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OpenZFS 742 - Resurrect the ZFS "aclmode" property OpenZFS 664 - Umas…
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…k masking "deny" ACL entries OpenZFS 279 - Bug in the new ACL (post-PSARC/2010/029) semantics

Porting notes:
* Updated zfs_acl_chmod to take 'boolean_t isdir' as first parameter
  rather than 'zfsvfs_t *zfsvfs'
* zfs man pages changes mixed between zfs and new zfsprops man pages

Reviewed by: Aram Hvrneanu <[email protected]>
Reviewed by: Gordon Ross <[email protected]>
Reviewed by: Robert Gordon <[email protected]>
Reviewed by: [email protected]
Reviewed by: Brian Behlendorf <[email protected]>
Approved by: Garrett D'Amore <[email protected]>
Ported-by: Paul B. Henson <[email protected]>

OpenZFS-issue: https://www.illumos.org/issues/742
OpenZFS-issue: https://www.illumos.org/issues/664
OpenZFS-issue: https://www.illumos.org/issues/279
OpenZFS-commit: openzfs/openzfs@a3c49ce110
Closes openzfs#10266

(cherry picked from commit a1af567)
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@pbhenson @as-com
pbhenson authored and as-com committed Jun 20, 2020
1 parent 2f35f20 commit b917b56
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Showing 6 changed files with 130 additions and 85 deletions.
1 change: 1 addition & 0 deletions include/os/linux/zfs/sys/zfs_vfsops.h
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,7 @@ struct zfsvfs {
boolean_t z_fuid_dirty; /* need to sync fuid table ? */
struct zfs_fuid_info *z_fuid_replay; /* fuid info for replay */
zilog_t *z_log; /* intent log pointer */
uint_t z_acl_mode; /* acl chmod/mode behavior */
uint_t z_acl_inherit; /* acl inheritance behavior */
uint_t z_acl_type; /* type of ACL usable on this FS */
zfs_case_t z_case; /* case-sense */
Expand Down
1 change: 1 addition & 0 deletions man/man8/zfs.8
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Original file line number Diff line number Diff line change
Expand Up @@ -398,6 +398,7 @@ pool/home/bob readonly off default
pool/home/bob zoned off default
pool/home/bob snapdir hidden default
pool/home/bob acltype off default
pool/home/bob aclmode discard default
pool/home/bob aclinherit restricted default
pool/home/bob canmount on default
pool/home/bob xattr on default
Expand Down
25 changes: 13 additions & 12 deletions man/man8/zfsprops.8
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Original file line number Diff line number Diff line change
Expand Up @@ -599,23 +599,24 @@ accordance to the requested mode from the application.
The
.Sy aclinherit
property does not apply to POSIX ACLs.
.It Sy aclmode Ns = Ns Sy discard Ns | Ns Sy groupmask Ns | Ns Sy passthrough
.Ns Sy restricted
Controls how an
.Tn ACL
is modified during
.Xr chmod 2 .
This property is not visible on Linux yet.
.It Xo
.Sy aclmode Ns = Ns Sy discard Ns | Ns Sy groupmask Ns | Ns
.Sy passthrough Ns
.Xc
Controls how an ACL is modified during chmod(2) and how inherited ACEs
are modified by the file creation mode.
.Bl -tag -width "passthrough"
.It Sy discard
default, deletes all
.Tn ACL
entries that do not represent the mode of the file.
.Sy ACEs
except for those representing
the mode of the file or directory requested by
.Xr chmod 2 .
.It Sy groupmask
reduces permissions granted in all
.Em ALLOW
entried found in the
.Tn ACL
.Sy ALLOW
entries found in the
.Sy ACL
such that they are no greater than the group permissions specified by
.Xr chmod 2 .
.It Sy passthrough
Expand Down
163 changes: 98 additions & 65 deletions module/os/linux/zfs/zfs_acl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2013 by Delphix. All rights reserved.
*/

