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zfs-builds-mm/zfs-2.0.0-rc4/module/os/freebsd/spl/acl_common.c

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add_zfs_2.0.0-rc4
2020-10-22 14:20:35 +02:00
/*
* 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.
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/avl.h>
#include <sys/misc.h>
#if defined(_KERNEL)
#include <sys/kmem.h>
#include <sys/systm.h>
#include <sys/sysmacros.h>
#include <acl/acl_common.h>
#include <sys/debug.h>
#else
#include <errno.h>
#include <stdlib.h>
#include <stddef.h>
#include <strings.h>
#include <unistd.h>
#include <assert.h>
#include <grp.h>
#include <pwd.h>
#include <acl_common.h>
#define ASSERT assert
#endif
#define ACE_POSIX_SUPPORTED_BITS (ACE_READ_DATA | \
ACE_WRITE_DATA | ACE_APPEND_DATA | ACE_EXECUTE | \
ACE_READ_ATTRIBUTES | ACE_READ_ACL | ACE_WRITE_ACL)
#define ACL_SYNCHRONIZE_SET_DENY 0x0000001
#define ACL_SYNCHRONIZE_SET_ALLOW 0x0000002
#define ACL_SYNCHRONIZE_ERR_DENY 0x0000004
#define ACL_SYNCHRONIZE_ERR_ALLOW 0x0000008
#define ACL_WRITE_OWNER_SET_DENY 0x0000010
#define ACL_WRITE_OWNER_SET_ALLOW 0x0000020
#define ACL_WRITE_OWNER_ERR_DENY 0x0000040
#define ACL_WRITE_OWNER_ERR_ALLOW 0x0000080
#define ACL_DELETE_SET_DENY 0x0000100
#define ACL_DELETE_SET_ALLOW 0x0000200
#define ACL_DELETE_ERR_DENY 0x0000400
#define ACL_DELETE_ERR_ALLOW 0x0000800
#define ACL_WRITE_ATTRS_OWNER_SET_DENY 0x0001000
#define ACL_WRITE_ATTRS_OWNER_SET_ALLOW 0x0002000
#define ACL_WRITE_ATTRS_OWNER_ERR_DENY 0x0004000
#define ACL_WRITE_ATTRS_OWNER_ERR_ALLOW 0x0008000
#define ACL_WRITE_ATTRS_WRITER_SET_DENY 0x0010000
#define ACL_WRITE_ATTRS_WRITER_SET_ALLOW 0x0020000
#define ACL_WRITE_ATTRS_WRITER_ERR_DENY 0x0040000
#define ACL_WRITE_ATTRS_WRITER_ERR_ALLOW 0x0080000
#define ACL_WRITE_NAMED_WRITER_SET_DENY 0x0100000
#define ACL_WRITE_NAMED_WRITER_SET_ALLOW 0x0200000
#define ACL_WRITE_NAMED_WRITER_ERR_DENY 0x0400000
#define ACL_WRITE_NAMED_WRITER_ERR_ALLOW 0x0800000
#define ACL_READ_NAMED_READER_SET_DENY 0x1000000
#define ACL_READ_NAMED_READER_SET_ALLOW 0x2000000
#define ACL_READ_NAMED_READER_ERR_DENY 0x4000000
#define ACL_READ_NAMED_READER_ERR_ALLOW 0x8000000
#define ACE_VALID_MASK_BITS (\
ACE_READ_DATA | \
ACE_LIST_DIRECTORY | \
ACE_WRITE_DATA | \
ACE_ADD_FILE | \
ACE_APPEND_DATA | \
ACE_ADD_SUBDIRECTORY | \
ACE_READ_NAMED_ATTRS | \
ACE_WRITE_NAMED_ATTRS | \
ACE_EXECUTE | \
ACE_DELETE_CHILD | \
ACE_READ_ATTRIBUTES | \
ACE_WRITE_ATTRIBUTES | \
ACE_DELETE | \
ACE_READ_ACL | \
ACE_WRITE_ACL | \
ACE_WRITE_OWNER | \
ACE_SYNCHRONIZE)
#define ACE_MASK_UNDEFINED 0x80000000
#define ACE_VALID_FLAG_BITS (ACE_FILE_INHERIT_ACE | \
ACE_DIRECTORY_INHERIT_ACE | \
ACE_NO_PROPAGATE_INHERIT_ACE | ACE_INHERIT_ONLY_ACE | \
ACE_SUCCESSFUL_ACCESS_ACE_FLAG | ACE_FAILED_ACCESS_ACE_FLAG | \
ACE_IDENTIFIER_GROUP | ACE_OWNER | ACE_GROUP | ACE_EVERYONE)
/*
* ACL conversion helpers
*/
typedef enum {
ace_unused,
ace_user_obj,
ace_user,
ace_group, /* includes GROUP and GROUP_OBJ */
ace_other_obj
} ace_to_aent_state_t;
typedef struct acevals {
uid_t key;
avl_node_t avl;
uint32_t mask;
uint32_t allowed;
uint32_t denied;
int aent_type;
} acevals_t;
typedef struct ace_list {
acevals_t user_obj;
avl_tree_t user;
int numusers;
acevals_t group_obj;
avl_tree_t group;
int numgroups;
acevals_t other_obj;
uint32_t acl_mask;
int hasmask;
int dfacl_flag;
ace_to_aent_state_t state;
int seen; /* bitmask of all aclent_t a_type values seen */
} ace_list_t;
/*
* Generic shellsort, from K&R (1st ed, p 58.), somewhat modified.
