & (ACE_WRITE_DATA|ACE_EXECUTE)) == 0) &&
(zp_working_mode & ACE_DELETE))
return (0);
return (secpolicy_vnode_access(cr, ZTOV(zp), dzp->z_phys->zp_uid,
S_IWRITE|S_IEXEC));
}
int
zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp,
znode_t *tzp, cred_t *cr)
{
int add_perm;
int error;
add_perm = (ZTOV(szp)->v_type == VDIR) ?
ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE;
/*
* Rename permissions are combination of delete permission +
* add file/subdir permission.
*/
/*
* first make sure we do the delete portion.
*
* If that succeeds then check for add_file/add_subdir permissions
*/
if (error = zfs_zaccess_delete(sdzp, szp, cr))
return (error);
/*
* If we have a tzp, see if we can delete it?
*/
if (tzp) {
if (error = zfs_zaccess_delete(tdzp, tzp, cr))
return (error);
}
/*
* Now check for add permissions
*/
if (error = zfs_zaccess(sdzp, add_perm, cr))
return (error);
error = zfs_sticky_remove_access(sdzp, szp, cr);
return (error);
}