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freebsd-nq/sys/kern/subr_acl_nfs4.c
Edward Tomasz Napierala 4c7bba9985 Adapt filesystem-independent NFSv4 ACL code (used by UFS, but not by ZFS) 
to PSARC/2010/029.  In short, the semantics is simplified - "weird stuff"
no longer happens after chmod, entries don't get duplicated during
inheritance, and trivial ACLs no longer contain three "DENY" entries,
which is also more friendly to MS Windows.

By default, UFS keeps using old semantics.  To change it, set sysctl
vfs.acl_nfs4_old_semantics to 0.  I'll flip the switch when ZFSv28
hits the tree, to keep these two in sync - ZFS v28 uses PSARC semantics,
and ZFS v15 uses the old one.
2010-12-13 18:56:04 +00:00

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/*-
* Copyright (c) 2008-2010 Edward Tomasz Napierała <trasz@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* ACL support routines specific to NFSv4 access control lists. These are
* utility routines for code common across file systems implementing NFSv4
* ACLs.
*/
#ifdef _KERNEL
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/priv.h>
#include <sys/vnode.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/acl.h>
#else
#include <errno.h>
#include <assert.h>
#include <sys/acl.h>
#include <sys/stat.h>
#define KASSERT(a, b) assert(a)
#define CTASSERT(a)
void acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode);
#endif /* !_KERNEL */
static int acl_nfs4_old_semantics = 1;
#ifdef _KERNEL
SYSCTL_INT(_vfs, OID_AUTO, acl_nfs4_old_semantics, CTLFLAG_RW,
&acl_nfs4_old_semantics, 1, "Use pre-PSARC/2010/029 NFSv4 ACL semantics");
static struct {
accmode_t accmode;
int mask;
} accmode2mask[] = {{VREAD, ACL_READ_DATA},
{VWRITE, ACL_WRITE_DATA},
{VAPPEND, ACL_APPEND_DATA},
{VEXEC, ACL_EXECUTE},
{VREAD_NAMED_ATTRS, ACL_READ_NAMED_ATTRS},
{VWRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS},
{VDELETE_CHILD, ACL_DELETE_CHILD},
{VREAD_ATTRIBUTES, ACL_READ_ATTRIBUTES},
{VWRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES},
{VDELETE, ACL_DELETE},
{VREAD_ACL, ACL_READ_ACL},
{VWRITE_ACL, ACL_WRITE_ACL},
{VWRITE_OWNER, ACL_WRITE_OWNER},
{VSYNCHRONIZE, ACL_SYNCHRONIZE},
{0, 0}};
static int
_access_mask_from_accmode(accmode_t accmode)
{
int access_mask = 0, i;
for (i = 0; accmode2mask[i].accmode != 0; i++) {
if (accmode & accmode2mask[i].accmode)
access_mask |= accmode2mask[i].mask;
}
/*
* VAPPEND is just a modifier for VWRITE; if the caller asked
* for 'VAPPEND | VWRITE', we want to check for ACL_APPEND_DATA only.
*/
if (access_mask & ACL_APPEND_DATA)
access_mask &= ~ACL_WRITE_DATA;
return (access_mask);
}
/*
* Return 0, iff access is allowed, 1 otherwise.