* v = Ptr to array/vector of objs
* n = # objs in the array
* s = size of each obj (must be multiples of a word size)
* f = ptr to function to compare two objs
* returns (-1 = less than, 0 = equal, 1 = greater than
*/
void
ksort(caddr_t v, int n, int s, int (*f)(void *, void *))
{
int g, i, j, ii;
unsigned int *p1, *p2;
unsigned int tmp;
/* No work to do */
if (v == NULL || n <= 1)
return;
/* Sanity check on arguments */
ASSERT(((uintptr_t)v & 0x3) == 0 && (s & 0x3) == 0);
ASSERT(s > 0);
for (g = n / 2; g > 0; g /= 2) {
for (i = g; i < n; i++) {
for (j = i - g; j >= 0 &&
(*f)(v + j * s, v + (j + g) * s) == 1;
j -= g) {
p1 = (void *)(v + j * s);
p2 = (void *)(v + (j + g) * s);
for (ii = 0; ii < s / 4; ii++) {
tmp = *p1;
*p1++ = *p2;
*p2++ = tmp;
}
}
}
}
}
/*
* Compare two acls, all fields. Returns:
* -1 (less than)
* 0 (equal)
* +1 (greater than)
*/
int
cmp2acls(void *a, void *b)
{
aclent_t *x = (aclent_t *)a;
aclent_t *y = (aclent_t *)b;
/* Compare types */
if (x->a_type < y->a_type)
return (-1);
if (x->a_type > y->a_type)
return (1);
/* Equal types; compare id's */
if (x->a_id < y->a_id)
return (-1);
if (x->a_id > y->a_id)
return (1);
/* Equal ids; compare perms */
if (x->a_perm < y->a_perm)
return (-1);
if (x->a_perm > y->a_perm)
return (1);
/* Totally equal */
return (0);
}
static int
cacl_malloc(void **ptr, size_t size)
{
*ptr = kmem_zalloc(size, KM_SLEEP);
return (0);
}
#if !defined(_KERNEL)
acl_t *
acl_alloc(enum acl_type type)
{
acl_t *aclp;
if (cacl_malloc((void **)&aclp, sizeof (acl_t)) != 0)
return (NULL);
aclp->acl_aclp = NULL;
aclp->acl_cnt = 0;
switch (type) {
case ACE_T:
aclp->acl_type = ACE_T;
aclp->acl_entry_size = sizeof (ace_t);
break;
case ACLENT_T:
aclp->acl_type = ACLENT_T;
aclp->acl_entry_size = sizeof (aclent_t);
break;
default:
acl_free(aclp);
aclp = NULL;
}
return (aclp);
}
/*
* Free acl_t structure
*/
void
acl_free(acl_t *aclp)
{
int acl_size;
if (aclp == NULL)
return;
if (aclp->acl_aclp) {
acl_size = aclp->acl_cnt * aclp->acl_entry_size;
cacl_free(aclp->acl_aclp, acl_size);
}
cacl_free(aclp, sizeof (acl_t));
}
static uint32_t
access_mask_set(int haswriteperm, int hasreadperm, int isowner, int isallow)
{
uint32_t access_mask = 0;
int acl_produce;
int synchronize_set = 0, write_owner_set = 0;
int delete_set = 0, write_attrs_set = 0;
int read_named_set = 0, write_named_set = 0;
acl_produce = (ACL_SYNCHRONIZE_SET_ALLOW |
ACL_WRITE_ATTRS_OWNER_SET_ALLOW |
ACL_WRITE_ATTRS_WRITER_SET_DENY);
if (isallow) {
synchronize_set = ACL_SYNCHRONIZE_SET_ALLOW;
write_owner_set = ACL_WRITE_OWNER_SET_ALLOW;
delete_set = ACL_DELETE_SET_ALLOW;
if (hasreadperm)
read_named_set = ACL_READ_NAMED_READER_SET_ALLOW;
if (haswriteperm)
write_named_set = ACL_WRITE_NAMED_WRITER_SET_ALLOW;
if (isowner)
write_attrs_set = ACL_WRITE_ATTRS_OWNER_SET_ALLOW;
else if (haswriteperm)
write_attrs_set = ACL_WRITE_ATTRS_WRITER_SET_ALLOW;
} else {
synchronize_set = ACL_SYNCHRONIZE_SET_DENY;
write_owner_set = ACL_WRITE_OWNER_SET_DENY;
delete_set = ACL_DELETE_SET_DENY;
if (hasreadperm)
read_named_set = ACL_READ_NAMED_READER_SET_DENY;
if (haswriteperm)
write_named_set = ACL_WRITE_NAMED_WRITER_SET_DENY;
if (isowner)
write_attrs_set = ACL_WRITE_ATTRS_OWNER_SET_DENY;
else if (haswriteperm)
write_attrs_set = ACL_WRITE_ATTRS_WRITER_SET_DENY;
else
/*
* If the entity is not the owner and does not
* have write permissions ACE_WRITE_ATTRIBUTES will
* always go in the DENY ACE.
*/
access_mask |= ACE_WRITE_ATTRIBUTES;
}
if (acl_produce & synchronize_set)
access_mask |= ACE_SYNCHRONIZE;
if (acl_produce & write_owner_set)
access_mask |= ACE_WRITE_OWNER;
if (acl_produce & delete_set)
access_mask |= ACE_DELETE;
if (acl_produce & write_attrs_set)
access_mask |= ACE_WRITE_ATTRIBUTES;
if (acl_produce & read_named_set)
access_mask |= ACE_READ_NAMED_ATTRS;
if (acl_produce & write_named_set)
access_mask |= ACE_WRITE_NAMED_ATTRS;
return (access_mask);
}
/*
* Given an mode_t, convert it into an access_mask as used
* by nfsace, assuming aclent_t -> nfsace semantics.
*/
static uint32_t
mode_to_ace_access(mode_t mode, boolean_t isdir, int isowner, int isallow)
{
uint32_t access = 0;
int haswriteperm = 0;
int hasreadperm = 0;
if (isallow) {
haswriteperm = (mode & S_IWOTH);
hasreadperm = (mode & S_IROTH);
} else {
haswriteperm = !(mode & S_IWOTH);
hasreadperm = !(mode & S_IROTH);
}
/*
* The following call takes care of correctly setting the following
* mask bits in the access_mask:
* ACE_SYNCHRONIZE, ACE_WRITE_OWNER, ACE_DELETE,
* ACE_WRITE_ATTRIBUTES, ACE_WRITE_NAMED_ATTRS, ACE_READ_NAMED_ATTRS
*/
access = access_mask_set(haswriteperm, hasreadperm, isowner, isallow);
if (isallow) {
access |= ACE_READ_ACL | ACE_READ_ATTRIBUTES;
if (isowner)
access |= ACE_WRITE_ACL;
} else {
if (! isowner)
access |= ACE_WRITE_ACL;
}
/* read */
if (mode & S_IROTH) {
access |= ACE_READ_DATA;
}
/* write */
if (mode & S_IWOTH) {
access |= ACE_WRITE_DATA |
ACE_APPEND_DATA;
if (isdir)
access |= ACE_DELETE_CHILD;
}
/* exec */
if (mode & S_IXOTH) {
access |= ACE_EXECUTE;
}
return (access);
}
/*
* Given an nfsace (presumably an ALLOW entry), make a
* corresponding DENY entry at the address given.
