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samba-mirror/source3/smbd/smb2_posix.c
David Mulder d0ad452fc8 s3: smbd: store_smb2_posix_info hide info for '..'
When receiving a query for '..', hide the owner
and group sids, the inode, and the dev id.

Signed-off-by: David Mulder <dmulder@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
2022-11-29 10:26:38 +00:00

180 lines
4.2 KiB
C

/*
Unix SMB/CIFS implementation.
SMB2 POSIX code.
Copyright (C) Jeremy Allison 2022
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "smbd/smbd.h"
#include "passdb/lookup_sid.h"
#include "librpc/gen_ndr/ndr_security.h"
#include "libcli/security/security.h"
/*
* SMB2 POSIX create context return details.
*/
ssize_t smb2_posix_cc_info(
connection_struct *conn,
uint32_t reparse_tag,
const SMB_STRUCT_STAT *psbuf,
const struct dom_sid *owner,
const struct dom_sid *group,
uint8_t *buf,
size_t buflen)
{
size_t owner_sid_size = ndr_size_dom_sid(owner, 0);
size_t group_sid_size = ndr_size_dom_sid(group, 0);
size_t b_size = 12;
owner_sid_size = ndr_size_dom_sid(owner, 0);
if (b_size + owner_sid_size < b_size) {
return -1;
}
b_size += owner_sid_size;
group_sid_size = ndr_size_dom_sid(group, 0);
if (b_size + group_sid_size < b_size) {
return -1;
}
b_size += group_sid_size;
if (buflen < b_size) {
return b_size;
}
/* number of hard links */
PUSH_LE_U32(buf, 0, psbuf->st_ex_nlink);
/* Reparse tag if FILE_FLAG_REPARSE is set, else zero. */
PUSH_LE_U32(buf, 4, reparse_tag);
/*
* Remove type info from mode, leaving only the
* permissions and setuid/gid bits.
*/
PUSH_LE_U32(buf,
8,
unix_perms_to_wire(psbuf->st_ex_mode & ~S_IFMT));
buf += 12;
buflen -= 12;
/* Now add in the owner and group sids. */
sid_linearize(buf, buflen, owner);
buf += owner_sid_size;
buflen -= owner_sid_size;
sid_linearize(buf, buflen, group);
return b_size;
}
/*
* SMB2 POSIX info level.
*/
ssize_t store_smb2_posix_info(
connection_struct *conn,
const SMB_STRUCT_STAT *psbuf,
uint32_t reparse_tag,
uint32_t dos_attributes,
uint8_t *buf,
size_t buflen)
{
uint64_t file_id = SMB_VFS_FS_FILE_ID(conn, psbuf);
struct dom_sid owner = global_sid_NULL;
struct dom_sid group = global_sid_NULL;
ssize_t cc_len;
if (psbuf->st_ex_uid != (uid_t)-1) {
uid_to_sid(&owner, psbuf->st_ex_uid);
}
if (psbuf->st_ex_gid != (gid_t)-1) {
gid_to_sid(&group, psbuf->st_ex_gid);
}
cc_len = smb2_posix_cc_info(
conn, reparse_tag, psbuf, &owner, &group, NULL, 0);
if (cc_len == -1) {
return -1;
}
if (cc_len + 68 < 68) {
return -1;
}
if (buflen < cc_len + 68) {
return cc_len + 68;
}
/* Timestamps. */
/* Birth (creation) time. */
put_long_date_timespec(TIMESTAMP_SET_NT_OR_BETTER,
(char *)buf+0,
psbuf->st_ex_btime);
/* Access time. */
put_long_date_timespec(TIMESTAMP_SET_NT_OR_BETTER,
(char *)buf+8,
psbuf->st_ex_atime);
/* Last write time. */
put_long_date_timespec(TIMESTAMP_SET_NT_OR_BETTER,
(char *)buf+16,
psbuf->st_ex_mtime);
/* Change time. */
put_long_date_timespec(TIMESTAMP_SET_NT_OR_BETTER,
(char *)buf+24,
psbuf->st_ex_ctime);
/* File size 64 Bit */
SOFF_T(buf,32, get_file_size_stat(psbuf));
/* Number of bytes used on disk - 64 Bit */
SOFF_T(buf,40,SMB_VFS_GET_ALLOC_SIZE(conn,NULL,psbuf));
/* DOS attributes */
if (S_ISREG(psbuf->st_ex_mode)) {
PUSH_LE_U32(buf, 48, dos_attributes);
} else if (S_ISDIR(psbuf->st_ex_mode)) {
PUSH_LE_U32(buf, 48, dos_attributes|FILE_ATTRIBUTE_DIRECTORY);
} else {
/*
* All non-directory or regular files are reported
* as reparse points. Client may or may not be able
* to access these.
*/
PUSH_LE_U32(buf, 48, FILE_ATTRIBUTE_REPARSE_POINT);
}
/* Add the inode and dev (16 bytes). */
PUSH_LE_U64(buf, 52, file_id);
PUSH_LE_U64(buf, 60, psbuf->st_ex_dev);
/*
* Append a POSIX create context (variable bytes).
*/
smb2_posix_cc_info(
conn,
reparse_tag,
psbuf,
&owner,
&group,
buf + 68,
cc_len);
return cc_len + 68;
}