*/
static int
_acl_denies(const struct acl *aclp, int access_mask, struct ucred *cred,
int file_uid, int file_gid, int *denied_explicitly)
{
int i;
const struct acl_entry *entry;
if (denied_explicitly != NULL)
*denied_explicitly = 0;
KASSERT(aclp->acl_cnt > 0, ("aclp->acl_cnt > 0"));
KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES,
("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
for (i = 0; i < aclp->acl_cnt; i++) {
entry = &(aclp->acl_entry[i]);
if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
continue;
if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY)
continue;
switch (entry->ae_tag) {
case ACL_USER_OBJ:
if (file_uid != cred->cr_uid)
continue;
break;
case ACL_USER:
if (entry->ae_id != cred->cr_uid)
continue;
break;
case ACL_GROUP_OBJ:
if (!groupmember(file_gid, cred))
continue;
break;
case ACL_GROUP:
if (!groupmember(entry->ae_id, cred))
continue;
break;
default:
KASSERT(entry->ae_tag == ACL_EVERYONE,
("entry->ae_tag == ACL_EVERYONE"));
}
if (entry->ae_entry_type == ACL_ENTRY_TYPE_DENY) {
if (entry->ae_perm & access_mask) {
if (denied_explicitly != NULL)
*denied_explicitly = 1;
return (1);
}
}
access_mask &= ~(entry->ae_perm);
if (access_mask == 0)
return (0);
}
return (1);
}
int
vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid,
struct acl *aclp, accmode_t accmode, struct ucred *cred, int *privused)
{
accmode_t priv_granted = 0;
int denied, explicitly_denied, access_mask, is_directory,
must_be_owner = 0;
mode_t file_mode = 0;
KASSERT((accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | VAPPEND |
VEXPLICIT_DENY | VREAD_NAMED_ATTRS | VWRITE_NAMED_ATTRS |
VDELETE_CHILD | VREAD_ATTRIBUTES | VWRITE_ATTRIBUTES | VDELETE |
VREAD_ACL | VWRITE_ACL | VWRITE_OWNER | VSYNCHRONIZE)) == 0,
("invalid bit in accmode"));
KASSERT((accmode & VAPPEND) == 0 || (accmode & VWRITE),
("VAPPEND without VWRITE"));
if (privused != NULL)
*privused = 0;
if (accmode & VADMIN)
must_be_owner = 1;
/*
* Ignore VSYNCHRONIZE permission.
*/
accmode &= ~VSYNCHRONIZE;
access_mask = _access_mask_from_accmode(accmode);
if (type == VDIR)
is_directory = 1;
else
is_directory = 0;
/*
* File owner is always allowed to read and write the ACL
* and basic attributes. This is to prevent a situation
* where user would change ACL in a way that prevents him
* from undoing the change.
*/
if (file_uid == cred->cr_uid)
access_mask &= ~(ACL_READ_ACL | ACL_WRITE_ACL |
ACL_READ_ATTRIBUTES | ACL_WRITE_ATTRIBUTES);
/*
* Ignore append permission for regular files; use write
* permission instead.
*/
if (!is_directory && (access_mask & ACL_APPEND_DATA)) {
access_mask &= ~ACL_APPEND_DATA;
access_mask |= ACL_WRITE_DATA;
}
denied = _acl_denies(aclp, access_mask, cred, file_uid, file_gid,
&explicitly_denied);
if (must_be_owner) {
if (file_uid != cred->cr_uid)
denied = EPERM;
}
/*
* For VEXEC, ensure that at least one execute bit is set for
* non-directories. We have to check the mode here to stay
* consistent with execve(2). See the test in
* exec_check_permissions().
*/
acl_nfs4_sync_mode_from_acl(&file_mode, aclp);
if (!denied && !is_directory && (accmode & VEXEC) &&
(file_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0)
denied = EACCES;
if (!denied)
return (0);
/*
* Access failed. Iff it was not denied explicitly and
* VEXPLICIT_DENY flag was specified, allow access.
*/
if ((accmode & VEXPLICIT_DENY) && explicitly_denied == 0)
return (0);
accmode &= ~VEXPLICIT_DENY;
/*
* No match. Try to use privileges, if there are any.
*/
if (is_directory) {
if ((accmode & VEXEC) && !priv_check_cred(cred,
PRIV_VFS_LOOKUP, 0))
priv_granted |= VEXEC;
} else {
/*
* Ensure that at least one execute bit is on. Otherwise,
* a privileged user will always succeed, and we don't want
* this to happen unless the file really is executable.