*/
static void
ace_make_deny(ace_t *allow, ace_t *deny, int isdir, int isowner)
{
(void) memcpy(deny, allow, sizeof (ace_t));
deny->a_who = allow->a_who;
deny->a_type = ACE_ACCESS_DENIED_ACE_TYPE;
deny->a_access_mask ^= ACE_POSIX_SUPPORTED_BITS;
if (isdir)
deny->a_access_mask ^= ACE_DELETE_CHILD;
deny->a_access_mask &= ~(ACE_SYNCHRONIZE | ACE_WRITE_OWNER |
ACE_DELETE | ACE_WRITE_ATTRIBUTES | ACE_READ_NAMED_ATTRS |
ACE_WRITE_NAMED_ATTRS);
deny->a_access_mask |= access_mask_set((allow->a_access_mask &
ACE_WRITE_DATA), (allow->a_access_mask & ACE_READ_DATA), isowner,
B_FALSE);
}
/*
* Make an initial pass over an array of aclent_t's. Gather
* information such as an ACL_MASK (if any), number of users,
* number of groups, and whether the array needs to be sorted.
*/
static int
ln_aent_preprocess(aclent_t *aclent, int n,
int *hasmask, mode_t *mask,
int *numuser, int *numgroup, int *needsort)
{
int error = 0;
int i;
int curtype = 0;
*hasmask = 0;
*mask = 07;
*needsort = 0;
*numuser = 0;
*numgroup = 0;
for (i = 0; i < n; i++) {
if (aclent[i].a_type < curtype)
*needsort = 1;
else if (aclent[i].a_type > curtype)
curtype = aclent[i].a_type;
if (aclent[i].a_type & USER)
(*numuser)++;
if (aclent[i].a_type & (GROUP | GROUP_OBJ))
(*numgroup)++;
if (aclent[i].a_type & CLASS_OBJ) {
if (*hasmask) {
error = EINVAL;
goto out;
} else {
*hasmask = 1;
*mask = aclent[i].a_perm;
}
}
}
if ((! *hasmask) && (*numuser + *numgroup > 1)) {
error = EINVAL;
goto out;
}
out:
return (error);
}
/*
* Convert an array of aclent_t into an array of nfsace entries,
* following POSIX draft -> nfsv4 conversion semantics as outlined in
* the IETF draft.
*/
static int
ln_aent_to_ace(aclent_t *aclent, int n, ace_t **acepp, int *rescount, int isdir)
{
int error = 0;
mode_t mask;
int numuser, numgroup, needsort;
int resultsize = 0;
int i, groupi = 0, skip;
ace_t *acep, *result = NULL;
int hasmask;
error = ln_aent_preprocess(aclent, n, &hasmask, &mask,
&numuser, &numgroup, &needsort);
if (error != 0)
goto out;
/* allow + deny for each aclent */
resultsize = n * 2;
if (hasmask) {
/*
* stick extra deny on the group_obj and on each
* user|group for the mask (the group_obj was added
* into the count for numgroup)
*/
resultsize += numuser + numgroup;
/* ... and don't count the mask itself */
resultsize -= 2;
}
/* sort the source if necessary */
if (needsort)
ksort((caddr_t)aclent, n, sizeof (aclent_t), cmp2acls);
if (cacl_malloc((void **)&result, resultsize * sizeof (ace_t)) != 0)
goto out;
acep = result;
for (i = 0; i < n; i++) {
/*
* don't process CLASS_OBJ (mask); mask was grabbed in
* ln_aent_preprocess()
*/
if (aclent[i].a_type & CLASS_OBJ)
continue;
/* If we need an ACL_MASK emulator, prepend it now */
if ((hasmask) &&
(aclent[i].a_type & (USER | GROUP | GROUP_OBJ))) {
acep->a_type = ACE_ACCESS_DENIED_ACE_TYPE;
acep->a_flags = 0;
if (aclent[i].a_type & GROUP_OBJ) {
acep->a_who = (uid_t)-1;
acep->a_flags |=
(ACE_IDENTIFIER_GROUP|ACE_GROUP);
} else if (aclent[i].a_type & USER) {
acep->a_who = aclent[i].a_id;
} else {
acep->a_who = aclent[i].a_id;
acep->a_flags |= ACE_IDENTIFIER_GROUP;
}
if (aclent[i].a_type & ACL_DEFAULT) {
acep->a_flags |= ACE_INHERIT_ONLY_ACE |
ACE_FILE_INHERIT_ACE |
ACE_DIRECTORY_INHERIT_ACE;
}
/*
* Set the access mask for the prepended deny
* ace. To do this, we invert the mask (found
* in ln_aent_preprocess()) then convert it to an
* DENY ace access_mask.
*/
acep->a_access_mask = mode_to_ace_access((mask ^ 07),
isdir, 0, 0);
acep += 1;
}
/* handle a_perm -> access_mask */
acep->a_access_mask = mode_to_ace_access(aclent[i].a_perm,
isdir, aclent[i].a_type & USER_OBJ, 1);
/* emulate a default aclent */
if (aclent[i].a_type & ACL_DEFAULT) {
acep->a_flags |= ACE_INHERIT_ONLY_ACE |
ACE_FILE_INHERIT_ACE |
ACE_DIRECTORY_INHERIT_ACE;
}
/*
* handle a_perm and a_id
*
* this must be done last, since it involves the
* corresponding deny aces, which are handled
* differently for each different a_type.
*/
if (aclent[i].a_type & USER_OBJ) {
acep->a_who = (uid_t)-1;
acep->a_flags |= ACE_OWNER;
ace_make_deny(acep, acep + 1, isdir, B_TRUE);
acep += 2;
} else if (aclent[i].a_type & USER) {
acep->a_who = aclent[i].a_id;
ace_make_deny(acep, acep + 1, isdir, B_FALSE);
acep += 2;
} else if (aclent[i].a_type & (GROUP_OBJ | GROUP)) {
if (aclent[i].a_type & GROUP_OBJ) {
acep->a_who = (uid_t)-1;
acep->a_flags |= ACE_GROUP;
} else {
acep->a_who = aclent[i].a_id;
}
acep->a_flags |= ACE_IDENTIFIER_GROUP;
/*
* Set the corresponding deny for the group ace.
*
* The deny aces go after all of the groups, unlike
* everything else, where they immediately follow
* the allow ace.
*
* We calculate "skip", the number of slots to
* skip ahead for the deny ace, here.
*
* The pattern is:
* MD1 A1 MD2 A2 MD3 A3 D1 D2 D3
* thus, skip is
* (2 * numgroup) - 1 - groupi
* (2 * numgroup) to account for MD + A
* - 1 to account for the fact that we're on the
* access (A), not the mask (MD)
* - groupi to account for the fact that we have
* passed up groupi number of MD's.
*/
skip = (2 * numgroup) - 1 - groupi;
ace_make_deny(acep, acep + skip, isdir, B_FALSE);
/*
* If we just did the last group, skip acep past
* all of the denies; else, just move ahead one.
