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-rw-r--r--uts/common/fs/zfs/zfs_acl.c2748
1 files changed, 2748 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/zfs_acl.c b/uts/common/fs/zfs/zfs_acl.c
new file mode 100644
index 000000000000..843b5ff06ef4
--- /dev/null
+++ b/uts/common/fs/zfs/zfs_acl.c
@@ -0,0 +1,2748 @@
+/*
+ * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#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/sid.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/sdt.h>
+#include <sys/fs/zfs.h>
+#include <sys/mode.h>
+#include <sys/policy.h>
+#include <sys/zfs_znode.h>
+#include <sys/zfs_fuid.h>
+#include <sys/zfs_acl.h>
+#include <sys/zfs_dir.h>
+#include <sys/zfs_vfsops.h>
+#include <sys/dmu.h>
+#include <sys/dnode.h>
+#include <sys/zap.h>
+#include <sys/sa.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 MAX_ACE_TYPE ACE_SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE
+#define MIN_ACE_TYPE ALLOW
+
+#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 ZFS_CHECKED_MASKS (ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_DATA| \
+ ACE_READ_NAMED_ATTRS|ACE_WRITE_DATA|ACE_WRITE_ATTRIBUTES| \
+ ACE_WRITE_NAMED_ATTRS|ACE_APPEND_DATA|ACE_EXECUTE|ACE_WRITE_OWNER| \
+ ACE_WRITE_ACL|ACE_DELETE|ACE_DELETE_CHILD|ACE_SYNCHRONIZE)
+
+#define WRITE_MASK_DATA (ACE_WRITE_DATA|ACE_APPEND_DATA|ACE_WRITE_NAMED_ATTRS)
+#define WRITE_MASK_ATTRS (ACE_WRITE_ACL|ACE_WRITE_OWNER|ACE_WRITE_ATTRIBUTES| \
+ ACE_DELETE|ACE_DELETE_CHILD)
+#define WRITE_MASK (WRITE_MASK_DATA|WRITE_MASK_ATTRS)
+
+#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|ACE_INHERITED_ACE)
+
+#define RESTRICTED_CLEAR (ACE_WRITE_ACL|ACE_WRITE_OWNER)
+
+#define V4_ACL_WIDE_FLAGS (ZFS_ACL_AUTO_INHERIT|ZFS_ACL_DEFAULTED|\
+ ZFS_ACL_PROTECTED)
+
+#define ZFS_ACL_WIDE_FLAGS (V4_ACL_WIDE_FLAGS|ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|\
+ ZFS_ACL_OBJ_ACE)
+
+#define ALL_MODE_EXECS (S_IXUSR | S_IXGRP | S_IXOTH)
+
+static uint16_t
+zfs_ace_v0_get_type(void *acep)
+{
+ return (((zfs_oldace_t *)acep)->z_type);
+}
+
+static uint16_t
+zfs_ace_v0_get_flags(void *acep)
+{
+ return (((zfs_oldace_t *)acep)->z_flags);
+}
+
+static uint32_t
+zfs_ace_v0_get_mask(void *acep)
+{
+ return (((zfs_oldace_t *)acep)->z_access_mask);
+}
+
+static uint64_t
+zfs_ace_v0_get_who(void *acep)
+{
+ return (((zfs_oldace_t *)acep)->z_fuid);
+}
+
+static void
+zfs_ace_v0_set_type(void *acep, uint16_t type)
+{
+ ((zfs_oldace_t *)acep)->z_type = type;
+}
+
+static void
+zfs_ace_v0_set_flags(void *acep, uint16_t flags)
+{
+ ((zfs_oldace_t *)acep)->z_flags = flags;
+}
+
+static void
+zfs_ace_v0_set_mask(void *acep, uint32_t mask)
+{
+ ((zfs_oldace_t *)acep)->z_access_mask = mask;
+}
+
+static void
+zfs_ace_v0_set_who(void *acep, uint64_t who)
+{
+ ((zfs_oldace_t *)acep)->z_fuid = who;
+}
+
+/*ARGSUSED*/
+static size_t
+zfs_ace_v0_size(void *acep)
+{
+ return (sizeof (zfs_oldace_t));
+}
+
+static size_t
+zfs_ace_v0_abstract_size(void)
+{
+ return (sizeof (zfs_oldace_t));
+}
+
+static int
+zfs_ace_v0_mask_off(void)
+{
+ return (offsetof(zfs_oldace_t, z_access_mask));
+}
+
+/*ARGSUSED*/
+static int
+zfs_ace_v0_data(void *acep, void **datap)
+{
+ *datap = NULL;
+ return (0);
+}
+
+static acl_ops_t zfs_acl_v0_ops = {
+ zfs_ace_v0_get_mask,
+ zfs_ace_v0_set_mask,
+ zfs_ace_v0_get_flags,
+ zfs_ace_v0_set_flags,
+ zfs_ace_v0_get_type,
+ zfs_ace_v0_set_type,
+ zfs_ace_v0_get_who,
+ zfs_ace_v0_set_who,
+ zfs_ace_v0_size,
+ zfs_ace_v0_abstract_size,
+ zfs_ace_v0_mask_off,
+ zfs_ace_v0_data
+};
+
+static uint16_t
+zfs_ace_fuid_get_type(void *acep)
+{
+ return (((zfs_ace_hdr_t *)acep)->z_type);
+}
+
+static uint16_t
+zfs_ace_fuid_get_flags(void *acep)
+{
+ return (((zfs_ace_hdr_t *)acep)->z_flags);
+}
+
+static uint32_t
+zfs_ace_fuid_get_mask(void *acep)
+{
+ return (((zfs_ace_hdr_t *)acep)->z_access_mask);
+}
+
+static uint64_t
+zfs_ace_fuid_get_who(void *args)
+{
+ uint16_t entry_type;
+ zfs_ace_t *acep = args;
+
+ entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS;
+
+ if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP ||
+ entry_type == ACE_EVERYONE)
+ return (-1);
+ return (((zfs_ace_t *)acep)->z_fuid);
+}
+
+static void
+zfs_ace_fuid_set_type(void *acep, uint16_t type)
+{
+ ((zfs_ace_hdr_t *)acep)->z_type = type;
+}
+
+static void
+zfs_ace_fuid_set_flags(void *acep, uint16_t flags)
+{
+ ((zfs_ace_hdr_t *)acep)->z_flags = flags;
+}
+
+static void
+zfs_ace_fuid_set_mask(void *acep, uint32_t mask)
+{
+ ((zfs_ace_hdr_t *)acep)->z_access_mask = mask;
+}
+
+static void
+zfs_ace_fuid_set_who(void *arg, uint64_t who)
+{
+ zfs_ace_t *acep = arg;
+
+ uint16_t entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS;
+
+ if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP ||
+ entry_type == ACE_EVERYONE)
+ return;
+ acep->z_fuid = who;
+}
+
+static size_t
+zfs_ace_fuid_size(void *acep)
+{
+ zfs_ace_hdr_t *zacep = acep;
+ uint16_t entry_type;
+
+ switch (zacep->z_type) {
+ case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
+ case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
+ return (sizeof (zfs_object_ace_t));
+ case ALLOW:
+ case DENY:
+ entry_type =
+ (((zfs_ace_hdr_t *)acep)->z_flags & ACE_TYPE_FLAGS);
+ if (entry_type == ACE_OWNER ||
+ entry_type == OWNING_GROUP ||
+ entry_type == ACE_EVERYONE)
+ return (sizeof (zfs_ace_hdr_t));
+ /*FALLTHROUGH*/
+ default:
+ return (sizeof (zfs_ace_t));
+ }
+}
+
+static size_t
+zfs_ace_fuid_abstract_size(void)
+{
+ return (sizeof (zfs_ace_hdr_t));
+}
+
+static int
+zfs_ace_fuid_mask_off(void)
+{
+ return (offsetof(zfs_ace_hdr_t, z_access_mask));
+}
+
+static int
+zfs_ace_fuid_data(void *acep, void **datap)
+{
+ zfs_ace_t *zacep = acep;
+ zfs_object_ace_t *zobjp;
+
+ switch (zacep->z_hdr.z_type) {
+ case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
+ case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
+ zobjp = acep;
+ *datap = (caddr_t)zobjp + sizeof (zfs_ace_t);
+ return (sizeof (zfs_object_ace_t) - sizeof (zfs_ace_t));
+ default:
+ *datap = NULL;
+ return (0);
+ }
+}
+
+static acl_ops_t zfs_acl_fuid_ops = {
+ zfs_ace_fuid_get_mask,
+ zfs_ace_fuid_set_mask,
+ zfs_ace_fuid_get_flags,
+ zfs_ace_fuid_set_flags,
+ zfs_ace_fuid_get_type,
+ zfs_ace_fuid_set_type,
+ zfs_ace_fuid_get_who,
+ zfs_ace_fuid_set_who,
+ zfs_ace_fuid_size,
+ zfs_ace_fuid_abstract_size,
+ zfs_ace_fuid_mask_off,
+ zfs_ace_fuid_data
+};
+
+/*
+ * The following three functions are provided for compatibility with
+ * older ZPL version in order to determine if the file use to have
+ * an external ACL and what version of ACL previously existed on the
+ * file. Would really be nice to not need this, sigh.
+ */
+uint64_t
+zfs_external_acl(znode_t *zp)
+{
+ zfs_acl_phys_t acl_phys;
+ int error;
+
+ if (zp->z_is_sa)
+ return (0);
+
+ /*
+ * Need to deal with a potential
+ * race where zfs_sa_upgrade could cause
+ * z_isa_sa to change.
+ *
+ * If the lookup fails then the state of z_is_sa should have
+ * changed.
+ */
+
+ if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zp->z_zfsvfs),
+ &acl_phys, sizeof (acl_phys))) == 0)
+ return (acl_phys.z_acl_extern_obj);
+ else {
+ /*
+ * after upgrade the SA_ZPL_ZNODE_ACL should have been
+ * removed
+ */
+ VERIFY(zp->z_is_sa && error == ENOENT);
+ return (0);
+ }
+}
+
+/*
+ * Determine size of ACL in bytes
+ *
+ * This is more complicated than it should be since we have to deal
+ * with old external ACLs.
+ */
+static int
+zfs_acl_znode_info(znode_t *zp, int *aclsize, int *aclcount,
+ zfs_acl_phys_t *aclphys)
+{
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ uint64_t acl_count;
+ int size;
+ int error;
+
+ ASSERT(MUTEX_HELD(&zp->z_acl_lock));
+ if (zp->z_is_sa) {
+ if ((error = sa_size(zp->z_sa_hdl, SA_ZPL_DACL_ACES(zfsvfs),
+ &size)) != 0)
+ return (error);
+ *aclsize = size;
+ if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_COUNT(zfsvfs),
+ &acl_count, sizeof (acl_count))) != 0)
+ return (error);
+ *aclcount = acl_count;
+ } else {
+ if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zfsvfs),
+ aclphys, sizeof (*aclphys))) != 0)
+ return (error);
+
+ if (aclphys->z_acl_version == ZFS_ACL_VERSION_INITIAL) {
+ *aclsize = ZFS_ACL_SIZE(aclphys->z_acl_size);
+ *aclcount = aclphys->z_acl_size;
+ } else {
+ *aclsize = aclphys->z_acl_size;
+ *aclcount = aclphys->z_acl_count;
+ }
+ }
+ return (0);
+}
+
+int
+zfs_znode_acl_version(znode_t *zp)
+{
+ zfs_acl_phys_t acl_phys;
+
+ if (zp->z_is_sa)
+ return (ZFS_ACL_VERSION_FUID);
+ else {
+ int error;
+
+ /*
+ * Need to deal with a potential
+ * race where zfs_sa_upgrade could cause
+ * z_isa_sa to change.