*/
if ((accmode & VEXEC) && (file_mode &
(S_IXUSR | S_IXGRP | S_IXOTH)) != 0 &&
!priv_check_cred(cred, PRIV_VFS_EXEC, 0))
priv_granted |= VEXEC;
}
if ((accmode & VREAD) && !priv_check_cred(cred, PRIV_VFS_READ, 0))
priv_granted |= VREAD;
if ((accmode & (VWRITE | VAPPEND | VDELETE_CHILD)) &&
!priv_check_cred(cred, PRIV_VFS_WRITE, 0))
priv_granted |= (VWRITE | VAPPEND | VDELETE_CHILD);
if ((accmode & VADMIN_PERMS) &&
!priv_check_cred(cred, PRIV_VFS_ADMIN, 0))
priv_granted |= VADMIN_PERMS;
if ((accmode & VSTAT_PERMS) &&
!priv_check_cred(cred, PRIV_VFS_STAT, 0))
priv_granted |= VSTAT_PERMS;
if ((accmode & priv_granted) == accmode) {
if (privused != NULL)
*privused = 1;
return (0);
}
if (accmode & (VADMIN_PERMS | VDELETE_CHILD | VDELETE))
denied = EPERM;
else
denied = EACCES;
return (denied);
}
#endif /* _KERNEL */
static int
_acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm,
acl_entry_type_t entry_type)
{
if (entry->ae_tag != tag)
return (0);
if (entry->ae_id != ACL_UNDEFINED_ID)
return (0);
if (entry->ae_perm != perm)
return (0);
if (entry->ae_entry_type != entry_type)
return (0);
if (entry->ae_flags != 0)
return (0);
return (1);
}
static struct acl_entry *
_acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm,
acl_entry_type_t entry_type)
{
struct acl_entry *entry;
KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
entry = &(aclp->acl_entry[aclp->acl_cnt]);
aclp->acl_cnt++;
entry->ae_tag = tag;
entry->ae_id = ACL_UNDEFINED_ID;
entry->ae_perm = perm;
entry->ae_entry_type = entry_type;
entry->ae_flags = 0;
return (entry);
}
static struct acl_entry *
_acl_duplicate_entry(struct acl *aclp, int entry_index)
{
int i;
KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
for (i = aclp->acl_cnt; i > entry_index; i--)
aclp->acl_entry[i] = aclp->acl_entry[i - 1];
aclp->acl_cnt++;
return (&(aclp->acl_entry[entry_index + 1]));
}
static void
acl_nfs4_sync_acl_from_mode_draft(struct acl *aclp, mode_t mode,
int file_owner_id)
{
int i, meets, must_append;
struct acl_entry *entry, *copy, *previous,
*a1, *a2, *a3, *a4, *a5, *a6;
mode_t amode;
const int READ = 04;
const int WRITE = 02;
const int EXEC = 01;
KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES,
("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
/*
* NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt
*
* 3.16.6.3. Applying a Mode to an Existing ACL
*/
/*
* 1. For each ACE:
*/
for (i = 0; i < aclp->acl_cnt; i++) {
entry = &(aclp->acl_entry[i]);
/*
* 1.1. If the type is neither ALLOW or DENY - skip.
*/
if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
continue;
/*
* 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip.
*/
if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY)
continue;
/*
* 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT
* are set:
*/
if (entry->ae_flags &
(ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) {
/*
* 1.3.1. A copy of the current ACE is made, and placed
* in the ACL immediately following the current
* ACE.
*/
copy = _acl_duplicate_entry(aclp, i);
/*
* 1.3.2. In the first ACE, the flag
* ACL_ENTRY_INHERIT_ONLY is set.
*/
entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
/*
* 1.3.3. In the second ACE, the following flags
* are cleared:
* ACL_ENTRY_FILE_INHERIT,
* ACL_ENTRY_DIRECTORY_INHERIT,
* ACL_ENTRY_NO_PROPAGATE_INHERIT.
*/
copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT |
ACL_ENTRY_DIRECTORY_INHERIT |
ACL_ENTRY_NO_PROPAGATE_INHERIT);
/*
* The algorithm continues on with the second ACE.
*/
i++;
entry = copy;
}
/*
* 1.4. If it's owner@, group@ or everyone@ entry, clear
* ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA
* and ACL_EXECUTE. Continue to the next entry.
*/
if (entry->ae_tag == ACL_USER_OBJ ||
entry->ae_tag == ACL_GROUP_OBJ ||
entry->ae_tag == ACL_EVERYONE) {
entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA |
ACL_APPEND_DATA | ACL_EXECUTE);
continue;
}
/*
* 1.5. Otherwise, if the "who" field did not match one
* of OWNER@, GROUP@, EVERYONE@:
*
* 1.5.1. If the type is ALLOW, check the preceding ACE.
* If it does not meet all of the following criteria:
*/
if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW)
continue;
meets = 0;
if (i > 0) {
meets = 1;
previous = &(aclp->acl_entry[i - 1]);
/*
* 1.5.1.1. The type field is DENY,
*/
if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY)
meets = 0;
/*
* 1.5.1.2. The "who" field is the same as the current
* ACE,
*
* 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP
* is the same as it is in the current ACE,
* and no other flag bits are set,
*/
if (previous->ae_id != entry->ae_id ||
previous->ae_tag != entry->ae_tag)
meets = 0;
if (previous->ae_flags)
meets = 0;
/*
* 1.5.1.4. The mask bits are a subset of the mask bits
* of the current ACE, and are also subset of
* the following: ACL_READ_DATA,
* ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE
*/
if (previous->ae_perm & ~(entry->ae_perm))
meets = 0;
if (previous->ae_perm & ~(ACL_READ_DATA |
ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE))
meets = 0;
}
if (!meets) {
/*
* Then the ACE of type DENY, with a who equal
* to the current ACE, flag bits equal to
* (<current ACE flags> & <ACE_IDENTIFIER_GROUP>)
* and no mask bits, is prepended.