*/
if (++groupi >= numgroup)
acep += numgroup + 1;
else
acep += 1;
} else if (aclent[i].a_type & OTHER_OBJ) {
acep->a_who = (uid_t)-1;
acep->a_flags |= ACE_EVERYONE;
ace_make_deny(acep, acep + 1, isdir, B_FALSE);
acep += 2;
} else {
error = EINVAL;
goto out;
}
}
*acepp = result;
*rescount = resultsize;
out:
if (error != 0) {
if ((result != NULL) && (resultsize > 0)) {
cacl_free(result, resultsize * sizeof (ace_t));
}
}
return (error);
}
static int
convert_aent_to_ace(aclent_t *aclentp, int aclcnt, boolean_t isdir,
ace_t **retacep, int *retacecnt)
{
ace_t *acep;
ace_t *dfacep;
int acecnt = 0;
int dfacecnt = 0;
int dfaclstart = 0;
int dfaclcnt = 0;
aclent_t *aclp;
int i;
int error;
int acesz, dfacesz;
ksort((caddr_t)aclentp, aclcnt, sizeof (aclent_t), cmp2acls);
for (i = 0, aclp = aclentp; i < aclcnt; aclp++, i++) {
if (aclp->a_type & ACL_DEFAULT)
break;
}
if (i < aclcnt) {
dfaclstart = i;
dfaclcnt = aclcnt - i;
}
if (dfaclcnt && !isdir) {
return (EINVAL);
}
error = ln_aent_to_ace(aclentp, i, &acep, &acecnt, isdir);
if (error)
return (error);
if (dfaclcnt) {
error = ln_aent_to_ace(&aclentp[dfaclstart], dfaclcnt,
&dfacep, &dfacecnt, isdir);
if (error) {
if (acep) {
cacl_free(acep, acecnt * sizeof (ace_t));
}
return (error);
}
}
if (dfacecnt != 0) {
acesz = sizeof (ace_t) * acecnt;
dfacesz = sizeof (ace_t) * dfacecnt;
acep = cacl_realloc(acep, acesz, acesz + dfacesz);
if (acep == NULL)
return (ENOMEM);
if (dfaclcnt) {
(void) memcpy(acep + acecnt, dfacep, dfacesz);
}
}
if (dfaclcnt)
cacl_free(dfacep, dfacecnt * sizeof (ace_t));
*retacecnt = acecnt + dfacecnt;
*retacep = acep;
return (0);
}
static int
ace_mask_to_mode(uint32_t mask, o_mode_t *modep, boolean_t isdir)
{
int error = 0;
o_mode_t mode = 0;
uint32_t bits, wantbits;
/* read */
if (mask & ACE_READ_DATA)
mode |= S_IROTH;
/* write */
wantbits = (ACE_WRITE_DATA | ACE_APPEND_DATA);
if (isdir)
wantbits |= ACE_DELETE_CHILD;
bits = mask & wantbits;
if (bits != 0) {
if (bits != wantbits) {
error = ENOTSUP;
goto out;
}
mode |= S_IWOTH;
}
/* exec */
if (mask & ACE_EXECUTE) {
mode |= S_IXOTH;
}
*modep = mode;
out:
return (error);
}
static void
acevals_init(acevals_t *vals, uid_t key)
{
bzero(vals, sizeof (*vals));
vals->allowed = ACE_MASK_UNDEFINED;
vals->denied = ACE_MASK_UNDEFINED;
vals->mask = ACE_MASK_UNDEFINED;
vals->key = key;
}
static void
ace_list_init(ace_list_t *al, int dfacl_flag)
{
acevals_init(&al->user_obj, 0);
acevals_init(&al->group_obj, 0);
acevals_init(&al->other_obj, 0);
al->numusers = 0;
al->numgroups = 0;
al->acl_mask = 0;
al->hasmask = 0;
al->state = ace_unused;
al->seen = 0;
al->dfacl_flag = dfacl_flag;
}
/*
* Find or create an acevals holder for a given id and avl tree.
*
* Note that only one thread will ever touch these avl trees, so
* there is no need for locking.
*/
static acevals_t *
acevals_find(ace_t *ace, avl_tree_t *avl, int *num)
{
acevals_t key, *rc;
avl_index_t where;
key.key = ace->a_who;
rc = avl_find(avl, &key, &where);
if (rc != NULL)
return (rc);
/* this memory is freed by ln_ace_to_aent()->ace_list_free() */
if (cacl_malloc((void **)&rc, sizeof (acevals_t)) != 0)
return (NULL);
acevals_init(rc, ace->a_who);
avl_insert(avl, rc, where);
(*num)++;
return (rc);
}
static int
access_mask_check(ace_t *acep, int mask_bit, int isowner)
{
int set_deny, err_deny;
int set_allow, err_allow;
int acl_consume;
int haswriteperm, hasreadperm;
if (acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) {
haswriteperm = (acep->a_access_mask & ACE_WRITE_DATA) ? 0 : 1;
hasreadperm = (acep->a_access_mask & ACE_READ_DATA) ? 0 : 1;
} else {
haswriteperm = (acep->a_access_mask & ACE_WRITE_DATA) ? 1 : 0;
hasreadperm = (acep->a_access_mask & ACE_READ_DATA) ? 1 : 0;
}
acl_consume = (ACL_SYNCHRONIZE_ERR_DENY |
ACL_DELETE_ERR_DENY |
ACL_WRITE_OWNER_ERR_DENY |
ACL_WRITE_OWNER_ERR_ALLOW |
ACL_WRITE_ATTRS_OWNER_SET_ALLOW |
ACL_WRITE_ATTRS_OWNER_ERR_DENY |
ACL_WRITE_ATTRS_WRITER_SET_DENY |
ACL_WRITE_ATTRS_WRITER_ERR_ALLOW |
ACL_WRITE_NAMED_WRITER_ERR_DENY |
ACL_READ_NAMED_READER_ERR_DENY);
if (mask_bit == ACE_SYNCHRONIZE) {
set_deny = ACL_SYNCHRONIZE_SET_DENY;
err_deny = ACL_SYNCHRONIZE_ERR_DENY;
set_allow = ACL_SYNCHRONIZE_SET_ALLOW;
err_allow = ACL_SYNCHRONIZE_ERR_ALLOW;
} else if (mask_bit == ACE_WRITE_OWNER) {
set_deny = ACL_WRITE_OWNER_SET_DENY;
err_deny = ACL_WRITE_OWNER_ERR_DENY;
set_allow = ACL_WRITE_OWNER_SET_ALLOW;
err_allow = ACL_WRITE_OWNER_ERR_ALLOW;
} else if (mask_bit == ACE_DELETE) {
set_deny = ACL_DELETE_SET_DENY;
err_deny = ACL_DELETE_ERR_DENY;
set_allow = ACL_DELETE_SET_ALLOW;
err_allow = ACL_DELETE_ERR_ALLOW;
} else if (mask_bit == ACE_WRITE_ATTRIBUTES) {
if (isowner) {
set_deny = ACL_WRITE_ATTRS_OWNER_SET_DENY;
err_deny = ACL_WRITE_ATTRS_OWNER_ERR_DENY;
set_allow = ACL_WRITE_ATTRS_OWNER_SET_ALLOW;