+ *
+ * If the lookup fails then the state of z_is_sa should have
+ * changed.
+ */
+ if ((error = sa_lookup(zp->z_sa_hdl,
+ SA_ZPL_ZNODE_ACL(zp->z_zfsvfs),
+ &acl_phys, sizeof (acl_phys))) == 0)
+ return (acl_phys.z_acl_version);
+ else {
+ /*
+ * After upgrade SA_ZPL_ZNODE_ACL should have
+ * been removed.
+ */
+ VERIFY(zp->z_is_sa && error == ENOENT);
+ return (ZFS_ACL_VERSION_FUID);
+ }
+ }
+}
+
+static int
+zfs_acl_version(int version)
+{
+ if (version < ZPL_VERSION_FUID)
+ return (ZFS_ACL_VERSION_INITIAL);
+ else
+ return (ZFS_ACL_VERSION_FUID);
+}
+
+static int
+zfs_acl_version_zp(znode_t *zp)
+{
+ return (zfs_acl_version(zp->z_zfsvfs->z_version));
+}
+
+zfs_acl_t *
+zfs_acl_alloc(int vers)
+{
+ zfs_acl_t *aclp;
+
+ aclp = kmem_zalloc(sizeof (zfs_acl_t), KM_SLEEP);
+ list_create(&aclp->z_acl, sizeof (zfs_acl_node_t),
+ offsetof(zfs_acl_node_t, z_next));
+ aclp->z_version = vers;
+ if (vers == ZFS_ACL_VERSION_FUID)
+ aclp->z_ops = zfs_acl_fuid_ops;
+ else
+ aclp->z_ops = zfs_acl_v0_ops;
+ return (aclp);
+}
+
+zfs_acl_node_t *
+zfs_acl_node_alloc(size_t bytes)
+{
+ zfs_acl_node_t *aclnode;
+
+ aclnode = kmem_zalloc(sizeof (zfs_acl_node_t), KM_SLEEP);
+ if (bytes) {
+ aclnode->z_acldata = kmem_alloc(bytes, KM_SLEEP);
+ aclnode->z_allocdata = aclnode->z_acldata;
+ aclnode->z_allocsize = bytes;
+ aclnode->z_size = bytes;
+ }
+
+ return (aclnode);
+}
+
+static void
+zfs_acl_node_free(zfs_acl_node_t *aclnode)
+{
+ if (aclnode->z_allocsize)
+ kmem_free(aclnode->z_allocdata, aclnode->z_allocsize);
+ kmem_free(aclnode, sizeof (zfs_acl_node_t));
+}
+
+static void
+zfs_acl_release_nodes(zfs_acl_t *aclp)
+{
+ zfs_acl_node_t *aclnode;
+
+ while (aclnode = list_head(&aclp->z_acl)) {
+ list_remove(&aclp->z_acl, aclnode);
+ zfs_acl_node_free(aclnode);
+ }
+ aclp->z_acl_count = 0;
+ aclp->z_acl_bytes = 0;
+}
+
+void
+zfs_acl_free(zfs_acl_t *aclp)
+{
+ zfs_acl_release_nodes(aclp);
+ list_destroy(&aclp->z_acl);
+ kmem_free(aclp, sizeof (zfs_acl_t));
+}
+
+static boolean_t
+zfs_acl_valid_ace_type(uint_t type, uint_t flags)
+{
+ uint16_t entry_type;
+
+ switch (type) {
+ case ALLOW:
+ case DENY:
+ case ACE_SYSTEM_AUDIT_ACE_TYPE:
+ case ACE_SYSTEM_ALARM_ACE_TYPE:
+ entry_type = flags & ACE_TYPE_FLAGS;
+ return (entry_type == ACE_OWNER ||
+ entry_type == OWNING_GROUP ||
+ entry_type == ACE_EVERYONE || entry_type == 0 ||
+ entry_type == ACE_IDENTIFIER_GROUP);
+ default:
+ if (type >= MIN_ACE_TYPE && type <= MAX_ACE_TYPE)
+ return (B_TRUE);
+ }
+ return (B_FALSE);
+}
+
+static boolean_t
+zfs_ace_valid(vtype_t obj_type, zfs_acl_t *aclp, uint16_t type, uint16_t iflags)
+{
+ /*
+ * first check type of entry
+ */
+
+ if (!zfs_acl_valid_ace_type(type, iflags))
+ return (B_FALSE);
+
+ switch (type) {
+ case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
+ case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
+ if (aclp->z_version < ZFS_ACL_VERSION_FUID)
+ return (B_FALSE);
+ aclp->z_hints |= ZFS_ACL_OBJ_ACE;
+ }
+
+ /*
+ * next check inheritance level flags
+ */
+
+ if (obj_type == VDIR &&
+ (iflags & (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE)))
+ aclp->z_hints |= ZFS_INHERIT_ACE;
+
+ if (iflags & (ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE)) {
+ if ((iflags & (ACE_FILE_INHERIT_ACE|
+ ACE_DIRECTORY_INHERIT_ACE)) == 0) {
+ return (B_FALSE);
+ }
+ }
+
+ return (B_TRUE);
+}
+
+static void *
+zfs_acl_next_ace(zfs_acl_t *aclp, void *start, uint64_t *who,
+ uint32_t *access_mask, uint16_t *iflags, uint16_t *type)
+{
+ zfs_acl_node_t *aclnode;
+
+ ASSERT(aclp);
+
+ if (start == NULL) {
+ aclnode = list_head(&aclp->z_acl);
+ if (aclnode == NULL)
+ return (NULL);
+
+ aclp->z_next_ace = aclnode->z_acldata;
+ aclp->z_curr_node = aclnode;
+ aclnode->z_ace_idx = 0;
+ }
+
+ aclnode = aclp->z_curr_node;
+
+ if (aclnode == NULL)
+ return (NULL);
+
+ if (aclnode->z_ace_idx >= aclnode->z_ace_count) {
+ aclnode = list_next(&aclp->z_acl, aclnode);
+ if (aclnode == NULL)
+ return (NULL);
+ else {
+ aclp->z_curr_node = aclnode;
+ aclnode->z_ace_idx = 0;
+ aclp->z_next_ace = aclnode->z_acldata;
+ }
+ }
+
+ if (aclnode->z_ace_idx < aclnode->z_ace_count) {
+ void *acep = aclp->z_next_ace;
+ size_t ace_size;
+
+ /*
+ * Make sure we don't overstep our bounds
+ */
+ ace_size = aclp->z_ops.ace_size(acep);
+
+ if (((caddr_t)acep + ace_size) >
+ ((caddr_t)aclnode->z_acldata + aclnode->z_size)) {
+ return (NULL);
+ }
+
+ *iflags = aclp->z_ops.ace_flags_get(acep);
+ *type = aclp->z_ops.ace_type_get(acep);
+ *access_mask = aclp->z_ops.ace_mask_get(acep);
+ *who = aclp->z_ops.ace_who_get(acep);
+ aclp->z_next_ace = (caddr_t)aclp->z_next_ace + ace_size;
+ aclnode->z_ace_idx++;
+
+ return ((void *)acep);
+ }
+ return (NULL);
+}
+
+/*ARGSUSED*/
+static uint64_t
+zfs_ace_walk(void *datap, uint64_t cookie, int aclcnt,
+ uint16_t *flags, uint16_t *type, uint32_t *mask)
+{
+ zfs_acl_t *aclp = datap;
+ zfs_ace_hdr_t *acep = (zfs_ace_hdr_t *)(uintptr_t)cookie;
+ uint64_t who;
+
+ acep = zfs_acl_next_ace(aclp, acep, &who, mask,
+ flags, type);
+ return ((uint64_t)(uintptr_t)acep);
+}
+
+static zfs_acl_node_t *
+zfs_acl_curr_node(zfs_acl_t *aclp)
+{
+ ASSERT(aclp->z_curr_node);
+ return (aclp->z_curr_node);
+}
+
+/*
+ * Copy ACE to internal ZFS format.
+ * While processing the ACL each ACE will be validated for correctness.
+ * ACE FUIDs will be created later.
+ */
+int
+zfs_copy_ace_2_fuid(zfsvfs_t *zfsvfs, vtype_t obj_type, zfs_acl_t *aclp,
+ void *datap, zfs_ace_t *z_acl, uint64_t aclcnt, size_t *size,
+ zfs_fuid_info_t **fuidp, cred_t *cr)
+{
+ int i;
+ uint16_t entry_type;
+ zfs_ace_t *aceptr = z_acl;
+ ace_t *acep = datap;
+ zfs_object_ace_t *zobjacep;
+ ace_object_t *aceobjp;
+
+ for (i = 0; i != aclcnt; i++) {
+ aceptr->z_hdr.z_access_mask = acep->a_access_mask;
+ aceptr->z_hdr.z_flags = acep->a_flags;
+ aceptr->z_hdr.z_type = acep->a_type;
+ entry_type = aceptr->z_hdr.z_flags & ACE_TYPE_FLAGS;
+ if (entry_type != ACE_OWNER && entry_type != OWNING_GROUP &&
+ entry_type != ACE_EVERYONE) {
+ aceptr->z_fuid = zfs_fuid_create(zfsvfs, acep->a_who,
+ cr, (entry_type == 0) ?
