1/*
2 *   fs/cifs/cifsacl.h
3 *
4 *   Copyright (c) International Business Machines  Corp., 2007
5 *   Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 *   This library is free software; you can redistribute it and/or modify
8 *   it under the terms of the GNU Lesser General Public License as published
9 *   by the Free Software Foundation; either version 2.1 of the License, or
10 *   (at your option) any later version.
11 *
12 *   This library is distributed in the hope that it will be useful,
13 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
14 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
15 *   the GNU Lesser General Public License for more details.
16 *
17 *   You should have received a copy of the GNU Lesser General Public License
18 *   along with this library; if not, write to the Free Software
19 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#ifndef _CIFSACL_H
23#define _CIFSACL_H
24
25
26#define NUM_AUTHS (6)	/* number of authority fields */
27#define SID_MAX_SUB_AUTHORITIES (15) /* max number of sub authority fields */
28
29#define READ_BIT        0x4
30#define WRITE_BIT       0x2
31#define EXEC_BIT        0x1
32
33#define UBITSHIFT	6
34#define GBITSHIFT	3
35
36#define ACCESS_ALLOWED	0
37#define ACCESS_DENIED	1
38
39#define SIDOWNER 1
40#define SIDGROUP 2
41
42/*
43 * Security Descriptor length containing DACL with 3 ACEs (one each for
44 * owner, group and world).
45 */
46#define DEFAULT_SEC_DESC_LEN (sizeof(struct cifs_ntsd) + \
47			      sizeof(struct cifs_acl) + \
48			      (sizeof(struct cifs_ace) * 3))
49
50/*
51 * Maximum size of a string representation of a SID:
52 *
53 * The fields are unsigned values in decimal. So:
54 *
55 * u8:  max 3 bytes in decimal
56 * u32: max 10 bytes in decimal
57 *
58 * "S-" + 3 bytes for version field + 15 for authority field + NULL terminator
59 *
60 * For authority field, max is when all 6 values are non-zero and it must be
61 * represented in hex. So "-0x" + 12 hex digits.
62 *
63 * Add 11 bytes for each subauthority field (10 bytes each + 1 for '-')
64 */
65#define SID_STRING_BASE_SIZE (2 + 3 + 15 + 1)
66#define SID_STRING_SUBAUTH_SIZE (11) /* size of a single subauth string */
67
68struct cifs_ntsd {
69	__le16 revision; /* revision level */
70	__le16 type;
71	__le32 osidoffset;
72	__le32 gsidoffset;
73	__le32 sacloffset;
74	__le32 dacloffset;
75} __attribute__((packed));
76
77struct cifs_sid {
78	__u8 revision; /* revision level */
79	__u8 num_subauth;
80	__u8 authority[NUM_AUTHS];
81	__le32 sub_auth[SID_MAX_SUB_AUTHORITIES]; /* sub_auth[num_subauth] */
82} __attribute__((packed));
83
84/* size of a struct cifs_sid, sans sub_auth array */
85#define CIFS_SID_BASE_SIZE (1 + 1 + NUM_AUTHS)
86
87struct cifs_acl {
88	__le16 revision; /* revision level */
89	__le16 size;
90	__le32 num_aces;
91} __attribute__((packed));
92
93struct cifs_ace {
94	__u8 type;
95	__u8 flags;
96	__le16 size;
97	__le32 access_req;
98	struct cifs_sid sid; /* ie UUID of user or group who gets these perms */
99} __attribute__((packed));
100
101#endif /* _CIFSACL_H */
102