err_allow = ACL_WRITE_ATTRS_OWNER_ERR_ALLOW;
} else if (haswriteperm) {
set_deny = ACL_WRITE_ATTRS_WRITER_SET_DENY;
err_deny = ACL_WRITE_ATTRS_WRITER_ERR_DENY;
set_allow = ACL_WRITE_ATTRS_WRITER_SET_ALLOW;
err_allow = ACL_WRITE_ATTRS_WRITER_ERR_ALLOW;
} else {
if ((acep->a_access_mask & mask_bit) &&
(acep->a_type & ACE_ACCESS_ALLOWED_ACE_TYPE)) {
return (ENOTSUP);
}
return (0);
}
} else if (mask_bit == ACE_READ_NAMED_ATTRS) {
if (!hasreadperm)
return (0);
set_deny = ACL_READ_NAMED_READER_SET_DENY;
err_deny = ACL_READ_NAMED_READER_ERR_DENY;
set_allow = ACL_READ_NAMED_READER_SET_ALLOW;
err_allow = ACL_READ_NAMED_READER_ERR_ALLOW;
} else if (mask_bit == ACE_WRITE_NAMED_ATTRS) {
if (!haswriteperm)
return (0);
set_deny = ACL_WRITE_NAMED_WRITER_SET_DENY;
err_deny = ACL_WRITE_NAMED_WRITER_ERR_DENY;
set_allow = ACL_WRITE_NAMED_WRITER_SET_ALLOW;
err_allow = ACL_WRITE_NAMED_WRITER_ERR_ALLOW;
} else {
return (EINVAL);
}
if (acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) {
if (acl_consume & set_deny) {
if (!(acep->a_access_mask & mask_bit)) {
return (ENOTSUP);
}
} else if (acl_consume & err_deny) {
if (acep->a_access_mask & mask_bit) {
return (ENOTSUP);
}
}
} else {
/* ACE_ACCESS_ALLOWED_ACE_TYPE */
if (acl_consume & set_allow) {
if (!(acep->a_access_mask & mask_bit)) {
return (ENOTSUP);
}
} else if (acl_consume & err_allow) {
if (acep->a_access_mask & mask_bit) {
return (ENOTSUP);
}
}
}
return (0);
}
static int
ace_to_aent_legal(ace_t *acep)
{
int error = 0;
int isowner;
/* only ALLOW or DENY */
if ((acep->a_type != ACE_ACCESS_ALLOWED_ACE_TYPE) &&
(acep->a_type != ACE_ACCESS_DENIED_ACE_TYPE)) {
error = ENOTSUP;
goto out;
}
/* check for invalid flags */
if (acep->a_flags & ~(ACE_VALID_FLAG_BITS)) {
error = EINVAL;
goto out;
}
/* some flags are illegal */
if (acep->a_flags & (ACE_SUCCESSFUL_ACCESS_ACE_FLAG |
ACE_FAILED_ACCESS_ACE_FLAG |
ACE_NO_PROPAGATE_INHERIT_ACE)) {
error = ENOTSUP;
goto out;
}
/* check for invalid masks */
if (acep->a_access_mask & ~(ACE_VALID_MASK_BITS)) {
error = EINVAL;
goto out;
}
if ((acep->a_flags & ACE_OWNER)) {
isowner = 1;
} else {
isowner = 0;
}
error = access_mask_check(acep, ACE_SYNCHRONIZE, isowner);
if (error)
goto out;
error = access_mask_check(acep, ACE_WRITE_OWNER, isowner);
if (error)
goto out;
error = access_mask_check(acep, ACE_DELETE, isowner);
if (error)
goto out;
error = access_mask_check(acep, ACE_WRITE_ATTRIBUTES, isowner);
if (error)
goto out;
error = access_mask_check(acep, ACE_READ_NAMED_ATTRS, isowner);
if (error)
goto out;
error = access_mask_check(acep, ACE_WRITE_NAMED_ATTRS, isowner);
if (error)
goto out;
/* more detailed checking of masks */
if (acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) {
if (! (acep->a_access_mask & ACE_READ_ATTRIBUTES)) {
error = ENOTSUP;
goto out;
}
if ((acep->a_access_mask & ACE_WRITE_DATA) &&
(! (acep->a_access_mask & ACE_APPEND_DATA))) {
error = ENOTSUP;
goto out;
}
if ((! (acep->a_access_mask & ACE_WRITE_DATA)) &&
(acep->a_access_mask & ACE_APPEND_DATA)) {
error = ENOTSUP;
goto out;
}
}
/* ACL enforcement */
if ((acep->a_access_mask & ACE_READ_ACL) &&
(acep->a_type != ACE_ACCESS_ALLOWED_ACE_TYPE)) {
error = ENOTSUP;
goto out;
}
if (acep->a_access_mask & ACE_WRITE_ACL) {
if ((acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) &&
(isowner)) {
error = ENOTSUP;
goto out;
}
if ((acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) &&
(! isowner)) {
error = ENOTSUP;
goto out;
}
}
out:
return (error);
}
static int
ace_allow_to_mode(uint32_t mask, o_mode_t *modep, boolean_t isdir)
{
/* ACE_READ_ACL and ACE_READ_ATTRIBUTES must both be set */
if ((mask & (ACE_READ_ACL | ACE_READ_ATTRIBUTES)) !=
(ACE_READ_ACL | ACE_READ_ATTRIBUTES)) {
return (ENOTSUP);
}
return (ace_mask_to_mode(mask, modep, isdir));
}
static int
acevals_to_aent(acevals_t *vals, aclent_t *dest, ace_list_t *list,
uid_t owner, gid_t group, boolean_t isdir)
{
int error;
uint32_t flips = ACE_POSIX_SUPPORTED_BITS;
if (isdir)
flips |= ACE_DELETE_CHILD;
if (vals->allowed != (vals->denied ^ flips)) {
error = ENOTSUP;
goto out;
}
if ((list->hasmask) && (list->acl_mask != vals->mask) &&
(vals->aent_type & (USER | GROUP | GROUP_OBJ))) {
error = ENOTSUP;
goto out;
}
error = ace_allow_to_mode(vals->allowed, &dest->a_perm, isdir);
if (error != 0)
goto out;
dest->a_type = vals->aent_type;
if (dest->a_type & (USER | GROUP)) {
dest->a_id = vals->key;
} else if (dest->a_type & USER_OBJ) {
dest->a_id = owner;
} else if (dest->a_type & GROUP_OBJ) {
dest->a_id = group;
} else if (dest->a_type & OTHER_OBJ) {
dest->a_id = 0;
} else {
error = EINVAL;
goto out;
}
out:
return (error);
}
static int
ace_list_to_aent(ace_list_t *list, aclent_t **aclentp, int *aclcnt,
uid_t owner, gid_t group, boolean_t isdir)
