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 */