Expand Down Expand Up @@ -1182,60 +1183,77 @@ zfs_acl_chown_setattr(znode_t *zp)
return (error);
}

static void
acl_trivial_access_masks(mode_t mode, uint32_t *allow0, uint32_t *deny1,
uint32_t *deny2, uint32_t *owner, uint32_t *group, uint32_t *everyone)
typedef struct trivial_acl {
uint32_t allow0; /* allow mask for bits only in owner */
uint32_t deny1; /* deny mask for bits not in owner */
uint32_t deny2; /* deny mask for bits not in group */
uint32_t owner; /* allow mask matching mode */
uint32_t group; /* allow mask matching mode */
uint32_t everyone; /* allow mask matching mode */
} trivial_acl_t;

void
acl_trivial_access_masks(mode_t mode, boolean_t isdir, trivial_acl_t *masks)
{
*deny1 = *deny2 = *allow0 = *group = 0;
uint32_t read_mask = ACE_READ_DATA;
uint32_t write_mask = ACE_WRITE_DATA|ACE_APPEND_DATA;
uint32_t execute_mask = ACE_EXECUTE;

if (isdir)
write_mask |= ACE_DELETE_CHILD;

masks->deny1 = 0;

if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH)))
*deny1 |= ACE_READ_DATA;
masks->deny1 |= read_mask;
if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH)))
*deny1 |= ACE_WRITE_DATA;
masks->deny1 |= write_mask;
if (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH)))
*deny1 |= ACE_EXECUTE;
masks->deny1 |= execute_mask;

masks->deny2 = 0;
if (!(mode & S_IRGRP) && (mode & S_IROTH))
*deny2 = ACE_READ_DATA;
masks->deny2 |= read_mask;
if (!(mode & S_IWGRP) && (mode & S_IWOTH))
*deny2 |= ACE_WRITE_DATA;
masks->deny2 |= write_mask;
if (!(mode & S_IXGRP) && (mode & S_IXOTH))
*deny2 |= ACE_EXECUTE;
masks->deny2 |= execute_mask;

masks->allow0 = 0;
if ((mode & S_IRUSR) && (!(mode & S_IRGRP) && (mode & S_IROTH)))
*allow0 |= ACE_READ_DATA;
masks->allow0 |= read_mask;
if ((mode & S_IWUSR) && (!(mode & S_IWGRP) && (mode & S_IWOTH)))
*allow0 |= ACE_WRITE_DATA;
masks->allow0 |= write_mask;
if ((mode & S_IXUSR) && (!(mode & S_IXGRP) && (mode & S_IXOTH)))
*allow0 |= ACE_EXECUTE;
masks->allow0 |= execute_mask;

*owner = ACE_WRITE_ATTRIBUTES|ACE_WRITE_OWNER|ACE_WRITE_ACL|
masks->owner = ACE_WRITE_ATTRIBUTES|ACE_WRITE_OWNER|ACE_WRITE_ACL|
ACE_WRITE_NAMED_ATTRS|ACE_READ_ACL|ACE_READ_ATTRIBUTES|
ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE;
if (mode & S_IRUSR)
*owner |= ACE_READ_DATA;
masks->owner |= read_mask;
if (mode & S_IWUSR)
*owner |= ACE_WRITE_DATA|ACE_APPEND_DATA;
masks->owner |= write_mask;
if (mode & S_IXUSR)
*owner |= ACE_EXECUTE;
masks->owner |= execute_mask;

*group = ACE_READ_ACL|ACE_READ_ATTRIBUTES| ACE_READ_NAMED_ATTRS|
masks->group = ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_NAMED_ATTRS|
ACE_SYNCHRONIZE;
if (mode & S_IRGRP)
*group |= ACE_READ_DATA;
masks->group |= read_mask;
if (mode & S_IWGRP)
*group |= ACE_WRITE_DATA|ACE_APPEND_DATA;
masks->group |= write_mask;
if (mode & S_IXGRP)
*group |= ACE_EXECUTE;
masks->group |= execute_mask;

