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Linux/fs/cifs/cifsacl.h

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  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 
 68 struct 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 
 77 struct 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 
 87 struct cifs_acl {
 88         __le16 revision; /* revision level */
 89         __le16 size;
 90         __le32 num_aces;
 91 } __attribute__((packed));
 92 
 93 struct 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 

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