+ ZFS_ACE_USER : ZFS_ACE_GROUP, fuidp);
+ }
+
+ /*
+ * Make sure ACE is valid
+ */
+ if (zfs_ace_valid(obj_type, aclp, aceptr->z_hdr.z_type,
+ aceptr->z_hdr.z_flags) != B_TRUE)
+ return (EINVAL);
+
+ switch (acep->a_type) {
+ case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
+ case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
+ zobjacep = (zfs_object_ace_t *)aceptr;
+ aceobjp = (ace_object_t *)acep;
+
+ bcopy(aceobjp->a_obj_type, zobjacep->z_object_type,
+ sizeof (aceobjp->a_obj_type));
+ bcopy(aceobjp->a_inherit_obj_type,
+ zobjacep->z_inherit_type,
+ sizeof (aceobjp->a_inherit_obj_type));
+ acep = (ace_t *)((caddr_t)acep + sizeof (ace_object_t));
+ break;
+ default:
+ acep = (ace_t *)((caddr_t)acep + sizeof (ace_t));
+ }
+
+ aceptr = (zfs_ace_t *)((caddr_t)aceptr +
+ aclp->z_ops.ace_size(aceptr));
+ }
+
+ *size = (caddr_t)aceptr - (caddr_t)z_acl;
+
+ return (0);
+}
+
+/*
+ * Copy ZFS ACEs to fixed size ace_t layout
+ */
+static void
+zfs_copy_fuid_2_ace(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, cred_t *cr,
+ void *datap, int filter)
+{
+ uint64_t who;
+ uint32_t access_mask;
+ uint16_t iflags, type;
+ zfs_ace_hdr_t *zacep = NULL;
+ ace_t *acep = datap;
+ ace_object_t *objacep;
+ zfs_object_ace_t *zobjacep;
+ size_t ace_size;
+ uint16_t entry_type;
+
+ while (zacep = zfs_acl_next_ace(aclp, zacep,
+ &who, &access_mask, &iflags, &type)) {
+
+ switch (type) {
+ case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
+ case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
+ if (filter) {
+ continue;
+ }
+ zobjacep = (zfs_object_ace_t *)zacep;
+ objacep = (ace_object_t *)acep;
+ bcopy(zobjacep->z_object_type,
+ objacep->a_obj_type,
+ sizeof (zobjacep->z_object_type));
+ bcopy(zobjacep->z_inherit_type,
+ objacep->a_inherit_obj_type,
+ sizeof (zobjacep->z_inherit_type));
+ ace_size = sizeof (ace_object_t);
+ break;
+ default:
+ ace_size = sizeof (ace_t);
+ break;
+ }
+
+ entry_type = (iflags & ACE_TYPE_FLAGS);
+ if ((entry_type != ACE_OWNER &&
+ entry_type != OWNING_GROUP &&
+ entry_type != ACE_EVERYONE)) {
+ acep->a_who = zfs_fuid_map_id(zfsvfs, who,
+ cr, (entry_type & ACE_IDENTIFIER_GROUP) ?
+ ZFS_ACE_GROUP : ZFS_ACE_USER);
+ } else {
+ acep->a_who = (uid_t)(int64_t)who;
+ }
+ acep->a_access_mask = access_mask;
+ acep->a_flags = iflags;
+ acep->a_type = type;
+ acep = (ace_t *)((caddr_t)acep + ace_size);
+ }
+}
+
+static int
+zfs_copy_ace_2_oldace(vtype_t obj_type, zfs_acl_t *aclp, ace_t *acep,
+ zfs_oldace_t *z_acl, int aclcnt, size_t *size)
+{
+ int i;
+ zfs_oldace_t *aceptr = z_acl;
+
+ for (i = 0; i != aclcnt; i++, aceptr++) {
+ aceptr->z_access_mask = acep[i].a_access_mask;
+ aceptr->z_type = acep[i].a_type;
+ aceptr->z_flags = acep[i].a_flags;
+ aceptr->z_fuid = acep[i].a_who;
+ /*
+ * Make sure ACE is valid
+ */
+ if (zfs_ace_valid(obj_type, aclp, aceptr->z_type,
+ aceptr->z_flags) != B_TRUE)
+ return (EINVAL);
+ }
+ *size = (caddr_t)aceptr - (caddr_t)z_acl;
+ return (0);
+}
+
+/*
+ * convert old ACL format to new
+ */
+void
+zfs_acl_xform(znode_t *zp, zfs_acl_t *aclp, cred_t *cr)
+{
+ zfs_oldace_t *oldaclp;
+ int i;
+ uint16_t type, iflags;
+ uint32_t access_mask;
+ uint64_t who;
+ void *cookie = NULL;
+ zfs_acl_node_t *newaclnode;
+
+ ASSERT(aclp->z_version == ZFS_ACL_VERSION_INITIAL);
+ /*
+ * First create the ACE in a contiguous piece of memory
+ * for zfs_copy_ace_2_fuid().
+ *
+ * We only convert an ACL once, so this won't happen
+ * everytime.
+ */
+ oldaclp = kmem_alloc(sizeof (zfs_oldace_t) * aclp->z_acl_count,
+ KM_SLEEP);
+ i = 0;
+ while (cookie = zfs_acl_next_ace(aclp, cookie, &who,
+ &access_mask, &iflags, &type)) {
+ oldaclp[i].z_flags = iflags;
+ oldaclp[i].z_type = type;
+ oldaclp[i].z_fuid = who;
+ oldaclp[i++].z_access_mask = access_mask;
+ }
+
+ newaclnode = zfs_acl_node_alloc(aclp->z_acl_count *
+ sizeof (zfs_object_ace_t));
+ aclp->z_ops = zfs_acl_fuid_ops;
+ VERIFY(zfs_copy_ace_2_fuid(zp->z_zfsvfs, ZTOV(zp)->v_type, aclp,
+ oldaclp, newaclnode->z_acldata, aclp->z_acl_count,
+ &newaclnode->z_size, NULL, cr) == 0);
+ newaclnode->z_ace_count = aclp->z_acl_count;
+ aclp->z_version = ZFS_ACL_VERSION;
+ kmem_free(oldaclp, aclp->z_acl_count * sizeof (zfs_oldace_t));
+
+ /*
+ * Release all previous ACL nodes
+ */
+
+ zfs_acl_release_nodes(aclp);
+
+ list_insert_head(&aclp->z_acl, newaclnode);
+
+ aclp->z_acl_bytes = newaclnode->z_size;
+ aclp->z_acl_count = newaclnode->z_ace_count;
+
+}
+
+/*
+ * 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 & S_IXOTH)
+ new_mask |= ACE_EXECUTE;
+ if (access_mask & S_IWOTH)
+ new_mask |= ACE_WRITE_DATA;
+ if (access_mask & S_IROTH)
+ new_mask |= ACE_READ_DATA;
+ return (new_mask);
+}
+
+static void
+zfs_set_ace(zfs_acl_t *aclp, void *acep, uint32_t access_mask,
+ uint16_t access_type, uint64_t fuid, uint16_t entry_type)
+{
+ uint16_t type = entry_type & ACE_TYPE_FLAGS;
+
+ aclp->z_ops.ace_mask_set(acep, access_mask);
+ aclp->z_ops.ace_type_set(acep, access_type);
+ aclp->z_ops.ace_flags_set(acep, entry_type);
+ if ((type != ACE_OWNER && type != OWNING_GROUP &&
+ type != ACE_EVERYONE))
+ aclp->z_ops.ace_who_set(acep, fuid);
+}
+
+/*
+ * Determine mode of file based on ACL.
+ * Also, create FUIDs for any User/Group ACEs
+ */
+uint64_t
+zfs_mode_compute(uint64_t fmode, zfs_acl_t *aclp,
+ uint64_t *pflags, uint64_t fuid, uint64_t fgid)
+{
+ int entry_type;
+ mode_t mode;
+ mode_t seen = 0;
+ zfs_ace_hdr_t *acep = NULL;
+ uint64_t who;
+ uint16_t iflags, type;
+ uint32_t access_mask;
+ boolean_t an_exec_denied = B_FALSE;
+
+ mode = (fmode & (S_IFMT | S_ISUID | S_ISGID | S_ISVTX));
+
+ while (acep = zfs_acl_next_ace(aclp, acep, &who,
+ &access_mask, &iflags, &type)) {
+
+ if (!zfs_acl_valid_ace_type(type, iflags))
+ continue;
+
+ entry_type = (iflags & ACE_TYPE_FLAGS);
+
+ /*
+ * Skip over owner@, group@ or everyone@ inherit only ACEs
+ */
+ if ((iflags & ACE_INHERIT_ONLY_ACE) &&
+ (entry_type == ACE_OWNER || entry_type == ACE_EVERYONE ||
+ entry_type == OWNING_GROUP))
+ continue;
+
+ if (entry_type == ACE_OWNER || (entry_type == 0 &&
+ who == fuid)) {
+ if ((access_mask & ACE_READ_DATA) &&
+ (!(seen & S_IRUSR))) {
+ seen |= S_IRUSR;
+ if (type == ALLOW) {
+ mode |= S_IRUSR;
+ }
+ }
+ if ((access_mask & ACE_WRITE_DATA) &&
+ (!(seen & S_IWUSR))) {
+ seen |= S_IWUSR;
+ if (type == ALLOW) {
+ mode |= S_IWUSR;
+ }
+ }
+ if ((access_mask & ACE_EXECUTE) &&
+ (!(seen & S_IXUSR))) {
+ seen |= S_IXUSR;
+ if (type == ALLOW) {
+ mode |= S_IXUSR;
+ }
+ }
+ } else if (entry_type == OWNING_GROUP ||
+ (entry_type == ACE_IDENTIFIER_GROUP && who == fgid)) {
+ if ((access_mask & ACE_READ_DATA) &&
+ (!(seen & S_IRGRP))) {
+ seen |= S_IRGRP;
+ if (type == ALLOW) {
+ mode |= S_IRGRP;
+ }
+ }
+ if ((access_mask & ACE_WRITE_DATA) &&
+ (!(seen & S_IWGRP))) {
+ seen |= S_IWGRP;
+ if (type == ALLOW) {
+ mode |= S_IWGRP;
+ }
+ }
+ if ((access_mask & ACE_EXECUTE) &&
+ (!(seen & S_IXGRP))) {
+ seen |= S_IXGRP;
+ if (type == ALLOW) {
+ mode |= S_IXGRP;
+ }
+ }
+ } else if (entry_type == ACE_EVERYONE) {
+ if ((access_mask & ACE_READ_DATA)) {
+ if (!(seen & S_IRUSR)) {
+ seen |= S_IRUSR;
+ if (type == ALLOW) {
+ mode |= S_IRUSR;
+ }
+ }
+ if (!(seen & S_IRGRP)) {
+ seen |= S_IRGRP;
+ if (type == ALLOW) {
+ mode |= S_IRGRP;
+ }
+ }
+ if (!(seen & S_IROTH)) {
+ seen |= S_IROTH;
+ if (type == ALLOW) {
+ mode |= S_IROTH;
+ }
+ }
+ }
+ if ((access_mask & ACE_WRITE_DATA)) {
+ if (!(seen & S_IWUSR)) {
+ seen |= S_IWUSR;
+ if (type == ALLOW) {
+ mode |= S_IWUSR;
+ }
+ }
+ if (!(seen & S_IWGRP)) {
+ seen |= S_IWGRP;
+ if (type == ALLOW) {
+ mode |= S_IWGRP;
+ }
+ }
+ if (!(seen & S_IWOTH)) {
+ seen |= S_IWOTH;
+ if (type == ALLOW) {
+ mode |= S_IWOTH;
+ }
+ }
+ }
+ if ((access_mask & ACE_EXECUTE)) {
+ if (!(seen & S_IXUSR)) {
+ seen |= S_IXUSR;
+ if (type == ALLOW) {
+ mode |= S_IXUSR;
+ }
+ }
+ if (!(seen & S_IXGRP)) {
+ seen |= S_IXGRP;
+ if (type == ALLOW) {
+ mode |= S_IXGRP;
+ }
+ }
+ if (!(seen & S_IXOTH)) {
+ seen |= S_IXOTH;
+ if (type == ALLOW) {
+ mode |= S_IXOTH;
+ }
+ }
+ }
+ } else {
+ /*
+ * Only care if this IDENTIFIER_GROUP or
+ * USER ACE denies execute access to someone,
+ * mode is not affected
+ */
+ if ((access_mask & ACE_EXECUTE) && type == DENY)
+ an_exec_denied = B_TRUE;
+ }
+ }
+
+ /*
+ * Failure to allow is effectively a deny, so execute permission
+ * is denied if it was never mentioned or if we explicitly
+ * weren't allowed it.