*/
previous = entry;
entry = _acl_duplicate_entry(aclp, i);
/* Adjust counter, as we've just added an entry. */
i++;
previous->ae_tag = entry->ae_tag;
previous->ae_id = entry->ae_id;
previous->ae_flags = entry->ae_flags;
previous->ae_perm = 0;
previous->ae_entry_type = ACL_ENTRY_TYPE_DENY;
}
/*
* 1.5.2. The following modifications are made to the prepended
* ACE. The intent is to mask the following ACE
* to disallow ACL_READ_DATA, ACL_WRITE_DATA,
* ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group
* permissions of the new mode. As a special case,
* if the ACE matches the current owner of the file,
* the owner bits are used, rather than the group bits.
* This is reflected in the algorithm below.
*/
amode = mode >> 3;
/*
* If ACE4_IDENTIFIER_GROUP is not set, and the "who" field
* in ACE matches the owner of the file, we shift amode three
* more bits, in order to have the owner permission bits
* placed in the three low order bits of amode.
*/
if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id)
amode = amode >> 3;
if (entry->ae_perm & ACL_READ_DATA) {
if (amode & READ)
previous->ae_perm &= ~ACL_READ_DATA;
else
previous->ae_perm |= ACL_READ_DATA;
}
if (entry->ae_perm & ACL_WRITE_DATA) {
if (amode & WRITE)
previous->ae_perm &= ~ACL_WRITE_DATA;
else
previous->ae_perm |= ACL_WRITE_DATA;
}
if (entry->ae_perm & ACL_APPEND_DATA) {
if (amode & WRITE)
previous->ae_perm &= ~ACL_APPEND_DATA;
else
previous->ae_perm |= ACL_APPEND_DATA;
}
if (entry->ae_perm & ACL_EXECUTE) {
if (amode & EXEC)
previous->ae_perm &= ~ACL_EXECUTE;
else
previous->ae_perm |= ACL_EXECUTE;
}
/*
* 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags
* of the ALLOW ace:
*
* XXX: This point is not there in the Falkner's draft.
*/
if (entry->ae_tag == ACL_GROUP &&
entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) {
mode_t extramode, ownermode;
extramode = (mode >> 3) & 07;
ownermode = mode >> 6;
extramode &= ~ownermode;
if (extramode) {
if (extramode & READ) {
entry->ae_perm &= ~ACL_READ_DATA;
previous->ae_perm &= ~ACL_READ_DATA;
}
if (extramode & WRITE) {
entry->ae_perm &=
~(ACL_WRITE_DATA | ACL_APPEND_DATA);
previous->ae_perm &=
~(ACL_WRITE_DATA | ACL_APPEND_DATA);
}
if (extramode & EXEC) {
entry->ae_perm &= ~ACL_EXECUTE;
previous->ae_perm &= ~ACL_EXECUTE;
}
}
}
}
/*
* 2. If there at least six ACEs, the final six ACEs are examined.
* If they are not equal to what we want, append six ACEs.
*/
must_append = 0;
if (aclp->acl_cnt < 6) {
must_append = 1;
} else {
a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]);
a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]);
a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]);
a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]);
a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]);
a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]);
if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0,
ACL_ENTRY_TYPE_DENY))
must_append = 1;
if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL |
ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW))
must_append = 1;
if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0,
ACL_ENTRY_TYPE_DENY))
must_append = 1;
if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0,
ACL_ENTRY_TYPE_ALLOW))
must_append = 1;
if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL |
ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY))
must_append = 1;
if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL |
ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS |
ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW))
must_append = 1;
}
if (must_append) {
KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES,
("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY);
a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL |
ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW);
a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY);
a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW);
a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL |
ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY);
a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL |
ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS |
ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW);
KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL &&
a5 != NULL && a6 != NULL, ("couldn't append to ACL."));
}
/*
* 3. The final six ACEs are adjusted according to the incoming mode.
