cifsacl.h

  1/* SPDX-License-Identifier: LGPL-2.1 */
  2/*
  3 *
  4 *   Copyright (c) International Business Machines  Corp., 2007
  5 *   Author(s): Steve French (sfrench@us.ibm.com)
  6 *
  7 */
  8
  9#ifndef _CIFSACL_H
 10#define _CIFSACL_H
 11
 12#include "../common/smbacl.h"
 13
 14#define READ_BIT        0x4
 15#define WRITE_BIT       0x2
 16#define EXEC_BIT        0x1
 17
 18#define ACL_OWNER_MASK 0700
 19#define ACL_GROUP_MASK 0070
 20#define ACL_EVERYONE_MASK 0007
 21
 22#define UBITSHIFT	6
 23#define GBITSHIFT	3
 24
 25/*
 26 * Security Descriptor length containing DACL with 3 ACEs (one each for
 27 * owner, group and world).
 28 */
 29#define DEFAULT_SEC_DESC_LEN (sizeof(struct smb_ntsd) + \
 30			      sizeof(struct smb_acl) + \
 31			      (sizeof(struct smb_ace) * 4))
 32
 33/*
 34 * The current SMB3 form of security descriptor is similar to what was used for
 35 * cifs (see above) but some fields are split, and fields in the struct below
 36 * matches names of fields to the spec, MS-DTYP (see sections 2.4.5 and
 37 * 2.4.6). Note that "CamelCase" fields are used in this struct in order to
 38 * match the MS-DTYP and MS-SMB2 specs which define the wire format.
 39 */
 40struct smb3_sd {
 41	__u8 Revision; /* revision level, MUST be one */
 42	__u8 Sbz1; /* only meaningful if 'RM' flag set below */
 43	__le16 Control;
 44	__le32 OffsetOwner;
 45	__le32 OffsetGroup;
 46	__le32 OffsetSacl;
 47	__le32 OffsetDacl;
 48} __packed;
 49
 50/* Meaning of 'Control' field flags */
 51#define ACL_CONTROL_SR	0x8000	/* Self relative */
 52#define ACL_CONTROL_RM	0x4000	/* Resource manager control bits */
 53#define ACL_CONTROL_PS	0x2000	/* SACL protected from inherits */
 54#define ACL_CONTROL_PD	0x1000	/* DACL protected from inherits */
 55#define ACL_CONTROL_SI	0x0800	/* SACL Auto-Inherited */
 56#define ACL_CONTROL_DI	0x0400	/* DACL Auto-Inherited */
 57#define ACL_CONTROL_SC	0x0200	/* SACL computed through inheritance */
 58#define ACL_CONTROL_DC	0x0100	/* DACL computed through inheritance */
 59#define ACL_CONTROL_SS	0x0080	/* Create server ACL */
 60#define ACL_CONTROL_DT	0x0040	/* DACL provided by trusted source */
 61#define ACL_CONTROL_SD	0x0020	/* SACL defaulted */
 62#define ACL_CONTROL_SP	0x0010	/* SACL is present on object */
 63#define ACL_CONTROL_DD	0x0008	/* DACL defaulted */
 64#define ACL_CONTROL_DP	0x0004	/* DACL is present on object */
 65#define ACL_CONTROL_GD	0x0002	/* Group was defaulted */
 66#define ACL_CONTROL_OD	0x0001	/* User was defaulted */
 67
 68/* Meaning of AclRevision flags */
 69#define ACL_REVISION	0x02 /* See section 2.4.4.1 of MS-DTYP */
 70#define ACL_REVISION_DS	0x04 /* Additional AceTypes allowed */
 71
 72struct smb3_acl {
 73	u8 AclRevision; /* revision level */
 74	u8 Sbz1; /* MBZ */
 75	__le16 AclSize;
 76	__le16 AceCount;
 77	__le16 Sbz2; /* MBZ */
 78} __packed;
 79
 80/*
 81 * Used to store the special 'NFS SIDs' used to persist the POSIX uid and gid
 82 * See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx
 83 */
 84struct owner_sid {
 85	u8 Revision;
 86	u8 NumAuth;
 87	u8 Authority[6];
 88	__le32 SubAuthorities[3];
 89} __packed;
 90
 91struct owner_group_sids {
 92	struct owner_sid owner;
 93	struct owner_sid group;
 94} __packed;
 95
 96/*
 97 * Minimum security identifier can be one for system defined Users
 98 * and Groups such as NULL SID and World or Built-in accounts such
 99 * as Administrator and Guest and consists of
100 * Revision + Num (Sub)Auths + Authority + Domain (one Subauthority)
101 */
102#define MIN_SID_LEN  (1 + 1 + 6 + 4) /* in bytes */
103
104/*
105 * Minimum security descriptor can be one without any SACL and DACL and can
106 * consist of revision, type, and two sids of minimum size for owner and group
107 */
108#define MIN_SEC_DESC_LEN  (sizeof(struct smb_ntsd) + (2 * MIN_SID_LEN))
109
110#endif /* _CIFSACL_H */