+ */
+ if (!an_exec_denied &&
+ ((seen & ALL_MODE_EXECS) != ALL_MODE_EXECS ||
+ (mode & ALL_MODE_EXECS) != ALL_MODE_EXECS))
+ an_exec_denied = B_TRUE;
+
+ if (an_exec_denied)
+ *pflags &= ~ZFS_NO_EXECS_DENIED;
+ else
+ *pflags |= ZFS_NO_EXECS_DENIED;
+
+ return (mode);
+}
+
+/*
+ * Read an external acl object. If the intent is to modify, always
+ * create a new acl and leave any cached acl in place.
+ */
+static int
+zfs_acl_node_read(znode_t *zp, boolean_t have_lock, zfs_acl_t **aclpp,
+ boolean_t will_modify)
+{
+ zfs_acl_t *aclp;
+ int aclsize;
+ int acl_count;
+ zfs_acl_node_t *aclnode;
+ zfs_acl_phys_t znode_acl;
+ int version;
+ int error;
+ boolean_t drop_lock = B_FALSE;
+
+ ASSERT(MUTEX_HELD(&zp->z_acl_lock));
+
+ if (zp->z_acl_cached && !will_modify) {
+ *aclpp = zp->z_acl_cached;
+ return (0);
+ }
+
+ /*
+ * close race where znode could be upgrade while trying to
+ * read the znode attributes.
+ *
+ * But this could only happen if the file isn't already an SA
+ * znode
+ */
+ if (!zp->z_is_sa && !have_lock) {
+ mutex_enter(&zp->z_lock);
+ drop_lock = B_TRUE;
+ }
+ version = zfs_znode_acl_version(zp);
+
+ if ((error = zfs_acl_znode_info(zp, &aclsize,
+ &acl_count, &znode_acl)) != 0) {
+ goto done;
+ }
+
+ aclp = zfs_acl_alloc(version);
+
+ aclp->z_acl_count = acl_count;
+ aclp->z_acl_bytes = aclsize;
+
+ aclnode = zfs_acl_node_alloc(aclsize);
+ aclnode->z_ace_count = aclp->z_acl_count;
+ aclnode->z_size = aclsize;
+
+ if (!zp->z_is_sa) {
+ if (znode_acl.z_acl_extern_obj) {
+ error = dmu_read(zp->z_zfsvfs->z_os,
+ znode_acl.z_acl_extern_obj, 0, aclnode->z_size,
+ aclnode->z_acldata, DMU_READ_PREFETCH);
+ } else {
+ bcopy(znode_acl.z_ace_data, aclnode->z_acldata,
+ aclnode->z_size);
+ }
+ } else {
+ error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_ACES(zp->z_zfsvfs),
+ aclnode->z_acldata, aclnode->z_size);
+ }
+
+ if (error != 0) {
+ zfs_acl_free(aclp);
+ zfs_acl_node_free(aclnode);
+ /* convert checksum errors into IO errors */
+ if (error == ECKSUM)
+ error = EIO;
+ goto done;
+ }
+
+ list_insert_head(&aclp->z_acl, aclnode);
+
+ *aclpp = aclp;
+ if (!will_modify)
+ zp->z_acl_cached = aclp;
+done:
+ if (drop_lock)
+ mutex_exit(&zp->z_lock);
+ return (error);
+}
+
+/*ARGSUSED*/
+void
+zfs_acl_data_locator(void **dataptr, uint32_t *length, uint32_t buflen,
+ boolean_t start, void *userdata)
+{
+ zfs_acl_locator_cb_t *cb = (zfs_acl_locator_cb_t *)userdata;
+
+ if (start) {
+ cb->cb_acl_node = list_head(&cb->cb_aclp->z_acl);
+ } else {
+ cb->cb_acl_node = list_next(&cb->cb_aclp->z_acl,
+ cb->cb_acl_node);
+ }
+ *dataptr = cb->cb_acl_node->z_acldata;
+ *length = cb->cb_acl_node->z_size;
+}
+
+int
+zfs_acl_chown_setattr(znode_t *zp)
+{
+ int error;
+ zfs_acl_t *aclp;
+
+ ASSERT(MUTEX_HELD(&zp->z_lock));
+ ASSERT(MUTEX_HELD(&zp->z_acl_lock));
+
+ if ((error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE)) == 0)
+ zp->z_mode = zfs_mode_compute(zp->z_mode, aclp,
+ &zp->z_pflags, zp->z_uid, zp->z_gid);
+ return (error);
+}
+
+/*
+ * common code for setting ACLs.
+ *
+ * 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, cred_t *cr, dmu_tx_t *tx)
+{
+ int error;
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ dmu_object_type_t otype;
+ zfs_acl_locator_cb_t locate = { 0 };
+ uint64_t mode;
+ sa_bulk_attr_t bulk[5];
+ uint64_t ctime[2];
+ int count = 0;
+
+ mode = zp->z_mode;
+
+ mode = zfs_mode_compute(mode, aclp, &zp->z_pflags,
+ zp->z_uid, zp->z_gid);
+
+ zp->z_mode = mode;
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
+ &mode, sizeof (mode));
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
+ &zp->z_pflags, sizeof (zp->z_pflags));
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
+ &ctime, sizeof (ctime));
+
+ if (zp->z_acl_cached) {
+ zfs_acl_free(zp->z_acl_cached);
+ zp->z_acl_cached = NULL;
+ }
+
+ /*
+ * Upgrade needed?
+ */
+ if (!zfsvfs->z_use_fuids) {
+ otype = DMU_OT_OLDACL;
+ } else {
+ if ((aclp->z_version == ZFS_ACL_VERSION_INITIAL) &&
+ (zfsvfs->z_version >= ZPL_VERSION_FUID))
+ zfs_acl_xform(zp, aclp, cr);
+ ASSERT(aclp->z_version >= ZFS_ACL_VERSION_FUID);
+ otype = DMU_OT_ACL;
+ }
+
+ /*
+ * Arrgh, we have to handle old on disk format
+ * as well as newer (preferred) SA format.
+ */
+
+ if (zp->z_is_sa) { /* the easy case, just update the ACL attribute */
+ locate.cb_aclp = aclp;
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_ACES(zfsvfs),
+ zfs_acl_data_locator, &locate, aclp->z_acl_bytes);
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_COUNT(zfsvfs),
+ NULL, &aclp->z_acl_count, sizeof (uint64_t));
+ } else { /* Painful legacy way */
+ zfs_acl_node_t *aclnode;
+ uint64_t off = 0;
+ zfs_acl_phys_t acl_phys;
+ uint64_t aoid;
+
+ if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zfsvfs),
+ &acl_phys, sizeof (acl_phys))) != 0)
+ return (error);
+
+ aoid = acl_phys.z_acl_extern_obj;
+
+ if (aclp->z_acl_bytes > ZFS_ACE_SPACE) {
+ /*
+ * If ACL was previously external and we are now
+ * converting to new ACL format then release old
+ * ACL object and create a new one.
+ */
+ if (aoid &&
+ aclp->z_version != acl_phys.z_acl_version) {
+ error = dmu_object_free(zfsvfs->z_os, aoid, tx);
+ if (error)
+ return (error);
+ aoid = 0;
+ }
+ if (aoid == 0) {
+ aoid = dmu_object_alloc(zfsvfs->z_os,
+ otype, aclp->z_acl_bytes,
+ otype == DMU_OT_ACL ?
+ DMU_OT_SYSACL : DMU_OT_NONE,
+ otype == DMU_OT_ACL ?
+ DN_MAX_BONUSLEN : 0, tx);
+ } else {
+ (void) dmu_object_set_blocksize(zfsvfs->z_os,
+ aoid, aclp->z_acl_bytes, 0, tx);
+ }
+ acl_phys.z_acl_extern_obj = aoid;
+ for (aclnode = list_head(&aclp->z_acl); aclnode;
+ aclnode = list_next(&aclp->z_acl, aclnode)) {
+ if (aclnode->z_ace_count == 0)
+ continue;
+ dmu_write(zfsvfs->z_os, aoid, off,
+ aclnode->z_size, aclnode->z_acldata, tx);
+ off += aclnode->z_size;
+ }
+ } else {
+ void *start = acl_phys.z_ace_data;
+ /*
+ * Migrating back embedded?
+ */
+ if (acl_phys.z_acl_extern_obj) {
+ error = dmu_object_free(zfsvfs->z_os,
+ acl_phys.z_acl_extern_obj, tx);
+ if (error)
+ return (error);
+ acl_phys.z_acl_extern_obj = 0;
+ }
+
+ for (aclnode = list_head(&aclp->z_acl); aclnode;
+ aclnode = list_next(&aclp->z_acl, aclnode)) {
+ if (aclnode->z_ace_count == 0)
+ continue;
+ bcopy(aclnode->z_acldata, start,
+ aclnode->z_size);
+ start = (caddr_t)start + aclnode->z_size;
+ }
+ }
+ /*
+ * If Old version then swap count/bytes to match old
+ * layout of znode_acl_phys_t.
+ */
+ if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
+ acl_phys.z_acl_size = aclp->z_acl_count;
+ acl_phys.z_acl_count = aclp->z_acl_bytes;
+ } else {
+ acl_phys.z_acl_size = aclp->z_acl_bytes;
+ acl_phys.z_acl_count = aclp->z_acl_count;
+ }
+ acl_phys.z_acl_version = aclp->z_version;
+
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
+ &acl_phys, sizeof (acl_phys));
+ }
+
+ /*
+ * Replace ACL wide bits, but first clear them.
+ */
+ zp->z_pflags &= ~ZFS_ACL_WIDE_FLAGS;
+
+ zp->z_pflags |= aclp->z_hints;
+
+ if (ace_trivial_common(aclp, 0, zfs_ace_walk) == 0)
+ zp->z_pflags |= ZFS_ACL_TRIVIAL;
+
+ zfs_tstamp_update_setup(zp, STATE_CHANGED, NULL, ctime, B_TRUE);
+ return (sa_bulk_update(zp->z_sa_hdl, bulk, count, tx));
+}
+
+/*
+ * Update access mask for prepended ACE
+ *
+ * This applies the "groupmask" value for aclmode property.