*/
if (mode & S_IRUSR)
a2->ae_perm |= ACL_READ_DATA;
else
a1->ae_perm |= ACL_READ_DATA;
if (mode & S_IWUSR)
a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
else
a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
if (mode & S_IXUSR)
a2->ae_perm |= ACL_EXECUTE;
else
a1->ae_perm |= ACL_EXECUTE;
if (mode & S_IRGRP)
a4->ae_perm |= ACL_READ_DATA;
else
a3->ae_perm |= ACL_READ_DATA;
if (mode & S_IWGRP)
a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
else
a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
if (mode & S_IXGRP)
a4->ae_perm |= ACL_EXECUTE;
else
a3->ae_perm |= ACL_EXECUTE;
if (mode & S_IROTH)
a6->ae_perm |= ACL_READ_DATA;
else
a5->ae_perm |= ACL_READ_DATA;
if (mode & S_IWOTH)
a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
else
a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
if (mode & S_IXOTH)
a6->ae_perm |= ACL_EXECUTE;
else
a5->ae_perm |= ACL_EXECUTE;
}
void
acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode,
int file_owner_id)
{
if (acl_nfs4_old_semantics)
acl_nfs4_sync_acl_from_mode_draft(aclp, mode, file_owner_id);
else
acl_nfs4_trivial_from_mode(aclp, mode);
}
void
acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp)
{
int i;
mode_t old_mode = *_mode, mode = 0, seen = 0;
const struct acl_entry *entry;
KASSERT(aclp->acl_cnt > 0, ("aclp->acl_cnt > 0"));
KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES,
("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
/*
* NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt
*
* 3.16.6.1. Recomputing mode upon SETATTR of ACL
*/
for (i = 0; i < aclp->acl_cnt; i++) {
entry = &(aclp->acl_entry[i]);
if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
continue;
if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY)
continue;
if (entry->ae_tag == ACL_USER_OBJ) {
if ((entry->ae_perm & ACL_READ_DATA) &&
((seen & S_IRUSR) == 0)) {
seen |= S_IRUSR;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IRUSR;
}
if ((entry->ae_perm & ACL_WRITE_DATA) &&
((seen & S_IWUSR) == 0)) {
seen |= S_IWUSR;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IWUSR;
}
if ((entry->ae_perm & ACL_EXECUTE) &&
((seen & S_IXUSR) == 0)) {
seen |= S_IXUSR;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IXUSR;
}
} else if (entry->ae_tag == ACL_GROUP_OBJ) {
if ((entry->ae_perm & ACL_READ_DATA) &&
((seen & S_IRGRP) == 0)) {
seen |= S_IRGRP;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IRGRP;
}
if ((entry->ae_perm & ACL_WRITE_DATA) &&
((seen & S_IWGRP) == 0)) {
seen |= S_IWGRP;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IWGRP;
}
if ((entry->ae_perm & ACL_EXECUTE) &&
((seen & S_IXGRP) == 0)) {
seen |= S_IXGRP;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IXGRP;
}
} else if (entry->ae_tag == ACL_EVERYONE) {
if (entry->ae_perm & ACL_READ_DATA) {
if ((seen & S_IRUSR) == 0) {
seen |= S_IRUSR;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IRUSR;
}
if ((seen & S_IRGRP) == 0) {
seen |= S_IRGRP;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IRGRP;
}
if ((seen & S_IROTH) == 0) {
seen |= S_IROTH;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IROTH;
}
}
if (entry->ae_perm & ACL_WRITE_DATA) {
if ((seen & S_IWUSR) == 0) {
seen |= S_IWUSR;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IWUSR;
}
if ((seen & S_IWGRP) == 0) {
seen |= S_IWGRP;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IWGRP;
}
if ((seen & S_IWOTH) == 0) {
seen |= S_IWOTH;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IWOTH;
}
}
if (entry->ae_perm & ACL_EXECUTE) {
if ((seen & S_IXUSR) == 0) {
seen |= S_IXUSR;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IXUSR;
}
if ((seen & S_IXGRP) == 0) {
seen |= S_IXGRP;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IXGRP;
}
if ((seen & S_IXOTH) == 0) {
seen |= S_IXOTH;
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
mode |= S_IXOTH;
}
}
}
}
*_mode = mode | (old_mode & ACL_PRESERVE_MASK);
}
/*
* Calculate inherited ACL in a manner compatible with NFSv4 Minor Version 1,
* draft-ietf-nfsv4-minorversion1-03.txt.