{
int error = 0;
aclent_t *aent, *result = NULL;
acevals_t *vals;
int resultcount;
if ((list->seen & (USER_OBJ | GROUP_OBJ | OTHER_OBJ)) !=
(USER_OBJ | GROUP_OBJ | OTHER_OBJ)) {
error = ENOTSUP;
goto out;
}
if ((! list->hasmask) && (list->numusers + list->numgroups > 0)) {
error = ENOTSUP;
goto out;
}
resultcount = 3 + list->numusers + list->numgroups;
/*
* This must be the same condition as below, when we add the CLASS_OBJ
* (aka ACL mask)
*/
if ((list->hasmask) || (! list->dfacl_flag))
resultcount += 1;
if (cacl_malloc((void **)&result,
resultcount * sizeof (aclent_t)) != 0) {
error = ENOMEM;
goto out;
}
aent = result;
/* USER_OBJ */
if (!(list->user_obj.aent_type & USER_OBJ)) {
error = EINVAL;
goto out;
}
error = acevals_to_aent(&list->user_obj, aent, list, owner, group,
isdir);
if (error != 0)
goto out;
++aent;
/* USER */
vals = NULL;
for (vals = avl_first(&list->user); vals != NULL;
vals = AVL_NEXT(&list->user, vals)) {
if (!(vals->aent_type & USER)) {
error = EINVAL;
goto out;
}
error = acevals_to_aent(vals, aent, list, owner, group,
isdir);
if (error != 0)
goto out;
++aent;
}
/* GROUP_OBJ */
if (!(list->group_obj.aent_type & GROUP_OBJ)) {
error = EINVAL;
goto out;
}
error = acevals_to_aent(&list->group_obj, aent, list, owner, group,
isdir);
if (error != 0)
goto out;
++aent;
/* GROUP */
vals = NULL;
for (vals = avl_first(&list->group); vals != NULL;
vals = AVL_NEXT(&list->group, vals)) {
if (!(vals->aent_type & GROUP)) {
error = EINVAL;
goto out;
}
error = acevals_to_aent(vals, aent, list, owner, group,
isdir);
if (error != 0)
goto out;
++aent;
}
/*
* CLASS_OBJ (aka ACL_MASK)
*
* An ACL_MASK is not fabricated if the ACL is a default ACL.
* This is to follow UFS's behavior.
*/
if ((list->hasmask) || (! list->dfacl_flag)) {
if (list->hasmask) {
uint32_t flips = ACE_POSIX_SUPPORTED_BITS;
if (isdir)
flips |= ACE_DELETE_CHILD;
error = ace_mask_to_mode(list->acl_mask ^ flips,
&aent->a_perm, isdir);
if (error != 0)
goto out;
} else {
/* fabricate the ACL_MASK from the group permissions */
error = ace_mask_to_mode(list->group_obj.allowed,
&aent->a_perm, isdir);
if (error != 0)
goto out;
}
aent->a_id = 0;
aent->a_type = CLASS_OBJ | list->dfacl_flag;
++aent;
}
/* OTHER_OBJ */
if (!(list->other_obj.aent_type & OTHER_OBJ)) {
error = EINVAL;
goto out;
}
error = acevals_to_aent(&list->other_obj, aent, list, owner, group,
isdir);
if (error != 0)
goto out;
++aent;
*aclentp = result;
*aclcnt = resultcount;
out:
if (error != 0) {
if (result != NULL)
cacl_free(result, resultcount * sizeof (aclent_t));
}
return (error);
}
/*
* free all data associated with an ace_list
*/
static void
ace_list_free(ace_list_t *al)
{
acevals_t *node;
void *cookie;
if (al == NULL)
return;
cookie = NULL;
while ((node = avl_destroy_nodes(&al->user, &cookie)) != NULL)
cacl_free(node, sizeof (acevals_t));
cookie = NULL;
while ((node = avl_destroy_nodes(&al->group, &cookie)) != NULL)
cacl_free(node, sizeof (acevals_t));
avl_destroy(&al->user);
avl_destroy(&al->group);
/* free the container itself */
cacl_free(al, sizeof (ace_list_t));
}
static int
acevals_compare(const void *va, const void *vb)
{
const acevals_t *a = va, *b = vb;
if (a->key == b->key)
return (0);
if (a->key > b->key)
return (1);
else
return (-1);
}
/*
* Convert a list of ace_t entries to equivalent regular and default
* aclent_t lists. Return error (ENOTSUP) when conversion is not possible.
*/
static int
ln_ace_to_aent(ace_t *ace, int n, uid_t owner, gid_t group,
aclent_t **aclentp, int *aclcnt, aclent_t **dfaclentp, int *dfaclcnt,
boolean_t isdir)
{
int error = 0;
ace_t *acep;
uint32_t bits;
int i;
ace_list_t *normacl = NULL, *dfacl = NULL, *acl;
acevals_t *vals;
*aclentp = NULL;
*aclcnt = 0;
*dfaclentp = NULL;
*dfaclcnt = 0;
/* we need at least user_obj, group_obj, and other_obj */
if (n < 6) {
error = ENOTSUP;
goto out;
}
if (ace == NULL) {
error = EINVAL;
goto out;
}
error = cacl_malloc((void **)&normacl, sizeof (ace_list_t));
if (error != 0)
goto out;
avl_create(&normacl->user, acevals_compare, sizeof (acevals_t),
offsetof(acevals_t, avl));
avl_create(&normacl->group, acevals_compare, sizeof (acevals_t),
offsetof(acevals_t, avl));
ace_list_init(normacl, 0);
error = cacl_malloc((void **)&dfacl, sizeof (ace_list_t));
if (error != 0)
goto out;
avl_create(&dfacl->user, acevals_compare, sizeof (acevals_t),
offsetof(acevals_t, avl));
avl_create(&dfacl->group, acevals_compare, sizeof (acevals_t),
offsetof(acevals_t, avl));
ace_list_init(dfacl, ACL_DEFAULT);
/* process every ace_t... */
for (i = 0; i < n; i++) {
acep = &ace[i];
/* rule out certain cases quickly */
error = ace_to_aent_legal(acep);
if (error != 0)
goto out;
/*
* Turn off these bits in order to not have to worry about
* them when doing the checks for compliments.