+ */
+static void
+zfs_acl_prepend_fixup(zfs_acl_t *aclp, void *acep, void *origacep,
+ mode_t mode, uint64_t owner)
+{
+ int rmask, wmask, xmask;
+ int user_ace;
+ uint16_t aceflags;
+ uint32_t origmask, acepmask;
+ uint64_t fuid;
+
+ aceflags = aclp->z_ops.ace_flags_get(acep);
+ fuid = aclp->z_ops.ace_who_get(acep);
+ origmask = aclp->z_ops.ace_mask_get(origacep);
+ acepmask = aclp->z_ops.ace_mask_get(acep);
+
+ user_ace = (!(aceflags &
+ (ACE_OWNER|ACE_GROUP|ACE_IDENTIFIER_GROUP)));
+
+ if (user_ace && (fuid == owner)) {
+ rmask = S_IRUSR;
+ wmask = S_IWUSR;
+ xmask = S_IXUSR;
+ } else {
+ rmask = S_IRGRP;
+ wmask = S_IWGRP;
+ xmask = S_IXGRP;
+ }
+
+ if (origmask & ACE_READ_DATA) {
+ if (mode & rmask) {
+ acepmask &= ~ACE_READ_DATA;
+ } else {
+ acepmask |= ACE_READ_DATA;
+ }
+ }
+
+ if (origmask & ACE_WRITE_DATA) {
+ if (mode & wmask) {
+ acepmask &= ~ACE_WRITE_DATA;
+ } else {
+ acepmask |= ACE_WRITE_DATA;
+ }
+ }
+
+ if (origmask & ACE_APPEND_DATA) {
+ if (mode & wmask) {
+ acepmask &= ~ACE_APPEND_DATA;
+ } else {
+ acepmask |= ACE_APPEND_DATA;
+ }
+ }
+
+ if (origmask & ACE_EXECUTE) {
+ if (mode & xmask) {
+ acepmask &= ~ACE_EXECUTE;
+ } else {
+ acepmask |= ACE_EXECUTE;
+ }
+ }
+ aclp->z_ops.ace_mask_set(acep, acepmask);
+}
+
+static void
+zfs_acl_chmod(zfsvfs_t *zfsvfs, uint64_t mode, zfs_acl_t *aclp)
+{
+ void *acep = NULL;
+ uint64_t who;
+ int new_count, new_bytes;
+ int ace_size;
+ int entry_type;
+ uint16_t iflags, type;
+ uint32_t access_mask;
+ zfs_acl_node_t *newnode;
+ size_t abstract_size = aclp->z_ops.ace_abstract_size();
+ void *zacep;
+ uint32_t owner, group, everyone;
+ uint32_t deny1, deny2, allow0;
+
+ new_count = new_bytes = 0;
+
+ acl_trivial_access_masks((mode_t)mode, &allow0, &deny1, &deny2,
+ &owner, &group, &everyone);
+
+ newnode = zfs_acl_node_alloc((abstract_size * 6) + aclp->z_acl_bytes);
+
+ zacep = newnode->z_acldata;
+ if (allow0) {
+ zfs_set_ace(aclp, zacep, allow0, ALLOW, -1, ACE_OWNER);
+ zacep = (void *)((uintptr_t)zacep + abstract_size);
+ new_count++;
+ new_bytes += abstract_size;
+ } if (deny1) {
+ zfs_set_ace(aclp, zacep, deny1, DENY, -1, ACE_OWNER);
+ zacep = (void *)((uintptr_t)zacep + abstract_size);
+ new_count++;
+ new_bytes += abstract_size;
+ }
+ if (deny2) {
+ zfs_set_ace(aclp, zacep, deny2, DENY, -1, OWNING_GROUP);
+ zacep = (void *)((uintptr_t)zacep + abstract_size);
+ new_count++;
+ new_bytes += abstract_size;
+ }
+
+ while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
+ &iflags, &type)) {
+ uint16_t inherit_flags;
+
+ entry_type = (iflags & ACE_TYPE_FLAGS);
+ inherit_flags = (iflags & ALL_INHERIT);
+
+ if ((entry_type == ACE_OWNER || entry_type == ACE_EVERYONE ||
+ (entry_type == OWNING_GROUP)) &&
+ ((inherit_flags & ACE_INHERIT_ONLY_ACE) == 0)) {
+ continue;
+ }
+
+ if ((type != ALLOW && type != DENY) ||
+ (inherit_flags & ACE_INHERIT_ONLY_ACE)) {
+ if (inherit_flags)
+ aclp->z_hints |= ZFS_INHERIT_ACE;
+ switch (type) {
+ case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
+ case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
+ aclp->z_hints |= ZFS_ACL_OBJ_ACE;
+ break;
+ }
+ } else {
+
+ /*
+ * Limit permissions to be no greater than
+ * group permissions
+ */
+ if (zfsvfs->z_acl_inherit == ZFS_ACL_RESTRICTED) {
+ if (!(mode & S_IRGRP))
+ access_mask &= ~ACE_READ_DATA;
+ if (!(mode & S_IWGRP))
+ access_mask &=
+ ~(ACE_WRITE_DATA|ACE_APPEND_DATA);
+ if (!(mode & S_IXGRP))
+ access_mask &= ~ACE_EXECUTE;
+ access_mask &=
+ ~(ACE_WRITE_OWNER|ACE_WRITE_ACL|
+ ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS);
+ }
+ }
+ zfs_set_ace(aclp, zacep, access_mask, type, who, iflags);
+ ace_size = aclp->z_ops.ace_size(acep);
+ zacep = (void *)((uintptr_t)zacep + ace_size);
+ new_count++;
+ new_bytes += ace_size;
+ }
+ zfs_set_ace(aclp, zacep, owner, 0, -1, ACE_OWNER);
+ zacep = (void *)((uintptr_t)zacep + abstract_size);
+ zfs_set_ace(aclp, zacep, group, 0, -1, OWNING_GROUP);
+ zacep = (void *)((uintptr_t)zacep + abstract_size);
+ zfs_set_ace(aclp, zacep, everyone, 0, -1, ACE_EVERYONE);
+
+ new_count += 3;
+ new_bytes += abstract_size * 3;
+ zfs_acl_release_nodes(aclp);
+ aclp->z_acl_count = new_count;
+ aclp->z_acl_bytes = new_bytes;
+ newnode->z_ace_count = new_count;
+ newnode->z_size = new_bytes;
+ list_insert_tail(&aclp->z_acl, newnode);
+}
+
+void
+zfs_acl_chmod_setattr(znode_t *zp, zfs_acl_t **aclp, uint64_t mode)
+{
+ mutex_enter(&zp->z_acl_lock);
+ mutex_enter(&zp->z_lock);
+ *aclp = zfs_acl_alloc(zfs_acl_version_zp(zp));
+ (*aclp)->z_hints = zp->z_pflags & V4_ACL_WIDE_FLAGS;
+ zfs_acl_chmod(zp->z_zfsvfs, mode, *aclp);
+ mutex_exit(&zp->z_lock);
+ mutex_exit(&zp->z_acl_lock);
+ ASSERT(*aclp);
+}
+
+/*
+ * strip off write_owner and write_acl
+ */
+static void
+zfs_restricted_update(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, void *acep)
+{
+ uint32_t mask = aclp->z_ops.ace_mask_get(acep);
+
+ if ((zfsvfs->z_acl_inherit == ZFS_ACL_RESTRICTED) &&
+ (aclp->z_ops.ace_type_get(acep) == ALLOW)) {
+ mask &= ~RESTRICTED_CLEAR;
+ aclp->z_ops.ace_mask_set(acep, mask);
+ }
+}
+
+/*
+ * Should ACE be inherited?
+ */
+static int
+zfs_ace_can_use(vtype_t vtype, uint16_t acep_flags)
+{
+ int iflags = (acep_flags & 0xf);
+
+ if ((vtype == VDIR) && (iflags & ACE_DIRECTORY_INHERIT_ACE))
+ return (1);
+ else if (iflags & ACE_FILE_INHERIT_ACE)
+ return (!((vtype == VDIR) &&
+ (iflags & ACE_NO_PROPAGATE_INHERIT_ACE)));
+ return (0);
+}
+
+/*
+ * inherit inheritable ACEs from parent
+ */
+static zfs_acl_t *
+zfs_acl_inherit(zfsvfs_t *zfsvfs, vtype_t vtype, zfs_acl_t *paclp,
+ uint64_t mode, boolean_t *need_chmod)
+{
+ void *pacep;
+ void *acep;
+ zfs_acl_node_t *aclnode;
+ zfs_acl_t *aclp = NULL;
+ uint64_t who;
+ uint32_t access_mask;
+ uint16_t iflags, newflags, type;
+ size_t ace_size;
+ void *data1, *data2;
+ size_t data1sz, data2sz;
+ boolean_t vdir = vtype == VDIR;
+ boolean_t vreg = vtype == VREG;
+ boolean_t passthrough, passthrough_x, noallow;
+
+ passthrough_x =
+ zfsvfs->z_acl_inherit == ZFS_ACL_PASSTHROUGH_X;
+ passthrough = passthrough_x ||
+ zfsvfs->z_acl_inherit == ZFS_ACL_PASSTHROUGH;
+ noallow =
+ zfsvfs->z_acl_inherit == ZFS_ACL_NOALLOW;
+
+ *need_chmod = B_TRUE;
+ pacep = NULL;
+ aclp = zfs_acl_alloc(paclp->z_version);
+ if (zfsvfs->z_acl_inherit == ZFS_ACL_DISCARD || vtype == VLNK)
+ return (aclp);
+ while (pacep = zfs_acl_next_ace(paclp, pacep, &who,
+ &access_mask, &iflags, &type)) {
+
+ /*
+ * don't inherit bogus ACEs
+ */
+ if (!zfs_acl_valid_ace_type(type, iflags))
+ continue;
+
+ if (noallow && type == ALLOW)
+ continue;
+
+ ace_size = aclp->z_ops.ace_size(pacep);
+
+ if (!zfs_ace_can_use(vtype, iflags))
+ continue;
+
+ /*
+ * If owner@, group@, or everyone@ inheritable
+ * then zfs_acl_chmod() isn't needed.
+ */
+ if (passthrough &&
+ ((iflags & (ACE_OWNER|ACE_EVERYONE)) ||
+ ((iflags & OWNING_GROUP) ==
+ OWNING_GROUP)) && (vreg || (vdir && (iflags &
+ ACE_DIRECTORY_INHERIT_ACE)))) {
+ *need_chmod = B_FALSE;
+ }
+
+ if (!vdir && passthrough_x &&
+ ((mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0)) {
+ access_mask &= ~ACE_EXECUTE;
+ }
+
+ aclnode = zfs_acl_node_alloc(ace_size);
+ list_insert_tail(&aclp->z_acl, aclnode);
+ acep = aclnode->z_acldata;
+
+ zfs_set_ace(aclp, acep, access_mask, type,
+ who, iflags|ACE_INHERITED_ACE);
+
+ /*
+ * Copy special opaque data if any
+ */
+ if ((data1sz = paclp->z_ops.ace_data(pacep, &data1)) != 0) {
+ VERIFY((data2sz = aclp->z_ops.ace_data(acep,
+ &data2)) == data1sz);
+ bcopy(data1, data2, data2sz);
+ }
+
+ aclp->z_acl_count++;
+ aclnode->z_ace_count++;
+ aclp->z_acl_bytes += aclnode->z_size;
+ newflags = aclp->z_ops.ace_flags_get(acep);
+
+ if (vdir)
+ aclp->z_hints |= ZFS_INHERIT_ACE;
+
+ if ((iflags & ACE_NO_PROPAGATE_INHERIT_ACE) || !vdir) {
+ newflags &= ~ALL_INHERIT;
+ aclp->z_ops.ace_flags_set(acep,
+ newflags|ACE_INHERITED_ACE);
+ zfs_restricted_update(zfsvfs, aclp, acep);
+ continue;
+ }
+
+ ASSERT(vdir);
+
+ /*
+ * If only FILE_INHERIT is set then turn on
+ * inherit_only
+ */
+ if ((iflags & (ACE_FILE_INHERIT_ACE |
+ ACE_DIRECTORY_INHERIT_ACE)) == ACE_FILE_INHERIT_ACE) {
+ newflags |= ACE_INHERIT_ONLY_ACE;
+ aclp->z_ops.ace_flags_set(acep,
+ newflags|ACE_INHERITED_ACE);
+ } else {
+ newflags &= ~ACE_INHERIT_ONLY_ACE;
+ aclp->z_ops.ace_flags_set(acep,
+ newflags|ACE_INHERITED_ACE);
+ }
+ }
+ return (aclp);
+}
+
+/*
+ * Create file system object initial permissions
+ * including inheritable ACEs.
