/*
* Brand ACL as "brand".
*/
void
_acl_brand_as(acl_t acl, int brand)
{
assert(_acl_brand_may_be(acl, brand));
acl->ats_brand = brand;
}
int
_entry_brand_may_be(const acl_entry_t entry, int brand)
{
return (_acl_brand_may_be(entry2acl(entry), brand));
}
/*
* acl_calc_mask() (23.4.2): calculate and set the permissions
* associated with the ACL_MASK ACL entry. If the ACL already
* contains an ACL_MASK entry, its permissions shall be
* overwritten; if not, one shall be added.
*/
int
acl_calc_mask(acl_t *acl_p)
{
struct acl *acl_int, *acl_int_new;
acl_t acl_new;
int i, mask_mode, mask_num;
/*
* (23.4.2.4) requires acl_p to point to a pointer to a valid ACL.
* Since one of the primary reasons to use this function would be
* to calculate the appropriate mask to obtain a valid ACL, we only
* perform sanity checks here and validate the ACL prior to
* returning.
*/
if (acl_p == NULL || *acl_p == NULL) {
errno = EINVAL;
return (-1);
}
if (!_acl_brand_may_be(*acl_p, ACL_BRAND_POSIX)) {
errno = EINVAL;
return (-1);
}
_acl_brand_as(*acl_p, ACL_BRAND_POSIX);
acl_int = &(*acl_p)->ats_acl;
if ((acl_int->acl_cnt < 3) || (acl_int->acl_cnt > ACL_MAX_ENTRIES)) {
errno = EINVAL;
return (-1);
}
acl_new = acl_dup(*acl_p);
if (acl_new == NULL)
return (-1);
acl_int_new = &acl_new->ats_acl;
mask_mode = 0;
mask_num = -1;
/* gather permissions and find a mask entry */
for (i = 0; i < acl_int_new->acl_cnt; i++) {
switch(acl_int_new->acl_entry[i].ae_tag) {
case ACL_USER:
case ACL_GROUP:
case ACL_GROUP_OBJ:
mask_mode |=
acl_int_new->acl_entry[i].ae_perm & ACL_PERM_BITS;
break;
case ACL_MASK:
mask_num = i;
break;
}
}
/* if a mask entry already exists, overwrite the perms */
if (mask_num != -1)
acl_int_new->acl_entry[mask_num].ae_perm = mask_mode;
else {
/* if no mask exists, check acl_cnt... */
if (acl_int_new->acl_cnt == ACL_MAX_ENTRIES) {
errno = ENOMEM;
acl_free(acl_new);
return (-1);
}
/* ...and add the mask entry */
acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_tag = ACL_MASK;
acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_id =
ACL_UNDEFINED_ID;
acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_perm =
mask_mode;
acl_int_new->acl_cnt++;
}
if (acl_valid(acl_new) == -1) {
errno = EINVAL;
acl_free(acl_new);
return (-1);
}
**acl_p = *acl_new;
acl_free(acl_new);
return (0);
}