*/
static void
acl_nfs4_compute_inherited_acl_draft(const struct acl *parent_aclp,
struct acl *child_aclp, mode_t mode, int file_owner_id,
int is_directory)
{
int i, flags;
const struct acl_entry *parent_entry;
struct acl_entry *entry, *copy;
KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0"));
KASSERT(parent_aclp->acl_cnt > 0, ("parent_aclp->acl_cnt > 0"));
KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES,
("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES"));
/*
* NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt
*
* 3.16.6.2. Applying the mode given to CREATE or OPEN
* to an inherited ACL
*/
/*
* 1. Form an ACL that is the concatenation of all inheritable ACEs.
*/
for (i = 0; i < parent_aclp->acl_cnt; i++) {
parent_entry = &(parent_aclp->acl_entry[i]);
flags = parent_entry->ae_flags;
/*
* Entry is not inheritable at all.
*/
if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT |
ACL_ENTRY_FILE_INHERIT)) == 0)
continue;
/*
* We're creating a file, but entry is not inheritable
* by files.
*/
if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0)
continue;
/*
* Entry is inheritable only by files, but has NO_PROPAGATE
* flag set, and we're creating a directory, so it wouldn't
* propagate to any file in that directory anyway.
*/
if (is_directory &&
(flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 &&
(flags & ACL_ENTRY_NO_PROPAGATE_INHERIT))
continue;
KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry;
child_aclp->acl_cnt++;
}
/*
* 2. For each entry in the new ACL, adjust its flags, possibly
* creating two entries in place of one.
*/
for (i = 0; i < child_aclp->acl_cnt; i++) {
entry = &(child_aclp->acl_entry[i]);
/*
* This is not in the specification, but SunOS
* apparently does that.
*/
if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) ||
!is_directory) &&
entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER);
/*
* 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object
* being created is not a directory, then clear the
* following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT,
* ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT,
* ACL_ENTRY_INHERIT_ONLY.
*/
if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT ||
!is_directory) {
entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT |
ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT |
ACL_ENTRY_INHERIT_ONLY);
/*
* Continue on to the next ACE.
*/
continue;
}
/*
* 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT
* is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure
* that ACL_ENTRY_INHERIT_ONLY is set. Continue to the
* next ACE. Otherwise...
*/
/*
* XXX: Read it again and make sure what does the "otherwise"
* apply to.
*/
if (is_directory &&
(entry->ae_flags & ACL_ENTRY_FILE_INHERIT) &&
((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) {
entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
continue;
}
/*
* 2.C. If the type of the ACE is neither ALLOW nor deny,
* then continue.
*/
if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
continue;
/*
* 2.D. Copy the original ACE into a second, adjacent ACE.
*/
copy = _acl_duplicate_entry(child_aclp, i);
/*
* 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY
* is set.
*/
entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
/*
* 2.F. On the second ACE, clear the following flags:
* ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT,
* ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY.
*/
copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT |
ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT |
ACL_ENTRY_INHERIT_ONLY);
/*
* 2.G. On the second ACE, if the type is ALLOW,
* an implementation MAY clear the following
* mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER.
*/
if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER);
/*
* Increment the counter to skip the copied entry.
*/
i++;
}
/*
* 3. To ensure that the mode is honored, apply the algorithm describe
* in Section 2.16.6.3, using the mode that is to be used for file
* creation.
*/
acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id);
}
/*
* Populate the ACL with entries inherited from parent_aclp.
*/
static void
acl_nfs4_inherit_entries(const struct acl *parent_aclp,
struct acl *child_aclp, mode_t mode, int file_owner_id,
int is_directory)
{
int i, flags, tag;
const struct acl_entry *parent_entry;
struct acl_entry *entry;
KASSERT(parent_aclp->acl_cnt > 0, ("parent_aclp->acl_cnt > 0"));
KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES,
("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES"));
for (i = 0; i < parent_aclp->acl_cnt; i++) {
parent_entry = &(parent_aclp->acl_entry[i]);
flags = parent_entry->ae_flags;
tag = parent_entry->ae_tag;
/*
* Don't inherit owner@, group@, or everyone@ entries.
*/
if (tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ ||
tag == ACL_EVERYONE)
continue;
/*
* Entry is not inheritable at all.
