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#include "include/compat.h"
#include "include/types.h"
#include "include/fs_types.h"
#include <sys/stat.h>
#include "posix_acl.h"
#include "UserPerm.h"
int posix_acl_check(const void *xattr, size_t size)
{
const acl_ea_header *header;
if (size < sizeof(*header))
return -1;
header = reinterpret_cast<const acl_ea_header*>(xattr);
ceph_le32 expected_version;
expected_version = ACL_EA_VERSION;
if (header->a_version != expected_version)
return -1;
const acl_ea_entry *entry = header->a_entries;
size -= sizeof(*header);
if (size % sizeof(*entry))
return -1;
int count = size / sizeof(*entry);
if (count == 0)
return 0;
int state = ACL_USER_OBJ;
int needs_mask = 0;
for (int i = 0; i < count; ++i) {
__u16 tag = entry->e_tag;
switch(tag) {
case ACL_USER_OBJ:
if (state == ACL_USER_OBJ) {
state = ACL_USER;
break;
}
return -1;
case ACL_USER:
if (state != ACL_USER)
return -1;
needs_mask = 1;
break;
case ACL_GROUP_OBJ:
if (state == ACL_USER) {
state = ACL_GROUP;
break;
}
return -1;
case ACL_GROUP:
if (state != ACL_GROUP)
return -1;
needs_mask = 1;
break;
case ACL_MASK:
if (state != ACL_GROUP)
return -1;
state = ACL_OTHER;
break;
case ACL_OTHER:
if (state == ACL_OTHER ||
(state == ACL_GROUP && !needs_mask)) {
state = 0;
break;
}
// fall-thru
default:
return -1;
}
++entry;
}
return state == 0 ? count : -1;
}
int posix_acl_equiv_mode(const void *xattr, size_t size, mode_t *mode_p)
{
if (posix_acl_check(xattr, size) < 0)
return -CEPHFS_EINVAL;
int not_equiv = 0;
mode_t mode = 0;
const acl_ea_header *header = reinterpret_cast<const acl_ea_header*>(xattr);
const acl_ea_entry *entry = header->a_entries;
int count = (size - sizeof(*header)) / sizeof(*entry);
for (int i = 0; i < count; ++i) {
__u16 tag = entry->e_tag;
__u16 perm = entry->e_perm;
switch(tag) {
case ACL_USER_OBJ:
mode |= (perm & S_IRWXO) << 6;
break;
case ACL_GROUP_OBJ:
mode |= (perm & S_IRWXO) << 3;
break;
case ACL_OTHER:
mode |= perm & S_IRWXO;
break;
case ACL_MASK:
mode = (mode & ~S_IRWXG) | ((perm & S_IRWXO) << 3);
/* fall through */
case ACL_USER:
case ACL_GROUP:
not_equiv = 1;
break;
default:
return -CEPHFS_EINVAL;
}
++entry;
}
if (mode_p)
*mode_p = (*mode_p & ~ACCESSPERMS) | mode;
return not_equiv;
}
int posix_acl_inherit_mode(bufferptr& acl, mode_t *mode_p)
{
if (posix_acl_check(acl.c_str(), acl.length()) <= 0)
return -CEPHFS_EIO;
acl_ea_entry *group_entry = NULL, *mask_entry = NULL;
mode_t mode = *mode_p;
int not_equiv = 0;
acl_ea_header *header = reinterpret_cast<acl_ea_header*>(acl.c_str());
acl_ea_entry *entry = header->a_entries;
int count = (acl.length() - sizeof(*header)) / sizeof(*entry);
for (int i = 0; i < count; ++i) {
__u16 tag = entry->e_tag;
__u16 perm = entry->e_perm;
switch(tag) {
case ACL_USER_OBJ:
perm &= (mode >> 6) | ~S_IRWXO;
mode &= (perm << 6) | ~S_IRWXU;
entry->e_perm = perm;
break;
case ACL_USER:
case ACL_GROUP:
not_equiv = 1;
break;