*/
acep->a_access_mask &= ~(ACE_WRITE_OWNER | ACE_DELETE |
ACE_SYNCHRONIZE | ACE_WRITE_ATTRIBUTES |
ACE_READ_NAMED_ATTRS | ACE_WRITE_NAMED_ATTRS);
/* see if this should be a regular or default acl */
bits = acep->a_flags &
(ACE_INHERIT_ONLY_ACE |
ACE_FILE_INHERIT_ACE |
ACE_DIRECTORY_INHERIT_ACE);
if (bits != 0) {
/* all or nothing on these inherit bits */
if (bits != (ACE_INHERIT_ONLY_ACE |
ACE_FILE_INHERIT_ACE |
ACE_DIRECTORY_INHERIT_ACE)) {
error = ENOTSUP;
goto out;
}
acl = dfacl;
} else {
acl = normacl;
}
if ((acep->a_flags & ACE_OWNER)) {
if (acl->state > ace_user_obj) {
error = ENOTSUP;
goto out;
}
acl->state = ace_user_obj;
acl->seen |= USER_OBJ;
vals = &acl->user_obj;
vals->aent_type = USER_OBJ | acl->dfacl_flag;
} else if ((acep->a_flags & ACE_EVERYONE)) {
acl->state = ace_other_obj;
acl->seen |= OTHER_OBJ;
vals = &acl->other_obj;
vals->aent_type = OTHER_OBJ | acl->dfacl_flag;
} else if (acep->a_flags & ACE_IDENTIFIER_GROUP) {
if (acl->state > ace_group) {
error = ENOTSUP;
goto out;
}
if ((acep->a_flags & ACE_GROUP)) {
acl->seen |= GROUP_OBJ;
vals = &acl->group_obj;
vals->aent_type = GROUP_OBJ | acl->dfacl_flag;
} else {
acl->seen |= GROUP;
vals = acevals_find(acep, &acl->group,
&acl->numgroups);
if (vals == NULL) {
error = ENOMEM;
goto out;
}
vals->aent_type = GROUP | acl->dfacl_flag;
}
acl->state = ace_group;
} else {
if (acl->state > ace_user) {
error = ENOTSUP;
goto out;
}
acl->state = ace_user;
acl->seen |= USER;
vals = acevals_find(acep, &acl->user,
&acl->numusers);
if (vals == NULL) {
error = ENOMEM;
goto out;
}
vals->aent_type = USER | acl->dfacl_flag;
}
if (!(acl->state > ace_unused)) {
error = EINVAL;
goto out;
}
if (acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) {
/* no more than one allowed per aclent_t */
if (vals->allowed != ACE_MASK_UNDEFINED) {
error = ENOTSUP;
goto out;
}
vals->allowed = acep->a_access_mask;
} else {
/*
* it's a DENY; if there was a previous DENY, it
* must have been an ACL_MASK.
*/
if (vals->denied != ACE_MASK_UNDEFINED) {
/* ACL_MASK is for USER and GROUP only */
if ((acl->state != ace_user) &&
(acl->state != ace_group)) {
error = ENOTSUP;
goto out;
}
if (! acl->hasmask) {
acl->hasmask = 1;
acl->acl_mask = vals->denied;
/* check for mismatched ACL_MASK emulations */
} else if (acl->acl_mask != vals->denied) {
error = ENOTSUP;
goto out;
}
vals->mask = vals->denied;
}
vals->denied = acep->a_access_mask;
}
}
/* done collating; produce the aclent_t lists */
if (normacl->state != ace_unused) {
error = ace_list_to_aent(normacl, aclentp, aclcnt,
owner, group, isdir);
if (error != 0) {
goto out;
}
}
if (dfacl->state != ace_unused) {
error = ace_list_to_aent(dfacl, dfaclentp, dfaclcnt,
owner, group, isdir);
if (error != 0) {
goto out;
}
}
out:
if (normacl != NULL)
ace_list_free(normacl);
if (dfacl != NULL)
ace_list_free(dfacl);
return (error);
}
static int
convert_ace_to_aent(ace_t *acebufp, int acecnt, boolean_t isdir,
uid_t owner, gid_t group, aclent_t **retaclentp, int *retaclcnt)
{
int error = 0;
aclent_t *aclentp, *dfaclentp;
int aclcnt, dfaclcnt;
int aclsz, dfaclsz;
error = ln_ace_to_aent(acebufp, acecnt, owner, group,
&aclentp, &aclcnt, &dfaclentp, &dfaclcnt, isdir);
if (error)
return (error);
if (dfaclcnt != 0) {
/*
* Slap aclentp and dfaclentp into a single array.