*everyone = ACE_READ_ACL|ACE_READ_ATTRIBUTES| ACE_READ_NAMED_ATTRS|
masks->everyone = ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_NAMED_ATTRS|
ACE_SYNCHRONIZE;
if (mode & S_IROTH)
*everyone |= ACE_READ_DATA;
masks->everyone |= read_mask;
if (mode & S_IWOTH)
*everyone |= ACE_WRITE_DATA|ACE_APPEND_DATA;
masks->everyone |= write_mask;
if (mode & S_IXOTH)
*everyone |= ACE_EXECUTE;
masks->everyone |= execute_mask;
}

/*
Expand All @@ -1247,7 +1265,7 @@ acl_trivial_access_masks(mode_t mode, uint32_t *allow0, uint32_t *deny1,
* have read_acl denied, and write_owner/write_acl/write_attributes
* can only be owner@ entry.
*/
static int
int
ace_trivial_common(void *acep, int aclcnt,
uint64_t (*walk)(void *, uint64_t, int aclcnt,
uint16_t *, uint16_t *, uint32_t *))
Expand Down Expand Up @@ -1283,10 +1301,17 @@ ace_trivial_common(void *acep, int aclcnt,
return (1);

/*
* Delete permissions are never set by default
* Delete permission is never set by default
*/
if (mask & ACE_DELETE)
return (1);

/*
* Child delete permission should be accompanied by write
*/
if (mask & (ACE_DELETE|ACE_DELETE_CHILD))
if ((mask & ACE_DELETE_CHILD) && !(mask & ACE_WRITE_DATA))
return (1);

/*
* only allow owner@ to have
* write_acl/write_owner/write_attributes/write_xattr/
Expand Down Expand Up @@ -1462,7 +1487,7 @@ zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, dmu_tx_t *tx)
}

static void
zfs_acl_chmod(zfsvfs_t *zfsvfs, uint64_t mode, zfs_acl_t *aclp)
zfs_acl_chmod(boolean_t isdir, uint64_t mode, boolean_t trim, zfs_acl_t *aclp)
{
void *acep = NULL;
uint64_t who;
Expand All @@ -1474,31 +1499,29 @@ zfs_acl_chmod(zfsvfs_t *zfsvfs, uint64_t mode, zfs_acl_t *aclp)
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;
trivial_acl_t masks;

new_count = new_bytes = 0;

acl_trivial_access_masks((mode_t)mode, &allow0, &deny1, &deny2,
&owner, &group, &everyone);
acl_trivial_access_masks((mode_t)mode, isdir, &masks);

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);
if (masks.allow0) {
zfs_set_ace(aclp, zacep, masks.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);
if (masks.deny1) {
zfs_set_ace(aclp, zacep, masks.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);
if (masks.deny2) {
zfs_set_ace(aclp, zacep, masks.deny2, DENY, -1, OWNING_GROUP);
zacep = (void *)((uintptr_t)zacep + abstract_size);
new_count++;
new_bytes += abstract_size;
Expand All @@ -1517,10 +1540,17 @@ zfs_acl_chmod(zfsvfs_t *zfsvfs, uint64_t mode, zfs_acl_t *aclp)
continue;
}

/*
* If this ACL has any inheritable ACEs, mark that in
* the hints (which are later masked into the pflags)
* so create knows to do inheritance.
*/
if (isdir && (inherit_flags &
(ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE)))
aclp->z_hints |= ZFS_INHERIT_ACE;

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:
Expand All @@ -1533,32 +1563,25 @@ zfs_acl_chmod(zfsvfs_t *zfsvfs, uint64_t mode, zfs_acl_t *aclp)