+ */
+int
+zfs_acl_ids_create(znode_t *dzp, int flag, vattr_t *vap, cred_t *cr,
+ vsecattr_t *vsecp, zfs_acl_ids_t *acl_ids)
+{
+ int error;
+ zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
+ zfs_acl_t *paclp;
+ gid_t gid;
+ boolean_t need_chmod = B_TRUE;
+ boolean_t inherited = B_FALSE;
+
+ bzero(acl_ids, sizeof (zfs_acl_ids_t));
+ acl_ids->z_mode = MAKEIMODE(vap->va_type, vap->va_mode);
+
+ if (vsecp)
+ if ((error = zfs_vsec_2_aclp(zfsvfs, vap->va_type, vsecp, cr,
+ &acl_ids->z_fuidp, &acl_ids->z_aclp)) != 0)
+ return (error);
+ /*
+ * Determine uid and gid.
+ */
+ if ((flag & IS_ROOT_NODE) || zfsvfs->z_replay ||
+ ((flag & IS_XATTR) && (vap->va_type == VDIR))) {
+ acl_ids->z_fuid = zfs_fuid_create(zfsvfs,
+ (uint64_t)vap->va_uid, cr,
+ ZFS_OWNER, &acl_ids->z_fuidp);
+ acl_ids->z_fgid = zfs_fuid_create(zfsvfs,
+ (uint64_t)vap->va_gid, cr,
+ ZFS_GROUP, &acl_ids->z_fuidp);
+ gid = vap->va_gid;
+ } else {
+ acl_ids->z_fuid = zfs_fuid_create_cred(zfsvfs, ZFS_OWNER,
+ cr, &acl_ids->z_fuidp);
+ acl_ids->z_fgid = 0;
+ if (vap->va_mask & AT_GID) {
+ acl_ids->z_fgid = zfs_fuid_create(zfsvfs,
+ (uint64_t)vap->va_gid,
+ cr, ZFS_GROUP, &acl_ids->z_fuidp);
+ gid = vap->va_gid;
+ if (acl_ids->z_fgid != dzp->z_gid &&
+ !groupmember(vap->va_gid, cr) &&
+ secpolicy_vnode_create_gid(cr) != 0)
+ acl_ids->z_fgid = 0;
+ }
+ if (acl_ids->z_fgid == 0) {
+ if (dzp->z_mode & S_ISGID) {
+ char *domain;
+ uint32_t rid;
+
+ acl_ids->z_fgid = dzp->z_gid;
+ gid = zfs_fuid_map_id(zfsvfs, acl_ids->z_fgid,
+ cr, ZFS_GROUP);
+
+ if (zfsvfs->z_use_fuids &&
+ IS_EPHEMERAL(acl_ids->z_fgid)) {
+ domain = zfs_fuid_idx_domain(
+ &zfsvfs->z_fuid_idx,
+ FUID_INDEX(acl_ids->z_fgid));
+ rid = FUID_RID(acl_ids->z_fgid);
+ zfs_fuid_node_add(&acl_ids->z_fuidp,
+ domain, rid,
+ FUID_INDEX(acl_ids->z_fgid),
+ acl_ids->z_fgid, ZFS_GROUP);
+ }
+ } else {
+ acl_ids->z_fgid = zfs_fuid_create_cred(zfsvfs,
+ ZFS_GROUP, cr, &acl_ids->z_fuidp);
+ 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 (!(flag & IS_ROOT_NODE) && (dzp->z_mode & S_ISGID) &&
+ (vap->va_type == VDIR)) {
+ acl_ids->z_mode |= S_ISGID;
+ } else {
+ if ((acl_ids->z_mode & S_ISGID) &&
+ secpolicy_vnode_setids_setgids(cr, gid) != 0)
+ acl_ids->z_mode &= ~S_ISGID;
+ }
+
+ if (acl_ids->z_aclp == NULL) {
+ mutex_enter(&dzp->z_acl_lock);
+ mutex_enter(&dzp->z_lock);
+ if (!(flag & IS_ROOT_NODE) && (ZTOV(dzp)->v_type == VDIR &&
+ (dzp->z_pflags & ZFS_INHERIT_ACE)) &&
+ !(dzp->z_pflags & ZFS_XATTR)) {
+ VERIFY(0 == zfs_acl_node_read(dzp, B_TRUE,
+ &paclp, B_FALSE));
+ acl_ids->z_aclp = zfs_acl_inherit(zfsvfs,
+ vap->va_type, paclp, acl_ids->z_mode, &need_chmod);
+ inherited = B_TRUE;
+ } else {
+ acl_ids->z_aclp =
+ zfs_acl_alloc(zfs_acl_version_zp(dzp));
+ acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL;
+ }
+ mutex_exit(&dzp->z_lock);
+ mutex_exit(&dzp->z_acl_lock);
+ if (need_chmod) {
+ acl_ids->z_aclp->z_hints |= (vap->va_type == VDIR) ?
+ ZFS_ACL_AUTO_INHERIT : 0;
+ zfs_acl_chmod(zfsvfs, acl_ids->z_mode, acl_ids->z_aclp);
+ }
+ }
+
+ if (inherited || vsecp) {
+ acl_ids->z_mode = zfs_mode_compute(acl_ids->z_mode,
+ acl_ids->z_aclp, &acl_ids->z_aclp->z_hints,
+ acl_ids->z_fuid, acl_ids->z_fgid);
+ if (ace_trivial_common(acl_ids->z_aclp, 0, zfs_ace_walk) == 0)
+ acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL;
+ }
+
+ return (0);
+}
+
+/*
+ * Free ACL and fuid_infop, but not the acl_ids structure
+ */
+void
+zfs_acl_ids_free(zfs_acl_ids_t *acl_ids)
+{
+ if (acl_ids->z_aclp)
+ zfs_acl_free(acl_ids->z_aclp);
+ if (acl_ids->z_fuidp)
+ zfs_fuid_info_free(acl_ids->z_fuidp);
+ acl_ids->z_aclp = NULL;
+ acl_ids->z_fuidp = NULL;
+}
+
+boolean_t
+zfs_acl_ids_overquota(zfsvfs_t *zfsvfs, zfs_acl_ids_t *acl_ids)
+{
+ return (zfs_fuid_overquota(zfsvfs, B_FALSE, acl_ids->z_fuid) ||
+ zfs_fuid_overquota(zfsvfs, B_TRUE, acl_ids->z_fgid));
+}
+
+/*
+ * Retrieve a files ACL
+ */
+int
+zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
+{
+ zfs_acl_t *aclp;
+ ulong_t mask;
+ int error;
+ int count = 0;
+ int largeace = 0;
+
+ mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT |
+ VSA_ACE_ACLFLAGS | VSA_ACE_ALLTYPES);
+
+ if (mask == 0)
+ return (ENOSYS);
+
+ if (error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr))
+ return (error);
+
+ mutex_enter(&zp->z_acl_lock);
+
+ error = zfs_acl_node_read(zp, B_FALSE, &aclp, B_FALSE);
+ if (error != 0) {
+ mutex_exit(&zp->z_acl_lock);
+ return (error);
+ }
+
+ /*
+ * Scan ACL to determine number of ACEs
+ */
+ if ((zp->z_pflags & ZFS_ACL_OBJ_ACE) && !(mask & VSA_ACE_ALLTYPES)) {
+ void *zacep = NULL;
+ uint64_t who;
+ uint32_t access_mask;
+ uint16_t type, iflags;
+
+ while (zacep = zfs_acl_next_ace(aclp, zacep,
+ &who, &access_mask, &iflags, &type)) {
+ switch (type) {
+ case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
+ case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
+ case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
+ largeace++;
+ continue;
+ default:
+ count++;
+ }
+ }
+ vsecp->vsa_aclcnt = count;
+ } else
+ count = (int)aclp->z_acl_count;
+
+ if (mask & VSA_ACECNT) {
+ vsecp->vsa_aclcnt = count;
+ }
+
+ if (mask & VSA_ACE) {
+ size_t aclsz;
+
+ aclsz = count * sizeof (ace_t) +
+ sizeof (ace_object_t) * largeace;
+
+ vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP);
+ vsecp->vsa_aclentsz = aclsz;
+
+ if (aclp->z_version == ZFS_ACL_VERSION_FUID)
+ zfs_copy_fuid_2_ace(zp->z_zfsvfs, aclp, cr,
+ vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES));
+ else {
+ zfs_acl_node_t *aclnode;
+ void *start = vsecp->vsa_aclentp;
+
+ for (aclnode = list_head(&aclp->z_acl); aclnode;
+ aclnode = list_next(&aclp->z_acl, aclnode)) {
+ bcopy(aclnode->z_acldata, start,
+ aclnode->z_size);
+ start = (caddr_t)start + aclnode->z_size;
+ }
+ ASSERT((caddr_t)start - (caddr_t)vsecp->vsa_aclentp ==
+ aclp->z_acl_bytes);
+ }
+ }
+ if (mask & VSA_ACE_ACLFLAGS) {
+ vsecp->vsa_aclflags = 0;
+ if (zp->z_pflags & ZFS_ACL_DEFAULTED)
+ vsecp->vsa_aclflags |= ACL_DEFAULTED;
+ if (zp->z_pflags & ZFS_ACL_PROTECTED)
+ vsecp->vsa_aclflags |= ACL_PROTECTED;
+ if (zp->z_pflags & ZFS_ACL_AUTO_INHERIT)
+ vsecp->vsa_aclflags |= ACL_AUTO_INHERIT;
+ }
+
+ mutex_exit(&zp->z_acl_lock);
+
+ return (0);
+}
+
+int
+zfs_vsec_2_aclp(zfsvfs_t *zfsvfs, vtype_t obj_type,
+ vsecattr_t *vsecp, cred_t *cr, zfs_fuid_info_t **fuidp, zfs_acl_t **zaclp)
+{
+ zfs_acl_t *aclp;
+ zfs_acl_node_t *aclnode;
+ int aclcnt = vsecp->vsa_aclcnt;
+ int error;
+
+ if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES || vsecp->vsa_aclcnt <= 0)
+ return (EINVAL);
+
+ aclp = zfs_acl_alloc(zfs_acl_version(zfsvfs->z_version));
+
+ aclp->z_hints = 0;
+ aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t));
+ if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
+ if ((error = zfs_copy_ace_2_oldace(obj_type, aclp,
+ (ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata,
+ aclcnt, &aclnode->z_size)) != 0) {
+ zfs_acl_free(aclp);
+ zfs_acl_node_free(aclnode);
+ return (error);
+ }
+ } else {
+ if ((error = zfs_copy_ace_2_fuid(zfsvfs, obj_type, aclp,
+ vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt,
+ &aclnode->z_size, fuidp, cr)) != 0) {
+ zfs_acl_free(aclp);
+ zfs_acl_node_free(aclnode);
+ return (error);
+ }
+ }
+ aclp->z_acl_bytes = aclnode->z_size;
+ aclnode->z_ace_count = aclcnt;
+ aclp->z_acl_count = aclcnt;
+ list_insert_head(&aclp->z_acl, aclnode);
+
+ /*
+ * If flags are being set then add them to z_hints
+ */
+ if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) {
+ if (vsecp->vsa_aclflags & ACL_PROTECTED)
+ aclp->z_hints |= ZFS_ACL_PROTECTED;
+ if (vsecp->vsa_aclflags & ACL_DEFAULTED)
+ aclp->z_hints |= ZFS_ACL_DEFAULTED;
+ if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT)
+ aclp->z_hints |= ZFS_ACL_AUTO_INHERIT;
+ }
+
+ *zaclp = aclp;
+
+ return (0);
+}
+
+/*
+ * Set a files ACL
+ */
+int
+zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
+{
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ zilog_t *zilog = zfsvfs->z_log;
+ ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT);
+ dmu_tx_t *tx;
+ int error;
+ zfs_acl_t *aclp;
+ zfs_fuid_info_t *fuidp = NULL;
+ boolean_t fuid_dirtied;
+ uint64_t acl_obj;
+
+ if (mask == 0)
+ return (ENOSYS);
+
+ if (zp->z_pflags & ZFS_IMMUTABLE)
+ return (EPERM);
+
+ if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr))
+ return (error);
+
+ error = zfs_vsec_2_aclp(zfsvfs, ZTOV(zp)->v_type, vsecp, cr, &fuidp,
+ &aclp);
+ if (error)
+ return (error);
+
+ /*
+ * If ACL wide flags aren't being set then preserve any
+ * existing flags.