*/
aclsz = sizeof (aclent_t) * aclcnt;
dfaclsz = sizeof (aclent_t) * dfaclcnt;
aclentp = cacl_realloc(aclentp, aclsz, aclsz + dfaclsz);
if (aclentp != NULL) {
(void) memcpy(aclentp + aclcnt, dfaclentp, dfaclsz);
} else {
error = ENOMEM;
}
}
if (aclentp) {
*retaclentp = aclentp;
*retaclcnt = aclcnt + dfaclcnt;
}
if (dfaclentp)
cacl_free(dfaclentp, dfaclsz);
return (error);
}
int
acl_translate(acl_t *aclp, int target_flavor, boolean_t isdir, uid_t owner,
gid_t group)
{
int aclcnt;
void *acldata;
int error;
/*
* See if we need to translate
*/
if ((target_flavor == _ACL_ACE_ENABLED && aclp->acl_type == ACE_T) ||
(target_flavor == _ACL_ACLENT_ENABLED &&
aclp->acl_type == ACLENT_T))
return (0);
if (target_flavor == -1) {
error = EINVAL;
goto out;
}
if (target_flavor == _ACL_ACE_ENABLED &&
aclp->acl_type == ACLENT_T) {
error = convert_aent_to_ace(aclp->acl_aclp,
aclp->acl_cnt, isdir, (ace_t **)&acldata, &aclcnt);
if (error)
goto out;
} else if (target_flavor == _ACL_ACLENT_ENABLED &&
aclp->acl_type == ACE_T) {
error = convert_ace_to_aent(aclp->acl_aclp, aclp->acl_cnt,
isdir, owner, group, (aclent_t **)&acldata, &aclcnt);
if (error)
goto out;
} else {
error = ENOTSUP;
goto out;
}
/*
* replace old acl with newly translated acl
*/
cacl_free(aclp->acl_aclp, aclp->acl_cnt * aclp->acl_entry_size);
aclp->acl_aclp = acldata;
aclp->acl_cnt = aclcnt;
if (target_flavor == _ACL_ACE_ENABLED) {
aclp->acl_type = ACE_T;
aclp->acl_entry_size = sizeof (ace_t);
} else {
aclp->acl_type = ACLENT_T;
aclp->acl_entry_size = sizeof (aclent_t);
}
return (0);
out:
#if !defined(_KERNEL)
errno = error;
return (-1);
#else
return (error);
#endif
}
#endif /* !_KERNEL */
#define SET_ACE(acl, index, who, mask, type, flags) { \
acl[0][index].a_who = (uint32_t)who; \
acl[0][index].a_type = type; \
acl[0][index].a_flags = flags; \
acl[0][index++].a_access_mask = mask; \
}
void
acl_trivial_access_masks(mode_t mode, boolean_t isdir, trivial_acl_t *masks)
{
uint32_t read_mask = ACE_READ_DATA;
uint32_t write_mask = ACE_WRITE_DATA|ACE_APPEND_DATA;
uint32_t execute_mask = ACE_EXECUTE;
(void) isdir; /* will need this later */
masks->deny1 = 0;
if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH)))
masks->deny1 |= read_mask;
if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH)))
masks->deny1 |= write_mask;
if (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH)))
masks->deny1 |= execute_mask;
masks->deny2 = 0;
if (!(mode & S_IRGRP) && (mode & S_IROTH))
masks->deny2 |= read_mask;
if (!(mode & S_IWGRP) && (mode & S_IWOTH))
masks->deny2 |= write_mask;
if (!(mode & S_IXGRP) && (mode & S_IXOTH))
masks->deny2 |= execute_mask;
masks->allow0 = 0;
if ((mode & S_IRUSR) && (!(mode & S_IRGRP) && (mode & S_IROTH)))
masks->allow0 |= read_mask;
if ((mode & S_IWUSR) && (!(mode & S_IWGRP) && (mode & S_IWOTH)))
masks->allow0 |= write_mask;
if ((mode & S_IXUSR) && (!(mode & S_IXGRP) && (mode & S_IXOTH)))
masks->allow0 |= execute_mask;
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)
masks->owner |= read_mask;
if (mode & S_IWUSR)
masks->owner |= write_mask;
if (mode & S_IXUSR)
masks->owner |= execute_mask;
masks->group = ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_NAMED_ATTRS|
ACE_SYNCHRONIZE;
if (mode & S_IRGRP)
masks->group |= read_mask;
if (mode & S_IWGRP)
masks->group |= write_mask;
if (mode & S_IXGRP)
masks->group |= execute_mask;
masks->everyone = ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_NAMED_ATTRS|
ACE_SYNCHRONIZE;
if (mode & S_IROTH)
masks->everyone |= read_mask;
if (mode & S_IWOTH)
masks->everyone |= write_mask;
if (mode & S_IXOTH)
masks->everyone |= execute_mask;
}
int
acl_trivial_create(mode_t mode, boolean_t isdir, ace_t **acl, int *count)
{
int index = 0;
int error;
trivial_acl_t masks;
*count = 3;
acl_trivial_access_masks(mode, isdir, &masks);
if (masks.allow0)
(*count)++;
if (masks.deny1)
(*count)++;
if (masks.deny2)
(*count)++;
if ((error = cacl_malloc((void **)acl, *count * sizeof (ace_t))) != 0)
return (error);
if (masks.allow0) {
SET_ACE(acl, index, -1, masks.allow0,
ACE_ACCESS_ALLOWED_ACE_TYPE, ACE_OWNER);
}
if (masks.deny1) {
SET_ACE(acl, index, -1, masks.deny1,
ACE_ACCESS_DENIED_ACE_TYPE, ACE_OWNER);
}
if (masks.deny2) {
SET_ACE(acl, index, -1, masks.deny2,
ACE_ACCESS_DENIED_ACE_TYPE, ACE_GROUP|ACE_IDENTIFIER_GROUP);
}
SET_ACE(acl, index, -1, masks.owner, ACE_ACCESS_ALLOWED_ACE_TYPE,
ACE_OWNER);
SET_ACE(acl, index, -1, masks.group, ACE_ACCESS_ALLOWED_ACE_TYPE,
ACE_IDENTIFIER_GROUP|ACE_GROUP);
SET_ACE(acl, index, -1, masks.everyone, ACE_ACCESS_ALLOWED_ACE_TYPE,
ACE_EVERYONE);
return (0);
}
/*
* ace_trivial:
* determine whether an ace_t acl is trivial
*
* Trivialness implies that the acl is composed of only
* owner, group, everyone entries. ACL can't
* have read_acl denied, and write_owner/write_acl/write_attributes
* can only be owner@ entry.
*/
int
ace_trivial_common(void *acep, int aclcnt,
uint64_t (*walk)(void *, uint64_t, int aclcnt,
uint16_t *, uint16_t *, uint32_t *))
{
uint16_t flags;
uint32_t mask;
uint16_t type;
uint64_t cookie = 0;
while ((cookie = walk(acep, cookie, aclcnt, &flags, &type, &mask))) {
switch (flags & ACE_TYPE_FLAGS) {
case ACE_OWNER:
case ACE_GROUP|ACE_IDENTIFIER_GROUP:
case ACE_EVERYONE:
break;
default:
return (1);
}
if (flags & (ACE_FILE_INHERIT_ACE|
ACE_DIRECTORY_INHERIT_ACE|ACE_NO_PROPAGATE_INHERIT_ACE|
ACE_INHERIT_ONLY_ACE))
return (1);
/*
* Special check for some special bits
*
* Don't allow anybody to deny reading basic
* attributes or a files ACL.
*/
if ((mask & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) &&
(type == ACE_ACCESS_DENIED_ACE_TYPE))
return (1);
/*
* Delete permissions are never set by default
*/
if (mask & (ACE_DELETE|ACE_DELETE_CHILD))
return (1);
/*
* only allow owner@ to have
* write_acl/write_owner/write_attributes/write_xattr/
*/
if (type == ACE_ACCESS_ALLOWED_ACE_TYPE &&
(!(flags & ACE_OWNER) && (mask &
(ACE_WRITE_OWNER|ACE_WRITE_ACL| ACE_WRITE_ATTRIBUTES|
ACE_WRITE_NAMED_ATTRS))))
return (1);
}
return (0);
}
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