case ACL_GROUP_OBJ:
group_entry = entry;
break;
case ACL_OTHER:
perm &= mode | ~S_IRWXO;
mode &= perm | ~S_IRWXO;
entry->e_perm = perm;
break;
case ACL_MASK:
mask_entry = entry;
not_equiv = 1;
break;
default:
return -CEPHFS_EIO;
}
++entry;
}
if (mask_entry) {
__u16 perm = mask_entry->e_perm;
perm &= (mode >> 3) | ~S_IRWXO;
mode &= (perm << 3) | ~S_IRWXG;
mask_entry->e_perm = perm;
} else {
if (!group_entry)
return -CEPHFS_EIO;
__u16 perm = group_entry->e_perm;
perm &= (mode >> 3) | ~S_IRWXO;
mode &= (perm << 3) | ~S_IRWXG;
group_entry->e_perm = perm;
}
*mode_p = (*mode_p & ~ACCESSPERMS) | mode;
return not_equiv;
}
int posix_acl_access_chmod(bufferptr& acl, mode_t mode)
{
if (posix_acl_check(acl.c_str(), acl.length()) <= 0)
return -CEPHFS_EIO;
acl_ea_entry *group_entry = NULL, *mask_entry = NULL;
acl_ea_header *header = reinterpret_cast<acl_ea_header*>(acl.c_str());
acl_ea_entry *entry = header->a_entries;
int count = (acl.length() - sizeof(*header)) / sizeof(*entry);
for (int i = 0; i < count; ++i) {
__u16 tag = entry->e_tag;
switch(tag) {
case ACL_USER_OBJ:
entry->e_perm = (mode & S_IRWXU) >> 6;
break;
case ACL_GROUP_OBJ:
group_entry = entry;
break;
case ACL_MASK:
mask_entry = entry;
break;
case ACL_OTHER:
entry->e_perm = mode & S_IRWXO;
break;
default:
break;
}
++entry;
}
if (mask_entry) {
mask_entry->e_perm = (mode & S_IRWXG) >> 3;
} else {
if (!group_entry)
return -CEPHFS_EIO;
group_entry->e_perm = (mode & S_IRWXG) >> 3;
}
return 0;
}
int posix_acl_permits(const bufferptr& acl, uid_t i_uid, gid_t i_gid,
const UserPerm& perms, unsigned want)
{
if (posix_acl_check(acl.c_str(), acl.length()) < 0)
return -CEPHFS_EIO;
const acl_ea_header *header = reinterpret_cast<const acl_ea_header*>(acl.c_str());
const acl_ea_entry *entry = header->a_entries;
const acl_ea_entry *next_entry;
__u16 perm, tag;
__u32 id;
int group_found = 0;
int idx;
int count = (acl.length() - sizeof(*header)) / sizeof(*entry);
for (idx = 0; idx < count; ++idx) {
tag = entry->e_tag;
perm = entry->e_perm;
switch(tag) {
case ACL_USER_OBJ:
if (i_uid == perms.uid())
goto check_perm;
break;
case ACL_USER:
id = entry->e_id;
if (id == perms.uid())
goto check_mask;
break;
case ACL_GROUP_OBJ:
/* fall through */
case ACL_GROUP:
id = (tag == ACL_GROUP_OBJ) ? i_gid : entry->e_id;
if (perms.gid_in_groups(id)) {
group_found = 1;
if ((perm & want) == want)
goto check_mask;
}
break;
case ACL_MASK:
break;
case ACL_OTHER:
if (group_found)
return -CEPHFS_EACCES;
else
goto check_perm;
break;
default:
return -CEPHFS_EIO;
}
++entry;
}
return -CEPHFS_EIO;
check_mask:
next_entry = entry + 1;
for (++idx; idx < count; ++idx) {
tag = next_entry->e_tag;
if (tag == ACL_MASK) {
__u16 mask = next_entry->e_perm;
if ((perm & mask & want) == want)
return 0;
return -CEPHFS_EACCES;
}
++next_entry;
}
check_perm:
if ((perm & want) == want)
return 0;
return -CEPHFS_EACCES;
}
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