+ */
+ if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) {
+ aclp->z_hints |=
+ (zp->z_pflags & V4_ACL_WIDE_FLAGS);
+ }
+top:
+ mutex_enter(&zp->z_acl_lock);
+ mutex_enter(&zp->z_lock);
+
+ tx = dmu_tx_create(zfsvfs->z_os);
+
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
+
+ fuid_dirtied = zfsvfs->z_fuid_dirty;
+ if (fuid_dirtied)
+ zfs_fuid_txhold(zfsvfs, tx);
+
+ /*
+ * If old version and ACL won't fit in bonus and we aren't
+ * upgrading then take out necessary DMU holds
+ */
+
+ if ((acl_obj = zfs_external_acl(zp)) != 0) {
+ if (zfsvfs->z_version >= ZPL_VERSION_FUID &&
+ zfs_znode_acl_version(zp) <= ZFS_ACL_VERSION_INITIAL) {
+ dmu_tx_hold_free(tx, acl_obj, 0,
+ DMU_OBJECT_END);
+ dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
+ aclp->z_acl_bytes);
+ } else {
+ dmu_tx_hold_write(tx, acl_obj, 0, aclp->z_acl_bytes);
+ }
+ } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
+ dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes);
+ }
+
+ zfs_sa_upgrade_txholds(tx, zp);
+ error = dmu_tx_assign(tx, TXG_NOWAIT);
+ if (error) {
+ mutex_exit(&zp->z_acl_lock);
+ mutex_exit(&zp->z_lock);
+
+ if (error == ERESTART) {
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ goto top;
+ }
+ dmu_tx_abort(tx);
+ zfs_acl_free(aclp);
+ return (error);
+ }
+
+ error = zfs_aclset_common(zp, aclp, cr, tx);
+ ASSERT(error == 0);
+ ASSERT(zp->z_acl_cached == NULL);
+ zp->z_acl_cached = aclp;
+
+ if (fuid_dirtied)
+ zfs_fuid_sync(zfsvfs, tx);
+
+ zfs_log_acl(zilog, tx, zp, vsecp, fuidp);
+
+ if (fuidp)
+ zfs_fuid_info_free(fuidp);
+ dmu_tx_commit(tx);
+done:
+ mutex_exit(&zp->z_lock);
+ mutex_exit(&zp->z_acl_lock);
+
+ return (error);
+}
+
+/*
+ * Check accesses of interest (AoI) against attributes of the dataset
+ * such as read-only. Returns zero if no AoI conflict with dataset
+ * attributes, otherwise an appropriate errno is returned.
+ */
+static int
+zfs_zaccess_dataset_check(znode_t *zp, uint32_t v4_mode)
+{
+ if ((v4_mode & WRITE_MASK) &&
+ (zp->z_zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) &&
+ (!IS_DEVVP(ZTOV(zp)) ||
+ (IS_DEVVP(ZTOV(zp)) && (v4_mode & WRITE_MASK_ATTRS)))) {
+ return (EROFS);
+ }
+
+ /*
+ * Only check for READONLY on non-directories.
+ */
+ if ((v4_mode & WRITE_MASK_DATA) &&
+ (((ZTOV(zp)->v_type != VDIR) &&
+ (zp->z_pflags & (ZFS_READONLY | ZFS_IMMUTABLE))) ||
+ (ZTOV(zp)->v_type == VDIR &&
+ (zp->z_pflags & ZFS_IMMUTABLE)))) {
+ return (EPERM);
+ }
+
+ if ((v4_mode & (ACE_DELETE | ACE_DELETE_CHILD)) &&
+ (zp->z_pflags & ZFS_NOUNLINK)) {
+ return (EPERM);
+ }
+
+ if (((v4_mode & (ACE_READ_DATA|ACE_EXECUTE)) &&
+ (zp->z_pflags & ZFS_AV_QUARANTINED))) {
+ return (EACCES);
+ }
+
+ return (0);
+}
+
+/*
+ * The primary usage of this function is to loop through all of the
+ * ACEs in the znode, determining what accesses of interest (AoI) to
+ * the caller are allowed or denied. The AoI are expressed as bits in
+ * the working_mode parameter. As each ACE is processed, bits covered
+ * by that ACE are removed from the working_mode. This removal
+ * facilitates two things. The first is that when the working mode is
+ * empty (= 0), we know we've looked at all the AoI. The second is
+ * that the ACE interpretation rules don't allow a later ACE to undo
+ * something granted or denied by an earlier ACE. Removing the
+ * discovered access or denial enforces this rule. At the end of
+ * processing the ACEs, all AoI that were found to be denied are
+ * placed into the working_mode, giving the caller a mask of denied
+ * accesses. Returns:
+ * 0 if all AoI granted
+ * EACCESS if the denied mask is non-zero
+ * other error if abnormal failure (e.g., IO error)
+ *
+ * A secondary usage of the function is to determine if any of the
+ * AoI are granted. If an ACE grants any access in
+ * the working_mode, we immediately short circuit out of the function.
+ * This mode is chosen by setting anyaccess to B_TRUE. The
+ * working_mode is not a denied access mask upon exit if the function
+ * is used in this manner.
+ */
+static int
+zfs_zaccess_aces_check(znode_t *zp, uint32_t *working_mode,
+ boolean_t anyaccess, cred_t *cr)
+{
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ zfs_acl_t *aclp;
+ int error;
+ uid_t uid = crgetuid(cr);
+ uint64_t who;
+ uint16_t type, iflags;
+ uint16_t entry_type;
+ uint32_t access_mask;
+ uint32_t deny_mask = 0;
+ zfs_ace_hdr_t *acep = NULL;
+ boolean_t checkit;
+ uid_t gowner;
+ uid_t fowner;
+
+ zfs_fuid_map_ids(zp, cr, &fowner, &gowner);
+
+ mutex_enter(&zp->z_acl_lock);
+
+ error = zfs_acl_node_read(zp, B_FALSE, &aclp, B_FALSE);
+ if (error != 0) {
+ mutex_exit(&zp->z_acl_lock);
+ return (error);
+ }
+
+ ASSERT(zp->z_acl_cached);
+
+ while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
+ &iflags, &type)) {
+ uint32_t mask_matched;
+
+ if (!zfs_acl_valid_ace_type(type, iflags))
+ continue;
+
+ if (ZTOV(zp)->v_type == VDIR && (iflags & ACE_INHERIT_ONLY_ACE))
+ continue;
+
+ /* Skip ACE if it does not affect any AoI */
+ mask_matched = (access_mask & *working_mode);
+ if (!mask_matched)
+ continue;
+
+ entry_type = (iflags & ACE_TYPE_FLAGS);
+
+ checkit = B_FALSE;
+
+ switch (entry_type) {
+ case ACE_OWNER:
+ if (uid == fowner)
+ checkit = B_TRUE;
+ break;
+ case OWNING_GROUP:
+ who = gowner;
+ /*FALLTHROUGH*/
+ case ACE_IDENTIFIER_GROUP:
+ checkit = zfs_groupmember(zfsvfs, who, cr);
+ break;
+ case ACE_EVERYONE:
+ checkit = B_TRUE;
+ break;
+
+ /* USER Entry */
+ default:
+ if (entry_type == 0) {
+ uid_t newid;
+
+ newid = zfs_fuid_map_id(zfsvfs, who, cr,
+ ZFS_ACE_USER);
+ if (newid != IDMAP_WK_CREATOR_OWNER_UID &&
+ uid == newid)
+ checkit = B_TRUE;
+ break;
+ } else {
+ mutex_exit(&zp->z_acl_lock);
+ return (EIO);
+ }
+ }
+
+ if (checkit) {
+ if (type == DENY) {
+ DTRACE_PROBE3(zfs__ace__denies,
+ znode_t *, zp,
+ zfs_ace_hdr_t *, acep,
+ uint32_t, mask_matched);
+ deny_mask |= mask_matched;
+ } else {
+ DTRACE_PROBE3(zfs__ace__allows,
+ znode_t *, zp,
+ zfs_ace_hdr_t *, acep,
+ uint32_t, mask_matched);
+ if (anyaccess) {
+ mutex_exit(&zp->z_acl_lock);
+ return (0);
+ }
+ }
+ *working_mode &= ~mask_matched;
+ }
+
+ /* Are we done? */
+ if (*working_mode == 0)
+ break;
+ }
+
+ mutex_exit(&zp->z_acl_lock);
+
+ /* Put the found 'denies' back on the working mode */
+ if (deny_mask) {
+ *working_mode |= deny_mask;
+ return (EACCES);
+ } else if (*working_mode) {
+ return (-1);
+ }
+
+ return (0);
+}
+
+/*
+ * Return true if any access whatsoever granted, we don't actually
+ * care what access is granted.