*/
if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT |
ACL_ENTRY_FILE_INHERIT)) == 0)
continue;
/*
* We're creating a file, but entry is not inheritable
* by files.
*/
if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0)
continue;
/*
* Entry is inheritable only by files, but has NO_PROPAGATE
* flag set, and we're creating a directory, so it wouldn't
* propagate to any file in that directory anyway.
*/
if (is_directory &&
(flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 &&
(flags & ACL_ENTRY_NO_PROPAGATE_INHERIT))
continue;
/*
* Entry qualifies for being inherited.
*/
KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
entry = &(child_aclp->acl_entry[child_aclp->acl_cnt]);
*entry = *parent_entry;
child_aclp->acl_cnt++;
entry->ae_flags &= ~ACL_ENTRY_INHERIT_ONLY;
/*
* If the type of the ACE is neither ALLOW nor DENY,
* then leave it as it is and proceed to the next one.
*/
if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
continue;
/*
* If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if
* the object being created is not a directory, then clear
* the following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT,
* ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT,
* ACL_ENTRY_INHERIT_ONLY.
*/
if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT ||
!is_directory) {
entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT |
ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT |
ACL_ENTRY_INHERIT_ONLY);
}
/*
* If the object is a directory and ACL_ENTRY_FILE_INHERIT
* is set, but ACL_ENTRY_DIRECTORY_INHERIT is not set, ensure
* that ACL_ENTRY_INHERIT_ONLY is set.
*/
if (is_directory &&
(entry->ae_flags & ACL_ENTRY_FILE_INHERIT) &&
((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) {
entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
}
if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW &&
(entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) == 0) {
/*
* Some permissions must never be inherited.
*/
entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER |
ACL_WRITE_NAMED_ATTRS | ACL_WRITE_ATTRIBUTES);
/*
* Others must be masked according to the file mode.
*/
if ((mode & S_IRGRP) == 0)
entry->ae_perm &= ~ACL_READ_DATA;
if ((mode & S_IWGRP) == 0)
entry->ae_perm &=
~(ACL_WRITE_DATA | ACL_APPEND_DATA);
if ((mode & S_IXGRP) == 0)
entry->ae_perm &= ~ACL_EXECUTE;
}
}
}
/*
* Calculate inherited ACL in a manner compatible with PSARC/2010/029.
* It's also being used to calculate a trivial ACL, by inheriting from
* a NULL ACL.
*/
static void
acl_nfs4_compute_inherited_acl_psarc(const struct acl *parent_aclp,
struct acl *aclp, mode_t mode, int file_owner_id, int is_directory)
{
acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0;
acl_perm_t user_allow, group_allow, everyone_allow;
KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0"));
user_allow = group_allow = everyone_allow = ACL_READ_ACL |
ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE;
user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
ACL_WRITE_NAMED_ATTRS;
if (mode & S_IRUSR)
user_allow |= ACL_READ_DATA;
if (mode & S_IWUSR)
user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
if (mode & S_IXUSR)
user_allow |= ACL_EXECUTE;
if (mode & S_IRGRP)
group_allow |= ACL_READ_DATA;
if (mode & S_IWGRP)
group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
if (mode & S_IXGRP)
group_allow |= ACL_EXECUTE;
if (mode & S_IROTH)
everyone_allow |= ACL_READ_DATA;
if (mode & S_IWOTH)
everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
if (mode & S_IXOTH)
everyone_allow |= ACL_EXECUTE;
user_deny = ((group_allow | everyone_allow) & ~user_allow);
group_deny = everyone_allow & ~group_allow;
user_allow_first = group_deny & ~user_deny;
if (user_allow_first != 0)
_acl_append(aclp, ACL_USER_OBJ, user_allow_first,
ACL_ENTRY_TYPE_ALLOW);
if (user_deny != 0)
_acl_append(aclp, ACL_USER_OBJ, user_deny,
ACL_ENTRY_TYPE_DENY);
if (group_deny != 0)
_acl_append(aclp, ACL_GROUP_OBJ, group_deny,
ACL_ENTRY_TYPE_DENY);
if (parent_aclp != NULL)
acl_nfs4_inherit_entries(parent_aclp, aclp, mode,
file_owner_id, is_directory);
_acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW);
_acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW);
_acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW);
}
void
acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp,
struct acl *child_aclp, mode_t mode, int file_owner_id,
int is_directory)
{
if (acl_nfs4_old_semantics)
acl_nfs4_compute_inherited_acl_draft(parent_aclp, child_aclp,
mode, file_owner_id, is_directory);
else
acl_nfs4_compute_inherited_acl_psarc(parent_aclp, child_aclp,
mode, file_owner_id, is_directory);
}
/*
* Calculate trivial ACL in a manner compatible with PSARC/2010/029.