/*
* Limit permissions to be no greater than
* group permissions
* group permissions.
* The "aclinherit" and "aclmode" properties
* affect policy for create and chmod(2),
* respectively.
*/
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);
}
if ((type == ALLOW) && trim)
access_mask &= masks.group;
}
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);
zfs_set_ace(aclp, zacep, masks.owner, 0, -1, ACE_OWNER);
zacep = (void *)((uintptr_t)zacep + abstract_size);
zfs_set_ace(aclp, zacep, group, 0, -1, OWNING_GROUP);
zfs_set_ace(aclp, zacep, masks.group, 0, -1, OWNING_GROUP);
zacep = (void *)((uintptr_t)zacep + abstract_size);
zfs_set_ace(aclp, zacep, everyone, 0, -1, ACE_EVERYONE);
zfs_set_ace(aclp, zacep, masks.everyone, 0, -1, ACE_EVERYONE);

new_count += 3;
new_bytes += abstract_size * 3;
Expand All @@ -1573,16 +1596,24 @@ zfs_acl_chmod(zfsvfs_t *zfsvfs, uint64_t mode, zfs_acl_t *aclp)
int
zfs_acl_chmod_setattr(znode_t *zp, zfs_acl_t **aclp, uint64_t mode)
{
int error = 0;

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(ZTOZSB(zp), mode, *aclp);
if (ZTOZSB(zp)->z_acl_mode == ZFS_ACL_DISCARD)
*aclp = zfs_acl_alloc(zfs_acl_version_zp(zp));
else
error = zfs_acl_node_read(zp, B_TRUE, aclp, B_TRUE);

if (error == 0) {
(*aclp)->z_hints = zp->z_pflags & V4_ACL_WIDE_FLAGS;
zfs_acl_chmod(S_ISDIR(ZTOI(zp)->i_mode), mode,
(ZTOZSB(zp)->z_acl_mode == ZFS_ACL_GROUPMASK), *aclp);
}
mutex_exit(&zp->z_lock);
mutex_exit(&zp->z_acl_lock);
ASSERT(*aclp);

return (0);
return (error);
}

/*
Expand Down Expand Up @@ -1834,8 +1865,8 @@ zfs_acl_ids_create(znode_t *dzp, int flag, vattr_t *vap, cred_t *cr,
if (acl_ids->z_aclp == NULL) {
mutex_enter(&dzp->z_acl_lock);
mutex_enter(&dzp->z_lock);
if (!(flag & IS_ROOT_NODE) && (S_ISDIR(ZTOI(dzp)->i_mode) &&
(dzp->z_pflags & ZFS_INHERIT_ACE)) &&
if (!(flag & IS_ROOT_NODE) &&
(dzp->z_pflags & ZFS_INHERIT_ACE) &&
!(dzp->z_pflags & ZFS_XATTR)) {
VERIFY(0 == zfs_acl_node_read(dzp, B_TRUE,
&paclp, B_FALSE));
Expand All @@ -1852,7 +1883,9 @@ zfs_acl_ids_create(znode_t *dzp, int flag, vattr_t *vap, cred_t *cr,
if (need_chmod) {
acl_ids->z_aclp->z_hints |= S_ISDIR(vap->va_mode) ?
ZFS_ACL_AUTO_INHERIT : 0;
zfs_acl_chmod(zfsvfs, acl_ids->z_mode, acl_ids->z_aclp);
zfs_acl_chmod(S_ISDIR(vap->va_mode), acl_ids->z_mode,
(zfsvfs->z_acl_inherit == ZFS_ACL_RESTRICTED),
acl_ids->z_aclp);
}
}

Expand Down
10 changes: 10 additions & 0 deletions module/os/linux/zfs/zfs_vfsops.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -438,6 +438,14 @@ vscan_changed_cb(void *arg, uint64_t newval)
((zfsvfs_t *)arg)->z_vscan = newval;
}

static void
acl_mode_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;

zfsvfs->z_acl_mode = newval;
}

static void
acl_inherit_changed_cb(void *arg, uint64_t newval)
{
Expand Down Expand Up @@ -497,6 +505,8 @@ zfs_register_callbacks(vfs_t *vfsp)
zfs_prop_to_name(ZFS_PROP_SNAPDIR), snapdir_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_ACLTYPE), acltype_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_ACLMODE), acl_mode_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_ACLINHERIT), acl_inherit_changed_cb,
zfsvfs);
Expand Down
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