+ */
+boolean_t
+zfs_has_access(znode_t *zp, cred_t *cr)
+{
+ uint32_t have = ACE_ALL_PERMS;
+
+ if (zfs_zaccess_aces_check(zp, &have, B_TRUE, cr) != 0) {
+ uid_t owner;
+
+ owner = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_uid, cr, ZFS_OWNER);
+ return (secpolicy_vnode_any_access(cr, ZTOV(zp), owner) == 0);
+ }
+ return (B_TRUE);
+}
+
+static int
+zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode,
+ boolean_t *check_privs, boolean_t skipaclchk, cred_t *cr)
+{
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ int err;
+
+ *working_mode = v4_mode;
+ *check_privs = B_TRUE;
+
+ /*
+ * Short circuit empty requests
+ */
+ if (v4_mode == 0 || zfsvfs->z_replay) {
+ *working_mode = 0;
+ return (0);
+ }
+
+ if ((err = zfs_zaccess_dataset_check(zp, v4_mode)) != 0) {
+ *check_privs = B_FALSE;
+ return (err);
+ }
+
+ /*
+ * The caller requested that the ACL check be skipped. This
+ * would only happen if the caller checked VOP_ACCESS() with a
+ * 32 bit ACE mask and already had the appropriate permissions.
+ */
+ if (skipaclchk) {
+ *working_mode = 0;
+ return (0);
+ }
+
+ return (zfs_zaccess_aces_check(zp, working_mode, B_FALSE, cr));
+}
+
+static int
+zfs_zaccess_append(znode_t *zp, uint32_t *working_mode, boolean_t *check_privs,
+ cred_t *cr)
+{
+ if (*working_mode != ACE_WRITE_DATA)
+ return (EACCES);
+
+ return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode,
+ check_privs, B_FALSE, cr));
+}
+
+int
+zfs_fastaccesschk_execute(znode_t *zdp, cred_t *cr)
+{
+ boolean_t owner = B_FALSE;
+ boolean_t groupmbr = B_FALSE;
+ boolean_t is_attr;
+ uid_t uid = crgetuid(cr);
+ int error;
+
+ if (zdp->z_pflags & ZFS_AV_QUARANTINED)
+ return (EACCES);
+
+ is_attr = ((zdp->z_pflags & ZFS_XATTR) &&
+ (ZTOV(zdp)->v_type == VDIR));
+ if (is_attr)
+ goto slow;
+
+
+ mutex_enter(&zdp->z_acl_lock);
+
+ if (zdp->z_pflags & ZFS_NO_EXECS_DENIED) {
+ mutex_exit(&zdp->z_acl_lock);
+ return (0);
+ }
+
+ if (FUID_INDEX(zdp->z_uid) != 0 || FUID_INDEX(zdp->z_gid) != 0) {
+ mutex_exit(&zdp->z_acl_lock);
+ goto slow;
+ }
+
+ if (uid == zdp->z_uid) {
+ owner = B_TRUE;
+ if (zdp->z_mode & S_IXUSR) {
+ mutex_exit(&zdp->z_acl_lock);
+ return (0);
+ } else {
+ mutex_exit(&zdp->z_acl_lock);
+ goto slow;
+ }
+ }
+ if (groupmember(zdp->z_gid, cr)) {
+ groupmbr = B_TRUE;
+ if (zdp->z_mode & S_IXGRP) {
+ mutex_exit(&zdp->z_acl_lock);
+ return (0);
+ } else {
+ mutex_exit(&zdp->z_acl_lock);
+ goto slow;
+ }
+ }
+ if (!owner && !groupmbr) {
+ if (zdp->z_mode & S_IXOTH) {
+ mutex_exit(&zdp->z_acl_lock);
+ return (0);
+ }
+ }
+
+ mutex_exit(&zdp->z_acl_lock);
+
+slow:
+ DTRACE_PROBE(zfs__fastpath__execute__access__miss);
+ ZFS_ENTER(zdp->z_zfsvfs);
+ error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr);
+ ZFS_EXIT(zdp->z_zfsvfs);
+ return (error);
+}
+
+/*
+ * Determine whether Access should be granted/denied.
+ * The least priv subsytem is always consulted as a basic privilege
+ * can define any form of access.
+ */
+int
+zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr)
+{
+ uint32_t working_mode;
+ int error;
+ int is_attr;
+ boolean_t check_privs;
+ znode_t *xzp;
+ znode_t *check_zp = zp;
+ mode_t needed_bits;
+ uid_t owner;
+
+ is_attr = ((zp->z_pflags & ZFS_XATTR) && (ZTOV(zp)->v_type == VDIR));
+
+ /*
+ * If attribute then validate against base file
+ */
+ if (is_attr) {
+ uint64_t parent;
+
+ if ((error = sa_lookup(zp->z_sa_hdl,
+ SA_ZPL_PARENT(zp->z_zfsvfs), &parent,
+ sizeof (parent))) != 0)
+ return (error);
+
+ if ((error = zfs_zget(zp->z_zfsvfs,
+ 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;
+ }
+ }
+
+ owner = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_uid, cr, ZFS_OWNER);
+ /*
+ * Map the bits required to the standard vnode flags VREAD|VWRITE|VEXEC
+ * in needed_bits. Map the bits mapped by working_mode (currently
+ * missing) in missing_bits.
+ * Call secpolicy_vnode_access2() with (needed_bits & ~checkmode),
+ * needed_bits.
+ */
+ needed_bits = 0;
+
+ working_mode = mode;
+ if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) &&
+ owner == crgetuid(cr))
+ working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES);
+
+ if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS|
+ ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE))
+ needed_bits |= VREAD;
+ if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS|
+ ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE))
+ needed_bits |= VWRITE;
+ if (working_mode & ACE_EXECUTE)
+ needed_bits |= VEXEC;
+
+ if ((error = zfs_zaccess_common(check_zp, mode, &working_mode,
+ &check_privs, skipaclchk, cr)) == 0) {
+ if (is_attr)
+ VN_RELE(ZTOV(xzp));
+ return (secpolicy_vnode_access2(cr, ZTOV(zp), owner,
+ needed_bits, needed_bits));
+ }
+
+ if (error && !check_privs) {
+ if (is_attr)
+ VN_RELE(ZTOV(xzp));
+ return (error);
+ }
+
+ if (error && (flags & V_APPEND)) {
+ error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr);
+ }
+
+ if (error && check_privs) {
+ mode_t checkmode = 0;
+
+ /*
+ * First check for implicit owner permission on
+ * read_acl/read_attributes
+ */
+
+ error = 0;
+ ASSERT(working_mode != 0);
+
+ if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES) &&
+ owner == crgetuid(cr)))
+ working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES);
+
+ if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS|
+ ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE))
+ checkmode |= VREAD;
+ if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS|
+ ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE))
+ checkmode |= VWRITE;
+ if (working_mode & ACE_EXECUTE)
+ checkmode |= VEXEC;
+
+ error = secpolicy_vnode_access2(cr, ZTOV(check_zp), owner,
+ needed_bits & ~checkmode, needed_bits);
+
+ if (error == 0 && (working_mode & ACE_WRITE_OWNER))
+ error = secpolicy_vnode_chown(cr, owner);
+ if (error == 0 && (working_mode & ACE_WRITE_ACL))
+ error = secpolicy_vnode_setdac(cr, owner);
+
+ if (error == 0 && (working_mode &
+ (ACE_DELETE|ACE_DELETE_CHILD)))
+ error = secpolicy_vnode_remove(cr);
+
+ if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) {
+ error = secpolicy_vnode_chown(cr, owner);
+ }
+ if (error == 0) {
+ /*
+ * See if any bits other than those already checked
+ * for are still present. If so then return EACCES
+ */
+ if (working_mode & ~(ZFS_CHECKED_MASKS)) {
+ error = EACCES;
+ }
+ }
+ } else if (error == 0) {
+ error = secpolicy_vnode_access2(cr, ZTOV(zp), owner,
+ needed_bits, needed_bits);
+ }
+
+
+ if (is_attr)
+ VN_RELE(ZTOV(xzp));
+
+ return (error);
+}
+
+/*
+ * Translate traditional unix VREAD/VWRITE/VEXEC mode into
+ * native ACL format and call zfs_zaccess()
+ */
+int
+zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr)
+{
+ return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr));
+}
+
+/*
+ * Access function for secpolicy_vnode_setattr
+ */
+int
+zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr)
+{
+ int v4_mode = zfs_unix_to_v4(mode >> 6);
+
+ return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr));
+}
+
+static int
+zfs_delete_final_check(znode_t *zp, znode_t *dzp,
+ mode_t available_perms, cred_t *cr)
+{
+ int error;
+ uid_t downer;
+
+ downer = zfs_fuid_map_id(dzp->z_zfsvfs, dzp->z_uid, cr, ZFS_OWNER);
+
+ error = secpolicy_vnode_access2(cr, ZTOV(dzp),
+ downer, available_perms, VWRITE|VEXEC);
+
+ if (error == 0)
+ error = zfs_sticky_remove_access(dzp, zp, cr);
+
+ return (error);
+}
+
+/*
+ * 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)
+{
+ uint32_t dzp_working_mode = 0;
+ uint32_t zp_working_mode = 0;
+ int dzp_error, zp_error;
+ mode_t available_perms;
+ boolean_t dzpcheck_privs = B_TRUE;
+ boolean_t zpcheck_privs = B_TRUE;
+
+ /*
+ * 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:joe:write_data:deny,user:joe:delete:allow
+ *
+ * However, deny permissions may ultimately be overridden
+ * by secpolicy_vnode_access().
+ *
+ * We will ask for all of the necessary permissions and then
+ * look at the working modes from the directory and target object
+ * to determine what was found.
+ */
+
+ if (zp->z_pflags & (ZFS_IMMUTABLE | ZFS_NOUNLINK))
+ return (EPERM);
+
+ /*
+ * First row
+ * If the directory permissions allow the delete, we are done.
+ */
+ if ((dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD,
+ &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0)
+ return (0);
+
+ /*
+ * If target object has delete permission then we are done
+ */
+ if ((zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode,
+ &zpcheck_privs, B_FALSE, cr)) == 0)
+ return (0);
+
+ ASSERT(dzp_error && zp_error);
+
+ if (!dzpcheck_privs)
+ return (dzp_error);
+ if (!zpcheck_privs)
+ return (zp_error);
+
+ /*
+ * Second row
+ *
+ * If directory returns EACCES then delete_child was denied
+ * due to deny delete_child. In this case send the request through
+ * secpolicy_vnode_remove(). We don't use zfs_delete_final_check()
+ * since that *could* allow the delete based on write/execute permission
+ * and we want delete permissions to override write/execute.
+ */
+
+ if (dzp_error == EACCES)
+ return (secpolicy_vnode_remove(cr));
+
+ /*
+ * Third Row
+ * only need to see if we have write/execute on directory.
+ */
+
+ dzp_error = zfs_zaccess_common(dzp, ACE_EXECUTE|ACE_WRITE_DATA,
+ &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr);
+
+ if (dzp_error != 0 && !dzpcheck_privs)
+ return (dzp_error);
+
+ /*
+ * Fourth row
+ */
+
+ available_perms = (dzp_working_mode & ACE_WRITE_DATA) ? 0 : VWRITE;
+ available_perms |= (dzp_working_mode & ACE_EXECUTE) ? 0 : VEXEC;
+
+ return (zfs_delete_final_check(zp, dzp, available_perms, cr));
+
+}
+
+int
+zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp,
+ znode_t *tzp, cred_t *cr)
+{
+ int add_perm;
+ int error;
+
+ if (szp->z_pflags & ZFS_AV_QUARANTINED)
+ return (EACCES);
+
+ 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
+ */
+ error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr);
+
+ return (error);
+}