* Note that this results in an ACL different from (but semantically
* equal to) the "canonical six" trivial ACL computed using algorithm
* described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2.
*
* This routine is not static only because the code is being used in libc.
* Kernel code should call acl_nfs4_sync_acl_from_mode() instead.
*/
void
acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode)
{
aclp->acl_cnt = 0;
acl_nfs4_compute_inherited_acl_psarc(NULL, aclp, mode, -1, -1);
}
#ifdef _KERNEL
static int
_acls_are_equal(const struct acl *a, const struct acl *b)
{
int i;
const struct acl_entry *entrya, *entryb;
if (a->acl_cnt != b->acl_cnt)
return (0);
for (i = 0; i < b->acl_cnt; i++) {
entrya = &(a->acl_entry[i]);
entryb = &(b->acl_entry[i]);
if (entrya->ae_tag != entryb->ae_tag ||
entrya->ae_id != entryb->ae_id ||
entrya->ae_perm != entryb->ae_perm ||
entrya->ae_entry_type != entryb->ae_entry_type ||
entrya->ae_flags != entryb->ae_flags)
return (0);
}
return (1);
}
/*
* This routine is used to determine whether to remove extended attribute
* that stores ACL contents.
*/
int
acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id)
{
int trivial;
mode_t tmpmode = 0;
struct acl *tmpaclp;
if (aclp->acl_cnt > 6)
return (0);
/*
* Compute the mode from the ACL, then compute new ACL from that mode.
* If the ACLs are identical, then the ACL is trivial.
*
* XXX: I guess there is a faster way to do this. However, even
* this slow implementation significantly speeds things up
* for files that don't have non-trivial ACLs - it's critical
* for performance to not use EA when they are not needed.
*
* First try the PSARC/2010/029 semantics.
*/
tmpaclp = acl_alloc(M_WAITOK | M_ZERO);
acl_nfs4_sync_mode_from_acl(&tmpmode, aclp);
acl_nfs4_trivial_from_mode(tmpaclp, tmpmode);
trivial = _acls_are_equal(aclp, tmpaclp);
if (trivial) {
acl_free(tmpaclp);
return (trivial);
}
/*
* Check if it's a draft-ietf-nfsv4-minorversion1-03.txt trivial ACL.
*/
tmpaclp->acl_cnt = 0;
acl_nfs4_sync_acl_from_mode_draft(tmpaclp, tmpmode, file_owner_id);
trivial = _acls_are_equal(aclp, tmpaclp);
acl_free(tmpaclp);
return (trivial);
}
#endif /* _KERNEL */
int
acl_nfs4_check(const struct acl *aclp, int is_directory)
{
int i;
const struct acl_entry *entry;
/*
* The spec doesn't seem to say anything about ACL validity.
* It seems there is not much to do here. There is even no need
* to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE)
* entries, as there can be several of them and that's perfectly
* valid. There can be none of them too. Really.
*/
if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0)
return (EINVAL);
for (i = 0; i < aclp->acl_cnt; i++) {
entry = &(aclp->acl_entry[i]);
switch (entry->ae_tag) {
case ACL_USER_OBJ:
case ACL_GROUP_OBJ:
case ACL_EVERYONE:
if (entry->ae_id != ACL_UNDEFINED_ID)
return (EINVAL);
break;
case ACL_USER:
case ACL_GROUP:
if (entry->ae_id == ACL_UNDEFINED_ID)
return (EINVAL);
break;
default:
return (EINVAL);
}
if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS)
return (EINVAL);
/*
* Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now.
*/
if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
return (EINVAL);
if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS)
return (EINVAL);
/* Disallow unimplemented flags. */
if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS |
ACL_ENTRY_FAILED_ACCESS))
return (EINVAL);
/* Disallow flags not allowed for ordinary files. */
if (!is_directory) {
if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT |
ACL_ENTRY_DIRECTORY_INHERIT |
ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY))
return (EINVAL);
}
}
return (0);
}
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